Biopsy cannula adjustable depth stop

A device for use with a biopsy device, the device comprising:

• (a) a cannula having a non-circular cross-section;
• (b) a locking member adapted to slidably and rotatably couple to the cannula and defining a shaft aperture sized to receive and at least partially circumferentially encompass the cannula, wherein the shaft aperture defines an axis of insertion and a plane, wherein the plane extends in a perpendicular direction relative to the axis of insertion;
• and
• (c) one or more ribs extending inwardly within the shaft aperture along the plane defined by the shaft aperture, wherein the one or more ribs are configured to bind against the cannula upon relative rotation between the cannula and the locking member to a locking position,
• wherein the locking member is configured to restrict the depth of insertion of the cannula through the locking member when the one or more ribs of the locking member are bound against the cannula in the locking position.

A device for use with a biopsy cannula, wherein at least a portion of the biopsy cannula defines a non-circular cross-section, the device comprising:

• (a) a plate including a plurality of apertures;
• (b) a guiding portion defining a shaft aperture sized to receive and at least partially circumferentially encompass the biopsy cannula and sized and configured to non-rotatably be received in one of the plurality of apertures of the plate;
• and
• (c) a locking member adapted to slidably and rotatably couple to the biopsy cannula and defining an elongate through hole configured to receive the biopsy cannula, wherein the locking member defines a plane, wherein the locking member includes one or more ribs extending inwardly within the through hole, wherein the one or more ribs extend along respective paths that are parallel to the plane, wherein the one or more ribs are configured to bind against the biopsy cannula upon rotation of the locking member to a locking position;
• wherein the locking member and guiding portion are configured to restrict the depth of insertion of the biopsy cannula through the guiding portion when the one or more ribs of the locking members are bound against the biopsy cannula in the locking position.