Syringe

Abstract

The utility model relates to the technical field of medical instruments, and discloses an injector which comprises a cylinder body, a threaded connection port arranged on the end face of the cylinder body and a piston rod body arranged in the cylinder body in a sliding mode. The limiting assembly comprises an extension rod fixedly installed on the end face, away from the threaded connection port, of the barrel, an installation base is fixedly installed on the end face of the extension rod, a fixed barrel is fixedly installed on the side face, close to the barrel, of the installation base, a threaded rod is rotationally arranged on the installation base, and a movable barrel is arranged in the fixed barrel. An auxiliary nut in threaded connection with the threaded rod is fixedly installed in an inner cavity of the movable cylinder. According to the syringe, an original end opening, connected with the needle head, of the cylinder body is replaced with the threaded connection end opening, the contact area between the end opening and the needle head is increased, it is ensured that the needle head and the cylinder body are tightly connected, the needle head is not prone to falling off in the treatment process, and a pintle does not need to be fixed in the operation process of a nurse.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a syringe. Background Technology

[0002] A syringe is a common medical device, mainly consisting of a syringe barrel with a small hole at the front end and a matching piston rod.

[0003] When using syringes to prepare medication, the high pressure during injection can easily cause medication to splash at the syringe-needle interface, resulting in medication waste and spillage onto the preparation table, nurses' faces, and uniforms. If the needle falls off, a new needle needs to be reconnected, increasing workload and consumables, and potentially injuring nurses and causing occupational exposure. To address these issues, we have proposed a syringe to solve the above problems. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a syringe that solves the problems mentioned in the background.

[0005] This utility model provides the following technical solution: a syringe, comprising: a barrel, a threaded connection port disposed on the end face of the barrel, and a piston rod slidably disposed inside the barrel. The barrel is further provided with a limiting component, which includes an extension rod fixedly mounted on the end face of the barrel away from the threaded connection port. A mounting base is fixedly mounted on the end face of the extension rod. A fixed cylinder is fixedly mounted on the side of the mounting base near the barrel. A threaded rod is rotatably disposed on the mounting base. A movable cylinder is disposed inside the fixed cylinder. An auxiliary nut threadedly connected to the threaded rod is fixedly mounted in the inner cavity of the movable cylinder. A limiting block is fixedly mounted on the end face of the threaded rod. The mounting base is provided with a locking component, which includes a bottom knob fixedly mounted on the end face of the mounting base through which the threaded rod passes. A connecting rod is slidably disposed on the bottom knob. A top knob is fixedly mounted on one end of the connecting rod, and a friction ring is fixedly mounted on the other end of the connecting rod. A return spring is fixedly mounted on the bottom surface of the top knob, and the end of the return spring away from the top knob is fixedly connected to the bottom knob.

[0006] Preferably, a protruding strip is fixedly installed on the inner wall of the fixed cylinder, and a connecting groove is provided on the movable cylinder.

[0007] Preferably, the protrusion engages with the connecting groove, and the fixed cylinder and the movable cylinder are slidably connected to the connecting groove via the protrusion.

[0008] Preferably, the piston rod includes a piston head and a rod fixedly connected to the piston head, and the end face of the movable cylinder can contact the piston head.

[0009] Preferably, the limiting block is located in the inner cavity of the movable cylinder, and the size of the limiting block is larger than the size of the threaded hole of the auxiliary nut.

[0010] Preferably, there are two connecting rods, which are symmetrically arranged on both sides of the central axis of the bottom knob.

[0011] Preferably, the friction ring is located in the internal cavity of the mounting base, and the friction ring can contact the side wall of the inner cavity of the mounting base.

[0012] Preferably, the contact surface between the friction ring and the mounting base is provided with friction patterns to enhance the friction between them.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This syringe increases the contact area between the syringe and the needle by replacing the original needle-connecting port on the syringe body with a threaded connection port, ensuring a tight connection between the needle and the syringe body. During treatment, the needle is less likely to fall off, and nurses do not need to fix the needle plug during operation.

[0015] 2. This syringe, by setting a limiting component on the barrel, restricts the range of motion of the piston rod inside the barrel. This can prevent inexperienced medical personnel from excessively displacing the piston rod when drawing medication, ensuring the accurate amount of medication drawn by the barrel each time and avoiding medication waste, thus meeting the needs of practical applications. Attached Figure Description

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

[0017] Figure 2 This is a side view of the overall structure of this utility model;

[0018] Figure 3 This is a first cross-sectional view of a portion of the structure of this utility model;

[0019] Figure 4 This is a second cross-sectional view of part of the structure of this utility model;

[0020] Figure 5 This is an exploded view of the threaded rod structure of this utility model;

[0021] Figure 6 This is an exploded view of the reset spring structure of this utility model.

[0022] In the diagram: 1. Cylinder body; 2. Threaded connection port; 3. Piston rod body; 4. Limiting assembly; 41. Extension rod; 42. Fixed cylinder; 421. Protruding strip; 43. Mounting base; 44. Movable cylinder; 441. Connecting groove; 45. Threaded rod; 46. Auxiliary nut; 47. Limiting block; 5. Locking assembly; 51. Top knob; 52. Connecting rod; 53. Return spring; 54. Bottom knob; 55. Friction ring. Detailed Implementation

[0023] 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.

[0024] Please see Figure 1-6 A syringe includes: a barrel 1, a threaded connection port 2 disposed on the end face of the barrel 1, and a piston rod 3 slidably disposed inside the barrel 1. A limiting assembly 4 is also provided on the barrel 1. The limiting assembly 4 includes an extension rod 41 fixedly mounted on the end face of the barrel 1 away from the threaded connection port 2. A mounting base 43 is fixedly mounted on the end face of the extension rod 41. A fixed cylinder 42 is fixedly mounted on the side of the mounting base 43 near the barrel 1. A threaded rod 45 is rotatably disposed on the mounting base 43. A movable cylinder 44 is disposed inside the fixed cylinder 42. An auxiliary nut 46 threadedly connected to the threaded rod 45 is fixedly mounted inside the movable cylinder 44. A limiting block 47 is fixedly mounted on the end face of the threaded rod 45. A limiting block 47 is fixedly mounted on the side wall of the inner cavity of the fixed cylinder 42. The protrusion 421 and the movable cylinder 44 are provided with a connecting groove 441. The protrusion 421 and the connecting groove 441 cooperate with each other. The fixed cylinder 42 and the movable cylinder 44 are slidably connected through the protrusion 421 and the connecting groove 441. The piston rod 3 includes a piston head and a rod body fixedly connected to the piston head. The end face of the movable cylinder 44 can contact the piston head, ensuring that the design of the movable cylinder 44 and other structures can meet the purpose of limiting the range of movement of the piston head. The limiting block 47 is located in the inner cavity of the movable cylinder 44, and the size of the limiting block 47 is larger than the size of the threaded hole of the auxiliary nut 46. The limiting block 47 can prevent the movable cylinder 44 from falling off the fixed cylinder 42, ensuring the sliding connection between the movable cylinder 44 and the fixed cylinder 42, and ensuring the rationality of the overall structural design.

[0025] The mounting base 43 is provided with a locking assembly 5, which includes a bottom knob 54 fixedly installed on the threaded rod 45 passing through the end face of the mounting base 43. A connecting rod 52 is slidably installed on the bottom knob 54. A top knob 51 is fixedly installed at one end of the connecting rod 52, and a friction ring 55 is fixedly installed at the other end of the connecting rod 52. A return spring 53 is fixedly installed on the bottom surface of the top knob 51. The end of the return spring 53 away from the top knob 51 is fixedly connected to the bottom knob 54. There are two connecting rods 52, which are symmetrically arranged on both sides of the central axis of the bottom knob 54. The friction ring 55 is located in the internal cavity of the mounting base 43 and can contact the inner cavity side wall of the mounting base 43. Friction grooves are provided on the contact surface between the friction ring 55 and the mounting base 43 to enhance the friction between them, ensuring that the friction ring 55 can form a friction force to lock the movement of the internal structure, thereby improving the stability of the overall structure.

[0026] Working principle: A threaded connection port 2 is provided on the cylinder 1. The threaded connection port 2 allows for the connection of a needle or indwelling needle, increasing the contact area between them and ensuring a stable connection between the cylinder 1 and the needle. When the cylinder 1 draws in the medicine, simply pull the piston rod 3 inside the cylinder 1. Pressing the top knob 51, the friction ring 55 is fixedly connected to the top knob 51 via a connecting rod 52. The connecting rod 52 is slidably connected to the bottom knob 54, which is fixed to the end face of the threaded rod 45. Therefore, pressing the top knob... After turning the top knob 51, a gap is created between the friction ring 55 and the mounting base 43. At this time, the top knob 51 can be turned, and the threaded rod 45 rotates synchronously on the mounting base 43. Because the fixed cylinder 42, which is fixed to the bottom surface of the mounting base 43, is provided with a protrusion 421, and the movable cylinder 44 is provided with a connecting groove 441, the movable cylinder 44 and the fixed cylinder 42 can slide flexibly on the fixed cylinder 42 by utilizing the cooperation between the protrusion 421 and the connecting groove 441. The inner cavity of the movable cylinder 44 is fixed with the threaded rod 45. The auxiliary nut 46 connected by the threaded rod allows the movable cylinder 44 to slide on the fixed cylinder 42 after the threaded rod 45 rotates. The other end face of the movable cylinder 44 can contact the piston head of the piston rod 3, thereby limiting the sliding range of the piston head of the piston rod 3, controlling the size of the cavity formed between the piston head of the piston rod 3 and the cylinder 1, and thus controlling the amount of medicine absorbed by the cylinder 1 at one time, avoiding excessive absorption of medicine by the cylinder 1. After the top knob 51 is loosened, the return spring 53, which is fixedly connected to the top knob 51 and the bottom knob 54 at both ends, drives the cylinder 44 to slide on the fixed cylinder 42. The top knob 51, connecting rod 52, and friction ring 55 slide to eliminate the gap between friction ring 55 and mounting base 43, making friction ring 55 and mounting base 43 in close contact. The friction texture on friction ring 55 can then cooperate with mounting base 43 to generate a certain friction force, which can then restrict the rotation of friction ring 55, thereby restricting the rotation of threaded rod 45 and other structures, locking the position of movable cylinder 44. Mounting base 43 is fixed to cylinder 1 by extension rod 41, which can ensure that movable cylinder 44 has a certain sliding range to meet the needs of cylinder 1 to absorb different amounts of medicine.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A syringe characterized by, Include: The barrel (1), the threaded connection port (2) provided on the end face of the barrel (1), and the piston rod (3) slidingly arranged in the barrel (1), the barrel (1) is further provided with a limiting assembly (4), the limiting assembly (4) includes an extension rod (41) fixedly installed on the end face of the barrel (1) away from the threaded connection port (2), the end face of the extension rod (41) is fixedly installed with a mounting seat (43), the side surface of the mounting seat (43) close to the barrel (1) is fixedly installed with a fixed cylinder (42), a threaded rod (45) is rotationally arranged on the mounting seat (43), the inside of the fixed cylinder (42) is provided with a movable cylinder (44), the inside of the movable cylinder (44) is fixedly installed with an auxiliary nut (46) threadedly connected with the threaded rod (45), the end face of the threaded rod (45) is fixedly installed with a limiting block (47); The mounting seat (43) is provided with a locking assembly (5), the locking assembly (5) includes a bottom knob (54) fixedly installed on the threaded rod (45) penetrating the end face of the mounting seat (43), a connecting rod (52) is slidingly arranged on the bottom knob (54), one end of the connecting rod (52) is fixedly installed with a top knob (51), and the other end of the connecting rod (52) is fixedly installed with a friction ring (55), the bottom surface of the top knob (51) is fixedly installed with a return spring (53), the end of the return spring (53) away from the top knob (51) is fixedly connected with the bottom knob (54).

2. A syringe according to claim 1, wherein The fixed cylinder (42) is fixedly installed with a convex strip (421) on the inner wall of the cavity, and the movable cylinder (44) is provided with a connecting groove (441).

3. A syringe according to claim 2, wherein The convex strip (421) cooperates with the connecting groove (441), and the fixed cylinder (42) and the movable cylinder (44) are slidingly connected through the convex strip (421) and the connecting groove (441).

4. The syringe of claim 1, wherein The piston rod (3) includes a piston head and a rod body fixedly connected with the piston head, and the end face of the movable cylinder (44) can contact the piston head.

5. The syringe of claim 1, wherein The limiting block (47) is located in the inner cavity of the movable cylinder (44), and the size of the limiting block (47) is greater than the size of the threaded hole of the auxiliary nut (46).

6. The syringe of claim 1, wherein The connecting rod (52) is provided with two, and the two connecting rods (52) are symmetrically arranged on both sides of the central axis of the bottom knob (54).

7. The syringe of claim 1, wherein The friction ring (55) is located in the inner cavity of the mounting seat (43), and the friction ring (55) can contact the inner wall of the mounting seat (43).

8. A syringe according to claim 7, wherein The contact surface between the friction ring (55) and the mounting seat (43) is provided with friction lines for enhancing the friction between the mounting seat (43).

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