Disposable PVC syringes

Abstract

This utility model discloses a disposable PVC syringe, including a syringe barrel. A conical head is installed at the top of the syringe barrel, and a piston is slidably installed inside the syringe barrel. An installation rod is installed at the top of the piston, and a stop is fixedly installed at the top of the installation rod. A slider shell is installed on the outside of the conical head, and a slider is slidably installed inside the slider shell. An elastic element is provided between the slider and the inner cavity of the slider shell. A limit component is provided at the bottom of the slider, and a contact surface for abutting the stop is provided on one side of the slider. This utility model uses a push rod to move the piston inside the syringe barrel. Before the liquid is fully propelled, the installation rod and the stop will not enter the conical head. When the liquid needs to be fully propelled, the installation rod and the stop enter the conical head upwards, and the slider blocks the stop, preventing the stop and the installation rod from disengaging from the conical head. This prevents the piston and the push rod from pulling down, thus rendering the syringe unusable.

Description

Technical Field

[0001] This utility model relates to the field of syringes, specifically a disposable PVC syringe. Background Technology

[0002] In the field of medical injection, disposable PVC syringes have become a commonly used instrument in clinical treatment due to their convenience and controllable cost.

[0003] Traditional disposable PVC syringes mostly use a conventional piston-cylinder structure, which is easy to disassemble and assemble. Criminals can reassemble the syringes by cleaning and disinfecting them, resulting in used syringes entering the market. These reused syringes may not only carry pathogens such as viruses and bacteria, causing cross-infection, but also affect injection accuracy due to component wear, threatening the patient's life. Therefore, it is necessary to design a disposable PVC syringe to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a disposable PVC syringe to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a disposable PVC syringe, comprising an injection barrel, a conical head mounted on the top of the injection barrel, a piston slidably mounted in the inner cavity of the injection barrel, an mounting rod mounted on the top of the piston, and a stop block fixedly mounted on the top of the mounting rod;

[0006] A slider housing is installed on the outside of the cone head, and a slider is slidably installed inside the slider housing. An elastic element is provided between the slider and the inner cavity of the slider housing. A limit component is provided at the bottom of the slider, and a contact surface for abutting the stop block is provided on one side of the slider.

[0007] Preferably, the limiting component includes a limiting groove and a limiting block. The limiting groove is formed on the bottom surface of the slider, and the limiting block is fixedly installed in the inner cavity of the slider housing. The limiting block passes through the inside of the limiting groove.

[0008] Preferably, the elastic element is a spring, with one end of the spring mounted on one side of the slider and the other end of the spring mounted on one side of the inner wall of the slider housing.

[0009] Preferably, the stop is cylindrical, and the outer diameter of the stop is larger than the outer diameter of the mounting rod.

[0010] Preferably, a push rod is mounted on the bottom of the piston.

[0011] Preferably, a needle seat is sleeved on the outer side of the cone head;

[0012] Preferably, three sets of locking protrusions are vertically distributed on the inner side of the syringe, the locking protrusions are adhered to the inner wall of the syringe, and the three sets of locking protrusions are located at 2ml, 8ml and 10ml of the inner cavity of the syringe, respectively.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This disposable PVC syringe, during use, moves the piston within the syringe barrel by pushing the plunger. Before the medication is fully propelled, the mounting rod and stop will not enter the conical head. When the medication needs to be fully propelled, the mounting rod and stop move upwards into the conical head. The conical head, in contact with the contact surface, pushes the slider within the slider housing. After the stop passes the slider, the slider faces the mounting rod. Under the action of the spring, the slider moves and stops below the stop, preventing the stop from disengaging downwards from the conical head. This prevents the stop, mounting rod, piston, and plunger from moving downwards, rendering the syringe unusable. Its self-locking mechanism after a single use prevents misuse by criminals.

[0015] 2. This disposable PVC syringe, when preparing the heparin saline solution for interventional surgery, draws 2ml of heparin to the 2ml stop, then draws normal saline. With a slight pull of the plunger, it passes the 2ml and 8ml stops, causing the piston to be stopped by the 10ml stop. At this point, the syringe contains a total of 10ml of heparin saline solution. A slight push of the plunger then expels 2ml of solution, and the piston moves to the 8ml stop. Then, normal saline is drawn again, and the piston passes the 8ml stop to the 10ml stop, thus completing the preparation of the commonly used 10ml diluted heparin saline solution for interventional surgery. The preparation is relatively convenient. When the piston passes the stop protrusion, the operator needs to apply more force when pushing or pulling, thus providing a tactile indication of the volume of liquid drawn or pushed. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0018] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 4 This is an enlarged structural diagram of point A in this utility model;

[0020] Figure 5 This is an enlarged structural diagram of section B of the present invention.

[0021] In the diagram: 1. Injector; 2. Cone; 3. Needle seat; 4. Piston; 5. Push rod; 6. Mounting rod; 7. Stop; 8. Slider housing; 9. Slider; 10. Limiting groove; 11. Limiting block; 12. Contact surface; 13. Spring; 14. Locking protrusion. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1

[0024] Please refer to Figure 1-4 As shown, this utility model provides a disposable PVC syringe, including a syringe barrel 1, a cone head 2 installed on the top of the syringe barrel 1, a piston 4 slidably installed in the inner cavity of the syringe barrel 1, an installation rod 6 installed on the top of the piston 4, and a stop block 7 fixedly installed on the top of the installation rod 6;

[0025] A slider housing 8 is installed on the outside of the cone head 2, and a slider 9 is slidably installed inside the slider housing 8. An elastic element is provided between the slider 9 and the inner cavity of the slider housing 8. A limit component is provided at the bottom of the slider 9, and a contact surface 12 for abutting the stop block 7 is provided on one side of the slider 9.

[0026] Specifically, by pushing the push rod 5, the piston 4 moves inside the syringe barrel 1. Before the liquid is completely pushed, the mounting rod 6 and the stop block 7 will not enter the cone head 2. When it is necessary to push the liquid completely, the mounting rod 6 and the stop block 7 move upward into the cone head 2, and the slider 9 blocks the stop block 7, so that the stop block 7 and the mounting rod 6 cannot disengage from the cone head 2, and the piston 4 and the push rod 5 cannot be pulled down, thus making the syringe unusable.

[0027] The limiting component includes a limiting groove 10 and a limiting block 11. The limiting groove 10 is opened on the bottom surface of the slider 9, and the limiting block 11 is fixedly installed in the inner cavity of the slider housing 8. The limiting block 11 passes through the inside of the limiting groove 10 and is always located inside the limiting groove 10, so that the slider 9 cannot move outward too far and thus detach from the slider housing 8.

[0028] Specifically, the elastic element is spring 13. One end of spring 13 is installed on one side of slider 9, and the other end of spring 13 is installed on one side of the inner wall of slider housing 8. After the stop block 7 abuts against the contact surface 12 and drives slider 9 to move, spring 13 will be compressed. When the stop block 7 disengages from abutting slider 9, spring 13 will reset and push slider 9 to move.

[0029] Wherein: the stop block 7 is cylindrical, the outer diameter of the stop block 7 is larger than the outer diameter of the mounting rod 6, the stop block 7 can move upward to abut against the slider 9 while the mounting rod 6 cannot abut against the slider 9.

[0030] Wherein: A push rod 5 is installed at the bottom of the piston 4, and the position of the piston 4 can be changed by the push rod 5 to push and draw liquid. A needle seat 3 is sleeved on the outside of the cone head 2, and the cone head 2 is connected to the needle seat 3, so that injection is performed through the needle.

[0031] The syringe 1 has three sets of locking protrusions 14 vertically distributed on its inner side. These protrusions 14 are adhered to the inner wall of the syringe 1, and are located at 2ml, 8ml, and 10ml of the syringe cavity, respectively. When the piston 4 moves to a locking protrusion 14, the protrusion gently blocks it, increasing the resistance the operator feels when pushing or pulling. However, forceful pushing or pulling can also cause the piston 4 to compress and pass through the locking protrusion 14, thus preparing the heparinized saline solution required for the interventional procedure. When diluting the solution, draw 2 ml of heparin to the 2 ml stop position, then draw normal saline. Pull the plunger slightly to pass the 2 ml and 8 ml stop positions, so that piston 4 is blocked by the 10 ml stop position. At this time, there is a total of 10 ml of heparin saline solution in syringe 1. Push the plunger 5 slightly to expel 2 ml of solution. Piston 4 moves to the 8 ml stop position and stops. Then draw normal saline again, and piston 4 passes the 8 ml stop position to 10 ml, thus completing the 10 ml dilution of heparin saline solution commonly used in interventional surgery.

[0032] Working principle: This utility model is a disposable PVC syringe. During use, pushing the push rod 5 drives the piston 4 to move inside the syringe barrel 1. Before the liquid is completely pushed, the mounting rod 6 and the stop block 7 will not enter the cone head 2. When it is necessary to push the liquid completely, the mounting rod 6 and the stop block 7 move upward into the cone head 2. The cone head 2 abuts against the contact surface 12, pushing the slider 9 to move inside the slider housing 8. After the stop block 7 passes the slider 9, the slider 9 faces the mounting rod 6. Under the action of the spring 13, the slider 9 is pushed to move and block below the stop block 7. At this time, the stop block 7 cannot move downward out of the cone head 2, so the stop block 7, the mounting rod 6, the piston 4, and the push rod 5 cannot move downward, making the syringe unusable. It is self-locking after a single use to prevent it from being used by criminals.

[0033] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A disposable PVC syringe, comprising a syringe barrel (1), characterized in that: A cone (2) is installed on the top of the syringe (1), a piston (4) is slidably installed in the inner cavity of the syringe (1), an installation rod (6) is installed on the top of the piston (4), and a stop (7) is fixedly installed on the top of the installation rod (6). A slider housing (8) is installed on the outside of the cone (2), and a slider (9) is slidably installed inside the slider housing (8). An elastic element is provided between the slider (9) and the inner cavity of the slider housing (8). A limit component is provided at the bottom of the slider (9), and a contact surface (12) for abutting the stop block (7) is provided on one side of the slider (9).

2. A disposable PVC syringe according to claim 1, characterized in that: The limiting component includes a limiting groove (10) and a limiting block (11). The limiting groove (10) is opened on the bottom surface of the slider (9), and the limiting block (11) is fixedly installed in the inner cavity of the slider shell (8). The limiting block (11) passes through the inside of the limiting groove (10).

3. A disposable PVC syringe according to claim 1, characterized in that: The elastic element is specifically a spring (13), one end of which is mounted on one side of the slider (9), and the other end of which is mounted on one side of the inner wall of the slider housing (8).

4. A disposable PVC syringe according to claim 1, characterized in that: The stop block (7) is cylindrical, and the outer diameter of the stop block (7) is larger than the outer diameter of the mounting rod (6).

5. A disposable PVC syringe according to claim 1, characterized in that: A push rod (5) is mounted on the bottom of the piston (4).

6. A disposable PVC syringe according to claim 1, characterized in that: The cone (2) is fitted with a needle seat (3) on its outer side.

7. A disposable PVC syringe according to claim 1, characterized in that: The syringe (1) has three sets of locking protrusions (14) vertically distributed on the inner side. The locking protrusions (14) are bonded to the inner wall of the syringe (1), and the three sets of locking protrusions (14) are located at 2ml, 8ml and 10ml in the inner cavity of the syringe (1) respectively.

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