PROCESS AND DEVICE FOR LUNG VENTILATION
First Claim
1. A process for lung ventilation, comprising:
- providing a combination of an electric impedance tomography (EIT) system, a computing unit and a respirator;
recording a first status image of healthy lungs with the EIT system;
determining, with the computing unit, a total area and/or a spatial distribution of ventilated lung areas from image values;
recording second or additional status images after assumed lung damage and after the total area and/or the spatial distribution of ventilated lung areas are determined;
comparing, with the computing unit, the total areas and/or the spatial distribution of the ventilated lung areas from the first and second or further status images and analyzing for the presence of lung areas that have no or reduced ventilation due to atelectases;
sending information on the presence, the extent and/or the spatial distribution of atelectases by the EIT system to the respirator;
increasing the respiration pressure step by step, with the respirator, as a function of the status image or the currently determined status images until the current image of the lung status corresponds to the first status image or comes close to the first status image with minimal deviations; and
reducing the respiration pressure step by step, with the respirator, until the computing unit detects a reduction of the ventilated lung areas and subsequently increasing the respiration pressure, with the respirator, to the last value at which no change occurred in the ventilated lung areas.
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Accused Products
Abstract
A process and a device is presented with an electro-impedance tomography (EIT) system (2), with a computing unit (4) and with a respirator (1) for gentle mechanical lung ventilation especially in case of atelectases following surgical procedures. A first image of the healthy lungs is first recorded prior to anesthetization by means of the EIT system (2) and the total area and/or the spatial distribution of ventilated lung areas are determined from the image values by means of the computing unit (4). Second or additional status images are recorded after assumed lung damage and the total area and/or the spatial distribution of ventilated lung areas are determined. The total areas and/or the spatial distribution of the ventilated lung areas from the first and second or further status images are compared by means of the computing unit (4) and analyzed for the presence of lung areas that have no or reduced ventilation due to atelectases. The information on the presence, the extent and/or the spatial distribution of atelectases is sent by the EIT system (2) to the respirator (1) so that the respiration pressure is increased step by step by the respirator (1) as a function of the status image or the currently determined status images until the current image of the lung status corresponds to the first status image or comes close to it with minimal deviations. The respiration pressure is subsequently reduced again step by step by the respirator (1) until the computing unit (4) detects a reduction of the ventilated lung areas and the respiration pressure is subsequently increased again by means of the respirator (1) to the last value at which no change occurred in the ventilated lung areas.
12 Citations
8 Claims
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1. A process for lung ventilation, comprising:
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providing a combination of an electric impedance tomography (EIT) system, a computing unit and a respirator; recording a first status image of healthy lungs with the EIT system; determining, with the computing unit, a total area and/or a spatial distribution of ventilated lung areas from image values; recording second or additional status images after assumed lung damage and after the total area and/or the spatial distribution of ventilated lung areas are determined; comparing, with the computing unit, the total areas and/or the spatial distribution of the ventilated lung areas from the first and second or further status images and analyzing for the presence of lung areas that have no or reduced ventilation due to atelectases; sending information on the presence, the extent and/or the spatial distribution of atelectases by the EIT system to the respirator; increasing the respiration pressure step by step, with the respirator, as a function of the status image or the currently determined status images until the current image of the lung status corresponds to the first status image or comes close to the first status image with minimal deviations; and reducing the respiration pressure step by step, with the respirator, until the computing unit detects a reduction of the ventilated lung areas and subsequently increasing the respiration pressure, with the respirator, to the last value at which no change occurred in the ventilated lung areas. - View Dependent Claims (2, 3, 4)
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5. A device for lung ventilation, the device comprising:
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an electric impedance tomography system for recording a first image of the lung status and for recording a second or additional images of the lung status subsequent to one another over time from measured impedance changes and to determine a total area and/or a spatial distribution of ventilated lung areas; a computing unit; a respirator for increasing respiration pressure or increasing respiration volume, by signals received from the electric impedance tomography system, step by step until the current image of the lung status corresponds to the first status image or comes close to the first status image with minimal deviations, and for subsequently reducing the respiration pressure or the respiration volume step by step until the computing unit detects a reduction of the ventilated lung areas and to subsequently increase the respiration pressure and the respiration volume again to the last value at which there was no change in the ventilated lung areas. - View Dependent Claims (6, 7, 8)
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Specification