WO2019134381A1

WO2019134381A1 - Retractable safety syringe having replaceable needle

Info

Publication number: WO2019134381A1
Application number: PCT/CN2018/104158
Authority: WO
Inventors: 杨德怡
Original assignee: 汕头华尔怡医疗器械有限公司
Priority date: 2018-01-08
Filing date: 2018-09-05
Publication date: 2019-07-11

Abstract

A retractable safety syringe having a replaceable needle, comprising an outer casing (1), a pushing cylinder (2), a tapered seat (3), an irregularly-shaped liquid-proof ring (4), a slider (5), a spring (6), a rear plug (7) and a piston ring (8); scientific physical data is used in the design to improve the locking, interference and disengagement structures of each part of the retractable safety syringe having a replaceable needle so that the needle may be replaced, and the needle may retract into the pushing cylinder (2), the needle not being exposed after use; a fully automatic device is produced after improvement, and product quality is guaranteed while production costs are reduced, the structure thereof being novel.

Description

Replaceable needle type retracting safety syringe

Technical field

The present invention relates to a safety syringe that can be retracted according to the need to replace various size needles as needed.

Background technique

Syringe is one of the most basic medical devices. In order to reduce the spread of blood-borne diseases in patients, countries around the world, including China, have enacted legislation to force the use of disposable safety syringes. However, the common disposable syringes are generally reusable and have no safety devices, and the needles are exposed after injection. On the one hand, they are easily used by criminals or drug addicts, and on the other hand, syringes that can only be used once. Repeated use can easily cause virus transmission and cross infection. In order to prevent the use of disposable syringes, the needles stabbed the medical staff during the collection and treatment process, resulting in the infection of hepatitis B, hepatitis C and AIDS, causing infections of medical staff. Nurses and waste collectors in various countries were stabbed by syringe needles, about 1000 worldwide. More than 10,000 people, countries around the world are researching and promoting the use of self-destructing safety syringes. The currently known self-destructing safety syringes are mainly piston piercing or manual pull type with a needle, and there is also an automatic spring at the needle seat. When the liquid is injected, the push rod is pushed to the foremost end of the syringe, and at the same time, the needle is The seat is retracted into the barrel along with the needle to prevent the protruding needle from injuring the person. However, these self-destructive safety syringes still suffer from various design deficiencies.

U.S. Patent Application Serial No. 6,572, 584, B1 discloses an automatic retraction device syringe that allows the needle tube and the needle to be automatically retracted into the push barrel. The main purpose of the structure is to prevent the needle from being exposed and to achieve a safety effect, but the inventor has not I can think of two serious flaws in the design of the structure:

1 The inventor did not expect that the structure can be pulled out with a fingernail after using the position in Fig. 3 (60), while retracting the needle seat in the cylinder together with the needle and the spring from the push tube Fig 17 ( 41), (18) (41), (19) (41) position fell, although the needle retracted in the push tube, but the safety purpose of the needle after use is not exposed, if the figure of Figure 3 is reversed (60) The position and the (58) and (60) positions of Fig. 4B are excessively locked, so the product cannot be used. It is necessary to use the injection solution when the (58) position and the (60) position of Fig. 4B are used. After using the structure, the inventor failed to think that the structure can be pulled out after the nurse uses the push tube, and the safety technology has serious defects.

2 The inventor failed to think that the structure could not be assembled automatically on the automated machine, and the fixture must be made. Otherwise, the (24) spring assembly of Fig. 3 could not be completed. Therefore, the use of special fixtures to solve the assembly process caused the product to fail to form a product. The process flow, low efficiency, high wages, and pollution to the product, so the inventors failed to think of serious technical defects.

The defect of invention patent number ZL94193486.1 is the same as above.

The defect of invention patent number ZL99805273.6 is the same as above.

The Chinese Patent No. CN200980874Y discloses a self-destructing safety syringe which can automatically retract the needle holder together with the needle to the push barrel by providing an automatic retracting device in the push barrel. However, the invention fails to completely solve the problem of how to compress the compression spring in the lower part of the push cylinder before use (the inner wall of the push cylinder is smooth and there is no object to buckle, and the compression spring cannot be fastened and compressed), and the remaining after the interference is not solved. How liquids pass through.

To this end, U.S. Patent Application Publication No. US20040215150AI discloses a syringe with an automatic retraction device which is intended to complement this gap:

1) Adoption: a biasing member of a spring (7) surrounding the crotch portion of the connecting rod (67). The spring (7) has an upper end (71) that engages the end wall of the top (543) of the push rod, and the spring has a lower end opposite the upper end, the lower end (72) is embedded by the biasing member and locked in the brake In the groove (81);

2) Adoption: The starting portion has a propelling end (83) that moves with the puncture (62) end of the connecting rod and pulls the end (89). When the coupling shaft (61) end of the connecting rod is pressed, it is disengaged from the outer ring abutment region (66), and once the spring (7) pushes the end (83) with the puncture (62) end moving downward, the trailing end (89) The lower end (72) of the spring (7) can be pulled out of the brake groove (82);

3) Washer: The gasket is placed to bring the convex ring (417) to the rear cavity (234) of the outer casing and the rear cavity front (221). The formation of the washer (3) provides a resistance that supports the positioning of the collar (417) to prevent movement at a certain position of the posterior chamber rim (221) during a subcutaneous or intravenous puncture. This allows the collar (417) to be disengaged from a portion of the rear chamber (221) of the syringe such that when the first external force is applied, the tubular needle position (41) can be moved along the inner wall (230) of the outer sleeve;

4) Use: When the minimum position of the snap-in mechanism (61) is excessive with the maximum position of the needle seat (412), then the remaining liquid is sealed and cannot be circulated. At this time, the push rod (5) When moving forward, there are three problems:

1 According to the normal operation of the nurse, after the needle is subcutaneously puncture, if the finger pressure and speed are used normally, the design method will seal the residual liquid when the (61) and (412) are overfilled;

2 Unless the nurse increases finger pressure and rapid advancement, the needle is injected subcutaneously into the human body, so that the rapid injection operation is unqualified;

3 If it is in normal operation, then (61) and (412) when the surplus is sealed and stopped, press the pressure again to push forward. At this time, the needle piercing the subcutaneous muscle will move, the victim is the most. pain.

U.S. Patent Application Publication No. 5,211, 628 A discloses a syringe with an automatic retraction device that employs a spring biasing member that surrounds the crotch portion of the connecting rod and that has a spring that engages the top end wall of the push rod The upper end also has a lower end that is inserted through the biasing member and locked in the brake groove; in addition, the actuating portion has a pusher end that moves with the piercing end of the connecting rod. At the end of the traction, when the coupling end of the connecting rod is pressed away from the abutment region of the outer ring, the pushing end of the spring will move downward with the piercing end, and the pulling end can pull the lower end of the spring out of the braking groove; By placing a gasket to bring the convex ring to the back cavity of the outer casing and the front cavity of the rear cavity, a resistance is provided for the formation of the gasket, which supports the positioning of the convex ring to prevent the back of the gasket during subcutaneous or intravenous puncture The position of the front wall of the chamber is moved, thus allowing the male ring to be detached from a certain portion of the rear chamber of the syringe, so that when the first external force is applied, the tubular needle can be moved along the inner wall of the outer sleeve. However, the syringe also has some drawbacks: when the minimum position of the carding mechanism is excessive with the maximum position of the needle seat, the remaining liquid is sealed and cannot be circulated, and if the pressure is increased, the push rod is redirected. Before the advancement, the needle piercing the subcutaneous muscle will vibrate, causing pain to the patient receiving the injection.

Chinese Patent No. CN2817873Y also discloses a self-destructing safety syringe which uses a steel needle rebounding device and is placed in an outer needle seat, assembled into a needle assembly, and then screwed to the syringe. The top part not only has the characteristics of ordinary steel needle rebounding disposable syringe, but also has the advantages of simple production process and convenient assembly, but it still cannot solve the resistance problem of the end plug, and the ball design at the front end of the end plug also increases the liquid residue. the amount.

U.S. Patent No. 6,379,336, B1, although the structure of the self-destructing safety syringe is improved, the structure is complicated and not easy to assemble, and the cost is high, the liquid residue is high, and it is difficult to accept when the injection liquid is expensive.

Although a large number of self-destructing safety syringes have been developed at present, there are still various structural defects in these syringes, and in particular, when the connection structure is excessive, the problem of the remaining liquid being sealed has not been solved. The invention is based on the prior art and further revolutionizes the structure of the self-destructing safety syringe to solve the above problems.

The content of the present invention

The object of the present invention is to overcome the above patent deficiencies and it is not easy to think of or to be able to fully overcome these prior art. The present invention has a drawback in that a self-destructing safety syringe according to Patent No. ZL200810096785.1 has a defect in fixing the needle, and The interchangeable needle retractable safety syringe (hereinafter referred to as the publication number) with the publication number CN104027874A and the application number 201410277213.9 aims to improve the fixed needle into a replaceable needle. This technical solution has structural defects, and the ISO standard needle assembly is used. Unable to achieve, the difference lies in the structure of each part. After more than three years of experimentation, the prototype has proved that the publication number has serious defects. The technical solution fails to achieve needle exchange, and the technical route and implementation scheme implemented by the technical solution are completely After the reset implementation, it has been realized from the conversion production to the realization of the marketization, and can be arranged on the needle needle type safety syringe by the user's arbitrarily selected needle number according to the ISO standard needle of the existing market (see the attached picture for details). This is very convenient for the user, and also saves the user a monetary expense. It is equipped with a standard needle for ISO assembly on a replaceable needle-type safety syringe. After use, the taper seat (3) and the slider (5) are rebounded together with the standard needle to the pusher (2) and locked to the rear plug (7). The bump (27), to achieve the needle is not exposed to ensure the safety of the nurse, to prevent the exposure of the needle after exposure to harm the society, leading to the spread of hepatitis B, hepatitis C, AIDS, to achieve needle exchange, standard needle can also retract to the push tube ( 2) Inside, after the needle is used, the needle is not exposed, and the needle is retracted, and the liquid flows into the human body through the mushroom type (21) of the slider (5) and the different strip type (22) of the taper seat (3).

The invention is achieved by the following technical solutions:

1. A replaceable needle retractable safety syringe comprising a jacket (1), a pusher cylinder (2), a taper seat (3), a profiled liquid retaining ring (4), a slider (5), a spring (6) , the rear plug (7), the piston ring (8), the technical solution is: the outer end of the outer casing (1) is provided with a resistance ring (9), and the inner diameter of the resistance ring (9) is provided with a resistance ring cavity (28), including a guide The resistance ring (9) sets the back end plane (29) and the step limit (31) of the taper seat (3) to each other, including the outer sleeve (1) with a profiled collar (14) (the jacket in the publication number (1) The technical solution is not disclosed. The taper seat (3) is provided with a first step (11), a second step (10), and a natural step between the first step (11) and the second step (10). Limit (31), fully utilizing the naturally formed step limit (31) when mounted on the outer casing (1) and the rear end plane (29) of the resistance ring (9) is limited to prevent over-heading, including taper seats (3) The top strip is also provided with a different strip type (22), which is mainly embodied in different lengths and thicknesses, and is set to have less resistance when the mushroom type (21) of the slider (5) has an interference. The function of pulling the fastening force is large, (the taper head in the publication number (2) fails to disclose the technical solution) Including the convex type (12) of the shaped anti-liquid ring (4), considering that the convex type (12) provides the top end (20) of the pusher (2) to cooperate with the propulsion, and reduces the expansion resistance, and on the other hand, considers the automatic production. When it is not necessary to identify the direction, this solution provides automatic equipment to improve production efficiency (the second liquid-proof ring (7) in the publication number fails to disclose the technical solution), and the special-shaped liquid-proof ring (4) is installed in the taper seat. The first step (11) of (3), the convex shape (12) of the special-shaped liquid-repellent ring (4) is tightly fitted with the first step (11) of the taper seat (3), and the taper seat (3) includes the special-shaped liquid-proof prevention The ring (4) is installed at the center hole (26) of the outer casing (1). The step limit (31) of the taper seat (3) is limited by the rear plane (29) of the outer casing (1) during installation to prevent installation. Over the head, the second step (10) of the taper seat (3) and the guide ring (9) of the outer casing (1) slide and cooperate with each other, and the outer diameter (13) of the special-shaped liquid-proof ring (4) and the outer diameter of the front end of the outer casing (1) The planarly disposed profiled collar (14) has an over-tight fit (the outer casing (1) and the second liquid-proof ring (7) in the publication number fail to disclose the technical solution), and provides a standard needle without tilting to make the taper seat (3) erecting the center and erecting the center The upper end of the seat (3) is provided with a taper mounting universal standard needle tight fit, so the force is applied when the universal standard needle is assembled in use, and the force is not reversed. The front end of the push tube (2) is provided with a platform plane (15), and a slider is provided (5) ), including a spring (6) mounted on the pusher (2) platform plane (15), so the slider (5) is provided with a second step between the second step (17) and the third step (18). (30) The cap plane (15) of the pusher cylinder (2) is installed over the head, including the spring (6) and the cap plane (15) of the pusher cylinder (2) is limited, and the top of the slider (5) is also provided with a mushroom type. (21), further comprising a liquid passing groove (25), including a slider (5), wherein the first step (16), the second step (17), and the third step (18) are provided, and the technical solution adopts a slider (5) The third step (18) is mounted on the pusher (2) platform plane (15) position and the taper (19) is mutually over-tightened and fully utilizes the second step (17) and the third step of the slider (5). (18) The second step (30) is naturally formed as a limit (the pusher (11) and the slider (13) of the publication number fail to disclose the technical solution), and the control spring (6) releases the elastic force, forcing the spring (6) ) Formation of static pressure (the technical solution in the publication number uses a slider (13) The T-shaped (14) buckled on the push ring (12) of the push cylinder (11) or the point buckle (18) causes the spring (16) to form a static pressure, and when the push cylinder (11) is pressed, the slider (13) The T-shape (14) passes over the buckle (12) or the point buckle (18) of the pusher (11), and the spring (16) acts at this time, and the buckle (12) or the point buckle (18) There is a technical risk in the mold, and there is a technical risk. Forced demoulding physically makes the buckle (12) or the point buckle (18) easily deformed. This technical solution is different from the first one using the slider (5). The three steps (18) and the taper (19) of the pusher (2) are mutually over-tightened, including the use of the second step (30) limit, and the lower end of the third step (18) including the slider (5) is set to start. The trigger (33) receives the force from the trigger (33) of the taper seat (3). Once the force is slightly applied, the spring (6) acts, and the third step (18) of the slider (5) is easily and easily pushed away. The taper (19) of the cylinder (2) is not subject to technical risk according to the technical solution, the spring (6) is mounted on the second step (17) of the slider (5) for guiding, and the spring (6) is disposed on the slider ( 5) The first step (16) is limited and cannot function. When the mushroom type (21) of the slider (5) is advanced, the interference taper seat (3) The different strip type (22) is clamped. When the mushroom type (21) and the different strip type (22) are clamped, the liquid continues to flow from the liquid passing groove (25), and the front end of the push barrel (2) is also set. The groove (24) is mounted with a piston ring (8) fitted to the inner diameter of the outer casing (1), and is slidably fitted to form a complete product, characterized in that when the push cylinder (2) is advanced, the top end (20) of the push cylinder (2) is advanced. When the profiled liquid-proof ring (4) is in the position of the convex type (12), the deformed liquid-proof ring (4) is separated from the profiled convex ring (14) of the outer casing (1), and the convex shape of the shaped liquid-proof ring (4) is simultaneously (12) Disengaged from the first step (11) of the taper seat (3), the guide ring cavity (28) of the inner diameter of the outer ring (9) of the guide ring (9) is advanced, and the third step of the slider (5) (18) Off the pusher (2) taper (19), while the slider (5) front end is provided with a mushroom type (21) interference taper seat (3) different strip type (22) clamped, and is set in the taper seat (3) The trigger (33) is in contact with the lower end starter (32) of the third step (18) of the slider (5), while the spring (6) releases its nature, the slider (5), the taper seat ( 3), together with the needle tube, play the bumps (27) that are locked to the rear plug (7) of the pusher (2) at the same time.

2. The front end of the outer casing (1) is provided with a resistance ring (9) and a second step (10) of the taper seat (3) slidingly fitted with each other. The structure is provided with a guiding taper seat (3) as a center and a taper seat (3). The first step (11) is mounted with the special-shaped liquid-proof ring (4) and the outer diameter of the front end of the outer casing (1), and the outer-shaped convex ring (14) is provided with an interference fit, and the rear end plane (29) of the outer casing (1) limits the taper seat ( 3) Installed over the head, when the special-shaped liquid-proof ring (4) advances, it is separated from the first step (11) of the taper seat (3), and the inner diameter of the guide ring (9) is blocked (9). Advancing, at the same time, the special-shaped liquid-proof ring (4) is separated from the profiled convex ring (14) of the outer casing (1), and the technical structure of the front end of the outer casing (1) is realized. The conductive ring (9) and the resistance ring cavity in the structure of the present invention (28), the profiled collar (14), including the rear plane (29) limit is different from (the jacket (1) in the publication number).

3. Pusher tube (2) Set the platform plane (15) to provide the limit of the platform plane (15) provided by the slider (5) and the spring (6), and provide the third step of the slider (5) (18) With the taper (19) of the pusher (2), the tension (19) is overtightened, forcing the spring (6) to be pressed to form a static, and the pusher (2) is also provided with a groove (24) to mount the piston ring (8) and the outer casing (1) The sliding fit realizes the simple and rational structure of the push cylinder (2), avoids the complexity of the structure, and affects the realization of the structural technical scheme. The taper (19) and the slider (5) of the pusher (2) in the technical scheme of the present technology The three-step (18) interference grip is different from the buckle (12) or the point buckle (18) buckle slider (13) of the pusher (11) in the publication number.

4. The taper seat (3) is provided with a first step (11), a second step (10) and a top strip type (22), and the first step (11) is provided with a special-shaped liquid-proof ring (4), shaped anti-liquid The convex shape (12) provided by the circle (4) and the first step (11) of the tapered seat (3) are mutually interferenced, and the outer diameter (13) of the special-shaped liquid-proof ring (4) and the inner diameter plane of the front end of the outer casing (1) The profiled collars (14) are mutually interferenced, prevent leakage and are placed against the taper seat (3) when the universal standard needle is assembled, and the first step (11) and the second step (10) of the taper seat (3) The step limit (31) between the ends is limited by the rear end plane (29) of the jacket (1) of the guide ring (9), which is disposed between the first step (11) and the second step (10) The step limit (31) prevents the taper seat (3) from being mounted on the outer casing (1) and is arranged over the head. The top of the taper seat (3) is provided with a different strip type (22) to provide a mushroom type of the slider (5) (21) ) The interference is tightened, reaching the taper seat (3) and the needle with the fastening band, the second step (10) is set with the outer casing (1) of the guide ring (9), the positive taper seat (3), the taper seat ( 3) The different strip type (22) and the slider (5) front end set mushroom type (21) are both intertwined and mutually clamped to achieve the technical side. In the technical solution, the first step (11), the second step (10), and the different strip type (22) of the taper seat (3) in the technical solution are different from the taper head in the publication (2) ).

5. The top of the slider (5) is provided with a mushroom type (21), a liquid passage groove (25), a first step (16) including a slider (5), a second step (17), and a third step (18). ), the first step (16) is set to limit the spring (6), the second step (17) provides the spring (6) to guide the installation, and the third step (18) and the taper (19) of the pusher (2) pass each other. The grip is tight, forcing the spring (6) to be pressed to form a static pressure state, the second step (30) between the second step (17) and the third step (18) and the cap plane of the pusher (2) ( 15) Restricting each other to prevent the slider (5) from being over-wrapped, the mushroom type (21) of the slider (5) advancing the cross-sectional type (22) of the interference taper seat (3) is clamped, and the liquid passes through the mushroom The through liquid groove (25) of the type (21) flows into the human body, and the slider (5) is used in the technical solution to set the third step (18) and the taper (19) of the push tube (2) to be over-tight, including a slider. The lower end of the third step (18) of (5) is provided with a starter (32), which is different from the point type buckle (18) or buckle (12) in the publication number using the slider (13) and the pusher (11). ) fasten).

6. Shaped liquid-proof ring (4) Designed with inner diameter convex type (12), considering the convex side to provide the pushing tube (2) the top end (20) position to cooperate with the propulsion, reduce the expansion resistance and set, on the other hand, consider the special-shaped liquid-proof ring (4) ) When the orientation of the automated equipment is assembled, the convex shape (12) of the shaped liquid-proof ring (4) is set to be the same as the left and right, and the convex shape (12) of the shaped liquid-proof ring (4) in the present technical structure is different from (Second liquid-proof ring (7) in the publication number).

Seventh, the design of the structure interacts with the physical, and the physical interaction is also the same principle concept setting, six of them play a role at the same time, the technical concept of the concept and technical features of the jacket (1), push cylinder (2), taper The seat (3), the slider (5), the profiled liquid-repellent ring (4), and the other parts are characterized in that the components are manufactured under the data setting and physical interaction, and the design of the parts is simplified. The replacement of automatic equipment for installation and automatic installation of spare parts is one of the primary considerations. Therefore, it overcomes the technical defects, reduces the complexity of process manufacturing and other technical solutions, achieves practical (low price) products, and realizes product invention, conversion production and marketization.

The technical solution of the present invention, in particular, highlights the structural concept of the product technical scheme of the interchangeable needle type automatic retracting type, and the technical core of the structural design lies in the outer casing (1), the push cylinder (2), the taper seat (3), the special-shaped liquid proof The ring (4) and the slider (5) are characterized in that when the pusher (2) is advanced forward, the top end (20) of the pusher (2) is pushed into the convex shape of the profiled liquid retaining ring (4) (12) At the same time, the shaped anti-missing ring (4) is separated from the profiled convex ring (14) of the outer casing (1), and the shaped anti-liquid ring (4) is separated from the first step (11) of the tapered seat (3), toward the outer casing (1) The guide ring (9) of the inner diameter of the guide ring (28) is advanced while the third step (18) of the slider (5) is separated from the taper (19) of the pusher (2) while the slider (5) The front end is provided with a mushroom type (21) interference taper seat (3) and a different strip type (22) is clamped, and a trigger (33) of the taper seat (3) and a third step (a) disposed on the slider (5) are provided ( 18) The lower end of the starter (32) is in contact, while the spring (6) releases its nature, and the slider (5), the taper seat (3), and the needle tube are simultaneously brought together and locked in the push tube ( 2) The bump (27) of the back plug (7) realizes 6 simultaneous technical solutions to achieve the needle after the liquid injection Automatic retraction purpose is not exposed. And the liquid continues to flow into the human body through the different strip type (22) of the taper seat (3). This technology is different from the interchangeable needle type retractable safety syringe with the publication number CN104027874A and the application number 201410277213.9.

BRIEF DESCRIPTION OF THE DRAWINGS:

1 is a schematic structural view of an embodiment of the present invention

2 is a schematic view showing a partial enlarged structure of an embodiment of the present invention;

FIG. 3 is a schematic view showing the structure of the slider and the tapered seat belt with the needle retracted and locked to the rear plug according to the embodiment of the present invention;

4 is a schematic view showing an enlarged structure of a jacket according to an embodiment of the present invention

4a is a schematic enlarged plan view of the embodiment of FIG. 4 according to an embodiment of the present invention;

Figure 5 is a schematic view showing the structure of a taper seat according to the present invention;

Figure 6 is a schematic view showing the structure of a special-shaped liquid-proof ring according to the present invention;

Figure 7 is a schematic view showing the structure of the push cylinder of the present invention

FIG. 7a is a schematic enlarged view of a push tube according to an embodiment of the present invention;

Figure 8 is a schematic view showing the structure of a slider according to the present invention

FIG. 8a is a schematic plan view showing the enlarged structure of the slider according to the present invention;

Figure 9 is a schematic view of the structure of the plug after implementation of the present invention

Figure 10 is a schematic view of the spring structure of the present invention

Figure 11 is a schematic view showing the structure of a piston ring according to the present invention

Figure 1: 1, outer casing; 2, push cylinder; 3, taper seat; 4, shaped anti-liquid ring; 5, slider; 6, spring; 7, back plug; 8, piston ring; 27, bump; Second step; 32, starter; 33, trigger;

Figure 2: 1, outer casing; 2, push cylinder; 3, taper seat; 4, shaped anti-liquid ring; 5, slider; 6, spring; 9, resistance ring; 11, first step; ; 14, shaped convex ring; 15, platform plane; 16, first step; 17, second step; 18, third step; 19, taper; 20, pushing the top; 21, mushroom type; Sheet type; 25, liquid channel; 26, center round hole; 28, guide ring cavity; 29, rear plane; 30, second step; 31, step limit; 32, starter; trigger;

Figure 3: 3, taper seat; 5, slider; 6, spring; 7, back plug; 15, platform plane; 18, third step; 19, taper; 20, pushing the top; 21, mushroom type; 22, different strip type; 26, center round hole; 27, bump; 28, guide ring cavity; 29, rear plane; 30, second step; 31, step limit; 32, starter ;33, trigger;

Figure 4: 1, outer casing; 9, guide ring; 14, shaped convex ring; 26, central circular hole; 28, guide ring cavity; 29, rear plane;

Figure 5: 3, taper seat; 10, second step; 11, first step; 22, different strip type; 31, step limit; 33, trigger;

Figure 6: 4, shaped anti-liquid ring; 12, convex; 13, outer diameter;

Figure 7: 2, push cylinder; 15, platform plane; 19, taper; 20, pusher tip; 24, groove;

Figure 8: 5, slider; 16, first step; 17, second step; 18, third step; 21, mushroom type; 25, liquid channel; 30, second step; 32, starter;

Figure 9: 7, the back plug; 27, the bump;

Figure 10: 6, spring;

In Figure 11: 8, the piston ring.

Specific implementation plan:

In the embodiment: referring to Figures 1, 2, and 3, in the practice of the present invention, the replaceable needle retractable safety syringe shown in Figures 1, 2, and 3 includes the outer casing of Figure 1; The push cylinder 2, the tapered seat 3, the profiled liquid retaining ring 4, the slider 5, the spring 6, the rear plug 7, and the piston ring 8.

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 8, and Fig. 10, after the needle-type safety syringe is used, the needle is automatically retracted after the product of Fig. 3 is used, and the product is not in the product. When the liquid medicine is present, the structure push cylinder 2, the taper seat 3, the special-shaped liquid retaining ring 4, the slider 5, and the spring 6 simultaneously act to lock the needle back to the bump 27 of the back plug 7, so that the needle is not exposed. To protect the personal safety of the nurse, to prevent the exposure of the needle sharpener and endanger the personal safety; in the implementation of Figure 4 and Figure 2, the front end of the outer casing 1 is provided with a circular hole 26, and the center circular hole 26 of Figure 2 is installed. Figure 5 Taper seat 3 and installation Figure 6 The liquid-proof ring 4, the convex shape 12 of the special-shaped liquid-proof ring 4 of FIG. 6 is tightly matched with the outer diameter 11 of the taper seat 3 of FIG. 5, and the outer diameter of the shaped liquid-proof ring 4 of FIG. 6 and the front-end shaped convex ring 14 of the outer cover of FIG. Tight fit interference, when used, push the top end 20 of the push barrel 2 of Fig. 3 to advance the convex shape 12 of the shaped anti-liquid ring 4 of Fig. 6 toward the front end of the guide ring chamber 28 of Fig. 3, thereby realizing the escape of the taper seat 3 of Fig. 3 The liquid ring 4 makes the taper seat 3 of Fig. 3 unconstrained by any object, and Fig. 3 functions at the static spring 6 at this time, and the slider 5 is coupled with the taper seat 3 with a standard needle lock. Tight to the rear plug 7, the pusher 2 of the pusher 2 of FIG. 2 is provided with an over-tight fit of the third step 18 of the slider 5 of FIG. 8, and FIG. 2 is mounted with the slider 5 of FIG. 8 and the spring (6) of FIG. When the pusher 2 of FIG. 2 is advanced, the top mushroom 21 of the slider 5 of FIG. 8 is over-engaged to the taper of the taper seat 3 of FIG. 5, and the actuator 32 of the slider 5 of FIG. The triggers of the taper seat 3 are in contact with each other to activate the repulsive force, so that the third step 18 of the slider 5 of FIG. 2 to FIG. 3 is safely disengaged from the taper of the push barrel 2 of FIG. 3, as shown in FIG. 2 At the same time, the mushroom type 21 of the slider 5 of Fig. 8 installed at the front end of the push cylinder 2 of Fig. 2 is connected to the different strip type 22 of the taper seat 3 of Fig. 2 installed in the center circular hole 26 of the outer casing 1 of Fig. 4. As shown in Fig. 2, a reaction force is applied, while the mushroom type 21 of the slider 5 and the different strip type 22 of the taper holder 3 are forced to be fastened as shown in Fig. 3, and at the same time, the third step 18 of the slider 5 is disengaged as shown in Fig. 3. Pushing the taper 19 of the cylinder 2, and simultaneously installing the spring 6 in the plane 15 of the pusher cylinder 2 as shown in Fig. 3, while exerting its elasticity, as shown in Fig. 3, simultaneously pushing the slider 5 together with the taper seat 3 with a standard needle and a needle tube The inside of the cylinder 2 is locked to the bump 27 of the rear plug 7. As shown in Fig. 3, the needle is not exposed, so that the nurse will not be stabbed by the needle weapon, causing infection of AIDS, hepatitis B, hepatitis C and the like, thereby achieving protection of the nurse's personal safety and putting an end to the safety. The use of the syringe after the use of the needle is harmful to the society, and the prior art of overcoming the safety syringe cannot be conceived, and is a prominent point of the present invention.

As shown in FIG. 3, FIG. 4, FIG. 5 and FIG. 6, as shown in FIG. 4, a central circular hole 26 is provided at the front end of the outer casing 1, and a tapered ring 9 is disposed on the side circumference of the tapered circular seat 3 of FIG. 5 and the central circular hole 26 of FIG. The second step 10 of the taper seat 3 of FIG. 5 is provided. The inner diameter of the guide ring 9 of FIG. 4 is further provided with a guide ring cavity 28, and the rear end of the guide ring cavity 28 of FIG. 4 is provided with a profiled convex ring 14 to provide the special shape protection of FIG. The liquid ring 4 is positioned, and the special-shaped liquid-proof ring 4 is propelled in space as shown in FIG. 3 by the guide ring body 28, and the taper seat 3 of FIG. 5 and the profiled liquid-proof ring 4 of FIG. 6 are formed independently, and the structure is simple, and is suitable for automatic production.

As shown in FIG. 2, FIG. 4, FIG. 5 and FIG. 6, the front end of the taper seat 3 of FIG. 5 is provided with a first step 11 and a second step 10, and the top end of the taper seat 3 is also provided with a different strip type 22, and the first step 11 of FIG. The outer shape anti-liquid ring 4 of Fig. 6 is tightly fitted, and is installed in the center hole 26 of the front end of the outer casing 1 of Fig. 2. The second step 10 of the taper seat 3 of Fig. 6 is slidably engaged with the outer ring 9 of the outer casing of Fig. 4 to perform positioning. The step limit 31 between the first step 11 and the second step 10 of the taper seat 3 is limited by the rear end plane 29 of the outer casing 1 of the outer casing 1 to prevent over-heading, and the top of the taper seat 3 of FIG. The type 22 is provided with liquid, and the special-shaped design is mainly embodied in different lengths and thicknesses, and the mushroom type (21) when the slider (5) is provided with less resistance, and the pull-back fastening force is large. In the pressurized process, the liquid flows into the human body through the different strip type 22 of the taper head 3 of Fig. 5, which is one of the points of implementation of the present invention.

As shown in FIG. 1 , FIG. 2 , FIG. 3 , FIG. 4 , FIG. 7 , FIG. 8 , FIG. 10 and FIG. 11 , FIG. 7 push barrel 2 is provided with taper 19 and groove 24 , and groove 24 is installed with piston ring 8 of FIG. 11 . 4, the pusher 2 taper 19 is implemented in an over-tight fit with the third step 18 of the slider 5 of FIG. 8, and the spring 6 is released to release the elastic force, so that the spring 6 of FIG. 10 is used before use. The static pressure state is formed, and the pusher cylinder 2 of FIG. 7 is further provided with a deck plane 15 to provide the slider 5 of FIG. 8, the third step 18, and the spring 6 of FIG.

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 5, Fig. 8, and Fig. 10, the liquid passing groove 25 is provided at the tip end of the slider 5 of Fig. 8, and the liquid groove is formed in the middle of the liquid passing groove 25 by using the liquid at the time of injection, Fig. 8 The rear end of the slider 5 is implemented with the first step 16, the second step 17, the third step 18, and the top end of the mushroom type 21, and the first step 16 of the slider 5 of Fig. 8 limits the spring 6 of Fig. 10, and the second step 17 of Fig. 8 is installed. The spring 6 is guided, and the third step 18 of Fig. 8 and the taper 19 of the pusher 2 of Fig. 2 are controlled by the interference. The spring 6 of the Fig. 10 is elastic, and the mushroom type 21 of the slider 5 and the tapered type of the taper seat 3 of Fig. 5 are shown. 22 interference clamp, when the pusher 2 of Fig. 2 advances forward, forcing the taper 19 of the pusher 2 of Fig. 2 out of the third step 18 of the slider 5 of Fig. 8, the second step 17 of the slider 5 of Fig. 8 is installed Figure 10 spring 6 and as a guide, while the static pressure of the spring 6 as shown in Figure 2 and Figure 3 to play its elasticity, the slider 5 of Figure 8 and Figure 5 taper seat 3 with a standard needle together into the Figure 2 push barrel 2 Inside, the projection 27 of the rear plug 7 of Fig. 3 is locked to realize that the needle is not exposed, and one of the highlights of the present invention.

As shown in FIG. 1 , FIG. 3 , FIG. 7 , FIG. 9 and FIG. 10 , the center mounting protrusion 27 of the rear plug 7 of FIG. 9 is installed at the rear end of the push barrel 2 of FIG. 7 , and the outer diameter of the rear plug 7 is set and pushed by FIG. 7 . The rear end of the cylinder 2 is over-tightened. When the push cylinder 2 of FIG. 1 is advanced, the third step 18 of the slider 5 mounted on the upper end of the push cylinder 2 of FIG. 3 is pressed away from the taper 19 of the push cylinder 2, in the figure. Under the action of spring 6 elastic force, the slider 5 of Fig. 3, together with the taper seat 3, together with the standard needle, springs into the projection 27 of the rear plug 7 of Fig. 3, preventing the artificial forced pull-opening, causing the needle to come off the dew, causing injury to the person. Safety.

Claims

Replaceable needle retractable safety syringe, including outer casing (1), pusher (2), taper seat (3), profiled liquid retaining ring (4), slider (5), spring (6), rear plug ( 7), a piston ring (8), characterized in that: the front end of the outer casing (1) is provided with a resistance ring (9), including a rear end plane (29), and the inner diameter of the resistance ring (9) is provided with a resistance ring cavity The body (28) includes a profiled convex ring (14) disposed at a front end of the outer casing (1), and the tapered seat (3) is provided with a first step (11), a second step (10), including the first step ( 11) a step limit (31) formed between the second step (10), the top end of the taper seat (3) is further provided with a different strip type (22), including a lower end setting trigger (33), The shaped liquid-proof ring (4) is provided with a convex shape (12), and the convex shape (12) of the special-shaped liquid-proof ring (4) is tightly matched with the first step (11) of the tapered seat (3). The outer diameter (13) of the special-shaped liquid-repellent ring (4) is tightly fitted with the irregular-shaped convex ring (14) disposed at the front end inner diameter plane of the outer casing (1), and the second step of the tapered seat (3) (10) a sliding fit with the guide ring (9) of the outer casing (1) such that the tapered seat (3) is centered, and the first step of the tapered seat (3) The second step (10) is limited by the natural formation step limit (31) by the rear end plane (29) of the outer casing (1) of the guide ring (9) to prevent over-heading, the taper seat (3) and The deformed liquid retaining ring (4) is installed at a central circular hole (26) position of the outer casing (1), and a front surface (15) is arranged at a front end of the push cylinder (2), and the push cylinder (2) is further A taper (19) is provided, a mushroom type (21) is disposed at a top end of the slider (5), and a liquid passing groove (25) is further disposed, including a first step (16), a second step (17), and a third step ( 18), the spring (6) is mounted to a second step (17) of the slider (5), and the slider (5) including the spring (6) is mounted to the push barrel (2) At the lower end of the platform plane (15), the second step (17) of the slider (5) and the third step (18) are mutually urged by the second step (30) formed naturally (2) The cap plane (15) is limited, the spring (6) is limited by a first step (16) provided on the slider (5), and the third step (18) of the slider (5) The taper (19) mounted on the pusher cylinder (2) is mutually over-tightened, and the third step (18) of the slider (5) is provided with a step-type starter (32), The spring (6) is pressed and the third step (18) of the slider (5) and the taper (19) of the pusher (2) are mutually over-tightened to form a static pressure state, when the slider ( 5) The mushroom type (21) is over-extracted during the advancement of the tapered seat (3) When the differential strip type (22) is over-engaged, all the liquid continues to circulate through the liquid-passing groove (25), the push-up cylinder (2) The front end setting groove (24) is mounted with the piston ring (8), and the piston ring (8), including the push barrel (2), is mounted on the inner diameter of the outer casing (1) to form a complete product. The utility model is characterized in that when the push cylinder (2) advances forward, the top end (20) of the push cylinder (2) is pushed into the special-shaped liquid-proof ring (4), and the special-shaped liquid-proof ring (4) Disengaging the profiled collar (14) of the outer casing (1) while the profiled liquid-repellent ring (4) is disengaged from the first step (11) of the tapered seat (3) toward the outer casing (1) The back ring (9) of the backstop ring cavity (28) is advanced while the third step (18) of the slider (5) is disengaged from the taper (19) of the pusher (2) while the sliding The front end of the device (5) is provided with a mushroom type (21) interference, the tapered seat (3), the different strip type (22), the interference clamp, and the contact at the taper seat (3) The device (33) is in contact with the actuator (32) disposed at the lower end of the third step (18) of the slider (5) while the spring (6) releases its nature, the slider (5), The taper seat (3), together with the needle tube, simultaneously acts as a bump (27) that is brought up to lock the rear plug (7) of the pusher cylinder (2).
The interchangeable needle retractable safety syringe according to claim 1, characterized in that: the front end of the outer casing (1) is provided with a resistance ring (9), including a rear end plane (29), and the resistance ring (9) The inner diameter is provided with a resistance ring cavity (28), and the outer diameter plane is provided with a profiled convex ring (14), and the outer diameter of the resistance ring (9) is slidably matched with the second step (10) of the taper seat (3) The structure has a center of the tapered seat (3), and the outer diameter of the front end of the outer casing (1) is provided with a profiled convex ring (14) and the outer diameter (13) of the deformed liquid retaining ring (4) is mutually interferenced. Cooperating, the first step (11) of the taper seat (3) and the special-shaped liquid-repellent ring (4) are mutually interferenced, and when the deformed liquid-proof ring (4) is advanced, the taper seat is disengaged (3) a first step (11) and a profiled collar (14) of the outer casing (1).
The interchangeable needle retractable safety syringe according to claim 1, wherein the front end of the push cylinder (2) is provided with a platform plane (15), including a taper (19), and includes a groove (24). The cap plane (15) of the pusher cylinder (2) is arranged to be limited by the second step (30) between the second step (17) of the slider (5) and the third step (18) The pusher (2) taper (19) is provided to provide a third step (18) of the slider (5) to over-tighten each other, so that the spring (6) is pressed to form a static, the push tube ( 2) The groove (24) is provided to fit the piston ring (8) to the sliding fit of the outer casing (1).
The interchangeable needle retractable safety syringe according to claim 1, wherein the taper seat (3) is provided with a first step (11), and includes a second step (10), the taper seat (3) The lower end is provided with a trigger (33), and the top end of the taper seat (3) is provided with a different strip type (22), and the taper seat (3) and the deformed liquid retaining ring (4) are mounted on the outer casing (1) Position of the central circular hole (26), the step limit (31) between the first step and the second step (10) of the tapered seat (3) is received by the outer casing (1) of the guide ring (9) The rear end plane (29) is limited, and the first step (11) is tightly fitted with the convex shape (12) of the special-shaped liquid-repellent ring (4) to prevent liquid leakage and bacteria intrusion, and the second step (10) Providing a sliding fit with the outer casing (1) of the guide ring (9), the central circular hole (26) mounted on the outer casing (1) guiding the center of the taper seat (3), the taper seat (3) The different strip type (22) is matched with the mushroom type (21) at the front end of the slider (5), and when the pusher (2) and the slider (5) are advanced, both The interference is stuck to each other.
The interchangeable needle retractable safety syringe according to claim 1, characterized in that: the top end of the slider (5) is provided with a mushroom type (21), and a liquid-passing groove (25) is further provided, including the slider ( a first step (16) of 5), comprising a second step (17) comprising a third step (18), the first step (16) limiting the spring (6), the second step (17) providing The spring (6) is guided, and the third step (18) and the taper (19) of the push cylinder (2) are mutually over-tightened, so that the spring (6) cannot be exerted under pressure, forming a static pressure state. a second step (30) naturally formed between the second step (17) and the third step (18) and a platform plane (15) of the pusher cylinder (2) are mutually constrained. The lower end of the third step (18) of the slider (5) is provided with a starter (32), and the mushroom type (21) of the slider (5) pushes the different strip type of the tapered seat (3) (22) Clamping, and the liquid flows into the human body through the liquid-passing groove (25) of the mushroom type (21).
The interchangeable needle retractable safety syringe according to claim 1, wherein the deformed liquid retaining ring (4) is shaped differently, and the inner diameter is provided with the convex shape (12), and the push is provided in consideration of the convex side. The top end of the cylinder (2) is advanced in position, and the orientation of the shaped liquid-proof ring (4) during assembly of the automated device is considered, so that the convex shape (12) of the shaped liquid-proof ring (4) is left and The same right.
The replaceable needle retractable safety syringe according to claim 1, wherein the six functions simultaneously, and the technical solution and technical features thereof are that the outer casing (1), the push cylinder (2), The taper seat (3), the slider (5), and the special-shaped liquid-repellent ring (4) are provided with a profiled shape and a simple structure, and fully utilize the various shapes to be provided as a function, and the practical feature lies in the mutual data. Under the setting and physical interaction, the six simultaneous and all structures are adapted to the installation and automatic detection of automated equipment to achieve industrialization.