WO2015192485A1

WO2015192485A1 - Retractable safe syringe with changeable needle

Info

Publication number: WO2015192485A1
Application number: PCT/CN2014/086029
Authority: WO
Inventors: 杨育和
Original assignee: 杨育和
Priority date: 2014-06-19
Filing date: 2014-09-05
Publication date: 2015-12-23
Also published as: CN104027874A

Abstract

A retractable safe syringe with a changeable needle, comprising an outer sleeve (1), a protective sleeve (8), a tapered head (2), a pushing tube (11), a first gasket(25), a slider (13), a spring (16), a rear plug (22) and a second gasket(7). The present invention employs scientific physical data in designing, and is provided with a lock catch, interference and separating structures of each part of the retractable safe syringe with a changeable needle, enables the needle to be changeable and retracted into the pushing tube, thus preventing the needle from being exposed after usage, facilitating a nurse one-handed manipulating, and avoiding pricking the nurse and spreading infectious disease sources or harm to society caused by an exposed needle.

Description

Replaceable needle type retracting safety syringe

Technical field

The present invention relates to a self-destructing safety syringe, and more particularly to a replaceable needle retractable safety syringe.

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 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 stab the medical staff during the collection and treatment process, resulting in the infection of hepatitis B, hepatitis C and AIDS, which has caused the infection of medical staff. All countries in 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 of the technique is severe. Heavy 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 the 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 subcutaneous puncture of the needle, the normal use of finger pressure and speed, the design method will seal the residual liquid when (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.

US Patent No. US Pat. 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 present invention is present On the basis of technology, the structure of the self-destructing safety syringe is further improved to solve the above technical 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 deficiencies and the like based on a self-destructing safety syringe of the patent number ZL200810096785.1 include improvement of defects. The fixed needle including the safety syringe is improved to a replaceable needle type retractable safety syringe, and can be arranged on a replaceable needle type safety syringe according to the ISO standard needle of the existing market, which can be arbitrarily selected by the user. 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 head (2) and the slider (13) together with the standard needle are locked in the push-pull (11) and locked in the rear plug (22). Bump (23), to ensure that the needle is not exposed, to ensure the safety of the nurse, to prevent the exposure of the needle to the society, resulting in the spread of hepatitis B, hepatitis C, AIDS, to achieve needle exchange, with a standard needle (27) can also retract After the needle (11) is reached, the needle is not exposed, and the needle is retracted, and the liquid flows into the human body through the liquid-passing hole (30) of the taper head (2).

The invention is achieved by the following technical solutions:

The utility model relates to a replaceable needle type retracting safety syringe, which comprises a jacket (1), a taper head (2), a pusher cylinder (11), a first liquid retaining ring (25), a slider (13), a spring (16), The rear plug (22) and the second liquid retaining ring (7) are technically based on:

1. After the needle-type safety syringe is used, the needle is automatically retracted to the rear end (24) in the pusher cylinder (11), and locked to the bump (23) of the rear plug (22), so that the needle is not exposed. To protect the personal safety of the nurse, to prevent the exposure of the needle sharp weapon and endanger the personal safety; to set the cavity (6) at the front end of the outer casing (1), to install the taper head (2) and to install the second liquid-proof ring (7). The inner diameter of the second liquid-repellent ring (7) is slidably matched with the outer diameter (26) of the taper head (2), and the outer diameter of the second liquid-repellent ring (7) is slidably matched with the inner diameter of the cavity (6), and the cavity (6) The outer diameter is matched with the inner diameter of the sheath (8) to prevent air bacteria from intruding into the taper head (2) and the needle, and when in use pushes the top end of the pusher (11) (32) to the second liquid-proof ring (7) Advancing toward the front end of the cavity (6), the second liquid-proof ring (7) is disengaged from the taper head (2), so that the taper head (2) is not constrained by any object, and the inner diameter of the pusher (11) is set at the upper end (21) In interference fit with the step (20) of the slider (13), the structure is provided with a taper interference fit, and once gently reacted, the step (20) of the slider (13) is safely disengaged from the inner diameter of the pusher (11) (21), the front end (17) of the pusher (11) is also provided with a buckle (12) or Buckles (18), the slider (13) comprises The spring (16) is mounted in the front end (17) of the buckle (12) or the point buckle (18) of the push cylinder (11), and the restraining spring (16) is positioned with the slider (13), and is not released by the elastic force. To achieve the elastic release requirement during use, the push cylinder (11) is further provided with a rear end (24) and a first step (36) and a second step (37) of the rear plug (22) to tightly cooperate to prevent the use of falling, when When the nurse uses the pusher (11), the first plane (28) of the slider (13) mounted on the front end (17) of the pusher (11) is automatically mounted to the cavity (6) of the outer casing (1). The second plane (29) of the inner taper head (2) is in contact with each other to form a reaction force, and at the same time, the sheet mushroom type (5) of the slider (13) and the convex ring of the taper head (2) are forced. (4) The interference is fastened, while the step (20) of the slider (13) is separated from the inner diameter (21) of the push cylinder (11), and the T-shape (14) of the slider (13) is forced to pass over the push cylinder ( 11) The buckle (12) or the point buckle (18), and the spring (16) installed at the front end (17) of the push cylinder (11) simultaneously exert its elasticity while the slider (13) together with the taper head (2) The standard needle (27) and the needle tube are slid into the push block (11) and the lug (23) locked to the rear plug (22) is realized. Dew, to ensure that the nurse will not be stabbed by the needle weapon, leading to the infection of AIDS, hepatitis B, hepatitis C and other diseases, to protect the personal safety of the nurse and to prevent the use of the syringe after the use of the syringe to harm the society, the existing technology to overcome the safety syringe can not be thought of, It is a prominent point of the present invention.

Second, the front end of the outer casing (1) is provided with the cavity (6), the top surface of the cavity (6) is provided with a circular hole (35), and the circular hole (35) is also provided with a circular hole convex block (40), and a standard needle is installed ( 27) The outer convex ring (33) is locked to the circular hole projection (40) to ensure that the inner diameter (42) of the standard needle (27) is 6:100 and the front end of the tapered head (2) (3) 6:100 is mutually interference. Achieve the locking effect. A taper head (2) is installed in the cavity (6) of the outer casing (1), and a second liquid retaining ring (7), a second liquid retaining ring (7) and a cavity of the outer casing (1) are also installed in the cavity (6). (6) Interference sliding fit to prevent liquid leakage; the lower end of the casing (1) cavity (6) is also provided with a resistance ring (41) to prevent the subcutaneous needle from being pushed back by the force needle seat, providing safety assurance and also setting the outer diameter (10) An interference fit with the inner diameter (9) of the sheath (8) prevents the bacteria from intruding through the liquid passage hole (30) of the taper head (2), and one of the prominent points of the present invention.

3. The front end of the taper head (2) is set to taper 6:100 (3) and the inner diameter of the standard needle (27) is 6:100. The rear end of the taper head (2) is provided with a convex buckle (4) and a slider (13). The front end of the mushroom-shaped (5) interference tight buckle, the tapered head (2) is also provided with an outer diameter (26) and an inner diameter of the second liquid-proof ring (7), and is placed at the top of the tapered head (2) Through the liquid hole (30), when the slider (13) is under the action of the elastic force, the slider (13) is pushed together with the taper head (2) into the protrusion of the pusher (11) and locked to the rear plug (22). (23), while the liquid of the syringe flows in through the liquid passing hole (30) of the taper head (2) The human body is one of the prominent points of the present invention.

4. The front end (17) of the push cylinder (11) is provided with a buckle (12) or a point buckle (18), and the front end (17) of the push cylinder (11) is further provided with a slider (13) including a spring (16). The buckle (12) or the point buckle (18) is mainly buckled on the pusher (11), and the slider (13) of the front end (17) includes a spring (16) to position the spring (16) before use. Static pressure state; the upper end of the push cylinder (11) is further provided with a groove (31), the groove (31) is mounted with the first liquid-proof ring (25), the inner diameter of the first liquid-proof ring (25) and the outer casing (1) (38) The sliding fit, the upper end of the push cylinder (11) is also provided with an inner diameter (21), the slider (13) is mounted, and the step (20) of the slider (13) is interference-fitted, and the pusher (11) is also provided with a rear end ( 24) a second level interference fit with the first step (36) and the second step (37) of the back plug (22) to prevent the back plug (22) from falling down easily, exposing the needle, causing a stab wound to the human body and endangering the society. One of the prominent points of the present invention.

5. The front end of the slider (13) is provided with a sheet mushroom type (5); the sheet mushroom type (5) is further provided with a groove body (39) formed in a sheet shape, and a rear end of the slider (13) is provided with a T type (14). The slider (13) is further provided with a center hole (34), and the T-shaped (14) of the slider (13) is mounted on the buckle (12) of the pusher (11) or the front end (17) of the point buckle (18). The spring (16) is mainly compressed and positioned to form a static pressure. When the pusher (11) is advanced, the first plane (28) and the taper head of the slider (13) mounted on the front end (17) of the pusher (11) are mounted. The second plane (29) of (2) is connected to the interference, forcing the T-shaped (14) of the slider (13) to push the buckle (12) or the point buckle (18) of the cylinder (11) more than The static pressure spring (16) exerts its elasticity to spring the slider (13) and the taper head (2) together with the standard needle (27) into the push cylinder (11), and the interference locks the rear plug (22). The bump (23) realizes that the needle is not exposed, and one of the prominent points of the present invention.

6. The rear plug (22) center setting lug (23) is installed at the rear end (24) of the push cylinder (11), and the outer diameter of the rear plug (22) is set to a second step, that is, the first step (36) and the The two steps (37) are over-tightened with the rear end (24) of the push cylinder (11), and the step of the slider (13) mounted on the upper end of the push cylinder (11) when the push cylinder (11) is advanced forward ( 20) Pressing the inner diameter (21) of the pusher (11), and sliding the slider (13) together with the taper head (2) with the standard needle (27) into the projection of the locking and rear plug (22) ( 23), to prevent artificial force to open, resulting in the needle out of the dew, hurt personal safety, one of the prominent points of the present invention.

7. The sheath (8) is provided with an inner diameter (9) and an outer diameter (10) of the outer casing (6) of the outer casing (1). The sliding sleeve is tightly fitted to prevent air bacteria from intruding into the tapered head (2) and the standard needle (27). ).

The technical solution of the invention is particularly to highlight the technical structure design of the interchangeable needle type automatic retracting type, to prevent the nurse from being stabbed by the sharp needle during use or after use, thereby realizing the protection of the nurse's personal safety from hepatitis B and hepatitis C, For the purpose of virus transmission such as AIDS, the core of the structural design is that the first plane (28) of the slider (13) automatically intersects the second plane (29) of the taper head (2), while forcing the slider The sheet mushroom type (5) of (13) is interference with the convex buckle (4) of the taper head (2), and the step (20) of the slider (13) is separated from the inner diameter of the pusher cylinder (11) (21) At the same time, the T-shaped (14) of the slider (13) passes over the buckle (12) or the point buckle (18) of the pusher (11), while the spring (16) exerts its elasticity while the slider (13) With the taper head (2) with the standard needle (27) into the pusher (11), while locking the bump (23) of the back plug (22), 6 movements play at the same time, and liquid Continuing to flow into the human body through the through hole (30) of the taper head (2), the present technology has failed to contemplate one of the salient points of the present invention.

A product from the invention to the authorization, the product accessories are also suitable for mold production, whether the mold structure of the accessory can be demoulded, whether the various accessories are suitable for automated or semi-automated equipment assembly, and whether the product is suitable for marketization, and the product of the invention The structural design overcomes the above defects, the outer casing, the sheath, the taper head, the push cylinder, the first liquid retaining ring, the slider, the spring, the rear plug, and the second liquid retaining ring fitting overcome the mold making and the mold structure demoulding Until the automatic production, the realization of unmanned assembly, and the reduction of personnel pollution to the product, these technical elements overcome the three major elements in the application of the invention, namely: invention, conversion production, marketization.

BRIEF DESCRIPTION OF THE DRAWINGS:

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

2 is a schematic view showing the structure of a slider and a tapered headband retracting and locking to a rear plug according to an embodiment of the present invention;

3 is a schematic partial enlarged structural view of an 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 tapered head according to the present invention;

6 is a schematic structural view of a second liquid-repellent ring according to the present invention;

Figure 7 is a schematic view showing the structure of a sheath of the present invention;

8 is a schematic structural view of a buckle of a push barrel according to an embodiment of the present invention;

FIG. 8a is a schematic structural view of a point buckle according to an embodiment of the present invention; FIG.

Figure 9 is a schematic view showing the structure of the plug according to the present invention;

Figure 10 is a schematic structural view of a slider according to the present invention;

Figure 11 is a schematic view showing the structure of a first liquid-repellent ring according to the present invention;

Figure 12 is a schematic view showing the structure of a spring according to the present invention;

Figure 13 is a schematic view showing the structure of a standard needle according to the present invention.

In the figure: 1, coat; 2, taper head; 3, taper head 6: 100; 4, convex buckle ring; 5, flaky mushroom type; 6, cavity; 7, second liquid proof ring; 9, the inner diameter of the sheath; 10, the outer diameter of the cavity; 11, the push cylinder; 12, the buckle; 13, the slider; 14, T-type; 15, the outer diameter of the slider; 16, the spring; 17, the front end; Point type buckle; 19, limit position; 20, step; 21, push barrel inner diameter; 22, back plug; 23, bump; 24, rear end; 25, first liquid proof ring; 26, taper head outer diameter 27, standard needle; 28, first plane; 29, second plane; 30, liquid through hole; 31, groove; 32, tip; 33, convex ring; 34, center hole; 35, round hole; The first step; 37, the second step; 38, the inner diameter of the outer casing; 39, the groove body; 40, the circular hole protrusion; 41, the resistance ring; 42, the standard needle inner diameter of 6:100.

Specific implementation plan:

In the embodiment: referring to FIG. 1 and FIG. 2 and FIG. 3, in the implementation of the present invention, the replaceable needle retractable safety syringe shown in FIG. 1 , FIG. 2 and FIG. 3 includes a jacket 1 and a taper head 2 . The second liquid retaining ring 7, the sheath 8, the push cylinder 11, the first liquid retaining ring 25, the slider 13, the rear plug 22, and the spring 16.

As shown in FIG. 1 , FIG. 2 and FIG. 3 , after the needle-type safety syringe is used, the needle is automatically retracted to the rear end 24 of the push cylinder 11 and locked to the protrusion 23 of the rear plug 22 to ensure that the needle is not exposed and protected. The nurse's personal safety, to prevent the needle weapon exposed, harming personal safety; the front end of the outer casing 1 is provided with a cavity 6, the cavity 6 is mounted with a taper head 2 and the second liquid-proof ring 7 is installed, and the inner diameter of the second liquid-proof ring 7 is tapered with the head 2 The outer diameter 26 is slidably engaged, and the outer diameter of the second liquid-repellent ring 7 is slidably engaged with the inner diameter of the cavity 6. When in use, the top end 32 of the pusher cylinder 11 advances the second liquid-repellent ring 7 toward the front end of the cavity 6, thereby achieving taper. The head 2 is disengaged from the second liquid-repellent ring 7, so that the taper head 2 is not restrained by any object, and the inner diameter 21 and the step 20 of the slider 13 are disposed at the upper end of the push cylinder 11. The interference fit, the structure is provided with a taper interference fit. Once the force is slightly stressed, the step 20 of the slider 13 is safely disengaged from the inner diameter 21 of the push cylinder 11, and the front end of the push cylinder 11 is also provided with a buckle 12 or a point buckle 18, The restraining spring 16 is positioned with the slider 13 and is not released by the elastic force, so as to achieve the elastic force release requirement in use. As shown in FIG. 2 and FIG. 8 , the push cylinder 11 further includes a first step 36 and a second step 37 of the rear end 24 and the rear plug 22 . As shown in FIG. 1, FIG. 3, FIG. 8 and FIG. 8a, the slider 13 includes a spring 16 mounted on the front end 17 of the buckle 12 of the push cylinder 11 or the point buckle 18, as shown in FIG. 2 . At the same time as the nurse pushes the pusher 11 at the same time, the first plane 28 of the slider 13 mounted on the front end 17 of the pusher 11 is automatically brought into contact with the second plane 29 of the taper head 2 mounted in the cavity 6 of the outer casing 1. Applying a reaction force, while forcing the sheet-like mushroom type 5 of the slider 13 and the convex buckle 4 of the taper head 2 to be excessively fastened, while the step 20 of the slider 13 is separated from the inner diameter 21 of the push cylinder 11, while The T-shaped 14 of the slider 13 is forced to pass over the buckle 12 or the point buckle 18 of the push cylinder 11 while being mounted on the front end 17 of the push cylinder 11 in the spring 16 At the same time, it exerts its elasticity, and simultaneously slides the slider 13 together with the taper head 2 with the standard needle 27 and the needle tube into the protrusion 23 of the push barrel 11 to be locked to the back plug 22, so that the needle is not exposed, and the nurse is not prevented from being needled. The sharp stab wounds of the sharp weapon lead to infection of AIDS, hepatitis B, hepatitis C and other diseases. It is a prominent point of the present invention that the protection of the nurse's personal safety and the elimination of the use of the syringe are harmful to the society due to the exposure of the needle weapon.

As shown in FIG. 3 and FIG. 4, the front end of the outer casing 1 is provided with a cavity 6, the top surface of the cavity 6 is provided with a circular hole 35, the circular hole 35 is also provided with a circular hole projection 40, and the outer convex ring 33 of the standard needle 27 is locked. The round hole projection 40 ensures that the 6:100 of the inner diameter 42 of the standard needle 27 and the 6:100 of the front end 3 of the taper head 2 are mutually interferenced to achieve a locking effect. The cavity 6 of the outer casing 1 is provided with a taper head 2, and the cavity 6 is also provided with a second liquid-proof ring 7, and the second liquid-repellent ring 7 is in interference with the cavity 6 of the outer casing 1 to prevent liquid leakage; The lower end of the body 6 is further provided with a resistance ring 41 to prevent the subcutaneous needle from being retracted by the forceful needle seat, providing a safety guarantee, and also providing an outer diameter 10 and an inner diameter 9 of the sheath 8 for an interference sliding fit to prevent the through hole 30 of the taper head 2 Bacterial invasion is one of the prominent points of the present invention.

As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 5, the front end of the taper head 2 is set to have a taper of 6:100 and the inner diameter of the standard needle 27 is 6:100, and the rear end of the taper head 2 is provided with a convex buckle 4 and a sheet-like mushroom type 5 interference buckle at the front end of the slider 13, the taper head 2 is further provided with an outer diameter 26 and an inner diameter interference fit of the second liquid-repellent ring 7, and a liquid-passing hole 30 is provided at the top end of the taper head 2, when the slider 13 under the action of the elastic force, the slider 13 is pushed together with the taper head 2 into the protrusion 23 of the push barrel 11 and locked to the rear plug 22, while the liquid of the syringe flows into the human body through the liquid passage hole 30 of the taper head 2, the present invention One of the highlights.

As shown in FIG. 2, FIG. 3 and FIG. 8, the front end 17 of the push cylinder 11 is provided with a buckle 12 or a point buckle 18, and the front end 17 of the push cylinder 11 is further provided with a slider 13 including a spring 16, a buckle 12 or a point type. The buckle 18 is mainly buckled on the pusher cylinder 11. The slider 13 of the front end 17 includes a spring 16 for positioning, so that the spring 16 forms a static pressure state before use; the upper end of the push cylinder 11 is further provided with a groove 31, and the groove 31 is mounted first. The liquid-repellent ring 25, the first liquid-proof ring 25 is slidably engaged with the inner diameter 38 of the outer casing 1, and the inner diameter 21 is further disposed at the upper end of the push cylinder 11, and the slider 13 is mounted to cooperate with the step 20 of the slider 13, and the push-tube 11 is further The rear end 24 and the first step 36 and the second step 37 of the rear plug 22 are provided with a second-level interference fit to prevent the back plug 22 from falling down, exposing the needle, causing a stab wound to the human body and endangering the society. One.

As shown in FIG. 3 and FIG. 10, the front end of the slider 13 is provided with a sheet mushroom type 5; the sheet mushroom type 5 is further provided with a groove 39 formed in a sheet shape, a rear end of the slider 13 is provided with a T shape 14, and the slider 13 is also provided. The central hole 34, the T-shaped 14 of the slider 13 is mounted on the buckle 12 of the push cylinder 11 or the front end 17 of the point buckle 18, and mainly compresses and positions the spring 16 to form a static pressure. When the push cylinder 11 advances, it is installed at The first plane 28 of the slider 13 of the front end 17 of the push cylinder 11 is in contact with the second plane 29 of the taper head 2, forcing the T-shaped 14 of the slider 13 to push the buckle 12 or the point buckle of the push cylinder 11 18. At the same time, the static pressure spring 16 exerts its elasticity, and the slider 13 and the taper head 2 are brought into the push cylinder 11 together with the standard needle 27, and the bumps 23 of the back plug 22 are locked by the interference, so that the needle is not exposed. One of the prominent points of the present invention.

As shown in FIG. 2 and FIG. 9, the centrally disposed projection 23 of the rear plug 22 is mounted on the rear end 24 of the push cylinder 11, and the outer diameter of the rear plug 22 is provided with two steps, that is, the first step 36 and the second step 37 are pushed. The rear end 24 of the barrel 11 is over-tightened. When the push barrel 11 is advanced, the step 20 of the slider 13 mounted on the upper end of the push barrel 11 is pressed away from the inner diameter 21 of the push barrel 11, and the slider 13 is tapered together. The head 2 is accompanied by a standard needle 27 to be elastically engaged with the projection 23 of the locking and rear plug 22 to prevent the artificial forced pull-out, resulting in the needle being detached from the dew, thereby damaging the personal safety, and one of the prominent points of the present invention.

As shown in Fig. 1, the sheath 8 is provided with an inner diameter 9 and an outer diameter 10 of the cavity 6 of the outer casing 1 which is excessively slidably sleeved to prevent air bacteria from intruding into the tapered head 2 and the standard needle 27.

Claims

A replaceable needle type retracting type safety syringe, comprising a jacket (1), a sheath (8), a taper head (2), a pusher cylinder (11), a first liquid retaining ring (25), and a slider (13) a spring (16), a rear plug (22), and a second liquid retaining ring (7), characterized in that the needle is automatically retracted to the rear end of the pusher (11) after use of the replaceable needle type safety syringe ( 24), and locked to the bump (23) of the back plug (22), the needle is not exposed, the front end of the outer casing (1) is provided with a cavity (6), and the cavity (6) is mounted a taper head (2) and a second liquid retaining ring (7), the inner diameter of the second liquid retaining ring (7) is slidably engaged with the outer diameter (26) of the taper head (2), the second defense The outer diameter of the liquid ring (7) is slidingly matched with the inner diameter of the cavity (6), and the outer diameter of the cavity (6) is tightly fitted with the inner diameter of the sheath (8) to prevent air bacteria from intruding into the tapered head ( 2) and a needle, the upper end of the push cylinder (11) is provided with an inner diameter (21) and an interference fit of the step (20) of the slider (13), and the front end (17) of the push cylinder (11) is also provided with a buckle a ring (12) or a point buckle (18), the slider (13) comprising a buckle (12) or a point buckle (18) on which the spring (16) is mounted on the pusher (11) In the front end (17), the push cylinder (11) is further provided with a rear end (24) and a first step (36) and a second step (37) of the back plug (22). The pusher (11) is pushed by the nurse while in use, and the first plane (28) of the slider (13) mounted at the front end (17) of the pusher (11) is automatically mounted to the outer casing (1) The second plane (29) of the tapered head (2) in the cavity (6) is in contact with the interference, forming a sheet mushroom type (5) for applying the reaction force while forcing the slider (13) The convex buckle (4) of the taper head (2) is automatically tightened and fastened, while the step (20) of the slider (13) is separated from the inner diameter (21) of the pusher (11), At the same time, the T-shape (14) of the slider (13) is forced to pass over the buckle (12) or the point buckle (18) of the push cylinder (11) while being mounted at the front end of the push cylinder (11). The spring (16) in (17) simultaneously exerts its elasticity, while the slider (13) is slid into the push cylinder together with the tapered head (2) with a standard needle (27) and a needle tube (11). ) locking the protrusion (23) of the back plug (22), preventing the needle from being exposed, ensuring that the nurse will not be stabbed by the needle sharpener, resulting in AIDS, hepatitis B, hepatitis C and other infectious pathogens, to protect the personal safety of nurses and put an end to the syringe after use because the exposed needle weapon harm to society.
The interchangeable needle retracting safety syringe according to claim 1, characterized in that: the front end of the outer casing (1) is provided with a cavity (6), and the top end of the cavity (6) is provided with a circular hole (35), and a circular hole (35) A circular hole projection (40) is also provided. When the standard needle (27) is mounted, the padlock is attached to the outer convex ring (33), and the cavity (6) of the outer casing (1) is fitted with a taper head (2), the cavity ( 6) The second liquid-proof ring (7) is also installed with the cavity (6) of the outer casing (1) to prevent the liquid from leaking; the outer casing (1) A resistance ring (41) is also arranged at the lower end of the cavity (6) to prevent the subcutaneous needle from being retracted by the force needle seat, and the outer diameter (10) is also provided with an inner diameter (9) of the sheath (8) to prevent the taper. The liquid passage hole (30) of the head (2) is invaded by bacteria.
The interchangeable needle retractable safety syringe according to claim 1, wherein the front end of the taper head (2) is set to have a taper of 6:100 (3) and an inner diameter of the standard needle (27) of 6:100 (42). Cooperating with each other, the rear end of the taper head (2) is provided with a convex buckle (4) and a mushroom-shaped (5) interference buckle at the front end of the slider (13), and the tapered head (2) is also provided with an outer diameter (26) and The second liquid-proof ring (7) has an inner diameter interference fit, and a liquid-passing hole (30) is arranged at the top end of the taper head (2). When the slider (13) is under the elastic force, the slider (13) is combined with the taper head ( 2) The bump (23) which is locked into the pusher (11) and locked to the rear plug (22), and the liquid of the syringe flows into the human body through the liquid passing hole (30) of the taper head (2).
The interchangeable needle retractable safety syringe according to claim 1, characterized in that the front end (17) of the push cylinder (11) is provided with a buckle (12) or a point buckle (18), and the push cylinder (11) The front end (17) also has a slider (13) including a spring (16), and the buckle (12) or the point buckle (18) is mainly biased to a slider mounted on the front end (17) of the pusher (11) ( 13) including the spring (16) positioning, so that the spring (16) forms a static pressure state before use; the upper end of the push cylinder (11) is also provided with a groove (31), and the groove (31) is mounted with the first liquid-proof ring (25) The first liquid-proof ring (25) is slidably engaged with the inner diameter (38) of the outer casing (1), and the inner diameter (21) of the upper end of the push cylinder (11) is also provided, and the slider (13) is mounted, and the slider (13) The step (20) has an interference fit, and the push barrel (11) furtherly provides a second level interference fit between the rear end (24) and the first step (36) and the second step (37) of the back plug (22) to prevent the back plug. (22) It is easy to fall, expose the needle, causing the body to stab and harm the society.
The interchangeable needle retracting type safety syringe according to claim 1, wherein a front end of the slider (13) is provided with a mushroom-shaped mushroom type (5), and a slab-shaped mushroom type (5) is further provided with a groove body (39). ) formed into a sheet shape, the rear end of the slider (13) is provided with a T-shaped (14), the slider (13) is also provided with a center hole (34), and the T-shaped (14) of the slider (13) is mounted on the push barrel (11) The front end (17) of the buckle (12) or the point buckle (18) mainly compresses and positions the spring (16) to form a static pressure. When the pusher (11) advances forward, it is installed at the front end of the pusher (11). The first plane (28) of the slider (13) of (17) is in contact with the second plane (29) of the taper head (2), forming a T-shaped force that applies a reaction force while forcing the slider (13) ( 14) The push ring (12) or the point buckle (18) of the pusher (11) is pushed too much, while the spring (16) under static pressure exerts its elasticity to bring the slider (13) and the taper head (2) together. The standard needle (27) is slid into the pusher (11) together, and the bump (23) of the back plug (22) is locked by the interference to prevent the needle from being exposed.
The interchangeable needle retractable safety syringe according to claim 1, characterized in that the central plug (23) of the rear plug (22) is mounted on the rear end (24) of the push cylinder (11), and the rear plug ( 22) The outer diameter of the 22) is set to two steps, that is, the first step (36) and the second step (37) are over-tightened with the rear end (24) of the push cylinder (11), and when the push cylinder (11) advances forward When the step (20) of the slider (13) installed at the upper end of the pusher (11) is pressed away from the inner diameter (21) of the pusher (11), the slider (13) is coupled with the taper head (2). The needle (27) is springed into the locking piece (23) of the locking and rear plug (22) to prevent the artificial force from being pulled apart, causing the needle to come off the dew and harming the person.
The interchangeable needle retracting safety syringe according to claim 1, wherein the sheath (8) is provided with an inner diameter (9) and an outer diameter (10) of the outer casing (6) of the outer casing (1). Tightening prevents airborne bacteria from invading the tapered head (2) and the standard needle (27).