Heart sound detector and synchronization for diagnostics

Patent 4546777 Issued on October 15, 1985. Estimated Expiration Date:

February 23, 2004. 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.

Abstract Claims Description Full Text

Patent References

3030946

3280317

Method for measuring heart beat rate and circuit means for same
Patent #: 4248244
Issued on: 02/03/1981
Inventor: Charnitski , et al.

Heartbeat monitoring process and device Patent #: 4250888
Issued on: 02/17/1981
Inventor: Grosskopf

Inventors

Assignee

Siemens Gammasonics, Inc.

Application

No. 06/583083 filed on 02/23/1984

US Classes:

600/528Detecting heart sound

Examiners

Primary: Kamm, William E.

Attorney, Agent or Firm

Moran; John Francis

International Classes

A61B 5/0456 (20060101)
A61B 5/024 (20060101)
A61B 5/0452 (20060101)
A61B 7/04 (20060101)
A61B 7/00 (20060101)

Abstract

From 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. For diagnostics synchronization signals developed exclusively from the heart sound signals are used to validate data from diagnostic equipment such as a gamma camera.