Patent ID: 8597205

Claim:
A method of extracting a tissue sample from a biopsy device comprising: providing a cannula fluidly connected to a chamber, the chamber having a body having a distal end, a proximal end; at least one first recessed area extending along an inner wall of the body, proximate the proximal end of the body of the chamber, wherein the at least one first recessed area is configured to release positive pressure generated within the chamber; at least one second recessed area extending along the inner wall of the body, proximate the distal end of the body of the chamber, wherein the at least one second recessed area is configured to release negative pressure generated within the chamber; inserting the cannula into a patient's body; generating a negative pressure environment in the chamber relative to an atmospheric pressure surrounding the chamber; removing the tissue sample from the patient's body through a suction resulting from the negative pressure environment, wherein the tissue sample is received into the cannula; removing the cannula from the patient's body; generating a positive pressure environment in the chamber relative to an atmospheric pressure surrounding the chamber; releasing the positive pressure environment through the first recessed area on the chamber; and removing the tissue sample from the cannula.