Shape memory polymer actuator and catheter

• US 20030236533A1
• Filed: 06/20/2002
• Published: 12/25/2003
• Est. Priority Date: 06/20/2002
• Status: Abandoned Application

• Current Assignee: Lawrence Livermore National Security LLC (Government of the United States of America)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Ahre, Paul E., Little, Steve L., Wilson, Thomas S., Schumann, Daniel L., Maitland, Duncan
• Application Number:
  US10/177,225
• Publication Number:
  US 20030236533A1
• Time in Patent Office: Days
• US Class Current: 606/127
• CPC Class Codes: A61B 17/22031 Gripping instruments, e.g. forceps, for removing or smashing calculi A61B17/221 takes precedence
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 2017/00398 using powered actuators, e.g. stepper motors, solenoids
• CPC Class Codes: A61B 2017/00867 shape memory effect for prostheses A61F2210/0014
• CPC Class Codes: A61B 2017/00871 polymeric
• CPC Class Codes: A61B 2017/22034 for gripping the obstruction or the tissue part from inside
• CPC Class Codes: A61B 2017/2217 single wire changing shape to a gripping configuration

Abstract

A system for removing an occlusion from a vessel. The system utilizes a shape memory polymer device for acting upon the occlusion. A transport vehicle moves a shape memory material through the vessel. The shape memory material is adapted to move from a first unexpanded coil shape to move through or around the occlusion, to a second expanded coil shape for acting upon the occlusion. A heat transfer mechanism is operatively connected to the shape memory material and is adapted to transfer heat to the shape memory material to move the shape memory material from the first shape to the second shape. The transport vehicle and the shape memory polymer material is withdrawn through the conduit carrying the occlusion matter. The system may include a second shape memory polymer device situated so that the occlusion material is gripped from both sides to facilitate removal.

Claims

1. A shape memory polymer device for acting upon a material in a conduit, comprising:

a transport vehicle adapted to move through said conduit,

a shape memory material operatively connected to said transport vehicle, said shape memory material adapted to move through or around said material while in a first shape and capable to transition from a first shape to a second and different shape for acting upon said material, and

a heat transfer mechanism operatively connected to said shape memory material, adapted to transfer heat to said shape memory material to transition said shape memory material from said first shape to said second shape.

2. The shape memory device of claim 1, wherein said conduit is a vascular or a non-vascular conduit.

3. The shape memory device of claim 2, wherein said conduit is a vascular conduit.

4. The shape memory device of claim 3, wherein said shape memory material is in the general shape of a wire.

5. The shape memory device of claim 3, wherein said shape memory material in the general shape a wire that can be expanded to form an expanded coil.

6. The shape memory device of claim 3, wherein said first shape is an unexpanded coil shape and said second shape is an expanded coil shape.

7. The shape memory device of claim 3, including a second shape memory material operatively connected to said transport vehicle adapted to move through said conduit and is capable to transition from a first shape to a second and different shape for acting upon said material.

8. The shape memory device of claim 7, wherein said second shape memory material is adapted to move through said conduit and capable to transition from a first shape to a second and different shape so that the material is gripped between the two shape memory devices.

9. The shape memory device of claim 3, wherein said heat transfer mechanism includes an optical fiber.

10. The shape memory device of claim 3, wherein said heat transfer mechanism is induced heating.

11. The shape memory device of claim 3, wherein said heat transfer mechanism is electrical induction heating.

12. The shape memory device of claim 3, wherein said heat transfer mechanism is electrothermal heating.

13. The shape memory device of claim 3, wherein said heat transfer mechanism utilizes acoustic energy source.

14. The shape memory device of claim 3, wherein said heat transfer mechanism utilizes ultrasonic energy.

15. The shape memory device of claim 3, wherein said heat transfer mechanism utilizes radio frequency (RF) energy.

16. The shape memory device of claim 3, wherein said heat transfer mechanism utilizes magnetic energy.

17. The shape memory device of claim 9, including a catheter operatively connected to said optical fiber and said shape memory material.

18. The shape memory device of claim 9, including a delivery catheter operatively connected to said transport vehicle, to said optical fiber, and to said shape memory material.

21. The shape memory device of claim 2, wherein said conduit is a vascular conduit.

22. The shape memory device of claim 3, wherein said material is gripped between said first shape memory material and said second shape memory material.

19. A shape memory polymer device for acting upon a material in a conduit, comprising:

a transport vehicle adapted to move through said conduit,

a first shape memory material operatively connected to said transport vehicle, said first shape memory material adapted to move through or around said material while in a first shape and capable of transitioning from said first shape to a second and different shape for acting upon said material,

a second shape memory material operatively connected to said transport vehicle adapted to move through said conduit and capable of transitioning from an initial shape to a different shape for acting upon said material, and

a heat transfer mechanism operatively connected to said first shape memory material and said second shape memory material, adapted to transfer heat to said first shape memory material and said second shape memory material to transition said first shape memory material from said first shape to said second shape and to transition said second shape memory material from said initial shape to said different shape.

20. The shape memory device of claim 19, wherein said conduit is a vascular or a non-vascular conduit.

23. A method of removing matter from a conduit, comprising the steps of:

passing a transport vehicle and a shape memory polymer material through said conduit,

passing said shape memory polymer material through or around said matter,

transmitting energy to said shape memory polymer material for moving said shape memory polymer material from a first shape to a second and different shape, and

withdrawing said transport vehicle and said shape memory polymer material through said conduit carrying said matter.

24. The method of removing matter from a conduit of claim 23 wherein said conduit is a vascular or a non-vascular conduit.

25. The method of removing matter from a conduit of claim 24 wherein said conduit is a vascular conduit.

26. The method of removing matter from a conduit of claim 23 wherein said first shape is an unexpanded coil shape and said second shape is an expanded coil shape.

27. The method of removing matter from a conduit of claim 23 wherein said step of transmitting energy to said shape memory polymer material includes transmitting light through an optical fiber.

28. The method of removing matter from a conduit of claim 23 wherein an induced heating mechanism is used in said step of transmitting energy to said shape memory polymer material.

29. The method of removing matter from a conduit of claim 23 wherein an electrical induction heating mechanism is used in said step of transmitting energy to said shape memory polymer material.

30. The method of removing matter from a conduit of claim 23 wherein an electrothermal heating mechanism is used in said step of transmitting energy to said shape memory polymer material.

31. The method of removing matter from a conduit of claim 23 wherein an acoustic energy transfer source is used in said step of transmitting energy to said shape memory polymer material.

32. The method of removing matter from a conduit of claim 23 wherein an ultrasonic energy transfer source is used in said step of transmitting energy to said shape memory polymer material.

33. The method of removing matter from a conduit of claim 23 wherein a radio frequency (RF) energy transfer source is used in said step of transmitting energy to said shape memory polymer material.

34. The method of removing matter from a conduit of claim 23 wherein a magnetic energy transfer source is used in said step of transmitting energy to said shape memory polymer material.

35. The method of removing matter from a conduit of claim 23 including the step of using a delivery catheter to carry said catheter and said shape memory polymer material to said matter.

36. The method of removing matter from a conduit of claim 23 including the steps of transmitting light energy through an optical fiber to said shape memory polymer material and using a catheter to direct said shape memory polymer material to said matter.

37. The method of removing matter from a conduit of claim 36 including the step of using a guide catheter to move said catheter, said optical fiber, and said shape memory material through said conduit.

38. The method of removing matter from a conduit of claim 23 including the step of using a second shape memory polymer material to grip said matter.

39. A method of removing matter from a conduit, comprising the steps of:

passing a transport vehicle carrying a first shape memory polymer material and a second shape memory material through said conduit,

passing said first shape memory polymer material through or around said matter,

positioning said second shape memory polymer material adjacent said matter,

transmitting energy to said first shape memory polymer material for moving said first shape memory polymer material from a first shape to a second and different shape and for moving said second shape memory material from an initial shape to a different shape, and

withdrawing said transport vehicle, said first shape memory polymer material, and said second shape memory polymer material through said conduit carrying said matter.

40. The method of removing matter from a conduit of claim 39 wherein said first shape memory polymer material and said second shape memory polymer material grip said matter.