Improved double-helix injector with reverse design

Abstract

The utility model discloses a double-helix reverse design improved injector which comprises a shell, a piston movably connected to the inner wall of the shell, a push rod fixedly connected to the bottom of the piston, a threaded circular plate movably connected to the outer wall of the push rod, a first external thread arranged on the outer wall of the threaded circular plate, and a first internal thread arranged at the bottom of the inner wall of the shell and meshed with the first external thread. The bottom of the push rod is fixedly connected with a clamping block, the bottom of the clamping block is fixedly connected with a connecting rod, the bottom of the connecting rod is fixedly connected with a round handle, the top of the shell is fixedly connected with a conical opening, the outer wall of the conical opening is provided with a pintle, the outer wall of the conical opening is provided with a second external thread, and the pintle is internally provided with a second internal thread meshed with the second external thread. The top of the pintle is fixedly connected with a needle. According to the utility model, the external threads are arranged on the outer wall of the conical opening, and the threads meshed with each other are arranged on the inner wall of the pintle, so that the needle head is prevented from falling off from the pintle, and meanwhile, the arranged threaded circular plate also prevents the piston push rod from falling off from the inside of the shell.

Description

Technical Field

[0001] The utility model relates to the technical field of medical appliances, in particular to an improved syringe with a double-helix reverse design. Background Art

[0002] Disposable syringes offer advantages such as reliable sterilization, low cost, and easy access, making them widely used in nursing applications such as injections, blood draws, and medication dispensing. After years of exploration and clinical practice, the application of disposable syringes is no longer limited to the nursing field, but has gradually expanded to many related industries, including medical treatment, plastic surgery, anesthesia, surgery, and pharmaceuticals.

[0003] The disposable syringe has a simple structure, and the needle, needle cap and piston push rod are assembled by plugging and pulling. Although this makes the assembly of the syringe convenient, there is a disadvantage that the needle and piston push rod are easy to fall off, resulting in contamination of the needle or piston push rod. Summary of the Invention

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose an improved syringe with a double-helix reverse design.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solution: it includes a shell, the inner wall of the shell is movably connected to a piston, the bottom of the piston is fixedly connected to a push rod, the outer wall of the push rod is movably connected to a threaded circular plate, the outer wall of the threaded circular plate is provided with a first external thread, the bottom of the inner wall of the shell is provided with a first internal thread engaged with the first external thread, the bottom of the push rod is fixedly connected to a clamping block, the bottom of the clamping block is fixedly connected to a connecting rod, the bottom of the connecting rod is fixedly connected to a round handle, the top of the shell is fixedly connected to a tapered mouth, the outer wall of the tapered mouth is installed with a needle bolt, the outer wall of the tapered mouth is provided with a second external thread, the inside of the needle bolt is provided with a second internal thread engaged with the second external thread, and the top of the needle bolt is fixedly connected to a needle.

[0006] As a further description of the above technical solution:

[0007] The first external thread and the second external thread have opposite thread rotation directions, and the first internal thread and the second internal thread have opposite thread rotation directions.

[0008] As a further description of the above technical solution:

[0009] A triangular support is fixedly connected between the bottom of the piston and the outer wall of the push rod, and the number of the triangular supports is two.

[0010] As a further description of the above technical solution:

[0011] A card slot is provided at the bottom of the threaded circular plate, the size of which is the same as that of the card block; a sealing ring is fixedly installed on the top of the threaded circular plate, and the diameter of the sealing ring is equal to the diameter of the push rod.

[0012] As a further description of the above technical solution:

[0013] A support plate is fixedly connected to the bottom of the outer wall of the shell, and the number of the support plates is two.

[0014] As a further description of the above technical solution:

[0015] The bottom of the inner wall of the shell is fixedly connected to a limiting ring, and the limiting ring is located above the first internal thread.

[0016] As a further description of the above technical solution:

[0017] A rubber ring is sleeved and installed on the bottom of the outer wall of the cone mouth, the bottom of the rubber ring is fixedly connected to the top of the shell, the bottom of the pintle is fitted with the top of the rubber ring, and the outer wall of the pintle is connected to a protective tube.

[0018] The utility model has the following beneficial effects:

[0019] 1. Compared with the prior art, the improved syringe with double helix reverse design is provided with a first external thread and a first internal thread. When in use, the round handle is pushed, and the round handle drives the connecting rod to move, and the connecting rod drives the clamping block to move, so that the clamping block engages with the clamping groove at the bottom of the threaded circular plate, driving the threaded circular plate to move to the bottom of the shell. The round handle is twisted, and the round handle drives the connecting rod to rotate, and the connecting rod drives the threaded circular plate to rotate. The threaded circular plate rotates to engage the first external thread and the first internal thread until the top of the threaded circular plate contacts the bottom of the limit ring and stops. Compared with the prior art, the push rod is easy to slip out of the inside of the shell. The improved syringe with double helix reverse design avoids the phenomenon that the piston push rod slips out of the inside of the shell, causing the piston push rod to be contaminated.

[0020] 2. Compared with the existing technology, this improved syringe with a double-helix reverse design has a second external thread and a second internal thread. When in use, the bottom of the needle plug is aligned with the top of the cone mouth, and the needle plug is twisted. The needle plug rotates to engage the second internal thread and the second external thread until the bottom of the needle plug contacts the top of the rubber ring. Compared with the existing technology, the needle is easy to fall off the needle plug. This improved syringe with a double-helix reverse design avoids the needle falling off the needle plug and causing needle contamination. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a front view of the internal structure of the utility model;

[0023] Figure 3 This is a schematic diagram of the internal structure of the utility model;

[0024] Figure 4 It is an enlarged view of the local structure of the utility model.

[0025] Figure 5 It is an enlarged view of the internal structure of the utility model.

[0026] Legend:

[0027] 1. Housing; 2. Piston; 3. Push rod; 4. Triangular support; 5. Clamping block; 6. Connecting rod; 7. Round handle; 8. Limiting ring; 9. Threaded circular plate; 10. Clamping groove; 11. Support plate; 12. Sealing ring; 13. Rubber ring; 14. Conical mouth; 15. Pintle; 16. Needle; 17. Protective tube; 18. First external thread; 19. First internal thread; 20. Second external thread; 21. Second internal thread. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0029] Reference Figure 1-5 The utility model provides an improved double-helix reverse design syringe: it includes a shell 1, the inner wall of the shell 1 is movably connected to a piston 2, the bottom of the piston 2 is fixedly connected to a push rod 3, the push rod 3 drives the piston 2 to move, the outer wall of the push rod 3 is movably connected to a threaded circular plate 9, the threaded circular plate 9 limits the piston 2, the outer wall of the threaded circular plate 9 is provided with a first external thread 18, the bottom of the inner wall of the shell 1 is provided with a first internal thread 19 that meshes with the first external thread 18, which facilitates the threaded connection between the threaded circular plate 9 and the inner wall of the shell 1, the bottom of the push rod 3 is fixedly connected to a clamping block 5, the bottom of the clamping block 5 The top of the shell 1 is fixedly connected with a connecting rod 6 to improve the stability of the structure. The bottom of the connecting rod 6 is fixedly connected with a round handle 7. The round handle 7 is pushed to move, and the round handle 7 drives the connecting rod 6 to move, and the connecting rod 6 drives the block 5 to move. The top of the shell 1 is fixedly connected with a cone mouth 14, and a pintle 15 is installed on the outer wall of the cone mouth 14. The outer wall of the cone mouth 14 is provided with a second external thread 20, and the inside of the pintle 15 is provided with a second internal thread 21 that meshes with the second external thread 20, which facilitates the threaded connection between the cone mouth 14 and the pintle 15. The top of the pintle 15 is fixedly connected with a needle 16, which is beneficial to improving the efficiency of the device.

[0030] The first external thread 18 and the second external thread 20 have opposite thread rotation directions, and the first internal thread 19 and the second internal thread 21 have opposite thread rotation directions, which avoids mutual influence when the threads rotate and improves the overall stability of the device.

[0031] like Figure 3 and Figure 5 As shown, a triangular support 4 is fixedly connected between the bottom of the piston 2 and the outer wall of the push rod 3. There are two triangular supports 4, which improve the stability of the piston 2 and the push rod 3. A support plate 11 is fixedly connected to the bottom of the outer wall of the outer shell 1. There are two support plates 11, which facilitates the use of the device. A limiting ring 8 is fixedly connected to the bottom of the inner wall of the outer shell 1. The limiting ring 8 is located above the first internal thread 19. The limiting ring 8 limits the threaded circular plate 9.

[0032] like Figure 3 As shown, a card slot 10 is provided at the bottom of the threaded circular plate 9. The size of the card slot 10 is the same as that of the card block 5, which is conducive to the card block 5 driving the card slot 10 to rotate. A sealing ring 12 is fixedly installed on the top of the threaded circular plate 9. The diameter of the sealing ring 12 is equal to the diameter of the push rod 3, which improves the sealing performance of the device.

[0033] like Figure 3 As shown, a rubber ring 13 is sleeved and installed on the bottom of the outer wall of the cone mouth 14, and the bottom of the rubber ring 13 is fixedly connected to the top of the shell 1. The bottom of the needle plug 15 fits with the top of the rubber ring 13, which improves the sealing performance of the device. The outer wall of the needle plug 15 is connected to a protective tube 17, which is beneficial to the protection of the needle 16.

[0034] Working principle: When in use, push the round handle 7, the round handle 7 drives the connecting rod 6 to move, and the connecting rod 6 drives the block 5 to move, so that the block 5 engages with the slot 10 at the bottom of the threaded circular plate 9, driving the threaded circular plate 9 to move to the bottom of the shell 1, twist the round handle 7, the round handle 7 drives the connecting rod 6 to rotate, and the connecting rod 6 drives the threaded circular plate 9 to rotate. The threaded circular plate 9 rotates to engage the first external thread 18 and the first internal thread 19 until the top of the threaded circular plate 9 contacts the bottom of the limit ring 8 and stops. After that, align the bottom of the pintle 15 with the top of the tapered mouth 14, twist the pintle 15, and the pintle 15 rotates to engage the second internal thread 21 and the second external thread 20 until the bottom of the pintle 15 contacts the top of the rubber ring 13.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A double-helix reverse design improved syringe, comprising a housing (1), characterized in that: The inner wall of the shell (1) is movably connected to a piston (2), the bottom of the piston (2) is fixedly connected to a push rod (3), the outer wall of the push rod (3) is movably connected to a threaded circular plate (9), the outer wall of the threaded circular plate (9) is provided with a first external thread (18), the bottom of the inner wall of the shell (1) is provided with a first internal thread (19) meshing with the first external thread (18), the bottom of the push rod (3) is fixedly connected to a clamping block (5), the bottom of the clamping block (5) is fixedly connected to a connecting rod (6), the bottom of the connecting rod (6) is fixedly connected to a round handle (7), the top of the shell (1) is fixedly connected to a cone mouth (14), the outer wall of the cone mouth (14) is provided with a needle bolt (15), the outer wall of the cone mouth (14) is provided with a second external thread (20), the inside of the needle bolt (15) is provided with a second internal thread (21) meshing with the second external thread (20), and the top of the needle bolt (15) is fixedly connected to a needle head (16).

2. The improved double-helix reverse design syringe according to claim 1, characterized in that: The first external thread (18) and the second external thread (20) have opposite thread rotation directions, and the first internal thread (19) and the second internal thread (21) have opposite thread rotation directions.

3. The improved double-helix reverse design syringe according to claim 1, characterized in that: A triangular support (4) is fixedly connected between the bottom of the piston (2) and the outer wall of the push rod (3), and the number of the triangular supports (4) is two.

4. The improved double-helix reverse design syringe according to claim 1, characterized in that: A clamping groove (10) is provided at the bottom of the threaded circular plate (9), and the size of the clamping groove (10) is the same as the size of the clamping block (5). A sealing ring (12) is fixedly installed on the top of the threaded circular plate (9), and the diameter of the sealing ring (12) is equal to the diameter of the push rod (3).

5. The improved double-helix reverse design syringe according to claim 1, characterized in that: A support plate (11) is fixedly connected to the bottom of the outer wall of the housing (1), and the number of the support plates (11) is two.

6. The improved double-helix reverse design syringe according to claim 5, characterized in that: A limiting ring (8) is fixedly connected to the bottom of the inner wall of the housing (1), and the limiting ring (8) is located above the first internal thread (19).

7. The improved double-helix reverse design syringe according to claim 1, characterized in that: A rubber ring (13) is sleeved and installed on the bottom of the outer wall of the cone mouth (14), the bottom of the rubber ring (13) is fixedly connected to the top of the shell (1), the bottom of the pintle (15) is in contact with the top of the rubber ring (13), and the outer wall of the pintle (15) is connected to a protective tube (17).

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