Process and device for signaling malfunctions of a respirator
First Claim
1. A process for signaling malfunctions of a respirator with single source of energy constituted by the source of respiratory gas under pressure of the respirator, which makes it possible to apply a pulsatory insufflation pressure to a patient to whom it is connected, in which said pulsatory insufflation pressure is compared with an adjustable threshold value (Ps) and an alarm is triggered off if the difference between the maximum value of this pressure and said threshold exceeds a predetermined quantity either by excess or by want,said process comprising the following steps of:
- creating a pneumatic signal formed by pulses which coincide with the periods when the insufflation pressure is greater than said threshold (Ps), anddetecting the appearance of an excessive difference between the maximum value of this pressure and the threshold by observing the difference between a representative parameter of said pulses and a predetermined normal value (tn, an) of this parameter, this value being adjustable.
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Accused Products
Abstract
This invention relates to the monitoring of the correct operation of a respirator with single source of energy constituted by a cylinder of pressurized oxygen, to which is annexed a device for connection to a patient. Such monitoring is effected with the aid of a pneumatically operating device which comprises a comparator with adjustable threshold, connected to the mask for connecting to the patient and followed by an amplifier whose output signal takes the binary logic level 1 during the time when the insufflation pressure in the mask is greater than said threshold, and takes the other binary logic level 0 in the opposite case, and a circuit for processing this signal, which triggers off an alarm device if the duration of the time intervals when this latter is at level 1 is too long or too short with respect to a predetermined normal value.
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Citations
18 Claims
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1. A process for signaling malfunctions of a respirator with single source of energy constituted by the source of respiratory gas under pressure of the respirator, which makes it possible to apply a pulsatory insufflation pressure to a patient to whom it is connected, in which said pulsatory insufflation pressure is compared with an adjustable threshold value (Ps) and an alarm is triggered off if the difference between the maximum value of this pressure and said threshold exceeds a predetermined quantity either by excess or by want,
said process comprising the following steps of: -
creating a pneumatic signal formed by pulses which coincide with the periods when the insufflation pressure is greater than said threshold (Ps), and detecting the appearance of an excessive difference between the maximum value of this pressure and the threshold by observing the difference between a representative parameter of said pulses and a predetermined normal value (tn, an) of this parameter, this value being adjustable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for signaling malfunctions of a respirator with a single source of energy constituted by the source of respiratory gas under pressure of the respirator, to which is annexed a device for connection to a patient,
wherein it is entirely composed of pneumatically operating elements and comprises a comparator with adjustable threshold (Ps), connected to the device for connection to the patient and followed by an amplifier of which the output signal takes a first binary logic level (1) during the time when the insufflation pressure at the connecting device is higher than said threshold (Ps), and takes the other binary logic level (0) in the contrary case, and a circuit for processing this output signal, which detects the duration of the time intervals when the latter is at the first level (1) and triggers off an alarm if this duration is too long or too short with respect to a predetermined normal value.
- 14. A device for signaling malfunctions of a respirator with single source of energy constituted by the source of respiratory gas under pressure of the respirator, to which is annexed a device for connection to a patient, wherein it is entirely composed of pneumatically operating elements and comprises a comparator with adjustable threshold (Ps), connected to the device for connection to the patient and followed by an amplifier of which the output signal has a variable amplitude, and a circuit for processing this output signal, which detects the value of the amplitude of this latter with respect to a normal level (an) and triggers off an alarm if this value is too high or too low with respect to this predetermined normal level.
Specification