Hamilton Medical Ag

Marc Wysocki

Josef X Brunner

Thomas Laubscher

Dominik Novotni

Ivo Mettier

Gion Durisch

Ricardo Lopez Gasco

The invention relates to a device for the regulation of PEEP and FiOof a ventilator for achieving an arterial oxygen partial pressure in the blood of a mechanically ventilated patient. At reading which is representative of the success of the oxygen supply, i.e. the oxygen saturation of the blood is measured with the device, and assigned to one of three regions, which are defined by two characteristic lines. A first control loop is designed to optimise PEEP and FiOon assigning a reading to a region which demands a change of the settings, or to retaining the settings with an assignment to the normal region between the characteristic lines. This first control loop carries out such an optimisation at predefined temporal intervals on account of the representative reading (SaO) and a predefined necessary supply intensity. The ventilator is subsequently activated accordingly. Therebetween, if necessary only FiOis increased or reduced with a second control loop, if between optimisations by way of the first control loop, the current representative value (SaO) falls below a limit value (characteristic line) which is dependent on the supply intensity, which demands an immediate increase of the oxygen supply.

O-controller

The invention relates to a device, with which one is to prevent a patient who breathes on Ms own and who desires a lower CO-partial-pressure than is achieved by the set Ventilation from tiring. It comprises the following means for the regulation of a changing intensity of a mechanical Ventilation: &#x2022; means for determining a target frequency RR, &#x2022; means for determining a spontaneous frequency RR&#x2022; means for comparing the spontaneous frequency RRwith the target frequency RR. wherein adapting a Ventilation target value (% MinVol, V') on account of the result of the comparison of the spontaneous frequency RRwith the target frequency RRand &#x2022; means for adapting the parameters determining the intensity of the Ventilation, on account of the Ventilation target value (% MinVol, V&#x2032;). This so-called pump support System (PSS) is activated (PSS on) when the patient breathes in an adequately spontaneous manner (Criterion 1). With an insufficient individual activity of the patient, his behavior is taken as a basis for the control of the regulation. The control or regulation of the Ventilation is assumed by a fixed setting of a Ventilation target value (% MinVol), or a CO-controller, as soon as the patient breathes in a manner which is not spontaneous enough.

Apparatus for regulating a mechanical ventilation

The invention relates to an apparatus with sensing means suitable for sensing the inspiratory phase and the expiratory phase of each respiratory cycle of a respirated person from in each case at least one minimum and maximum amplitude of a circulation value within a single respiratory cycle, and with a computing device for calculating a variation of the amplitudes of the circulation value occurring within a said respiratory cycle. It is distinguished by the fact that the computing device is set up to assign each amplitude of the circulation value either to the inspiratory phase or to the expiratory phase and to determine the one extreme amplitude of the circulation value from the amplitudes assigned to the inspiratory phase and the other extreme amplitude of the circulation value from the amplitudes assigned to the expiratory phase, and to ascertain from the amplitude variation between the extreme amplitudes in the two phases of the respiratory cycle whether the haemodynamic stress caused by the assisted breathing is too high.

Apparatus for assessing the stress on the circulation of a person during assisted breathing by means of a respirator

The invention relates to a device for the automated determination of the PEEP of a patient. Said device comprises sensors and a suitable electronic system for determining a pressure-volume characteristic curve during a P/V maneuver. The electronic system is designed in such a way as to generate, specifically in terms of breathing pressure, the difference between 'lung volume during exhalation (Vdef)' and 'lung volume during inhalation (Vinf)', and to determine the maximum value of said difference. The breathing pressure is then determined, for which the volume difference has a value defined in relation to the maximum value of the volume difference. The device calculates a PEEP value on the basis of said determined breathing pressure value.

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Chevreves, France

Marc Wysocki