Method and apparatus for pulmonary artery pressure signal isolation

• US 7,566,308 B2
• Filed: 10/13/2005
• Issued: 07/28/2009
• Est. Priority Date: 10/13/2005
• Status: Active Grant

• Current Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Original Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Inventors: Stahmann, Jeffrey E.
• Primary Examiner(s): Marmor, II; Charles A
• Assistant Examiner(s): JANG, CHRISTIAN YONGKYUN
• Application Number:
  US11/249,624
• Publication Number:
  US 20070088221A1
• Time in Patent Office: 1,384 Days
• Field of Search: 600/485, 600/486
• US Class Current: 600/486
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61N 1/3627 for treating a mechanical deficiency of the heart, e.g. congestive heart failure or cardiomyopathy
• CPC Class Codes: A61N 1/36564 controlled by blood pressure

Abstract

An implantable system senses a pulmonary artery pressure (PAP) signal using an implantable sensor placed in the pulmonary artery and isolates a plurality of signals from the PAP signal for diagnostic and/or therapeutic use. Each signal is extracted from the PAP signal using its known frequency characteristics and/or timing relationship with one or more detectable events.

Claims

1. A system for processing signals sensed by an implantable pulmonary artery pressure (PAP) sensor located within a pulmonary artery, the system comprising:

an implantable medical device adapted to be communicatively coupled to the implantable PAP sensor via wireless telemetry, the implantable medical device including;

a wireless communication circuit adapted to receive a PAP signal from the implantable PAP sensor; and

a PAP signal processor coupled to the wireless communication circuit, the PAP signal processor including a posture adjustment module adapted to adjust the PAP signal using a posture signal and a signal isolation module adapted to isolate a plurality of signals from the PAP signal; and

a posture sensor, communicatively coupled to the posture adjustment module, to sense the posture signal.

2. The system of claim 1, wherein the signal isolation module comprises at least one of a cardiac signal isolation module adapted to isolate one or more cardiac signals from the PAP signal and a respiratory signal isolation module adapted to isolate one or more respiratory signals from the PAP signal.

3. The system of claim 2, wherein the cardiac signal isolation module comprises an adaptive filter having a pass-band dynamically adjusted using a physiological signal or parameter.

4. The system of claim 2, wherein the respiratory signal isolation module comprises an adaptive filter having a pass-band dynamically adjusted using a physiological signal or parameter.

5. The system of claim 2, wherein the cardiac signal isolation module comprises a first adaptive filter having a first pass-band dynamically adjusted using a heart rate, and the respiratory signal isolation module comprises a second adaptive filter having a second pass-band dynamically adjusted using the heart rate, and further comprising a heart rate detector to detect the heart rate.

6. The system of claim 2, wherein the cardiac signal isolation module comprises a triggered sampler to sample the PAP signal at a predetermined type event in each cycle of a cyclic physiological signal.

7. The system of claim 6, wherein the cyclic physiological signal is a respiratory signal indicative of a predetermined type event in each respiratory cycle, and further comprising a respiratory sensor, coupled to the PAP signal processor, to sense the respiratory signal.

8. The system of claim 2, wherein the signal isolation module comprises the cardiac signal isolation module and the respiratory signal isolation module, the cardiac signal isolation module and the respiratory signal isolation module each including an adaptive filter having a pass band dynamically adjustable using a heart rate.

9. The system of claim 1, wherein the PAP signal processor further comprises an atmospheric pressure adjustment module adapted to adjust the PAP signal using an atmospheric pressure, and further comprising a barometer, communicatively coupled to the atmospheric pressure adjustment module, to sense the atmospheric pressure.

10. The system of claim 1, wherein the PAP signal processor further comprises a pruning module to algorithmically prune specified type outlier components from the PAP signal.

11. The system of claim 1, wherein the signal isolation module comprises one or more of:

an atmospheric pressure signal isolation module to isolate an atmospheric pressure signal from the PAP signal;

a posture signal isolation module to isolate a posture signal from the PAP signal;

a weather signal isolation module to isolate a weather signal from the PAP signal;

an altitude signal isolation module to isolate an altitude signal from the PAP signal;

a Valsalva signal isolation module to isolate a Valsalva signal from the PAP signal; and

a Mueller signal isolation module to isolate a Mueller signal from the PAP signal.

12. The system of claim 1, comprising an ultrasonic telemetry link communicatively coupling the implantable medical device to the implantable PAP sensor.

13. The system of claim 1, comprising a far-field radio frequency telemetry link communicatively coupling the implantable medical device to the implantable PAP sensor.

14. The system of claim 1, comprising an inductive telemetry link communicatively coupling the implantable medical device to the implantable PAP sensor.

15. The system of claim 1, wherein the implantable medical device further comprises a therapy delivery device to deliver one or more therapies.

16. The system of claim 15, wherein the implantable medical device further comprises a controller coupled to the therapy circuit, the controller adapted to control the delivery of the one or more therapies using at least one of the isolated signals.

17. The system of claim 16, wherein the therapy delivery device includes a pacing output circuit, and the controller is adapted to control a delivery of a cardiac resynchronization therapy from the pacing output circuit.

18. The system of claim 1, wherein the PAP signal processor further comprises an atmospheric pressure adjustment module adapted to adjust the PAP signal using an atmospheric pressure, and further comprising an external pressure calibrator communicatively coupled to the implantable medical device, the external pressure calibrator including a barometer to sense the atmospheric pressure.

19. The system of claim 1, wherein the PAP signal processor is adapted to band-pass filter the PAP signal using a low cutoff frequency in a range of approximately 0.000001 Hz to 0.1 Hz and a high cutoff frequency in a range of approximately 3 Hz to 30 Hz.