USABILITY FEATURES FOR RESPIRATORY HUMIDIFICATION
SYSTEM
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application claims the priority benefit of U.S.
Provisional Application Nos. 61/639,632, filed April 27, 2012, and 61/785,733, filed
March 14, 2013, the entirety of each of which is hereby incorporated by reference
herein.
BACKGROUND
Field of the Invention
[0002] The present disclosure generally relates to humidification systems
for humidifying gases supplied to users, and more particularly, to humidification
systems having features for improved assembly and usability.
Description of the Related Art
[0003] Many gas humidification systems deliver heated and humidified
gases for various medical procedures, including respiratory treatment, laparoscopy,
and the like. These systems can be configured to control temperature, humidity and
flow rates through the use of various sensors.
[0004] Various components of such systems also can include features
designed to help control the system and/or help provide users with gases having
desired characteristics. Such gas humidification systems can include many
components that must be assembled prior to use. The set-up process can be
complicated and time-consuming, and may require specialized training. The
specialized training may need to be repeated for each new employee or user. Thus,
there is a need for a system that is intuitive to assemble and use without extensive
training.
SUMMARY
[0005] A humidification system for delivering humidified gases to a user
can include a heater base, a humidification chamber having an inlet, outlet, and
associated liquid conduit, and a breathing circuit including a supply conduit,
inspiratory conduit, and optional expiratory conduit. A humidification system can
include various features as described herein to help make set-up less difficult and
time-consuming. Such features can also help make the set-up process more intuitive
for an operator, which can reduce the need for specialized training and reduce the
number of potential errors.
[0006] In some embodiments, the humidification chamber is packaged
with the inlet and outlet ports covered by a port cap. The port cap is designed to help
indicate to the operator that the port cap should be removed and discarded during set
up. In some embodiments, the liquid conduit, or feedset, is contained and concealed
by the port cap so that the feedset cannot be connected to a liquid source until the port
cap is removed.
[0007] In some embodiments the supply conduit, inspiratory conduit, and
optional expiratory conduit are coupled into a one-piece assembly to aid set-up. The
conduits can be coupled by, for example, a mesh sheath, clips, or any other
appropriate coupling mechanism. One or more of the conduits can be removably
coupled to the others. The expiratory conduit can include an electrical plug
configured to be connected to a socket on the heater base to power a heating element
within the conduit. In some embodiments, one or more of the conduits can include
integrated sensors and adaptor cables to connect the sensors to the heater base.
[0008] In some embodiments, various components of a humidification
system are color-coded and can have corresponding structures to indicate which
components should be connected to one another during set-up. The heater base
and/or consumables packaging can also include a schematic or step-by-step
instructions to help guide the operator through the set-up procedure.
[0009] For purposes of summarizing the disclosure and the advantages
achieved over the prior art, certain objects and advantages are described herein. Of
course, it is to be understood that not necessarily all such objects or advantages need
to be achieved in accordance with any particular embodiment. Thus, for example,
those skilled in the art will recognize that the disclosure may be embodied or carried
out in a manner that achieves or optimizes one advantage or group of advantages as
taught or suggested herein without necessarily achieving other objects or advantages
as may be taught or suggested herein. All of these embodiments are intended to be
within the scope of the disclosure herein. These and other embodiments will become
readily apparent to those skilled in the art from the following detailed description
having reference to the attached figures, the disclosure not being limited to any
particular disclosed embodiment(s).
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] These and other features, aspects and advantages of the present
disclosure will be described with reference to the following drawings, which are
illustrative but should not be limiting of the present disclosure.
[0011] FIG. 1 illustrates an example embodiment of a humidification
system;
[0012] FIG. 2A illustrates an example embodiment of a humidification
chamber installed on a heater base;
[0013] FIG. 2B illustrates an example embodiment of a humidification
chamber;
[0014] FIG. 3 illustrates an example embodiment of a heater base;
[0015] FIGS. 4A-4H illustrate example embodiments of a humidification
chamber as packaged;
[0016] FIG. 4 1 illustrates an example embodiment of a spike including a
sheath;
[0017] FIG. 4J illustrates the spike of FIG. 4 1 without the sheath;
[0018] FIG. 5A illustrates an example embodiment of a sensor cartridge
module and humidification chamber;
[0019] FIG. 5B illustrates an example embodiment of a sensor cartridge
module coupled to a heater base;
[0020] FIG. 5C illustrates an example embodiment of a sensor cartridge
module connected to a heater base with an electrical cable;
[0021] FIG. 6 illustrates an example embodiment of a humidification
chamber;
[0022] FIG. 7A illustrates an example embodiment of breathing conduits
as packaged;
[0023] FIG. 7B illustrates an example embodiment of a humidification
chamber with features to promote proper connections;
[0024] FIG. 8 illustrates example embodiments of conduits having
features corresponding to those shown in FIG. 7B;
[0025] FIG. 9A illustrates an example embodiment of a one-piece circuit;
and
[0026] FIG. 9B illustrates an example embodiment of a releasable
connection system for a one-piece circuit;
[0027] FIG. 10 illustrates a method for setting up a humidification system;
and
[0028] FIG. 11 illustrates an example embodiment of a heater base and
humidification chamber.
DETAILED DESCRIPTION
[0029] Although certain embodiments and examples are described below,
those of skill in the art will appreciate that the disclosure extends beyond the
specifically disclosed embodiments and/or uses and obvious modifications and
equivalents thereof. Thus, it is intended that the scope of the present disclosure
should not be limited by any particular embodiments described below.
[0030] An example embodiment of a humidification system 100 can
include a heater base 102, a humidification chamber 104, and a breathing circuit or
breathing circuit assembly, for example, as shown in Figure 1. In some
embodiments, the system 100 further comprises a gases supply 130, for example, a
ventilator or other suitable source of pressurized gases suitable for breathing or use in
medical procedures. The heater base 102 can include a heater plate 108 (better shown
in Figure 3). In addition, the heater base 102 can comprise one or more processors
114, and one or more memories or other suitable storage components. In some
embodiments, the heater base 102 also comprises a display that can provide
information to and/or receive input from an operator.
[0031] In some configurations, the display can have a schematic to
facilitate the operator making the desired connections, in some instances in a desired
order. For example, the display can have a static image with lights (e.g., LED) under
different regions that light in a sequence to encourage the desired connection order.
In some configurations, the image can be formed on membranes that are back-screen
printed behind a polyester or polycarbonate film with LEDs attached to or positioned
adjacent to the film. In some configurations, the lights may begin the sequence when
a switch is operated by insertion of a humidification chamber into the heater base or
the like. Such configurations resolve any need for an operator to turn on the heater
base to get the feedback on proper connection sequence. Other suitable arrangements
also can be used.
[0032] The humidification chamber 104 generally comprises an inlet 110
and an outlet 112 and is configured to be installed on the heater plate 108 of the
heater base 102. The humidification chamber 104 is further configured to hold a
volume of a liquid, such as water. The chamber 104 can include an opening or port
for the connection of a liquid conduit or feedset 118. The liquid conduit 118 can
extend from the chamber 104, as shown in Figure 2A. In some configurations, the
liquid conduit 118 can connect to a spike for a water bag. In some configurations, the
liquid conduit 118 can be integrally formed with or permanently coupled to the
chamber 104. The spike can be coupled to the liquid conduit 118 via an adhesive,
sonic welding, an interference fit, or any other suitable means. In some
embodiments, the spike includes a vent. If the spike is inserted into, for example, a
plastic, collapsible bag, the vent is plugged. However, if the spike is inserted into a
rigid container, such as a glass bottle, the vent is open and allows air to enter the
container to help reduce or prevent negative pressures in the container. The vent can
include a filter that is permeable to gases but impermeable to liquids.
[0033] In use, the liquid conduit 1 8 conveys a liquid, for example, water,
from a liquid source, such as a water bag, saline bag or the like, to the chamber 104.
The heater plate 108 heats the chamber 104 and causes at least some of the chamber
104 contents to evaporate. In some embodiments, the humidification chamber 104
can include features to help reduce the likelihood of the level of liquid in the chamber
104 from exceeding a particular level. For example, the chamber 104 can include one
or more floats 150 as shown in Figures 2B, 4A, and 4B. The floats rise and fall with
the level of liquid in the chamber 104. When the liquid level reaches a certain level,
the floats 150 obstruct or block the port that is connected to the liquid conduit 118 to
stop or slow further ingress of liquid into the chamber 104. Other similar features
also can be used. In a preferred embodiment, a plurality of floats 150 are used, each
float adapted to stop the further ingress of liquid into the chamber 104. To this end, a
second float provides a backup or safety mechanism, thereby further reducing the
likelihood of the chamber 104 overfilling. Figure 2B illustrates an example
embodiment of such a chamber 104 having a primary float 250a and a secondary float
250b.
[0034] With reference again to Figure 1, the breathing circuit assembly
can include a supply conduit 120, an inspiratory conduit 122, and, in some
configurations, an expiratory conduit 124. A gases supply end of the supply conduit
120 is configured to connect to an output 132 of the gases supply 130 and a chamber
end of the supply conduit 120 is configured to connect to the chamber inlet 110 of the
chamber 104. A chamber end of the inspiratory conduit 1 2 is configured to connect
to the chamber outlet 112 of the chamber 104, and a user end of the inspiratory
conduit 122 is configured to connect to the user 128 via an interface 126, for
example. A user end of the expiratory conduit 124 is configured to connect to the
interface 126, and a gases supply end of the expiratory conduit 124 is configured to
connect to a return 134 of the gases supply 130. The user ends of the inspiratory
conduit 1 2 and expiratory conduit 124 can be connected to the interface 126 via a Ypiece
127, for example but without limitation.
[0035] I use, gases flow from the gases supply 130 through the supply
conduit 120 and into the chamber 104 via the inlet 110. The gases are humidified
within the chamber 104 and exit the chamber 104 through the outlet 112. The user
inhales humidified gases supplied through the inspiratory conduit 122, and exhales
into the expiratory conduit 124. The inspiratory conduit 122 and/or expiratory
conduit 124 can include a heating element, for example, a heating wire, to help
maintain the gases at a desired temperature and to reduce the likelihood of significant
condensation formation in the conduits.
[0036] Before use, an operator, such as medical personnel, must correctly
connect the various components to set up the system 100. Because of the variety of
components and number of connections that must be made, set-up of the system 100
can be a complex process that requires special training to complete properly. The
humidification system 100 can include various features as described herein to
simplify the set-up process and reduce the likelihood of an incorrect set-up. In some
embodiments, certain usability features advantageously can help reduce the total
number of steps and time required during the set-up process. Some features
described herein also can help make set-up more intuitive for the user, which can
reduce the need for specialized in-service training.
[0037] To begin set-up, the operator installs the humidification chamber
104 on the heater base 102 by sliding the chamber 104 onto the heater base 102 under
a rim edge 106 (shown in Figure 3) that helps hold the chamber 104 in place. The
heater plate 108 can be spring loaded in some configurations such that the base of the
chamber 104 presses downward upon the heater plate 108 and a protruding portion
105 of the chamber 104 can be captured between the heater plate 108 and the rim
edge 106. Preferably, a guard 107 along a front portion of the rim edge 106 is
depressed to enable the lower portion of the chamber 104 to access the heater plate
108 and then the guard 107 reverts to a non-depressed position once the chamber 104
is installed. In some configurations, the forwardmost portions of the rim edge 106
(e.g., the portions of the rim edge 106 that define an opening for insertion of the
chamber 104) are configured with a raised or enlarged opening 109 that ramps
downward. The opening 109 preferably comprises a lower surface that is elevated
above an upper surface of the non-depressed guard 107. In such a manner, the
openings 109 provide a visual clue to the operator that the protruding portion 105 can
be inserted into the opening. Further insertion of the chamber 104 into the opening
causes the guard 107 to be depressed and facilitates full insertion of the chamber into
the heater base and can help guide the chamber 104 into place. Thus, the visual
details can indicate to the operator that the chamber 104 slides into place under the
rim edge 106. This can also help inform the operator that the guard 107 can be
depressed to later remove the chamber 104 from the heater base 102. Preferably, the
chamber 104 has details to depress the guard 107 when the operator attempts to
remove the chamber 104 from the heater base 102. Moreover, by providing an
uneven upper surface to the rim edge 106, the operator is less likely to believe that the
chamber 104 should be placed atop the rim edge 106, resulting in poor thermal
conductivity, because such a placement will lead to an uneven chamber 104.
[0038] Humidification chambers, such as the chamber 104, often have a
generally rounded shape with generally smooth sides, which can make it difficult for
the operator to hold the chamber 104 during set-up and installation. In setting up the
humidifier, the chamber 104 will be grasped and then slid into position on the heater
base 102, as described above. Therefore, as shown in Figure 4D, the chamber 104
can include grips 168 to advantageously allow the operator to hold the chamber 104
more easily during installation. In some embodiments, for example as illustrated in
Figure 4D, the grips 168 are positioned at particular locations on the chamber 104 to
help guide the operator to correctly orient the chamber 104 when sliding the chamber
104 onto the base 102. In some embodiments, the grips 168 extend partially or
completely around the chamber 104. The grips 168 can include one or more of, for
example, depressions or cavities on the chamber 104 surface, vertical fins, a textured
surface, and/or a handle. In the illustrated configuration, a sidewall of the chamber
includes recesses that extend inwardly toward the chamber. The recesses can include
ribs or the like to enhance the ability of a user to grip the chamber by the recesses.
The recesses can be positioned along a forward facing surface. In some
configurations, the upwardly extending ports of the humidifier chamber can include
openings that face rearward while the recesses are concave into the humidifier
chamber and facing forward. The forward facing grips help orient the chamber for
installation. In some configurations, the recesses extend only partially up the full
height of the chamber. In some configurations, the recesses are opposed to each other
such that a gripping force can be applied with fingers and thumb by the user.
[0039] With reference to Figure 4A, the humidification chamber 104 can
be packaged with port caps 160 covering the inlet 110 and the outlet 112. The port
caps can seal or generally enclose the chamber 104 during shipping and storage. The
port caps 160 can include legs 162 that extend into the inlet 10 and the outlet 112
and that restrain the float 150 in position for shipping. In some configurations, the
liquid conduit 118 can be wound around, and can be contained by, a winder 166
provided on the chamber 104. During set-up, after the humidification chamber 104 is
installed on the heater base 102, the port caps 160 can be removed, preferably prior to
the liquid conduit 18 being unwound and connected to the liquid source via a spike
164. Once the spike 164 connects to the liquid source, liquid will begin filling the
chamber 104. However, if the liquid conduit 118 is connected to the liquid source
before the port caps 160 are removed, there is a risk of the chamber 104 over- filling
because the float 150 is still restrained and cannot function to slow or stop the flow of
liquid into the chamber 104.
[0040] To reduce the likelihood of overfilling, in some embodiments, the
chamber 104 is packaged with the liquid conduit 118 captured between the inlet port
110 and the outlet port 12 of the chamber 104 and the port caps 160. The liquid
conduit 118 can further be somewhat obscured from the operator until the port caps
60 have been removed. Preferably, however, the presence of the liquid conduit 118
below the port caps 160 can be viewed with the port caps 160 in position, which leads
the operator to remove the port caps 160 to access the liquid conduit 118.
Furthermore, removal of the port caps 160 preferably results in the unwinding or
unfurling of the liquid conduit 118. This packaging arrangement also reduces or
eliminates any need for a winder 166 to contain the liquid conduit 18 and the set-up
steps of removing the winder 166 from the chamber 104 and unwinding the liquid
conduit 118 from the winder 166. In some embodiments, the spike 164 and/or liquid
conduit 118 are free-floating and not constrained by a winder 166 or the port caps
160. This can help reduce possible operator confusion as to whether the liquid
conduit 118 should be unwound during set-up. In some arrangements, the spike 164
freely hangs exposed to further encourage removal of the port caps 160. In some
configurations, the spike 164 is partially exposed and partially captured by the port
caps 160 which encourage removal of the port caps 160 to access the spike 164.
[0041] Additional features can help reduce the likelihood of operators
mistaking the port caps for operational components of the system intended to remain
in place during use. For example, an alternate port cap 170 can include a single flat
surface spanning the top of both ports and simple side faces encircling the ports and,
optionally, the liquid conduit 118 as shown in Figures 4B and 4C. This design can
give the port cap 170 the appearance of a lid to be removed from the chamber 104
before use. The port cap 170 can also include a lip detail around some or all of a
perimeter of the flat top surface that the operator can grip for removal. The flat top
surface provides a surface for an optional instruction label or a label having an image
of, for example, a trash can to indicate to the operator that the port cap 170 is
supposed to be removed and discarded. In some configurations, the port caps can be
formed of a material or have a coloration that will confirm an instinct to dispose of
the port caps.
[0042] With reference to Figure 4D, another example embodiment of a
port cap 170 that can be used with a winder 166 includes a cap body 172 and a float
retainer 174 having a tab or pull loop 176 and legs 162 that extend into the inlet 110
and the outlet 112 to restrain the float 150. The cap body 172 can be formed to be at
least partially translucent or substantially transparent to reveal the conduit contained
within the cap body 172. The cap body 172 can include an arrow and/or other visual
or other indicators to direct the operator on the correct direction for insertion of the
chamber 104 on the heater base 102. In some embodiments, the cap body 172 can
include a label that includes instructions for set-up of the chamber to increase the
likelihood of a correct or desired sequence of set-up steps being followed by people
performing set-up operations. In some embodiments, the float retainer 174 is
separate from the cap body 172 and can be removed from the chamber 104 before the
cap body 172 as shown in Figure 4E. Removal of the cap body 172 exposes the
winder 166, as shown in Figure 4F. Alternatively, the float retainer 174 can be
integrally molded with or coupled to the cap body 172 so that both components are
removed simultaneously, for example, by pulling on the pull loop 176. Both
embodiments advantageously ensure that the float retainer 174 is removed when the
winder 166 is exposed so that the float 150 is unrestrained before the liquid conduit
118 is connected to the liquid source. In some embodiments, the winder 166 is
coupled to the chamber 104 with clips or other features that connect to, clip to or
otherwise engage the chamber ports. As shown in Figure 4F, the liquid conduit 118
can extend from a liquid inlet 117 in the chamber 104, around the winder 166, and
into the winder 166 through a vent 167 to couple to the spike 164, which can be
seated within the winder 166 as shown in the illustrated embodiment. In the
illustrated embodiment, the cap body 172 is sized and shaped to also cover the liquid
conduit 118 when in place for shipping and/or storage. In some configurations, the
winder 166 includes features to secure the spike in a horizontal position (e.g., a
shipping position) and in a non-horizontal or vertical position (e.g., a testing
position). For example, the winder 166 can have a generally oval shape and can
include a longitudinal receptacle 186 within the winder 166 configured to receive
and/or to secure the spike in a horizontal shipping position. The winder 166 can also
include a generally circular receptacle 188 configured to receive a grip portion 190 of
the spike 164 (shown in Figure 4J) so that the spike 164 can be placed in a generally
vertical position for testing. The liquid conduit 118 can be secured in the liquid inlet
117 with an adhesive such as glue or any other suitable technique. A tubing holder
119 can help secure the liquid conduit 118 to a portion of the winder 166 or to the top
of the chamber 104 and help route the liquid conduit 118 from the liquid inlet 117 to
the winder 166. In some embodiments, the operator can remove the spike 164 from
the winder 166 and unwind the liquid conduit 118 from the winder 166 to connect the
spike 164 to the liquid source. In some embodiments, the operator can remove the
winder 166 from the chamber 104 and discard the winder 166 after unwinding the
liquid conduit 118.
[0043] Additional embodiments of liquid conduit 118 packaging are
shown in Figures 4G and 4H. In both illustrated embodiments, the liquid conduit 118
is wound into a looped configuration, for example, by winding the liquid conduit 118
around a jig. In some embodiments, a label 218 is attached to the liquid conduit
before winding and used to secure the liquid conduit 118 in the looped configuration.
In the embodiment of Figure 4G, the looped liquid conduit 118 is placed within a
foldable card 178 coupled to the top of the chamber 104. The card 178 can be made
of cardboard, plastic, a flexible material, or any other suitable material, and a bottom
portion 178a can be secured to the chamber 104 with an adhesive and/or by cutouts
280 configured to be placed around the chamber inlet and outlet ports. A top portion
178b of the card 178 can be folded over the bottom portion and secured with cutouts
configured to be placed around the chamber inlet and outlet ports and/or with port
caps 160. In some embodiments, the spike 164 is secured to a base of the card 178
between the top and bottom portions via a slot or clip. The bottom portion 178a of
the card can include a slit 282 to accommodate the liquid conduit 118 extending
between the card 178 and the liquid inlet 117. In some configurations, the looped
conduit can be placed width-wise on the card. In the embodiment shown in Figure
4H, the looped liquid conduit 118 is placed in a molded cavity 111 on the top of the
chamber 104 and protected by a tube enclosure 179, which can include port caps 160.
A bottom surface of the tube enclosure 179 can include a feature to secure the spike
164. In some embodiments, a label with branding, instructions, and/or other
information can be attached to the tube enclosure 179, the card 178 (e.g., the top
portion 178b or the card 178). In other words, in some configurations, one or more of
the card (e.g., the top portion 178b of the card 178) and the tube enclosure 179 can
incorporate one or more surfaces that can be used for instructions (e.g., unpacking
instructions, set-up instructions or the like), labels or warnings. In some
configurations, the card 178 can include sequential instructions that increases the
likelihood of a correct or desired sequence of set-up steps being followed by people
performing set-up operations. For example, the card 178 can be provided with
sequential or staggered steps to follow. In some configurations, the card 178 or
another component can explain only steps that involve exposed or accessible
components.
[0044] As shown in Figures 4F and 41, the spike 164 can be packaged
with a spike cap or sheath 165 that the operator removes before use, as shown in
Figure 4J. The sheath 165 can include a tab or a similar feature for easier removal of
the spike 164 from the winder 166 and/or of the sheath 165 from the spike 164. In
some configurations, the cap is not connected to any other member such that the
operator knows to remove the cap. Labels also can be used to instruct the operator on
how to set up the liquid conduit 118 and liquid source. Typically, humidification
systems 100 utilize water to humidify gases passing through the humidification
chamber 104. To indicate to the operator that the spike should be connected to a
water bag rather to another type of liquid, such as saline, the liquid conduit 118
and/or the chamber 104 can include labels, e.g., reading "H20." Preferably, any such
visual indicator, including the label, is positioned closer to the spike than to the body
of the chamber when the conduit is stretched outward. The label on the liquid
conduit 118 can also help draw the operator's attention to the water spike 164, which
may not be obvious to the operator when concealed by the spike cap. The chamber
104 can also include labels to indicate the appropriate water level.
[0045] In some configurations, a spike can be secured to tubing using any
suitable technique. For example, in some configurations, the spike can be secured to
the tubing using adhesives, sonic welding, interference fit or the like. A label then
can be attached to the tubing. In some configurations, the label can be loosely looped
over the tubing and can include a sticky end (e.g., exposed adhesive). In some
configurations, the label can be positioned closer to the spike than to another end of
the tubing. The tubing can be wound around a jig or the like and secured in a looped
configuration using the label (e.g., using the sticky end to tack the end of the label to
another portion of the label). When winding the tubing, the ends preferably are
provided with enough slack to connect the tubing and spike to the chamber. The end
without the spike can be secured to the chamber using any suitable technique. In
some configurations, the end without the spike can be inserted into a water inlet hole
of the water chamber and fixed with glue or the like. The ends of the loop of tubing
can be placed over or between the inlet and outlet ports of the chamber. The spike
can be secured into a receptacle. In some configurations, the receptacle can be
formed in, or secured to, a portion of the chamber. In some configurations, the spike
is secured to the chamber with the point extending away from the chamber for testing.
Testing can be conducted on the assembled chamber. After testing, the spike can be
removed from the chamber and the spike and tubing can be secured in any suitable
manner for shipping, including those set forth above.
[0046] The humidification system 100 can include reusable temperature
and/or flow probes at or near the humidification chamber 104. For example, a flow
sensor can be positioned in the chamber inlet 110 to sense the flow rate of the gases
entering the chamber 104 from the gases supply 130. A temperature sensor can be
positioned in the chamber inlet 110 to sense the temperature of the gases entering the
chamber 104 from the gases supply 130. A temperature sensor can be positioned in
the chamber outlet 112 to sense the temperature of the humidified gases leaving the
chamber 104. A flow sensor can also or alternatively be positioned in the chamber
outlet 112 to sense the flow rate of gases leaving the chamber 104 to be delivered to
the user.
[0047] In some embodiments, reusable temperature and/or flow sensor
probes 206 can be integrated into a sensor cartridge module 200, as shown in Figure
5B. Figure 5C shows the sensor cartridge module 200 connected to the heater base
with an electrical cable. The sensor cartridge module 200 in Figure 5B, however, is
mechanically and electrically connected to the heater base 102 via a spine 210 and
can therefore provide for the transfer of power to the sensors while also providing a
mounting location for the sensors, for example but without limitation. In some
configurations, the spine 210 and the port cap can have an interfacing configuration
such that movement of the chamber with the port cap in position toward the spine
during mounting of the chamber to the heater base will cause the spine to lift the port
cap from the chamber. Such a configuration increases the likelihood of the operator
removing the port cap from the chamber. Other suitable configurations also can be
used.
[0048] The sensor cartridge module 200 also allows for the transfer of
data between the sensors and the processor 114 in the heater base 102. The chamber
inlet 10 and outlet 112 can have apertures 140, 142 therethrough, for example as
shown in Figure 6. Probe membranes or grommets 144 sized and shaped to receive
the temperature and/or flow probes 204, 206 can be positioned within and
pneumatically seal the apertures 140, 142. In the configuration of Figure 5B, the
operator is encouraged to position the chamber base below the rim edge 106 because
otherwise the probes attached to the spine will not properly align with the respective
apertures.
[0049] Correct insertion of the chamber 104 into the heater base 102 can
automatically position the sensor probes 206 within the apertures 140, 142 of the
chamber inlet 110 and outlet 112. This can advantageously allow for an easier set-up
compared to separate reusable sensors, which must be manually inserted and
electrically connected to the heater base 102, and reduce the possibility of improper
electrical connection, improper pneumatic sealing and/or assembly. The probe
membranes 144 protect the probes from direct contact with the gases passing into and
out of the chamber 104. The probes therefore can be reused without requiring
cleaning and storage of the probes 206 and disconnection and reconnection of wires
between uses.
[0050] To help guide the operator through installation of the chamber 104
on the heater base 102 and proper connection with the sensor cartridge module 200,
the chamber 104 and sensor cartridge module 200 can include lead-in features, such
as corresponding male and female connections. For example, one or more of the base
102 and the cartridge module 200 can include structures that mate with structures 201
on the chamber 104. In the configuration of the chamber 104 shown in Figure 4F, the
structures 201 are recessed portions. Thus, the chamber 104 can have a shorter
vertical height on the portion closest to the housing of the heater base 102 when
mounted while the chamber 104 has a taller vertical height on the portion that is
positioned away from the cartridge module 200. Such a configuration reduces the
likelihood of the chamber being inserted into the base 102 backwards, which can
result in damage to the sensors. Thus, the cooperating formations greatly increase the
likelihood that coupling of the chamber 104 to the base 102 is only achieved in a
correct rotational orientation of the chamber 104. Moreover, the cooperating
structures can provide visual cues to the proper rotational orientation of the chamber
104. The cooperating structures can be a male on the base and a female on the
chamber, a female on the base and a male on the chamber, or any combination of
male and female portions on the base and the chamber.
[0051] By way of another example, the sensor cartridge module 200 can
include a central male projection 202 configured to slide into a female recess 204 in
the chamber 104. Alternatively, the chamber 104 can include a male projection
configured to slide into a center of the sensor cartridge module 200. Preferably, the
female recess 204 is configured in such a manner that only one orientation of the
chamber relative to the male projection 202 is possible. Any other configuration or
snap together assembly can be used. In some configurations, the chamber 104 can
include a chamfered or angled edge or protrusion 205 on the lateral sides, for
example, but without limitation. These protrusions 205 can cooperate with a
structure of the base 102 or on the cartridge module 200. The cooperation preferably
helps to pull or encourage the chamber 104 into a fully seated position relative to the
base 102. Thus, the protrusions 205 and the cooperating structures provide another
example of structures that can orient and properly position the sensor probes 206
relative to the chamber. These means for orienting the chamber relative to the heater
base also advantageously aid proper positioning of the sensor probes 206 within the
chamber ports. Advantageously, when the chamber 104 docks on the sensor cartridge
module 200, the sensor probes can be automatically inserted into the chamber ports to
the appropriate distance or depth. In other words, the risk of the probes 206 not fully
inserting to the ports of the chamber 104 can be reduced or eliminated. Preferably,
the connection between the sensor cartridge module 200 and the chamber 104 is
generally horizontally (e.g., parallel with an upper surface of the heater plate).
[0052] In some configurations, the chamber can have recess that
accommodates a protrusion from the spine or other portion of the heater base. Such a
configuration can help guide the chamber into position on the heater base in a desired
rotational orientation. In some configurations, rather than being translated into
position, the chamber can be rotated into position on the heater base. For example,
slots can be provided with posts that can slide vertically downward into the slots such
that rotation of the chamber will position the posts under the rim edge 106. In some
configurations, if the sensor cartridge module 200 is mounted to the chamber before
the chamber is mounted to the heater base, rotation of the chamber can establish an
electrical connection between components mounted to the chamber (e.g., sensors) and
the heater base. Rotation of the chamber also defines a horizontal connection
direction. Other configurations also are possible.
[0053] Some humidification systems 100 also include temperature and/or
flow rate sensors at various locations in the breathing circuit to monitor conditions of
the gases as they travel through the system 100 to and from the user 128. Some such
systems include reusable temperature sensors at or near a user end of the inspiratory
conduit 122 to ensure the gases reaching the user 128 are at an appropriate
temperature. Because the various conduits of the circuit are typically disposable,
reusable temperature sensors must be separately coupled to the inspiratory conduit
1 2 during set-up and must further be connected to the heater base 102 for power and
data transfer. The user may forget to connect the sensor and/or sensor cable entirely,
or may inadvertently fail to fully insert the sensor into the inspiratory conduit 122,
which can skew the sensor data. According to some embodiments of the present
disclosure, a single-use user end temperature sensor and associated sensor cable can
be integrated with the inspiratory conduit 122. This can advantageously eliminate the
steps of connecting a separate sensor and sensor wires during set-up, as well as the
steps and time required to clean and store reusable sensors.
[0054] In some embodiments, the sensor cartridge module 200 can allow
for power and data transfer between the heater base 102 and the inspiratory conduit
122 user end temperature sensor and an inspiratory conduit 122 heater wire. The
inspiratory conduit 122 chamber end connector can include an electrical connection
for coupling to a corresponding connection on the sensor cartridge module 200. This
provides a simpler alternative to using a reusable sensor cable to provide an electrical
connection between the user end temperature sensor and the heater base 102 and a
reusable heater wire adapter cable to provide an electrical connection between the
inspiratory conduit 122 heater wire and heater base 102. The user end temperature
sensor and heater wire can be coupled to the electrical connection of the inspiratory
conduit 122 chamber end connector via wires that are integrated in or run alongside
the exterior of the inspiratory conduit 122.
[0055] If the expiratory conduit 124 includes a heating element, e.g., a
heater wire, the heating element is typically powered via an electrical cable
connecting the heating element to the heater base 102. To help simplify set-up, both
ends of the heating element electrical cable can have plugs of the same design.
Corresponding sockets can be located on the heater base 102 and the expiratory
conduit 124 gases supply end connector. Either end of the heating element electrical
cable can be coupled to either the expiratory conduit 124 gases supply end connector
socket or socket of the heater base 102. The operator therefore does not need to
spend excess time determining the correct orientation for the heating element
electrical cable.
[0056] As explained herein, the breathing circuit can include multiple
conduits requiring multiple connections to the chamber 104, user 128, and/or gases
supply 130. The length of the conduits can make them difficult to handle and control
during set-up, increasing the risk of the conduits being accidentally dropped on the
ground and possibly contaminated. To improve handling and control during removal
from packaging and set-up, the circuits can be packaged and held together in a looped
configuration with a circuit sleeve 260 as shown in Figure 7A. In some
embodiments, the sleeved conduits can be packaged in a protective plastic bag or the
like. In some embodiments, the circuit sleeve 260 is made of cardboard or a thin
plastic sheet, although other materials are also possible. The circuit sleeve 260 can be
looped or wrapped around the conduits and closed or held together with, for example,
staples, tape, and/or an adhesive, e.g., glue. In some embodiments, ends of the sleeve
260 have interlocking features to close the sleeve 260 around the conduits, for
example, interlocking slits or a tab and corresponding slot. The conduits can also be
held in a looped configuration by tape, rubber bands, straps, or the like.
[0057] The looped configuration can advantageously allow the operator to
hang the conduits on, for example, the forearm, the heater base, or another object to
free up the operator's hands for other set-up tasks. In some embodiments, the circuit
sleeve 260 includes a hole 262 that can be used to hang the looped conduits on a
hook, for example, a hook used to hang the water bag or an I.V. bag, as an alternative
to placing the conduits on other hospital surfaces that can increase the risk of
contamination. The circuit sleeve 260 can be positioned on the conduits to conceal
selected conduit connectors and help direct the operator's attention to visible conduit
connectors, which can be the connectors that should be connected first during the set¬
up process. If the operator makes the appropriate connections with the visible
conduit connectors before removing the circuit sleeve 260 to expose the remaining
connectors, the operator will have a reduced number of possible connections, thereby
making it easier and more likely to correctly complete the set-up. In some
embodiments, the circuit sleeve 260 can include set-up instructions, in writing and/or
pictures, to help direct a preferred set-up sequence to achieve the correct set-up. The
circuit sleeve 260 can also be positioned on the conduits to cover and/or isolate any
sharp edges or corners (e.g., portions of the connectors) to help reduce the possibility
of damage to, for example, other circuit components, the chamber, and/or the
packaging material during shipping or the like.
[0058] To help reduce the likelihood of incorrect connections during set
up, the conduit connectors, chamber inlet 110 and outlet 112, gases supply output 132
and input 134, interfaces 128, and/or Y-piece 127 can have varying diameters to help
prevent incorrect connections from being made. In some embodiments, some or all
of the connections can include details, such as rib details, that allow the appropriate
components to be connected, but inhibit improper connections. For example, the
chamber outlet 112 or inspiratory conduit port can include a rib detail 250
circumferentially surrounding the port 112 as shown in Figure 7B. The inspiratory
conduit chamber connector can include a corresponding rib detail 254 configured to
engage the chamber outlet port rib detail 250 as shown in Figure 8. The chamber
inlet or supply conduit port can similarly include a circumferential rib detail 252 to
engage a corresponding rib detail 256 on the supply conduit chamber connector.
Other components, such as an inspiratory tube user end connector, expiratory tube
user end connector, expiratory tube gases supply end connector, and/or supply
conduit gases supply end connector can include outwardly extending rib details. In
some configurations, different diameters can be used to make it difficult if not
impossible to physically connect the wrong conduit to the wrong port. In addition, as
described above, it is possible to form each end of each hose to have a unique
configuration to help reinforce the desired connections. Other configurations are also
possible.
[0059] In some embodiments, various components can be color coded to
help guide the operator through the set-up process and help reduce the likelihood of
incorrect connections. For example, the supply conduit 120 chamber end connector
and chamber 104 inlet 110 port can be similarly colored to a first color, for example,
green, to indicate to the operator that those two components are intended to be
connected. Similarly, the inspiratory conduit chamber end connector and chamber
outlet port can be color-coordinated to a second color, for example, blue. For a duallimb
circuit, the interface 126 and/or Y-piece 127 can be color-coordinated to a third
color, for example, grey. For a single-limb circuit, the interface and the inspiratory
conduit patient-end connector can be color-coordinated to a fourth color, for example,
blue. The sensor cartridge module 200 temperature and flow probes 206 can be
color-coordinated with probe membranes 144, for example turquoise. An adapter
cable and plugs for the expiratory conduit heating element can be color-coordinated
with sockets on the expiratory conduit gases supply end connector and heater base
102, for example, yellow. The components intended to be discarded during set-up,
for example, the port caps 160, 170, winder 166, a Y-piece cap, and/or a cap for the
water spike 164 can be colored similarly, for example, semi-transparent yellow or
orange. Preferably, the cap for the water spike 164 is transparent, translucent or
otherwise configured with slots, gaps, holes or the like to indicate to the operator that
the spike is positioned within the cap. The supply conduit gases supply end
connector and expiratory conduit gases supply end connector can be color-coded, for
example, pink. In some embodiments, the conduits themselves can be differentiated
through color. For example, the supply conduit 120 can be green, the inspiratory
conduit 122 can be blue, and the expiratory conduit 124 can be white. In some
embodiments, colors may be selected so that operators with reduced color recognition
(such as red-green color blindness) are still able to differentiate the different
components. In some arrangements, where an order is preferred, the color coding to
be that over color mixing (e.g., red for first connections, orange for second
connections, yellow for third connections, green for fourth connections and blue for
fifth connections, for example but without limitation). Thus, patterns can be used to
encourage proper progression as well as proper connections. In such configurations,
LED, lights or color filters over lights can be used to show the color of the
connections on the electric display or the colors can simply be shown on a display
screen. Of course, other configurations and color palettes are also possible. In some
embodiments, user instructions and/or errors can refer to the different components by
their color.
[0060] In addition to or instead of color-coordinating the various
components, the components can include corresponding symbols and/or text to
indicate parts intended to be connected together. In some configurations, the first
connections can be labeled "1" or "A" with the second connections being labeled "2"
or "B," by way of example. In some embodiments, one or more of the conduits can
include labeling indicating the proper direction of gas flow through the conduit in
use. For example, the supply conduit 120 can include one or more arrows and,
optionally, text similar to "TO HUMIDIFIER," pointing from the gases supply 130
end to the chamber 104 end. Similarly, the inspiratory conduit 122 can include
arrows and optional text (e.g., "TO PATIENT") pointing from the chamber end to the
user end, and the expiratory conduit 124 can include arrows and optional text (e.g.,
"FROM PATIENT") pointing from the user end to the gases supply end. Any
suitable combinations or selection of shapes, colors, sizing, and/or symbols can be
used to help a user make the desired connections and/or make the desired connections
in the desired order. Further, in some embodiments, connectors of different
components may be configured not to be able to connect to one another. For example
but without limitation, the inspiratory conduit can have a connector that connects to
only the outlet of the humidifier. In such embodiments, the connectors would reduce
the likelihood of improperly connecting the component because the components
would be very difficult, if not impossible, to connect incorrectly.
[0061] To further simplify set-up of the breathing circuit, in some
embodiments, the supply 120, inspiratory 122, and, optionally, expiratory 124
conduits can be coupled into a one-piece circuit, for example as shown in Figure 9A.
In some embodiments, the user ends of the inspiratory 122 and expiratory 124
conduits can be coupled to a Y-piece 127 configured to be coupled to the interface
126 in use. The Y-piece 127 can be packaged with a disposable cap 180 covering the
user end to help inhibit contamination of the conduits and connections during set-up.
The electrical connectors and cables for temperature and flow sensors and heating
elements can also be integrated into the one-piece circuit. In some embodiments, the
chamber 104 can be provided pre-coupled with the one-piece circuit as well.
[0062] The conduits can be joined together or coupled via, for example, a
mesh-type wrap or sheath surrounding at least some portion of the conduits. In some
configurations, multiple portions of the conduits to be joined to form a multiple
lumen structure can be joined with separate connecting means, including but not
limited to mesh-type wrap, sheaths, belts, connectors, clips or the like. In some
embodiments, the supply conduit 120 and inspiratory conduit 122 can be removably
coupled to the expiratory conduit 124 with individual clips. This can advantageously
allow for the expiratory conduit 124 to be undipped from the supply 120 and
inspiratory 122 conduits and removed from the circuit when not needed.
[0063] In some embodiments, two or more of the conduits are structured
to releasably connect together. In some embodiments, all of the conduits are
structured to releasably connect together. A first conduit (e.g., the inspiratory
conduit) can comprise a first portion of one of a hook material or a loop material and
a second conduit (e.g., the expiratory conduit) can comprise a second portion of the
other of a hook material or a loop material. The first and second portions can be
configured to releasably connect together in a hook-and-loop arrangement. Other
releasable connection systems can additionally or alternatively be used, such as a
series of magnets whereby the two portions include magnets of opposite polarity, for
example but without limitation. In another configuration, the outer wall of the
inspiratory conduit and the outer wall of the expiratory conduit can be corrugated
such that the peaks and troughs of the corrugation are mushroom-shaped. In such a
configuration, the peaks of one conduit are configured to releasably snap-fit into the
troughs of the other conduit such as shown in Figure 9B, for example but without
limitation. In such a configuration, the conduits may be directly connected to one
another. The size and shape of the peaks and troughs can be the same on both
conduits or can be complementary to reduce or eliminate the likelihood of, for
example but without limitation, two expiratory conduits connecting together.
[0064] The one-piece circuit advantageously reduces the number of
connections required during set-up and reduces the possibility of incorrect assembly.
Additionally, during set-up of traditional systems, the various components may be
placed on a table or bed to allow for sorting and identification. Components can be
misplaced or fall to the floor, thereby risking damage and/or contamination. The onepiece
circuit advantageously helps reduce these problems. The one-piece circuit with
integrated electrical connectors and cables also allows for the various electrical
connections to be made during set-up with the components to be connected being
positioned in close proximity to each other. In some embodiments, the expiratory
conduit heating element connector plug 182 can be located along the length of the
expiratory conduit 124 rather than at the gases supply 130 connector. The plug 182
can be positioned and configured to be connected to a socket on the sensor cartridge
module 200 or elsewhere on the heater base 102, for example, on the front of the
heater base 102 to improve visibility of and access to the socket. In such
embodiments, the plug 182 may be automatically connected to sensor cartridge
module 200 when the expiratory conduit 124 and/or the chamber 104 is connected to
the heater base 102.
[0065] Various features can help improve the ergonomics of the
humidification system 100. For example, the socket on the expiratory conduit gases
supply end connector can be oriented at, for example, about a 45° angle from a plane
defined by the end of the conduit. The angle can enhance the visibility of the socket
when the expiratory conduit 124 is connected to either horizontally or vertically
oriented gases supply 130 ports. The angle can also help reduce the likelihood that
the socket will be obstructed by other components or equipment making set-up more
difficult. The heater base 102 socket can be located on a front face of the heater base
102 to enhance visibility and ease of access as compared to placement of the socket
on, for example, a side of the heater base 102 or elsewhere.
[0066] In some embodiments, the expiratory conduit 124 gases supply
130 end connector and/or the supply conduit 120 gases supply 130 end connector can
have an elbow shape. For example, the connectors can have an angle of about 120°.
The elbow shape can advantageously allow the operator to position the direction of
the expiratory 124 and/or supply 120 conduits to and from the gases supply 130 so
that the conduits do not obstruct other system components, such as the heater base
102 display. Any or all of the connectors, such as one or more of the expiratory
conduit 124 and supply conduit 120 gases supply 130 end connectors and the
inspiratory conduit 122 and expiratory conduit 124 user end connectors can include
grip details to help the operator more easily grip the connectors and perform a
twisting motion for inserting and removing medical taper connectors. The grip
details can be especially beneficial for operators wearing surgical gloves.
[0067] In some embodiments, the heater base display 103 can be located
on an upper surface of the spine 210, for example as shown in Figure 11, for easier
viewing. In the illustrated embodiment, the upper surface of the spine 210 and
therefore the display 103 are oriented at an angle. The angled orientation can
advantageously allow for an improved or easier view of the display 103 for the
operator, particularly, for example, if the heater base 102 is positioned below the
operator's horizontal line of sight. In some embodiments, the upper surface and/or
display 103 can be oriented at an angle of about 22° from vertical, although other
angles are also possible. In some embodiments, one or both of the supply conduit
and inspiratory conduit chamber end connectors can have an angled or elbow shape.
For example, in the embodiment of Figure 11, the supply conduit chamber end
connector 257 has an elbow shape so that it can be angled away from the heater base
102. The angled or elbow configuration can advantageously inhibit or prevent the
connector and/or conduit from substantially obscuring the display 103, which serves
to improve display visibility. In some embodiments, one or both of the supply and
inspiratory conduit chamber end connectors can have an angle of about 112° so that
the connector extends from the chamber port at an angle of about 22° above
horizontal when coupled to the port, although other angles are also possible. In some
embodiments, the spine 210, display 103, and/or one or both chamber end connectors
can be configured so that the connector(s) is below the display 103 and/or a bottom
edge of the upper surface of the spine 210, e.g., the connector(s) extends below a line
extending from the bottom edge of the display 103 perpendicular to the plane of the
display and/or below a line extending from the bottom edge of the upper surface of
the spine 210 perpendicular to the plane of the upper surface.
[0068] Additional features can assist the operator with the overall set-up
process. For example, packaging for the consumable components of the system 100
can include a schematic diagram illustrating the set-up procedure and/or step-by-step
instructions. Figure 10 illustrates a sequential method for setting up a humidification
system 100. The method can include some or all of: installing the chamber 104 on
the heater base 102, removing the port cap(s) 160, 170, removing the spike 164 from
the winder 166, unwinding the liquid conduit 118 and removing the winder 166 from
the chamber 104, coupling the spike 164 to a liquid source, coupling the supply
conduit 120 to the chamber inlet 110, coupling the supply conduit 120 to the gases
supply 130, coupling the inspiratory conduit 122 to the chamber outlet 112, and
coupling the inspiratory conduit 122 to the Y-piece 127 or interface 126. The method
can further include coupling the expiratory conduit 124 to the interface 126 or Ypiece
127 and gases supply 130.
[0069] Although this disclosure has been described in the context of
certain embodiments and examples, it will be understood by those skilled in the art
that the disclosure extends beyond the specifically disclosed embodiments to other
alternative embodiments and/or uses and obvious modifications and equivalents
thereof. While the description above refers to a "user," it should be noted that the
ultimate user can be a patient and the apparatus described herein can be assembled by
a nurse, doctor or other healthcare practitioner in a clinical or healthcare related
facility as well as a user/patient in a home use, for example but without limitation. In
addition, while several variations of the embodiments of the disclosure have been
shown and described in detail, other modifications, which are within the scope of this
disclosure, will be readily apparent to those of skill in the art. It is also contemplated
that various combinations or sub-combinations of the specific features and aspects of
the embodiments may be made and still fall within the scope of the disclosure. It
should be understood that various features and aspects of the disclosed embodiments
can be combined with, or substituted for, one another in order to form varying modes
of the embodiments of the disclosure. Furthermore, dimensions of various
components provided herein are exemplary, and other dimensions may be used.
Thus, it is intended that the scope of the disclosure herein should not be limited by
the particular embodiments described above.
WHAT IS CLAIMED IS:
1. A humidification apparatus comprising:
a heater base comprising first and second sensors, the first and second sensors being
positioned vertically higher than a heater plate, the heater plate being configured to
support a humidification chamber;
the humidification chamber configured to hold a volume of liquid and comprising:
at least one side wall;
a top wall connected to the at least one side wall;
a cavity being at least partially defined by the at least one side wall and the top wall;
a liquid inlet in fluid communication with the cavity;
an inlet port extending through the top wall and defining a passage into the cavity, the
inlet port having an aperture configured to receive the first sensor, wherein at least
part of the inlet port comprises a first indicator that is configured to coordinate with
an indicator on a connector on a first end of a supply conduit configured to be
coupled to the inlet port, a second end of the supply conduit configured to be coupled
to a gases supply;
an outlet port extending through the top wall and defining a passage out of the cavity,
the outlet port having an aperture configured to receive the second sensor, wherein at
least part of the outlet port comprises a second indicator that is configured to
coordinate with an indicator on a connector on a first end of an inspiratory conduit
configured to be coupled to the outlet port, the inspiratory conduit configured to
supply gases to a patient; and
interlock features in the top wall configured to receive corresponding interlock
features on the heater base to guide insertion of the chamber on the heater base so that
the first and second sensors are received in the apertures of the inlet and outlet ports;
and
a liquid conduit having a first end coupled to the liquid inlet and a second end
coupled to a spike configured to be connected to a liquid source.
2. The humidification apparatus of Claim 1, wherein the first and second sensors
are integrated into a sensor cartridge module that is mechanically and electrically
connected to the heater base.
3. The humidification apparatus of Claim 1 or 2, further comprising a supply
conduit and an inspiratory conduit, wherein a first end of the supply conduit
comprises a chamber end connector configured to be coupled to the inlet port, a
second end of the supply conduit is configured to be coupled to a gases supply, at
least part of the supply conduit chamber end connector comprises the first indicator, a
first end of the inspiratory conduit comprises a chamber end connector configured to
be coupled to the outlet port, and at least part of the inspiratory conduit chamber end
connector comprises the second indicator.
4. The humidification apparatus of any of Claims 1-3, wherein the first indicator
comprises a first color and the second indicator comprises a second color.
5. A humidification apparatus comprising:
a humidification chamber configured to hold a volume of liquid and comprising:
at least one side wall;
a top wall connected to the at least one side wall;
a base surface connected to the at least one side wall;
a cavity being at least partially defined by the at least one side wall and the top wall;
at least one of the at least one side wall and the top wall of the humidification
chamber having features that define a front of the humidification chamber and a back
of the humidification chamber;
an inlet port defining a passage into the cavity of the humidification chamber, the
inlet port having an aperture configured to receive a first sensor mounted on a heater
base;
an outlet port defining a passage out of the cavity of the humidification chamber, the
outlet port having an aperture configured to receive a second sensor mounted on a
heater base;
wherein an axis extending through the aperture of the inlet port is generally parallel to
an axis extending through the aperture of the outlet port, the axes extending in a front
to back direction of the humidification chamber and the axes extending generally
parallel to the base surface of the humidification chamber.
6. The humidification apparatus of Claim 5, further comprising a heater base
configured to receive the humidification chamber.
7. The humidification apparatus of Claim 5 or 6, wherein at least one of the at
least one side wall and the top wall comprises interlock features configured to receive
corresponding interlock features on the heater base to guide insertion of the chamber
on the heater base so that the first and second sensors are received in the apertures of
the inlet and outlet ports.
8. The humidification apparatus of Claim 7, wherein the interlock features
comprise recesses in the top wall and the interlock features on the heater base
comprise corresponding protrusions, the interlock features of the top wall and the
interlock features on the heater base being engaged through movement along the axes
of the apertures in the inlet port and the outlet port.
9. The humidification apparatus of Claim 6, wherein the heater base comprises a
sensor cartridge comprising the first and second sensors.
10. The humidification apparatus of Claim 9, further comprising an inspiratory
conduit comprising a chamber end connector configured to be coupled to the outlet
port and at least one sensor and/or heating element, the chamber end connector
comprising an electrical connection configured to couple to a corresponding electrical
connection on the sensor cartridge.
11. The humidification apparatus of Claim 5, further comprising a supply conduit,
an inspiratory conduit, and an expiratory conduit, wherein a first end of the supply
conduit is configured to be coupled to a gases supply, a second end of the supply
conduit comprises a chamber end connector configured to be coupled to the inlet port,
a first end of the inspiratory conduit comprises a chamber end connector configured
to be coupled to the outlet port, a first end of the expiratory conduit is configured to
receive gases exhaled by a patient in use and a second end of the expiratory conduit is
configured to be coupled to the gases supply.
12. The humidification apparatus of Claim 11, wherein the supply conduit,
inspiratory conduit, and expiratory conduit are coupled to one another to form a onepiece
circuit.
13. The humidification apparatus of Claim 12, wherein the supply conduit,
inspiratory conduit, and expiratory conduit are coupled with a mesh wrap, clips, a
hook and loop fastener, or a snap fit.
14. The humidification apparatus of any of Claims 11-13, wherein at least part of
the chamber end connector of the supply conduit and at least part of the inlet port
comprise a first indicator.
15. The humidification apparatus of Claim 14, wherein the first indicator
comprises a first color.
16. The humidification apparatus of any of Claims 1-15, wherein at least part of
the chamber end connector of the inspiratory conduit and at least part of the outlet
port comprise a second indicator.
17. The humidification apparatus of Claim 16, wherein the second indicator
comprises a second color.
18. The humidification apparatus of any of Claims 11-17, further comprising a Ypiece,
wherein a second end of the inspiratory conduit comprises a patient end
connector configured to be coupled to a first branch of the Y-piece, the first end of
the expiratory conduit comprises a patient end connector configured to be coupled to
a second branch of the Y-piece, and at least part of the Y-piece comprises a third
indicator.
19. The humidification apparatus of Claim 18, wherein the third indicator
comprises a third color.
20. The humidification apparatus of any of Claims 11-19, wherein the supply
conduit, inspiratory conduit, and expiratory conduit are held in a looped configuration
with a circuit sleeve for shipping and/or storage.
21. The humidification apparatus of Claim 20, wherein the circuit sleeve is
positioned on the conduits to hide selected connectors to help guide sequential
connection of the conduits.
22. The humidification apparatus of Claim 5, further comprising a liquid inlet and
a liquid conduit having a first end coupled to the liquid inlet and a second end
coupled to a spike configured to be connected to a liquid source.
23. The humidification apparatus of Claim 22, further comprising a winder,
wherein the liquid conduit extends from the liquid inlet, around the winder, and into
the winder and the spike is seated in the winder for shipping and/or storage.
24. The humidification apparatus of any of Claims 5-23, further comprising a port
cap configured to cover the inlet and outlet ports for shipping and/or storage, the port
cap comprising legs that extend into the inlet and outlet ports.
25. The humidification apparatus of any of Claims 5-24, further comprising grips
configured to allow an operator to hold the chamber more easily during installation.
26. The humidification apparatus of Claim 25, wherein the grips comprise
recesses in the side wall of the chamber.
27. The humidification apparatus of Claim 25 or 26, wherein the apertures are
positioned in the inlet and outlet ports so that the apertures face rearward and the
grips are located in a front half of the chamber to help orient the chamber for
installation on the heater base.