Method and apparatus for detecting heart sounds
Patent 4446873 Issued on May 8, 1984. Estimated Expiration Date: 
May 8, 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.
May 8, 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 ReferencesInventorsAssigneeApplicationNo. 06/241388 filed on 03/06/1981US Classes:600/528Detecting heart soundExaminersPrimary: Kamm, William E.Attorney, Agent or FirmInternational ClassesA61B 5/024 (20060101)A61B 5/0456 (20060101) A61B 5/0452 (20060101) A61B 7/00 (20060101) A61B 7/04 (20060101) AbstractFrom a heart sound signal input the occurrence of a first occurring heart sound is detected. Thereupon a predetermined heart sound enable window time is established, which for a first detection cycle is set to approximately the diastolic interval for the maximum heart rate to be detected. If a second heart sound occurs within this heart sound enable window time, this second heart sound is detected as a systole heart sound. The first heart sound may be detected as a diastole heart sound. If a second heart sound does not occur within the heart sound enable window time the procedure is repeated with increasing heart sound enable time as long as a second heart sound occurs within an increased heart sound enable window time.Other References
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