Patent ID: 9101347
Filing Date: 2015-08-11
Classification: A61B

Abstract:
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 component having a portion connecting said body portion and said tip portion, said connecting portion joining an outer wall of said body portion with a rounded portion that turns inward from the outer wall to form an external rounded corner and an internal proximal-facing surface, the rounded portion having a cross-section in a plane including the longitudinal axis of an arc of a circle, said rounded portion joining said tip portion at an end opposite the position where the rounded portion joins the body portion, said tip portion extending entirely around the longitudinal axis having an external diameter that decreases uniformly from the join with the rounded portion to a distal edge, said tip portion having a constant inner diameter between the proximal-facing surface of the rounded portion and the distal edge, the constant inner diameter of the tip portion being less than a constant inner diameter of the body portion, so that said lumen has a first diameter proximal of said proximal-facing surface and a second smaller uniform inner diameter extending distally from said proximal-facing surface, said lumen with said second smaller uniform diameter extending through said tip; 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 proximal-facing surface, 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 toward the longitudinal axis but not into the constant inner diameter of the tip portion by said proximal-facing surface, 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.