CN100418590C - Needle retraction device for safety syringe - Google Patents

Abstract

A needle retracting device for a safety injection syringe, the injection syringe comprises an outer cylinder and an inner rod assembled in the outer cylinder, the retracting device comprises a connecting seat, one end of the connecting seat forms a protruding small tube for engaging the injection needle, and a flow channel is arranged in the inner axial direction of the protruding small tube, the other end of the connecting seat forms a fitting portion, the fitting portion comprises a plurality of lever springs, one end of each of the lever springs of the fitting portion is in abutment with the inner cavity of the outer cylinder; the inner rod is pushed forward to release the configuration in which the other end of each lever spring is in abutment with the inner cavity of the outer cylinder, and the inner rod is combined with the connecting portion for locking, so that when the inner rod retreats, it can synchronously drive the connecting seat and the injection needle to retract into the inner cavity of the outer cylinder, so as to prevent the injection needle from pricking other people, and the device has the advantages of simple structure and convenient operation.

Description

Needle retraction device for safety syringes

【Technical field】

The invention relates to a safety injection syringe, in particular to an injection needle retracting device of the safety injection syringe.

【Background technique】

Generally, the composition of the injection barrel includes an outer cylinder with a hollow structure, and a set of inner rods fitted in the outer cylinder. One end of the outer cylinder can be combined with the injection needle, and one end of the inner rod is exposed from the outer cylinder. In this way, when the inner rod is pushed, the liquid (such as medicine) contained in the inner cavity of the outer cylinder can be output by the injection needle.

Since the general injection syringe does not have the function of accommodating the injection needle, the needle cover must be put back on the injection needle, and then the injection needle must be taken out. Since it is necessary to engage the injection needle and the needle cover, it is easy to cause needle sticks to endanger other people due to careless operation.

In order to solve the problem of disposal of injection needles after use, US Patent No. 5,019,044 provides a design of a safety syringe. This patent has two important features, one of which is to lock a clamping means in the outer cylinder (barrel), the clamping device has a clamping element (clamping means) that can clamp a connection seat, and the A spring is arranged between the seat and the clamping device, and the two ends of the spring are respectively abutted against the end surface of the connecting seat and the end surface of the clamping element. And another feature is to be provided with a rubber plug (rubber plug) on the end face of the hollow inner rod, and this rubber plug corresponds to the connecting seat.

When the user pushes the inner rod towards the connecting seat, the connecting seat and the rubber stopper will be displaced by mutual force, and at this time, the spring will generate a restoring force due to the compressed force. When the end face of the inner rod pushes away the clamping element, the connecting seat will lose the restriction of the clamping element, and with the restoring force of the spring, the combination of the connecting seat and the injection needle will push away the rubber stopper and fall into the hollow Inside the inner rod.

In addition, U.S. Patent No. 6,066,115 discloses a safety syringe, which is assembled with a connecting seat at one end of an outer cylinder, and the bottom of the needle set (needle set) is provided with an elastic sheet with a barb structure. And one end of an inner rod is provided with a protruding post, and the end of the protruding post is formed with a tapered head. When the inner rod is pushed toward the connecting seat, the tapered head can enter the bottom of the connecting seat and form a hook shape with the elastic sheet, and then pull the inner rod out of the outer cylinder, and the The connecting seat and the needle are pulled toward the inner cavity of the outer cylinder together.

In addition, U.S. Patent No. 6,712,788B2 discloses two structural features, one of which is that a needle base is inserted in a supporting body, and one end of the needle base is formed with a long tongue and a short tongue. Tongue, and another feature is that the end face of the inner rod is provided with an open seat (open cylindrical seat). The above-mentioned short tongue is used to combine with the carrier, while the long tongue enters into the opening seat when the inner rod is pushed toward the needle hub, and engages with the ridge inside the opening seat. In this way, when the inner rod is pulled out of the outer cylinder, the needle base and the needle will be pulled into the inner chamber of the outer cylinder together.

Taiwan Patent No. 590017 describes a safety syringe, which is provided with a barb-shaped clamping portion at the front end of a needle holder, and several sheet-shaped joints are provided at the rear end of the needle holder. A ring groove is formed at the front end of the piston rod. A stop ring is arranged on the inner wall of the outer cylinder. When the piston rod is pushed forward to the needle seat, the joint part is inserted into the groove of the ring and tightened to clamp the piston rod, and then the piston rod can be rotated so that the needle seat can rotate together, and the locking The portion is gradually converged and separated from the stop ring, so that the piston rod can be pulled out, and the needle seat and the needle can be pulled into the outer cylinder together.

From the above patents, it can be seen that pulling the connecting seat and the needle into the inner cavity of the outer cylinder is the mode of designing a safe syringe, and the technologies used in each patent are different. To sum up, both the U.S. Patent No. 5,019,044 and the Taiwan No. 590017 case release the positioning of the connecting seat when the inner rod (piston rod) is close to the end surface of the connecting seat. In the former, the clamping element is pushed by the inner rod, and in the latter, the clamping effect between the clamping part and the stop ring is released by rotating the piston rod. And when the former inner rod is not pulled outwards, the spring recovery force is used to break through the rubber plug at the front end of the inner rod, so that the connecting seat and the needle head fall into the inner rod. The latter is clamped at the end of the piston rod by the joint part on the connecting seat, and the connecting seat and the needle are pulled into the outer cylinder when the piston rod is pulled out.

U.S. Patent No. 6,066,115 and U.S. Patent No. 6,712,788 B2 both push the inner rod to the bottom surface of the connecting seat so that the inner rod and the connecting seat can be combined in a hooked manner, and then directly pull the inner rod outward to force The connecting seat and the needle drop into the outer cylinder. In these two patent cases, there is no operation action to release the positioning of the connecting seat in advance.

The above patents have the disadvantages of complicated structure and inconvenient operation.

【Content of invention】

One of the objectives of the present invention is to provide an injection needle retracting device for a safety injection syringe, which can retract the connecting seat and the injection needle during the retraction operation of the inner rod after the injection syringe is used. It is retracted into the cavity of the outer cylinder to avoid the injection needle from being pierced by the user or other surrounding persons or objects, and has the advantages of simple structure and convenient operation.

The second object of the present invention is to provide an injection needle retracting device for a safety injection syringe, which has a connecting seat of a lever shrapnel, one end is engaged with the injection needle, and the other end is engaged with the stop ring provided in the inner cavity of the outer cylinder. The ring is configured to resist positioning. When the injection operation is performed, the inner rod moves forward to approach the end of the stroke and touches the lever shrapnel, so that the resisting positioning of the lever shrapnel is released.

The third object of the present invention is to provide an injection needle retracting device for a safety injection syringe, in which the inner rod moves to the end of the stroke due to forward injection, and can produce a snap action with the connecting seat, so that when the inner rod Pulling backward, the connecting seat and the injection needle can be pulled into the cavity of the outer cylinder together, so as to achieve the safety purpose of safely storing the injection needle after use.

According to an injection needle retracting device for a safety injection syringe disclosed in the present invention, the injection syringe includes an outer cylinder and a reciprocating inner rod assembled in the outer cylinder, and the retracting device includes:

A set of connection seat matched in the outer cylinder, the connection seat corresponds to the advancing direction of the inner rod and is close to the travel end position of the inner rod, one end of the connection seat forms a protruding small tube for engaging the injection needle, and The interior of the protruding small tube is axially provided with a flow channel, which is characterized in that:

The other end of the connecting seat forms a fitting part, and the fitting part includes several lever elastic pieces, and one end of each lever elastic piece of the fitting part is in abutment state with the inner cavity of the outer cylinder;

When the inner rod is pushed forward, near the end of the stroke, the front end of the inner rod enters the fitting part of the connecting seat, forcing each lever shrapnel to be pried, so that the other end of each lever shrapnel is against the inner cavity of the outer cylinder The configuration is released, and the inner rod and the connecting part are further combined and locked, so that when the inner rod retreats, it can synchronously drive the connecting seat and the injection needle to retract into the inner cavity of the outer cylinder.

The injection needle retracting device of the safety injection syringe is characterized in that: the inner cavity of the outer cylinder is a cavity with a multi-step diameter, and a stop ring is provided to accommodate and resist the positioning of the connection seat.

The injection needle retracting device of the safety injection syringe is characterized in that: the fitting part provided at the other end of the connecting seat is a cavity structure; the fitting part is provided with a fixing piece connected to the main body of the fitting part And several lever shrapnels that are indirectly connected, each lever shrapnel is interspersed between the fixed pieces, distributed in a circular arrangement on the circumferential surface of the fitting part, and a connecting piece is provided between each lever shrapnel and the adjacent fixed pieces , so that each lever shrapnel can be positioned, and at the same time, it has a movement tendency to be pried.

The injection needle retracting device of the safety injection syringe is characterized in that: the fitting part includes several fixed pieces and several lever elastic pieces, and each lever elastic piece is indirectly provided with an adjacent fixed piece. link sheet.

The injection needle retracting device of the safety injection syringe is characterized in that: each of the lever elastic pieces forms a flange at one end of the inner wall, and when the front end of the inner rod touches the flange, each lever elastic piece is urged to Do the swing function of the lever.

The injection needle retracting device of the safety injection syringe is characterized in that: the front end of the inner rod is provided with a non-return cylinder, and when the inner rod moves forward into the fitting part of the connecting seat, it can be formed with one end of the lever shrapnel. Locking, and at the same time, move the other end of the lever shrapnel, thereby releasing the locking and positioning state of the connecting seat and the outer cylinder.

The injection needle retracting device of the safety injection syringe is characterized in that: the front end of the inner rod is provided with a toggle ring, which will enter the fitting part of the connecting seat during the forward movement of the inner rod, It is in contact with the flanges provided on the inner wall of the front end of several lever elastic pieces provided on the fitting part, and when the inner rod continues to travel to the end point, the toggle ring will pass over the flanges of the lever elastic pieces, and the card will Buckled on the front end of the flange of the lever shrapnel, the connecting seat and the inner rod are combined accordingly, so that when the inner rod moves back, the connecting seat is retracted into the outer cylinder cavity.

In the injection needle retracting device of the safety injection syringe of the present invention, when the inner rod is pushed forward into the fitting part of the connecting seat, the lever shrapnel is moved to generate leverage, so that the lever shrapnel is offset against the outer cylinder of the cylinder body When the configuration of the inner rod is released and the inner rod continues to push forward, the lever shrapnel will cross the toggle ring at the front end of the inner rod and be locked at the non-return cylinder, and then have a buckling effect with the connecting seat, so that the When the inner rod retreats, it can synchronously drive the connecting seat and the injection needle back into the outer cylinder cavity, so as to achieve the purpose of safe storage, and has the advantages of simple structure and convenient operation.

The above is an overview of the structure of the present invention, and a preferred embodiment is given below and described in detail with reference to the drawings.

【Description of drawings】

Figure 1 is an exploded view of the structure of the present invention.

Fig. 2 is a schematic structural view of the outer cylinder of the present invention.

Fig. 3 is a schematic diagram of the structure of the connecting seat of the present invention.

Fig. 4 is a schematic diagram of the combined structure of the present invention.

Fig. 5 is a schematic diagram of the use state of the present invention.

Fig. 6 is a schematic diagram of another usage state of the present invention.

Fig. 7 is a schematic diagram of another usage state of the present invention.

Fig. 8 is a schematic diagram of the structure of the connecting seat according to another embodiment of the present invention.

FIG. 9 is a schematic view of another embodiment of FIG. 8 in use.

【Detailed ways】

Please refer to FIG. 1 , which discloses that the safety syringe of the present invention includes an outer cylinder 10 , a connecting base 20 and an inner rod 30 .

Please refer to FIG. 2 , which discloses that the outer cylinder 10 is a hollow pipe string with two ends penetrating through it, and its inner cavity is close to the front end 12 to form a cavity with multi-step diameters, and accordingly a stop ring 14 is formed. . And the rear end 16 of the inner chamber is provided with a cylinder wing 18 with a larger outer diameter.

Please refer to FIG. 3 , which discloses that the connecting seat 20 includes two parts, one is a protruding small tube 22 , and the other is a fitting part 24 with a cavity structure. The protruding small tube 22 is formed by a tube column for connecting with a needle, and the protruding small tube 22 is axially provided with a flow passage 26 therethrough. The fitting portion 24 includes several lever elastic pieces 28 . The lever elastic pieces 28 are arranged on the circumferential surface of the fitting portion 24, and a connecting piece 281 is arranged between each lever elastic piece 28 and the adjacent fixed sheet body 27, so that each lever elastic piece 28 can be positioned, and it can be The movement tendency of prying. In addition, an outwardly extending engagement flange 282 is formed at the end of each lever spring 28 , and a flange 284 is formed on the inner wall close to the surface of the protruding small tube 22 .

Please refer to FIG. 1 again, the inner rod 30 is a long cylinder, and the end of the inner rod 30 is provided with a flange-shaped toggle ring 34 and a non-return cylinder 35 .

Please refer to FIG. 4 , which discloses the combination of various components. The connection seat 20 is assembled inside the outer cylinder 10 , and each lever elastic piece 28 of the fitting portion 24 leans against the stopper ring 14 on the wall of the outer cylinder 10 with a locking flange 282 at one end. An injection needle 50 is assembled on the protruding small tube 22 of the connecting base 20 .

The inner rod 30 is assembled inside the outer cylinder 10 , and the inner rod 30 can reciprocate inside the outer cylinder 10 . The piston 32 is closely attached to the inner wall of the outer cylinder 10. When the connecting seat 20 is stopped by the stop ring 14, the connecting seat 20 presses the piston 32 forward. In addition to making the connecting seat 20 form axial positioning, Furthermore, the effect of preventing the seepage of the liquid inside the outer cylinder 10 can be enhanced.

Please refer to FIG. 5 , after the injection syringe is used, the user can push the inner rod 30 forward, and at this time, one end of the inner rod 30 enters the fitting portion 24 of the connecting seat 20 . When the end of the inner rod 30 moves to the position of the flange 284 on the inner wall surface of each lever elastic piece 28, and levers each lever elastic piece 28, the snapping flange 282 at one end of the lever elastic piece 28 starts to contact with the stop ring. 14 Separation.

Please refer to FIG. 6 for further explanation: when the inner rod 30 is continuously pushed to reach the end of the stroke, the toggle ring 34 provided at the front end of the inner rod 30 can pry the flange 284 of the lever shrapnel 28, thereby making the The flange 284 of the lever shrapnel 28 crosses the toggle ring 34 of the inner rod 30, and stays at the non-return cylinder 35, so that the abutment flange 282 of the lever shrapnel 28 and the stop ring 14 of the inner cavity of the outer cylinder At the same time, the flange 284 of the lever shrapnel 28 and the toggle ring 34 of the inner rod 30 form a retreating buckle, so when the inner rod 30 is pulled backward, the connecting seat 20 can be It forms a retractable state in conjunction with the inner rod 30 .

Please refer to FIG. 7 , which shows that after the inner rod 30 is combined with the connecting seat 20, the inner rod 30 can be pulled backward to drive the connecting seat 20 and the injection needle 50 on the connecting seat 20 into the outer cylinder together. 10 inside. According to this, the effect of safely accommodating the injection needle 50 is achieved.

Referring to FIG. 8 , the connection portion 20 disclosed can be applied to another injection syringe.

A protruding small tube 22 is formed at one end of the connecting base 20 , and a through channel 26 is axially disposed inside the protruding small tube 22 for connecting with a cannula. The other end of this connection base 20 forms the fitting part 24 of a cavity structure again, and is provided with several lever spring pieces 28 on the circumferential surface of this fitting part 24, between each lever spring piece 28 and the adjacent fixed sheet body 27 A connecting piece 281 is provided. In addition, a locking flange 282 is formed at the end of each lever elastic piece 28 , and a flange 284 is formed at the other end.

Please refer to FIG. 9 , the connecting seat 20 is installed in an outer cylinder 10, and the locking flange 282 of the lever spring 28 can be used to abut against the stop ring 14, and the inner rod 30 is pushed toward At the end of the traveling direction, the toggle ring 34 at the front end of the inner rod 30 can pry the flange 284 of the lever elastic piece 28, so that the flange 284 of the lever elastic piece 28 crosses the toggle ring 34 of the inner rod 30, And stay at the non-return cylinder 35, so that the blocking position of the flange 282 of the lever shrapnel 28 and the stop ring 14 of the inner cavity of the outer tube is released, and at the same time, the flange 284 of the lever shrapnel 28 is in contact with the inner rod. The toggle ring 34 of 30 forms the effect of retreating and locking, so when the inner rod 30 is pulled backward, the connecting seat 20 and the injection needle 50 can be pulled into the inner cavity of the outer cylinder 10 together.

In the description of the above-mentioned embodiments of the present invention, the connecting seat 20 utilizes the lever elastic pieces 28 to form a resisting positioning state with the outer cylinder 10 . Utilize the toggle ring 34 at the front end of the inner rod 30 to pry the flange 284 of the lever elastic piece 28, so that when the flange 284 of the lever elastic piece 28 stays on the non-return cylinder 35, the connection between the connecting seat 20 and the outer cylinder 10 is released synchronously. Resist positioning status. When the flange 284 of the lever shrapnel 28 is used to stay on the non-return cylinder 35, it forms a retreating locking state with the toggle ring 34 of the inner rod 30, so that when the inner rod 30 is pulled backward, the connecting seat 20 and the connecting seat 20 are synchronized with each other. The injection needle 50 is pulled into the outer cylinder 10 together. Therefore, in the structure disclosed in the present invention, there is no need to rely on the spring restoring force to make the connecting seat and the needle fall into the outer cylinder, and it is not necessary to use rotation to release the combined configuration of the connecting seat and the outer cylinder. In addition, the connecting seat 20 and the outer cylinder 10 of the present invention have a positioning function, which can make the connecting seat 20 have better stability during use. Therefore, compared with the aforementioned patents, the present invention not only has a different structure, but also has the advantages of easy operation.

The above preferred embodiments of the present invention and the accompanying drawings are only for illustration and are not intended to limit the protection scope of the present invention.

Claims (7)

1. An injection needle retracting device for a safety injection syringe, the injection syringe includes an outer cylinder and a reciprocating inner rod assembled in the outer cylinder, the retracting device includes: A set of connection seat matched in the outer cylinder, the connection seat corresponds to the advancing direction of the inner rod and is close to the travel end position of the inner rod, one end of the connection seat forms a protruding small tube for engaging the injection needle, and The interior of the protruding small tube is axially provided with a flow channel, which is characterized in that: The other end of the connecting seat forms a fitting part, and the fitting part includes several lever elastic pieces, and one end of each lever elastic piece of the fitting part is in abutment state with the inner cavity of the outer cylinder; When the inner rod is pushed forward, near the end of the stroke, the front end of the inner rod enters the fitting part of the connecting seat, forcing each lever shrapnel to be pried, so that the other end of each lever shrapnel is against the inner cavity of the outer cylinder The configuration is released, and the inner rod and the connecting part are further combined and locked, so that when the inner rod retreats, it can synchronously drive the connecting seat and the injection needle to retract into the inner cavity of the outer cylinder. 2. The injection needle retracting device of the safety injection syringe according to claim 1, characterized in that: the inner cavity of the outer cylinder is a cavity with multi-step diameters, and a stop ring is provided to accommodate And against the positioning of the connecting seat. 3. The injection needle retracting device for a safety injection syringe according to claim 1, characterized in that: the fitting part provided at the other end of the connecting seat is a cavity structure; the fitting part is provided with a fitting part The fixed pieces connected to the main body and several lever shrapnels indirectly connected, each lever shrapnel is interspersed between the fixed pieces, and distributed on the circumferential surface of the fitting part in a circular arrangement, and each lever shrapnel is connected to the adjacent fixed piece. There is a connecting piece between them, so that each lever shrapnel can be positioned, and at the same time, it has a movement tendency to be pried. 4. The injection needle retracting device for a safety injection syringe according to claim 1, characterized in that: the fitting part includes several fixed pieces and several lever elastic pieces, and each of the lever elastic pieces is connected to the adjacent The fixed sheet body is indirectly provided with a connecting sheet. 5. The injection needle retracting device for a safety injection syringe as claimed in claim 1, wherein each lever shrapnel forms a flange at one end of the inner wall, for when the front end of the inner rod touches the flange, , impel each lever shrapnel to perform the swing function of the lever. 6. The injection needle retracting device of a safety injection syringe according to claim 1, wherein the front end of the inner rod is provided with a non-return cylinder, when the inner rod moves forward into the fitting part of the connecting seat, It can be locked with one end of the lever shrapnel, and at the same time, the other end of the lever shrapnel is moved, thereby releasing the locked and positioned state of the connecting seat and the outer cylinder. 7. The injection needle retracting device for safety injection syringe according to claim 1, 3 or 5, characterized in that: the front end of the inner rod is provided with a toggle ring, during the forward movement of the inner rod, will enter the fitting part of the connecting seat, and contact with the flanges provided on the inner wall of the front end of several lever elastic pieces provided on the fitting part, and when the inner rod continues to travel to the end point, the toggle ring will Go over the flange of the lever elastic piece, and buckle on the front end of the flange of the lever elastic piece, thereby combining the connecting seat and the inner rod, so that when the inner rod retreats, the connecting seat is retracted into the outer cylinder cavity.

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