WO2010081346A1

WO2010081346A1 - Low residue safety self-destroying syringe

Info

Publication number: WO2010081346A1
Application number: PCT/CN2009/074842
Authority: WO
Inventors: 林作钱
Original assignee: Lin Zuoqian
Priority date: 2008-12-30
Filing date: 2009-11-06
Publication date: 2010-07-22
Also published as: CN101444649B; CN101444649A

Abstract

A low residue safety self-destroying syringe includes a hollow needle cylinder (1), a push rod (2) sliding in the needle cylinder (1) and a rubber plug (3) arranged at the front end of the push rod (2), a needle seat (4) arranged at the front end of the needle cylinder (1), the needle seat (4) is supported by a supporting seat (5). Elastic claws (6) are arranged at the inside of the supporting seat (5), a frustum (8) engaged with the elastic claws (6) is arranged at the front end of the push rod (2). The rubber plug (3) is hollow, a stop (10) pushing the rubber plug (3) is arranged on the push rob (2). Before injection, the cone bottom of the frustum (8) encounters the top of the rubber plug (3). During the injection, the rubber plug (3) is compressive deformed by the reaction force generated by the injection and the thrust of the stop (10), then the frustum (8) is protruded along the axis of the push rod (2). After the injection, the frustum (8) is engaged with the elastic claws (6).

Description

Low residue safe self-destructing syringe

Technical field

The present invention pertains to a medical device, and in particular to a disposable, self-destructing syringe.

Background technique

Syringes are an indispensable tool for medical treatment. In order to avoid cross-contamination of blood, today's syringes use disposable products, but such disposable syringes can be reused if they are not artificially destroyed. Disposable syringes have been reused to cause cross-contamination, spread diseases, and many syringes have emerged. For example, the push rod is provided with a snap-fit member that engages with the syringe. When the injection is completed, the push rod is engaged with the syringe, so that the push rod is locked in the syringe and cannot be used again, thereby achieving the purpose of self-destruction, but this The type of syringe is not on the zero line before the pumping (blood) (ie, the piston is not pushed to the bottom), so the use of liquid (especially in blood draw) causes the liquid (blood) dose to be non-standard. On the other hand, when the syringe is not in use, the air in the syringe remains more. The tip of the pusher of this type of syringe is higher than the rubber plug. When the liquid is pumped, bubbles are generated at the top of the rubber plug, especially like an insulin syringe. In such small-dose syringes, it is more difficult to discharge the bubbles. In addition, after the injection of such syringes, the injection remains, and the low residue standard cannot be achieved. Summary of the invention

The technical problem to be solved by the present invention is to provide a low-residue safety self-destructing syringe which is pushed to the end with the front end on the zero line and does not generate bubbles at the top of the rubber plug.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A low-residue safety self-destructing syringe includes a hollow syringe, a push rod sliding in the syringe, a rubber plug installed at the front end of the push rod, a needle holder mounted on the front end of the syringe, and the needle holder supported by the support base An elastic claw is arranged on the inner side of the support seat, and a front end of the push rod is provided with a frustum that engages with the elastic claw after the injection is completed, wherein: the cone bottom of the frustum is in contact with the top of the rubber plug when not injected, The rubber plug is hollow, and the push rod is provided with a stopper that pushes against the rubber plug, and the glue is injected. The plug is compressed by the reaction force generated by the injection and the thrust of the stopper. At this time, the frustum at the front end of the push rod extends forward in the axial direction of the push rod, and the frustum can be engaged with the elastic claw after the injection.

After adopting the above structure: Since the cone bottom of the pusher frustum is not in contact with the top of the rubber plug when not injected, the height of the frustum is short, the liquid does not generate bubbles at the top of the rubber plug, and the exhaust gas is unobstructed after the liquid is pumped. Unobstructed, the amount of residual injection in the syringe after injection is small, especially suitable for small dose syringes such as insulin syringes.

In order to solve the above technical problem, the present invention adopts the following further technical solution: the lower end of the needle seat is formed with a first elastic supporting claw, and the inner wall of the needle barrel is provided with a card slot into which the first elastic supporting claw can be inserted, and the outer side of the upper end of the supporting seat Pressing the inner side of the first elastic claw, a connecting piece with an injection liquid through hole is installed in the needle seat, and the first step is provided at the upper end of the connecting piece, and correspondingly, the inner side of the needle seat is provided with a second step which is matched with the first step The lower end of the connecting member is formed with a supporting leg extending into the supporting seat. The inner side of the supporting seat is provided with an inner boss which cooperates with the supporting leg to drive the connecting member to slide downward, and the corresponding supporting leg is provided with a groove into which the inner protruding portion can be embedded.

Due to the above structure, the connecting member is installed in the needle holder, and the space in the needle seat is filled, so that the air remaining in the needle portion is less, and the injection liquid can be completely injected after the injection, and there is no residue. Push the lever down forcefully, the support seat slides down, the support seat drives the connecting member to slide down, and the connecting member pulls the needle seat to retract inside the syringe.

In order to solve the above technical problem, the present invention adopts the following further technical solution: the push rod is provided with a round table, and the round table is provided with an elastic pawl extending obliquely to the inner wall of the barrel, and the end of the barrel is provided with an enlarged diameter portion a slanting step is provided at a transition portion between the non-diameter enlarged portion and the enlarged diameter portion of the syringe, and a groove in which the elastic pawl can be engaged when the pull-down push rod is disposed under the inclined step is provided in the enlarged diameter portion The retaining ring at the bottom of the round table.

With the syringe of the above structure, since the end of the syringe is provided with an enlarged diameter portion, the self-locking mechanism can be disposed at the rear end of the syringe, the push rod is provided with an elastic pawl extending toward the inner wall of the syringe, and the elastic pawl is pulled down when the push rod is pulled down. The groove is inserted into the groove, and the inclined step above the elastic pawl prevents the push rod from moving upward. The retaining ring under the elastic pawl abuts against the bottom of the pusher round table to prevent the push rod from moving downward. The elastic pawl is in the radial direction due to the action of the groove. Also can't move, to achieve the purpose of locking the putter.

DRAWINGS Figure 1 is a cross-sectional view showing the state in which the push rod is mounted;

Figure 2 is a cross-sectional view showing the state in which the push rod is installed;

Figure 3 is a partial enlarged view of Figure 2;

Figure 4 is a cross-sectional view of the pumping state;

Figure 5 is a cross-sectional view showing the state of completion of injection;

Figure 6 is a cross-sectional view showing the state in which the needle begins to retract;

Figure 7 is a cross-sectional view showing the state of self-destruction;

Figure 8 is a partial enlarged view of Figure 4;

Figure 9 is a partial enlarged view of Figure 7;

Figure 10 is a cross-sectional view of the rubber plug;

Figure 11 is a cross-sectional view of the support base;

Figure 12 is a cross-sectional view of the connector;

Figure 13 is a schematic structural view of a retaining ring;

Figure 14 is a cross-sectional view of Figure 13;

Figure 15 is a cross-sectional view of the push rod;

Figure 16 is a cross-sectional view of the syringe;

Figure 17 is a partial enlarged view of Figure 16

Figure 18 is a cross-sectional view of the rubber stopper shown in the second embodiment;

Figure 19 is a partial enlarged view of the syringe shown in the second embodiment.

detailed description

Embodiment 1:

Referring to Figures 1, 2 and 3, the present invention comprises a hollow cylinder 1, a push rod 2 sliding in the barrel, a rubber plug 3 mounted on the front end of the push rod, and a needle holder 4 mounted on the front end of the barrel 1. The needle holder 4 is supported by the support base 5, and the lower end of the support base 5 has an interference fit with the inner wall of the syringe. The inner side of the support base 5 is provided with an elastic claw 6, and the front end of the push rod 2 is connected with a cone through the core 7 of the rubber plug 3. The table 8 and the frustum 8 are engaged with the elastic claws 6 after the injection is completed.

When the needle is not injected, the cone bottom of the front end frustum 8 is in contact with the rubber plug top 3, and the rubber stopper 3 is hollow (see FIG. 10). In the embodiment, the hollow plug 9 is formed in the cavity of the rubber plug 3, The push rod is provided with a stopper 10 that pushes against the rubber plug, and the stopper 10 also functions as a fixed rubber plug. For example, the stopper 10 is disposed in the hollow cavity and located below the hollow boss 9, and the stopper 10 abuts against the bottom of the hollow boss 9. When the injection is injected, the reaction force generated by the injection solution and the thrust of the stopper 10 are compressed and deformed. At this time, the frustum 8 at the front end of the push rod extends forward in the axial direction of the push rod, and the frustum 8 can be coupled with the elastic claw 6 after the injection is completed. Engage (see Figure 9). The lower end of the needle hub 4 is formed with a first elastic claw 11 , and the inner wall of the needle cylinder is provided with a card slot 12 into which the first elastic claw 11 can be embedded.

(see FIG. 16), the outer side of the upper end of the support base 5 is pressed against the inner side of the first elastic claw 11 , and the outer side of the upper end of the support base 5 is interference-fitted with the inner side of the first elastic claw 11 , and a connecting member 13 is mounted in the needle seat 4 . The connecting member 13 is provided with an injection liquid through hole communicating with the needle, and the upper end of the connecting member 13 is provided with a first step 14 (see FIG. 12), and correspondingly, the inner side of the needle seat 4 is provided with a matching position with the first step 14. The second step 15 is formed with a leg 16 extending into the support base 5 at the lower end of the connecting member 13. The inner side of the support base 5 is provided with an inner boss 17 which is closely matched with the leg 16 to drive the connecting member 13 to slide down (see Fig. 11). Above the corresponding leg 16 is provided a slot 18 into which the inner boss 17 can be inserted (see Fig. 12).

Referring to Fig. 9, Fig. 15, Fig. 16, the push rod 2 is provided with a round table 19 below the rubber plug 3. The round table 19 is provided with an elastic pawl 20 extending obliquely to the inner wall of the barrel. The bottom surface of the round table 19 is smaller than the round table. a cylinder 191 of 19, the end of the barrel is provided with an enlarged diameter portion 21, and at the transition of the non-diameter enlarged portion 22 and the enlarged diameter portion 21, a slanted step 23 is provided, and a pull-down push rod is provided below the inclined step 23. When the elastic pawl 20 can be engaged with the recess 24 (see Fig. 17), the enlarged diameter portion 21 is provided with a retaining ring 25 which can abut against the bottom of the truncated cone 19 (see Fig. 9, Fig. 13, Fig. 14), the retaining ring At the upper end of 25, there is a round table that can be gathered toward the center.

(19) The second elastic claw 26 at the bottom. The width of the elastic pawl 20 is greater than the spacing 261 of the retaining ring pawl. The outer diameter of the truncated cone 19 is less than or equal to the minimum inner diameter of the helical step 23 of the barrel, and is greater than the minimum inner diameter of the retaining ring 25 at the tip of the second resilient strut 26 . The number of the elastic pawls 20 is at least two and symmetrically arranged, preferably four and symmetrically disposed, and the distance between the symmetric two claw tips is smaller than the inner diameter of the syringe non-diameter increasing portion 22, which is larger than the inner cylindrical inclined step 23 The minimum inner diameter of the pawl of the elastic pawl 20 increases obliquely toward the front end of the syringe.

Referring to Fig. 17, the groove 24 is a circular groove in the circumferential direction, and the upper end surface 91 is an oblique angle or a plane extending from the inside to the outside and in the direction of the head of the elastic pawl 20, and the side wall 92 is The diameter is greater than the distance between the claw tips of the symmetric elastic pawl 20.

Referring to FIG. 8 and FIG. 9, the retaining ring 25 is dynamically matched with the inner wall of the enlarged diameter end portion 21 of the syringe, and can move up and down in the axial direction without coming out of the syringe, and the moving distance thereof is greater than the elastic pawl 20 on the push rod 2. The tip of the ring to the bottom of the truncated cone 19 is added with the distance of the length of the inclined step 23 of the syringe. The inner diameter of the upper end of the retaining ring 25 at the claw tip of the second elastic strut 26 is larger than the outer diameter of the push rod cylinder 191, and the upper end of the retaining ring 25 can abut the round table. 19 bottom. The inner ring of the retaining ring 25 is provided with a slope 27 (Fig. 14). When the push rod is installed, the elastic pawl 20 can move up along the inclined surface 27 and gather inwardly, and the circular table 19 can support the second elastic claw 26 of the retaining ring 25. Squeeze in. The inner wall of the needle end diameter increasing portion 21 is provided with a large groove 61 (Fig. 16, Fig. 17) which is matched with the retaining ring 25, and the upper end 62 can be engaged with the upper end 121 of the retaining ring 25 in the concave The lower end of the groove 61 is provided with a flange step 28 (see Fig. 16), and the outer ring of the upper end of the retaining ring 25 is provided with a flange 29 (see Fig. 14), and the flange step 28 is in contact with the bottom end surface 122 of the flange 29, and the step 28 The retaining ring 25 is prevented from slipping out of the barrel.

Referring to FIG. 7 and FIG. 9, when the injection is completed, the push rod 2 is pulled to move toward the bottom of the syringe, and the bottom plane of the circular table 19 on the push rod 2 hits the second of the retaining ring 25 installed inside the syringe 1. The top end of the elastic brace 26, so that the inner diameter is smaller than the outer diameter of the round table 19, is larger than the outer diameter of the push rod cylinder 191, thereby driving the retaining ring 25 to move downward, continuing to pull the push rod 2 downward, the elastic pawl 20 and the oblique The upper inclined surface 81 (see FIG. 17) of the step 23 is in contact with, and under the action of the inclined surface 81, elastic deformation is generated in the direction of the center portion of the push rod, and the inner diameter of the inclined step 23 is minimized as the push rod moves downward, and the elasticity is elastic. After the pawl 20 passes the minimum inner diameter of the inclined step 23, it returns to its original natural state by its own elasticity, and the claw tip of the elastic pawl 20 is caught in the groove 24 below the inclined step 23, and when the push rod 2 continues to move downward, The bottom end surface 122 of the upper end flange 29 of the retaining ring 25 is in contact with the inner wall flange step 28 of the syringe end diameter increasing portion 21, preventing the push rod from moving downward, and if there is a certain external force pushing the push rod in the injection direction, due to the elasticity spine 20 play the role to prevent the action of the groove 24, the groove 24 side wall 92 can prevent the elastic ratchet reversing the direction of the barrel wall, the purpose of locking the push rod.

When the present invention is used, first, as shown in FIG. 1, this is a state in which the push rod 2 is mounted in the syringe, and the elastic pawl 20 on the push rod 2 moves upward along the inclined surface 27 of the retaining ring 25, The time retaining ring 25 moves up along the inner wall of the barrel, and the elastic pawl 20 gathers inwardly under the compression of the second elastic claw 26 of the retaining ring; as shown in FIG. 2, the elastic pawl 20 is under the action of the retaining ring 25. Smoothly entering the non-diameter increasing portion 22 of the barrel through the inclined step 23, the round table 19 also presses the second leg 26 of the retaining ring 25 into the non-diameter increasing portion 22 of the barrel, as shown in FIG. Pumping state; as shown in Fig. 5, the injection is completed at this time; the inertia of the thrust continues to push forward against the push rod 2 at this time, at this time the stopper 10 compresses the hollow boss 9 in the axial direction of the push rod to make the front end of the push rod The frustum 8 extends forwardly and engages with the elastic claw 6; as shown in FIG. 6, the push rod is pulled downward, and the support base 5 slides down, so that the first elastic claw 11 on the needle seat is separated from the inner wall of the syringe. At this time, the support base 5 drives the connecting member 13 to slide down and is restrained by the first step 14 and the second step 15. The connecting member 13 pulls the needle seat to retract inside the syringe, and the needle holder 4 is separated from the syringe, as shown in FIG. As shown, the push rod is pulled down, the needle holder 4 is retracted, and the elastic pawl 20 slides down the inclined step 23, at which time the elastic pawl 20 snaps into the recess 24 below the inclined step 23. Inside, the putter 2 is locked and self-destruction is completed.

Embodiment 2:

The structure of the syringe except the rubber stopper shown in this embodiment is different from that of the first embodiment, and the rest of the structure is the same.

Referring to Fig. 18 and Fig. 19, the rubber plug 3' in this embodiment is also hollow, and the difference is that: a rubber ring has a ring 9' formed under the rubber plug, and the stopper 10 is located below the flange 9', and is convex. The edge 9' is offset, and the core 7 of the push rod is provided with a second stopper 10', and the second stopper 10' is located in the hollow cavity of the rubber stopper 3' and is adjacent to the flange 9'. There is a large gap between the inner wall of the rubber plug 3' and the core 7, that is, the wall of the rubber stopper 3' is relatively thin, and the rubber stopper is compressed by the reaction force generated by the injection liquid and the thrust of the stopper 10 during injection. Due to the action of the second stopper 10', only the rubber plug located at the upper portion of the second stopper 10' is recessed toward the inside, and the second stopper 10' also functions as a fixing rubber stopper at the time of liquid suction, and also due to the thrust Inertia, at this time, the frustum 8 at the front end of the push rod extends forward in the axial direction of the push rod, and the frustum 8 can be engaged with the elastic claw 6 after the injection.

Claims

1. A low-residue safety self-destructing syringe comprising a hollow syringe (1), a push rod (2) sliding in the syringe (1), and a rubber plug installed at the front end of the push rod (2) (3) The needle holder (4) is mounted on the front end of the syringe (1), the needle seat is supported by the support base (5), and the elastic claw (6) is arranged on the inner side of the support base (5), and the front end of the push rod is provided after the injection is completed. a frustum (8) that is engaged with the elastic claw (6), characterized in that: the cone bottom of the frustum (8) is in contact with the top of the rubber plug when not injected, and the rubber plug is hollow, on the push rod There is a stopper (10) pushed against the rubber stopper, and the rubber stopper is compressed by the reaction force generated by the injection liquid and the thrust of the stopper (10) during injection, and the frustum (8) at the front end of the push rod is along the push rod. The axial direction is extended, and the frustum (8) can be engaged with the elastic claw (6) after the injection.

2. The low-residue self-destructing syringe according to claim 1, wherein: the hollow cavity of the rubber plug is formed with a hollow boss (9), and the stopper (10) is disposed in the hollow cavity. It is located below the hollow boss (9), and the stopper 10 abuts against the bottom of the hollow boss 9.

3. A low-residue self-destructing syringe according to claim 1, wherein: a lower flange (9') is formed in the lower portion of the rubber plug, and the stopper (10) is located on the flange (9'). ) below, and against the flange (9'), the second block is provided on the core (7) of the push rod

(10'), the second stop (10' M stands in the hollow cavity of the rubber plug and is close to the flange (9').

4. A low-residue self-destructing syringe according to claim 1 or 2 or 3, wherein: the lower end of the needle holder is formed with a first elastic claw (11), and the inner wall of the barrel is provided with a first elasticity a clamping groove (12) into which the claw (11) can be inserted, an outer side of the upper end of the supporting base (5) pressing against the inner side of the first elastic supporting claw (11), and a connecting piece with an injection liquid through hole is installed in the needle seat (13) The upper end of the connecting member (13) is provided with a first step (14), and correspondingly, the inner side of the needle seat is provided with a second step (15) which is matched with the first step (14), and the lower end of the connecting member (13) is formed with The support leg (16) extends into the support seat (5), and the inner side of the support base (5) is provided with an inner boss (17) which cooperates with the support leg (16) to drive the connecting member (13) to slide down, and the corresponding support leg (16) There is a groove (18) in which the inner boss (17) can be embedded.

5. A low-residue self-destructing syringe according to claim 1 or 2 or 3, characterized in that: the push rod (2) is provided with a round table (19), and the round table (19) is provided with a needle An elastic pawl (20) extending at an oblique angle of the inner wall of the cylinder, the end of the syringe being provided with an enlarged diameter portion (21), which is provided at a transition portion between the non-diameter increasing portion (22) and the enlarged diameter portion (21) of the syringe barrel Elastic pawl (20) is available with a slanted step (23) and a slanted step (23) with a pull-down pusher underneath The recessed groove (24) and the enlarged diameter portion (21) are provided with a retaining ring (25) which can abut against the bottom of the round table (19).

6. A low-residue self-destructing syringe according to claim 5, wherein: said retaining ring (25) is movably coupled to the inner wall of the enlarged diameter end portion (21) of the barrel, and is movable along the axis of the push rod The needle is moved up and down without coming out of the barrel, and the upper end of the retaining ring (25) is provided with a second elastic claw (26) which is gathered toward the center and can abut against the bottom of the round table (19).

7. A low-residue self-destructing syringe according to claim 6, wherein: the inner diameter of the upper end of the retaining ring (25) at the tip of the second elastic claw is slightly smaller than the inclined step (23) of the syringe. The inner diameter of the retaining ring (25) is provided with a bevel (27). When the push rod is installed, the elastic pawl (20) can move up and down along the inclined surface (27), and the circular table (19) can hold the retaining ring ( 25) The second elastic claw (26) is pushed up and pushed in.

8. A low-residue self-destructing syringe according to claim 5, wherein: the inner wall of the enlarged diameter end portion (21) of the syringe is provided with a large circle that is matched with the retaining ring (25). The groove (61) has an upper end (62) that can be engaged with the upper end (121) of the retaining ring (25), and a flange step (28) at the lower end of the large groove (61), and the upper end of the retaining ring (25) The outer ring is provided with a flange (29), and the flange step (28) is in contact with the bottom end surface (122) of the outer flange (29).

9. A low residual safety self-destructing syringe according to claim 5, wherein: the outer diameter of the round table (19) of the push rod (2) is less than or equal to the minimum inner diameter of the inclined step (23) of the syringe. , a smaller inner diameter than the retaining ring (25) at the tip of the second resilient pawl.

10. A low residual safe self-destructing syringe according to claim 5, wherein: the number of the elastic pawls (20) is at least two and symmetrically arranged, and the distance between the symmetric two claw tips is smaller than the syringe The inner diameter of the non-diameter enlarged portion (22) is larger than the inclined step inside the syringe

(23) The minimum internal diameter at the location.

A low-residue self-destructing syringe according to claim 5, wherein the pawl of the elastic pawl (20) is inclined at an oblique angle toward the front end of the barrel.

12. A low residue safe self-destructing syringe according to claim 5, wherein: said elastic pawls (20) are four in number and arranged symmetrically.

13. A low-residue self-destructing syringe according to claim 5, wherein: said recess (24) is a ring of card slots, the upper end surface (91) of which is from the inside to the outside and along the elastic detent The bevel or plane extending in the direction of the head has a diameter at the side wall (92) that is greater than the distance between the symmetrical two pawl tips.