Apparatus for beat buffering techniques varified by arrhythmias detection for stopaction frames of cardiac function

Patent 4649930 Issued on March 17, 1987. Estimated Expiration Date:

July 1, 2005. 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

3581735

Method and apparatus for multiplexing of physiological sensor signals with gamma ray camera data signals
Patent #: 4033335
Issued on: 07/05/1977
Inventor: Nickles

Arrhythmia rejection circuit for gated cardiac image display systems Patent #: 4245647
Issued on: 01/20/1981
Inventor: Randall

Inventors

Assignee

Siemens Gammasonics, Inc.

Application

No. 06/750632 filed on 07/01/1985

US Classes:

600/508, Heart600/519, Detecting signal repetition rate600/528Detecting 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.