A low noise pneumatic air gun biopsy needle for single handed loading

Abstract

The application discloses a low-noise pneumatic air gun type biopsy needle convenient for single-hand loading, which comprises an inner needle, an outer needle, a connector, a mechanical valve, a firing mechanism, a loading mechanism, a needle cylinder, a needle cylinder shell, a first piston, a tension spring, a second piston and a compression spring. The inner needle is glued on the outer side of the front end of the needle cylinder, the outer needle is glued on one end of the connector and is sleeved on the outer side of the inner needle, and the other end of the connector is fixed with the elongated part of the second piston. The needle cylinder comprises a needle cylinder part one and a needle cylinder part two, and the needle cylinder and the needle cylinder shell are bonded into an integrated whole after being aligned. The second piston is fixedly connected with the compression spring and is located on the inner side of the front end of the needle cylinder, and the other end of the compression spring is sleeved on the protruding part on the inner side of the front end of the needle cylinder. The first piston is fixedly connected with the tension spring and is located on the inner side of the tail end of the needle cylinder, and the other end of the tension spring is bonded with the tail seat of the needle cylinder. The firing mechanism realizes button control of cutting and sampling of the outer needle. The loading mechanism realizes button control of returning and loading of the outer needle. The application reduces the dependence of surgical operation on the experience of doctors, reduces the noise generated in the surgical process, avoids the body displacement of patients due to the noise, improves the precision of tissue biopsy surgery, can realize single-hand operation and improves the convenience of surgical operation.

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