Respiratory calorimeter
US6309360A · kind A · utility
Inventor
Key dates
| Filing date | Jan 16, 1998 |
| Grant date | Oct 30, 2001 |
| Priority date | — |
| Expiry date | Jan 16, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/029
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An indirect calorimeter for measuring the subject's oxygen consumption per unit time employs a mouthpiece through which the subject breathes for a period of time. Conduits connect the mouthpiece to a flow meter and a capnometer so that the subject's inhalations and exhalations pass through the flow meter and the exhalations also pass through the capnometer. Electrical signals from the flow meter and capnometer are provided to a computer which calculates the CO.sub.2 exhaled by the subject during the test by integrating the instantaneous CO.sub.2 content of an exhalation as measured by the capnometer over the volume as measured by the flow meter and subtracts that quantity from the exhaled volume and subtracts their difference from the inhaled volume. In alternative embodiments the system can also measure the subject's Cardiac Output and Delivered Oxygen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.