Title of Invention: Syringe with Safety Mechanism
Technical field
[0001]
This invention relates to a syringe with a safety mechanism.
Background technology
[0002]
For example, European Patent No. 2376153 discloses a syringe with a safety mechanism that includes a syringe with a needle, a needle cap, an inner sleeve and an outer sleeve. In this safety syringe, the needle cap is removed during use.
prior art documents
patent literature
[0003]
Patent document 1: European patent No. 2376153
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0004]
In a syringe with a safety mechanism as described in European Patent No. 2376153, it is conceivable to use an outer sleeve as a needle cover in order to prevent accidental pricking after use. That is, in the syringe with the safety mechanism, after use of the syringe, the needle cover (outer sleeve) can be relatively displaced (slid) toward the needle with respect to the syringe to a protective position where the periphery of the needle is surrounded. It is conceivable to configure However, if the needle cover slides to the protective position and then returns to the use position where the needle is exposed, accidental pricking or the like may occur. Also, if the needle cover is displaced toward the protective position before use, that is, before the needle cap is removed due to vibration during transportation, it becomes difficult to remove the needle cap during use.
[0005]
An object of the present invention is to provide a syringe with a safety mechanism that can prevent the needle cover from being displaced from the protection position to the use position.
Means to solve problems
[0006]
A syringe with a safety mechanism according to one aspect of the present invention includes a syringe, a needle connected to the tip of the syringe, a holder fixed to the syringe, and a needle around the needle from a use position exposing the needle. a needle cover displaceable relative to the syringe along the axial direction of the syringe toward a protective position surrounding the The needle cover is engaged with the needle cover in the use position from the radially inner side of the needle cover, and the needle cover is held in the protective position from the radially inner side of the needle cover in the protective position. At least one member of the holder and the needle cover has a protrusion that protrudes toward the other member of the holder and the needle cover, and the other member includes: The needle cover has a restricting portion that abuts on the protruding portion so as to restrict relative displacement of the needle cover from the protecting position toward the using position along the axial direction of the syringe with respect to the syringe.
Effect of the invention
[0007]
According to the present invention, it is possible to provide a syringe with a safety mechanism capable of suppressing displacement of the needle cover from the protection position to the use position.
Brief description of the drawing
[0008]
1 is a perspective view of a syringe with a safety mechanism according to one embodiment of the present invention; FIG.
2 is a perspective view of the syringe with a safety mechanism shown in FIG. 1 with a cap removed. FIG.
3 is a perspective view of the needle cover in a protective position; FIG.
4 is a perspective view of a state in which the guide protrusion is in contact with the contact surface; FIG.
5 is a cross-sectional view of the syringe with a safety mechanism shown in FIG. 1. FIG.
6 is a cross-sectional view of FIG. 5 with the cap removed. FIG.
7 is a cross-sectional view showing a state slightly displaced from FIG. 6 toward the needle cover protecting position; FIG.
8 is a cross-sectional view of the needle cover in a protective position; FIG.
9 is a perspective view of a holder; FIG.
10 is a cross-sectional view taken along line XX shown in FIG. 4;
11 is a cross-sectional view along line XI-XI shown in FIG. 4;
12 is a perspective view of the holder and the needle cover when the needle cover is positioned at the use position; FIG.
13 is a cross-sectional view taken along line XIII-XIII in FIG. 12;
14 is a perspective view showing a state in which the needle cover is slightly displaced from the state shown in FIG. 12 toward the protection position; FIG.
15 is a perspective view of the holder and the needle cover when the needle cover is positioned at the protection position; FIG.
16 is a perspective view showing a state in which the needle cover is axially displaced from the state shown in FIG. 15 toward the use position; FIG.
MODE FOR CARRYING OUT THE INVENTION
[0009]
An embodiment of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are given the same numbers.
[0010]
As shown in FIGS. 1 to 9, the syringe 1 with a safety mechanism includes a syringe 100, a needle 200, a needle cap 300, a holder 400, and a needle cover 500. In this syringe 1 with a safety mechanism, the needle cap 300 is removed at the time of use, and after use, the needle cover 500 is moved from the use position (the position shown in FIG. 2) to the protection position (the position shown in FIG. 3). , erroneous pricking, etc. can be suppressed.
[0011]
The syringe 100 has a cylindrical barrel body 110 and a needle holding part 120 connected to the tip of the barrel body 110 (upper end in FIG. 5). In addition, illustration of a plunger and a gasket is omitted in each figure.
[0012]
The needle holding portion 120 has an outer shape smaller than that of the barrel body 110 . Needle holding portion 120 holds needle 200 . As shown in FIGS. 5 to 8 and the like, the distal end portion 122 of the needle holding portion has a shape projecting outward in the radial direction of the barrel body 110 .
[0013]
A needle cap 300 is attached to the syringe 100 so as to cover the needle 200 . Specifically, open end 310 (see FIG. 5) of needle cap 300 fits over distal end 122 of needle holder 120 . Needle cap 300 is removable from syringe 100 .
[0014]
The holder 400 is fixed to the needle holding portion 120 of the syringe 100. The holder 400 is not displaceable relative to the barrel body 110 in the axial direction of the barrel body 110 and is rotatable relative to the barrel body 110 around the central axis of the barrel body 110 . The holder 400 has an enclosing tube 410 , a neck portion 420 , a locking tube 430 and guide projections 440 .
[0015]
The enclosing cylinder 410 encloses the needle holding portion 120 . Enveloping tube 410 is formed in a cylindrical shape. The enclosing cylinder 410 is rotatable about the central axis of the barrel body 110 with respect to the needle holding portion 120 . As shown in FIG. 9, the envelope 410 is formed with a notch extending in the axial direction of the envelope 410 .
[0016]
The neck portion 420 has a shape protruding inward in the radial direction of the enclosing cylinder 410 from the tip portion (upper end portion in FIG. 5) of the enclosing cylinder 410 . Neck 420 engages tip 122 of needle holder 120 . This prevents the holder 400 from being detached from the barrel body 110 .
[0017]
The locking cylinder 430 is a part that locks the needle cover 500 . Locking tube 430 is formed outside enveloping tube 410 in the radial direction of enveloping tube 410 . Locking tube 430 has a shape extending from the outer edge of neck 420 to one side and the other side in the axial direction of enclosing tube 410 . As shown in FIG. 5, locking barrel 430 surrounds open end 310 of needle cap 300 . The open end 310 is press-fitted into the lock tube 430 . Details of the locking tube 430 will be described later.
[0018]
The guide projection 440 has a shape that protrudes outward in the radial direction of the enclosing cylinder 410 from the outer peripheral surface of the locking cylinder 430 . The guide protrusion 440 is formed in a disk shape or columnar shape. In this embodiment, the holder 400 has a pair of guide projections 440 provided at positions sandwiching the center of the enclosing tube 410 .
[0019]
Needle cover 500 extends along the axial direction of syringe 100 from the use position exposing needle 200 (the position shown in FIG. 2) to the protective position surrounding needle 200 (the position shown in FIG. 3). Relative displacement with respect to 100 is possible. More specifically, the needle cover 500 is displaceable relative to the barrel body 110 from the use position toward the protection position when the needle cap 300 is removed from the syringe 100 . On the other hand, displacement of needle cover 500 from the protection position toward the use position along the axial direction of barrel body 110 is restricted. The needle cover 500 has a cover body 510 and a bulging portion 520 .
[0020]
The cover main body 510 is formed in a cylindrical shape. The inner diameter of the cover body 510 is set equal to or slightly larger than the outer diameter of the barrel body 110 . The cover main body 510 surrounds the locking cylinder 430 . The cover main body 510 has a use position engagement portion 511 , a protection position engagement portion 512 and a guide groove 513 .
[0021]
The use position engaging portion 511 is a portion where the cover main body 510 engages with the locking tube 430 in the use position. In this embodiment, the use position engaging portion 511 is formed of a through hole penetrating the cover main body 510 in its radial direction. The use position engaging portion 511 is provided near the tip of the cover body 510 in the direction from the use position to the protection position (hereinafter referred to as "protection direction").
[0022]
The protective position engaging portion 512 is a portion where the cover main body 510 engages with the locking tube 430 in the protective position. In the present embodiment, the protective position engaging portion 512 is configured by a through hole penetrating the cover main body 510 in its radial direction. The protection position engagement portion 512 is provided at a portion of the cover body 510 spaced apart from the use position engagement portion 511 in the direction opposite to the protection direction.
[0023]
The guide groove 513 guides the guide protrusion 440 when the cover body 510 is displaced from the use position toward the protection position. That is, guide protrusion 440 has a shape protruding toward needle cover 500, and moves within guide groove 513 when cover main body 510 is displaced from the use position to the protection position. The guide groove 513 is formed of a through hole penetrating the cover main body 510 in its radial direction. The guide groove 513 has a guide surface 513a and a contact surface 513b.
[0024]
The guide surface 513a has a shape that rotates the cover body 510 around the central axis of the barrel body 110 when the cover body 510 is displaced from the use position to the protection position. In this embodiment, the guide surface 513a has a shape that rotates the cover body 510 about the central axis of the barrel body 110 by 45 degrees when the cover body 510 is displaced from the use position to the protection position.
[0025]
As shown in FIGS. 4 and 10, the contact surface 513b contacts the guide protrusion 440 when the cover body 510 is displaced along the axial direction of the barrel body 110 from the protection position toward the use position. Therefore, the cover body 510 is restricted from being displaced along the axial direction of the barrel body 110 from the protection position toward the use position. In other words, the guide projection 440 constitutes a projecting portion that projects toward the needle cover 500, and the contact surface 513b extends along the axial direction of the barrel body 110 so that the cover body 510 moves from the protection position to the use position. It constitutes a restricting portion that restricts relative displacement with respect to the barrel body 110 . The needle 200 is surrounded by the needle cover 500 when the guide projection 440 is in contact with the contact surface 513b (the state shown in FIGS. 4, 10 and 11).
[0026]
The bulging portion 520 has a shape that bulges inward in the radial direction of the cover body 510 from the inner peripheral surface of the cover body 510 . The bulging portion 520 has a first vertical rib 521 and a second vertical rib 522 .
[0027]
As shown in FIG. 10, the first vertical rib 521 is provided at a position spaced apart from the contact surface 513b in the protection direction (upward in FIG. 10). The first vertical rib 521 has a shape extending along the axial direction of the cover body 510 . 10 and 13 , the bulging portion 520 has a pair of first longitudinal ribs 521 provided at positions sandwiching the central axis of the cover body 510 .
[0028]
As shown in FIG. 11, the second vertical rib 522 is provided at a position spaced apart from the protection position engaging portion 512 in the protection direction (upward in FIG. 11). The second vertical rib 522 has a shape extending along the axial direction of the cover body 510 . The second vertical rib 522 is provided at a position rotated 90 degrees from the first vertical rib 521 in the circumferential direction of the cover body 510 . As shown in FIGS. 11 and 13 , the bulging portion 520 has a pair of second longitudinal ribs 522 provided at positions sandwiching the central axis of the cover body 510 .
[0029]
Here, the locking tube 430 will be explained. As shown in FIG. 9 , the lock tube 430 has a first wall portion 432 , a second wall portion 431 and a lock portion 433 .
[0030]
The first wall portion 432 is formed at a position facing the bulging portion 520 and the needle cover 500 in the use position in the radial direction. In this embodiment, the locking cylinder 430 has four first walls 432 provided at intervals of 90 degrees along the circumferential direction of the surrounding cylinder 410 . Hereinafter, first vertical rib 521 of needle cover 500 in the use position and first wall portion 432 that face radially opposite needle cover 500 will be referred to as "first wall portion 432A," The first wall portion 432 that faces the longitudinal rib 522 in the radial direction of the needle cover 500 may be referred to as a "first wall portion 432B".
[0031]
Each first wall portion 432 allows the needle cover 500 to be displaced while rotating about the central axis of the barrel body 110 from the use position toward the protection position. The outer surface of each first wall portion 432 is formed flat. As shown in FIG. 13, a gap is formed between the first longitudinal rib 521 of the needle cover 500 and the opposing first wall portion 432A in the use position. A gap is formed between the second longitudinal rib 522 of the needle cover 500 in the use position and the opposing first wall portion 432B. Therefore, as shown in FIGS. 12 to 15, needle cover 500 is allowed to rotate about the central axis of barrel body 110 and move from the use position toward the protection position. 12, 14 and 15, only the first longitudinal rib 521 of the bulging portion 520 is shown. Also, in FIG. 14, illustration of the locking projection 435 is omitted.
[0032]
The second wall portion 431 is provided between the first wall portions 432 adjacent to each other. That is, the locking tube 430 has a pair of second wall portions 431 sandwiching the center of the surrounding tube 410 . More specifically, each second wall portion 431 extends in the same direction as the direction in which needle cover 500 rotates about the central axis of barrel body 110 when needle cover 500 is displaced from the use position to the protection position. It is provided at a position adjacent to the portion 432A (the first wall portion 432 radially facing the first longitudinal rib 521 in the use position). Each second wall portion 431 has a thickness greater than the thickness of the first wall portion 432 .
[0033]
Each second wall portion 431 has a receiving portion 431a formed at the tip in the protection direction. Receiving portion 431a axially opposes first vertical rib 521 of needle cover 500 in the protective position, and is axially opposed to first vertical rib 521 of needle cover 500 when needle cover 500 is axially displaced from the protective position toward the use position. 521. That is, the first vertical rib 521 constitutes a protruding portion that protrudes toward the holder 400, and the receiving portion 431a protrudes from the barrel body 110 when the needle cover 500 moves from the protection position to the use position with respect to the barrel body 110. It constitutes a restricting portion that restricts relative displacement along the axial direction of the.
[0034]
The locking portion 433 locks the needle cover 500 from the inner side in the radial direction of the needle cover 500 . Locking portion 433 holds needle cover 500 in the use position. Specifically, locking portion 433 engages use position engaging portion 511 of needle cover 500 in the use position. Locking portion 433 also holds needle cover 500 in the protective position. Specifically, locking portion 433 engages protective position engaging portion 512 of needle cover 500 in the protective position.
[0035]
The locking portion 433 is provided between the first wall portions 432 adjacent to each other. That is, the locking tube 430 has a pair of locking portions 433 sandwiching the center of the surrounding tube 410 . More specifically, each locking portion 433 extends along the first wall portion in the same direction as needle cover 500 rotates about the central axis of barrel body 110 when needle cover 500 is displaced from the use position to the protection position. 432B (the first wall portion 432 radially facing the second vertical rib 522 in the use position).
[0036]
A pair of slits S are formed on both sides of each locking portion 433 of the locking tube 430 . As a result, each locking portion 433 can bend inward in the radial direction of the enclosing tube 410 . The locking portion 433 has a flexible piece 434 and a locking projection 435 .
[0037]
The flexible piece 434 is sandwiched between a pair of slits S and formed like a plate.
The locking projection 435 has a shape that protrudes radially outward from the outer surface of the flexible piece 434 . The locking projection 435 engages with the use position engaging portion 511 and the protecting position engaging portion 512 from the inside of the needle cover 500 in the radial direction. The locking projection 435 is provided on the outer surface of the tip of the flexible piece 434 in the protection direction.
[0038]
The flexible piece 434 is elastically deformable so that the locking projection 435 is displaced between the engaged position and the disengaged position. The engagement position is a position (the position shown in FIG. 6) where locking projection 435 engages use position engaging portion 511 when needle cover 500 is positioned at the use position. The disengaged position is a position (shown in FIG. 7) where locking projection 435 disengages radially inwardly from use position engaging portion 511 when needle cover 500 is displaced from the use position to the protection position.
[0039]
As shown in FIGS. 9 to 11, the flexible piece 434 has a receiving portion 434a formed at the tip in the protection direction. Receiving portion 434a axially opposes second longitudinal rib 522 of needle cover 500 in the protective position, and is axially opposed to second longitudinal rib 522 of needle cover 500 when needle cover 500 is axially displaced from the protective position toward the use position. 522. That is, the second vertical rib 522 constitutes a protruding portion that protrudes toward the holder 400, and the receiving portion 434a allows the needle cover 500 to move relative to the barrel body 110 from the protection position toward the use position. It constitutes a restricting portion that restricts relative displacement along the axial direction of the.
[0040]
As shown in FIG. 5, with the needle cap 300 attached to the syringe 100, the open end 310 of the needle cap 300 is press fit between the tip 122 of the needle holder 120 and the flexible piece 434. ing. That is, the open end portion 310 constitutes a support portion that supports the engaging portion 433 from the inside in the radial direction so as to restrict the engaging portion 433 from bending inward in the radial direction.
[0041]
Next, the procedure for using the syringe 1 with a safety mechanism will be explained. First, before using this syringe 1 with a safety mechanism, a needle cap 300 is attached to the syringe 100 as shown in FIGS. In this state, since the opening end (supporting portion) 310 of the needle cap 300 supports the engaging portion 433 from the inside in the radial direction, the engaging portion 433 is prevented from being bent radially inward. be. Therefore, when needle cap 300 is attached to syringe 100, needle cover 500 is held at the use position. In other words, in this syringe 1 with a safety mechanism, needle cover 500 is restricted from being displaced to the protective position before needle cap 300 is removed.
[0042]
The needle cap 300 is removed when using the syringe 1 with a safety mechanism. This exposes the needle 200 .
[0043]
After use, the needle cover 500 is moved relative to the barrel body 110 from the use position toward the protection position. At the start of this movement, the locking portion 433 is not supported by the open end portion 310 of the needle cap 300, so that the locking projection 435 is pressed by the cover body 510 so that the flexible piece 434 moves radially inward. bend. Therefore, the needle cover 500 is allowed to move in the protection direction. The needle cover 500 moves along the guide groove 513 to the protective position while rotating around the central axis of the barrel body 110 . When the needle cover 500 is rotated and moved, the first vertical rib 521 is kept separated from the first wall portion 432A, and the second vertical rib 522 is kept separated from the first wall portion 432B. be.
[0044]
Then, when the needle cover 500 reaches the protection position, the flexible piece 434 returns so that the locking projection 435 engages the protection position engaging portion 512 . The needle cover 500 is thus held in the protective position. At this time, as shown in FIG. 15, the first vertical rib 521 faces the receiving portion 431a of the second wall portion 431 in the axial direction. Also, the second vertical rib 522 faces the receiving portion 434a of the flexible piece 434 in the axial direction.
[0045]
Here, when an external force is applied to the needle cover 500 to move the needle cover 500 from the protection position to the use position along the axial direction of the barrel body 110, as shown in FIGS. 4, 10 and 16, The guide protrusion 440 contacts the contact surface 513 b , the first vertical rib 521 contacts the receiving portion 431 a of the second wall portion 431 , and the second vertical rib 522 contacts the receiving portion 434 a of the flexible piece 434 . Therefore, further displacement of the needle cover 500 in the direction opposite to the protection direction along the axial direction of the barrel body 110 is restricted. 16, illustration of the second vertical rib 522 is omitted.
[0046]
In this way, in a state where the projecting portions (the guide projection 440, the first vertical rib 521, the second vertical rib 522) are in contact with the restricting portions (the contact surface 513b, the receiving portion 431a, and the receiving portion 434a), the needle 200 is , is surrounded by a needle cover 500 . Therefore, the occurrence of erroneous pricking or the like after use is suppressed.
[0047]
In addition, in this embodiment, the locking portion 433 has the function of locking the needle cover 500 in the use position or the protection position, and cooperates with the second longitudinal rib 522 to move the needle cover 500 from the protection position to the use position. and a function of restricting displacement along all axial directions.
[0048]
It should be noted that the embodiments disclosed this time are illustrative in all respects and should not be considered restrictive. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications within the meaning and scope equivalent to the scope of the claims.
[0049]
For example, the axial displacement of the needle cover 500 relative to the syringe 100 from the protective position to the use position can be regulated by a regulating mechanism consisting of a single protrusion and a single regulating portion. any one of a regulating mechanism consisting of the protrusion 440 and the contact surface 513b, a regulating mechanism consisting of the first vertical rib 521 and the receiving portion 431a, and a regulating mechanism consisting of the second vertical rib 522 and the receiving portion 434a; Alternatively, any two may be omitted.
[0050]
It will be understood by those skilled in the art that the exemplary embodiments described above are specific examples of the following aspects.
[0051]
A syringe with a safety mechanism according to one aspect of the present invention includes a syringe, a needle connected to the tip of the syringe, a holder fixed to the syringe, and a needle around the needle from a use position exposing the needle. a needle cover displaceable relative to the syringe along the axial direction of the syringe toward a protective position surrounding the The needle cover is engaged with the needle cover in the use position from the radially inner side of the needle cover, and the needle cover is held in the protective position from the radially inner side of the needle cover in the protective position. a locking portion for locking, and at least one member of the holder and the needle cover includes the holder and a protruding portion protruding toward the other member of the needle cover, and the other member extends the needle cover from the protective position toward the use position along the axial direction of the syringe. and a regulating portion that abuts on the projecting portion so as to regulate relative displacement with respect to.
[0052]
In this syringe with a safety mechanism, at least one member of the holder and the needle cover has a projecting portion, and the other member has a restricting portion. The projecting portion comes into contact with the restricting portion when relatively displaced with respect to the syringe along the . Therefore, displacement of the needle cover from the protection position to the use position is suppressed.
[0053]
In the syringe with a safety mechanism, the holder has a guide protrusion having a shape protruding toward the needle cover, and the needle cover is displaced from the use position toward the protection position. A guide groove is provided to guide the guide protrusion, and the guide groove rotates the needle cover about the central axis of the syringe when the needle cover is displaced from the use position to the protection position. a guide surface having a shape; and an abutment surface that abuts against the guide projection when the needle cover is displaced along the axial direction from the protective position toward the use position, the guide projection being , the projecting portion may be configured, and the contact surface may configure the restricting portion.
[0054]
In this aspect, the guide projections achieve both stable movement of the needle cover from the use position to the protection position and suppression of displacement of the needle cover from the protection position to the use position.
[0055]
Alternatively, in the syringe with a safety mechanism, the needle cover has a bulging portion that bulges toward the holder, and the holder is axially aligned with the bulging portion of the needle cover in the protective position. a receiving portion facing the needle cover and abutting against the bulging portion when the needle cover is displaced along the axial direction from the protecting position toward the using position; and the receiving portion may constitute the restricting portion.
[0056]
In this case, the holder has a guide protrusion having a shape that protrudes toward the needle cover, and the needle cover has the guide protrusion that protrudes toward the needle cover when the needle cover is displaced from the use position toward the protection position. A guide groove for guiding the guide protrusion is provided, and the guide groove has a shape that rotates the needle cover around the central axis of the syringe when the needle cover is displaced from the use position to the protection position. The holder has a guide surface, and the holder is formed at a position facing the bulging portion of the needle cover in the use position and the needle cover in the radial direction, and the needle cover is protected from the use position. a first wall portion for allowing rotational displacement about the central axis of the syringe toward a position; and a second wall portion provided at a position adjacent to the first wall portion in the same direction as the direction of rotation about the central axis, wherein the needle cover of the second wall portion extends from the use position. Preferably, the tip in the direction toward the protection position constitutes the receiving part.
[0057]
In this aspect, both smooth movement of the needle cover from the use position to the protection position and suppression of displacement of the needle cover from the protection position to the use position are achieved.
[0058]
Further in this case, the holder further has another first wall portion different from the first wall portion, and the locking portion is configured to be adapted to move the needle cover when the needle cover is displaced from the use position to the protection position. The needle cover is provided at a position adjacent to the other first wall portion in the same direction as the direction in which the needle cover rotates about the central axis of the syringe, and the bulging portion is arranged so that the needle cover is in the use position. a first longitudinal rib facing the first wall portion in the radial direction of the needle cover when the needle cover is positioned, and facing the second wall portion in the axial direction when the needle cover is positioned in the protective position; and, when the needle cover is positioned at the use position, the other first wall faces the needle cover in the radial direction, and when the needle cover is positioned at the protection position, the engaging portion and second longitudinal ribs facing in the axial direction, and the tip portion of the locking portion in the direction in which the needle cover faces from the use position to the protection position may constitute the receiving portion. preferable.
[0059]
By doing so, the displacement of the needle cover from the protection position to the use position is more reliably suppressed.
[0060]
The guide groove further has a contact surface that contacts the guide projection when the needle cover is displaced along the axial direction from the protection position toward the use position, and the guide projection: Preferably, the projecting portion is configured, and the contact surface is configured as the restricting portion.
[0061]
As described above, according to the syringe with a safety mechanism according to the aspect of the present invention, displacement of the needle cover from the protection position to the use position is suppressed.
[0062]
A syringe with a safety mechanism according to another aspect of the present invention includes a syringe, a needle connected to the tip of the syringe, and a needle attached to the syringe so as to cover the needle. a holder fixed to the syringe; and from a use position exposing the needle when the needle cap is removed from the syringe, when the needle cap is removed from the syringe. a needle cover displaceable relative to the syringe along the axial direction of the syringe toward a protective position surrounding the needle, the holder holding the needle cover in the use position. a locking portion that locks the needle cover in the use position from the inner side in the radial direction of the needle cover, and the locking portion moves the needle cover from the use position to the protection position. and the needle cap is elastically deformable so as to bend inward in the radial direction so as to allow the needle cap to restrict the locking portion from bending inward in the radial direction. It has a support portion that supports from the inner side in the radial direction.
[0063]
In this syringe with a safety mechanism, when the needle cap is attached to the syringe, the supporting portion of the needle cap supports the locking portion from the inside in the radial direction, so that the locking portion flexes radially inward. It is suppressed. Therefore, when the needle cap is attached to the syringe, the needle cover is held in the use position. In other words, in this safety-equipped syringe, the needle cover is restricted from being displaced to the protective position before the needle cap is removed. On the other hand, when the needle cap is removed from the syringe, the engaging portion can be bent radially inward, thereby allowing the needle cover to be displaced from the use position to the protection position.
[0064]
Moreover, it is preferable that slits extending in a direction parallel to the axial direction of the syringe are formed on both sides of the locking portion in the circumferential direction of the holder in the holder.
[0065]
With this configuration, the locking portion is effectively elastically deformed when the needle cover is displaced from the use position to the protection position.
[0066]
Further, the locking portion includes a flexible piece extending in a direction parallel to the axial direction of the syringe, and a locking projection having a shape projecting outward in the radial direction from the flexible piece. and, the needle cover has a use position engaging portion that engages with the locking projection at the use position, and the flexible piece has a and an engagement position where the locking projection engages with the use position engaging portion, and an engagement position where the locking projection is moved from the use position engaging portion to the diameter when the needle cover is displaced from the use position to the protective position. It is preferable that the locking projection is elastically deformable so as to be displaced between a disengaged position in which it disengages inward in a direction.
[0067]
In this case, it is preferable that the needle cover further has a protective position engaging portion that engages with the locking projection at the protective position.
[0068]
In this way, the needle cover is restrained from being displaced from the protection position to the use position after use.
[0069]
As described above, according to the syringe with safety mechanism according to the other aspect of the present invention, the needle cover is regulated from sliding to the protective position before the needle cap is removed.
Code explanation
[0070]
1 Syringe with safety mechanism, 100 Syringe, 110 Barrel main body, 120 Needle holding part, 122 Tip part, 200 Needle, 300 Needle cap, 310 Open end (support part), 400 Holder, 410 Enveloping cylinder, 420 Neck part, 430 Engagement Stop cylinder, 431 second wall portion, 431a receiving portion (regulating portion), 432 first wall portion, 432A first wall portion, 432B first wall portion, 433 locking portion, 434 flexible piece, 434a receiving portion (regulating portion) part), 435 locking projection, 440 guide projection (projection), 500 needle cover, 510 cover body, 511 usage position engaging portion, 512 protection position engaging portion, 513 guide groove, 513a guide surface, 513b contact surface (restriction portion), 520 bulging portion (protruding portion), 521 first longitudinal rib (protruding portion), 522 second longitudinal rib (protruding portion).
The scope of the claims
[Claim 1]
"Syringe and
A needle connected to the tip of the syringe,
a holder fixed to the syringe,
a needle cover that is relatively displaceable with respect to the syringe along the axial direction of the syringe from a use position that exposes the needle to a protection position that surrounds the needle,
The holder engages the needle cover at the use position from the radially inner side of the needle cover so that the needle cover is held at the use position, and the needle cover is held at the protection position. has a locking portion that locks from the inner side in the radial direction to the needle cover in the protective position,
At least one member of the holder and the needle cover has a projection projecting toward the other member of the holder and the needle cover, and the other member is adapted to move the needle cover from the protective position to the use position. A syringe with a safety mechanism, comprising a restricting portion that abuts on the projecting portion so as to restrict relative displacement of the syringe along the axial direction with respect to the syringe toward a position.
[Claim 2]
The holder has a guide protrusion that protrudes toward the needle cover,
The needle cover is provided with a guide groove that guides the guide protrusion when the needle cover is displaced from the use position toward the protection position,
The guide groove is
a guide surface having a shape that rotates the needle cover around the central axis of the syringe when the needle cover is displaced from the use position to the protection position;
a contact surface that contacts the guide protrusion when the needle cover is displaced along the axial direction from the protection position toward the use position,
The syringe with a safety mechanism according to claim 1, wherein the guide protrusion constitutes the projecting portion, and the contact surface constitutes the restricting portion.
[Claim 3]
The needle cover has a bulging portion that bulges toward the holder,
The holder faces the bulging portion of the needle cover in the protecting position in the axial direction, and the needle cover moves in the axial direction when the needle cover is displaced from the protecting position toward the use position along the axial direction. Having a receiving portion that abuts on the bulging portion,
The syringe with a safety mechanism according to claim 1, wherein the bulging portion constitutes the projecting portion, and the receiving portion constitutes the restricting portion.
[Claim 4]
The holder has a guide protrusion that protrudes toward the needle cover,
The needle cover is provided with a guide groove that guides the guide protrusion when the needle cover is displaced from the use position toward the protection position,
The guide groove has a guide surface having a shape that rotates the needle cover around the central axis of the syringe when the needle cover is displaced from the use position to the protection position. death,
The said holder
The bulging portion of the needle cover in the use position is formed at a position facing the needle cover in the radial direction, and the needle cover moves from the use position to the protection position toward the central axis of the syringe. a first wall that allows displacement while rotating about;
A second needle cover provided adjacent to the first wall in the same direction as the needle cover rotates about the central axis of the syringe when the needle cover is displaced from the use position to the protection position. a wall, and
The syringe with a safety mechanism according to claim 3, wherein the tip portion of the second wall portion in the direction from the use position to the protection position of the needle cover constitutes the receiving portion.
[Claim 5]
The holder further has a first wall different from the first wall,
The locking portion is adjacent to the other first wall portion in the same direction as the needle cover rotates about the central axis of the syringe when the needle cover is displaced from the use position to the protection position. is positioned to
The bulging portion is
When the needle cover is located at the use position, the first wall faces the needle cover in the radial direction, and when the needle cover is located at the protection position, the second wall and the shaft are arranged. first longitudinal ribs facing in directions;
When the needle cover is positioned at the use position, the other first wall faces the needle cover in the radial direction. axially opposed second longitudinal ribs;
The syringe with a safety mechanism according to claim 4, wherein the distal end portion of the locking portion in the direction in which the needle cover faces from the use position to the protection position constitutes the receiving portion.
[Claim 6]
the guide groove further has a contact surface that contacts the guide projection when the needle cover is displaced along the axial direction from the protection position toward the use position,
The syringe with a safety mechanism according to claim 4 or 5, wherein the guide protrusion constitutes the projecting portion, and the contact surface constitutes the restricting portion.
[Claim 7]
further comprising a needle cap that is attached to the syringe so as to cover the needle and that can be removed from the syringe,
The needle cover is displaceable relative to the syringe from the use position toward the protection position in a state in which the needle cap is removed from the syringe,
the locking portion is elastically deformable so as to bend inward in the radial direction so as to allow the needle cover to move from the use position to the protection position;
2. The safety according to claim 1, wherein the needle cap has a support portion that supports the locking portion from the inside in the radial direction so as to restrict the locking portion from bending inward in the radial direction. Syringe with mechanism.
[Claim 8]
The syringe with a safety mechanism according to claim 7, wherein slits extending in a direction parallel to the axial direction of the syringe are formed on both sides of the locking portion of the holder in the circumferential direction of the holder.
[Claim 9]
The locking part is
a flexible piece having a shape extending in a direction parallel to the axial direction of the syringe;
a locking projection having a shape projecting outward in the radial direction from the flexible piece,
The needle cover has a use position engaging portion that engages with the locking protrusion at the use position,
The flexible piece has an engagement position where the locking projection engages the use position engaging portion when the needle cover is positioned at the use position, and an engagement position where the needle cover moves from the use position to the protection position. 9. The locking projection is elastically deformable so as to be displaced between a disengagement position in which the locking projection disengages radially inwardly from the use position engaging portion when displaced. A syringe with a safety mechanism as described.
[Claim 10]
The syringe with a safety mechanism according to claim 9, wherein the needle cover further has a protective position engaging portion that engages with the locking protrusion in the protective position.