Patent attributes
A marker delivery device includes a handle having a housing, and a cannula positioned in the handle that retractably extends beyond the front end of the housing. A retraction mechanism is mounted to the housing, and has a shear member. The retraction mechanism is coupled to a proximal end of the cannula. The retraction mechanism is configured to store a retraction force, and is configured to facilitate a retraction of the cannula into a chamber of the housing upon an actuation of the retraction mechanism. The shear member has a shear region of reduced cross section dimension. The shear member is configured to be displaced upon the actuation of the retraction mechanism to expose the shear region to the retraction force to shear the shear member at the shear region to enable the retraction and prevent reuse of the marker delivery device.
