Cardiac compression wave measuring system and method
Patent 4989611 Issued on February 5, 1991. Estimated Expiration Date: 
August 19, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 19, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References Re27042 Re31097 3318303 3385289 3695253 3762397 3773033 3878832 3908639 Method and system for rapid non-invasive determination of the systolic time intervals InventorsApplicationNo. 234031 filed on 08/19/1988US Classes:600/508, Heart600/500Detecting blood vessel pulsationExaminersPrimary: Jaworski, Francis J.Attorney, Agent or FirmForeign Patent References
International ClassA61B 005/02AbstractSeismic 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.Other References
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