Tissue splitting biopsy needle

摘要

Tissue splitting biopsy devices and methods use a needle portion and a sheath portion that are configured such as to allow simultaneous sectioning of a tissue to produce two tissue samples with corresponding surfaces using motion of the needle portion relative to the sheath portion. Most preferably, the needle portion has a chisel blade tip and at least two cavities opposite to each other and at the same distance from the tip, while the sheath portion has a sharpened front edge.

主权项

1. A method of performing a biopsy with a biopsy device, the biopsy device comprising a needle portion having an incising proximal end and first and second cavities, wherein the incising proximal end has a closed incising tip forming a blade surface shaped to form a cutting plane through the tissue, and the biopsy device further comprising sheath portion having a sharpened front edge, wherein the sheath portion at least partially surrounds the needle portion, the method comprising the steps of:
advancing the needle portion into a tissue to produce simultaneously first and second tissue portions with first and second surfaces facing with each other along a plane of sectioning; further advancing the needle portion such that the first and second cavities receive the first and second tissue portion, wherein the first and second surfaces face respective bases of the first and second cavities; advancing the sheath portion relative to the needle portion such that the first and second tissue portions are cut from the tissue by the sharpened front edge while the first and second tissue surfaces are retained in the first cavity and second cavity; and wherein the bases of the first and second cavities are in respective planes that are equidistant and substantially parallel to the cutting plane to allow removal of a plurality of biopsy cores with corresponding tissue surfaces from the same area of interest without compression or distortion of the surfaces.