Spirometer

Details Spirometer Spirometer

1974-12-11

1976-04-13

Kamm, William E.

Surgery

Truss

Perineal

73194R, A61B 508

Patent

active

039497399

ABSTRACT:
A spirometer has a source of bias gas directly connected to a flow measurement passage so part of the bias gas flows through the flow measurement passage to the atmosphere instead of flowing through a breath transmission passage. In one embodiment, gas storage chamber is disposed between the breath transmission passage and the flow measurement passage so the gas stored in the chamber enters the flow measurement passage before a patient's breath from the breath transmission passage; the source of bias gas supplies the storage chamber. In another embodiment, a T-network has a first branch conduit connected to the source of gas, a second branch conduit connected to the breath transmission passage, and a third branch conduit connected to the atmosphere; the third branch conduit serves as the flow measurement passage.

REFERENCES:
patent: 3343413 (1967-09-01), South et al.
patent: 3395699 (1968-08-01), Beasley
patent: 3403556 (1968-10-01), Koester
patent: 3429323 (1969-02-01), Mott
patent: 3709213 (1973-01-01), Yard
patent: 3735752 (1973-05-01), Rodder
patent: 3817238 (1974-06-01), Matson

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