Drãgerwerk Ag & Co, Kgaa

Dråger Medical Ag & Co. Kg

Dräger Medical Ag & Co Kgaa

Drager Medical Gmbh

Yvo Gärber

Hans Matthiessen

Jianhua Li

Steffen Leonhardt

Eckhard Teschner

Dieter Weismann

Markus Hampe

Dieter Sahmkow

Markus Steeger

Karsten Hoffmann

Hans-Wilhelm Steen

Rainer Degenhart

Rainer Goldau

Ola Stenqvist

Stefan Mersmann

Robert Pikkemaat

Tim Baier-Löwenstein

Jan Rüterbories

Arndt Pöcher

An electrical impedance tomography device () includes an electrode array, including a plurality of electrodes () arranged spaced apart from one another, a signal feed unit () and a signal acquisition unit (). A calculation and control unit () is configured to determine a current elliptical circumferential shape (') of the electrode array on a thorax () of a human being and to provide a control signal (), which indicates the elliptical circumferential shape () of the electrode array. The calculation and control unit () may be configured as a central unit or an array of distributed units (cloud computing) in order to determine and to provide the current elliptical circumferential shape (&#x2032;).

Device and method for determining a circumferential shape of an electrode array for electrical impedance tomography

An electrical impedance tomography device () includes an electrode array, including a plurality of electrodes () arranged spaced apart from one another, a signal feed unit () and a signal acquisition unit (). A calculation and control unit () is configured to determine a situation with an axial twist angle of the electrode array on a thorax () of a human being and to provide a control signal (), which indicates the situation with axial twist angle of the electrode array. The calculation and control unit () may be configured as a central unit or an array of distributed units (cloud computing) in order to determine and to provide the axial twist angle.

Device and method for determining an axial twist position of an electrode array for electrical impedance tomography

A great device () processes and visualizes electrical impedance tomography (EIT) data () of at least one region of the lungs for determining and visualizing regional properties of the lungs of a living being. The EIT data () are obtained from an electrical impedance tomography apparatus (). The device makes it possible to visualize regional properties of the lungs or of regions of the lungs in terms of hyperdistension or collapse.

Device for processing and visualizing data of an electrical impedance tomography apparatus for determining and visualizing regional properties of pulmonary ventilation

An electrical impedance tomography device includes a plurality of electrodes, a display apparatus, and a control and evaluation unit for reconstructing a matrix of image elements, a spatial distribution of impedance changes in an electrode plane, from measurement signals with a reconstruction algorithm. A time series of matrices are provided from an inhalation and an exhalation that follow. The control unit detects a local impedance change, as a function of a quantity monotonically dependent on average alveolar pressure, as inhalation and exhalation curves from the time series of matrices, to calculate a parameter representing the deviation between the inhalation and exhalation curves as a dissipation value of the image element and to associate the parameter with the image element, to combine the dissipation values of all examined image elements in a dissipation map, and to display the dissipation values with graphical codings dependent on dissipation values of the dissipation map.

Electrical impedance tomography device and electrical impedance tomography method

A device for determining the regional distribution of a parameter for lung perfusion includes an electrical impedance tomography unit with electrodes (E, . . . EN), which can be placed on the thorax, that are connected to a control and analysis unit () and an administering device () for the intravenous administration of a conductivity contrast medium. The control and analysis unit () is configured to display changes in impedance distribution occurring as a consequence of the administration of conductivity contrast medium as a parameter for lung perfusion in the section plane as a function of time. The administering device () has a controllable dispensing device. The control and analysis unit and the dispensing device are connected with one another via a data link (). A start time and an end time and a quantity of an administered bolus of the conductivity contrast medium are available to the control and analysis unit ().

Device for determining the regional distribution of a parameter for lung perfusion

A device () for processing data (), which were obtained from a medical device suitable for imaging the lungs or the thorax, particularly an electrical impedance tomography device (), provides improved visualization of a three-dimensional thoracic dimension () of the lungs. A characteristic contour () is determined continuously by continuous reference to a previously determined outer contour () of the lungs as a comparison variable and is outputted, provided and visualized as an output signal ().

Device for processing tomographic data for visualizing the course of a therapy

An electric impedance tomography device with chest electrodes, a display and a control and analyzing unit to determine a time series of a global ventilation curve from the sequence of reconstructed matrices as a time series of the mean impedance change or of a measured respiration volume, to divide an inspiration or expiration phase into a number of steps of equal volume change, to determine the times corresponding to these steps, to determine the change in local impedance between these times for each image element, the ratio of this local change in impedance to the global ventilation curve to form a local sequence of relative impedance changes of the image element as a function of the steps of equal volume change, to determine a scalar indicator characteristic as a function of the steps of equal volume change and to display each image element based on the respective scalar indicator.

Electric impedance tomography device and method

An EIT device has a plurality of electrodes () that can be arranged on a body in order to reconstruct the impedance distribution of the body with a reconstruction algorithm. The control unit () of the EIT device is set up by suitable programming to continuously determine at least one property (e, . . . , eM) each from the measured signals (U, . . . , UM) of all measuring channels and to correct measured signals of the measuring channels on the basis of the properties or to adapt the reconstruction algorithm on the basis of the properties.

Electrical impedance tomography device and process

An electroimpedance tomograph with a plurality of electrodes () is provided, which can be placed on the body of a patient and are connected via a selector switch () with a control and evaluating unit (). The control and evaluating unit () cooperates with the selector switch () such that two electrodes each are supplied with an alternating current from an AC power source () and the detected analog voltage signals of the other electrodes are processed in order to reconstruct therefrom the impedance distribution of the body in the plane of the electrodes, wherein a symmetrical AC power source is used to reduce common-mode signals. To further suppress interferences due to common-mode signals, provisions are made for the control and evaluating unit () to be set up, furthermore, for detuning the common-mode signal of the alternating current on the body against the ground by means of a common-mode signal measuring electrode () and, based on this, the symmetry of the symmetrical AC power source such that the common-mode signal on the body is minimized, and the corresponding detuning parameters are stored for each electrode pair.

Electroimpedance tomograph with common-mode signal suppression

An electroimpedance tomograph including a plurality of electrodes placed on a body, measuring circuits processing voltage signals recorded by the electrodes, and a control unit supplying two electrodes each with an alternating current. The control unit has a preset feed frequency. The control unit processes the processed voltage signals of all other electrodes to reconstruct the impedance distribution of the body in the electrode plane. The control unit provides for an automatic setting of the current feed frequency/frequencies to record a background frequency spectrum by detecting the electrode voltage signals over a preset period of time and record them as a voltage time series and transform them into a frequency spectrum. The control unit searches in the background frequency spectrum for a frequency (different states) or frequencies (different frequencies) that leads to a useful signal to background ratio above a preset threshold value when used as a feed frequency.

Electroimpedance tomograph

A device and a process for determining the change in the functional residual capacity (FRC) in a simple manner. Based on a first respiration phase for mechanical respiration, a recruitment maneuver is performed for this during a second respiration phase, and respiration is switched back to mechanical respiration during a third respiration phase. Reference values U, Uare formed from the end-expiratory values of the impedance measured signals U during the first respiration phase and the third respiration phase, and the difference &#x394;U (&#x394;FRC) between the reference value Uof the third respiration phase and the reference value Uof the first respiration phase is an indicator of the change in the functional residual capacity of the lung of the test subject.

Device and process for controlling a respirator

An electrode belt for impedance tomography shall be improved such that it has a simple design and makes possible good contacting of the electrodes () with the body of the test subject to be examined. The electrode belt () has at least 16 electrodes () on an electrode holder or belt material (), which is elastic at least in some sections. The belt formed of one or more belt material sections completely surrounds a test subject to be examined on the circumference of the body. Electrode feed lines () extend along the electrode holder (). The electrode feed lines and are connected to a feed line () at least at one feed point () on the electrode holder ().

Electrode belt

An electroimpedance tomograph is provided with a plurality of electrodes (), which can be placed on the body of a patient and are connected to a control and evaluating unit () via a selector switch (). The control and evaluating unit () cooperates with the selector switch () such that two electrodes each are supplied with alternating current from an AC power source (). The detected analog voltage signals of the other electrodes are sent into the control and evaluating unit () via a measuring amplifier () and AD converter () and are processed there in order to reconstruct the impedance distribution of the body in the plane of the electrodes therefrom. A symmetrical AC power source () is used to reduce common-mode signals. To make it possible to suppress errors due to common-mode signals, provisions are made for the control and evaluating unit () to be set up for making available an additional common-mode signal at an output during an adjusting mode of operation and to send it to the body via common-mode signal electrodes () that can be placed on the body. The control and evaluating unit () is prepared, furthermore, to adjust the measuring amplifier () according to value and phase for each electrode pair connected by the selector switch () such that the common-mode signal at the output of the measuring amplifier () is minimized, and the adjusted parameters are stored for each electrode pair.

A device is provided for putting an electrode carrier on a recumbent patient. The device includes a first lifting cushion that supports the shoulder region and the head of the patient at the same time and into which a pressurized medium can be admitted. A second lifting cushion is provided that supports the lumbar region and into which pressurized medium can be admitted. A spacer is provided fixing the lifting cushions in relation to one another in the chest region.

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Breitenfelde, Germany

Yvo Gärber