BIOPSY CANNULA ADJUSTABLE DEPTH STOP

摘要

A biopsy system with a grid plate used as either a lateral or medial compression plate of a localization fixture used with a breast coil includes a rotatable guide cube that may be inserted into a desired rectangular recess in the grid plate after rotating to position a selected guide hole in the desired spatial orientation. Versions of a guide cube include those rotatable in two axes to provide additional hole positions, angled holes, enlarged circular holes that function with a rotating guide to support a noncircular biopsy instrument cannula (e.g., trocar/sleeve combination, core biopsy probe of a biopsy device) for rotation. A rotating guide may have an unlocked state for easily sliding to a selected longitudinal position thereon. Thereafter, the rotating guide is locked to serve as a positive depth stop (e.g., quarter turn locking elastomeric rings, triangular and scissor clips, and shutter depth stops).

主权项

1. A device for use with a biopsy cannula, the device comprising:
a guiding portion defining a shaft aperture sized to receive and at least partially circumferentially encompass the biopsy cannula; a locking member defining an elongate through hole configured to receive the biopsy cannula, wherein the locking member comprises one or more resilient ribs extending inwardly within the through hole, wherein the one or more resilient ribs are configured to bind against the biopsy cannula upon relative rotation between the biopsy cannula and 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 resilient ribs of the locking members are bound against the biopsy cannula in a locking position.