US 10,765,339 B2Granted

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

AssigneeDrägerwerk AG & Co. KGaA

InventorYvo Gärber

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Abstract

An electrical impedance tomography device (1) includes an electrode array, including a plurality of electrodes (33) arranged spaced apart from one another, a signal feed unit (51) and a signal acquisition unit (50). A calculation and control unit (70) is configured to determine a current elliptical circumferential shape (20′) of the electrode array on a thorax (34) of a human being and to provide a control signal (79), which indicates the elliptical circumferential shape (20) of the electrode array. The calculation and control unit (70) 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 (20′).

Claims8

Dependent claims

A method for the operation of an electrical impedance tomography device for a determination of an elliptical circumferential shape of an electrode array comprising a plurality of electrodes arranged on a thorax of a patient, the method comprising:

feeding an electrical feed signal to two feeding electrodes of the electrodes in each measuring run with the two feeding electrodes varying cyclically in a measuring cycle comprised of a plurality of measuring runs;
selecting measured signals at selected electrodes located opposite each of the feeding electrodes and acquiring the selected measured signals in each measuring run of a measuring cycle;
determining a mean value (Ū56) of each selected measured signal (U56X) of each electrode pair of the respectively selected electrodes in each measuring run;
determining a logarithmic ratio comprising
W
=
lg
⁡
(
U
56
⁢
X
U
_
56
)
,
⁢
W
=
ln
⁡
(
U
56
⁢
X
U
_
56
)
,
or
W
=
log
2
⁡
(
U
56
⁢
X
U
_
56
)
from each of the selected measured signals (U56X) and the mean values (Ū56) for the selected electrodes, as a current signal trace;
comparing the determined current signal trace with at least one pattern signal trace from a quantity of pattern signal traces, wherein the pattern signal traces represent different signal traces for different typical elliptical circumferential shapes of the electrode array on a thorax and a current elliptical circumferential shape is determined on the basis of the comparison;
and
generating a control signal which indicates the determined current elliptical circumferential shape of the electrode array on the thorax and providing the generated control signal as an output.

49 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/825,955Filed 29 Nov 2017
Priority: DE 10 2016 014 25230 Nov 2016
Published: US 2018/0146882 A131 May 2018
Granted: 8 Sep 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

A61B 5/0536
Measuring electrical impedance or conductance of a portion of the body: impedance imaging, e.g. by tomography
A61B 5/6823
Specially adapted to be attached to a specific body part: trunk, e.g., chest, back, abdomen, hip
A61B 5/6844
Specially adapted to be attached to or worn on the body surface: monitoring or controlling distance between sensor and tissue
A61B 5/7225
Signal processing specially adapted for physiological signals or for diagnostic purposes: details of analogue processing, e.g. isolation…

Family

US 2018/0146882 A1Pre-grant publication · published 31 May 2018
US 10,765,339 B2This patent

From the US filing history. Foreign family members aren’t listed.

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