Method of manufacturing a catheter sheath

• US 9,700,696 B2
• Filed: 08/12/2011
• Issued: 07/11/2017
• Est. Priority Date: 08/13/2010
• Status: Expired due to Fees

• Current Assignee: Cathrx Ltd
• Original Assignee: Cathrx Ltd
• Inventors: Ogle, David, Partlett, Matthew, Ryan, Garrett
• Primary Examiner(s): Vo, Peter DungBa
• Assistant Examiner(s): Parvez, Azm
• Application Number:
  US13/816,729
• Publication Number:
  US 20130150808A1
• Time in Patent Office: 2,160 Days
• Field of Search: 29825, 29829, 295921, 604264
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61M 25/0009 Making of catheters or other medical or surgical tubes
• CPC Class Codes: A61M 25/0012 with embedded structures, e.g. coils, braids, meshes, strands or radiopaque coils
• CPC Class Codes: A61M 25/0015 Making lateral openings in a catheter tube, e.g. holes, slits, ports, piercings of guidewire ports; Methods for processing the holes, e.g. smoothing the edges
• CPC Class Codes: A61M 25/0043 characterised by structural features
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing

Abstract

A catheter sheath comprises a tubular member connected to a catheter handle, the tubular sheath including one or more electrical conductors and one or more electrode rings attached to the tip of the tubular member. The tubular member further includes at least one opening that allows the one or more electrical conductors to be electrically connected to the one or more electrode rings. The electrode ring is slid over the tubular member so as to cover the at least one opening. The tubular member and the electrode ring are subjected to heat treatment by induction heating so that the material of the tubular member melts locally around the electrode ring to form a seal between the tubular member and the electrode ring.

Claims

1. A method of manufacturing a catheter sheath, comprising:

providing a tubular member of non-conductive material having a proximal end and a distal end, the tubular member further having one or more electrical conductors extending from the proximal end to the distal end within the tubular member;

forming at least one opening in an outer wall of the tubular member for accessing the one or more electrical conductors within the tubular member;

placing at least one conductive element on the outer wall of the tubular member in electrically conductive connection with the one or more electrical conductors so that the at least one conductive element is adjacent to and surrounding the at least one opening;

induction heating the at least one conductive element so that the tubular member melts locally adjacent the at least one conductive element to attach the at least one conductive element to the outer wall of the tubular member and form a seal between the tubular member and the at least one conductive element at least along each edge of the at least one conductive element; and

applying a mold over the at least one conductive element prior to the induction heating to constrain the local melting of the tubular member to fill a transition zone between edges of the at least one conductive element and the tubular member.

2. The method of claim 1, wherein attaching the at least one conductive element on the tubular member further comprises applying a radial force to the at least one conductive element prior to the induction heating.

3. The method of claim 2, wherein applying the radial force comprises compressing the at least one conductive element so that an outer surface of the at least one conductive element lies flush with the outer wall of the tubular member.

4. The method of claim 2, further comprising swaging the at least one conductive element prior to the induction heating.

5. The method of claim 3, wherein applying a mold comprises applying a sacrificial heat-shrink member, and further comprising shrinking the heat-shrink sleeve responsive to the induction heating of the at least one conductive element and constraining the local melting of the tubular member to fill the transition zone.

6. The method of claim 1, wherein the one or more electrical conductors are arranged within a lumen defined by the tubular member.

7. The method of claim 1, wherein the one or more electrical conductors are arranged between an inner wall and an outer wall of the tubular member.

8. The method of claim 1, wherein the at least one conductive element includes a ring electrode snug fit about the tubular member.

9. The method of claim 3, further comprising swaging the at least one conductive element.

10. A method of manufacturing a catheter sheath, comprising:

providing a tubular member of non-conductive material having a proximal end and a distal end, the tubular member further having one or more electrical conductors extending from the proximal end to the distal end within the tubular member;

forming at least one opening in an outer wall of the tubular member for accessing the one or more electrical conductors within the tubular member;

placing at least one conductive element comprising a conductive ring on the outer wall of the tubular member in electrically conductive connection with the one or more electrical conductors so that the at least one conductive element is adjacent to and surrounding the at least one opening;

reducing a diameter of the conductive ring after the placing on the outer wall of the tubular member to be flush with a diameter of the tubular member;

induction heating the at least one conductive element so that the tubular member melts locally adjacent the at least one conductive element to attach the at least one conductive element to the outer wall of the tubular member and form a seal between the tubular member and the at least one conductive element at least along each edge of the at least one conductive element; and

filling a transition zone between edges of the conductive ring and the tubular member with material of the tubular member by the induction heating of the at least one conductive element and local melting of the tubular member.

11. The method of claim 10, further comprising placing a mold about the conductive ring and longitudinally adjacent the outer wall of the tubular member prior to the induction heating and constraining local melting of the tubular member to fill a transition zone with the mold.

12. The method of claim 10, further comprising placing a sacrificial heat-shrink sleeve about the conductive ring and longitudinally adjacent the outer wall of the tubular member prior to the induction heating, shrinking the heat-shrink sleeve responsive to the induction heating of the at least one conductive element and constraining local melting of the tubular member to fill a transition zone.