Implantable medical device and method of manufacture

• US 6,115,634 A
• Filed: 04/30/1997
• Issued: 09/05/2000
• Est. Priority Date: 04/30/1997
• Status: Expired due to Term

• Current Assignee: Michael J. Jaro
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Donders, Adrianus P., Wiklund, Craig, Weijand, Keon J., Ryan, Terence G.
• Primary Examiner(s): Getzow, Scott M.
• Application Number:
  US08/841,709
• Time in Patent Office: 1,224 Days
• Field of Search: 607/32, 607/30, 607/31, 607/9
• US Class Current: 607/32
• CPC Class Codes: A61N 1/37229 Shape or location of the implanted or external antenna
• CPC Class Codes: A61N 1/37512 Pacemakers
• CPC Class Codes: H01Q 1/273 Adaptation for carrying or wearing by persons or animals
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Abstract

An implantable medical device having a hermetic canister a battery positioned within the hermetic canister; a pulse generator system positioned within the hermetic canister and electrically coupled to the battery; a receiver positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system; a transmitter positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system; and an antenna positioned outside the hermetic canister and coupled to the pulse generator by a feedthrough. The antenna is constructed of a series of planar windings enclosed by an enclosure; each winding is between 1-100 microns wide, wherein each winding is between 1-1000 microns thick and wherein each winding is spaced apart from each of the other windings between 1-100 microns. In the preferred embodiment the antenna has a closely spaced concentric winding of a conductive material, preferably gold, the winding having 30 turns, wherein is conductive material 25 microns wide, 100 microns thick, and each winding is spaced apart from each of the other turns by 20 microns.

Claims

1. An implantable medical device, comprising:

an hermetic canister;

a battery positioned within the hermetic canister;

a pulse generator system positioned within the hermetic canister and electrically coupled to the battery;

a receiver positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system;

a transmitter positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system; and

an antenna positioned outside the hermetic canister and coupled to the pulse generator;

wherein the first winding is in the range of approximately 1-100 microns wide, in the range of approximately 1-1000 microns thick, the first winding has a series of between approximately 1-1000 turns spaced between approximately 1-50 microns apart.

2. An implantable medical device, comprising:

an hermetic canister;

a battery positioned within the hermetic canister;

a pulse generator system positioned within the hermetic canister and electrically coupled to the battery;

a receiver positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system;

a transmitter positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system; and

an antenna positioned outside the hermetic canister and coupled to the pulse generator, the antenna having a first winding of a conductive material, the first winding lying substantially in a first plane, the first winding comprising a first series of turns about a first axis, the first axis being perpendicular to the first plane;

wherein each winding has a cross sectional shape, the cross sectional shape being rectangular.

3. An implantable medical device, comprising:

an hermetic canister;

a battery positioned within the hermetic canister;

a pulse generator system positioned within the hermetic canister and electrically coupled to the battery;

a receiver positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system;

a transmitter positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system; and

an antenna positioned outside the hermetic canister and coupled to the pulse generator;

wherein the antenna has a first winding of a conductive material, the conductive material having a cross section, the cross section having an aspect ratio between the range of approximately 1;

1 to 1;

1000.

4. An implantable medical device, comprising:

an hermetic canister;

a battery positioned within the hermetic canister;

a pulse generator system positioned within the hermetic canister and electrically coupled to the battery;

a receiver positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system;

a transmitter positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system; and

an antenna positioned outside the hermetic canister and coupled to the pulse generator;

wherein the antenna has a first winding of a conductive material, the first winding lying substantially in a first plane, the first winding comprising a first series of turns about a first axis defining a first average aperture of the windings used in the antenna within the first plane, the first average aperture of the windings used in the antenna within the first plane having a first average aperture of the windings surface area which is greater than approximately 0.01 square inches.

5. An implantable medical device of claim 4 wherein the first average aperture of the windings surface area is equal to approximately 0.077 square inches.

6. An implantable medical device, comprising:

an hermetic canister;

a battery positioned within the hermetic canister;

a pulse generator system positioned within the hermetic canister and electrically coupled to the battery;

a receiver positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system;

a transmitter positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system; and

a first planar antenna and a second planar antenna positioned outside the hermetic canister, the first planar antenna being coupled to the pulse generator, the second planar antenna being electrically coupled to the first planar antenna, the second planar antenna being positioned outside the hermetic canister, a connector block being coupled to the hermetic enclosure, the first planar antenna and the second planar antenna being positioned within the connector block.

7. An implantable medical device, comprising:

an hermetic canister;

a battery positioned within the hermetic canister;

a pulse generator system positioned within the hermetic canister and electrically coupled to the battery;

a receiver positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system;

a transmitter positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system; and

a first planar antenna positioned outside the hermetic canisters the first planar antenna being coupled to the pulse generator;

wherein a connector block is coupled to the hermetic enclosure, the first planar antenna component having a first winding of a conductive material, the first winding comprising a first series of turns lying substantially in a first plane, the first series of turns defining a first average aperture of the windings, the first average aperture of the windings having a first surface area, the connector block having a connector block surface area within the first plane, the first surface area being equal to or greater than at least approximately 20% of the connector block surface area.

8. An implantable medical device of claim 7 wherein the average surface area of the aperture of the windings used in the antenna is equal to or greater than at least 20% of the surface area of the connector block.

9. An implantable medical device of claim 7 wherein the average surface area of the aperture of the windings used in the antenna is approximately equal to or greater than approximately 50% of the surface area of the connector block.

10. An implantable medical device, comprising:

an hermetic canister;

a battery positioned within the hermetic canister;

a pulse generator system positioned within the hermetic canister and electrically coupled to the battery;

a receiver positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system;

a transmitter positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system; and

a first planar antenna positioned outside the hermetic canister, the first planar antenna having a thickness and being coupled to the pulse generator, the antenna thickness being equal to or less than approximately 20% of the thickness of the device.

11. An implantable medical device comprising:

a hermetic canister;

a battery positioned within the hermetic canister;

a pulse generator system positioned within the hermetic canister and electrically coupled to the battery;

a receiver positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system;

a transmitter positioned within the hermetic canister and electrically coupled to the battery and the pulse generator system; and

an antenna coupled to the transmitter and the receiver, the antenna having a first winding of a conductive material, the first winding comprising a first series of turns lying substantially in a first plane, the first series of turns defining a first average aperture of the windings, the first average aperture of the windings having a first surface area, the first surface area greater than approximately 0.01 square inches.

12. An implantable medical device of claim 11 wherein the first surface area is greater than approximately 0.07 square inches.

13. An implantable medical device of claim 11 wherein the first surface area is greater than approximately 0.2 square inches.

14. An implantable medical device of claim 11 further comprising a connector block coupled to the hermetic canister, the connector block having a surface area in the first plane wherein the antenna is mounted to the connector block.

15. An implantable medical device of claim 11 wherein the surface area of the connector block within the first plane is approximately 0.557 square inches.

16. An implantable medical device of claim 11 wherein the ratio of the surface area of the connector block to the first surface area is no more than 2.159:

1.

17. An implantable medical device of claim 11 wherein the average surface area of the aperture of the windings used in the antenna is equal to or greater than at least approximately 20% of the surface area of the connector block.

18. An implantable medical device of claim 11 wherein the first surface area is at least equal to approximately 46% of the projected surface area of the connector block.

19. An implantable medical device of claim 18 wherein the thickness of antenna is no more than approximately 3.85% of the thickness of the canister of the device.

20. An implantable medical device of claim 11 wherein the antenna has a thickness in a first direction, the hermetic canister has a thickness in the first direction wherein the thickness of the antenna is equal to or less than approximately 20% of the thickness of the canister.

21. An implantable medical device of claim 20 wherein the thickness of the antenna would be no more than approximately 12.62% of the thickness of the canister of the device.

22. An implantable medical device of claim 11 wherein the windings used in the antenna have a thickness no more than approximately 1000 microns.

23. An implantable medical device of claim 11 wherein the antenna is positioned within the connector block.

24. An implantable medical device of claim 11 wherein the ratio of antenna thickness to canister thickness is between approximately 1:

15 and 1;

1000 and the ratio of thickness of the windings used in the antenna to the canister thickness is between approximately 1;

7.8 and 1;

7800.

25. An implantable medical device of claim 24 wherein the antenna is constructed from an enclosure which has mounted within a first winding.

26. An implantable medical device of claim 25 wherein the enclosure is polycarbonate or polyester or polyurethane or epoxy.

27. An implantable medical device of claim 26 wherein the enclosure is medical adhesive and the conductive material is copper or niobium or platinum.

28. An implantable medical device of claim 11 wherein the conductive material is gold.

29. An implantable medical device of claim 11 wherein the antenna has a first winding having a series of approximately 30 turns.

30. An implantable medical device of claim 11 wherein the first winding is between approximately 1-100 microns wide.

31. An implantable medical device of claim 30 wherein the first winding is approximately 25 microns wide.

32. An implantable medical device of claim 11 wherein the first winding is between approximately 1-1000 microns thick.

33. An implantable medical device of claim 32 wherein the first winding is approximately 100 microns thick.

34. An implantable medical device of claim 11 wherein the turns within the first winding are spaced apart between approximately 1-100 microns.

35. An implantable medical device of claim 34 wherein the turns within the first winding are spaced apart approximately 20 microns.

36. An implantable medical device of claim 11 wherein the first winding has an aspect ratio between approximately 1-1000:

1.

37. An implantable medical device of claim 36 wherein the first winding has an aspect ratio between 1:

1 and 10;

1.

38. An implantable medical device of claim 11 wherein the first winding is rectangular in cross section.

39. An implantable medical device of claim 11 wherein the first winding is mounted within an enclosure having a thickness of between approximately 100-1500 microns.

40. An implantable medical device of claim 39 wherein the enclosure of the antenna is approximately 300 microns thick.

41. An implantable medical device of claim 11 wherein the total thickness of the enclosure and windings is no more than approximately 1500 microns.

42. An implantable medical device of claim 11 wherein the thickness of the windings used in the antenna is no more than 100 microns while the canister has a thickness of approximately 0.312 inches.

43. An implantable medical device of claim 11 wherein the ratio of the thickness of the canister to the thickness of the windings used in the antenna is approximately 78.

44. An implantable medical device of claim 11 wherein the thickness of the windings used in the antenna is no more than approximately 1.28% of the thickness of the canister of the device.

45. A method of manufacturing an implantable medical device, comprising:

providing an hermetic canister;

positioning a battery within the hermetic canister;

positioning a pulse generator system within the hermetic canister and electrically coupling the pulse generator to the battery;

positioning a receiver within the hermetic canister and electrically coupling the receiver to the battery and the pulse generator system;

positioning a transmitter within the hermetic canister and electrically coupling the transmitter to the battery and the pulse generator system; and

mounting a feedthrough through the hermetic canister such that a first end thereof is disposed within the hermetic canister and is electrically coupled to the transmitter and to the receiver, and such that a second end thereof is disposed outside the hermetic canister

providing a planar first antenna

mounting the first antenna outside the hermetic canister to the second end of the feedthrough;

wherein the step of providing the first antenna comprises providing a plurality of closely spaced concentric windings of a conductive material therefor, each winding being in the range of approximately 1-100 microns wide and spaced between approximately 1-50 microns apart.

46. The method of manufacturing an implantable medical device of claim 45, further comprising the steps of providing a planar second antenna, coupling the second antenna to the first antenna, and mounting the first antenna outside the hermetic canister to the second end of the feedthrough.

47. A method of manufacturing an implantable medical device, comprising:

providing an hermetic canister;

positioning a battery within the hermetic canister;

positioning a pulse generator system within the hermetic canister and electrically coupling the pulse generator to the battery;

positioning a receiver within the hermetic canister and electrically coupling the receiver to the battery and the pulse generator system;

positioning a transmitter within the hermetic canister and electrically coupling the transmitter in the battery and the pulse generator system; and

mounting a feedthrough through the hermetic canister such that a first end thereof is disposed within the hermetic canister and is electrically coupled to the transmitter and to the receiver, and such that a second end thereof is disposed outside the hermetic canister

providing a planar first antenna

mounting the first antenna outside the hermetic canister to the second end of the feedthrough;

wherein the step of providing the first antenna comprises providing an average surface area of the aperture of the windings used in the first antenna of approximately 0.25 square inches.

48. A method of manufacturing an implantable medical device, comprising:

providing an hermetic canister;

positioning a battery within the hermetic canister;

positioning a pulse generator system within the hermetic canister and electrically coupling the pulse generator to the battery;

positioning a receiver within the hermetic canister and electrically coupling the receiver to the battery and the pulse generator system;

positioning a transmitter within the hermetic canister and electrically coupling the transmitter to the battery and the pulse generator system; and

mounting a feedthrough through the hermetic canister such that a first end thereof is disposed within the hermetic canister and is electrically coupled to the transmitter and to the receiver, and such that a second end thereof is disposed outside the hermetic canister

providing a planar first antenna

mounting the first antenna outside the hermetic canister to the second end of the feedthrough;

wherein the step of providing the first antenna further comprises the steps of;

providing a photo resist material onto a substrate;

placing a mask having apertures over the photo resist material;

transmitting X rays from a device above the mask passes through the apertures to weaken areas of the photo resist bombarded by the X-rays;

removing the weakened areas of the photo resist to create free standing structures of photoresist material;

depositing a material over the free standing photoresist structures;

removing the freestanding photo resist structures;

enclosing the freestanding plated structures within an enclosure; and

removing the substrate.

49. The method of manufacturing an implantable medical device of claim 48, further comprising the step of removing excess portions of the material so that the freestanding photo resist structures have a height equal to the material deposited in between.