SU770502A1 - Device for measuring cardiosignalling device noise stability - Google Patents

Description

The invention relates to medical technology and can be used in the measurement and quantification of the noise immunity of cardiosynchronizers, which are used as parts of many cardiological devices, such as bedside monitors, defibrillators, cardiac pacemakers, radio telemetry systems, heart rate meters, etc. ’Θ

Known devices for measuring the noise resistance of cardiac signaling devices, containing a signal source, a cardiac signaling device, and subsequently. The logic block 15 and the block for automatic calculation of measurement results [1].

The known device has large errors in measuring noise immunity. 20

The aim of the invention. Is to improve the accuracy of measuring the noise immunity of cardiac signaling devices.

To do this, a block of threshold adjustment and the first 25 pulse generator connected with a cardiac alarm device, a delay element and a serially connected reference cardiac alarm device, a multivibrator connected with an element are introduced into the device.

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delay, and the second pulse generator, while the latter is connected to the reference input of the logic unit, the signal input of which is connected to the first generator, and the signal source is connected to the inputs of both cardiac signaling devices.

The drawing shows a block diagram of the device.

The device includes a magnetic source 1 signal, a reference cardiac signaling device 2, a multivibrator '3 with an adjustable element 4 delay, a second generator of 5 pulses, a cardiac alarm device 6, a threshold adjustment unit 7, the first generator- * .8 pulses, a logic unit 9, an input element And 10, the element is NOT 11 and 12 and the output elements are And 13 and 14 and the block 15 is an automatic calculation of measurement results.

The test signal from the magnetic source 1 enters the two channels - the channel of the tested cardiac signaling device 6 and the channel of the reference cardiac signaling device 2. The reference cardiac signaling device 2 can be made either as an independent device or as a. ^Mr. 0snove digital computer. Interference measurement3

stability is carried out at several fixed threshold levels of the tested heart rate monitor 6 using block 7. Adjustable delay element 4 makes it possible to adjust the delay of pulses. In both channels, the generators 5 and 8 pulses produce standard pulses, which are fed to the input of logic unit 9, and, precisely, to the input element I 10, which separates the false alarm errors and the gaps made by the impartable cardiac signaling device b, and feeds them through the logic elements 11- 14 to the inputs of the unit 15 for automatic calculation of measurement results. The structure of block 15. includes a total counter. reference sum (signal from generator 5 output), skip counter (signal from element 13 output), false alarm counter (signal from element 14 output), total experimental sum counter (signal from generator 8). The measurement results are compared at the optimal threshold for each cardiac detector, i.e. with the least errors of false alarm and omissions.

The proposed device allows you to determine the experimental detection error, the error from false positives and the error from the omissions. Eui indicators are central to the selection of cardiac alarms for noise immunity.

7705С2 4

Claims (2)

Claim 1. A device for measuring the noise immunity of cardiac signaling devices, containing a signal source, a cardiac signaling device and successively connected logical unit and an automatic calculation unit for measuring results, characterized in that, in order to improve the accuracy of noise immunity measurement, an adjustment unit is entered into the device the threshold and the first pulse generator associated with the cardiac sig ng, the delay element and the serially connected reference cardiosigial15 mash, the multivibrator associated with the delay element, and the second pulse generator, the latter being connected to the reference input of the logic unit, the signal input of which is connected to the first generator, and the signal source is connected to the inputs of both cardiac signaling devices. 2. The device according to claim 1, characterized in that the logical block contains the input element And, ** associated with two parallel chains, each of which consists of. from the element NOT and the output element I.