Brain edema change measuring method based on minimum impedance frequency

An impedance frequency and measurement method technology, applied in the field of medical measurement, can solve the problem of not providing 24-hour bedside monitoring, and achieve the effect of avoiding mutual influence, improving quality factor, and accurate measurement results.

Active Publication Date: 2012-10-17
CHONG QING BORN FUKE MEDICAL EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, transcranial sonography (TCS), based on medical ultrasound technology, has developed techniques for the non-invasive assessment of hydrocephalus, but none of the above methods provide 24-hour bedside monitoring

Method used

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  • Brain edema change measuring method based on minimum impedance frequency
  • Brain edema change measuring method based on minimum impedance frequency
  • Brain edema change measuring method based on minimum impedance frequency

Examples

Experimental program
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Embodiment 1

[0030] figure 1 Provided for the embodiment of the present invention at a distance d from the load impedance Z L Input impedance measurement, image 3 The flow chart for measuring the edema caused by brain tissue provided by the embodiment of the present invention is shown in the figure: a method for measuring changes in brain edema based on the minimum impedance frequency provided by the present invention includes the following steps:

[0031] S1: Set the measuring electrodes on the brain to be tested through the transmission line; the measuring electrodes in this embodiment are the electrode sheet 3 and the electrode

[0032] Electrode 4, attach electrode 3 and electrode 4 to the brain to be tested;

[0033] S2: Obtain the characteristic impedance Z of the transmission line 0 and the length l of the transmission line;

[0034] S3: Send electromagnetic waves to the brain through the transmitting electrodes, and the electromagnetic waves pass through the brain; the two end...

Embodiment 2

[0051] figure 2 The schematic diagram of the equivalent impedance of biological tissue provided by the embodiment of the present invention is shown in the figure: the load impedance provided by the present invention is equivalent to a resistor connected continuously to the capacitor, when the input impedance is measured from the load impedance at a certain distance , Z_measured (brain body matching impedance) which is completely different from Z_laod (instrument self-adjusting fixed impedance) can be obtained.

[0052] As an example, if the transmission line impedance is 50Ω and the load impedance is (15–j60)Ω, the impedance measurement at 50MHz is almost purely resistive, approximately (6.0+j0.000)Ω at a distance of 0.854 meters from the load impedance. When the frequency is less than 50MHz, it is capacitive. When the frequency is higher than 50MHz, the measured impedance becomes inductive. When the load impedance is (15–j64.827), the measured impedance becomes almost pure...

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Abstract

The invention discloses a brain edema change measuring method based on a minimum impedance frequency. The brain edema change measuring method comprises the following steps: firstly, arranging a measuring electrode on a brain to be detected through a transmission line to obtain a specific impedance of the transmission line and the length of the transmission line; then sending electromagnetic waves to the brain through an emission electrode to penetrate through the brain and inputting the electromagnetic waves into a signal processor to obtain a measuring impedance at a distance 1; finally judging whether an amplitude of the measuring impedance reaches to a partial minimum value or not; and if so, calculating a load impedance. According to the brain edema change measuring method based on the minimum impedance frequency, the load impedance is calculated by measuring the impedance to obtain a method for measuring the change of dielectric constants of brain tissues, and an impedance transmission line which is better matched with the impedance transmission line is accurately used in the method, so that a large quantity of inductances are not introduced, and the impedance amplitude reaches to the partial minimum value at a certain frequency and the induction resistance of the load impedance is canceled, and therefore the minimum impedance frequency (MIF) is obtained and the measured load impedance can be obtained through obtaining a frequency, an optical cable length and the impedance.

Description

technical field [0001] The invention relates to the field of medical measurement, in particular to a method for measuring changes in brain edema. Background technique [0002] In clinical medicine, cerebral edema (cerebral infarction and cerebral hemorrhage) is a common fatal lesion that has entered the top three domestic morbidity and mortality in recent years. Whether the rescue is timely is the key to saving lives and reducing sequelae. Clinical cerebral edema is mainly detected by CT, conventional magnetic resonance (MRI) and MRI diffusion weighted imaging (DWI). Although the scope and degree of instantaneous cerebral edema can be accurately judged, there is a lack of real-time information on the evolution of edema during the clinical process. Due to the radioactivity of CT, CT cannot be used for a long time and is not suitable for clinical monitoring. [0003] Studies in recent years have shown that within 48 hours from the beginning of cerebral hemorrhage, about 30%-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/053
Inventor 郑翊蒋辉吴琪唐英勇
Owner CHONG QING BORN FUKE MEDICAL EQUIP CO LTD
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