Position sensitive power transfer antenna

• US 5,314,453 A
• Filed: 12/06/1991
• Issued: 05/24/1994
• Est. Priority Date: 12/06/1991
• Status: Expired due to Term

• Current Assignee: Spinal Cord Society
• Original Assignee: Spinal Cord Society
• Inventors: Jeutter, Dean C.
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): SCHAETZLE, KENNEDY
• Application Number:
  US07/803,022
• Time in Patent Office: 900 Days
• Field of Search: 128/419 R, 128/419 PS, 128/419 PT, 128/899, 128/421, 128/903, 600/12, 600/13, 607/30, 607/31, 607/32, 607/33, 607/60, 607/61, 607/2
• US Class Current: 607/61
• CPC Class Codes: A61N 1/37217 characterised by the communication link, e.g. acoustic or tactile
• CPC Class Codes: A61N 1/37223 Circuits for electromagnetic coupling
• CPC Class Codes: A61N 1/3787 from an external energy source

Abstract

A power supply implanted behind a tissue barrier in a human body and operating a medical device and incorporating a high frequency power receiver antenna coil; a transmitter having a high frequency transmitter antenna coil generating high frequency power and transmitting the power from the transmitting coil to the implanted receiver coil; an implanted non-ferrous magnet affixed within the implanted annular receiver coil; and a magnetic field sensing device or magnetically operated reed switch affixed concentrically within the transmitter coil of the transmitter and controlling transmission of high frequency power from the transmitter to the implanted power supply.

Claims

1. A high frequency transmitting and receiving device wherein a high frequency signal is generated by an external transmitter with a transmitter antenna coil, and the signal is transmitted between the transmitter antenna coil and a receiver coil wherein the receiver coil is implantable behind a tissue barrier, the device comprising:

a disseminating means adjacent the receiver coil for exuding a sensible media capable of passing through such a tissue barrier and distinguishable from the high frequency signal being transmitted;

and a sensing means adjacent the transmitter antenna coils for detecting said sensible media and for determining the proximity of the disseminating portion and therefore the relative proximity of the coils, the sensing means comprised of a switch means connected to the transmitter for alternately enabling and disabling the transmitter in correspondence to the relative proximity of the coils.

2. A high frequency transmitting and receiving device according to claim 1 wherein the sensible media comprises a magnetic field.

3. A high frequency transmitting and receiving device according to claim 2 wherein said magnetic field is a substantially non-varying field.

4. A high frequency transmitting and receiving device according to claim 1 wherein said disseminating portion comprises a non-ferrous magnet.

5. A high frequency transmitting and receiving device according to claim 1 wherein said disseminating means and said sensing means have fixed physical relationships with the respective coils.

6. A high frequency transmitting and receiving device according to claim 5 wherein the transmitter antenna coil and receiver coil are substantially annular in shape.

7. A high frequency transmitting and receiving device according to claim 6 wherein said disseminating and sensing means are located substantially concentrically of said coils.

8. A high frequency transmitting and receiving device according to claim 6 wherein the disseminating portion comprises a magnet with a pole face oriented to arrange the magnetic field substantially concentrically of the transmitting coil whereby the direction that the magnetic field is arranged varies corresponding to the orientation of the receiver coil.

9. A high frequency transmitting and receiving device according to claim 8 wherein said switch means is magnetically operated and is operationally responsive to alternate alignment and misalignment with the magnetic field, and wherein such misalignment maybe axial, lateral and angular.

12. A high frequency transmitting and receiving device according to claim 6 wherein the disseminating portion comprises a non-ferrous magnet located concentrically within the receiver coil, the receiver coil and magnet implantable behind the tissue barrier.

13. A high frequency transmitting and receiving device according to claim 12 wherein the indicator means includes an audio signal when the transmitter is disabled and therefore when the coils are misaligned.

18. The high frequency transmitting and receiving device according to claim 12 wherein the indicator means includes a light emitting diode to indicate when the transmitter is enabled and therefore when the coils are aligned.

10. A high frequency transmitting and receiving device wherein the switch means operates to disable the transmitter when misalignment is sensed and operates to enable the transmitter when alignment is sensed.

11. A high frequency transmitting and receiving device according to claim 10 further comprising an indicator means connected to the transmitter for indicating alternately when the transmitter is disabled and when it is enabled.

14. A radio frequency transmitting and receiving device comprising a power receiver implantable in a human body behind a tissue barrier for powering an implantable medical device, the power receiver comprising an implantable annular radio frequency receiver coil, said transmitting and receiving device also comprising a transmitter to be variably placed adjacent the tissue barrier and effecting a transmission of radio frequency power to the receiver coil, the transmitter comprising an annular radio frequency transmitter coil to be placed in alignment with the receiver coil, the improvement comprising a permanent non-ferrous magnet implantable with and fixed concentrically within the annular receiver coil, and comprising a magnetic field sensing means located concentrically within the annular transmitter coil for responding to alternate alignment and misalignment with the magnet for indicating when proper position of the transmitter coil has been achieved, the sensing means including a switching means for enabling the transmitter when alignment is sensed and disabling the transmitter when misalignment is sensed.

15. A method of nearly maximizing high frequency signal transmission from a transmitter between a high frequency receiver coil which is implanted behind a tissue barrier and a high frequency transmitter antenna coil connected to the transmitter and variably placed adjacent the tissue barrier, comprising:

implanting a disseminating portion adjacent the transmitter antenna coil and in a predetermined fixed relation with the transmitter antenna coil, the disseminating portion exuding a sensible media being capable of passing through the tissue barrier and being distinguishable from the high frequency power being transmitted,

placing a sensing portion adjacent the receiver coil and in a predetermined fixed relation with the receiver coil, the sensing portion sensing the strength of said media and controlling the transmission of high frequency power in response to varying strengths of media passed thereto by enabling and disabling the transmitter,

and physically adjusting the placement of said transmitter coil and the disseminating portion in fixed relation thereto relative to the receiver coil and the sensing portion until nearly maximum strength of media is sensed whereby the high frequency transmission between the coils is nearly maximized.

16. The method of claim 15 wherein said placing of the disseminating portion comprises implanting the disseminating portion with the implanted receiving coil.

17. The method claim 15 wherein said placing of the disseminating portion comprises a non-ferrous magnet.