Biopsy needle instrument

Details Biopsy needle instrument Biopsy needle instrument

1990-09-14

1994-11-29

Hafer, Robert A.

Surgery

Truss

Pad

128749, A61B 1000

Patent

active

053680456

ABSTRACT:
One-handed operable biopsy needle instruments, employing combined spring driven stylets, and cannulas, capable of taking multiple specimens while the other hand is free, e.g. to manipulate an ultrasound probe are described. The particular biopsy needle instrument shown in detail has a pair of cannula and stylet compression springs, a pair of members directly engaged on the ends of the springs mounting respectively the cannula and stylet, and releasable holding means for holding the springs compressed until firing. The device that loads the stylet spring and a pivotal latch each can serve as a means for releasably holding the stylet spring. A latch is employed to releasably hold the cannula spring. Actuation of the stylet can cause sequential operation of the cannula through impact of the stylet-mounting member on the cannula latch. Finger-displaceable means provided on a side surface of the housing for selective loading of the springs, and provision of finger-displaceable lock and firing button, all operable by a hand while that hand holds the device, enables single-handed loading and taking of the biopsy specimen(s). The embodiment shown employs a pair of longitudinally arranged, recessed thumb-actuated slide switches on a broad side of a rectangular cross-section housing, and lock and firing button on top, in pre-arranged relationship to the bevel of the stylet tip.

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