Breathing gas analyzer
US3996010A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1976 |
| Grant date | Dec 7, 1976 |
| Priority date | — |
| Expiry date | Mar 25, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/083
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A breathing gas analyzer, especially for pulmonary use, has a frame supporting a centrally mounted radiation or analyzing chamber of about 1 and one-half to 25 millimeters (0.06 to 1.0 inches) substantially uniform inside diameter, having a circular-cylindrical transparent wall with closed ends connected in an electrical circuit and providing an anode of brass or stainless steel and a cathode of tantalum and constituting a discharge tube. Leading from a patient's breathing tube is a conduit passing axially through the cathode, the conduit having an inside diameter of about 0.03 to 0.25 inches (0.7 to 6.4 millimeters). The chamber is subjected to subatmospheric pressure of about 0.2 to 10.0 torr through a duct from about one thirty-second to one-quarter inches (0.8 to 6.4 millimeters) inside diameter, passing through the anode to a vacuum pump. Arrayed equidistantly from the axis and around the chamber are one or more radiation detection devices positioned opposite the negative glow region of the discharge. The detection devices may be connected to a display device. There are individual apertures and filters interposed between the chamber and each of the detecting devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.