Patent ID: 7871384
Filing Date: 2011-01-18
Classification: A61B

Abstract:
1. A method of controlling a biopsy device, the method comprising the steps of: positioning a tissue receiving aperture within tissue; advancing a cutter to sever tissue received in the aperture by operating a motor to provide translation of the cutter in a distal direction from a position proximal of the tissue aperture to a position distal of the tissue receiving aperture; retracting the cutter by operating the motor to provide translation of the cutter in a proximal direction from the position distal of the tissue receiving aperture to the position proximal of the tissue receiving aperture; providing a current profile for the motor providing translation of the cutter, wherein the step of providing a current profile for the motor comprises providing a current profile for both advancing the cutter and retracting the cutter, wherein the current profile for advancing the cutter is different from the current profile for retracting the cutter; measuring the current of the motor; determining the difference between the measured current of the motor and the current profile; and adjusting the current to the motor if the difference between the measured current and the current profile is greater than a predetermined amount; and wherein the step of adjusting the current is operative to change the rate of translation of the cutter.