Diagnostic method for high sensitivity detection of component concentrations in human gas emissions
US7004909B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2001 |
| Grant date | Feb 28, 2006 |
| Priority date | — |
| Expiry date | Jan 12, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2010/0087
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for detecting component concentrations in human gas emissions such as breath and gas emitted from skin. A gas sample containing a specified component is collected into a gas cell using a pump and a series of valves to draw the gas sample into the cell and control the gas pressure within the cell. A tunable optical radiation beam is passed through the gas cell and the amount of energy absorbed by the specified component may be measured indirectly by taking the difference between the incident and emerging beam energy or directly by optoacoustic methods. Concentrations of the specified component as small as 0.1 ppB may be determined. Additionally, the tunable optical radiation beam may be multiplexed for use with a plurality of systems utilizing the beam for medical purposes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.