Respirator having improved synchronicity during the transition from expiratory to inspiratory operation

Abstract

The invention relates to a respirator (10) for the at least supportive respiration of living beings (12), wherein the respirator comprises the following: a connection formation for connection to a breathing gas supply; a breathing gas conduit arrangement (30); a pressure change arrangement (16) for changing the pressure in the breathing gas conduit arrangement (30); a flow sensor (44), which provides a flow signal (50) representing a breathing gas volume flow in the breathing gas conduit arrangement (30), a control unit (18) controlling the operation of the respirator (10). Said control unit is designed to trigger a transition from an expiratory to an inspiratory operation of the respirator (10), whenever an increase in the steepness of a flow signal curve (50) exceeds a steepness change threshold value (58). According to the invention, the control unit (18) is configured to detect the steepness change threshold value (58) depending on an expiratory time constant of the respective patient (12) to be ventilated, and to trigger the transition from an expiratory to an inspiratory operation of the respirator (10), whenever the increase in the steepness of the flow signal curve (50) exceeds the steepness change threshold value (58) determined in accordance with the expiratory time constant.

Description

technical field [0001] The present invention relates to a respirator for at least assisting the respiration of a living being breathing in a healthy state, wherein the respirator comprises: [0002] - forming a connection for connection with a breathing gas reservoir; [0003] - a breathing gas line device which, during the inspiratory operation of the respirator, guides the freshly inhaled breathing gas from the forming connection to the patient interface and during the expiratory operation catabolizes the The exhaled breathing gas is directed away from the patient interface; [0004] - a pressure changing device for changing the pressure of the breathing gas in the breathing gas-line set; [0005] - a flow sensor constructed and arranged to provide a flow signal indicative of the breathing gas flow of at least the exhaled breathing gas in the breathing gas-line-device; [0006] - a control device for controlling the operation of the respirator, the control device being co...

AI Technical Summary

Problems solved by technology

The disadvantage of this standard is that it basically works satisfactorily only in patients with a healthy respiratory system, whereas when patients with chronic obstructive pulmonary disease (COPD patients) show spontaneous breathing during artificial respiration, in said Uncomfortable asynchrony for the patient during rescue respiration

[0017] Furthermore, if the patient with an intact respiratory system and the COPD patient are to breathe through the same respirator operating according to EP 0 521 314 A1, the predetermined slope-change threshold used here is always a compromise, which Should be available for all patients and in individual cases may lead to asynchrony in the breathing, since the respective patient to be breathing is only suitable to a limited extent for the situation on which the predetermined slope-change threshold is based

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