Magnetically shielded AIMD housing with window for magnetically actuated switch
View Patent ↗An active implantable medical device (AIMD) having a magnetic shield on its housing for shielding the interior of the device from magnetic fields originating outside the housing. The magnetic shield is created using a magnetic absorbing coating on the inner surface of the housing. The AIMD includes an area of the housing left without the magnetic shield, a magnetic window, adjacent to a magnetically actuated device located inside of the housing. The magnetic window permits activation of the magnetically actuated device.
1. An active implantable medical device, comprising:
a housing having a terminal through which a lead wire extends;
a magnetically actuated device disposed within the housing; and
a magnetic shield disposed adjacent to the housing for shielding an interior of the housing from magnetic fields originating exteriorly of the housing, the magnetic shield including a window adjacent to the magnetically actuated device, and wherein the magnetic shield comprises a coating applied to interior surfaces of the housing.
2. The active implantable medical device of claim 1 , wherein the coating comprises ferrous paint, nickel plating, nickel coating, nano-materials, Mu-metal materials, or a sogel or slurry of nano-materials containing magnetic dipoles.
3. The active implantable medical device of claim 1 , wherein the magnetically actuated device is a reed switch, a Hall-effect device, an embedded telemetry coil, a low frequency telemetry coil, or a close-coupled subcutaneous battery recharging circuit.
4. The active implantable medical device of claim 1 , including a sub-housing for the magnetically actuated device, the sub-housing overlaying the magnetic shield window so that the magnetically actuated device is disposed between the window and the sub-housing.
5. The active implantable medical device of claim 4 , including a secondary magnetic shield disposed adjacent to the sub-housing.
6. The active implantable medical device of claim 5 , wherein the secondary magnetic shield comprises a coating applied to interior surfaces of the sub-housing.
7. The active implantable medical device of claim 6 , wherein the secondary magnetic shield coating comprises ferrous paint, nickel plating, nickel coating, nano-materials, Mu-metal materials, or a sogel or slurry of nano-materials containing magnetic dipoles.
8. The active implantable medical device of claim 4 , wherein the sub-housing comprises an electrical shield.
9. The active implantable medical device of claim 1 , wherein the terminal comprises an insulator through which the lead wire extends, and a terminal magnetic shield.
10. The active implantable medical device of claim 9 , wherein the terminal magnetic shield comprises non-magnetic electrodes within the insulator.
11. The active implantable medical device of claim 10 , wherein the non-magnetic electrodes comprise nickel electrodes.
12. The active implantable medical device of claim 1 , wherein the housing comprises an electrical shield.
13. The active implantable medical device of claim 12 , wherein the electrical shield comprises titanium.
14. The active implantable medical device of claim 1 , wherein the AIMD comprises a cardiac pacemaker, an implantable defibrillator, a congestive heart failure device, a hearing implant, a cochlear implant, a neurostimulator, a drug pump, a ventricular assist device, an insulin pump, a spinal cord stimulator, an implantable sensing system, a deep brain stimulator, an artificial heart, an incontinence device, a vagus nerve stimulator, a bone growth stimulator, a gastric pacemaker, or a prosthetic device.
15. An active implantable medical device, comprising:
a housing having a terminal through which a lead wire extends, wherein the housing comprises an electrical shield;
a magnetically actuated device disposed within the housing;
a magnetic shield disposed adjacent to the housing for shielding an interior of the housing from magnetic fields originating exteriorly of the housing, the magnetic shield including a window adjacent to the magnetically actuated device;
a sub-housing for the magnetically actuated device, the sub-housing overlaying the magnetic shield window so that the magnetically actuated device is disposed between the window and the sub-housing; and
a secondary magnetic shield disposed adjacent to the sub-housing.
16. The active implantable medical device of claim 15 , wherein the magnetic shield and the secondary magnetic shield comprise coatings applied to interior surfaces of the housing and the sub-housing.
17. The active implantable medical device of claim 16 , wherein the coatings comprise ferrous paint, nickel plating, nickel coating, nano-materials, Mu-metal materials, or a sogel or slurry of nano-materials containing magnetic dipoles.
18. The active implantable medical device of claim 16 , wherein the magnetically actuated device is a reed switch, a Hall-effect device, an embedded telemetry coil, a low frequency telemetry coil, or a close-coupled subcutaneous battery recharging circuit.
19. The active implantable medical device of claim 15 , wherein the terminal comprises an insulator through which the lead wire extends, and a terminal magnetic shield.
20. The active implantable medical device of claim 19 , wherein the terminal magnetic shield comprises non-magnetic electrodes within the insulator.
21. The active implantable medical device of claim 20 , wherein the non-magnetic electrodes comprise nickel electrodes.
22. The active implantable medical device of claim 15 , wherein the sub-housing comprises an electrical shield.
23. The active implantable medical device of claim 22 , wherein the electrical shields comprise titanium.
24. The active implantable medical device of claim 15 , wherein the AIMD comprises a cardiac pacemaker, an implantable defibrillator, a congestive heart failure device, a hearing implant, a cochlear implant, a neurostimulator, a drug pump, a ventricular assist device, an insulin pump, a spinal cord stimulator, an implantable sensing system, a deep brain stimulator, an artificial heart, an incontinence device, a vagus nerve stimulator, a bone growth stimulator, a gastric pacemaker, or a prosthetic device.
25. An active implantable medical device, comprising:
a housing having a terminal insulator through which a lead wire extends, and a terminal magnetic shield;
a magnetically actuated device disposed within the housing;
a magnetic shield disposed adjacent to the housing for shielding an interior of the housing from magnetic fields originating exteriorly of the housing, the magnetic shield including a window adjacent to the magnetically actuated device;
a sub-housing for the magnetically actuated device, the sub-housing overlaying the magnetic shield window so that the magnetically actuated device is disposed between the window and the sub-housing; and
a secondary magnetic shield disposed adjacent to the sub-housing.
26. The active implantable medical device of claim 25 , wherein the AIMD comprises a cardiac pacemaker, an implantable defibrillator, a congestive heart failure device, a hearing implant, a cochlear implant, a neurostimulator, a drug pump, a ventricular assist device, an insulin pump, a spinal cord stimulator, an implantable sensing system, a deep brain stimulator, an artificial heart, an incontinence device, a vagus nerve stimulator, a bone growth stimulator, a gastric pacemaker, or a prosthetic device.
27. The active implantable medical device of claim 26 , wherein the magnetic shield and the secondary magnetic shield comprise coatings applied to interior surfaces of the housing and the sub-housing.
28. The active implantable medical device of claim 27 , wherein the coatings comprise ferrous paint, nickel plating, nickel coating, nano-materials, Mu-metal materials, or a sogel or slurry of nano-materials containing magnetic dipoles.
29. The active implantable medical device of claim 26 , wherein the magnetically actuated device is a reed switch, a Hall-effect device, an embedded telemetry coil, a low frequency telemetry coil, or a close-coupled subcutaneous battery recharging circuit.
30. The active implantable medical device of claim 25 , wherein the terminal magnetic shield comprises non-magnetic electrodes within the insulator.
31. The active implantable medical device of claim 30 , wherein the non-magnetic electrodes comprise nickel electrodes.
32. The active implantable medical device of claim 31 , wherein the electrical shield comprises titanium.
33. The active implantable medical device of claim 25 , wherein the housing and the sub-housing both comprise an electrical shield.