Full core biopsy device

摘要

A biopsy device includes coaxially disposed inner and outer needles in which the outer needle tip is configured for obtaining a tissue sample. The inner surface of the outer needle includes a tissue retention feature which may include a countersink and/or a feature formed in the inner surface. The device may be configured such that the inner needle does not extend past a certain point within the outer needle.

主权项

1. A biopsy device comprising:
an outer needle hub; an outer needle coupled at a proximal end to the outer needle hub, the outer needle including:
an outer needle tip at an opposite distal end;a tissue slicing feature defined at said tip configured for slicing tissue; andan inner surface including a countersink formed at said tip and tapered from a distalmost end of the outer needle; an inner needle hub; and an inner needle coupled at a proximal end to said inner needle hub, the inner needle including an inner needle tip at an opposite distal end, said inner needle coaxially disposed within said outer needle, wherein; said tissue slicing feature includes a plurality of prongs and valleys between said prongs, said prongs and valleys defining a cutting edge for slicing tissue, said valleys defining a diameter; and said countersink is tapered from said outer needle tip to an inner end located at a distance from said outer needle tip equal to twice said diameter.