Needle aspiration biopsy device with enclosed fluid supply

摘要

A needle aspiration biopsy device in the form of an external guide catheter having a distal end closed with a rapidly opening and closing valve. A syringe is disposed proximally of the guide catheter and has connected thereto a needle catheter which is telescopically received within the guide catheter. The needle catheter is made of an elongated tube mounting a needle at its distal end. A proximal seal seals the proximal end of the guide catheter and sealingly receives the needle catheter. The needle catheter extends to the distal end of the guide catheter and has a withdrawn position wherein the needle end thereof lies proximally of the valve in the distal end of the guide catheter and an extended position wherein the needle end thereof projects through and distally outwardly of the valve. A source of fluid is connected to the bore within the guide catheter at a location between the proximal seal and the distal valve. In a first embodiment the valve is made of a closed cell elastic plastic and the needle is of the non-coring type. In the second embodiment, the valve is of the normally closed flapper valve type.