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:
Feb. 23, 1999
Filed:
Apr. 07, 1997
Tomohiro Mogi, Koganei, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
A sensitivity setting device and an electrocardiograph which includes the sensitivity setting device include a differential amplifier whose amplification factor is changed by a CPU and a CR differentiator connected to the differential amplifier for providing an appropriate electrocardiogram waveform. The CR differentiator includes capacitor and two parallel resistors connected with the capacitor with one of the resistors being connected to an analog switch which is switched on/off by the CPU. If there is an input electrocardiogram waveform from a pair of electrodes attached to a patient's body directly after the measurement of the electrocardiogram waveform, the electrocardiogram waveform is amplified with an initial set amplification factor by the differential amplifier and the resulting signal is inputted to the CR differentiator. When the analog switch is switched on to reduce the CR time constant of the CR differentiator, an accurate electrocardiogram waveform is picked up and an appropriate sensitivity is obtained from the amplitude of the picked-up electrocardiogram waveform. A corresponding amplification factor is then set in differential amplifier, the analog switch is switched off, and the electrocardiogram waveform is measured with the appropriate time constant.