Respirators and control methods for respirators

Abstract

The present invention relates to a respirator having a respiratory tube connection for connecting a respiratory tube, an actuator which is pneumatically connected to the respiratory tube connection for discharging air via the respiratory tube connection to a patient, a breathing sensor connection for a respiration sensor for supplying a breathing sensor signal, and a programmable digital controller. The controller calculates a lung volume signal from the respiratory signal and an inhaled volume and an exhaled volume on the basis of the lung volume signal for each breath. The controller further determines when the exhaled volume exceeds the associated inhaled volume by an adjustable value and then increases the pressure at the end of the expiration. In another embodiment, the pressure is increased at the end of the expiration when the oxygen saturation falls below a lower threshold value. In a further embodiment, it is determined whether the oxygen saturation falls below a lower threshold value. In this case, a backup ventilation with a predetermined frequency is started. The frequency of the backup ventilation is reduced when the oxygen saturation again exceeds the lower threshold value. In a further embodiment, the backup ventilation is terminated when the oxygen saturation exceeds an average threshold value. The invention further relates to corresponding control methods.

Description

technical field [0001] The field of the invention includes respirators of the type mentioned in the preambles of claims 1 , 3 , 5 and 7 , and control methods of the type mentioned in the preambles of claims 10 , 12 and 15 . [0002] EP 2091429 B1 discloses a respirator according to the preambles of claims 1 and 9 . [0003] The present invention relates to the field of respirators and control methods thereof, in particular to respirators considering the oxygen saturation in blood measured by an oximeter. Background technique [0004] It is well known that mechanically ventilated respirators produce various forms of oxygen deficiency. (Roche Lexikon Medizin, 4 th ed., Urban & Fischer Verlag, Munich). This type of respirator is also known as a ventilator. There are three basic types: [0005] a) Pressure-controlled respirators: the inspiratory phase is terminated when a predetermined breathing pressure is reached in the device. Exhalation is mostly passive. [0006] b)...

AI Technical Summary

Problems solved by technology

Other flow modes, such as deceleration, acceleration, and sinusoidal flow, are practically no longer used in volume-controlled ventilation, as they do not provide any conceivable benefit

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