Apparatus and method for detecting Korotkoff sounds
Patent 4396018 Issued on August 2, 1983. Estimated Expiration Date: 
March 16, 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 16, 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 3101082 3334622 3581734 3771515 Monitoring apparatus and method for blood pressure and heart rate Noise rejecting electronic sphygmomanometer and methods for measuring blood pressure Portable blood pressure recorder Patent #: 4252127 InventorApplicationNo. 06/244467 filed on 03/16/1981US Classes:600/493, Electric signal generated by sensing means responsive to pulse or Korotkoff sounds600/586Detecting sound generated within bodyExaminersPrimary: Cohen, Lee S.Assistant: Sykes, Angela D. Attorney, Agent or FirmInternational ClassesA61B 5/022 (20060101)A61B 5/0285 (20060101) A61B 5/026 (20060101) A61B 7/00 (20060101) A61B 7/04 (20060101) AbstractApparatus and a method for detecting Korotkoff sounds using a pair of microphones carried by an inflatable cuff adapted to be wrapped around a limb of a patient whose blood pressure is to be determined. A Korotkoff sound is first sensed by one of the microphones to produce a first signal which is coupled to a delay unit which has an output signal delayed by a certain time interval, such as 12 millisecond. At the end of this interval, a window is opened. The same Korotkoff sound is later sensed by the second microphone whose output signal is applied to the window and passes through the window so long as it is open. The output signal then actuates a recorder, such as an oscillograph.Other References
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