Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1981-06-02
1983-12-20
Recla, Henry J.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820418, A61M 1600
Patent
active
044211139
ABSTRACT:
For the purpose of carrying out an MMV-treatment (Mandatory Minute Volume) by means of a lung ventilator which includes a breathing-gas source from which a patient connected to the ventilator is able to breath spontaneously through an inspiratory line, and a ventilator unit which can be activated by means of a control signal so as to deliver to the patient through the inspiratory line a mandatory breath of determinable tidal volume from the breathing-gas source, the flow of breathing gas through the inspiratory line is continuously sensed by means of a flow meter. In a control unit there is generated a signal which is representative of the continuous integral of the difference between a reference signal and the flow signal from the flow meter. The value of the integrated difference signal is compared with a given limit value. Each time the value of the integrated difference signal reaches the limit value, the ventilator unit is activated to deliver to the patient a mandatory breath of given tidal volume. Alternatively, the ventilator unit may be arranged to deliver to the patient mandatory breaths of a constant given frequency and of a tidal volume, whose magnitude is determined with each mandatory breath, by the difference prevailing between the value of the integrated difference signal and the limit value.
REFERENCES:
patent: 3923056 (1975-12-01), Bingmann
patent: 4281651 (1981-08-01), Cox
Gedeon Andras
Lundell Ulf
Pilenvik Goran
Engstrom Medical Aktiebolag
Recla Henry J.
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