Marker delivery device for tissue marker placement

• US 10,258,428 B2
• Filed: 03/10/2014
• Issued: 04/16/2019
• Est. Priority Date: 12/30/2008
• Status: Active Grant

• Current Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Original Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Inventors: Ranpura, Himanshu, Van Liere, Chad C.
• Primary Examiner(s): Park, Patricia J
• Application Number:
  US14/202,842
• Publication Number:
  US 20140194892A1
• Time in Patent Office: 1,863 Days
• Field of Search: None
• CPC Class Codes: A61B 2090/3987 Applicators for implanting markers
• CPC Class Codes: A61B 90/39 Markers, e.g. radio-opaque or breast lesions markers

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

1. A marker delivery device configured for deploying a tissue marker, comprising:

a handle including a housing having a front end, a back end, a side wall, a chamber located between the front end and the back end that is surrounded by the side wall, a first hole leading from the chamber to the exterior of the handle through the front end of the housing, and a second hole leading from the chamber to the exterior of the handle through the side wall of the housing;

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 first 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 retraction trigger accessible at the exterior of the housing, the retraction trigger configured to be depressed by an exterior force in an axial direction toward the chamber of the housing of the handle;

a shear member having a longitudinal length that is axially oriented relative to the housing of the handle, the longitudinal length having an exterior end and an interior end, the shear member having a shear region of reduced cross section dimension, and the shear region of reduced cross section being located between the exterior end and the interior end; and

a cannula guide block attached to the proximal end of the cannula, the retraction force configured to be applied to the cannula guide block, the cannula guide block configured to be slidably disposed in the chamber of the housing, the retraction trigger configured to be linked to the cannula guide block by the shear member via the retraction trigger being coupled to the exterior end of the longitudinal length of the shear member and the cannula guide block being coupled to the interior end of the longitudinal length of the shear member, the retraction mechanism is configured to be in a ready position when the shear region of reduced cross section dimension of the shear member is supported by the side wall by being in alignment with the second hole of the housing of the handle;

upon actuation of the retraction trigger, the shear region of reduced cross section dimension is configured to move out of alignment with the second hole and the shear member is configured to be sheared at the shear region of reduced cross section dimension by release of the retraction force upon the cannula guide block which transfers the retraction force to the interior end of the longitudinal length of the shear member to permanently disconnect the retraction trigger from the cannula guide block.

2. The marker delivery device of claim 1, wherein each of the exterior end and the interior end of the longitudinal length of the shear member has the same cross sectional dimension.

3. The marker delivery device of claim 1, wherein the shear region of reduced cross section dimension is an annular groove.