Adjustable biopsy device capable of controlling tissue sample si

Details Adjustable biopsy device capable of controlling tissue sample si Adjustable biopsy device capable of controlling tissue sample si

1990-06-22

1992-10-20

Hindenburg, Max

Surgery

Truss

Pad

A61B 1000

Patent

active

051561603

ABSTRACT:
A tissue sampling device comprises an inner rod and an outer cannula. A primary piston is attached to a hub on the proximal end of the rod, and a secondary piston is attached to a hub on the proximal end of the cannula. The primary and secondary pistons are coupled to an actuator including a double locking mechanism and a pair of springs. The springs engage the primary and secondary pistons, and the locking mechanism holds the pistons in a cocked position. Upon triggering, the primary piston moves in response to the spring associated therewith. This moves the rod a corresponding distance causing a predetermined length of a sampling notch at the distal end of the rod to extend from the distal end of the cannula and penetrate tissue in the sample target area. Following the movement of the primary piston, the secondary piston is released from the locking mechanism, and the secondary piston moves in response to the spring acting thereon. This moves the cannula along the inner rod, and the sharpened end of the cannula severs tissue in the exposed portion of the notch of the rod and captures the severed tissue as the cannula moves over the exposed portion of the notch. The movement of the primary piston is adjustable, so that the length of the notch exposed to tissue can be controlled thereby allowing adjustable control of the amount of tissue sample that is severed and removed from the target area.

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The Bard Monopty.TM. Biopsy System (no date).

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