Components for reducing image distortion

• US 7,684,860 B2
• Filed: 03/23/2007
• Issued: 03/23/2010
• Est. Priority Date: 03/24/2006
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Conroy, Mark J., Scott, Erik R., Wahlstrand, Carl D., Kast, John
• Primary Examiner(s): Layno; Carl H
• Assistant Examiner(s): Stice; Paula J
• Application Number:
  US11/728,028
• Publication Number:
  US 20070233195A1
• Time in Patent Office: 1,096 Days
• Field of Search: 607/36, 607/122, 607 1- 2, 604/175, 604/288.04, 604/244, 604/283, 424/423, 128/419, 128/654, 174/35, 600/410, 600/433, 600/420, 600/9.3
• US Class Current: 607/2
• 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 and a circuit board provided within the housing. The circuit board includes a plurality of electronic components electrically coupled thereto. At least one non-functional component is provided on the circuit board and formed from a material that has an electromagnetic permeability configured to reduce the amount of image distortion caused by at least one of the plurality of electronic components when the device is subject to a magnetic field during an MRI scan.

Claims

1. An implantable medical device comprising:

a housing;

a circuit board provided within the housing, the circuit board comprising a plurality of electronic components electrically coupled thereto; and

at least one non-functional component provided on the circuit board and formed from a material that has an electromagnetic permeability configured to reduce the amount of image distortion caused by at least one of the plurality of electronic components when the device is subject to a magnetic field during an MRI scan.

2. The implantable medical device of claim 1, wherein the at least one non-functional component comprises a material selected from the group consisting of titanium and titanium alloys.

3. The implantable medical device of claim 1, wherein the at least one non-functional component comprises a material selected from the group consisting of palladium, platinum, silver, copper, manganese, aluminum, and alloys and combinations thereof.

4. The implantable medical device of claim 1, wherein the at least one non-functional component comprises a diamagnetic material and is positioned adjacent an electronic component comprising a paramagnetic material.

5. The implantable medical device of claim 1, wherein the at least one non-functional component comprises a paramagnetic material and is positioned adjacent an electronic component comprising a diamagnetic material.

6. The implantable medical device of claim 1, further comprising a plurality of non-functional components provided on the circuit board.

7. The implantable medical device of claim 1, wherein circuit board includes a first surface and a second surface oppositely disposed relative to the first surface and at least one of the plurality of dummy components is provided on the first surface and at least one of the plurality of dummy components is provided on the second surface.

8. The implantable medical device of claim 1, wherein the housing comprises a coating provided on at least a portion thereof, the coating comprising a material selected from the group consisting of palladium, platinum, silver, copper, manganese, aluminum, and alloys and combinations thereof.

9. The implantable medical device of claim 8, wherein the coating is provided on an interior surface of the housing.

10. The implantable medical device of claim 1, further comprising a potting material provided within the housing for reducing MRI image distortion.

11. The implantable medical device of claim 1, wherein the implantable medical device is a neurological stimulation device.

12. The implantable medical device of claim 1, wherein the implantable medical device is selected from the group consisting of 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.

13. An implantable medical device comprising:

a circuit board comprising a plurality of electronic components and a plurality of dummy components, wherein the dummy components are configured to mitigate MRI image distortion caused by at least one of the plurality of electronic components; and

at least one of the plurality of dummy components is provided proximate an electronic component on the circuit board that is relatively paramagnetic.

14. The implantable medical device of claim 13, wherein at least one of the plurality of dummy components comprises a material selected from the group consisting of titanium and titanium alloys.

15. The implantable medical device of claim 13, wherein at least one of the plurality of dummy components comprises a material selected from the group consisting of palladium, platinum, silver, copper, manganese, aluminum, and alloys and combinations thereof.

16. The implantable medical device of claim 13, further comprising a housing having a material provided in contact therewith comprising a material selected from the group consisting of titanium, palladium, platinum, silver, copper, manganese, aluminum, and alloys and combinations thereof.