Implantable medical device

• US 8,548,591 B2
• Filed: 02/16/2012
• Issued: 10/01/2013
• Est. Priority Date: 03/24/2006
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Kast, John, Wahlstrand, Carl D., Conroy, Mark J., Scott, Erik R.
• Primary Examiner(s): Layno, Carl H
• Assistant Examiner(s): Stice, Paula J
• Application Number:
  US13/398,588
• Publication Number:
  US 20120209352A1
• Time in Patent Office: 593 Days
• Field of Search: 607/36
• US Class Current: 607/35
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61N 1/05 for implantation or insertion into the body, e.g. heart electrode A61N1/06 takes precedence
• CPC Class Codes: A61N 1/0529 Electrodes for brain stimulation
• CPC Class Codes: A61N 1/0551 Spinal or peripheral nerve electrodes
• CPC Class Codes: A61N 1/086 Magnetic resonance imaging [MRI] compatible leads
• CPC Class Codes: A61N 1/3605 Implantable neurostimulators for stimulating central or peripheral nerve system
• CPC Class Codes: A61N 1/36125 Details of circuitry or electric components
• CPC Class Codes: A61N 1/3718 Monitoring of or protection against external electromagnetic fields or currents
• CPC Class Codes: A61N 1/37514 Brain implants
• CPC Class Codes: A61N 1/3758 Packaging of the components within the casing
• CPC Class Codes: A61N 1/378 Electrical supply
• CPC Class Codes: G01R 33/3875 using correction coil assemblies, e.g. active shimming
• CPC Class Codes: G01R 33/56572 caused by a distortion of a gradient magnetic field, e.g. non-linearity of a gradient magnetic field G01R33/56509, G01R33/56518, G01R33/56536 take precedence
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 50/103 prismatic or rectangular H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H01M 50/119 : Metals
• CPC Class Codes: H01M 50/121 : Organic material
• CPC Class Codes: H01M 50/122 : Composite material consisting of a mixture of organic and inorganic materials
• CPC Class Codes: H01M 50/14 : for protecting against damage caused by external factors
• CPC Class Codes: H01M 50/147 : Lids or covers
• CPC Class Codes: H01M 50/528 : Fixed electrical connections, i.e. not intended for disconnection
• CPC Class Codes: H01M 50/553 : Terminals adapted for prismatic, pouch or rectangular cells
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49 : Method of mechanical manufacture
• CPC Class Codes: Y10T 29/49002 : Electrical device making

Abstract

An implantable medical device includes a housing having a coating selectively provided on only a portion of the housing and a plurality of electronic components provided within an interior space defined by the housing. A first of the electronic components is a charging or telemetry coil and a second of the electronic components is a circuit board. The coating is provided on the housing in a first region near a component of the circuit board and is not provided on the housing in a second region near the charging or telemetry coil. The coating has a magnetic permeability suitable to and is provided in an amount effective to reduce MRI image distortion caused by the component of the circuit board.

Claims

1. An implantable medical device comprising:

a housing having a coating selectively provided on only a portion of the housing; and

a plurality of electronic components provided within an interior space defined by the housing, wherein a first of the electronic components is a charging or telemetry coil and a second of the electronic components is a circuit board;

wherein the coating is provided on the housing in a first region near a component of the circuit board and is not provided on the housing in a second region near the charging or telemetry coil;

wherein the coating has a magnetic permeability and is provided in an amount configured to reduce MRI image distortion caused by the component of the circuit board.

2. The implantable medical device of claim 1, wherein the coating provided on the housing in the first region is provided in contact with an interior surface of the housing.

3. The implantable medical device of claim 1, wherein the coating provided on the housing in the first region is provided in contact with an exterior surface of the housing.

4. The implantable medical device of claim 1, wherein the coating is provided on the housing in the first region is a material selected from the group consisting of titanium and titanium alloys.

5. The implantable medical device of claim 1, wherein the coating is provided on the housing in the first region is a material selected from the group consisting of palladium, platinum, silver, copper, manganese, aluminum, and alloys and combinations thereof.

6. The implantable medical device of claim 1, further comprising a coating provided on the housing in a second region separate from the first region in an amount effective to reduce MRI image distortion caused by the implantable medical device, wherein the coating provided on the housing in the second region is provided at a thickness that differs from that on the first region.

7. The implantable medical device of claim 1, further comprising a coating provided on the housing in a second region separate from the first region in an amount effective to reduce MRI image distortion caused by the implantable medical device, wherein the coating provided on the housing in the first region is provided on an interior surface of the housing and the coating provided on the housing in the second region is provided on an exterior surface of the housing.

8. The implantable medical device of claim 1, further comprising a potting material within the housing that comprises at least one of a paramagnetic material or a diamagnetic material incorporated into a matrix comprising at least one of an epoxy or a silicon rubber material.

9. The implantable medical device of claim 1, further comprising at least one member coupled to an exterior surface of the housing in a location intended to selectively reduce MRI image distortion caused by a component of the implantable medical device, wherein the member is formed of a material selected from the group consisting of titanium, palladium, platinum, silver, copper, manganese, aluminum, and alloys and combinations thereof.

10. The implantable medical device of claim 1, wherein the implantable medical device is selected from the group consisting of a neurological stimulation device, a defibrillator, a pacemaker, a cardioverter, a cardiac contractility modulator, a drug administration device, a cochlear implant, a hearing aid, a sensor, a telemetry device, and a diagnostic recorder.

11. The implantable medical device of claim 1, wherein the implantable medical device an aggregate relative magnetic permeability that is closer to a relative magnetic permeability of water than without the coating.

12. The implantable medical device of claim 1, wherein one of the coating and the component of the circuit board is diamagnetic, and the other of the coating and the component of the circuit board is paramagnetic.

13. An implantable medical device comprising:

a housing;

a plurality of electronic components provided within the housing;

a coating provided on only a portion of a surface of the housing, wherein the surface includes a first region that has the coating provided thereon and a second region that does not have the coating provided thereon;

wherein the first region is near at least one electronic component of the plurality of electronic components, and the coating is provided in an amount configured to reduce MRI image distortion caused by the at least one electronic component.

14. The implantable medical device of claim 13, wherein the second region is near a charging or telemetry coil.

15. The implantable medical device of claim 13, wherein the at least one electronic component is a battery.

16. The implantable medical device of claim 13, wherein the at least one electronic component is a circuit board.

17. The implantable medical device of claim 13, wherein the coating provided on the housing in the first region is provided in contact with an interior surface of the housing.

18. The implantable medical device of claim 13, wherein the provided on the housing in the first region is a material selected from the group consisting of titanium, palladium, platinum, silver, copper, manganese, aluminum, and alloys and combinations thereof.

19. The implantable medical device of claim 13, wherein the surface has a third region having a coating provided thereon at a different thickness than the coating provided in the first region.

20. The implantable medical device of claim 13, wherein the implantable medical device is selected from the group consisting of a neurological stimulation device, a defibrillator, a pacemaker, a cardioverter, a cardiac contractility modulator, a drug administration device, a cochlear implant, a hearing aid, a sensor, a telemetry device, and a diagnostic recorder.

21. A method of producing a housing for an implantable medical device comprising:

disposing a coating material on only a portion of a surface of a housing; and

disposing an electronic component in the housing such that the electronic component is aligned with the portion of the surface of the housing having the coating material provided thereon, wherein the coating material is provided in an amount configured to reduce MRI image distortion caused by the electronic component.

22. The method of claim 21, wherein the coating material is selected from the group consisting of titanium, palladium, platinum, silver, copper, manganese, aluminum, and alloys and combinations thereof, and further comprising disposing a coil in the housing such that the coil is not aligned with the coating material.

23. The method of claim 21, further comprising determining an aggregate magnetic permeability of a prototype of the implantable medical device before and after disposing a coating material on only a portion of a surface of a housing.

24. The method of claim 23, wherein determining an aggregate relative magnetic permeability of a prototype of the implantable medical device includes viewing a field perturbation in a magnetic field of the prototype of the implantable medical device.