SIGNALING IN A MEDICAL IMPLANT BASED SYSTEM

• US 20100036459A1
• Filed: 08/06/2009
• Published: 02/11/2010
• Est. Priority Date: 08/06/2008
• Status: Abandoned Application

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: THIAGARAJAN, Ganesan, SHAH, Kumar Divyesh, BALAKRISHNAN, Jaiganesh, MURALI, Sriram, RAMAKRISHNAN, Sthanunathan
• Application Number:
  US12/536,520
• Publication Number:
  US 20100036459A1
• Time in Patent Office: Days
• US Class Current: 607/60
• CPC Class Codes: A61N 1/3727 characterised by the modulation technique

Abstract

Signaling in a medical implant based system. A method includes transmitting bits modulated with a predefined sequence in a band of channels by a first medical transceiver. The method includes detecting the predefined sequence by a second medical transceiver. The method also includes performing predetermined action if the predefined sequence is detected. In one example, the predetermined action includes determining presence of a signal.

Claims

1. A method comprising:

transmitting bits modulated with a predefined sequence in a band of channels by a first medical transceiver;

detecting the predefined sequence by a second medical transceiver; and

determining presence of a signal if the predefined sequence is detected.

2. The method as claimed in claim 1, wherein

the first medical transceiver is one of a medical implant transceiver and a medical controller transceiver;

and

the second medical transceiver is one of the medical implant transceiver and the medical controller transceiver.

3. The method as claimed in claim 1, wherein the transmitting comprises one of:

transmitting the bits modulated with a pseudorandom sequence;

transmitting the bits modulated with a gold code sequence;

transmitting the bits modulated with a barker sequence; and

transmitting the bits modulated with a walsh code sequence.

4. The method as claimed in claim 1, wherein the transmitting comprises:

spreading the bits with the predefined sequence.

5. The method as claimed in claim 1, wherein the detecting comprises:

correlating the signal with the predefined sequence.

6. The method as claimed in claim 5, wherein the detecting further comprises:

determining a peak value of a sample in a band of channels; and

checking the peak value against a threshold.

7. The method as claimed in claim 5, wherein the detecting further comprises:

determining a ratio of a peak value of a sample in an output obtained from the correlating to an average value of off-peak samples in the output; and

checking the ratio against a threshold.

8. The method as claimed in claim 1 and further comprising:

entering into an inactive state if the predefined sequence is not detected.

9. A method comprising:

transmitting bits modulated with a first predefined sequence of a plurality of predefined sequences by a first medical transceiver;

detecting the first predefined sequence by a second medical transceiver when the second medical transceiver enters into an active state; and

performing a predetermined action if the first predefined sequence is detected.

10. The method as claimed in claim 9 and further comprising:

determining the plurality of predefined sequences based on autocorrelation and cross-correlation properties.

11. The method as claimed in claim 9 and further comprising:

dividing a location comprising multiple first medical transceivers into cells;

assigning a predefined sequence of the plurality of predefined sequences for modulating the bits for association to the cells; and

assigning other predefined sequences of the plurality of predefined sequences to the cells for modulating bits for a predefined function, wherein no two adjacent cells have a similar predefined sequence for modulating the bits for the predefined function.

12. The method as claimed in claim 9, wherein the detecting comprises:

detecting the first predefined sequence at a physical layer of the second medical transceiver.

13. The method as claimed in claim 9, wherein performing the predetermined action comprises:

determining presence of a signal for association if the first predefined sequence is detected.

14. The method as claimed in claim 13 and further comprising:

processing the signal for association; and

sending an acknowledgment based on the processing.

15. The method as claimed in claim 14 and further comprising:

transmitting information identifying a predefined sequence of the plurality of predefined sequences that the first medical transceiver will use to transmit data.

16. The method as claimed in claim 9, wherein performing the predetermined action comprises one of:

determining presence of a poll signal if the first predefined sequence is detected; and

determining presence of a signal for data transfer if the first predefined sequence is detected.

17. A system comprising:

a medical implant transceiver comprising

a radio frequency receiver that receives a signal;

a demodulator that demodulates bits of the signal modulated with a predefined sequence;

a correlator that correlates the signal with the predefined sequence to detect the predefined sequence, that determines presence of the signal in the channel.

18. The system as claimed in claim 17 and further comprising:

a medical controller transceiver comprising

a predefined sequence spreader that spreads the bits with the predefined sequence;

a modulator that modulates the bits with the predefined sequence; and

a radio frequency transmitter that transmits the bits.

19. The system as claimed in claim 17, wherein the medical implant transceiver further comprises:

a peak-to-off-peak signal to noise ratio detector that detects the predefined sequence.