Method for the determination of a gas component content in the r

Details Method for the determination of a gas component content in the r Method for the determination of a gas component content in the r

1989-08-29

1991-09-24

Green, Randall L.

Surgery

Truss

Pad

128720, 128725, A61B 508

Patent

active

050506153

ABSTRACT:
The invention relates to a method for the determination of the content of one or a plurality of gas components, e.g. carbon dioxide, present in the respiratory gas of a patient, especially in small children whose respiration is characterized by a high respiration frequency and a small respiration volume. The method is based on sucking, e.g. by means of a pump (8), into a tube (5) samples of the respratory gas of a patient from the phase of a respiratory cycle that is considered appropriate. In the determination of carbon dioxide content, the sampling is preferably effected as of the instant at which a flow reversal detector (4) fitted in tube (2) detects that a patient is inhaling or when the corresponding reverasl of flow has been detected in a respirator (3). In the determination of carbon dioxide content, the sampling must be stopped before the boundary zone of fresh incoming gas and exhaled gas, in inhalation reaches the end of sampling tube (5). Immediately after the preceding sample it is possible to suck into tube (5) the samples picked up from the following respirartory cycles. Thus, there may be a plurality of samples in successive order in tube (5) prior to their arrival at a gas component content measuring element (6).

REFERENCES:
patent: 3661528 (1972-05-01), Falk
patent: 3910261 (1975-10-01), Ragsdale
patent: 4248245 (1981-02-01), Kempin
patent: 4361027 (1982-11-01), Schmitt
patent: 4619269 (1986-10-01), Cutler et al.
patent: 4799374 (1989-01-01), Bossart et al.
patent: 4799394 (1989-01-01), Barnett et al.
patent: 4800763 (1989-01-01), Hakkers et al.

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