Capnometer
US6267928A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1998 |
| Grant date | Jul 31, 2001 |
| Priority date | — |
| Expiry date | Jul 9, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/204998
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.sub.2 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.