Patent ID: 7662109
Filing Date: 2010-02-16
Classification: A61B

Abstract:
1. A biopsy device, comprising: a. a needle comprising a probe tube having a sample aperture; b. a cutter tube received in the probe tube for relative axial translation across the sample aperture to sever tissue prolapsed therein, a first fluid passage defined within the cutter tube and a second fluid passage defined between an outer surface of the cutter tube and an inner surface of the probe tube, wherein the cutter tube is operable to translate axially; c. a flush control; d. a flush valve assembly responsive to the distally positioned cutter tube and to an activation of the flush control to couple a selected one of the first and second fluid passage to a liquid source, wherein the other one of the first and second fluid passage is maintained at a lower pressure to the liquid source to effect fluid through the needle; e. a vacuum assist valve assembly responsive to an at least partially retracted longitudinal position of the cutter tube to couple a selected one of the first and second fluid passage to a pneumatic source, wherein the vacuum assist valve assembly further comprises a valve body comprising a distally open cylinder body, a first port distally positioned, a second port positioned proximal to the first port, and a third port positioned between the first and second port; and f. a vacuum valve actuator having distal and proximal dynamic seals spaced to encompass the first and third ports when distally positioned and the second and third ports when proximally positioned.