Patent ID: 11903569
Assignee: URO-1, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 11:
12. A biopsy instrument comprising:
an axially extending tubular cannula that has an inside wall and a sharp distal end;
an axially extending core collector that has a sharp distal tip and a proximal portion extending proximally from the sharp tip and configured to fit in the cannula for linear relative motion between the cannula and the core collector;
wherein said proximal portion of the core collector has a convex bottom and an upper surface with lateral teeth along at least a portion of the axial length of the core collector, forming a cradle portion that in an axial view from a distal toward a proximal end thereof extends over a sufficiently large arc angle to keep said proximal portion of the core collector radially centered in said cannula and said convex bottom against the inside wall of the cannula by said lateral teeth bearing against said inside wall of the cannula, thereby providing an open space for a tissue sample;
wherein said lateral teeth comprise two laterally spaced rows of teeth and wherein the teeth of each row are axially spaced from each other; and
wherein said relative motion between the cannula and the core collector comprises motion along said axis between (i) a first relative position in which said proximal portion of the core collector protrudes distally from the cannula for a tissue sample to enter therein and (ii) a second relative position in which said cannula has moved distally relative to said core collector to thereby sever said tissue sample from surrounding tissue and said proximal portion of the core collector with the core sample therein is inside said cannula.