Self-fixing adjustable negative pressure suction device

Abstract

The utility model relates to the technical field of medical treatment, in particular to a self-fixing adjustable negative pressure suction device which comprises a needle cylinder, a piston rod and a piston. A piston is movably sealed in the needle cylinder and is connected with a piston rod; a plurality of elastic piece structures are integrally formed on the rod wall of the piston rod, and the ends of the elastic piece structures abut against the inner wall of the needle cylinder and movably abut against the edge of a port of the needle cylinder. The elastic piece structure is arranged on the piston rod, so that when the piston rod is pulled in place, the piston rod is locked on the needle cylinder for suction through the ejection of the elastic piece structure, a doctor can conveniently complete partial suction operation with one hand, the operation process is more labor-saving, the suction negative pressure can be more accurately controlled, and a better treatment effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of medical technology, specifically to a self-fixing adjustable negative pressure suction device. Background Technology

[0002] Currently, endoscopic ultrasound (EUS) has gradually become a mainstream and recommended effective method for disease diagnosis and treatment. EUS offers numerous advantages, including minimal invasiveness, short postoperative recovery time, fewer postoperative complications, and good surgical outcomes, making it more acceptable to patients. In current endoscopic ultrasound procedures, doctors typically use a syringe as a negative pressure device to aspirate tissue or tissue fluid by applying negative pressure to the syringe's inner cavity. However, the use of syringes has several limitations. Ordinary syringes used for ultrasound biopsy sampling have the following shortcomings: When using an ordinary syringe for aspiration, the doctor needs to exert force with both hands to pull the plunger to maintain a certain negative pressure. When the syringe is large, the negative pressure is high, requiring a certain amount of arm strength from the doctor; it is also difficult to accurately control the amount of negative pressure provided, as the doctor cannot accurately maintain the plunger's position manually when pulling the syringe. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a self-fixing adjustable negative pressure suction device that can effectively solve the aforementioned problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: it includes a syringe, a piston rod, and a piston; the piston is movably sealed inside the syringe, and the piston rod is connected to the piston; several spring sheet structures are integrally formed on the rod wall of the piston rod, and the ends of the spring sheet structures are in contact with the inner wall of the syringe and are movably abutted against the edge of the syringe port.

[0005] Preferably, several of the spring-loaded structures are staggered vertically on the piston rod wall.

[0006] Preferably, the ends of the spring structure are bent outwards.

[0007] Preferably, a two-way valve is connected to the outlet end of the syringe.

[0008] Preferably, the two-way valve is internally screwed with a two-way stopcock.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a self-fixing adjustable negative pressure suction device. By setting a spring structure on the piston rod, the piston rod can be locked on the syringe for suction when it is pulled to the position. This not only makes it easier for doctors to complete part of the suction operation with one hand, making the operation less strenuous, but also allows for more accurate control of the suction negative pressure, achieving better treatment results. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] Figure 2 This is the front view of this utility model.

[0012] Figure 3 yes Figure 2 Sectional view along the AA direction.

[0013] Figure 4 This is a schematic diagram of the piston rod in the embodiment.

[0014] Figure 5 This is a schematic diagram of the overall structure of the embodiment.

[0015] Explanation of reference numerals in the attached figures:

[0016] Syringe 1, piston rod 2, piston 3, two-way valve 4, two-way stopcock 5, spring-loaded structure 6. Detailed Implementation

[0017] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] like Figures 1-3 As shown, this specific embodiment adopts the following technical solution: It includes a syringe 1, a piston rod 2, and a piston 3; a two-way valve 4 is connected to the outlet end of the syringe 1, and a two-way stopcock 5 is screwed into the two-way valve 4. By rotating the two-way stopcock 5, a sealed cavity is formed inside the syringe 1; the piston 3 is movably sealed inside the syringe 1, and the piston 3 achieves sealing of the inner wall of the syringe 1; the piston rod 2 is connected to the piston 3, and the piston rod 2 drives the piston 3 to rotate, so that a negative pressure state is formed inside the syringe 1; the piston rod 2 has an integrally formed wall on its rod wall. The piston rod 2 has three spring-loaded structures 6, which are symmetrically arranged with one on the left and two on the right and staggered vertically. The ends of the spring-loaded structures 6 are bent outward. When the piston rod 2 is placed inside the syringe 1, the ends of the spring-loaded structures 6 abut against the inner wall of the syringe 1. When the piston rod 2 is pulled out of the syringe 1, the spring-loaded structures 6 pop out, and their bent ends abut against the edge of the syringe 1 port, thereby positioning the piston rod 2 on the syringe 1. The negative pressure value can be adjusted and fixed through the spring-loaded structures 6.

[0019] The syringe 1 can be made of thermoplastic polymer materials such as PP, PC or PE, or it can be made of glass or metal.

[0020] The syringe 1 has a specification ranging from 1ml to 1000ml, and the cross-section perpendicular to the push-pull direction can be set to a cross shape, polygon, circle, or ellipse, etc.

[0021] The cross section of the piston rod 2 perpendicular to the push-pull direction can be set as a cross shape, polygon, circle or ellipse, etc.

[0022] When using this invention, rotating the two-way stopcock 5 creates a sealed cavity inside the syringe 1. When negative pressure needs to be established, the piston rod 2 is pulled outward to the desired position. The spring plate structure 6 on the piston rod 2 pops out, and its end abuts against the edge of the syringe 1 port, thus fixing the position.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a self-fixing adjustable negative pressure suction device. By setting a spring structure on the piston rod, the piston rod can be locked on the syringe by the pop-out of the spring structure when it is pulled into place. This not only makes it easier for doctors to complete part of the suction operation with one hand, making the operation process less strenuous, but also allows for more accurate control of the suction negative pressure, achieving better treatment results.

[0024] Example: See Figure 4 and Figure 5 As shown, in this embodiment, the cross-section of the piston rod perpendicular to the push-pull direction is a circular structure, and the spring sheet structure 6 is an arc-shaped structure, which is integrally formed in the notch on the piston rod 2 wall.

[0025] For those skilled in the art, modifications can be made to the technical solutions described in the foregoing embodiments, and equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A self-fixing adjustable negative pressure suction device, comprising a syringe (1), a piston rod (2), and a piston (3); the syringe (1) is movably and sealed with a piston (3), and the piston rod (2) is connected to the piston (3); characterized in that: The piston rod (2) has several spring sheet structures (6) integrally formed on its rod wall. The ends of the spring sheet structures (6) are set to abut against the inner wall of the syringe (1) and are movably abut against the edge of the syringe (1) port.

2. A self-securing adjustable negative pressure suction device according to claim 1, characterized in that: Several of the aforementioned spring-loaded structures (6) are staggered vertically on the rod wall of the piston rod (2).

3. A self-retaining adjustable negative pressure suction device according to claim 2, wherein: The end of the spring sheet structure (6) is bent outward.

4. A self-retaining adjustable negative pressure suction device according to claim 1, wherein: The syringe (1) is connected to a two-way valve (4) at its outlet end.

5. A self-retaining adjustable negative pressure suction device according to claim 4, wherein: The two-way valve (4) is screwed into a two-way stopcock (5).

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