Ivan Aleksandrovich Kudashov - Assistant, Department of Biomedical Techniques, Bauman Moscow State Technical University. E-mail: KydashovV@mail.ru
Sergey Igorevich Shchukin - Doctor, Professor, Head of a chair Department of Biomedical Techniques, Bauman Moscow State Technical University. E-mail: schookin@mx.bmstu.ru
Olga Viktorovna Belaya - Junior researcher, Federal State Budgetary Organization «RAMS Research Institute of Occupational Health». E-mail: ogabelaya@gmail.com
Sergey Yurievich Perov - Ph.D., leading researcher, Federal State Budgetary Organization «RAMS Research Institute of Occupational Health». E-mail: perov1980@mail.ru

The blood is one of the most informative types of tissue which used in medicine. The blood analysis is used for diagnostic and treatment. The first step is invasive study where a needle inserts through the skin and other tissues to the vein. But there are high possibility post injection complications linked to intravenous injection. The most popular complication is hematoma because of puncture of two parties vein. This problem depends on wrong intravenous introduction needle to the human body. There are technical methods of intravenous injections control that help to improve venipuncture technique and minimize complications by locating a needle in relation to the veins. The electrical impedance technic is the most promising method of needle position, which is based on analysis of electrical impedance signal. Electrical impedance is measured by positioning current electrode on surface of investigate tissue and passing an alternating current between the electrodes at 100 kHz and magnitude up to 5 mA. Needle electrode is connected with grounded current electrode. In this paper, the electrode system optimal location to determine the maximum method sensitivity to puncture and double puncture of vessel is studied by numerical simulations. The computations are performed applying quasi-static algorithm of the finite-difference time-domain (FDTD) software package. The moment of injection needle puncture is determined from the analysis of electrical impedance signals. The recorded signals depend on the location of the needle and the depth of penetration, as well as the location of the current electrodes. Different positions of needle and passive current electrodes to the active current electrode are considered to determine the maximum sensitivity of the needle electrode to puncture the vessel. Current electrodes are arranged on the surface of the flat phantom fat tissue with blood vessels. According to the results of the first stage of modeling the optimum position for the best sensitivity needle electrode on the active current electrode is determined, and the second - the position of the passive current electrode.

 

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