Biopsy apparatus and method
A biopsy device and method are provided for obtaining a tissue sample, such as breast tissue biopsy sample. The device includes an outer cannula having a cutter lumen and a side tissue port communicating with the cutter lumen. The device can be operated to push severed tissue samples through the cutter with a fluid, such as saline, without exposing the tissue surrounding the cannula to the fluid.
1. A method of providing a biopsy sample comprising:
providing an outer cannula having a cutter lumen, a side tissue port communicating with the cutter lumen, and a fluid passageway distal of the side tissue port and spaced circumferentially from the side tissue port;
providing a hollow cutter disposed for translation within the cutter lumen;
providing a second lumen, wherein the second lumen is parallel to the cutter lumen, wherein the second lumen is in fluid communication with the cutter lumen via the fluid passageway;
drawing tissue into the side tissue port, wherein the act of drawing tissue comprises:
(i) inducing a vacuum in the cutter lumen, and
(ii) inducing a vacuum in the second lumen;
translating a distal end of the cutter past the side tissue port to sever a tissue sample;
directing a fluid through the fluid passageway to push the severed tissue sample through the cutter.
2. The method of claim 1 wherein the step of directing a fluid through the fluid passageway is performed while the distal end of the cutter is disposed distal of the side tissue port.
3. The method of claim 1 wherein the fluid passageway is spaced at least 90 degrees circumferentially from the side tissue port.
4. The method of claim 1 wherein the fluid passageway is disposed circumferentially opposite the side tissue port.
5. The method of claim 1 wherein the step of directing a fluid through the fluid passageway is performed with the inner cutter disposed concentrically within the cutter lumen.
6. The method of claim 1 wherein the step of directing a fluid is performed without directing fluid past the side tissue port.
7. The method of claim 1 wherein the step of directing a fluid comprises directing a liquid.
8. The method of claim 1 wherein the act of pushing the severed tissue sample and the act of inducing a vacuum within the hollow cutter are performed substantially simultaneously.