Negative pressure puncture needle cylinder with adjustable pressure

Abstract

The invention discloses a negative pressure puncture needle cylinder with adjustable pressure. The negative pressure puncture needle cylinder comprises a syringe needle cylinder body which is internally provided with a piston rod. A piston is arranged at the front end of the piston rod. A negative pressure control valve is arranged on a needle cylinder nozzle of the syringe needle cylinder body. A piston rod stretch and contract locking device is arranged on the syringe needle cylinder body and adjusts the magnitude of the negative pressure between the piston and the negative pressure control valve. The negative pressure control valve can be switched off before puncture, the piston rod is pulled backwards so that negative pressure can be formed in the syringe needle cylinder body, the negative pressure in the syringe needle cylinder body is adjusted through the piston rod stretch and contract locking device to meet the puncture requirements, the magnitude of the negative pressure in a needle cylinder syringe is further locked, the stability of the negative pressure in the needle cylinder syringe is kept, an operator can concentrate on positioning a focus, the influences of syringe piston pulling on negative pressure are effectively avoided, the influences of syringe shaking and distraction on positioning are effectively avoided, and the whole negative pressure puncture needle cylinder with adjustable pressure is light and attractive.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to a pressure-adjustable negative pressure puncture needle cylinder. Background technique [0002] Puncture is a diagnosis and treatment technique in which a puncture needle is inserted into the body cavity to extract secretions, tissues, and cells for laboratory tests, injecting gas or contrast agent into the body cavity for contrast examination, or injecting drugs into the body cavity. It is a commonly used clinical method for disease diagnosis or treatment method has an irreplaceable role of other methods. At present, the existing puncture needles mainly use ordinary syringes for puncture, and the operation is laborious. The operator must constantly pay attention to whether the negative pressure value of the puncture needle is up to the standard when puncturing, and cannot concentrate on locating the lesion. Abnormal conditions such as syringe shaking affect the punc...

AI Technical Summary

Problems solved by technology

At present, the existing puncture needles mainly use ordinary syringes for puncture, and the operation is laborious. The operator must constantly pay attention to whether the negative pressure value of the puncture needle is up to the standard when puncturing, and cannot concentrate on locating the lesion. Abnormal conditions such as syringe shaking affect the puncture, and the negative pressure of the conventional puncture needle is unstable, which may easily lead to unsatisfactory tissue or cell suction at the puncture site, which is difficult to meet the needs of clinical pathological smear examination, and repeated punctures are prone to inflammatory reactions and patient discomfort reaction, causing bleeding at the surgical site, local metastasis of tumor or cancer cells

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