| 摘要 |
An aspiration biopsy device in the form of a modified syringe having a pair of valves therein and a holding structure to hold the piston of the syringe in a desired vacuum creating location. In a first embodiment there is a stop cock type open-shut valve between the needle and the syringe body, a hole in the side of the syringe barrel intermediate the ends thereof and a spring, which when the stop cock is closed, biases the piston to a vacuum creating position with the piston head located between the hole and the needle. In a second embodiment, instead of the hole in the side of the barrel being intermediate the ends thereof, the hole is located near the needle mounting end of the barrel and an open-shut valve controls the opening and closing of such hole. In a third embodiment of this invention, instead of the spring of the first two embodiments, a physical stop arrangement is carried by the piston and the barrel to hold the piston in its vacuum creating position.
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