Protocol implementation for telemetry communications involving implantable medical devices

• US 8,108,048 B2
• Filed: 11/30/2005
• Issued: 01/31/2012
• Est. Priority Date: 11/30/2005
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Masoud, Javaid
• Primary Examiner(s): Layno, Carl H
• Assistant Examiner(s): BEHRINGER, LUTHER G
• Application Number:
  US11/290,690
• Publication Number:
  US 20070123946A1
• Time in Patent Office: 2,253 Days
• Field of Search: 600/509, 607/30, 607/32, 607/59, 607/60, 607/56
• US Class Current: 607/60
• CPC Class Codes: A61N 1/37276 characterised by means for reducing power consumption during telemetry
• CPC Class Codes: Y10S 128/903 Radio telemetry

Abstract

Embodiments of the invention relate to optimizing telemetry communication involving one or more medical devices and one or more electrical devices. The telemetry communication is optimized by implementing software and/or one or more additional circuits within at least one medical device and at least one electrical device to provide one or more modes or functions of optimizing transfer of data between the medical device and the at least one electrical device, minimizing interference of the data transfer, and reducing data transfer time and/or preserving electrical energy sources of one or more of the medical device and the at least one electrical device.

Claims

1. A system for telemetry communication involving multiple medical devices comprising:

an implantable medical device;

configured to communicate data over a communication channel during telemetry communications sessions using at least one of a handshaking mode and a low transfer rate mode for each of the telemetry communication sessions, the handshaking mode being configured to communicate over a first bandwidth and the low transfer rate mode being configured to communicate over the first bandwidth and a second bandwidth narrower than the first bandwidth;

wherein at least one of the handshaking mode and the low transfer rate mode have a plurality of modulation schemes which modulate data transmitted during the telemetry communications sessions; and

comprising circuitry configured to select one of the at least one of the handshaking mode and the low transfer rate mode and, if the one of the at least one of the handshaking mode and the low transfer rate mode has a plurality of modulation schemes, selecting one of the plurality of modulation schemes; and

a plurality of electrical devices, each of the electrical devices being configured to enable telemetry communications with the implantable medical device using one of the at least one of the handshaking mode and the low transfer rate mode between that particular electrical device and the implantable medical device for each telemetry communication session; and

wherein the handshaking mode is configured to maintain the communication channel between the implantable medical device and one of the plurality of electrical devices by locking the communication channel by transmitting handshaking signals not used, for transmitting patient data.

2. The system of claim 1, wherein the implantable medical device comprises a cardiac device.

3. The system of claim 1, wherein the plurality of electrical devices comprise at least one medical instrumentation implanted in the patient and at least one external communication device.

4. The system of claim 3, wherein the at least one medical instrumentation comprises one or more of a drug delivery pump, a stimulator, a physiologic monitor, a recorder, an implant, and an artificial organ.

5. The system of claim 3, wherein the at least one external communication device comprises one or more of a portable programmer, an interrogator, a recorder, a monitor, and a telemetered signals transceiver.

6. The system of claim 1, wherein the circuitry comprises a processing unit.

7. The system of claim 1, wherein at least one of the plurality of modulation schemes is one of noise modulation, general spread spectrum encoding, bi-phase encoding, Frequency Shift Key (FSK), Time Division Multiple Access (TDMA), pre-emphasis/de-emphasis of baseband, vestigial, Code Division Multiple Access (CDMA), Quadrature Amplitude Modulation (QAM), pi/8, Quad-QAM, 256-QAM, 16-QAM, delta modulation, Phase Shift Key (PSK), Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Shift Keying (QASK), minimum shift keying, Tamed Frequency Modulation (TFM), Orthogonal Frequency Division Multiplexing (OFDM), BLUETOOTH communication protocol, any 802.11 modulation configuration, Worldwide Interoperability for Microwave Access (WiMAX), any 802.16 modulation configuration, 802.15.4, and Zigbee.

8. The system of claim 1, wherein the data comprises one or more of stored physiologic data, real-time generated physiologic data, and non-physiologic data.

9. The system of claim 1, further comprising an external processing monitor configured to enable telemetry communications with the implantable medical device and the plurality of electrical devices.

10. The system of claim 1, wherein the handshaking mode is enabled via software preprogrammed in the circuitry and circuits of the circuitry, and wherein the software and circuits are configured to control the implantable medical device and the one of the plurality of electrical devices to periodically transmit the handshaking signals therebetween enabling the communication channel to be locked prior to transferring the data.

11. The system of claim 1, wherein the low transfer rate mode is enabled via software preprogrammed in the circuitry and circuits of the circuitry, and wherein the software and circuits are configured to provide one or more of the following:

lower rate of transferring the data enabling increased Signal-to-Noise Ratio,

control the implantable medical device unit to receive feedback from the one of the plurality of electrical devices during the data transfer and use the feedback for noise modulation of the data, and

maintain a portion of the implantable medical device in an “

off”

state during one or more of data receipt and transfer to conserve an electrical energy source of the implantable medical device.

12. The system of claim 1, wherein the implantable medical device is further configured to enable telemetry communications using a data burst mode enabled via software preprogrammed in the circuitry and circuits of the circuitry, and wherein the software and circuits are configured to provide one or more of the following:

transfer the data in bursts over lengths of time during which a recorder used in conjunction with a memory unit of the implantable medical device reaches capacity, and

transfer the data using a modulation technique in which multiple distinct spectrums are used for modulated data.

13. The system of claim 12, further comprising a loop recorder within the circuitry, wherein the loop recorder is configured to store the data prior to the data transfer.

14. The system of claim 1, wherein the implantable medical device is further configured to enable telemetry communications using a random access protocol mode enabled via software preprogrammed in the circuitry and circuits of the circuitry, and wherein the software and circuits are configured to control the implantable medical device and the at one of the plurality of electrical devices to facilitate a randomization of the data decreasing potential of interference with the data.

15. The system of claim 14, wherein the randomization comprises the process used in ALOHA networks.

16. The system of claim 1 wherein the circuitry selects the one of the handshaking mode and the low transfer rate mode for each one of the telemetry communication sessions based, at least in part, on at least one of a transmission rate, ambient noise and energy consumption.

17. A system for optimizing telemetry communication involving multiple medical devices comprising:

an implantable medical device;

configured to communicate data over a communication channel during telemetry communications sessions using at least one of a handshaking mode and a low transfer rate mode for each of the telemetry communication sessions, the handshaking mode being configured to communicate over a first bandwidth and the low transfer rate mode being configured to communicate over the first bandwidth and a second bandwidth narrower than the first bandwidth;

wherein at least one of the handshaking mode and the low transfer rate mode have a modulation scheme which modulates data transmitted during the telemetry communications sessions; and

comprising circuitry configured to select one of the at least one of the handshaking mode and the low transfer rate mode and, if the particular one of the multiple modes of protocol has the modulation scheme, apply the modulation scheme;

an electrical device configured to enable telemetry communications with the implantable medical device using one of the at least one of the handshaking mode and the low transfer rate mode between the electrical device and the implantable medical device for each telemetry communication session; and

wherein the handshaking mode is configured to maintain the communication channel between the implantable medical device and the electrical device by locking the communication channel by transmitting handshaking signals not used for transmitting patient data.

18. The system of claim 17, wherein the circuitry has optimizing software preprogrammed therein and additional circuits, and wherein the optimizing software and additional circuits are configured to optimize one of the telemetry communications sessions by one or more of the following:

controlling the implantable medical device and the electrical device to transmit handshaking signals therebetween according to the handshaking mode,

lowering rate of the data transfer enabling increased Signal-to-Noise Ratio according to the low transfer rate mode,

transferring the data in bursts over lengths of time during which a recorder used in conjunction with a memory unit of the implantable medical device reaches capacity, and

transferring the data using the plurality of modulation schemes in which multiple distinct spectrums are used for modulated data.

19. The system of claim 17, wherein the circuitry has interference minimizing software preprogrammed therein and additional circuits, and wherein the interference minimizing software and additional circuits are configured to minimize interference of one of the telemetry communications sessions by one or more of the following:

controlling the implantable medical device to receive feedback from the electrical device during a telemetry communications session and use the feedback for noise modulation of the one of the telemetry communications sessions according to the low transfer rate mode, and

controlling the implantable medical device and the electrical device to facilitate a randomization of the one of the telemetry communications sessions.

20. The system of claim 17, wherein the circuitry has energy conserving software preprogrammed therein and additional circuits, and wherein the energy conserving software and additional circuits are configured to conserve an electrical energy source of the implantable medical device by one or more of the following:

maintaining a portion of the implantable medical device, in an “

off”

state during data receipt and transfer to conserve the electrical energy source of the implantable medical device according to the low transfer rate mode, and

providing one of the telemetry communications sessions in bursts over lengths of time during which a memory unit of the implantable medical device reaches capacity.

21. A method of optimizing telemetry communication involving multiple medical devices comprising:

providing an implantable medical device, the implantable medical device;

configured to communicate data over a communication channel during telemetry communications sessions using at least one of a handshaking mode and a low transfer rate mode for each of the telemetry communication sessions, the handshaking mode being configured to communicate over a first bandwidth and the low transfer rate mode being configured to communicate over the first bandwidth and a second bandwidth narrower than the first bandwidth;

wherein at least one of the handshaking mode and the low transfer rate mode have a modulation scheme which modulates data transmitted during the telemetry communications sessions; and

comprising circuitry configured to select one of the at least one of the handshaking mode and the low transfer rate mode and, if the one of the at least one of the handshaking mode and the low transfer rate mode has a plurality of modulation schemes, apply the modulation scheme; and

providing a plurality of electrical devices configured to enable telemetry communications with the implantable medical device using one of the at least one of the handshaking mode and the low transfer rate mode for each telemetry communication session; and

wherein the handshaking mode is configured to maintain the communication channel between the implantable medical device and one of the plurality of electrical devices by locking the communication channel by transmitting handshaking signals not used for transmitting patient data.