Transcutaneous energy and information transmission apparatus

• US 5,630,836 A
• Filed: 01/19/1995
• Issued: 05/20/1997
• Est. Priority Date: 01/19/1995
• Status: Expired due to Fees

• Current Assignee: Vascor, Inc.
• Original Assignee: Vascor, Inc.
• Inventors: Cuervo, David E., Prem, Edward K.
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): HUANG, STEPHEN D
• Application Number:
  US08/375,357
• Time in Patent Office: 852 Days
• Field of Search: 607/1, 607/2, 607/60, 607/61, 607/62, 607/66
• US Class Current: 607/61
• CPC Class Codes: A61N 1/37211 Means for communicating with stimulators
• CPC Class Codes: A61N 1/3727 characterised by the modulation technique
• CPC Class Codes: A61N 1/3787 from an external energy source

Abstract

An apparatus for transcutaneously transmitting power and communication signals to an implantable device. The apparatus can include generators for power and information signals; receivers; and a coupler for independently coupling the power signal and a first information signal. An internal unit can have receivers for power and information signals; a second signal generator; and an independent coupler. The first and second information signal can be transmitted at a frequency greater than the power frequency. The external unit can also include a signal conditioner for symmetrically transceiving the first and second information signals; and an external data controller for symmetrically controlling the information signals. The internal unit can also include a voltage regulator converter; an internal signal conditioner for symmetrically transceiving the information signals; and a data controller. Symmetrically controlling can include ASK modulation of a data signal upon an RF carrier signal.

Claims

1. An apparatus for transcutaneously providing a first power signal to and communication of a first and a second information signal with an implantable device, said apparatus comprising:

a. an external unit including first power means for generating said first power signal, first signalling means for generating said first information signal, first receiving means for receiving said second information signal, and first coupling means connected to said first power means and said signalling means and said first receiving means, said first coupling means for independently coupling said first power signal and said first information signal; and

b. an internal unit including second power means for receiving said first power signal, second signalling means for generating said second information signal, second receiving means for receiving said first information signal, and second coupling means connected to said second power means and said second signalling means and said second receiving means for independently coupling said first power signal and said second information signal.

2. The apparatus of claim 1 wherein said first power means generates said power signal at a power frequency, said first signalling means generates said first information signal at a frequency greater than said power frequency, said second signalling means generates said second information signal at a frequency greater than said power frequency, and said frequency of said first signalling means being different from said frequency of said second signalling means.

3. The apparatus of claim 2 wherein said external unit comprises:

a. a power converter for converting a power input signal at a first preselected frequency to said first power signal at said power frequency;

b. an external coupler connected to said power converter and coupled to a common transmission channel for transmitting said power signal and for communicating said first and second information signals;

c. an external signal conditioner interposed between said external coupler and said power converter for symmetrically transceiving said first and second information signals; and

d. an external data controller connected to said external signal conditioner for symmetrically controlling said first and second information signals.

4. The apparatus of claim 3 wherein said external data controller further comprises first suppression means for suppressing deterministic noise in at least one of said first and second information signals.

5. The apparatus of claim 4 wherein said internal data controller further comprises second suppressing means for suppressing deterministic noise in at least one of said first and second information signals.

6. The apparatus of claim 2 wherein said internal unit comprises:

an internal coupler coupled to a common transmission channel for receiving said first power signal and for communicating said first and second information signals;

b. a voltage regulator connected between said internal coupler and said implantable device, said voltage regulator for converting said first power signal into a second power signal having a preselected current and providing said second power signal to said implantable device;

c. an internal signal conditioner interposed between said internal coupler and said voltage regulator for symmetrically transceiving said first and second information signals; and

d. an internal data controller connected between said internal signal conditioner and said implantable device, said internal data controller for symmetrically controlling said first and second information signals.

7. The apparatus of claim 6 wherein said internal data controller further comprises second suppression means for suppressing deterministic noise in at least one of said first and second information signals.

8. The apparatus of claim 6 wherein said voltage regulator further comprises shunting means for confining said power signal to said internal coupler when said preselected current is approximately zero amperes, said shunting means being synchronized to coincide with zero-crossings of said preselected current, so that switching losses and electromagnetic interference are minimized thereby.

9. The apparatus of claim 1 wherein said first power means transmits said power signal at a first power frequency, and said first and second signalling means generates said first and second information signal at a frequency greater than said first power frequency, said frequency of said first signalling means being approximately equal to said frequency of said second signalling means.

10. The apparatus of claim 3 wherein said external unit comprises:

a. a power converter for converting a power input signal at a first preselected frequency to said first power signal at said power frequency;

b. an external coupler connected to said power converter and coupled to a common transmission channel for transmitting said first power signal and for communicating said first and second information signals;

c. an external signal conditioner interposed between said external coupler and said power converter for symmetrically transceiving said first and second information signals; and

d. an external data controller connected to said external signal conditioner for symmetrically controlling said first and second information signals.

11. The apparatus of claim 9 wherein said internal unit comprises:

a. an internal coupler coupled to a common transmission channel for receiving said first power signal and for communicating said first and second information signals;

b. a voltage regulator connected between said internal coupler and said implantable device, said voltage regulator for converting said first power signal into a second power signal having a preselected current and providing said second power signal to said implantable device;

c. an internal signal conditioner interposed between said internal coupler and said voltage regulator for symmetrically transceiving said first and second information signals; and

d. an internal data controller connected between said internal signal conditioner and said implantable device, said controller for symmetrically controlling said first and second information signals.

12. The apparatus of claim 11 wherein said external unit comprises:

a. a power converter for converting a power input signal at a first preselected frequency to said power signal at said power frequency;

b. an external coupler connected to said power converter and coupled to said common transmission channel for transmitting said power signal and for communicating said first and second information signals;

c. an external signal conditioner interposed between said external coupler and said power converter for symmetrically transceiving said first and second information signals; and

d. an external data controller connected to said external signal conditioner for symmetrically controlling said first and second information signals.

13. The apparatus of claim 12 wherein said external coupler includes a primary tuned circuit and said internal coupler includes a secondary tuned circuit.

14. The apparatus of claim 13 wherein said primary and secondary tuned circuits have a resonant frequency.

15. The apparatus of claim 14 wherein said resonant frequency is about 160 kilohertz.

16. The apparatus of claim 12 wherein said first signal conditioner includes a first frequency-selective filter, and said second signal conditioner includes a second frequency-selective filter, each of said frequency-selective filters having an upper cutoff frequency and a lower cutoff frequency and a center frequency.

17. The apparatus of claim 16 wherein the respective lower and upper cutoff frequencies of said first and second frequency-selective filters are about 7.9 megahertz and about 8.1 megahertz, and the center frequency of said first and second frequency selective filters is about 8 megahertz.

18. The apparatus of claim 12 wherein said symmetrically controlling includes amplitude-shift-keying modulation of a data signal upon a radio-frequency carrier signal of a preselected carrier frequency.

19. The apparatus of claim 18 wherein said preselected carrier frequency is about 8 megahertz.

20. The apparatus of claim 12 wherein said first preselected frequency is about zero Hertz and said power input signal is a DC power input signal.

21. The apparatus of claim 12 wherein the first preselected frequency is about 60 Hertz and said power input signal is an AC power input signal.

22. The apparatus of claim 12 wherein said power frequency is about 160 kilohertz.

23. The apparatus of claim 12 wherein said external data controller further comprises first suppression means for suppressing deterministic noise in at least one of said first and second information signals.

24. The apparatus of claim 23 wherein said internal data controller further comprises second suppressing means for suppressing deterministic noise in at least one of said first and second information signals.

25. The apparatus of claim 11 wherein said internal data controller further comprises second suppression means for suppressing deterministic noise in at least one of said first and second information signals.

26. The apparatus of claim 11 wherein said voltage regulator further comprises shunting means for confining said power signal to said internal coupler when said preselected current is approximately zero amperes, said shunting means being synchronized to coincide with zero-crossings of said preselected current, so that switching losses and electromagnetic interference are minimized thereby.

27. An apparatus for transcutaneously providing a power signal to and communication of a first and a second information signals with an implantable device, said apparatus comprising:

a. an external unit having

i. a power converter for converting a power input signal at a first preselected frequency to a power signal at a power frequency;

ii. an external coupler connected to said power converter and coupled to a common transmission channel for transmitting said power signal and for communicating said first and second information signals, said transmitting being independent of said communicating;

iii. an external signal conditioner interposed between said external coupler and said power converter for symmetrically transceiving said first and second information signals; and

iv. an external data controller connected to said external signal conditioner for symmetrically controlling said first and second information signals; and

b. an internal unit having

i. an internal coupler coupled to said common transmission channel for receiving said power signal and for communicating said first and second information signals, said receiving being independent of said communicating;

ii. a voltage regulator connected between said internal coupler and said implantable device, said voltage regulator for converting said power signal into said second power signal and providing said second power signal to said implantable device;

iii. an internal signal conditioner interposed between said internal coupler and said voltage regulator for symmetrically transceiving said first and second information signals; and

iv. an internal data controller connected between said internal signal conditioner and said implantable device, said controller for symmetrically controlling said first and second information signals.

28. The apparatus of claim 27 wherein said external coupler includes a primary tuned circuit and said internal coupler includes a secondary tuned circuit.

29. The apparatus of claim 27 wherein said first signal conditioner includes a first frequency-selective filter, and said second signal conditioner includes a second frequency-selective filter, each of said frequency-selective filters having an upper cutoff frequency and a lower frequency cutoff and a center frequency.

30. The apparatus of claim 29 wherein the respective lower and upper cutoff frequencies of said first and second frequency-selective filters are about 7.9 megaHertz and about 8.1 megahertz, and the center frequency of said first and second frequency selective filters is about 8 megahertz.

31. The apparatus of claim 27 wherein said symmetrically controlling includes amplitude-shift-keying modulation of a data signal upon a radio-frequency carrier signal of a preselected carrier frequency.

32. The apparatus of claim 31 wherein said preselected carrier frequency is about 8 megahertz.

33. The apparatus of claim 27 wherein said power frequency is about 160 kilohertz.

34. The apparatus of claim 27 wherein said primary and secondary tuned circuits have a resonant frequency.

35. The apparatus of claim 34 wherein said resonant frequency is about 160 kilohertz.

36. An apparatus for transcutaneously providing a power signal to and communication of a first and second information signals between an external control unit and an implantable device, said apparatus comprising:

a. an external unit having

i. a power converter for receiving a power input signal and converting said power input signal at said first preselected frequency to said power signal at a power frequency;

ii. an external coupler connected to said power converter and coupled to a common transmission channel, said external coupler for transmitting said signal and for communicating said first and second information signals, said transmitting being independent of said communicating;

iii. an external signal conditioner interposed between said external coupler and said power converter for symmetrically transceiving said first and second information signals through said common transmission channel; and

iv. an external data controller connected to said external signal conditioner for symmetrically controlling said first and second information signals, said external data controller having external link communicating said first and second information signals with said external control unit across said external link, said symmetrically controlling including modulation and demodulation of said first and second information signals according to a preselected modulation technique;

b. an internal unit having

i. an internal coupler coupled to said common transmission channel for receiving said power signal, said internal coupler for receiving said power signal and for communicating said first and second information signals, said receiving being independent of said communicating;

ii. a voltage regulator connected between said internal coupler and said implantable device, said voltage regulator for converting said power signal into said second power signal, said second power signal having a preselected current with a preselected voltage at a preselected frequency, said voltage regulator providing said second power signal to said implantable device;

iii. an internal signal conditioner interposed between said internal coupler and said voltage regulator for symmetrically transceiving said first and second information signals through said common transmission channel; and

iv. an internal data controller connected between said internal signal conditioner and said implantable device for symmetrically controlling said first and second information signals, said symmetrically controlling including modulation and demodulation of said first and second information signals according to said preselected modulation technique, said implantable device being in communication with said external control unit thereby; and

c. said external coupler including a primary tuned circuit, said internal coupler including a secondary tuned circuit, said primary and secondary tuned circuits having a resonant frequency, said first signal conditioner including a first frequency-selective filter, said second signal conditioner including a second frequency-selective filter, each of said first and second frequency-selective filters having a cutoff frequencies and a center frequency, said preselected modulation technique including amplitude-shift-keying modulation of a data signal upon a radio-frequency carrier signal of a preselected carrier frequency, said center frequency being approximately equal to said preselected carrier frequency.

37. The apparatus of claim 36 wherein said power frequency is about 160 kilohertz.

38. The apparatus of claim 36 wherein said cutoff frequencies of said first and second frequency-selective filters is between about 7.9 megahertz and 8.1 megahertz, and said center frequency is about 8 megahertz.

39. The apparatus of claim 36 wherein said preselected carrier frequency is about 8 megahertz.

40. The apparatus of claim 36 wherein said resonant frequency is about 160 kilohertz.

41. The apparatus of claim 36 wherein said external data controller further comprises first suppression means for suppressing deterministic noise in at least one of said first and second information signals.

42. The apparatus of claim 41 wherein said internal data controller further comprises second suppressing means for suppressing deterministic noise in at least one of said first and second information signals.

43. The apparatus of claim 36 wherein said internal data controller further comprises second suppression means for suppressing deterministic noise in at least one of said first and second information signals.

44. The apparatus of claim 36 wherein said voltage regulator further comprises shunting means for confining said power signal to said internal coupler when said preselected current is approximately zero amperes, said shunting means being synchronized to coincide with zero-crossings of said preselected current, so that switching losses and electromagnetic interference are minimized thereby.