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:
Mar. 18, 1986
Filed:
Sep. 17, 1984
Gianni Plicchi, Bologna, IT;
Giancarlo Canducci, Bologna, IT;
Other;
Abstract
A low electric energy consumption circuit to detect parameters associated to the patient's respiration, suitable for the realization of implantable devices, such as implantable and physiologic pacemakers, is designed to detect, at the same sample rate of the impedance in a part of the patient's body, the voltage variations V (.DELTA.ZL) corresponding to said impedance with both negative and positive variations from the base line. According to a first scheme, these variations V' (.DELTA.ZL) are subsequently processed by means that produce a clean V.sub.OUT signal, e.g. a squared one, which shows a transition every time that the difference between minimum value and maximum value and maximum value and minimum value of the input signal exceeds a fixed a preferably programmable value. According to a second scheme, said variations V' (.DELTA.ZL) are processed by means producing a signal proportional to the variation speed of the body impedance and by means producing a signal Vm (.DELTA.ZL) that is the mean value or the average of the values of the input signal and that is proportional to the patient's pulmonary ventilation (l/min).