The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 1987
Filed:
Jun. 10, 1986
Mark W Kroll, Rogers, MN (US);
Cherne Industries, Inc., Minneapolis, MN (US);
Abstract
A method and apparatus for deriving weak cardiac sounds by automatically cancelling lung sounds. The process is accomplished by providing a pair of acoustic sensors about the thorax of a patient, the first being disposed on the precordial region, adjacent to the sternum, and the second on the axillary region; obtaining sound signals from each sensor; amplifying the axillary signal by a predetermined factor; and subtracting the amplified signal from the precordial signal. An acoustic transmitter is placed on the axillary region opposite the axillary sensor. Sound waves of predetermined frequencies are emitted from the axillary transmitter to determine and compensate for phase shifts due to the electronic circuitry and the patient body. The apparatus of the present invention comprises a first acoustic sensor, a second acoustic sensor, an acoustic transmitter, a strap, transmitting cables, a processor, a cathode-ray tube, a printer, and headphones.