Electrode device for measuring the impedance of the head
The invention relates to medicine, more specifically to a diagnostic electrode devices for measuring electrical impedance of body tissues. The electrode device includes first and second dielectric substrate, in which the set current and potential contact elements. The base is connected bearing element and the hinge. Second base is made arcuate so that they can move along the arc of a circle whose center is the pivot. The hinge is installed in the middle of the outside edge of the first base offset from the edge. Bearing element is spring-loaded in the direction of the clamp to the first dielectric substrate. In the working part of the potential of the contact element is mounted porous elastic strip. The device allows to increase the accuracy of measurement of the impedance head. 1 C.p. f-crystals, 1 tab., 3 Il.The invention relates to medical equipment, namely to the diagnostic device, in which the study of the body is performed by sensing an alternating electric current to measure the electrical impedance of the tissues.The measurement of electrical impedance of the head by sensing parmeniani are the most benign (non-invasive), because they are held by means of signals of low power at a relatively low frequency 5-500 kHz. To measure with high precision electrical impedance (ZOhead is used tetrapolar method in which the excitation current (I3) is passed through the current electrodes and the voltage drop across the study area of the body is measured by the potential electrodes. For the study of intracranial tissues it is necessary to reduce the portion of the excitation current passing through the tissues of the face, and make the main part of it fell into the intracranial space.In the diagnostic plan electrodes for measuring the impedance of the head are used as transducers in instrumentation, reflecting the dynamics of the clinical condition of the patient: parameters of blood circulation and fluid balance.Known electrode device for measuring the impedance of tissue containing two pivotally United dielectric base connected to the flexible latch and the working parts are installed current and potential contact elements . This unit provides diagnostic tests, such as peoplesmart on the body parts that have C parts of the body, having a more complex configuration, it is not possible to obtain reliable results due to unstable contact of the elements with the body surface.The closest technical solution is a device for fixation of the electrodes containing two dielectric base, the working parts are installed current and potential contact elements, the bases are linked by the hinge and the supporting element and contain elastic retainer . This device allows for a diagnostic study by the excitation current in the parts of the body with a complex configuration, such as a person. However, registration of the potentials arising from the passage of the excitation current in the device is at a considerable distance from the current contact element. When heterogeneous anatomical structure of the examined part of the body, as the head in General, this leads to the fact that mostly recorded surface component of the excitation current. This drawback reduces the accuracy of measuring the total impedance of the head, the main part of which is the impedance of the intracranial space. It should be noted that the value of this impedance allows the intake technical result of the invention is to improve the accuracy of measurement of the impedance of the head due to the increase in the share of the excitation current, passing through the intracranial space, and the proportionality between the Desk and outer intracranial components of the excitation current.The technical result is achieved in that in an electrode device for measuring the impedance of the head, containing the first dielectric base in the working part of which has current contact element, the second dielectric base, the working part is set to the potential of the contact element and which is connected with the first dielectric base by a hinge and a bearing element, current and potential contact elements oriented in one direction and the opposite side of the first dielectric base is connected with an elastic clamp, ensuring the clamping of the working part to the sample surface, the hinge is installed on the outside part of the first dielectric base offset from the edge, to which is oriented supporting member, the second dielectric base is made arcuate so that they can move along the arc of a circle whose center is the axis of the hinge, which is oriented concave part of the second dielectric substrate, the end of which is working chei this electrode device for measuring the impedance of the head may contain a porous elastic strip, enshrined in the working part of the potential of the contact element.The invention is illustrated by drawings, where:- Fig.1 shows a General view of the electrode device;- Fig.2 shows an equivalent diagram showing the distribution of the excitation current in its passage from the frontal sinus to the neck;- Fig.3 shows the equivalent circuit of the noise compensation arising from different angles of the nose.The electrode device comprises a first dielectric base 1, in the working part of which has current contact element 2, the second dielectric base 3, the end part is set to the potential of the contact element 4. The base 1 is connected to the base 3 by means of the hinge 5 and the bearing member 6. The base 3 is made arcuate so that they can move along the arc of a circle whose center is the axis of the hinge 5. Concave part of the base 3 facing toward the hinge 5. At opposite ends of the base 1, oriented relative to the element 6 made 7 hours with slots 8, 9 for fixing the elastic cord 10 and the spring element 11. In the working part of the element 4 can additionally be fixed porous strip 12.Devices the 6 allocated and retained a free hand, to element 4 and the strip 12 were above the outside surface of the base 1. The element 2 is placed on the skin projection of the frontal sinuses so that when the release element 6 under the action of the element 11 has pressed the gasket 12 to the surface of the nose. Then the heavy 10 is slid around the head and changing its length by moving in the slots 8, the desired degree of clamping the device to the sample surface of the head. If necessary, the clamping strip 12 to the surface of the nose can be adjusted by changing the length of the element 11 through the slots 9.The measurement of intracranial space is complicated by the fact that the cranial bone has a higher impedance than the superficial tissue of the head from which the excitation current to a greater extent tends to be distributed in the subcutaneous tissues of the face. The fixation element 2 in the projection of the frontal sinus can increase intracranial portion of the probe current due to the fact that in this area of the cranial bones have the least thickness, and the cavity of the frontal sinuses are covered with mucous membrane, which is a good conductor of current.When measuring the impedance of the head of the probe current (I3) from the source of current is passed between the element 2 and e is a V e to the neck (ZW) in two directions (Fig.2):- in the first direction, the portion of current I3passes through the tissue in the frontal projection (ZPLsinus and intracranial space (ZRF);- in the second direction of the portion of the current I3passes through the tissue in the nose (ZP), and then branches into two branches: the first includes ocular tissue (ZG)and intracranial space (ZRF), and the second only facial tissue (ZL).Thus, when the location of the item 2 in the projection of the frontal sinus, part of the current I3, flowing through the tissues of the eye (ZG), increasing the proportion of the current passing through the intracranial space (ZRF), and thus the potential values are registered in the item 4, more display parameters of intracranial tissues. To increase the degree of display parameters intracranial tissues in the potential detected by the element 4, it is desirable that he was a short distance from the element 2, but would be excluded leakage between elements 2 and 4 on the surface of the skin.Execution grounds 3 arched and moving on the arc of a circle whose center is the pivot 5, allows to compensate the existing anatomically is the super plane of the forehead. When the clamping element 4 to the upper part of the nose is moved along the arc of a circle whose center is the axis of the hinge 5 (Fig.3). This partially compensates the misalignment angle of the nose (the line: "a", "b", "b" Fig.3) and the contact plane of the element 4 and increases the stability of its contact with the surface of the skin. The moving element 4 along the arc also makes it more stable gap between the edges of the elements 2 and 4, i.e., allows you to place elements 2 and 4 with a small gap between them and thereby to a greater degree show in the recorded potential parameters intracranial tissues.The device in the claimed running has a precision measurement of the impedance of the head, allowing the monitoring of patients with characteristic clinical dynamics to produce quantitative displaying diagnostic parameters. For example, impedance measurement of the head at a low frequency (ZN) and a capacitive component (ZE) with high frequency in patients after trauma made it possible to calculate the dynamics of the volume of extracellular, cell and total fluid head . The obtained results allow to observe mutually opposite dynamics of extracellular volume and CL is its value in the next time (table).Sources of information1. Inventor's certificate SU # 1158163 And, CL And 61 In 5/05, 188.8.131.52. Inventor's certificate SU # 1324641 A1, CL And 61 In 5/0295, 02.01.86.3. Captains E. N. Biophysical model to determine the volume of fluid in the body when it is sensing an alternating electric current. M., proceedings of the fifth scientific conference: "Diagnosis and treatment of disorders of regulation of the cardiovascular system", March 2003, S. 196-203.
Claims1. Electrode device for measuring the impedance of the head, containing the first dielectric base in the working part of which has current contact element, the second dielectric base, the working part is set to the potential of the contact element and which is connected with the first dielectric base by a hinge and a bearing element, current and potential contact elements oriented in one direction and the opposite side of the first dielectric base is connected with an elastic clamp, ensuring the clamping of the working part to the sample surface, characterized in that the hinge is installed in the middle of the outside part of Elektricheskie the base is made arcuate so that they can move along the arc of a circle, centre of which is the axis of the hinge, which is oriented concave part of the second dielectric substrate, the end of which is the working part, and the bearing element is spring-loaded in the direction of the clamp to the first dielectric substrate.2. The device under item 1, characterized in that it contains a porous elastic strip fixed in the working part of the potential of the contact element.
SUBSTANCE: method involves carrying out urological examination for determining hydrodynamic resistance of ureter calculated from formula Z=8Lμ/(πR4), where Z is the hydrodynamic resistance of ureter, L is the ureter length, R is the ureter radius, μ is the urine viscosity. Angle α at which the ureter enters the urinary bladder is determined from formula cosα = 8l1μ/(ZπR4), where l1 is the perpendicular drawn from the upper edge of the ureter to the its exit projection line, μ is the urine viscosity, Z is the hydrodynamic resistance of ureter, R is the ureter radius. Vesicoureteral reflux recidivation is predicted when the angle of α+90° is less than 120°.
EFFECT: enhanced effectiveness in reducing the number of recidivation cases.
2 dwg, 1 tbl
SUBSTANCE: one should measure electric impedance of patient's middle ear. Electrodes should be applied in three localizations: auditory canal, anterior end of lower nasal concha and frontal skin. Electric impedance should be measured at the frequencies of sinusoidal signal being equal to 10, 30, 250 and 1000 Hz, the data obtained should be compared by values of electric impedance in the given area (middle ear) in the group of healthy patients. This method provides the chance to obtain comparative data for diagnostics of middle ear diseases.
EFFECT: higher accuracy of evaluation.
FIELD: medicine; medical engineering.
SUBSTANCE: method involves doing multi-channel recording of electroencephalogram and carrying out functional tests. Recording and storing rheoencephalograms is carried out additionally with multi-channel recording of electroencephalogram synchronously and in real time mode in carotid and vertebral arteries. Electroencephalograms and rheoencephalograms are visualized in single window with single time axis. Functional brain state is evaluated from synchronous changes of electroencephalograms, rheoencephalograms and electrocardiograms in response to functional test. The device has electrode unit 1 for recording bioelectric brain activity signals, electrode unit 2 for recording electric cardiac activity signals, current and potential electrode unit 3 for recording rheosignals, leads commutator 4, current rheosignal oscillator 5, synchronous rheosignal detector 6, multi-channel bioelectric brain activity signals amplifier 7, electrophysiological signal amplifier 8, demultiplexer 9, multi-channel rheosignal amplifier 10, multi-channel analog-to-digital converter 11, micro-computer 12 having galvanically isolated input/output port and personal computer 13 of standard configuration.
EFFECT: enhanced effectiveness of differential diagnosis-making.
11 cl, 6 dwg
FIELD: medical engineering.
SUBSTANCE: device has acting upon skin between electrodes with DC potential of given magnitude for producing temporary breakdown. Skin impedance is measured between measuring electrode first negatively polarized relative to control electrode and the control electrode, and then, DC current resistance is measured once more by means of measuring electrode positively polarized relative to the control electrode. Ratio of the obtained values is used for determining internal organ health state, corresponding to skin area.
EFFECT: enhanced accuracy of diagnosis.
11 cl, 14 dwg, 2 tbl
FIELD: poultry science.
SUBSTANCE: the present innovation deals with visual evaluation in chicken followed by testing them by the value of bioelectric potential. Chickens with bioelectric potential being significantly higher against average values are considered to be stress-resistant ones and those with bioelectric potential being significantly lower against average values in concrete population are concluded to be stress-sensitive ones. The method is very simple in its implementation and efficient for large-scale selection in poultry on stress-resistance.
EFFECT: higher efficiency.
1 cl, 2 dwg, 2 ex, 4 tbl
SUBSTANCE: the method deals with measuring geometric body size and electric impedances of patient's hands, body and legs at their probing with low- and high-frequency current due to current and potential electrodes applied onto distal parts of limbs, and, thus, detecting extracellular, cellular and total volumes of liquid in patient's hands, body and legs. While implementing the method one should additionally apply current electrodes onto left-hand and right-hand parts of neck, and potential electrodes - onto distal femoral parts. Body impedance (Zb) should be measured due to successive measuring the impedance of its right-hand Zrb and left-hand Zlb parts at probing current coming between electrodes of similar sides of patient's neck and legs to detect Zb, as Zb = Ѕ x (Zrb + Zlb), impedance of legs Zl should be detected due to measuring femoral impedance Zf and that of shins Zs, as Zl = Zf + Zs. At detecting the volumes of liquid in body and legs one should apply measured values of Zb and Zl, moreover, as geometric body size one should apply the distance against the plane coming through the upper brachial surface up to the middle of radiocarpal articulation in case of patient's hand being along the body.
EFFECT: higher accuracy of detection.
5 dwg, 2 ex, 3 tbl
FIELD: medicine; medical engineering.
SUBSTANCE: method involves applying electrodes to injured extremity tissue under study. The electrodes are arranged in diametrically opposite points of horizontal plane transaction to extremity surface. Two electrodes are applied to the other extremity. The electrodes are arranged in diametrically opposite points of horizontal plane transaction to extremity surface. An initial point is selected relative to which pairs of electrodes are equidistantly arranged on the extremity. Active and reactive impedance components are measured at the places of electrodes positioning. Viability condition of the injured extremity tissue under study is diagnosed depending on ratio of reactive to active impedance component on injured and intact extremity and difference between reactive impedance component on injured and intact extremity. Device has transducer unit, computer and unit for processing signals having interface units, central subscriber station, autonomous transmission center, commutator which input is connected to transducer unit output and commutator output is connected to central subscriber station input, the first input is connected to autonomous transmission center output.
EFFECT: high accuracy in diagnosing biological object condition.
5 cl, 5 dwg, 4 tbl
FIELD: medicine, psychotherapy.
SUBSTANCE: the method deals with correcting neurological and psychopathological disorders with anxiety-phobic symptomatics due to individual trainings. The method includes evaluation of body reaction to stimulating signals, seances of individual training performed due to the impact of two quasiantipodal stimulating signals of similar physical modality applied in time of sporadic character, and as a signal one should present biological feedback for the altered value of physiological parameter adequately reflecting body reaction to the impact of stimulating signal. At the first stage of training it is necessary to achieve body adaptation to the impact of quasiantipodal stimulating signals, at the second stage it is necessary to obtain conditional reflex for one out of stimulating signals, for this purpose one should accompany this stimulating signal with discomfort impact, during the third stage, finally, due to volitional efforts one should suppress body reaction to stimulating signal. The devise suggested contains successively connected a transformer of physiological parameter into electric signal and a bioamplifier, an analysis and control block with a connected block to present the signals of biological feedback, a block for presenting discomfort impact, an indication block and that of forming and presenting quasiantipodal stimulating signals. The innovation enables to have skills to control one's emotions, decrease sensitivity threshold to environmental impacts and learn to how behave during stress situations.
EFFECT: higher efficiency of training.
15 cl, 8 dwg
FIELD: medicine; medical engineering.
SUBSTANCE: method involves recording multichannel electroencephalogram, electrocardiogram record and carrying out functional test and computer analysis of electrophysiological signals synchronously with multichannel record of electroencephalogram and electrocardiogram in real time mode. Superslow brain activity is recorded, carotid and spinal artery pools rheoelectroencephalogram is recorded and photopletysmogram of fingers and/or toes is built and subelectrode resistance of electrodes for recording bioelectrical cerebral activity is measured. Physiological values of bioelectrical cerebral activity are calculated and visualized in integrated cardiac cycle time scale as absolute and relative values of alpha-activity, pathological slow wave activity in delta and theta wave bandwidth. Cerebral metabolism activity dynamics level values are calculated and visualized at constant potential level. Heart beat rate is determined from electrocardiogram, pulsating blood-filling of cerebral blood vessels are determined from rheological indices data. Peripheral blood vessel resistance level, peripheral blood vessel tonus are determined as peripheral photoplethysmogram pulsation amplitude, large blood vessel tonus is determined from pulse wave propagation time data beginning from Q-tooth signal of electrocardiogram to the beginning of systolic wave of peripheral photoplethysmogram. Postcapillary venular blood vessels tonus is determined from constant photoplethysmogram component. Functional brain state is determined from dynamic changes of physiological values before during and after the functional test. Device for evaluating functional brain state has in series connected multichannel analog-to-digital converter, microcomputer having galvanically isolated input/output ports and PC of standard configuration and electrode unit for reading bioelectric cerebral activity signals connected to multichannel bioelectric cerebral activity signals amplifier. Current and potential electrode unit for recording rheosignals, multichannel rheosignals amplifier, current rheosignals generator and synchronous rheosignals detector are available. The device additionally has two-frequency high precision current generator, master input of which is connected to microcomputer. The first output group is connected to working electrodes and the second one is connected to reference electrodes of electrode unit for reading bioelectrical cerebral activity signals. Lead switch is available with its first input group being connected to potential electrodes of current and potential electrodes unit for recording rheosignals. The second group of inputs is connected to outputs of current rheosignals oscillator. The first group of outputs is connected to current electrodes of current and potential electrodes unit for recording rheosignals. The second group of outputs is connected to inputs of synchronous detector of rheosignals. Demultiplexer input is connected to output of synchronous detector of rheosignals and its outputs are connected to multichannel rheosignals amplifier inputs. Outputs of multichannel bioelectrical cerebral activity signals amplifier, multichannel rheosignals amplifier and electrophysiological signal amplifier are connected to corresponding inputs of multichannel analog-to-digital converter. Microcomputer outputs are connected to control input of lead switch, control input of multichannel demultiplexer, control input of multichannel analog-to-digital converter and synchronization inputs of current rheosignals oscillator and synchronous detector of rheosignals. To measure subelectrode resistance, a signal from narrow bandwidth current generator of frequency f1 exceeding the upper frequency fup of signals under recording is supplied. A signal from narrow bandwidth current generator of frequency f2≠ f1>fup is supplied to reference electrode. Voltages are selected and measured at output of each amplifier with frequencies of f1, f2 - Uf1 and Uf2 using narrow bandwidth filtering. Subelectrode resistance of each working electrode is determined from formula Zj=Ujf1 :(Jf1xKj), where Zj is the subelectrode resistance of j-th electrode, Ujf1 is the voltage at output from j-th amplifier with frequency of f1, Kj is the amplification coefficient of the j-th amplifier. Subelectrode resistance of reference electrode is determined from formula ZA=Ujf2 :(Jf2xKj), where ZA is the subelectrode resistance of reference electrode, Ujf2 is the voltage at output from j-th amplifier with frequency of f2, Jf2 is the voltage of narrow bandwidth current oscillator with frequency of f2.
EFFECT: wide range of functional applications.
15 cl, 10 dwg
FIELD: medical engineering.
SUBSTANCE: device has divider, comparison unit, oscillator, acoustic radiator, controllable current source, stable constant voltage source, perspiration equivalent unit, key member, illumination source, conductivity transducer having two electrodes, the first commutator, delay unit, trigger, inverter, discharge unit, the second commutator and feeding voltage availability indicator unit. The first delay unit inputs and the first commutator inputs are connected to comparison unit output. The first commutator input is connected to the first oscillator input which delay unit, trigger and inverter are connected in series. Inverter output is connected to the second input of the first and the second commutator. The first input of the second commutator is connected to the other conductivity transducer electrode and its output is connected to device body via resistor.
EFFECT: reduced current intensity passing through patient skin; excluded negative influence upon skin during prolonged operation time on patient arm during hypoglycemia attack; low power consumption.
2 cl, 4 dwg