System and method for controlling radio frequency scanning attributes of an implantable medical device

• US 20130165819A1
• Filed: 12/23/2011
• Published: 06/27/2013
• Est. Priority Date: 12/23/2011
• Status: Abandoned Application

• Current Assignee: Pacesetter Incorporated (Abbott Laboratories)
• Original Assignee: Pacesetter Incorporated (Abbott Laboratories)
• Inventors: Tieu, Thanh
• Application Number:
  US13/336,725
• Publication Number:
  US 20130165819A1
• Time in Patent Office: Days
• US Class Current: 600/595
• CPC Class Codes: A61B 2562/0219 Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
• CPC Class Codes: A61B 2562/028 Microscale sensors, e.g. electromechanical sensors [MEMS]
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/1116 Determining posture transitions
• CPC Class Codes: A61B 5/1118 Determining activity level
• CPC Class Codes: A61N 1/362 Heart stimulators heart defibrillators A61N1/39
• CPC Class Codes: A61N 1/37252 Details of algorithms or data aspects of communication system, e.g. handshaking, transmitting specific data or segmenting data
• CPC Class Codes: A61N 1/37276 characterised by means for reducing power consumption during telemetry

Abstract

A method and system are provided for controlling radio frequency (RF) scanning attributes of an implantable medical device (IMD) that include configuring an IMD to establish an RF connection over a predetermined frequency band based on a scan attribute. The method and system may also include storing, in the IMD, predetermined first and second values for the scan attribute to define different first and second scan modes, respectively. The method and system may also include determining a posture state of a patient, in which the IMD is implanted, and switching between the predetermined first and second values for the scan attribute, based on the posture state determined, to cause the IMD to switch between the first and second scan modes.

Claims

1. A method for controlling radio frequency (RF) scanning attributes of an implantable medical device (IMD), comprising:

configuring an IMD to establish an RF connection with an external device over a predetermined frequency band based on at least one scan attribute;

storing, in the IMD, predetermined first and second values for the scan attribute to define different first and second scan modes, respectively;

determining a posture state of a patient, in which the IMD is implanted; and

switching between the predetermined first and second values for the scan attribute, based on the posture state determined, to cause the IMD to switch between the first and second scan modes.

2. The method of claim 1, wherein the determining includes sensing a posture of a patient from a sensor within the IMD, the sensor providing a posture signal and comparing the posture signal to potential posture states to identify an actual posture state.

3. The method of claim 1, wherein the configuring further comprises configuring the IMD to establish RF connections over primary and secondary frequency bands that are non-overlapping and distinct from one another.

4. The method of claim 1, wherein the scan attribute represents scan rate, the method further comprising scanning the predetermined frequency band at different first and second scan rates when in the first and second scan modes, respectively.

5. The method of claim 1, wherein the scan attribute represents at least one of scan rate, scan receive power, a frequency range of the predetermined frequency band, antenna impedance, antenna capacitance, and antenna inductance.

6. The method of claim 1, further comprising calibrating the IMD to monitor for potential posture states including at least one of a supine state, prone state, right side position and left side position.

7. The method of claim 1, further comprising, when in the first scan mode, scanning channels in the predetermined frequency band for an RF connection request from an authorized external patient care system.

8. The method of claim 1, further comprising, when in the first scan mode, scanning the predetermined frequency band at a first scan rate for an RF connection request and, when in the second scan mode, scanning the predetermined frequency band at a second scan rate for the RF connection request.

9. The method of claim 1, further comprising, in response to receiving an RF connection request over the predetermined frequency band, initiating scanning of a secondary frequency band for communications data from an external device.

10. An implantable medical device (IMD), comprising:

an RF module configured to operate in first and second scan modes to establish an RF connection over a predetermined frequency band based on a scan attribute;

memory configured to store first and second values for the scan attribute to define different first and second scan modes, respectively;

a sensor configured to sense a posture state of a patient; and

a controller configured to load the RF module with one of the first and second values for the scan attribute, based on the posture state determined, to cause the RF module to switch between the first and second scan modes.

11. The IMD of claim 10, wherein the sensor senses a posture of a patient, in which the IMD is implanted, the sensor outputting a posture signal, the controller comparing the posture signal to potential posture states to identify an actual posture state of the patient.

12. The IMD of claim 10, wherein the RF module is configured to establish RF connections over primary and secondary frequency bands that are non-overlapping and distinct from one another.

13. The IMD of claim 10, wherein the scan attribute represents scan rate, the RF module scanning the predetermined frequency band at different first and second rates when in the first and second scan modes, respectively.

14. The IMD of claim 10, wherein the scan attribute represents at least one of scan rate, scan receive power, a frequency range of the predetermined frequency band, antenna impedance, antenna capacitance, and antenna inductance.

15. The IMD of claim 10, wherein the controller is configured to calibrate the IMD to monitor for potential posture states including at least one of a supine state, prone state, right side position and left side position.

16. The IMD of claim 10, wherein the RF module, when in the first scan mode, scans channels in the predetermined frequency band for an RF connection request from an authorized external patient care system.

17. The IMD of claim 10, wherein the RF module, when in the first scan mode, scans the predetermined frequency band at a first scan rate for an RF connection request and, when in the second scan mode, scans the predetermined frequency band at a second scan rate for the RF connection request.

18. The IMD of claim 10, wherein the controller, in response to receiving an RF connection request over the predetermined frequency band, causes the RF module to initiate scanning of a secondary frequency band for communications data from an external device.

19. A system comprising:

a patient care system (PCS) configured to monitor at least one physiological attribute of a patient;

an implantable medical device (IMD) that is configured to wirelessly communicate with the PCS, the IMD comprising;

an RF module configured to operate in first and second scan modes;

a sensor configured to sense a posture state of a patient; and

a controller configured to cause the RF module to switch between the first and second scan modes based on the posture state of the patient.

20. The system of claim 19, wherein the controller causes the RF module to operate in the first scan mode when the posture state of the patient is vertical, and wherein the controller causes the RF module to operate in the second scan mode when the posture state of the patient is horizontal.