| 摘要 |
A biopsy device comprises a cannula having a transverse tissue receiving aperture and a cutter that is movable relative to the cannula to sever tissue protruding through the aperture. A first valve assembly comprises a first valve body and a first actuator. The first valve body has a first port, a second port, and a third port. The first port is in fluid communication with either atmospheric air or a pressurized medium. The second port is in fluid communication with the cannula. The third port is in fluid communication with a vacuum source. The first actuator is translatable relative to the first valve body to selectively couple either the first port or the third port with the second port. An optional second valve assembly is operable to selectively couple the cannula with either a source of saline or the first valve assembly.
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