Capnometer
US5728585A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1996 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | Feb 26, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/204998
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A capnometer is disclosed with a light sourse for irradiating a respirtory gas, a thermal detector for sensing the transmission of the infrared radiation, a switch device for turning the radiation source on and off in a predetermined period, a memory device for storing output from the thermal deterctor, and a control device for picking up a maximum value of the detection signal from the thermal detector for the present inspiration phase. The maximum value is stored in the memory device and the difference is calculated between a subsequently issued detection signal and the stored maximum value to compensate for drift that has occurred in the thermal detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.