Process and device for controlling artificial respiration
AssigneeSynthelabo
InventorsLuc Caillot, Claude Chopin
Life of this patent
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Abstract
The stopping or starting of the respirator (1) is controlled by a module (11) receiving, from a capnograph (8), an electric signal representing the CO.sub.2 content of the gas passing through a CO.sub.2 analysis cell (6) fixed to the exit of the intubation tube, inserted after tracheotomy, of a patient under assisted respiration. It is the CO.sub.2 content which determines the starting or stopping of the assistance by the respirator.
Claims7
Process for controlling the starting and stopping of an artificial respirator on a patient assisted by the artificial respirator during a surgical intervention of the patient's respiration and for allowing the patient progressively to recover his capability to breath alone at the end of the surgical operation, characterised in that the starting and stopping of the respirator are controlled as a function of the CO.sub.2 content measured at the end of each expiration, FCO.sub.2ET, of the gas exhaled by the patient, such that the respirator is turned on when the CO.sub.2 content measured at the end of each expiration is outside of predetermined upper and lower limits for a predetermined period of time to provide controlled ventilation for the patient, and turned off when the CO.sub.2 content measured at the end of each expiration is within said limits to provide for spontaneous ventilation of the patient.
Device for controlling the starting and stopping of an artificial respirator for a patient who had been completely assisted by the artificial respirator, and for helping the patient to recover natural respiration, comprising:
- an artificial respirator (1) with an inhalation line (3) and an exhalation line (4), a line common to both said inhalation and exhalation lines, a cell (6) for analysing the CO.sub.2 content of the gas which passes through it, said cell being placed in said line common to inhalation and to exhalation, a control module (11), and a capnograph (8) coupled between the cell and the control module and converting the signals received from the cell in order to deliver converted signals to said control module, said control module (11) being coupled between the capnograph and the respirator and receiving these signals from the capnograph in order to control the starting and stopping of the respirator, the module being arranged so as to control the starting and stopping of the respirator as a function of the CO.sub.2 content, measured at the end of each exhalation, of the gas exhaled, such that the respirator is turned on when the CO.sub.2 content measured at the end of each expiration is outside of predetermined upper and lower limits for a predetermined period of time to provide controlled ventilation for the patient, and turned off when the CO.sub.2 content measured at the end of each expiration is within said limits to provide for spontaneous ventilation of the patient.
Dependencies are inferred from the claim text.