Apparatus and method for chronically monitoring heart sounds for deriving estimated blood pressure
US6869404B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2003 |
| Grant date | Mar 22, 2005 |
| Priority date | — |
| Expiry date | Sep 4, 2023 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/7232
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A minimally invasive, implantable heart sound and ECG monitor and associated method for deriving blood pressure from heart sound data. The device is equipped with an acoustical sensor for detecting first and second heart sounds which are sampled and stored during sensing windows following R-wave and T-wave detections, respectively. ECG and heart sound data are stored in a continuous, looping memory, and segments of data are stored in long-term memory upon an automatic or manual data storage triggering event. Estimated blood pressure is calculated based on custom spectral analysis and processing of the first and second heart sounds. A calibration method includes measuring a patient's blood pressure using a standard clinical method and performing regression analysis on multiple spectral variables to identify a set of best fit weighted equations for predicting blood pressure. Concurrent ECG and estimated blood pressure may be displayed for review by a physician.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.