Tip for lead extraction device

Abstract

A tip for engagement with an elongated sheath member for use in extracting an implanted structure, such as a cardiac lead, from an obstruction in a body vessel of a patient. The tip includes a tip body having a smaller diameter proximal end and a larger diameter distal end. The smaller diameter proximal end of the tip is sized for engagement with an inner surface of the distal end of the sheath member. The larger diameter distal end of the tip includes at least one element disposed along at least a portion of the outer surface of the tip body distal end. The element has a shape configured for cutting and/or disrupting the lead from the obstruction.

1 . A tip for engagement with an elongated sheath member for extracting an implanted structure from an obstruction in a body vessel of a patient, said sheath member having a proximal end, a distal end, and a passageway for said implanted structure extending therethrough, said tip comprising: 
 a tip body having a smaller diameter proximal end and a larger diameter distal end, said smaller diameter proximal end sized for engagement with an inner surface of said sheath member distal end, said tip body distal end including at least one element disposed along at least a portion of an outer surface thereof, said element configured for at least one of cutting and disrupting said implanted structure from said obstruction.    
     
     
         2 . The tip of  claim 1 , wherein said at least one element comprises a disruptor element, said disruptor element being disposed along at least a portion of said outer surface and an inner surface of said tip body distal end.  
     
     
         3 . The tip of  claim 1 , wherein said at least one element comprises a disruptor element, said disrupter element comprising a helical structure disposed along at least said outer surface of said tip body.  
     
     
         4 . The tip of  claim 3 , wherein said disruptor element comprises a plurality of helices disposed along said outer surface of said tip body.  
     
     
         5 . The tip of  claim 1 , wherein said distal end of said tip body comprises a plurality of perforations therethrough, and wherein said at least one element comprises a generally helical disrupter element winding through said perforations.  
     
     
         6 . The tip of  claim 1 , wherein said tip body proximal end includes an attachment member for engaging said inner surface of said sheath member distal end.  
     
     
         7 . The tip of  claim 6 , wherein said attachment member comprises a plurality of rings spaced along said tip body outer surface.  
     
     
         8 . The tip of  claim 7 , wherein said rings are aligned in order of increasing ring width in a direction of said tip distal end.  
     
     
         9 . The tip of  claim 8 , wherein at least some of said rings include a cut-out portion for inhibiting rotation of said tip upon engagement with said sheath member.  
     
     
         10 . The tip of  claim 1 , wherein said larger diameter portion comprises a serrated surface.  
     
     
         11 . The tip of  claim 10 , wherein said tip body distal end further comprises a threaded portion distal of said serrated surface.  
     
     
         12 . The tip of  claim 1 , wherein said tip larger diameter distal end tapers in a distal direction to a fluted terminal portion.  
     
     
         13 . The tip of  claim 1 , wherein said tip larger diameter distal end tapers to a generally tulip-shaped terminal portion, said distal end comprising a plurality of axial slots extending to a terminal portion of said tip, said tip further comprising a sleeve member extending axially therethrough, said sleeve member sized for receiving said implanted structure.  
     
     
         14 . The tip of  claim 1 , wherein said larger diameter distal end includes a plurality of nubs axially extending therefrom.  
     
     
         15 . The tip of  claim 1 , wherein said larger diameter distal end includes a plurality of grooves disposed along a terminal portion of said distal end.  
     
     
         16 . The tip of  claim 1 , wherein said larger diameter distal end includes a plurality of alternating tipped projections and grooves between adjacent projections.  
     
     
         17 . A tip for use with an elongated sheath member for extracting an implanted structure from an obstruction in a body vessel of a patient, said sheath member having a proximal end, a distal end, and a passageway for said implanted structure extending therethrough, said tip comprising: 
 a tip body having a smaller diameter proximal end and a larger diameter distal end, said smaller diameter proximal end sized for engagement with an inner surface of said sheath member distal end, said tip body proximal end including an attachment member for engagement with said sheath member inner surface, and said tip body distal end including at least one element disposed along an outer surface thereof, said element being configured for at least one of cutting and disrupting said obstruction.    
     
     
         18 . The tip of  claim 17 , wherein said attachment member comprises a plurality of rings spaced along said tip body outer surface, said rings being aligned in order of increasing ring width in a direction of said tip distal end, and said at least one element comprises a disruptor element disposed along said outer surface and extending along an inner surface of said tip body distal end.  
     
     
         19 . A device for extracting an implanted structure from an obstruction in a body vessel of a patient, the device comprising: 
 an elongated sheath having a proximal end, a distal end, and a passageway extending therethrough sized for receiving said implanted structure, said sheath having a length such that at least a distal portion of said sheath is receivable in said body vessel, said passageway sized such that said implanted structure is receivable therein;    a drive member operationally engaged with said elongated sheath for driving at least one of rotational and axial movement of said sheath; and    a tip engaged with said sheath distal end, said tip including a disruptor element at a distal end thereof for disrupting the obstruction.    
     
     
         20 . The tip of  claim 19 , wherein said disruptor element is disposed at an outer surface and an inner surface of a distal portion of said tip.