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

Claim 20:
21. A biopsy instrument comprising:
an axially extending core collector that has a convex underside and an upper surface;
wherein said core collector comprises two axially extending rows of teeth formed at lateral sides of the core collector and forming a cradle portion between them, with the teeth of each row axially spaced from each other; and
a tubular cannula having an inside wall and a sharp distal end;
wherein the cannula is configured to receive therein the core collector for relative linear motion between (i) a first relative position in which a selected length of the core collector extends distally from the cannula and (ii) a second position in which the cannula has moved distally over and relative to the core collector from said first position;
wherein in an axial view from a distal toward a proximal end of the cradle portion of the core collector, the cradle portion extends over an arc angle sufficient to keep the core collector radially centered in the cannula due to the lateral sides of the cradle portion bearing against the inside wall of the cannula to thereby keep the convex underside of the core collector from moving away from the cannula inside due to forces acting on the core collector in a direction transverse to the axial length of the core collector both during said motion from the first to the second positions and during said motion from the second to the first positions.