FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(See Section 10 and Rule 13)
A DEVICE FOR ALIGNING A TIBIAL TRAY
Applicant:
BIORAD MEDISYS PRIVATE LIMITED
AN INDIAN COMPANY REGISTERED UNDER THE COMPANIES ACT
WITH ADDRESS: SURVEY NO. 48, 3 & 48 7, PASHAN – SUS ROAD, SUS,
PUNE, MAHARASHTRA 411021
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE SUBJECT MATTER AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

TECHNICAL FIELD
[001] The present disclosure relates generally to a device for aligning a tibial
tray in the field of medical instruments and more particularly to the device for
aligning a tibial tray having a mechanism during total knee replacement (TKR)
5 surgical surgery.
BACKGROUND
[002] The human anatomy includes many articulating portions. For example, the femur and the tibia form a knee joint in the human anatomy. The femur and tibia articulate relative to one another during many activities, such as
10 walking or kneeling. With time, a disease and/or an injury can deteriorate the
knee joint, such that articulation of the joint becomes painful or impractical. When such injuries occur, anatomical replacements, particularly prosthetics, can be placed in a femur, a tibia, or both. The prosthetics may replace the articulating portions and allows a substantially natural joint articulation.
15 Replacing the damaged portions allows for a much easier and more practical
articulation of the knee joint to assist an individual in returning to a more natural lifestyle.
[003] Replacing a joint, such as the knee joint, an original or a natural anatomy
20 must first be removed or resected. In a total knee joint replacement procedures,
a tibial surface is prepared for the implantation of a tibial component of a knee
implant. A tibial preparation procedure starts with making an initial tibial
plateau cut on the proximal tibia of the knee joint. Using a tibial template, the
size of a trial tray is then selected and placed over a resected surface of a tibia.
25 After a trial reduction, the trial tray is removed and a punch guide is placed on

the resected tibial surface. A tibial bone is cut or reamed through openings in the punch guide and the trial tray prepare a tibial bone to receive a tibial component of the implant.
5 SUMMARY
[004] Embodiments of the present disclosure present technological improvements as solutions to one or more of the above-mentioned technical problems.
10 [005] In an embodiment of a present invention, a device for aligning a tibial
tray is disclosed. The device for aligning the tibial tray includes a handle, a slider button, a cam base plate, and a tibial tray. The handle has a first end and a second end. The first end includes a pair of edges, a recess, and a tongue. The recess receives a spring. The tongue interlocks with the tibial tray. The slider
15 button has a pair of vertical edges and a protrusion. The slider button provides
a linear motion along a length of the handle. The cam base plate has a pair of protrusions and encloses the slider button and the first end of the handle. The tibial tray has a front end and a back end. The back end has a notch. The tongue of the handle locks with the notch of the tibial tray. During assembly, the
20 handle is placed between the slider button and the cam base plate. The pair of
the protrusions of the cam base plate is disposed in between the pair of edges and the tongue of the handle. The spring is disposed of in the recess. The pair of protrusions of the cam base plate restricts the linear motion of the spring and allows a horizontal displacement of the tongue in between the pair of the
25 protrusions through the slider button. The slider button encloses the handle
with the cam base plate.

[006] During operation, the slider button actuates a specified displacement of the tongue with the notch of the tibial tray. The tongue engages and disengages with the tibial tray through cam mechanism.
5 [007] This summary is provided to introduce aspects related to the device for
aligning a tibial tray. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the present subject matter.
10 BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[008] The foregoing detailed description of embodiment's is better
understood when read in conjunction with the appended drawings. For the
purpose of illustrating the disclosure, there is shown in the present document
example constructions of the disclosure; however, the disclosure is not limited
15 to the specific system or method disclosed in the document and the drawings.
[009] The present disclosure is described in detail with reference to the
accompanying figures. In the figures, the left-most digit(s) of a reference
number identifies the figure in which the reference number first appears. The
20 same numbers are used throughout the drawings to refer various features of
the present subject matter.
[0010] Figure 1 illustrates an isometric view of a handle depicting the
configuration of the different parts of the handle, in accordance with an
25 embodiment of the subject matter.

[0011] Figure 2 illustrates an isometric view of a handle, depicting the internal configuration of the different parts of the handle, in accordance with an embodiment of the subject matter. 5
[0012] Figure 3 illustrates an exploded view of a handle, depicting the internal configuration of the different parts of the handle and a tibial tray, in accordance with an embodiment of the subject matter.
10 [0013] Figure 4 illustrates an isometric view of a handle, depicting the
configuration of the handle with a tibial tray, in accordance with an embodiment of the subject matter.
[0014] In the above accompanying drawings, a non-underlined number relates
15 to an item identified by a line linking the non-underlined number to the item.
When a number is non-underlined and accompanied by an associated arrow, the non-underlined number is used to identify a general item at which the arrow is pointing.
20 [0015] Further, the figures depict various embodiments of the present subject
matter for purposes of illustration only. One skilled in the art will readily recognize from the following discussion that alternative embodiment's of the structures and methods illustrated herein may be employed without departing from the principles of the present subject matter described herein.
25
DETAILED DESCRIPTION

[0016] Some embodiment's of this disclosure, illustrating all its features, will
now be discussed in detail. The words "comprising," "having," "containing,"
and "including," and other forms thereof, are intended to be equivalent in
meaning and be open ended in that an item or items following any one of these
5 words is not meant to be an exhaustive listing of such item or items, or meant
to be limited to only the listed item or items. It must also be noted that as used
herein and in the appended claims, the singular forms "a," "an," and "the"
include plural references unless the context clearly dictates otherwise.
Although a device for aligning a tibial tray, similar or equivalent to those
10 described herein can be used in the practice or testing of embodiments of the
present disclosure, the exemplary, the device for aligning a tibial tray is now described.
[0017] Various modifications to the embodiment will be readily apparent to
15 those skilled in the art and the generic principles herein may be applied to
other embodiments. For example, although the present disclosure will be
described in the context of a device for aligning a tibial tray, one of ordinary
skill in the art will readily recognize that a system can be utilized in other
orthopedic surgery, to provide a measurement of a tibial implant size and a
20 precise alignment of the tibial implant. Thus, the present disclosure is not
intended to be limited to the embodiments illustrated but is to be accorded the widest scope consistent with the principles and features described herein.
[0018] In orthopedic surgery, specifically in a total knee replacement surgery
25 several instruments need to be prepared. In the total knee replacement surgery,
a surgeon uses a specified prepared instruments during a procedure. The

surgeon generally uses a tibial template and/or a tibial tray to determine a
tibial implant size, various cutting instruments, and a punching or a reaming
guides to make an appropriate cuts or a reamed surface in a bone. The surgeon
also ensures a proper alignment of an implant before implanting a tibial
5 component. During a tibial preparation procedure, the surgeon needs to
remove and reposition or re-orient the tibial tray and replace the tibial tray using a handle.
[0019] In the prior art, a tibial alignment handle is attached by way of a screw
10 to a tibial tray trial. The screw-type handles can be cumbrous to attach the
screw. The screws are weaker and break over time. Another prior art discloses
a handle which is centrally attached to the instrument. The handle is often
removed and re-attached with a tibial tray to avoid tissue impingement and
provide a clear vision. The handle obscures a view of the trial trays, and guides
15 and makes alignment evaluation cumbersome. Generally, the handle reduces
a clear view available to a surgeon. Thus, it is desirable to have a system that enables quick and secure attachment or removal of the handle from the tibial tray trial without disturbing an alignment of the tibial tray and the handle.
20
[0020] In an embodiment, a device for aligning a tibial tray is disclosed. The device for aligning the tibial tray comprises a handle, a slider button, a cam base plate, and a tibial tray. The handle comprises a first end and a second end. The first end has a pair of edges, a recess, and a tongue. The tongue is placed
25 in between the pair of edges. The recess is a hollow space between the edges
and the tongue. The recess receives a spring in the hollow space. The tongue interlocks with the tibial tray. The pair of edges has a projection. The projection

is disposed at the tip of the pair of edges. The projection constrains a backward
and horizontal motion of the tibial tray, as the tongue engages with the notch
of the tibial tray. The slider button has a pair of vertical edges and a protrusion.
The slider button is of rectangular shape. The slider button has a lower surface,
5 an upper surface, a pair of vertical edges, and a protrusion. The slider button
provides a linear motion along the length of the handle. The pair of vertical
edges are coupled at the lower surface. The pair of vertical edges are mounted
on the pair of edges of the handle. The protrusion is disposed at the upper
surface. The protrusion is perpendicular to the length of the handle. The
10 protrusion provides a space for a forward and a backward motion along a
length of the handle. The cam base plate has a pair of protrusions of a predefined shape. The cam base plate is coupled with the slider button. The cam base plate encloses the first end of the handle with the slider button.
15 [0021] The tibial tray is of predefined shape and of a specified dimension, the
tibial tray has a front end and a back end. The back end includes a notch. The tibial tray is configured to determine a tibial implant size. The handle locks the tibial tray through the notch. The tibial tray determines a tibial implant size.
20 [0022] During assembly, the handle is placed between the slider button and the
cam base plate, such that the pair of protrusions of the cam base plate is disposed in between the pair of edges and the tongue of the handle. The spring is placed on the recess. The pair of protrusions of the cam base plate restricts the linear motion of the spring and allows a horizontal displacement of the
25 tongue in between the pair of protrusions through the slider button. The pair

of edges, the tongue, and the recess of the first end of the handle are enclosed. The tibial tray is coupled through the notch with the tongue of the handle.
[0023] During operation, the slider button slides over the length of the handle
5 in the forward direction. As the slider button slides, the spring placed in the
recess also slides and restricts the protrusion of the cam base plate. With the sliding of the slider button, the spring provides a linear motion in between the tongue and a lateral edge of the handle. The linear motion of the spring is restricted by the protrusion of the cam base plate. Then the spring exerts a
10 mechanical force over the tongue. Due to the force exerted on the tongue, the
tongue moves in a horizontal direction and the said horizontal motion is restricted over another protrusion of the cam base plate. The tongue of the handle gets interlocked with the tibial tray through the notch. The sliding of the tongue is coupled to the handle and the tibial tray is done through a cam
15 mechanism.
[0024] It should be noted that the above advantages and other advantages will be better evident in the subsequent description. Further, in the subsequent section, the present subject is better explained with reference to the figures.
[0025] Referring now to the drawings, particularly by their reference numbers,
20 Figure 1 illustrates a device for aligning a tibial tray 100. The device for aligning
a tibial tray 100 comprises a handle 104, and a slider button 102. The handle
comprises a first end 108 and a second end 106. The slider button 102 is
mounted over the first end 108 of the handle 104. The slider button 102 slides
over the front end 108 of the handle to provide a linear motion. The slider
25 button 102 provides a forward and a backward linear motion and the slider

button 102 slides over the length of the handle 104. The handle 104 engages and disengages with the tibial tray.
[0026] Figure 2 illustrates different parts of the handle 200. The different parts
5 of the handle 200 comprise a cam base plate 216, a handle with a first end 108,
and a second end 106. The first end 108 comprises a pair of edges 206, a tongue 202, and a spring 214. The cam base plate 216 comprises a pair of protrusions 204. The cam base plate 216 is placed below the first end 108 of the handle 104 such that the pair protrusion 204 of the cam base plate 216 is placed in between
10 the tongue 202 and the pair of edges 206. The spring 214 is also placed in
between the tongue 202 and a lateral edge 206-a of the handle 104. The spring 214 provides a linear motion in between the tongue 202 and a lateral edge 206-a of the handle 104. The linear motion of the spring 214 is restricted by the protrusion 204 of the cam base plate 216. Then the spring 214 exerts a
15 mechanical force over the tongue 202. Due to the force exerted on the tongue
202, the tongue 202 moves in a horizontal direction and the said horizontal motion is restricted over another protrusion of the cam base plate 216. [0027] Figure 3 illustrates a handle with different parts and a tibial tray 300. The different parts are a handle 104, a slider button 102, a cam base plate 216,
20 and a tibial tray 302. The handle 104 comprises a first end 108, and a second
end 106. The first end 108 has a pair of edges 206, a recess 310, and a tongue 202. The tongue 202 is placed in between the pair of edges 206. The recess 310 is a hollow space in between a lateral edge 206-a and the tongue 202. The recess 310 receives a spring 214 in the hollow space. The tongue 202 interlocks with
25 the tibial tray 302. The pair of edges 206 has a projection 320. The projection
320 is disposed at the tip of the pair of edges 206. The projection 320 constraints

a backward motion of the tibial tray 302. The slider button 102 is rectangular
in shape. The slider button 102 has a lower surface, an upper surface, a pair of
vertical edges 306, and a protrusion 308. The slider button 102 provides a linear
motion along the length of the handle 104. The pair of vertical edges 306 are
5 coupled at the lower surface. The pair of vertical edges 306 are mounted on the
pair of edges 206 of the handle 104. The protrusion 308 is disposed at the upper surface. The protrusion 308 is perpendicular to the length of the slider button 102. The protrusion 308 provides a space for forward and backward motion along the length of the handle. The cam base plate 216 has a pair of protrusion
10 204 of a predefined shape. The cam base plate 216 is coupled with the slider
button 102. The cam base plate 216 encloses the first end 108 of the handle 104 with the slider button 102. The tibial tray 302 is of a predefined shape and has a standard size. The tibial tray has a front end 312 and a back end 314. The back end 314 includes a notch 304. The tongue 202 of the handle 104 is engaged or
15 disengaged with a notch 304 of the tibial tray 302 through a cam mechanism.
[0028] Referring to Figure 4 illustrates a coupling of a handle with a tibial tray 400. The handle 104 is placed between the slider button 102 and the cam base plate 216, such that the pair of the protrusion 204 of the cam base plate 216 is disposed in between the pair of edges 206 and the tongue 202 of the handle
20 104. The spring 214 is placed on the recess 310. The pair of protrusions 204 of
the cam base plate 216 restricts the linear motion of the spring 214 and allows a horizontal displacement of the tongue 202 in between the pair of protrusions 204 through the slider button 102. The pair of edges 206, the tongue 202, and the recess 310 of the first end 108 of the handle 104 are enclosed. The tibial tray
25 302 is coupled through the notch 304 with the tongue 202 of the handle 104.

[0029] Exemplary embodiment's discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, the following advantages may include.
[0030] Some embodiment's of the device for aligning a tibial tray use a spring
5 in the handle for the precise alignment and implantation size of a tibia.
[0031] Some embodiment's of the device for aligning a tibial tray use a spring in the handle for easy engagement and disengagement of the handle with the tibial tray with a quick-release cam mechanism.
[0032] Although the description provides implementations of a device for
10 aligning a tibial tray, it is to be understood that the above descriptions are not
necessarily limited to the specific features or methods of systems. Rather, the specific features and methods are disclosed as examples of implementations for the device for aligning a tibial tray.

We claim,
1. A device for aligning a tibial tray (302) comprises:
a handle (104), wherein the handle (104) comprises a first end (108), and
a second end (106), wherein the first end (108) comprises a pair of edges
5 (206), a recess (310), and a tongue (202), wherein the recess (310) is
configured to receive a spring (214), wherein the tongue (202) is configured to interlock with the tibial tray (302);
a slider button (102), wherein the slider button (102) comprises a pair of vertical edges (306) and a protrusion (308), wherein the slider button (102)
10 is configured to provide a linear motion along a length of the handle (104);
a cam base plate (216), wherein the cam base plate (216) comprises a pair of protrusions (204), wherein the cam base plate (216) is configured to enclose the slider button (102) and the first end (108) of the handle; a tibial tray (302), wherein the tibial tray (302) comprises a front end (312)
15 and a back end (314), wherein the back end (314) comprises a notch (304),
wherein the notch (304) is configured to lock the handle (104) with the tibial tray (302);
wherein during assembly, the handle (104) is placed between the slider button (102) and the cam base plate (216), wherein the pair of the
20 protrusion (204) of the cam base plate (216) is disposed in between the
pair of edges (206) and the tongue (202) of the handle (104), wherein the spring (214) is disposed on the recess (310), wherein the pair of protrusion (204) of the cam base plate (216) is configured to restrict the linear motion of the spring (214) and allows a horizontal displacement of the tongue
25 (202) in between the pair of the protrusion (204) through the slider button

(102), wherein the slider button (102) is configured to enclose the handle (104) with the cam base plate (216); and
wherein during operation, the slider button (102) actuates a specified
displacement of the tongue (202) with the notch (304) of the tibial tray
5 (302), wherein the tongue (202) is configured to engage and disengage
with a tibial tray (302) through cam mechanism.
2. The device for aligning a tibial tray (302) as claimed in claim 1, wherein the
slider button (102) is of a rectangular shape, wherein the slider button (102)
10 comprises a lower surface, an upper surface, a pair of vertical edges (306), and
a protrusion (308), wherein the pair of vertical edges (306) are coupled at the lower surface, wherein the protrusion (308) is disposed at an upper surface, wherein the pair of vertical edges (306) are mounted on the pair of edges (206) of the handle (104), wherein the protrusion (308) is perpendicular to the length
15 of the handle (104), wherein the protrusion (308) is configured to provide a
space for forward and backward motion along the length of the handle (104).
3. The device for aligning a tibial tray (302) as claimed in claim 1, wherein the
cam base plate (216) comprises a pair of protrusions (204) of predefined shape,
20 wherein the cam base plate (216) is coupled with the slider button (102).
4. The device for aligning a tibial tray (302) as claimed in claim 1, wherein the
tibial tray (302) is of specified dimension, wherein the tibial tray (302) is
configured to determine a tibial implant size.
25

5. The device for aligning a tibial tray (302) as claimed in claim 1, comprises a
projection (320), wherein the projection (320) is disposed at the tip of the pair
of edges (206), wherein the projection (320) is configured to constraint a
backward and horizontal motion of the tibial tray (302) as the tongue (202)
5 engages with the notch (304) through cam mechanism.