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:
May. 03, 1983
Filed:
Feb. 27, 1981
David W Douglas, Lenexa, KS (US);
Other;
Abstract
An apnea monitor having a capacitance type transducer pad providing a signal indicative of respiration. The resilient dielectric material between the capacitor plates is formed in two layers with the upper layer having a lesser spring constant to make the pad more sensitive around the periphery of the body to respond to respiratory motion while rejecting cardiovascular motion. The transduced signal is monitored and its gain is automatically adjusted to compensate for long term instability by a gain-set circuit arrangement having a time delay to assure that changes in the signal are not caused by apnea. A control voltage generated by the circuit operates the alarm without excessive time delay and is also used to provide a gain-set voltage for adjustment of the signal gain.