POWER SUPPLY FOR A RETINA IMPLANT

• US 20110060410A1
• Filed: 03/20/2008
• Published: 03/10/2011
• Est. Priority Date: 03/20/2008
• Status: Active Grant

• Current Assignee: Pixium Vision SA
• Original Assignee: Pixium Vision SA
• Inventors: Tiedtke, Hans-Jürgen, Rath, Alexander
• Granted Patent: US 9,079,042 B2
• Time in Patent Office: Days
• US Class Current: 623/6.63
• CPC Class Codes: A61F 9/08 Devices or methods enabling eye-patients to replace direct visual perception by another kind of perception
• CPC Class Codes: A61N 1/36046 of the eye
• CPC Class Codes: A61N 1/3787 from an external energy source

Abstract

A power supply for a retina implant at least partly located in the interior of a patient'"'"'s eye is described. The power supply comprises a first transmission coil (4, 23), a second transmission coil (5, 24). The power supply further comprises a signal generation unit adapted for generating a first high frequency signal and a second high frequency signal, and for applying the first high frequency signal to the first transmission coil and the second high frequency signal to the second transmission coil, the second high frequency signal being phase shifted relative to the first high frequency signal. The first transmission coil is adapted for transmitting the first high frequency signal, and the second transmission coil is adapted for transmitting the second high frequency signal.

Claims

1. A power supply for a retina implant at least partly located in the interior of a patient'"'"'s eye, the power supply comprising

a first transmission coil;

a second transmission coil;

a signal generation unit adapted for generating a first high frequency signal and a second high frequency signal, and for applying the first high frequency signal to the first transmission coil and the second high frequency signal to the second transmission coil, the second high frequency signal being phase shifted relative to the first high frequency signal;

wherein the first transmission coil is adapted for transmitting the first high frequency signal, and wherein the second transmission coil is adapted for transmitting the second high frequency signal.

2. The power supply of claim 1, further comprising at least one of:

the first and the second transmission coil are oriented at a predefined angle relative to one another;

the first and the second transmission coil are oriented at an angle between 70° and

120°

relative to one another;

the phase shift of the second high frequency signal relative to the first high frequency signal lies in the range between −

120° and

+120°

;

the frequency of the first high frequency signal is substantially equal to the frequency of the second high frequency signal;

the frequency of the first high frequency signal and the second high frequency signal is in the range between 100 kHz and 100 MHz.

3. The power supply of claim 1, wherein the signal generation unit comprises

a signal generator adapted for generating a high frequency signal;

a phase shifter adapted for converting the high frequency signal into the first high frequency signal and the second high frequency signal, the second high frequency signal being phase shifted relative to the first high frequency signal.

4. The power supply of claim 1, further comprising at least one amplifier adapted for amplifying the first high frequency signal and the second high frequency signal before supplying the first and the second high frequency signal to the first and the second transmission coil, respectively.

5. The power supply of claim 1, comprising a first amplifier adapted for amplifying the first high frequency signal and a second amplifier adapted for amplifying the second high frequency signal.

6. The power supply of claim 1, further comprising further transmission coils, wherein the signal generation unit is adapted for generating, in addition to the first and the second high frequency signal, further high frequency signals, and for applying the further high frequency signals to the further transmission coils.

7. The power supply of claim 1, further comprising an eyeglass frame, with both the first transmission coil and the second transmission coil being integrated in the eyeglass frame.

8. The power supply of claim 7, wherein the first transmission coil is arranged around one of the eyeglasses of the eyeglass frame.

9. The power supply of claim 7, wherein the second transmission coil is integrated into one of the temples of the eyeglass frame.

10. A visual prosthesis system comprising

a power supply according to claim 1;

a retina implant at least partly located in the interior of a patient'"'"'s eye, the retina implant comprising a receiver coil;

wherein the receiver coil is adapted for receiving a superposed high frequency signal transmitted by the first transmission coil and the second transmission coil.

11. The visual prosthesis system of claim 10, wherein the superposed high frequency signal comprises a first signal component transmitted by the first transmission coil and a second signal component transmitted by the second transmission coil.

12. The visual prosthesis system of claim 10, wherein the first high frequency signal and the second high frequency signal are operative to transmit electrical power to the retina implant.

13. The visual prosthesis system of claim 10, further comprising a video camera adapted for acquiring image data and for providing a video signal.

14. The visual prosthesis system of claim 10, wherein the video camera is integrated into an eyeglass frame.

15. The visual prosthesis system of claim 10, further comprising a data processing unit, the data processing unit being adapted for converting a video signal into corresponding stimulation data for the retina implant.

16. The visual prosthesis system of claim 10, wherein at least one of the first high frequency signal and the second high frequency signal is modulated in accordance with stimulation data to be transmitted to the retina implant.

17. The visual prosthesis system of claim 10, wherein the retina implant comprises an array of micro-contacts adapted for contacting ganglia of the patient'"'"'s retinal tissue.

18. The visual prosthesis system of claim 17, wherein the retina implant is adapted for receiving stimulation data and for stimulating the micro-contacts according to the stimulation data.

19. The visual prosthesis system of claim 17, wherein the retina implant comprises a stimulation chip adapted for converting stimulation data into corresponding stimulation pulses for the array of micro-contacts.

20. A method for supplying power to a retina implant at least partly located in the interior of a patient'"'"'s eye, the method comprising

generating a first high frequency signal and a second high frequency signal, wherein the second high frequency signal is phase shifted relative to the first high frequency signal,

applying the first high frequency signal to a first transmission coil and the second high frequency signal to a second transmission coil,

transmitting the first high frequency signal by the first transmission coil and the second high frequency signal by the second transmission coil.

21. The method of claim 20, further comprising

receiving a superposed high frequency signal at a receiver coil of the retina implant.

22. The method of claim 20, wherein the superposed high frequency signal comprises a first signal component transmitted by the first transmission coil and a second signal component transmitted by the second transmission coil.

23. The method of claim 20, wherein generating a first high frequency signal and a second high frequency signal comprises

generating a high frequency signal,

converting the high frequency signal into a first high frequency signal and a second high frequency signal, wherein the second high frequency signal is phase shifted relative to the first high frequency signal.

24. The method of claim 20, further comprising

generating, in addition to the first and the second high frequency signal, further high frequency signals,

applying the further high frequency signals to further transmission coils.

25. The method of claim 20, further comprising

modulating at least one of the first high frequency signal and the second high frequency signal in accordance with stimulation data to be transmitted to the retina implant.

26. The method of claim 20, further comprising

adjusting the phase shift between the first high frequency signal and the second high frequency signal to optimize energy transfer to the retina implant.

27. The method of claim 20, further comprising

adjusting respective signal amplitudes of the first high frequency signal and the second high frequency signal to optimize energy transfer to the retina implant.