Verification of pressure metrics

• US 8,827,913 B2
• Filed: 05/03/2011
• Issued: 09/09/2014
• Est. Priority Date: 05/03/2011
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Havel, William J., Bennett, Tommy D., Cho, Yong Kyun, Taepke, Robert T. II
• Primary Examiner(s): Kahelin, Michael
• Assistant Examiner(s): ALTER, MITCHELL E
• Application Number:
  US13/099,959
• Publication Number:
  US 20120283580A1
• Time in Patent Office: 1,225 Days
• Field of Search: 600/485, 600/513
• US Class Current: 600/485
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61B 5/686 Permanently implanted devices, e.g. pacemakers, other stimulators, biochips A61B5/6861 takes precedence
• CPC Class Codes: A61B 5/7207 of noise induced by motion artifacts
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives
• CPC Class Codes: A61N 1/36564 controlled by blood pressure
• CPC Class Codes: A61N 1/3702 Physiological parameters A61N1/365 takes precedence; evoked response A61N1/371

Abstract

An example system may include at least one pressure sensor configured to measure a cardiovascular pressure signal and another medical device configured to measure an electrical depolarization signal of the heart. The system determines a plurality of cardiovascular pressure metrics based on the measured cardiovascular pressure signal, including at least one cardiovascular pressure metric indicative of a timing of at least one cardiac pulse. The system also determines a metric indicative of a timing of at least one heart depolarization within the measured electrical depolarization signal. The system compares the timing of the at least one cardiac pulse to the timing of the at least one depolarization, and determines whether to discard the plurality of cardiovascular pressure metrics based on whether the timings substantially agree.

Claims

1. A system comprising:

at least one pressure sensor configured to measure a cardiovascular pressure signal;

a medical device configured to measure an electrical depolarization signal of the heart;

at least one analysis module configured to;

determine a plurality of cardiovascular pressure metrics based on the measured cardiovascular pressure signal, wherein the plurality of cardiovascular pressure metrics includes at least one cardiovascular pressure metric indicative of a timing of at least one cardiac pulse, and at least one of a systolic pressure and a diastolic pressure; and

determine a cardiac electrical metric indicative of a timing of at least one heart depolarization based on the measured electrical depolarization signal; and

at least one processor configured to;

compare the timing of the at least one cardiac pulse to the timing of the at least one heart depolarization; and

determine whether to discard the plurality of cardiovascular pressure metrics based on whether the timing of the at least one cardiac pulse and the timing of the at least one heart depolarization substantially agree.

2. The system of claim 1, wherein the cardiac electrical metric indicative of the timing of at the least one heart depolarization comprises a heart rate and the at least one cardiovascular pressure metric indicative of the timing of the at least one cardiac pulse comprises a pulse rate.

3. The system of claim 1, wherein the at least one pressure sensor is wirelessly coupled to the medical device.

4. The system of claim 3, wherein the pressure sensor is configured to wirelessly transmit the plurality of cardiovascular metrics to the medical device.

5. The system of claim 1, wherein the processor is configured to control the at least one pressure sensor to re-measure the cardiovascular pressure signal if the plurality of cardiovascular pressure metrics is discarded.

6. The system of claim 5, wherein the processor is configured to:

determine a number of times that the cardiovascular pressure signal has been re-measured in response to discarding the plurality of cardiovascular pressure metrics;

compare the number of times that the cardiovascular pressure signal has been re-measured to a predetermined threshold; and

determine whether to control the at least one pressure sensor to re-measure the cardiovascular pressure signal based on the comparison.

7. The system of claim 1, wherein the medical device comprises the processor.

8. The system of claim 1, wherein the medical device is configured for subcutaneous implantation within a patient.

9. A system comprising:

means for measuring a cardiovascular pressure signal;

means for measuring an electrical depolarization signal of the heart;

means for determining a plurality of cardiovascular pressure metrics based on the measured cardiovascular pressure signal, wherein the plurality of cardiovascular pressure metrics includes at least one cardiovascular pressure metric indicative of a timing of at least one cardiac pulse, and at least one of a systolic pressure and a diastolic pressure;

means for determining a cardiac electrical metric indicative of a timing of at least one heart depolarization within the measured electrical depolarization signal;

means for comparing the timing of the at least one cardiac pulse to the timing of the at least one heart depolarization ; and

means for determining whether to discard the plurality of cardiovascular pressure metrics based on whether the timing of the at least one cardiac pulse and the timing of the at least one heart depolarization substantially agree.

10. The system of claim 9, wherein the cardiac electrical metric indicative of the timing of the at least one heart depolarization comprises a heart rate and the at least one cardiovascular pressure metric indicative of the timing of the at least one cardiac pulse comprises a pulse rate.