Selectively activated shape memory device

• US 6,169,269 B1
• Filed: 08/11/1999
• Issued: 01/02/2001
• Est. Priority Date: 09/05/1996
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Maynard, Ronald S.
• Primary Examiner(s): Walberg, Teresa
• Assistant Examiner(s): Fuqua, Shawntina T
• Application Number:
  US09/371,986
• Time in Patent Office: 510 Days
• Field of Search: 219/209, 219/200, 219/201, 219/528, 219/549, 219/508, 604/281, 337/140
• US Class Current: 219/209
• CPC Class Codes: A61B 1/0058 using shape-memory elements
• CPC Class Codes: A61F 2/848 having means for fixation to the vessel wall, e.g. barbs
• CPC Class Codes: A61F 2/92 Stents in the form of a rolled-up sheet expanding after insertion into the vessel , e.g. with a spiral shape in cross-section
• CPC Class Codes: A61M 25/0158 with magnetic or electrical means, e.g. by using piezo materials, electroactive polymers, magnetic materials or by heating of shape memory materials
• CPC Class Codes: F03G 7/065 using a shape memory element

Abstract

A shape memory device includes a shape memory alloy member configured to have at least a portion of the shape memory alloy member be selectively activated. A heating device is coupled to the member and configured to provide heat to a selected section of the member and activate at least a portion of the selected section.

Claims

1. A shape memory device, comprising:

a shape memory alloy member configured to be selectably activated at a selected site of the member, the member including at least two independently activated elongated portions;

a heating device coupled to the member and configured to provide heat to a selected section of the member and activate at least a portion of the selected section.

2. The device of claim 1, wherein each elongated portion is activated.

3. The device of claim 1, wherein an activation of at least a portion of the selected section provides a variable Young'"'"'s modulus of at least a portion of the member.

4. The device of claim 1, wherein the heating device includes a micro-fabricated conductive path.

5. A medical device, comprising:

an elongated member having a proximal portion and a distal portion configured to be inserted into a body,

a temperature-activated actuator coupled to the elongated member, wherein the actuator is configured to move to a plurality of predetermined shapes and comprises at least two independently activated elongated portions; and

a heating device coupled to the temperature-activated actuator and configured to deliver thermal energy to at least a selected section of the actuator and activate at least a portion of the selected section.

6. The device of claim 5, wherein an activation of at least a portion of the selected section provides a variable Young'"'"'s modulus of at least a portion of the member.

7. The device of claim 5, wherein the heating device includes a micro-fabricated conductive path.

8. The medical device of claim 5, wherein the medical device includes a lumen positioned in an interior of the medical device.

9. The medical device of claim 5, further comprising:

means for providing slippage between the actuator and the elongated member of the medical device.

10. The medical device of claim 9 wherein the slippage providing means is a material having a low coefficient of friction.

11. The medical device of claim 10 wherein the elongated member comprises said material having a low coefficient of friction.

12. The medical device of claim 5 or claim 11 wherein the actuator is mounted around the elongated member.

13. The medical device of claim 11 further comprising an outer jacket mounted around the actuator.

14. The medical device of claim 5 or claim 11, further comprising a thermal insulator, mounted around the actuator.

15. The medical device of claim 14 wherein the thermal insulator is an outer jacket, mounted around the actuator.

16. The medical device of claim 5 or claim 11, further comprising means for coupling the actuator to the elongated member.

17. The medical device of claim 16 wherein the coupling means is an outer jacket, mounted around the actuator.

18. The medical device of claim 5, wherein the elongated member is provided with an internal lumen and wherein the actuator is mounted within the lumen.

19. The medical device of claim 5, wherein the elongated portions of the actuator comprise at least two segments separated from one another by a slot.

20. The medical device of claim 19 wherein the actuator extends longitudinally between proximal and distal ends and wherein the slot extends to only one of the proximal and distal ends.

21. The medical device of claim 19 wherein the actuator extends longitudinally between proximal and distal ends and wherein the slot extends to neither of the proximal and distal ends.

22. The medical device of claim 5, wherein the elongated portions of the actuator comprise finger-like segments.