Apparatus for measurement of expired gas concentration in infants
First Claim
1. In an apparatus for measuring expired gas concentrations of a patient, an airway adapted to be placed in communication with the patient'"'"'s respiratory system, pump means having its intake connected to said airway for drawing a predetermined volume of gas therefrom to be sampled, a captive bag assembly having an outer chamber and a captive bag within said outer chamber, the interior of said captive bag defining an inner chamber, the exhause of said pump means being connected to one of said chambers and the other of said chambers being connected to said airway whereby the captive bag assembly replenishes the gas to the airway in the same predetermined volume and simultaneously with the operation of said pump means to draw gas therefrom.
2 Assignments
0 Petitions
Accused Products
Abstract
Apparatus for measuring expired gas concentration in infants whose breathing rate is too high for normal analyzers by sampling the breath, for instance from the tube between the respirator and the infant, and drawing that sample of gas into an elongated, small diameter tube which serves to store the sample in a linear array substantially without intermixing. Several breaths are thus stored after which time the sampling may be interrupted and the stored gas drawn slowly through a gas analyzer.
48 Citations
10 Claims
- 1. In an apparatus for measuring expired gas concentrations of a patient, an airway adapted to be placed in communication with the patient'"'"'s respiratory system, pump means having its intake connected to said airway for drawing a predetermined volume of gas therefrom to be sampled, a captive bag assembly having an outer chamber and a captive bag within said outer chamber, the interior of said captive bag defining an inner chamber, the exhause of said pump means being connected to one of said chambers and the other of said chambers being connected to said airway whereby the captive bag assembly replenishes the gas to the airway in the same predetermined volume and simultaneously with the operation of said pump means to draw gas therefrom.
- 5. In an apparatus for measuring expired gas concentrations of an infant, an airway adapted to be placed in communication with the infant'"'"'s respiratory system, an elongated tube, pump means in communication with said elongated tube for pumping respiratory gas therethrough, a gas analyzer, valve means having a first position placing said elongated tube in communication with said airway whereby gases from the respiratory system of the infant may be drawn into said elongated tube by said pump means, said valve means having a second position placing said elongated tube in communication with said gas analyzer whereby gases previously drawn into said elongated tube while the valve means was in its first position may be analyzed when said valve means is in its second position.
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10. Apparatus for measuring expired gas concentrations of a patient comprising pumping means adapted to be placed in communication with the airway of the patient for drawing a sample of the patient'"'"'s respiratory gases, storage means in communication with said pumping means for storing the drawn respiratory gases in a sequence corresponding to the sequence that the gases are expired by the patient, a gas analyzer for analyzing said gases and valve means for interrupting the communication between said storage means and the airway of the patient and for simultaneously placing said storage means in communication with said gas analyzer.
Specification