Event registration for automatic threshold setting

• US 8,052,610 B2
• Filed: 12/28/2006
• Issued: 11/08/2011
• Est. Priority Date: 12/28/2006
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Bullens, Roland W. M., Kessels, Roger
• Primary Examiner(s): Mallari; Patricia
• Assistant Examiner(s): JANG, CHRISTIAN YONGKYUN
• Application Number:
  US11/617,063
• Publication Number:
  US 20080161701A1
• Time in Patent Office: 1,776 Days
• Field of Search: 600/484, 600/481, 600/547
• US Class Current: 600/481
• CPC Class Codes: A61B 5/0537 Measuring body composition by impedance, e.g. tissue hydration or fat content
• CPC Class Codes: A61B 5/0538 invasively, e.g. using a catheter
• CPC Class Codes: A61B 5/746 Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms alarms per se G08B
• CPC Class Codes: A61N 1/36521 the parameter being derived from measurement of an electrical impedance
• CPC Class Codes: A61N 1/3702 Physiological parameters A61N1/365 takes precedence; evoked response A61N1/371
• CPC Class Codes: A61N 1/37258 Alerting the patient
• CPC Class Codes: G08B 21/0453 worn on the body to detect health condition by physiological monitoring, e.g. electrocardiogram, temperature, breathing detecting, measuring or recording for diagnostic purposes A61B5/00
• CPC Class Codes: G16H 40/67 for remote operation

Abstract

An implantable medical device includes a sensor for sensing a first signal in a patient, detection circuitry for receiving the first signal, determining a parameter therefrom, and detecting a first event in response to the parameter. The device further includes control circuitry configured to receive a second signal corresponding to a second event and to determine a threshold from the stored parameter in response to receiving the second event signal. The detection circuitry detects the first event in response to the parameter crossing the determined threshold.

Claims

1. An implantable medical device, comprising:

a sensor for sensing a first signal in a patient;

detection circuitry for receiving the first signal and determining a parameter corresponding to the first signal;

memory for storing the parameter; and

control circuitry configured to receive a second signal corresponding to a defined first event following storage of the parameter and further configured to determine a threshold from the stored parameter in response to receiving the second signal;

wherein the detection circuitry comprises circuitry for detecting a defined second event in response to the parameter subsequently crossing the determined threshold; and

wherein determining the threshold comprises determining the threshold using a value of the parameter stored at a time prior to the receipt of the second signal.

2. A device according to claim 1, further comprising alarm circuitry for generating an alarm signal in response to the detected second event.

3. An implantable medical device, comprising:

a sensor for sensing a first signal in a patient;

detection circuitry for receiving the first signal and determining a parameter corresponding to the first signal;

memory for storing the parameter; and

control circuitry configured to receive a second signal corresponding to a defined first event following storage of the parameter and further configured to determine a threshold from the stored parameter in response to receiving the second signal;

wherein the detection circuitry comprises circuitry for detecting a defined second event in response to the parameter subsequently crossing the determined threshold; and

further comprising telemetry circuitry coupled to the control circuitry and wherein the second signal comprises an externally generated signal received by the telemetry circuitry.

4. A device according to claim 3 further comprising alarm circuitry for generating an alarm signal in response to the detected second event.

5. An implantable medical device, comprising:

a sensor for sensing a first signal in a patient;

detection circuitry for receiving the first signal and determining a parameter corresponding to the first signal;

memory for storing the parameter; and

control circuitry configured to receive a second signal corresponding to a defined first event following storage of the parameter and further configured to determine a threshold from the stored parameter in response to receiving the second signal;

wherein the detection circuitry comprises circuitry for detecting a defined second event in response to the parameter subsequently crossing the determined threshold; and

wherein the second signal corresponds to a worsening of the parameter subsequent to a storage of the parameter.

6. A device according to claim 5 further comprising alarm circuitry for generating an alarm signal in response to the detected second event.

7. An implantable medical device, comprising:

a sensor for sensing a first signal in a patient;

detection circuitry for receiving the first signal and determining a parameter corresponding to the first signal;

memory for storing the parameter; and

control circuitry configured to receive a second signal corresponding to a defined first event following storage of the parameter and further configured to determine a threshold from the stored parameter in response to receiving the second signal;

wherein the detection circuitry comprises circuitry for detecting a defined second event in response to the parameter subsequently crossing the determined threshold; and

wherein the sensor comprises an impedance sensor.

8. A device according to claim 7 wherein the impedance sensor is configured for sensing thoracic impedance.

9. A device according to claim 7 further comprising alarm circuitry for generating an alarm signal in response to the detected second event.

10. An implantable medical device system, comprising:

an implanted sensor for sensing a first signal in a patient;

detection circuitry for receiving the first signal and determining a parameter corresponding to the first signal;

memory for storing the parameter;

control circuitry configured to receive a second signal corresponding to a defined first event following storage of the parameter and further configured to determine a threshold from the stored parameter in response to receiving the second signal;

an implantable telemetry circuit providing the second signal to the control circuit; and

an external telemetry circuit in bidirectional communication with the implantable telemetry circuit, the external telemetry circuit adapted to transmit the second signal to the implantable telemetry circuit;

wherein the detection circuitry comprises circuitry for detecting a defined second event in response to the parameter subsequently crossing the determined threshold.

11. A system according to claim 10 further comprising alarm circuitry for generating an alarm signal in response to the detected second event.

12. A system according to claim 10 wherein determining the threshold comprises determining a threshold based upon a value of the parameter stored at a time prior to the receipt of the second signal.

13. A system according to claim 10 wherein the sensor comprises an impedance sensor.

14. A system according to claim 13 wherein the impedance sensor is configured for sensing thoracic impedance.