Patent ID: 8858463

Claim:
A biopsy device comprising: a chamber having a body having a proximal end, a distal end, and an inner wall, wherein the proximal end includes an inlet; a cannula coupled to the inlet, the cannula configured to take a tissue sample from a patient; a piston configured to engage the inner wall of the chamber; a first recessed area extending along the inner wall of the body, distal to the proximal end of the body of the chamber, wherein the first recessed area is configured to release positive pressure within the chamber, wherein the first recessed area is configured to be longitudinal, diagonal, latitudinal, or circular; and a second recessed area extending along the inner wall of the body, the second recessed area being separated distally from the first recessed area, the second recessed area being proximal to the distal end of the body of the chamber, wherein the second recessed area is configured to release negative pressure within the chamber, wherein the second recessed area is configured to be longitudinal, diagonal, latitudinal, or circular.