TW201334829A - Self-destructive insulin syringe - Google Patents

Abstract

The present invention relates to a self-destructive insulin syringe, which comprises a barrel, a plunger, a rubber plug, and a needle holder, and is characterized in that the barrel is configured with a coupling needle holder. The coupling needle holder is supported and fixed at the front end of the barrel by a support base. The needle holder is formed with a retaining ring by extending downwardly. The upper end of the coupling needle holder is formed with an engaging ring, in which the engaging ring is extended into the inner hole of the retaining ring and engaged with the engaging ring. The wall of the inner hole of the coupling needle holder is configured with a large groove. The upper end of the support base is extended into the inner hole of the coupling needle holder, and is formed with first resilient pawls converging toward the center. The outside of the upper end of the support base is configured with a circle flange, which is received in the large groove and is able to slide up and down along the large groove. The lower end of the coupling needle holder is formed with first resilient pawls, and the inner wall of the barrel is correspondingly configured with a small groove to be engaged with the first resilient pawls. The outside of the lower end of the support base is configured with a circle flange shoulder, and the flange shoulder is abutted ith the first resilient pawls. Due to the detachable connection between the needle holder and the barrel, the syringe employing the aforementioned structure may be replaced with needles of different specifications according to the requirement, and the needle holder may be retracted into the batter after injection.

Description

Self-destructing insulin syringe

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

With the improvement of people's living standards, the incidence of diabetes is on the rise. According to statistics, there are nearly 40 million people with diabetes in China. Studies have shown that early injection of insulin is beneficial to protect the function of islet β cells and prevent complications. Therefore, the most important means of treating diabetes is insulin injection. In order to avoid problems such as cross-infection caused by repeated use of insulin syringes, there are some self-destructing insulin syringes on the market, which are caused by deformation of the rubber plug after pushing the rubber plug at the end of the injection. The deformation of the rubber plug allows the push rod to continue to advance in the pushing direction, thereby starting the self-destruct mechanism and preventing the syringe from being used again.

However, in the prior art self-destructing insulin syringe, in order to continue the extension of the push rod to start the self-destruct mechanism at the end of the injection, the rubber plug has to be deformed greatly, causing laborious use and causing the patient's pain.

The technical problem to be solved by the present invention is to provide a self-destructing insulin syringe which, at the end of the injection, requires only a small force to activate the self-destructing mechanism. In order to solve the above technical problem, the present invention adopts the following technical solutions:

A self-destructing insulin syringe comprising a syringe, a push rod movable within the barrel, and a rubber plug mounted on the push rod and in contact with an inner wall of the barrel. The rubber plug is hollow, the bottom surface is open, and the top has an inner hole. The push rod includes a frustum, a tapered surface, and a stopper. The frustum is located at the forward end of the push rod and is configured to extend through the inner bore of the rubber plug to extend the top of the rubber plug for activating the self-destructing mechanism at the end of the injection. The stop is located below the frustum and is configured to deform by pushing against the bottom surface of the rubber plug upon completion of the injection, so that the frustum of the push rod continues to be advanced to activate the self-destruct mechanism. The stopper has a cross shape or a plurality of convex rib shapes.

Preferably, the push rod further comprises a tapered surface, the tapered surface being located below the frustum, configured to support the inner hole of the rubber plug without leaking when injected.

Since the stopper can be deformed by pushing against the bottom surface of the rubber plug at the time of completion of the injection, the rubber stopper and the stopper are simultaneously deformed, so that the push rod can be pushed with the force of the pusher to continue along the push rod with a small force. The axial extension extends to initiate the self-destruct mechanism and also alleviates the patient's pain.

The stopper on the push rod is designed to have a cross shape or a plurality of convex rib shapes, and can also effectively reduce the compression force of the stopper to the rubber plug, and prevent the compression deformation of the rubber plug from being serious. On the other hand, when a cross or a plurality of rib-shaped stoppers push the rubber stopper, a small force is used to cause the rubber plug to generate a desired deformation, thereby further reducing the advancement of the push rod. The force needed and the pain of the patient is alleviated.

Referring to Figures 1 and 2, 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 syringe 1 4 is detachable connection with the front end of the syringe. In this embodiment, the detachable connection is a threaded connection. Of course, other methods such as snapping may be used. A sheath 40 is mounted on the outer circumference of the head of the needle holder 4 to Prevent the needle from being damaged, injuring people and returning to the head of the needle holder after the injection, without leaking residual liquid.

Referring to Figure 11, the inner wall of the needle hub 4 is provided with a stop 33 for limiting the front end of the syringe. The needle holder 4 is provided with a needle holder 5 for mounting the needle. The needle holder 5 and the needle holder 4 are provided with a seal. The water O-shaped elastic sealing ring 6 prevents the injection liquid from leaking out of the syringe barrel, and the outer ring of the needle holder 5 is provided with at least three reinforcing ribs 30 along its axial direction (see FIGS. 14 and 15 ), and the reinforcing rib 30 and the needle seat 4 The inner ring cooperates with the fixed needle seat, and the needle base 5 is extended downward to form a fixing ring 9. The needle seat 5 is formed with a round table 32 in the fixing ring 9, and the round table 32 is provided with a pinhole, and the round table 32 ensures injection molding. When there is no bubble generation, and ensuring the firmness and verticality of the needle drop glue, the needle barrel is provided with a coupling needle seat 7 which cooperates with the needle seat 5, and the coupling needle seat 7 is provided with an inner hole through which the injection liquid passes, and the coupling needle seat 7 is supported by the support base 8 and fixed to the front end of the syringe. The upper end of the coupling needle base 7 is formed with a snap ring 10, and the snap ring 10 extends into the inner hole of the fixing ring 9 and is engaged with the fixing ring 9, and the inner wall of the fixing ring 9 is The outer wall of the snap ring 10 is tapered. When the snap ring 10 is assembled with the retaining ring 9, the inner hole of the snap ring presses the round table 32 inwardly to maintain a liquid seal between the two to prevent liquid leakage. . A latching groove 11 is formed on the outer side of the upper end of the snap ring 10. Correspondingly, the wall of the hole of the retaining ring is provided with a protrusion 12 corresponding to the slot 11 (see FIG. 14). A large groove 13 is defined in the hole wall of the inner hole of the coupling needle seat 7. The upper end of the support base 8 extends into the inner hole of the coupling needle seat 7, and is formed with a first elastic pawl 14 gathered toward the center, and the upper end of the upper end of the support base 8 is provided. There is a ring 15 having a boss 15 falling in the large groove 13 and sliding up and down along the large groove 13. The lower end of the coupling pin 7 is formed with a first elastic claw 16, and the number of the first elastic claws 16 is At least two. Correspondingly, the inner wall of the syringe is provided with a small recess 17 into which the first elastic claw can be inserted, and a support shoulder 18 is arranged on the outer side of the lower end of the support base 8. The shoulder 18 is opposite to the first elastic claw 16 to make the first The elastic claw 16 falls into the small groove 17 to fix the lower end of the coupling needle seat, and the support base 8 is pressed against the coupling needle seat 7 and the inner wall of the barrel to be fixed at the front end of the barrel.

Referring to Figure 12, the push rod 2 is provided below the rubber plug 3 with a round table 22, and the round table 22 is provided with a second elastic pawl 23 extending obliquely to the inner wall of the barrel, and the end of the barrel is provided with an increased diameter. Most of the 24, at the transition of the non-diameter increasing portion 25 of the syringe and the enlarged diameter portion 24, a slanting step 26 is provided, and a recess in which the second elastic pawl 23 can be engaged when the pull-down push rod is provided under the inclined step 26 27, the diameter increasing portion 24 is provided with a retaining ring 28 which can abut against the bottom of the truncated cone 22. The upper end of the retaining ring 28 is provided with a second elastic supporting claw 29 which is gathered toward the center and can abut against the bottom of the truncated cone 22. The pawl tip of the second elastic pawl 23 is inclined at an oblique angle toward the front end of the syringe, and the retaining ring 28 is movably matched with the inner wall of the enlarged diameter end portion 24 of the syringe, and is movable up and down in the axial direction, and the upper end of the retaining ring 28 can be pressed against the circle. The bottom of the table 22. When the injection is completed, the push rod 2 is pulled to move toward the bottom of the barrel, and the bottom plane of the round table 22 on the push rod 2 hits the top end of the second elastic claw 29 of the retaining ring 28 mounted inside the barrel 1. Therefore, the retaining ring 28 is moved downward, and the push rod 2 is continued downward. After the second elastic pawl 23 passes over the inclined step 26, the elastic state returns to the original natural state by itself, and the claw tip of the second elastic pawl 23 will The groove 27 under the inclined step 26 is caught to achieve the purpose of locking the push rod.

The self-destruct mechanism activated by the frustum of the front end of the push rod according to the present invention is described above. Other self-destructing mechanisms that can be activated by the cone at the front end of the push rod in the prior art are also suitable for the present invention.

Referring to FIG. 9, the push rod 2 is provided with a tapered surface 31 for supporting the inner hole of the rubber stopper 3. When the liquid is pushed, the rubber plug is compressed and deformed by the injection liquid to move the push rod 2 forward, and the tapered surface 31 supports the inner hole of the rubber plug. Produces a snug force to ensure that the positive pressure does not leak. The front end of the push rod 2 is connected to the frustum 20 through the core 19, and after the injection, the frustum 20 is engaged with the first elastic pawl 14, the rubber plug 3 is hollow, and the push rod 2 is provided with the bottom surface of the rubber plug 3. The stopper 21 and the stopper 21 also function as the fixing rubber stopper 3, and the front end of the rubber stopper is attached to the 0-bit line before the liquid is pumped, so that the standard of the liquid suction or the blood drawing capacity is protected from the exhaust. At the time of injection, the rubber stopper is compressed by the reaction force generated by the injection liquid and the thrust of the stopper 21, and the frustum 20 at the front end of the push rod is extended forward in the axial direction of the push rod, and the frustum 20 can be combined with the first elastic spine after the injection is completed. The claws 14 are engaged.

In order to reduce the compressive force of the stopper 21 to the rubber plug, the compression deformation of the rubber plug is not serious; on the other hand, in order to reduce the force required for the rubber stopper to continue to push the push rod after the end of the injection, the stopper 21 is configured to be completed when the injection is completed. The deformation is caused by pushing against the rubber stopper 3, and the rubber stopper 3 is simultaneously deformed by the pressure of the stopper 21. In the case where the stopper 21 and the rubber stopper 3 are both elastic bodies, the stopper interacts with the rubber stopper, and the two elastic bodies are connected in series. According to Hooke's law of elastic deformation, it can be easily known that after the two elastic bodies are connected in series, since the stiffness coefficient (elastic coefficient or stiffness coefficient) is reduced, the force required for the same deformation is generated as compared with the single elastic body. Reduced.

It will be understood by those skilled in the art that the deformation of the stopper 21 and the rubber stopper 3 may be elastic or inelastic.

Since the stopper 21 and the rubber stopper 3 interact and deform at the same time, when the injection is completed, only a small force is required to continue pushing the frustum 20 of the front end of the push rod forward in the axial direction of the push rod to start from the start. Destroy the institution.

The stopper 21 may be in the shape of a cross or a plurality of ribs (Figs. 10a to 10c), and the cross-shaped or a plurality of rib-shaped stoppers can reduce the contact area with the rubber plug (compared with the truncated cone shape). Achieve the purpose of reducing compression. On the other hand, using a small force can cause the rubber plug to produce the desired deformation.

It will be appreciated that the stop 21 may not be used to secure the rubber plug prior to completion of the injection, but will only push against the rubber stopper 3 when the injection is complete.

For syringes such as insulin syringes, at the end of the injection, the top of the gel plug is preferably located at the zero line, so that there is as little residual injection as possible in the syringe, or even no residual injection.

When the invention is used, firstly, as shown in FIG. 2, this is the state in which the push rod 2 is mounted in the syringe. At this time, the rubber stopper 3 has been pushed to the bottom, and the frustum 20 has not passed through the first elastic pawl 14, such as As shown in Fig. 3, this is the pumping state; as shown in Fig. 4, when the injection is completed, the inertia of the thrust continues to push forward against the push rod 2 at this time, and at this time, the stopper 21 compresses the rubber along the axial direction of the push rod. Plugging, the frustum 20 at the front end of the push rod is extended and engaged with the first elastic pawl 14; as shown in FIG. 5, the push rod is pulled downward, and the frustum 20 pushes against the first elastic pawl on the support base. 14 driving the support base 8 to slide down, so that the first elastic supporting claw 16 on the coupling needle seat is disengaged from the inner wall of the syringe barrel, and the supporting seat 8 is restrained by the outer boss 15 and the lower step of the coupling needle large groove 13 Bit (see Fig. 13), as shown in Fig. 6, continue to pull down the push rod, the support seat 8 drives the coupling needle seat 7, and the coupling needle seat 7 drives the needle holder 5 to slide down, and the needle is retracted into the syringe, as shown in Fig. 7. As shown, the push rod is further pulled down, and the second elastic pawl 23 slides down the inclined step 26, at which time the second elastic pawl 23 snaps into the recess 27 below the inclined step 26 (see Fig. 12), and the push rod 2 is lock . As shown in Fig. 8, the push rod is broken by force, the self-destruction is completed, and the sheath 40 of the needle holder is immediately placed to prevent the residual liquid from leaking.

1. . . Syringe

2. . . Putt

3. . . Rubber stopper

4. . . Needle seat

5. . . Needle holder

6. . . O-type elastic seal

7. . . Coupling hub

8. . . Support base

9. . . M

10. . . Clasp

11. . . Card slot

12. . . Bulge

13. . . Large groove

14. . . First elastic pawl

15. . . Boss

16. . . First elastic claw

17. . . Small groove

18. . . Shoulder shoulder

19. . . Card core

20. . . Frustum

twenty one. . . Stoppers

twenty two. . . Round table

twenty three. . . Second elastic pawl

twenty four. . . Increased diameter

25. . . Non-diameter increasing portion

26. . . Oblique step

27. . . Groove

28. . . Retaining ring

29. . . Second elastic claw

30. . . Rib reinforcement

31. . . tapered surface

32. . . Round table

33. . . Stop

40. . . jacket

Figure 1 is a schematic structural view of the present invention;

Figure 2 is a cross-sectional view showing the syringe in an unused state;

Figure 3 is a cross-sectional view of the pumping state;

Figure 4 is a cross-sectional view showing the state in which the injection is completed;

Figure 5 is a cross-sectional view showing the state in which the needle begins to retract;

Figure 6 is a cross-sectional view showing the state in which the needle is retracted into the syringe;

Figure 7 is a cross-sectional view showing the push rod being locked;

Figure 8 is a schematic view showing the state of self-destruction;

Figure 9 is a schematic structural view of the push rod;

10a to 10c are cross-sectional views taken along line A-A of Fig. 9;

Figure 11 is a partial enlarged view of Figure 2;

Figure 12 is a partial enlarged view of Figure 7;

Figure 13 is a partial enlarged view of Figure 5;

Figure 14 is a schematic structural view of a needle holder;

Figure 15 is a top plan view of the needle hub.

5. . . Needle holder

6. . . O-type elastic seal

7. . . Coupling hub

8. . . Support base

9. . . M

10. . . Clasp

11. . . Card slot

12. . . Bulge

13. . . Large groove

14. . . First elastic pawl

15. . . Boss

16. . . First elastic claw

17. . . Small groove

18. . . Shoulder shoulder

19. . . Card core

20. . . Frustum

twenty one. . . Stoppers

30. . . Rib reinforcement

32. . . Round table

33. . . Stop

Claims (2)

A self-destructing insulin syringe comprising a syringe (1), a push rod (2) movable within the syringe (1), and a push rod (2) mounted on the push rod (2) and the syringe (1) a rubber plug (3) contacting the inner wall, wherein the rubber stopper (3) is hollow, the bottom surface is open, the top of the rubber stopper (3) has an inner hole; and the push rod ( 2) comprising: a frustum (20) located at the front end of the push rod (2) for starting a self-destruct mechanism, the frustum (20) being configured to pass through the inner hole of the rubber plug (3) And protruding from the top of the rubber plug (3); a stopper (21) located below the frustum (20), the stopper (21) being configured to push the rubber stopper through the injection when the injection is completed The bottom surface of (3) is deformed, and the frustum (20) of the push rod (2) is further advanced to start the self-destruct mechanism, wherein the stopper (21) has a cross shape or a plurality of convex rib shapes. . The self-destructing insulin syringe according to claim 1, wherein the push rod (2) further comprises a tapered surface (31) under the frustum (20), the tapered surface ( 31) is configured to support the inner bore of the rubber plug (3) without leakage while supporting.