Magnetic engagement of catheter to implantable device

• US 20070118215A1
• Filed: 11/16/2006
• Published: 05/24/2007
• Est. Priority Date: 11/16/2005
• Status: Abandoned Application

• Current Assignee: MiCardia Corporation
• Original Assignee: MiCardia Corporation
• Inventors: Moaddeb, Shahram
• Application Number:
  US11/600,470
• Publication Number:
  US 20070118215A1
• Time in Patent Office: Days
• US Class Current: 623/2.370
• CPC Class Codes: A61F 2/2445 Annuloplasty rings in direct contact with the valve annulus
• CPC Class Codes: A61F 2/2448 D-shaped rings
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2210/009 magnetic
• CPC Class Codes: A61F 2250/0001 Means for transferring electromagnetic energy to implants
• CPC Class Codes: A61F 2250/0004 adjustable
• CPC Class Codes: A61F 2250/0082 specially designed for children, e.g. having means for adjusting to their growth

Abstract

An annuloplasty device for supporting a heart valve is described. The system includes a body member having a proximal end, a distal end, and a length extending therebetween. The body member is configured to be implanted within a patient'"'"'s heart at or near a base of a heart valve. The body member includes a first portion, including a shape memory material and being transformable from a first configuration to a second configuration in response to an activation energy. The body member also includes a second portion coupled to the first portion. The second portion includes a magnetic material that is responsive to a magnetic field. When in position at or near the base of the heart valve and when the body member transforms from the first configuration to the second configuration, the body member reshapes a tissue of the heart so as to exert a force on the heart valve base.

Claims

1. An annuloplasty device, for supporting a heart valve, comprising:

a body member having a proximal end, a distal end, and a length extending therebetween, the body member configured to be implanted within a patient'"'"'s heart at or near a base of a heart valve;

wherein the body member comprises;

a first portion, comprising a shape memory material and being transformable from a first configuration to a second configuration in response to an activation energy; and

a second portion coupled to the first portion, the second portion comprising a magnetic material that is responsive to a magnetic field; and

wherein, when in position at or near the base of the heart valve and when the body member transforms from the first configuration to the second configuration, the body member reshapes a tissue of the heart so as to exert a force on the heart valve base.

2. The annuloplasty device of claim 1, wherein the magnetic material is located at the proximal end or the distal end of the body member.

3. The annuloplasty device of claim 1, wherein the magnetic material is located at the proximal end and the distal end of the body member.

4. The annuloplasty device of claim 1, wherein the magnetic material is located between the proximal end and the distal end of the body member.

5. The annuloplasty device of claim 1, wherein the magnetic material is in thermal communication with the first portion of the body member.

6. The annuloplasty device of claim 1, wherein the magnetic material is in thermal communication with the shape memory material.

7. The annuloplasty device of claim 1, wherein the magnetic material comprises at least one of a permanent magnet, a ceramic magnet, an electromagnet, a polymer-bonded magnet, an isotropic material, and an anisotropic material.

8. The annuloplasty device of claim 1, wherein the magnetic material produces a force in a range between 0.2 pounds of force and 2.0 pounds of force at a distance of one millimeter to ten millimeters, with a magnetic field in a range between 100 Gauss and 10,000 Gauss.

9. The annuloplasty device of claim 1, further comprising:

a conducting element that extends at least partially along the length of the body member; and

wherein the first portion of the body member at least partially contacts the conducting element.

10. The annuloplasty device of claim 9, wherein the shape memory material at least partially contacts the conducting element.

11. The annuloplasty device of claim 9, wherein the second portion of the body member comprises at least one of a round wire, a flat wire, a ribbon, a mesh wire, a rod-shaped wire, and a band-shaped wire.

12. The annuloplasty device of claim 9, wherein the conducting element comprises at least one of a round wire, a flat wire, a ribbon, a mesh wire, a rod-shaped wire, and a band-shaped wire.

13. The annuloplasty device of claim 1, wherein the first portion of the body member comprises a tubular structure, and wherein at least part of the second portion of the body member passes through the tubular structure.

14. The annuloplasty device of claim 1, wherein the activation energy comprises a magnetic energy.

15. The annuloplasty device of claim 1, wherein the activation energy comprises acoustic energy.

16. The annuloplasty device of claim 1, wherein the activation energy comprises radio frequency energy.

17. The annuloplasty device of claim 1, wherein the activation energy comprises electrical energy.

18. The annuloplasty device of claim 1, wherein the activation energy comprises thermal energy.

19. The annuloplasty device of claim 1, wherein the shape memory material transforms from the first configuration to the second configuration at or near an activation temperature in response to the activation energy.

20. An annuloplasty system, comprising:

the annuloplasty device of claim 1;

and

an activation device that emanates a magnetic field that is configured magnetically to engage the magnetic material of the second portion of the body member.

21. An annuloplasty activation system for percutaneously activating an adjustable annuloplasty device, the system comprising:

an elongate member having a proximal end and distal end, the distal end configured to be inserted percutaneously into a vein of a patient, further configured to be inserted across a fossa ovalis in an interatrial septum of a patient, and further configured to be inserted into the left atrium of the patient while the proximal end is located outside the patient'"'"'s body; and

a distal element at the distal end of the elongate member, the distal element configured to emanate a magnetic field within the left atrium;

wherein the distal element comprises at least one of a permanent magnet and an electromagnet, the electromagnet being activatable from outside the patient'"'"'s body.

22. The annuloplasty activation system of claim 21, further comprising an annuloplasty device, comprising:

a body member having a proximal end, a distal end and a length extending therebetween, the body member configured to be implanted within a patient'"'"'s heart at or near a base of a heart valve;

wherein the body member comprises;

a first portion, comprising a shape memory material and being transformable from a first configuration to a second configuration in response to an activation energy; and

a second portion coupled to the first portion, the second portion comprising a magnetic material that is responsive to a magnetic field; and

wherein, when in position at or near the base of the heart valve and when the body member transforms from the first configuration to the second configuration, the body member reshapes a tissue of the heart so as to exert a force on the heart valve base.

23. A method for changing a dimension of a heart valve annulus, said method comprising:

providing an annuloplasty device comprising;

a body member having a proximal end, a distal end, and a length extending therebetween, the body member configured to be implanted within a patient'"'"'s heart at or near a base of a heart valve;

wherein the body member comprises;

a first portion, comprising a shape memory material and being transformable from a first configuration to a second configuration in response to an activation energy; and

a second portion coupled to the first portion, the second portion comprising a magnetic material that is responsive to a magnetic field; and

wherein, when in position at or near the base of the heart valve and when the body member transforms from the first configuration to the second configuration, the body member reshapes a tissue of the heart so as to exert a force on the heart valve base;

providing an annuloplasty activation system comprising;

an elongate member having a proximal end and distal end, the distal end configured to be inserted percutaneously into a vein of a patient, further configured to be inserted across a fossa ovalis in an interatrial septum of a patient, and further configured to be inserted into the left atrium of the patient while the proximal end is located outside the patient'"'"'s body; and

a distal element at the distal end of the elongate member, the distal element configured to emanate a magnetic field within the left atrium;

wherein the distal element comprises at least one of a permanent magnet and an electromagnet, the electromagnet being activatable from outside the patient'"'"'s body; and

inserting the elongate member into the left atrium of the patient;

magnetically engaging the annuloplasty activation system to the annuloplasty device; and

activating the annuloplasty device such that the body member transforms from the first configuration to the second configuration, thereby reshaping a tissue of the heart so as to exert a force on the heart valve base.

24. The method of claim 23, wherein magnetically engaging the annuloplasty activation system to the annuloplasty device comprises at least a part of the distal element of the annuloplasty activation system contacting at least a part of the second portion of the annuloplasty device.

25. The method of claim 23, wherein activating the annuloplasty device comprises providing an activation energy to the annuloplasty device.

26. The method of claim 25, wherein the activation energy comprises electric energy, thermal energy, magnetic energy, acoustic energy, and radio frequency energy.

27. The method of claim 23, wherein the heart tissue is reshaped by decreasing a dimension of the heart valve annulus.

28. A system for reshaping or reforming a heart valve annulus, the system comprising:

means for magnetically engaging an elongate member to an annuloplasty device while inside a body, the annuloplasty device configured to be implanted at or near the heart valve annulus; and

means for changing at least one dimension of the heart valve annulus while transforming the annuloplasty device from a first configuration to a second configuration and while the elongate member is engaged to the annuloplasty device.

29. A system for reshaping or reforming a heart valve annulus, the system comprising:

a magnet located in or on an elongate member, the magnet configured to engage an annuloplasty device configured to be implanted at or near the heart valve annulus;

an energy transfer module configured to change at least one dimension of the heart valve annulus while transforming the annuloplasty device from a first to second configuration and while the elongate member is engaged to the annuloplasty device.