SPIROMETER

摘要

A turbine spirometer (1) comprises a breathing tube (13) into which is subject is to breath and a vane (9) to be driven by the subject's breath. The breathing tube (13) has a first axis A-A at its opening (21) in the direction of air flow and the vane (9) rotates about a second axis B-B, (11). The first A-A and second B-B axes are inclined to one another at angle of around 100 degrees such that in use the axis of rotation B-B is substantially vertical.