Method and apparatus for pulmonary artery pressure signal isolation

• US 7,955,269 B2
• Filed: 06/22/2009
• Issued: 06/07/2011
• 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:
  US12/489,233
• Publication Number:
  US 20090254138A1
• Time in Patent Office: 715 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 method, comprising:

receiving a pulmonary artery pressure (PAP) signal from an implantable PAP sensor through a wireless communication link;

adjusting the PAP signal using a signal indicative of posture; and

isolating a plurality of signals from the adjusted PAP signal using a signal processor.

2. The method of claim 1, wherein the plurality of signals comprises one or more cardiac signals and one or more respiratory signals.

3. The method of claim 2, wherein isolating the plurality of signals from the PAP signal comprises:

isolating a cardiac signal using an adaptive filter having a pass-band; and

adjusting the pass-band dynamically using a physiological signal or parameter.

4. The method of claim 2, wherein isolating the plurality of signals from the PAP signal comprises:

isolating a respiratory signal using an adaptive filter having a pass-band; and

adjusting the pass-band dynamically using a physiological signal or parameter.

5. The method of claim 1, comprising:

receiving the PAP signal using an implantable medical device; and

isolating the plurality of signals from the PAP signal using the implantable medical device.

6. The method of claim 1, wherein receiving the PAP signal comprises receiving an ultrasonic signal through an ultrasonic telemetry link and demodulating the ultrasonic signal.

7. The method of claim 1, wherein receiving the PAP signal comprises receiving an electromagnetic signal through a far-field radio-frequency telemetry link and demodulating the electromagnetic signal.

8. The method of claim 1, wherein receiving the PAP signal comprises receiving a magnetic signal through an inductive telemetry link and demodulating the magnetic signal.

9. The method of claim 1, further comprising adjusting the PAP signal using an atmospheric pressure before isolating the plurality of signals.

10. The method of claim 1, wherein isolating the plurality of signals comprises:

filtering the PAP signal using at least one adaptive filter having a pass-band; and

dynamically adjusting the pass-band using a physiological signal or parameter.

11. The method of claim 10, wherein dynamically adjusting the pass-band comprises:

detecting a heart rate; and

adjusting the pass-band dynamically as a function of the heart rate.

12. The method of claim 1, wherein isolating the plurality of signals comprises isolating the one or more cardiac signals by sampling the PAP signal at a predetermined type event in each cycle of a cyclic physiological signal.

13. The method of claim 1, wherein the plurality of signals comprises one or more of an atmospheric pressure signal, a posture signal, a weather signal, an altitude signal, a Valsalva signal, and a Mueller signal.

14. The method of claim 1, further comprising delivering one or more therapies using an implantable medical device.

15. The method of claim 14, further comprising controlling the delivery of the one or more therapies using one or more signals selected from the plurality of signals isolated from the PAP signal.

16. The method of claim 15, wherein the one or more therapies comprises a cardiac resynchronization therapy.

17. The method of claim 1, wherein isolating the plurality of signals comprises algorithmically pruning specified type outlier components from the PAP signal.

18. The method of claim 1, wherein receiving the PAP signal from the implantable PAP sensor comprises receiving the PAP signal from a sensor positioned within a pulmonary artery.

19. The method of claim 18, wherein receiving the PAP signal from the implantable PAP sensor comprises receiving the PAP signal from a sensor secured to an anchoring system having a stent-like structure configured to be secured in the pulmonary artery.