Apparatus for monitoring cardiac activity via ECG and heart sound signals

Patent 4548204 Issued on October 22, 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

3385289

3426151

3742938

3913567

Ambulatory electrocardiographic recorder Patent #: 4183354
Issued on: 01/15/1980
Inventor: Sibley , et al.

Inventors

Assignee

Siemens Gammasonics, Inc.

Application

No. 06/583086 filed on 02/23/1984

US Classes:

600/513, Detecting heartbeat electric signal and diverse cardiovascular characteristic128/904TELEPHONE TELEMETRY

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 monitoring remotely or by a using recording, an ECG signal is modulated and combined with the associated heart sound signal for use as a single combined signal.