Cardiac compression wave measuring system and method
US4989611A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1988 |
| Grant date | Feb 5, 1991 |
| Priority date | — |
| Expiry date | Aug 19, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/7203
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Seismic techniques and principles are used to provide a noninvasive method and apparatus for assessing selective cardiac performance by detecting compression waves generated by heart muscle function. An analog signal is generated by detecting compression waves in the range of 0.025 Hz to about 800 Hz at an exterior surface of a subject's body by an accelerometer having a sensitivity of one (1) micro inch at one (1) Hz. Compression waves at frequencies above about 50 Hz are eliminated from the analog signal and then single full-cycle functions of the heart muscle are selected from a series of such cycles making up the analog signal. The selected single cycles may be averaged and waveform distortion may be removed from the averaged signal. Total energy level of the compression wave may be calculated and then the averaged signal may be displayed for visual analysis of a compression wave cycle representative of the muscle function of the heart.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.