Biopsy needle with completely closable cutting end bore

Details Biopsy needle with completely closable cutting end bore Biopsy needle with completely closable cutting end bore

1989-04-24

1990-05-22

Hindenburg, Max

Surgery

Truss

Pad

606184, 606185, A61B 1000

Patent

active

049268775

ABSTRACT:
A hollow tubular needle body open at a distal end, tapers inwardly to define a distal end opening of reduced cross-section relative to the balance of the biopsy needle hollow tubular body bore. The distal end of the hollow tubular needle body is provided with an axially oblique sharp cutting edge terminating in a pointed tip to facilitate skin penetration. A hollow tubular needle body is of racetrack cross-section, formed by opposed parallel straight walls joined at opposite ends to respective arcuate walls. Laterally projecting ribs provided within the hollow tubular needle body at the juncture between one arcuate wall and the opposed, parallel straight walls support a thin flexible strip formed guillotine cutting blade, having a lateral width less than the distance between the opposed parallel straight body walls facing the one arcuate wall for longitudinal sliding movement toward and away from the needle body distal end. The blade width is in excess of the width of the distal end opening, and the blade terminates in a transverse arcuate leading edge conforming to the arcuate shape of the hollow tubular needle body distal end arcuate wall with which it contacts, to insure sealing of the blade as it traverses across the distal end opening parallel to the oblique distal end cutting edge and to effect complete severence of tissue within the bore. The racetrack configuration of the needle body permits orientation of the needle while insuring severence of a full section of biopsy tissue at the very tip of the needle.

REFERENCES:
patent: 3007471 (1961-11-01), McClure, Jr.
patent: 4651752 (1987-03-01), Fuerst
patent: 4785826 (1988-11-01), Ward

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