COAXIAL INCISIONAL FULL-CORE BIOPSY NEEDLE

摘要

Among other things, there are disclosed embodiments of full-core biopsy needles having an outer needle component and a middle cannula through a lumen in the outer component, through which a mandrel may be placed. The outer component includes an internal boss that reduces its internal diameter, and the cannula includes fingers that extend distally. When the needle is inserted for biopsy, tissue enters the outer component and cannula. Moving the cannula forward causes the fingers to engage a surface of the internal boss, resulting in the fingers curving into the tissue. The fingers pinch the tissue while reducing or eliminating compression of the sample to provide an easier removal of the tissue from adjacent tissue, as well as providing a block or backstop keeping the tissue within the needle. Gaps are provided between the fingers to further reduce damage to the tissue sample.

主权项

1. A full-core biopsy needle, comprising:
an outer tubular component having a body portion, a tip portion and a lumen through said body and tip portions, said tip portion having a conical tapered outer surface extending entirely around the longitudinal axis of the component, said component having a portion joining said body portion and said tip portion that is rounded externally and forms a boss within said lumen, said lumen having a first diameter proximal of said boss and a second smaller diameter distal of said boss, said lumen with said second smaller diameter extending through said tip; and a middle cannula having a body portion and a tip portion, said tip portion having a plurality of fingers, at least a first and second of said fingers being separated by a gap, said middle cannula being within said lumen of said component, wherein said component and said cannula have a first relative position with said fingers proximal of said boss, and said cannula adapted to be moved distally with respect to said component into a second relative position, said second relative position being the limit of possible distal movement of said cannula with respect to said component and being a position in which at least said first and second fingers are deflected inward by said boss, wherein in said second relative position at least a portion of said first and second fingers point toward each other but do not close the entirety of said gap.