Method and system for rapid non-invasive determination of the systolic time intervals
Patent 4094308 Issued on June 13, 1978. Estimated Expiration Date: 
June 13, 1995. 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.
June 13, 1995. 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 3683164 3776221 3881481 Digital convolver matched filter and correlator Patent #: 4025772 InventorAssigneeApplicationNo. 05/715895 filed on 08/19/1976US Classes:600/528Detecting heart soundExaminersPrimary: Kamm, William E.Attorney, Agent or FirmAbstractA non-invasive method and means for determining beat-by-beat assessments of a patient's cardiac performance by measuring the "pre-ejection phase" (PEP) and the "left ventricular ejection time" (LVET), the aforementioned phrases also being known as the "systolic time intervals" (STI) of the heart. The system accomplishes its function through the following method: (1) transduction of the heart sounds into an electrical phonocardiogram (PCG) signal and controlled amplification thereof; (2) extraction of initial cardiac contraction and aortic valvular events by subjecting the PCG to the general inverse-filtering technique known as "deconvolution;" (3) electronic separation of the PEP, LVET and heart pulse intervals from the deconvolved PCG with microcomputer circuitry comprising microprocessor and digital logic assemblies; (4) precise measurement and simultaneous storage of the PEP, LVET, the PEP/LVET ratio, and the heart rate with the use of electronic digital counters, timers, dividers, and buffer memories after every heart beat; and (5) finally effecting digital readout for instantly displaying the systolic time intervals, their respective ratio, and the heart rate, or for storing them for later use.Other References
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