Constant-pressure and negative-pressure injector

Abstract

The utility model discloses a constant-pressure negative-pressure injector which comprises a needle cylinder body, a push-pull rod is installed in the needle cylinder body, a piston is installed at the front end of the push-pull rod, threads are arranged at the joint of the piston and the push-pull rod, namely the joint, threads are arranged on the inner wall of the tail end of a needle cylinder outer sleeve, and the threads at the joint are matched with the threads on the inner wall of the tail end of the needle cylinder outer sleeve. When the syringe is used, the push-pull rod is pulled to the thread at the tail end of the syringe body, the push-pull rod is rotated to enable the thread at the connector to be matched with the thread at the tail end of the syringe body, and therefore the syringe is locked, the constant-pressure and negative-pressure purposes are achieved, manual fixing is not needed any more, use is convenient, and the technology is simple.

Description

Technical Field

[0001] This utility model relates to the field of medical negative pressure injector technology, specifically a constant pressure negative pressure injector. Background Technology

[0002] A syringe is a common medical device with a relatively standardized structure, including a hollow syringe body, a push-pull rod inside the syringe body, and a piston at the front end of the push-pull rod. The elastic piston is press-fitted against the inner wall of the syringe body, and a needle is attached to the front end of the syringe body. Clinically, syringes are sometimes used to draw and maintain negative pressure to assist in performing surgeries at specific locations. For example, in neurointerventional surgery, the syringe needs to be connected to a three-way valve at the designated surgical site. A negative pressure needs to be maintained continuously for a certain period of time during the procedure. Currently, this is mainly done manually, but in cases of long surgeries, manual maintenance is difficult and prone to failure.

[0003] Currently, there are some negative pressure injectors that can replace manual maintenance of negative pressure, but their structure is relatively complex and their cost is high. Utility Model Content

[0004] The technical problem this patent aims to solve is to overcome the shortcomings of existing technologies and propose a constant pressure negative pressure injector. When the negative pressure injector is in a negative pressure state, it can be fixed by its own structure without the need for manual hand-holding to maintain the negative pressure state. It is safe, reliable, simple in structure, and easy to operate.

[0005] The present invention provides a constant pressure negative pressure injector, comprising a syringe body, a push-pull rod inside the syringe body, and a piston at the front end of the push-pull rod; the connection between the push-pull rod and the piston, i.e., the joint, is widened and threaded, and a thread is provided on the inner wall of the end of the syringe body, and the thread at the joint matches the thread on the inner wall of the end of the syringe body.

[0006] Before the surgery, determine the volume of vacuum required for the procedure based on the actual situation, and then select a syringe of appropriate size. During use, first connect the front end of the syringe body to the corresponding accessory, such as a three-way valve, to seal the syringe. Then, pull the push-pull rod to the threaded end of the syringe body and rotate the push-pull rod to align the thread at the connector with the threaded end of the syringe body, thereby locking the syringe.

[0007] When the surgery is over and the liquid in the syringe body needs to be drained, simply rotate the push-pull rod to release the locking state between the connector and the end of the syringe body, and push the push-pull rod forward to drain the liquid in the syringe. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a constant pressure negative pressure injector (in its ready-to-use state).

[0009] In the diagram: 1. Syringe body; 2. Piston; 3. Connector; 4. Inner wall of the syringe outer sleeve; 5. Push-pull rod Detailed Implementation

[0010] 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.

[0011] Please see Figure 1 This utility model provides a technical solution: a constant pressure negative pressure syringe, including a syringe body (1), a push-pull rod (5) installed inside the syringe body (1), a piston (2) installed at the front end of the push-pull rod (5), a connector (3) being the connection point between the piston (2) and the push-pull rod (5), and a syringe outer sleeve tail end inner wall (4) provided at the rear end of the syringe body. The key feature is that the connector (3) is threaded, and the syringe outer sleeve tail end inner wall (4) at the rear end of the syringe body is threaded. In practical use, first connect the front end of the syringe body to a corresponding accessory such as a three-way valve to make the syringe in a sealed state, then pull the push-pull rod to the threaded end of the syringe body, and rotate the push-pull rod to make the thread at the connector match the thread at the end of the syringe body, thereby locking the syringe.

Claims

1. A constant pressure negative pressure syringe, comprising a syringe body (1), a push-pull rod (5) installed inside the syringe body (1), a piston (2) installed at the front end of the push-pull rod (5), a connector (3) being the connection point between the piston (2) and the push-pull rod (5), and an inner wall (4) at the tail end of the syringe outer sleeve provided at the rear end of the syringe body, characterized in that: The connector (3) is threaded, and the inner wall (4) of the syringe outer sleeve at the rear end of the syringe body is threaded.

2. The constant pressure negative pressure injector according to claim 1, characterized in that: The connector (3) is widened and threaded, and the inner wall (4) of the syringe outer sleeve at the rear end of the syringe body is threaded, and the two threads are matched.

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