Magnetically-coupled implantable medical devices

• US 5,762,599 A
• Filed: 05/02/1994
• Issued: 06/09/1998
• Est. Priority Date: 05/02/1994
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Influence Medical Technologies Ltd.
• Inventors: Sohn, Zev
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): SCHAETZLE, KENNEDY
• Application Number:
  US08/236,448
• Time in Patent Office: 1,499 Days
• Field of Search: 600/16, 600/17, 600/29, 600/30, 623/3, 417/420
• US Class Current: 600/30
• CPC Class Codes: A61F 2/0018 magnetic
• CPC Class Codes: A61M 25/00 Catheters; Hollow probes dilators A61M29/00; peritoneal catheters A61M1/285; tracheal tubes A61M16/04; for drainage A61M27/00; for uterus, vagina or rectum A61M31/00 ; for measuring or testing A61B; materials for catheters A61L29/00
• CPC Class Codes: A61M 60/126 implantable via, into, inside, in line, branching on, or around a blood vessel
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/178 drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices
• CPC Class Codes: A61M 60/237 the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
• CPC Class Codes: A61M 60/419 the force acting on the blood contacting member being permanent magnetic, e.g. from a rotating magnetic coupling between driving and driven magnets
• CPC Class Codes: A61M 60/812 Vanes or blades, e.g. static flow guides

Abstract

Medical apparatus includes an external drive magnet mounted for rotation externally of a subject'"'"'s body, an implantable driven magnet configured and dimensioned to be implantable in the subject'"'"'s body and mounted for rotation by magnetic coupling with the drive magnet and an implantable device mechanically coupled to the driven magnet to be driven thereby. The driven magnet is mountable for rotation in the subject'"'"'s body about an axis of rotation which is not collinear with the axis of rotation of the external drive magnet such that the magnetic poles of the external drive magnet are magnetically coupled sequentially with the magnetic poles of the implanted driven magnet to rotate the implanted driven magnet, thereby providing flexibility in the location, design and dimensions of the implanted driven magnet, and in the speed and torque ratios between the two magnets.

Claims

1. A medical apparatus, comprising:

a drive magnet, externally located with respect to a subject'"'"'s body, having a first axis, and mounted on a first support means for supporting said drive magnet along said first axis for rotation of said drive magnet about said first axis; and

,

an implant device implantable in the subject'"'"'s body, said implant device comprising a valve and a pump, said valve having a fluid inlet and outlet for passage of fluid through said valve;

said implant device further comprising a driven magnet having a second axis, said driven magnet being mounted on a second support means for supporting rotation of said driven magnet about said second axis by magnetic pole coupling with said drive magnet when said driven magnet is implanted in the subject'"'"'s body and said drive magnet is rotated sufficiently close to said driven magnet to be magnetically coupled thereto; and

,

said valve being mechanically linked to the rotation of said driven magnet such that said valve is selectively opened and closed by rotation of said driven magnet.

2. The apparatus according to claim 1, wherein said implant device is dimensioned to be contained in a fluid carrying vessel in the subject'"'"'s body.

3. The apparatus according to claim 2, wherein said fluid carrying vessel is the urethra.

4. The apparatus according to claim 1, wherein said valve comprises:

a housing containing said driven magnet, a plug means, and a screw and nut motion converter means for axially displacing said plug means toward and away from said outlet, said screw and nut motion converter means being coupled to said plug means and to said second support means of said driven magnet so that said plug means is axially displaceable towards said outlet upon rotation of said driven magnet in a first direction and is axially displaceable away from said outlet upon rotation of said driven magnet in a second direction.

5. The apparatus according to claim 4, wherein said screw and nut motion converter means comprises a screw and a nut, and wherein said nut is fixed in relation to said housing and said plug means is axially displaceable with respect to said outlet by rotation of said screw within said nut.

6. The apparatus according to claim 4, wherein said screw and nut motion converter means comprises a screw and a nut, and wherein said nut is axially displaceable by rotation of said screw, and said nut carries said plug means.

7. The apparatus according to claim 1, wherein said valve is provided with pressure-sensitive opening means to release urine through said valve at a predetermined pressure threshold.

8. The apparatus according to claim 1, wherein said valve comprises a housing containing said driven magnet;

a pivotal valve member having an open and a closed position, located at said outlet; and

a screw and nut motion converter connected to said valve member so as to pivot said valve member to said open position upon the rotation of said driven magnet in a first direction, and to pivot said valve member to said closed position, upon rotation of said driven magnet in a second direction, opposite to said first direction.

9. The apparatus according to claim 8, wherein said valve is provided with pressure-sensitive opening means to release urine through said valve at a predetermined pressure threshold.

10. The apparatus according to claim 1, wherein said drive magnet and said driven magnet are each provided with more than two magnetic poles.

11. The apparatus according to claim 1, wherein said drive magnet and said driven magnet are different in size.

12. The apparatus according to claim 1, wherein said pump further comprises at least one stationary guide vane.

13. The apparatus according to claim 1, wherein said pump is mechanically coupled to said valve by a coupling means which permits said pump to continue pumping fluid by rotation of said driven magnet even after said valve has been moved to an open position.

14. The apparatus according to claim 13, wherein said coupling means comprises a threaded nut and a partially threaded screw.

15. A medical apparatus, comprising:

a drive magnet, externally located with respect to a subject'"'"'s body, having a first axis and mounted on a first support means for supporting said drive magnet along said first axis for rotation about said first axis;

an implant device implantable in the subject'"'"'s body, said implant device comprising a driven magnet having a second axis, said driven magnet being implantable in the subject'"'"'s body and mounted on a second support means for supporting rotation of said driven magnet along said second axis by magnetic pole coupling with said drive magnet when said driven magnet is implanted in the subject'"'"'s body and said drive magnet is rotated sufficiently close to said driven magnet to be magnetically coupled thereto;

said implant device further comprising a valve, said valve having a fluid inlet and outlet for passage of fluid through said valve, said valve being mechanically linked to the rotation of said driven magnet such that said valve is selectively opened and closed by rotation of said driven magnet; and

,

said valve further comprising a plug means, and a screw and nut motion converter means for axially displacing said plug means toward and away from said outlet, said screw and nut motion converter means connected to said plug means and to said second support means of said driven magnet so that said plug means is axially displaceable towards said outlet upon rotation of said driven magnet in a first direction and is axially displaceable away from said outlet upon rotation of said driven magnet in a second direction.

16. The apparatus according to claim 15, wherein said implant device is configured and dimensioned to be contained in a fluid carrying vessel in the subject'"'"'s body.

17. The apparatus according to claim 16, wherein said fluid carrying vessel is the urethra.

18. The apparatus according to claim 17, further comprising a pump.

19. The apparatus according to claim 17, wherein said driven magnet is contained in a housing, said housing comprising a tube dimensioned to be contained in a fluid carrying vessel of the subject'"'"'s body.

20. The apparatus according to claim 15, wherein driven magnet is contained in a housing and said screw and nut motion converter means comprises a screw and a nut, said nut being fixed in relation to said housing and said plug means being axially displaceable with respect to said outlet by rotation of said screw within said nut.

21. The apparatus according to claim 15, wherein said screw and nut motion converter means comprises a screw and a nut, and wherein said nut is axially displaceable by rotation of said screw, and said nut carries said plug means.

22. The apparatus according to claim 15, wherein said valve is provided with pressure-sensitive opening means to release urine through said valve at a predetermined pressure threshold.

23. The apparatus according to claim 15, wherein said drive magnet and said driven magnet are each provided with more than two magnetic poles.

24. The apparatus according to claim 15, wherein said drive magnet and said driven magnet are different in size.

25. A medical apparatus, comprising:

a drive magnet, externally located with respect to a subject'"'"'s body, having a first axis and mounted on a first support means for supporting said drive magnet along said first axis for rotation about said first axis; and

,

an implant device implantable in the subjects body, said implant device comprising a driven magnet, said driven magnet having a second axis and being mounted on a second support means for supporting rotation of said driven magnet along said second axis by magnetic pole coupling with said drive magnet when said driven magnet is implanted in the subject'"'"'s body and said drive magnet is rotated sufficiently close to said driven magnet to be magnetically coupled thereto;

said implant device comprising a valve, said valve having a fluid inlet and outlet for passage of fluid through said valve, said valve being mechanically linked to the rotation of said driven magnet such that said valve is selectively opened and closed by rotation of said driven magnet, said valve comprises a housing containing said driven magnet, a pivotal valve member having an open and a closed position, located at said outlet; and

a screw and nut motion converter means connected to said valve member so as to pivot said valve member to said open position upon the rotation of said driven magnet in a first direction, and to pivot said valve member to said closed position upon rotation of said driven magnet in the opposite direction.

26. The apparatus according to claim 25, wherein said implant device is dimensioned to be contained in a fluid carrying vessel in the subject'"'"'s body.

27. The apparatus according to claim 25, wherein said implant device is dimensioned to be contained in the urethra.

28. The apparatus according to claim 27, wherein said housing comprises a tube.

29. The apparatus according to claim 25, wherein said screw and nut motion converter means comprises a screw and a nut, and wherein said nut is fixed in relation to said housing and said plug means is axially displaceable with respect to said outlet by rotation of said screw within said nut.

30. The apparatus according to claim 25, wherein said screw and nut motion converter means comprises a screw and a nut, and wherein said nut is axially displaceable by rotation of said screw, and said nut carries said plug means.

31. The apparatus according to claim 25, wherein said drive magnet and said driven magnet are each provided with more than two magnetic poles.

32. The apparatus according to claim 25, wherein said drive magnet and said driven magnet are different in size.

33. The apparatus according to claim 25, further comprising a pump having at least one stationary guide vane.

34. The apparatus according to claim 25, wherein said valve is provided with pressure-sensitive opening means to release urine through said valve at a predetermined pressure threshold.

35. A medical apparatus, comprising:

a drive magnet, externally located with respect to a subject'"'"'s body, having a first axis, and mounted on a first support means for supporting said drive magnet along said first axis for rotation about said first axis; and

,

a fluid pump dimensioned to be contained in a fluid carrying vessel of the subject'"'"'s body, said pump comprising a housing containing a driven magnet, an inlet and an outlet, said driven magnet having a second axis and being mounted on a second support means for supporting rotation of said driven magnet about said second axis by magnetic pole coupling with said drive magnet when said driven magnet is implanted in the subject'"'"'s body and said drive magnet is rotated sufficiently close to said driven magnet to be magnetically coupled thereto.

36. The apparatus according to claim 35, wherein said pump is dimensioned to be contained in the urethra.

37. The apparatus according to claim 36, further comprising a valve, said valve comprising a plug means, and a screw and nut motion converter means for axially displacing said plug means toward and away from said outlet, said screw and nut motion converter means being coupled to said plug means and to said second support means of said driven magnet so that said plug means is axially displaceable towards said outlet upon rotation of said driven magnet in a first direction and is axially displaceable away from said outlet upon rotation of said driven magnet in a second, opposite direction.

38. The apparatus according to claim 37, wherein said driven magnet is contained in a housing, and wherein said screw and nut motion converter means comprises a screw and a nut, said nut being fixed in relation to said housing and said plug means being axially displaceable with respect to said outlet by rotation of said screw within said nut.

39. The apparatus according to claim 37, wherein said screw and nut motion converter means comprises a screw and a nut, and wherein said nut is axially displaceable by rotation of said screw, and said nut carries said plug means.

40. The apparatus according to claim 37, wherein said valve is further provided with pressure-sensitive opening means to release urine through said valve at a predetermined pressure threshold.

41. The apparatus according to claim 37, wherein said pump is coupled to said valve by a coupling means for permitting said pump to continue pumping fluid even after said valve has been moved to its open position.

42. The apparatus according to claim 36, further comprising a valve, said valve comprising a housing containing said driven magnet;

a pivotal valve member having an open and a closed position, located at said outlet; and

a screw and nut motion converter connected to said valve member so as to pivot said valve member to said open position upon the rotation of said driven magnet in a first direction, and to pivot said valve member to said closed position, upon rotation of said driven magnet in the opposite direction.

43. The apparatus according to claim 42, wherein said valve is provided with pressure sensitive opening means to release urine through said valve at a predetermined pressure threshold.

44. The apparatus according to claim 42, wherein said pump is coupled to said valve by a coupling means for permitting said pump to continue pumping fluid even after said valve has been moved to an open position.

45. The apparatus according to claim 44, wherein said coupling means comprises a threaded nut and a partially threaded screw.

46. The apparatus according to claim 36, wherein said drive magnet and said driven magnet are each provided with more than two magnetic poles.

47. The apparatus according to claim 36, wherein said drive magnet and said driven magnet are different in size.

48. The apparatus according to claim 36, wherein said pump further comprises at least one stationary guide vane.

49. A medical apparatus, comprising:

a drive magnet, externally located with respect to a subject'"'"'s body, having a first axis and mounted on a first support means for supporting said drive magnet along said first axis for rotation about said first axis; and

,

a pump implantable in the subject'"'"'s body, said pump comprising a tubular housing containing a driven magnet;

said driven magnet having a second axis and being mounted on a second support means contained in said housing for supporting rotation of said driven magnet about said second axis by magnetic pole coupling with said drive magnet when said housing is implanted in the subject'"'"'s body and said drive magnet is rotated sufficiently close to said driven magnet to be magnetically coupled thereto; and

,

said pump comprising at least one impeller vane on the surface of said driven magnet to pump liquid through said housing upon rotation of said drive magnet.

50. The apparatus according to claim 49, wherein said housing is dimensioned to be contained in a fluid carrying vessel in the subject'"'"'s body.

51. The apparatus according to claim 49, wherein said housing is dimensioned to be contained in the urethra.

52. The apparatus according to claim 49, wherein said housing further comprises a valve.

53. The apparatus according to claim 52, wherein said valve comprises a fluid inlet and outlet for passage of fluid through said valve, a plug means, and a screw and nut motion converter means for axially displacing said plug means toward and away from said outlet, said screw and nut motion converter means connected to said plug means and to said second support means of said driven magnet so that said plug means is axially displaceable towards said outlet upon rotation of said driven magnet in a first direction and is axially displaceable away from said outlet upon rotation of said driven magnet in a second, opposite direction.

54. The apparatus according to claim 52, wherein said valve comprises a fluid inlet and outlet for passage of fluid through said valve, said valve further comprising a pivotal valve member having an open and a closed position and located at said outlet, and a screw and nut motion converter means connected to said valve member so as to pivot said valve member to said open position upon the rotation of said driven magnet in a first direction, and to pivot said valve member to said closed position upon rotation of said driven magnet in a second, opposite direction.

55. The apparatus according to claim 52, wherein said valve is provided with pressure-sensitive opening means to release urine through said valve at a predetermined pressure threshold.

56. The apparatus according to claim 52, wherein said pump is mechanically coupled to said valve by a coupling means which permits said pump to continue pumping fluid even after said valve has been moved to an open position.

57. The apparatus according to claim 56, wherein said coupling means comprises a threaded nut and a partially threaded screw.

58. A medical apparatus, comprising:

a drive magnet, externally located with respect to a subject'"'"'s body, having a first axis and mounted on a first support means for supporting said drive magnet along said first axis for rotation about said first axis; and

a pump comprising a housing dimensioned to be contained in a fluid carrying vessel in the subject'"'"'s body;

said housing containing a driven magnet, said driven magnet having a second axis and being mounted on a second support means in said housing for supporting rotation of said driven magnet about said second axis by magnetic pole coupling with said drive magnet when said driven magnet is implanted in the subject'"'"'s body and said drive magnet is rotated sufficiently close to said driven magnet to be magnetically coupled thereto; and

, said pump comprising at least one impeller vane on the surface of said driven magnet to pump liquid through said housing upon rotation of said drive magnet.

59. The apparatus according to claim 58, wherein said pump is configured and dimensioned to be contained in a fluid carrying vessel in the subject'"'"'s body for pumping fluid in said vessel upon rotation of said drive magnet.

60. The apparatus according to claim 59, wherein said fluid carrying vessel is the urethra.

61. The apparatus according to claim 60, wherein said housing further comprises a valve.

62. The apparatus according to claim 61, wherein said valve comprises a fluid inlet and outlet for passage of fluid through said valve, a plug means, and a screw and nut motion converter means for axially displacing said plug means toward and away from said outlet, said screw and nut motion converter means connected to said plug means and to said second support means of said driven magnet so that said plug means is axially displaceable towards said outlet upon rotation of said driven magnet in a first direction and is axially displaceable away from said outlet upon rotation of said driven magnet in a second, opposite direction.

63. The apparatus according to claim 61, wherein said valve comprises a fluid inlet and outlet for passage of fluid through said valve, said valve further comprising a pivotal valve member having an open and a closed position and located at said outlet, and a screw and nut motion converter means connected to said valve member so as to pivot said valve member to said open position upon the rotation of said driven magnet in a first direction, and to pivot said valve member to said closed position upon rotation of said driven magnet in a second, opposite direction.

64. The apparatus according to claim 61, wherein said valve is provided with pressure-sensitive opening means to release urine through said valve at a predetermined pressure threshold.

65. The apparatus according to claim 61, wherein said pump is mechanically coupled to said valve by a coupling means which permits said pump to continue pumping fluid even after said valve has been moved to an open position.

66. The apparatus according to claim 65, wherein said coupling means comprises a threaded nut and a partially threaded screw.

67. A medical apparatus, comprising:

a drive magnet, externally located with respect to a subject'"'"'s body, having a first axis and mounted on a first support means for supporting said drive magnet along said first axis for rotation about said first axis; and

a pump implantable in the subject'"'"'s body, said pump comprising a housing containing a driven magnet, said driven magnet having a second axis and being mounted on a second support means for supporting rotation of said driven magnet about said second axis by magnetic pole coupling with said drive magnet when said driven magnet is implanted in the subject'"'"'s body and said drive magnet is rotated sufficiently close to said driven magnet to be magnetically coupled thereto;

said pump comprising at least one impeller vane on the surface of said driven magnet to pump liquid through said housing upon rotation of said drive magnet, and further comprising at least one stationary guide vane.

68. The apparatus according to claim 67, wherein said pump is configured and dimensioned to be contained in a fluid carrying vessel in the subject'"'"'s body for pumping a fluid in said vessel upon rotation of said drive magnet.

69. The apparatus according to claim 68, wherein said fluid carrying vessel is the urethra.

70. The apparatus according to claim 69, wherein said housing further comprises a valve.

71. The apparatus according to claim 70, wherein said valve comprises a fluid inlet and outlet for passage of fluid through said valve, a plug means, and a screw and nut motion converter means for axially displacing said plug means toward and away from said outlet, said screw and nut motion converter means connected to said plug means and to said second support means of said driven magnet so that said plug means is axially displaceable towards said outlet upon rotation of said driven magnet in a first direction and is axially displaceable away from said outlet upon rotation of said driven magnet in a second, opposite direction.

72. The apparatus according to claim 70, wherein said valve comprises a fluid inlet and outlet for passage of fluid through said valve, said valve further comprising a pivotal valve member having an open and a closed position and located at said outlet, and a screw and nut motion converter means connected to said valve member so as to pivot said valve member to said open position upon the rotation of said driven magnet in a first direction, and to pivot said valve member to said closed position upon rotation of said driven magnet in a second, opposite direction.

73. The apparatus according to claim 70, wherein said valve is provided with pressure-sensitive opening means to release urine through said valve at a predetermined pressure threshold.

74. The apparatus according to claim 73, wherein said pump is mechanically coupled to said valve by a coupling means which permits said pump to continue pumping fluid even after said valve has been moved to an open position.

75. The apparatus according to claim 74, wherein said coupling means comprises a threaded nut and a partially threaded screw.

76. The apparatus according to claim 70, wherein said pump is mechanically coupled to said valve by a coupling means which permits said pump to continue pumping fluid even after said valve has been moved to an open position.