Patent ID: 8597203

Claim:
A biopsy device, comprising: a housing; a coring cannula having a distal end, a proximal end, an internal bore, and a longitudinal axis and being centered on the axis and coupled to the housing, the coring cannula having an inner surface forming a cannula bore, the cannula inner bore having an inner diameter, the coring cannula rotatable about the axis; a cutting ring having an inner surface forming a cutting ring bore and being located at the distal end of the coring cannula, the cutting ring having an interior bore with an interior diameter, the cutting ring having a distal end forming a coring cannula cutting edge; and, a tapered wall coupled between the coring cannula and the cutting ring, the tapered wall providing a ramped surface between the inner surface of the cutting ring and the inner surface of the cutting cannula, the tapered wall being located near the distal end of the coring cannula and having a first end and a second end, the second end of the tapered wall being located away from the first end of the tapered wall in a direction towards the proximal end of the coring cannula, the first end of the tapered wall having a diameter which is larger than a diameter of the second end of the tapered end.