# US 2014/0194892 A1 · Marker delivery device for tissue marker placement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0194892 A1 - Document ID: US20140194892A1 - Status: Published application - Kind: A1 - Application number: 14/202,842 - Filed: 2014-03-10 - Published: 2014-07-10 - Earliest claimed: 2009-10-07 - Assignees: C. R. Bard, Inc. - Applicants: C. R. Bard, Inc. - Inventors: Himanshu Ranpura; Chad C. Van Liere - Web page: https://patentgrep.com/patent/US20140194892A1 ## CPC - A61B 90/39: {Markers, e.g. radio-opaque or breast lesions markers} - A61B 2090/3987: {Applicators for implanting markers} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A marker delivery device is configured for deploying a tissue marker. The marker delivery device includes a handle having a chamber, and a cannula. According to one aspect, the cannula has a flexible portion formed by a slot arrangement having of a plurality of spaced-apart substantially parallel peripheral slots extending through the side wall of the cannula to the lumen. A marker introducer rod is movably disposed in the lumen of the cannula for deploying the mark, and has a flexible region that corresponds to the flexible portion of the cannula. According to another aspect, a retraction mechanism is mounted to the handle and is configured to facilitate a complete retraction of both the cannula and the marker introducer rod into the chamber of the housing of the handle upon an actuation of the retraction mechanism. ## Claims ### Claim at position 1 1-23. (canceled) ### Claim 24 A marker delivery device configured for deploying a tissue marker, comprising: a handle including a housing having a front end and a back end, with a chamber located between the front end and the back end, and having a hole leading from the chamber to the exterior of the handle; a cannula having a proximal end, a distal end, and a lumen, the cannula being positioned in the handle such that the cannula retractably extends through the hole beyond the front end of the housing; and a retraction mechanism mounted to the housing, the retraction mechanism being coupled to the proximal end of the cannula, the retraction mechanism being configured to store a retraction force, and configured to facilitate a retraction of the cannula into the chamber of the housing of the handle upon an actuation of the retraction mechanism, the retraction mechanism including a shear member having a shear region of reduced cross section dimension, the shear member configured to be displaced by a user to expose the shear region to the retraction force to shear the shear member at the shear region to enable the retraction. ### Claim at position 3 25-45. (canceled) ### Claim 46 (depends on 24) The marker delivery device of claim 24, wherein the retraction mechanism includes: a retraction trigger accessible at the exterior of the housing, the retraction trigger configured to displace the shear member and release the retraction force; and a cannula guide block attached to the proximal end of the cannula, the retraction force being applied to the cannula guide block, the cannula guide block being slidably disposed in the chamber of the housing, the retraction trigger being linked to the cannula guide block by the shear member to hold the cannula guide block stationary relative to the housing of the handle prior to actuation of the retraction trigger, and the retraction mechanism configured such that when the retraction trigger is actuated, the shear member is sheared at the shear region to permanently disconnect the retraction trigger from the cannula guide block. ### Claim 47 (depends on 46) The marker delivery device of claim 46, the retraction mechanism including a spring located between the front end of the housing and the cannula guide block, the spring being in a compressed state prior to actuation of the retraction trigger to provide a preload of the retraction force on the cannula guide block, and configured to decompress to effect the retraction of the cannula guide block within the housing to shear the shear member at the shear region when the retraction trigger is actuated. ### Claim 48 (depends on 24) The marker delivery device of claim 24, further comprising: a marker introducer rod disposed coaxially with the cannula, and configured to deploy the tissue marker from the distal end of the cannula, the marker introducer rod having an actuation end and a marker deployment end; a deployment mechanism mounted to the housing, the deployment mechanism being coupled to the actuation end of the marker introducer rod, the deployment mechanism being configured to displace the marker introducer rod for deploying the tissue marker upon an actuation of the deployment mechanism; and the retraction mechanism configured to facilitate a complete retraction of both the cannula and the marker introducer rod into the chamber of the housing of the handle upon an actuation of the retraction mechanism. ### Claim 49 A marker delivery device configured for deploying a tissue marker, comprising: a handle including a housing having a front end and a back end, with a chamber located between the front end and the back end, and having a hole leading from the chamber to the exterior of the handle; a cannula having a proximal end, a distal end, and a lumen, the cannula being positioned in the handle such that the cannula retractably extends through the hole beyond the front end of the housing; a marker introducer rod coaxial with the cannula, the marker introducer rod having an actuation end; a first shear member having a first region of reduced cross section dimension; a second shear member having a second region of reduced cross section dimension; a deployment mechanism mounted to the housing, the deployment mechanism including: a marker deployment trigger accessible at an exterior of the housing; and an introducer rod guide block attached to the actuation end of the marker introducer rod, the introducer rod guide block being slidably disposed in the chamber of the housing, the introducer rod guide block being linked to the marker deployment trigger by the first shear member; and a retraction mechanism mounted to the housing, the retraction mechanism being configured to store a retraction force, and configured to facilitate a retraction of both the cannula and the marker introducer rod into the chamber of the housing of the handle upon an actuation of the retraction mechanism, the retraction mechanism including: a retraction trigger accessible at the exterior of the housing; and a cannula guide block attached to the proximal end of the cannula, the retraction force being applied to the cannula guide block, the cannula guide block being slidably disposed in the chamber of the housing, the retraction trigger being linked to the cannula guide block by the second shear member. ### Claim 50 (depends on 49) The marker delivery device of claim 49, configured such that upon actuation of the retraction trigger, the second shear member is sheared at the second region of reduced cross section dimension by a retraction of the cannula guide block to permanently disconnect the retraction trigger from the cannula guide block, and configured such that the first shear member is sheared at the first region of reduced cross section dimension when the cannula guide block impacts the introducer guide rod block during retraction of the cannula guide block, and when the first shear member is sheared the marker deployment trigger is permanently disconnected from the introducer guide rod block. ### Claim 51 (depends on 49) The marker delivery device of claim 49, the retraction mechanism including a spring located between the front end of the housing and the cannula guide block to store the retraction force, the spring being in a compressed state prior to actuation of the retraction trigger to provide a preload of the retraction force on the cannula guide block, and configured to decompress to initiate the retraction of the cannula guide block within the housing to shear the second shear member at the second region of reduced cross section dimension when the retraction trigger is actuated. ### Claim 52 (depends on 49) The marker delivery device of claim 49, wherein: the housing includes a trigger slot that extends through a side wall of the housing, the marker deployment trigger being mounted to the housing for sliding movement along the trigger slot from an initial position to a marker deployed position, the marker deployment trigger includes a first lock member and the housing includes a second lock member, and the first lock member permanently engages the second lock member when the marker deployment trigger is positioned in the marker deployed position. ### Claim 53 (depends on 49) The marker delivery device of claim 49, wherein: the cannula has a flexible portion formed by a slot arrangement having of a plurality of peripheral slots extending through a side wall of the cannula to the lumen, the plurality of peripheral slots being spaced apart to be substantially parallel along the lengthwise extent of the cannula to facilitate a flexure at the flexible portion of the cannula; and the marker introducer rod has a flexible region that corresponds to the flexible portion of the cannula. ### Claim 54 A method of operating a marker delivery device having a handle with a housing, a cannula, and a marker introducer rod, the marker delivery device configured for deploying a tissue marker, the method comprising: operating a retraction mechanism to effect a retraction of the cannula into a chamber of a housing of the handle; and displacing a shear member to expose a shear region of the shear member to a retraction force exerted by the retraction mechanism to shear the shear member at the shear region to enable the retraction. ### Claim 55 (depends on 54) The method of claim 54, wherein the retraction mechanism comprises a retraction trigger accessible at the exterior of the housing and a cannula guide block attached to the proximal end of the cannula, the retraction force being applied to the cannula guide block, the cannula guide block being slidably disposed in the chamber of the housing, the retraction trigger being linked to the cannula guide block by the shear member to hold the cannula guide block stationary relative to the housing of the handle, the method comprising: actuating the retraction trigger to release the retraction force to retract the cannula guide block; and shearing the shear member at the shear region during the retraction of the cannula guide block to permanently disconnect the retraction trigger from the cannula guide block. ### Claim 56 (depends on 55) The method of claim 55, wherein the retraction mechanism comprises a spring located between the front end of the housing and the cannula guide block, the spring being in a compressed state prior to actuation of the retraction trigger to provide a preload of the retraction force on the cannula guide block, and configured to decompress to initiate the retraction of the cannula guide block within the housing to shear the shear member at the shear region when the retraction trigger is actuated. ### Claim 57 (depends on 54) The method of claim 54, comprising: actuating the retraction mechanism for retracting both the cannula and the marker introducer rod into the chamber of the housing of the handle; and preventing a reversal of the retracting by the shearing of the shear member.