Respiratory device
US4693256A · kind A · utility
10Cited by
12References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1982 |
| Grant date | Sep 15, 1987 |
| Priority date | — |
| Expiry date | Jun 28, 2002 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/091
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A spirometer is provided which has a cylinder with a piston slidable in the cylinder. A pair of orifices from the atmosphere to the opposite sides of the piston are provided, the resistance to air flow through them being in a predetermined ratio. A tube is provided for connecting the mouth of a patient to one side of the piston chamber for effecting movement of the piston during inhalation or exhalation. The cylinder is provided with indicia representing units of air volume inhaled or exhaled with the volume of the cylinder being substantially smaller than the volume of air indicated by the spirometer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.