Method and apparatus for sensing flow in two directions and automatic calibration thereof
US5469750A · kind A · utility
92Cited by
11References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1993 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Jan 29, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/8212
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method of calibrating the output of a transducer in a flow path through which a medication is delivered from a hand-held metered dose inhaler is disclosed. The transducer senses flow rates of human breath during inhalation and exhalation through a portion of a flow path in the inhaler. The flow rates have two non-linear flow characteristics in opposite directions. The flow path portion provides flow rate measurements representative of flow paths of the entire system. The method makes it possible to precisely calibrate so that precise doses of medication can be repeatedly delivered to a patient by inhalation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.