Apparatus for measuring the oxygen uptake of a person

Details Apparatus for measuring the oxygen uptake of a person Apparatus for measuring the oxygen uptake of a person

1986-03-18

1988-06-28

Howell, Kyle L.

Surgery

Truss

Pad

128719, 12820515, A61B 508

Patent

active

047532459

ABSTRACT:
Apparatus for measuring the oxygen uptake of a person connected to a respirator (23) includes a closed container (1) of variable volume. The container (1) can be connected to the respiratory passages of the person, via an inspiration line (2) and an expiration line (3), so that the person can inspire from and expire to the container (1). One of the lines incorporates a carbon dioxide absorber (19) for removing carbon dioxide from the respiratory gas. Means (17,18) are provided for monitoring the volume of the container (1), and controllable means (8,9,10) are found for supplying pure oxygen gas to the container (1). The oxygen-gas supply means (8,9,10) are so controlled by the means (17,18) monitoring the volume of the bellows (1) that the volume of the bellows at a given predetermined point in the breathing cycle of the person connected to the apparatus is held substantially unchanged. Means are also provided for determining the amount of oxygen gas supplied to the container (1) herewith. The interior of the container (1) is connected to the respirator (23), via a line (11) incorporating closure means (12), so that prior to the actual measuring process the person connected to the apparatus obtains assistance in breathing from the respirator via the interior of the container (4) and the volume of gas therein assumes a state of equilibrium with respect to temperature and relative humidity prior to commencing the measuring operation. The variable container (1) is enclosed in an outer, rigid vessel (13), the interior of which communicates with the respirator (23), so as to provide requisite breathing assistance during the actual measuring process. (FIG. 1).

REFERENCES:
patent: 2592694 (1952-04-01), Heidbrink
patent: 4231362 (1980-11-01), Pearson et al.
Leach, Science, Mar. 15, 1946, vol. 103, No. 2672, pp. 341-342.

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