Propelling and withdrawing device of piston push rod under tiny structure

Abstract

The invention discloses a propelling and withdrawing device for a piston push rod under a tiny structure, and belongs to the technical field of medical auxiliary instruments. The propelling and withdrawing device comprises a push rod and a rubber plug. The push rod comprises a push rod head, a connecting rod and a rod body. The push rod head is of a big-end-back circular truncated cone structure. The rubber plug comprises a columnar head part and a skirt edge, the skirt edge and the columnar head part are connected into a whole, and the skirt edge is composed of at least two skirt petals; a cavity is formed in the skirt edge in the extending direction of the columnar head and comprises a head containing cavity and a connecting rod containing cavity, and a blocking shoulder is formed between the head containing cavity and the connecting rod containing cavity. According to the pushing and withdrawing device of the piston push rod under the tiny structure, through reasonable structural design, the excellent sealing performance, the precise control capacity and the stable operation characteristic are achieved, the occupied area of fine operation in a tiny space is reduced, the reusability of the needle cylinder push rod is achieved, and the service life of the needle cylinder push rod is prolonged. Wide application prospects are realized in the medical field.

Description

Technical Field

[0001] This invention belongs to the field of medical auxiliary device technology, specifically relating to a piston push rod advancement and retraction device with a microstructure. Background Technology

[0002] A typical commercially available disposable syringe consists of a syringe barrel, a rubber piston, and a plunger. To control the movement of the plunger and plunger assembly, the plunger is operated at its end, transmitting the motion to the plunger inside the syringe barrel. The plunger provides a seal within the syringe. The rubber piston and plunger are assembled together; once assembled, the plunger cannot be separated and is not reusable.

[0003] However, in special cases with limited volume, such as inside in vitro diagnostic instruments, the complete set of syringe plunger pistons would occupy a large volume. Therefore, a reusable piston plunger advance and retraction device with a miniaturized structure is needed. Summary of the Invention

[0004] To address the aforementioned problems, this invention discloses a piston push rod advancement and retraction device with a microstructure. The push rod is reusable, and under the microstructure, one push rod corresponds to multiple rubber stoppers, matching different syringes, thereby reducing the occupied area, which is worthy of application and promotion.

[0005] To achieve the above objectives, the specific technical solution of this application is as follows: A piston push rod advance and retraction device with a microstructure includes a push rod and a rubber plug; The push rod includes a push rod head, a connecting rod, and a rod body. The push rod head is a frustum structure that is smaller at the front and larger at the back. The rubber stopper includes a cylindrical head and a skirt. The skirt is connected to the cylindrical head as a whole. The skirt is composed of no less than two skirt petals, which converge inward to form a complete ring. A cavity is provided inside the skirt in the direction extending towards the cylindrical head. The cavity includes a head receiving cavity and a connecting rod receiving cavity. The head receiving cavity converges into a frustum shape to cooperate with the push rod head. The connecting rod receiving cavity converges into a cylinder shape to cooperate with the connecting rod. A shoulder is formed between the head receiving cavity and the connecting rod receiving cavity.

[0006] Based on the above technical features, furthermore, the diameter of the connecting rod of the push rod is smaller than the diameter of the bottom surface of the push rod head and the diameter of the rod body.

[0007] Based on the above technical features, preferably, the shoulder angle is 30°-90°.

[0008] Based on the above technical features, preferably, the rubber stopper is made of an elastic material, which can achieve a seal with the syringe.

[0009] Based on the above technical features, preferably, the push rod is made of a rigid material that is not easily deformed.

[0010] Compared with the prior art, the beneficial effects of this application are as follows: 1. The skirt is composed of multiple skirt petals that converge inward to form a complete ring. This design effectively provides sealing performance, preventing external substances from entering the cavity, thereby ensuring a clean and sterile operating environment inside the device; the push rod head is truncated cone-shaped, and the push rod's advance and retraction are controlled through the head receiving cavity, connecting rod receiving cavity, and shoulder in the cavity. 2. When the push rod retracts from the skirt of the rubber stopper, it can be reused and matched with different syringes; this reduces the problem of occupying a large area in special situations such as inside in vitro diagnostic instruments, and also reduces waste. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the push rod structure in the piston push rod advancement and retraction device of the present invention with a microstructure; Figure 2 This is a schematic diagram of the rubber plug in the piston push rod advancement and retraction device of the present invention with a microstructure; Figure 3 This is a schematic diagram of the AA-section cross-sectional structure of the rubber plug in the piston push rod advancement and retraction device of the present invention with a microstructure. Figure 4 This is a schematic diagram of the piston push rod advancing and retracting device with a microstructure according to the present invention, which combines a rubber plug and a push rod. List of identifiers in attached diagrams: 1. Push rod; 101. Push rod head; 102. Connecting rod; 103. Rod body; 2. Rubber stopper; 3. Columnar head; 301. First columnar part; 302. Second columnar part; 303. Third columnar part; 4. Skirt edge; 401. Skirt petal; 5. Cavity; 501. Head cavity; 502. Connecting rod cavity; 503. Shoulder guard. Detailed Implementation

[0012] The following is in conjunction with the appendix Figure 1-4 The present invention will be further illustrated by the following specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0013] It should be noted that the terms "up", "down", "left", "right", "front" and "back" used in the following description refer to the directions in the attached diagram, while the terms "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0014] like Figure 1-4 As shown, a piston push rod advancing and retracting device with a microstructure includes a push rod 1 and a rubber plug 2.

[0015] The push rod 1 includes a push rod head 101, a connecting rod 102, and a rod body 103. The push rod head 101 has a frustum structure that is smaller at the front and larger at the back. Preferably, the ratio of the top diameter to the bottom diameter of the push rod head 101 is 2:5.

[0016] The diameter of the connecting rod 102 of the push rod is smaller than the diameter of the bottom surface of the push rod head and the diameter of the rod body. Preferably, the push rod is made of rigid material, and the push rod can be reused, providing sufficient stability and durability.

[0017] The rubber stopper 2 includes a cylindrical head 3 and a skirt 4. The skirt 4 is connected to the cylindrical head 3 as a whole. The skirt 4 is composed of no less than two skirt petals 4, which form a complete circle when they are gathered inward. The skirt 4 has a cavity 5 extending towards the cylindrical head 3, and the cavity 5 is used for connection with the push rod 1.

[0018] The cavity 5 includes a head receiving cavity 501 and a connecting rod receiving cavity 502. The head receiving cavity 502 closes into a frustum shape to mate with the push rod head 101, and the connecting rod receiving cavity 502 closes into a cylindrical shape to mate with the connecting rod 102. Preferably, the diameter of the connecting rod receiving cavity 502 is slightly larger than the diameter of the top plate of the push rod head 101. A shoulder 503 is formed between the head receiving cavity 501 and the connecting rod receiving cavity 502. When the shoulder 503 closes, it also forms a complete ring. When the push rod head is forcefully pushed into the cavity 5 inside the rubber stopper 2, the push rod head 101 can hook onto the shoulder, thus controlling the back-and-forth movement of the rubber stopper 2 within the syringe without it coming apart. Preferably, the included angle formed by the shoulder is 30°-90°.

[0019] The skirt petals 401 are gathered together to form a complete ring, and the push rod 1 controls the back-and-forth movement of the rubber stopper 2 inside the syringe.

[0020] Preferably, the columnar head 3 sequentially comprises a first columnar portion 301, a second columnar portion 302, and a third columnar portion 303, wherein the first columnar portion 301 and the third columnar portion 303 have the same height and diameter. Preferably, the diameter of the second columnar portion 302 is smaller than the diameter of the first columnar portion 301 or the third columnar portion 303, and preferably the diameter ratio between the two is 9:10.

[0021] Preferably, the rubber stopper 2 is made of an elastic material, which seals against the inner wall of the syringe, exhibiting good biocompatibility and durability, and is suitable for the medical field. The rubber stopper 2 is for single use, and the liquid inside the syringe must not be contaminated.

[0022] Working principle: First, the rubber stopper 2 is inserted into the syringe. The cylindrical head 3 seals the syringe, and its tail also closes, forming a complete ring shape. When the push rod head 101 is pushed forcefully into the cavity of the rubber stopper, the push rod head 101 can hook onto the shoulder 503 of the cavity, thus controlling the back-and-forth movement of the rubber stopper 2 within the syringe without it coming apart. When the push rod 1 moves the rubber stopper 2 backward to a certain extent, that is, while the cylindrical head 3 of the rubber stopper is still inside the syringe and the skirt 4 has come out of the syringe, the skirt 401 opens and no longer covers the push rod head 101. At this point, the rubber stopper 2 and the push rod 1 separate. The cylindrical head 3 of the rubber stopper remains inside the syringe to continue sealing the syringe, while the push rod 1 is freed and can then control the next similar structure, achieving a reuse effect.

[0023] In summary, the piston push rod advancement and retraction device with a miniature structure disclosed in this application achieves excellent sealing performance, precise control capability, and stable operating characteristics through reasonable structural design and material selection. It reduces the area occupied by delicate operations in a small space, realizes the reusability of the syringe push rod, and has broad application prospects in the medical field.

[0024] It should be noted that the accompanying drawings merely illustrate the technical concept of the present invention and should not be used to limit the scope of protection of the present invention. For those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and all such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A piston push rod advancing and retracting device with a miniature structure, characterized in that: Includes push rod (1) and rubber stopper (2); The push rod (1) includes a push rod head (101), a connecting rod (102) and a rod body (103). The push rod head (101) is a frustum structure with a smaller front and a larger back. The rubber stopper (2) includes a cylindrical head (3) and a skirt (4). The skirt (4) is connected to the cylindrical head (3) as a whole. The skirt (4) is composed of no less than two skirt petals (401). The skirt petals are gathered inward to form a complete circle. The skirt (4) has a cavity (5) extending towards the cylindrical head. The cavity (5) includes a head receiving cavity (501) and a connecting rod receiving cavity (502). The head receiving cavity (501) is gathered into a frustum shape to cooperate with the push rod head (101). The connecting rod receiving cavity (502) is gathered into a cylinder shape to cooperate with the connecting rod (502). A shoulder (503) is formed between the head receiving cavity and the connecting rod receiving cavity.

2. The advance and retraction device for a piston push rod with a microstructure according to claim 1, characterized in that: The diameter of the connecting rod (102) of the push rod is smaller than the bottom diameter of the push rod head (101) and the diameter of the rod body (103).

3. The advance and retraction device for a piston push rod with a microstructure according to claim 1, characterized in that: The included angle of the shoulder (503) is 30°-90°.

4. The piston push rod advancement and retraction device with a microstructure according to claim 1, characterized in that: The rubber stopper (2) is made of elastic material, and the rubber stopper (2) is sealed with the syringe.

5. The piston push rod advancement and retraction device with a microstructure according to claim 1, characterized in that: The push rod (1) is made of rigid material.

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