Digital reconstructing heart output instrument

A technology of cardiac output and digital reconstruction, applied in blood flow measurement, diagnostic recording/measurement, medical science, etc.

Inactive Publication Date: 2007-11-07
况明星
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Problems solved by technology

[0009] In order to solve the existing problems in the theory and practice of the existing impedance cardiography technology, this instrument uses a six-lead method consisting of 15 electrodes to detect six The mixed impedance changes of the body surface and the corresponding basic impedance of a symmetrical part are substituted into the chest impedance simultaneous equations. Aft

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] As shown in Figure 7: 1 is a crystal oscillator, 2 is a frequency divider, 3 is a high-frequency constant current source (made up of a power amplifier and a current limiting resistor), 4 is an electrocardiographic constant current lead wire, and 5 is a current electrode (made up of A semi-ring electrode and two square electrodes), the constant current output by the constant current source 3 is sent into the human body through 4 and 5. The other output of the frequency divider 2 is applied to the pulse generator 6 for generating acquisition timing pulses. 7 is an electrocardiographic electrode (made up of four square electrodes), 8 is a lead conversion circuit, and 9 is an electrocardiographic amplifier (made up of an integrated operational amplifier), and human body electrocardiographic signal is sent to electrocardiographic amplifier 9 to amplify through 7 an...

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Abstract

The impedance waveform reconstructing cardiac output instrument consists of a high frequency constant current source with crystal oscillator, a six-channel impedance detecting circuit, a Z0 temperature correcting circuit, a cardioelectric amplifier, a heart sound amplifier, a timing pulse generator, a A/D converting card, an isolating power source, a computer and corresponding measuring software. It can reconstruct impedance waveform, separate out different impedance components from the mixed impedance signal, draw corresponding waveform figures, measure, calculate, display and print ten cardiac function parameters automatically. The present invention is superior to available automatic cardiac function instrument.

Description

Technical field: [0001] The invention is a medical detection instrument for measuring ten left ventricle function indexes such as cardiac output by using a reconstructed cardiac impedance map, which belongs to the technical field of human body electrical bioimpedance information detection, and is precisely a digital reconstructed cardiac output instrument. Background technique: [0002] Cardiac output refers to the amount of blood discharged by the human heart per minute, and its measurement methods are divided into two categories, invasive and non-invasive. Invasive methods include Fick method, dye dilution method, thermodilution method, etc. These methods need to insert a cardiac catheter into the heart, which has certain damage and risks to the human body, and are basically not used in clinical practice at present. Non-invasive methods include ultrasound, sphygmograph, impedance method, etc. Among them, ultrasound and sphygmograph are basically not used in clinical practi...

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Application Information

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IPC IPC(8): A61B5/029A61B5/053
Inventor 况明星
Owner 况明星
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