Medical device for removing an implanted object using laser cut hypotubes

Abstract

Methods and devices for separating an implanted object, such as a pacemaker lead, from tissue surrounding such object in a patient's vasculature system. Specifically, the surgical device includes a handle, an elongate inner sheath and a circular cutting blade that extends from the distal end of the sheath upon actuating the handle. The circular cutting blade is configured to engage the tissue surrounding an implanted lead and cut such tissue in a coring fashion as the surgical device translates along the length of the lead, thereby allowing the lead, as well as any tissue remaining attached to the lead, to enter the device's elongate shaft. The surgical device has a barrel cam cylinder in the handle assembly that imparts rotation of the blade and a separate cam mechanism in the tip of outer sheath assembly that imparts and controls the extension and retraction of the blade. The barrel cam cylinder and cam mechanism cooperate to cause the blade to rotate in a first direction and extend from and retract in the outer sheath due to a first actuation of the handle and to rotate in a second direction and extend and retract in the outer sheath due to a second actuation of the handle. The inner sheath and outer sheath are constructed of laser-cut hypotubes, thereby allowing the surgical device, particularly the sheath assembly, to have a smaller profile for navigating smaller sized vasculature.

1 - 20 . (canceled) 
     
     
         21 . A device for removing an implanted object from a body vessel, the device comprising:
 a sheath assembly comprising an outer sheath assembly and an inner sheath assembly, and a pin;
 the outer sheath assembly comprising an outer sheath and an outer band, the outer band coupled to the pin, wherein at least a portion of the outer sheath comprises an outer hypotube, the outer hypotube comprising a first plurality of kerfs; 
 the inner sheath assembly comprising an inner sheath and a tip, wherein the tip has a cutting surface, wherein the inner sheath is rotatably disposed within the outer sheath, and wherein at least a portion of the inner sheath comprises an inner hypotube, the inner hypotube comprising a second plurality of kerfs;
 the inner sheath comprising a proximal end and a distal end, wherein the distal end of the inner sheath is coupled to the tip; 
 the tip comprising a cam slot for receipt of the pin, the cam slot and the pin facilitating translation of the tip relative to the outer band upon rotation of the inner sheath relative to the outer sheath. 
 
   
     
     
         22 . The device of  claim 21 , wherein the first plurality of kerfs extend in a spiral pattern along the outer hypotube. 
     
     
         23 . The device of  claim 22 , wherein the first plurality of kerfs are spaced at a variable pitch along the outer hypotube. 
     
     
         24 . The device of  claim 22 , wherein the spiral pattern is a first spiral pattern, and the second plurality of kerfs extend in a second spiral pattern along the inner hypotube. 
     
     
         25 . The device of  claim 21 , wherein the second plurality of kerfs extend in a spiral pattern along the inner hypotube. 
     
     
         26 . The device of  claim 25 , wherein the second plurality of kerfs are spaced at a variable pitch along the inner hypotube. 
     
     
         27 . The device of  claim 21 , wherein the outer hypotube comprises a first segment and a second segment, and wherein the first plurality of kerfs are spaced at a constant pitch in the first segment and the first plurality of kerfs are spaced at a variable pitch in the second segment. 
     
     
         28 . The device of  claim 27 , wherein the first segment is disposed distally relative to the second segment. 
     
     
         29 . The device of  claim 27 , wherein the variable pitch increases distally to proximally. 
     
     
         30 . The device of  claim 21 , wherein the first plurality of kerfs extend in a spiral pattern along the outer hypotube, wherein the outer hypotube comprises a first segment and a second segment, and wherein the first plurality of kerfs have a constant pitch angle in the first segment and the first plurality of kerfs have a variable pitch angle in the second segment. 
     
     
         31 . The device of  claim 30 , wherein the first segment is disposed distally relative to the second segment. 
     
     
         32 . The device of  claim 21 , wherein the inner hypotube comprises a first segment and a second segment, and wherein the second plurality of kerfs are spaced at a constant pitch in the first segment and the second plurality of kerfs are spaced at a variable pitch in the second segment. 
     
     
         33 . The device of  claim 32 , wherein the first segment is disposed distally relative to the second segment. 
     
     
         34 . The device of  claim 32 , wherein the variable pitch increases distally to proximally. 
     
     
         35 . The device of  claim 21 , wherein the second plurality of kerfs extend in a spiral pattern along the inner hypotube, wherein the inner hypotube comprises a first segment and a second segment, and wherein the second plurality of kerfs have a constant pitch angle in the first segment and the second plurality of kerfs have a variable pitch angle in the second segment. 
     
     
         36 . The device of  claim 35 , wherein the first segment is disposed distally relative to the second segment. 
     
     
         37 . The device of  claim 21 , wherein the outer hypotube comprises a first outer segment disposed distally to a second outer segment, and wherein the first plurality of kerfs are spaced at a constant pitch in the first outer segment and the first plurality of kerfs are spaced at a variable pitch in the second outer segment, and wherein the inner hypotube comprises a first inner segment disposed distally to a second inner segment, and wherein the second plurality of kerfs are spaced at a constant pitch in the first inner segment and the second plurality of kerfs are spaced at a variable pitch in the second inner segment. 
     
     
         38 . The device of  claim 37 , wherein the first outer segment has a first outer length, the first inner segment has a first inner length, the first inner length being greater than the first outer length. 
     
     
         39 . The device of  claim 21 , wherein the outer hypotube comprises a first outer segment disposed distally to a second outer segment, and wherein the first plurality of kerfs have a constant pitch angle in the first outer segment and the first plurality of kerfs have a variable pitch angle in the second outer segment, and wherein the inner hypotube comprises a first inner segment disposed distally to a second inner segment, and wherein the second plurality of kerfs have a constant pitch angle in the first inner segment and the second plurality of kerfs have a variable pitch angle in the second inner segment. 
     
     
         40 . The device of  claim 39 , wherein the first outer segment has a first outer length, the first inner segment has a first inner length, the first inner length being greater than the first outer length.