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:
Jul. 31, 2001
Filed:
Jul. 09, 1998
Shinji Yamamori, Tokyo, JP;
Hidehiro Hosaka, Tokyo, JP;
Kohei Ono, Tokyo, JP;
Masami Ito, Tokyo, JP;
Masayuki Inoue, Tokyo, JP;
Masaki Sugiura, Tokyo, JP;
Noriaki Todokoro, Tokyo, JP;
Yoshinobu Nakae, Tokyo, JP;
Nihon Kohden Corporation, Tokyo, JP;
Abstract
A method and apparatus for applying infrared radiation to a respiratory gas and detects a signal associated with the quantity of transmitted radiation for measuring the concentration of CO,in the respiratory gas. The capnometer detects a maximum value of the detection signal from the thermal detector during the present inspiration phase, stores the detected maximum value in RAM, performs the first approximation, Kalman filtering or some other suitable method to compute a corrected value that is valid for the time being until a maximum value is detected in the next inspiration phase, and determines a density signal by calculating the difference between the corrected value and the detection signal.