Stenosis detection device
First Claim
1. A device for determining a peak blood flow signal of a blood flow through at least a section of a selected coronary artery of a beating heart of a mammal, in particular a human being, wherein said device comprises a bioimpedance measuring device, which at least comprises at least two measuring electrodes, an impedance measuring device for measuring an impedance signal Z between a pair of said measuring electrodes, and processing means, which are able to determine a first time-derivative dZ/dt for said measured impedance signal Z, and to separate from said first time-derivative dZ/dt a peak signal PS that occurs first after the beginning of diastole of said heart during a heart beat, and wherein said processing means are able to determine a maximum value MAX of said peak signal PS.
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Abstract
The present invention provides a method and a device for determining a peak blood flow signal of a blood flow through at least a section of a selected coronary artery of a beating heart of a mammal, in particular a human being, wherein said device comprises a bioimpedance measuring device. The method and device selects part of a bioimpedance signal, and calculates a peak velocity from it. This may e.g. be used to map the peak blood flow velocity along a coronary artery, in order to find possible stenoses in the vessel.
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Citations
19 Claims
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1. A device for determining a peak blood flow signal of a blood flow through at least a section of a selected coronary artery of a beating heart of a mammal, in particular a human being, wherein said device comprises a bioimpedance measuring device, which at least comprises
at least two measuring electrodes, an impedance measuring device for measuring an impedance signal Z between a pair of said measuring electrodes, and processing means, which are able to determine a first time-derivative dZ/dt for said measured impedance signal Z, and to separate from said first time-derivative dZ/dt a peak signal PS that occurs first after the beginning of diastole of said heart during a heart beat, and wherein said processing means are able to determine a maximum value MAX of said peak signal PS.
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10. A method for determining a peak blood flow signal PF of a blood flow through at least a section of at least one selected coronary artery of a beating heart of a mammal, in particular a human being, comprising the steps of
applying a bioimpedance measuring device at least comprising impedance measuring means and at least two mutually spaced measuring electrodes to the body of said mammal, wherein at least said section of said at least one selected coronary artery is bounded by a pair of measuring electrodes of said at least two measuring electrodes, measuring an impedance signal Z between said pair of measuring electrodes, by means of said bioimpedance measuring device, which signal Z depends on the blood flow through that section of said at least one selected coronary artery which is bounded by said pair of measuring electrodes, determining a first time-derivative dZ/dt of said impedance signal separating from said first time-derivative dZ/dt a peak signal PS that occurs first after the beginning of diastole of said heart during a heart beat, determining for said peak signal PS a maximum value MAX of said peak signal PS.
Specification