Device for building cardiac rhythmogram

FIELD: medical engineering.

SUBSTANCE: device has electrodes, input amplifier, unit for protecting against error influence when applying medical electric instruments, low frequency filter, signal analysis unit, unit for eliminating isoline drift and electric power supply units.

EFFECT: high accuracy in plotting rhythmograms; improved instruments manipulation safety.

1 dwg

 

The invention relates to medical equipment and can be used to monitor the nature of regulation of cardiac rhythm.

Known retrocardiac [1], which contains the amplifier, active filters, level control, the pulse shaper and the Registrar. The drawbacks are the limited accuracy and functionality.

A device for building ramagrama heart [2], containing the amplifier, active filters, level control, a pulse shaper, a microprocessor with associated elements, shapers signals and indicators. The drawbacks are the limited accuracy due to drift contour signal) and functionality (so as not provided by the mapping ramachandiran and electrocardiogram).

The closest in technical essence is a device for building ramagrama heart [3]containing the input amplifier, the device eliminate drift of the contour compensator in-phase signal, the main amplifier, LPF, ADC, the unit of analysis of signals with the communication device and the power supply. The drawbacks are the limited accuracy and protection from the effects of medical tools.

The technical result of the proposed solution is to increase the accuracy is stroenie ramagrama by applying a matched pair of Sigma-Delta ADC and microprocessor, and to enhance protection from the effects of medical tools without complicating the device as a whole.

The technical result is ensured by the fact that in a device for building ramagrama heart containing the electrodes, the input amplifier, the inputs of which are connected with the corresponding electrodes, block elimination drift contours, the input and output of which are connected respectively with the output and the input of the input amplifier, low pass filter and the block signal analysis, introduced block protection from interference when exposed to medical tools, made in the form of a key element, an input connected to another output of the input amplifier, and the output connected to the input of the low pass filter and the block signal analysis made in the form of a matched pair of Sigma-Delta analog-digital Converter and a microprocessor, the input of the Sigma-Delta analog-to-digital Converter connected to the output of the low pass filter, and the corresponding ports of the microprocessor are connected to the control inputs of the unit eliminate drift contours and a key element.

The drawing shows a structural diagram of a device for building ramagrama heart.

The device includes electrodes (not shown), the input amplifier 1, block 2 protection against interference when exposed honey is medicinal tools, filter 3 low frequencies, block 4 signal analysis, block 5 eliminate drift contours, as well as elements of power (not shown).

The device operates as follows. The ECG signal from electrodes placed on the body, is fed to the input amplifier 1, which will be compensated in-phase signal and the driven unit 4 analysis of the signal bandwidth, the noise frequencies, for example, in the range 0,5...5 Hz through block 5 eliminate drift contour that leads to a rapid (within 0.5 s) to restore contours. In the case of impact on the human body by medical tools, such as electrosurgery, the electrodes and the output of the input amplifier 1 create interference. Interference from a power tool, having usually a significant level and pulse duration are processed by increasing the leading edge in the LPF 3 and unit 4 analysis of the signal, which is formed by the control signal received through the corresponding port on the control input of block 2 of the protection from interference, made in the form of a key element, which may be implemented, for example, as an electronic key, providing functional electrical connection of the output of the amplifier 1 and the input low-pass filter 3 in the normal mode and functional electric is the weakening of this up to the full opening moments of the interference, that provides increased protection from the effects of medical tools. Unit 4 signal analysis performed on matched pairs of the Sigma-Delta analog-to-digital Converter and a microprocessor, which has high accuracy and sensitivity. This allows, in contrast to the prototype, to abandon the use of the main amplifier and to limit the use of a simple filter circuits 3 low frequencies (for example, a passive type), and use of standard software for the necessary calculations and to build and simultaneous display of ramagrama and ECG, are not inferior in quality in the prototype and analogues, but with simplified construction and maintenance of the device.

The device may be made of standard modules and on the available hardware components. Constructive execution of the blocks may overlap or include the construction of the same functional purpose of the prototype and its analogues. For example, the unit 1 may include a matching design units 1 and 13 of the prototype, blocks 3 and 5 matching units 4 and 2 prototype, the unit 2 can be made in the form of a key element, and the block 4 is in the form of a pair AD7716-MC68HC11" [4]. The execution units is generally determined by their functional purpose in the device and it is known or obvious from the prior art in applied temporarily and frequency ranges with standard software.

Sources of information

1. Retrocardiac RKS-01: Technical description. 1990.

2. Patent No. 2076628 (RU). Device for building ramagrama heart / AIS etc. // BI. 10.04.1979.

3. Patent No. 2199945 (RU). Device for building ramagrama heart / Vairano // BI. 10.03.2003.

4. 22-Bit Data Acquisition System. - One Technology Way, P.O.Box 9106, Norwood, MA 02062-9106, USA.

Device for building ramagrama heart containing the electrodes, the input amplifier, the inputs of which are connected with the corresponding electrodes, block elimination drift contours, the input and output of which are connected respectively with the output and the input of the input amplifier, low pass filter and the block analysis of the signal, characterized in that it introduced the unit of protection against interference when exposed to medical tools, made in the form of a key element, an input connected to another output of the input amplifier, and the output connected to the input of the low pass filter and the block signal analysis made in the form of a matched pair of Sigma-Delta analog-to -digital Converter and a microprocessor, the input of the Sigma-Delta analog-to-digital Converter connected to the output of the low pass filter, and the corresponding ports of the microprocessor are connected to the control inputs of the unit eliminate drift contours and a key element.



 

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5 ex

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