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Marking device with retractable cannula

  • US 10,342,635 B2
  • Filed: 02/26/2015
  • Issued: 07/09/2019
  • Est. Priority Date: 04/20/2005
  • Status: Active Grant
First Claim
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1. A marking device comprising:

  • a handle having a closed handle proximal end and a handle distal end and defining a hollow interior;

    a delivery assembly slidably mounted to the handle comprising;

    a cannula having an open cannula distal end, operable from a retracted cannula position and an extended cannula position wherein the extended cannula position is characterized by the cannula distal end extended beyond the handle distal end and the retracted cannula position is characterized by the cannula distal end retracted within the hollow interior;

    a stylet assembly slidably mounted to the handle having;

    a stylet with a stylet distal end and a stylet proximal end; and

    a stylet support shaft, wherein the stylet proximal end is fixed within the stylet support shaft;

    the stylet assembly is operable from a ready position and an implant position;

    the ready position is characterized by the stylet distal end being disposed proximally of the cannula distal end with a marker recess, having a proximal end, between the stylet distal end and the cannula distal end;

    the implant position is characterized by the stylet distal end being disposed distally of the marker recess proximal end,an imaging marker disposed within the marker recess;

    and an actuator operably coupled to the delivery assembly operable to transition the delivery assembly through each of at least three configurations;

    a first configuration characterized in that the cannula is positioned in the extended cannula position and the stylet assembly is positioned in the ready position;

    a second configuration characterized in that the cannula is positioned in the extended cannula position and the stylet assembly is positioned in the implant position; and

    a third configuration characterized in that, in unison, the cannula is retracted from the extended cannula position to the retracted cannula position and the stylet is retracted from the implant position into the handle.

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