| 20080249429 | Spirometers - A portable hand-held spirometer apparatus is described. A main casing has a pair of opposed arms extending to one side thereof. A flow head component unit has a channel through which air may be blown, with formations in the channel imparting a rotary movement to air blown through the channel. A free-spinning vaned member is mounted for rotation about an axis substantially coaxial with that of the channel. The flow head component unit has two open-ended recesses extending to either side of the vaned member and dimensioned to receive the opposed arms when the flow head component unit is fitted on to the main casing. This construction enables the successive use of detachable flow head components, each may be used once and then a batch of which may be sterilized before re-use. | 10-09-2008 |
