Monitoring device
Patent 4428381 Issued on January 31, 1984. Estimated Expiration Date: 
March 13, 2001. 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.
March 13, 2001. 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 3646606 3786190 3799147 3819863 3872252 Instantaneous frequency measurement system Electrocardiographic computer Electrocardiographic computer 4093821 Recorder for cardiac signals with manually actuated event marking InventorAssigneeApplicationNo. 06/243225 filed on 03/13/1981US Classes:600/528, Detecting heart sound128/904, TELEPHONE TELEMETRY600/586Detecting sound generated within bodyExaminersPrimary: Cohen, Lee S.Assistant: Sykes, Angela D. Attorney, Agent or FirmInternational ClassH04M 11/00 (20060101)AbstractApparatus for technique for monitoring physiological parameters. An acoustic sensor or microphone is placed in close proximity to the chest of a patient having one or two prosthetic heart valves. These heart valves produce clicks characteristic of opening and closing action. The acoustic sensor picks up the sound of these clicks and transfers them as electrical energy to a transmitter unit. The transmitter unit processes the analog signal, converts it to a digital signal and establishes the key timing factors involved. This digital data is stored in a memory buffer within the transmitter. Subsequently, this information is modulated and placed on telephone lines for transmission to a central monitoring site. At the monitoring site a demodulator returns the data to baseband digital signals. A computer at the central monitoring site displays the information in the time domain and also converts the information for display in the frequency domain.Other References
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