Torqueable and deflectable medical device shaft

• US 8,172,829 B2
• Filed: 08/23/2010
• Issued: 05/08/2012
• Est. Priority Date: 05/22/2001
• Status: Expired due to Fees

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: Farnholtz, Roger
• Primary Examiner(s): Lucchesi, Nicholas
• Assistant Examiner(s): Berdichevsky, Aarti B
• Application Number:
  US12/861,269
• Publication Number:
  US 20100324482A1
• Time in Patent Office: 624 Days
• Field of Search: 604/95, 604/95.01, 604/95.03, 604/95.04, 604/95.05, 604/524, 604/525, 604/526, 604/527, 604/528
• US Class Current: 604/523
• CPC Class Codes: A61M 2205/0266 Shape memory materials
• CPC Class Codes: A61M 25/0051 made from fenestrated or weakened tubing layer
• CPC Class Codes: A61M 25/0053 having a variable stiffness along the longitudinal axis, e.g. by varying the pitch of the coil or braid
• CPC Class Codes: A61M 25/0054 with regions for increasing flexibility
• CPC Class Codes: A61M 25/0138 having flexible regions as a result of weakened outer material, e.g. slots, slits, cuts, joints or coils
• CPC Class Codes: A61M 25/0147 with movable mechanical means, e.g. pull wires

Abstract

A medical device shaft for connection with a handle and for insertion within a body includes an elongated, deflectable shaft having a proximal shaft portion, an intermediate shaft portion, and a distal shaft portion. The elongated, deflectable shaft includes a transition in stiffness from the proximal shaft portion to the distal shaft portion. In a preferred implementation, the shaft includes a plurality of slits that extend perpendicular to a longitudinal axis of the shaft. Varying at least one of the number of slits, the location of slits, the frequency of slits, the orientation of the slits, the size of the slits, and the depth of the slits varies the transition of stiffness.

Claims

1. A medical device, comprising:

an elongated tubular member including a proximal end and a distal end;

a braided member attached to the distal end of the elongated tubular member and extending distally therefrom; and

a plurality of slits defined in the tubular member and extending perpendicularly to a longitudinal axis of the tubular member; and

a first polymer layer disposed over the elongated tubular member;

wherein at least one of the number of slits, the location of slits, the frequency of slits, the orientation of the slits, the size of the slits and the depth of the slits are varied to vary the stiffness of the proximal and intermediate portions of the tubular member; and

wherein at least a portion of the braided member is disposed over and contacting the first polymer layer.

2. The medical device of claim 1, further comprising a second polymer layer disposed over the tubular member and the braided member.