Abstract:
A method for executing the measurement of the migration of mercury ions from test pieces (1), such as tooth fillings or amalgam samples, which consist of dental amalgam and mercury. Effective measurement is made possible. The test piece (1) is subjected to a negative charging voltage which exceeds the inherent negative ionization voltage of the test piece, by causing the aforementioned negative charging voltage to be applied externally or by utilizing a measuring cell (3) for the application of the aforementioned negative charging voltage, causing mercury ions to migrate from the test piece (1) in question. The invention also relates to an arrangement for the implementation of the method.
Abstract:
An apparatus and method for non-invasive sensing of bone healing. The apparatus and method uses a coil (10), which spatially concentrates a magnetic field around a body portion, and an oscillator detector (12) which detects impedance changes at the fracture site during the healing process. The impedance change at the fracture site is a direct indication of the mechanical strength of the fracture site.
Abstract:
A process and an equipment are used for examination of electro-chemical effects inducing inflammation and allergic symptoms in the living organism, which are induced by two or more metal replacements respectively by other, in the living organism implanted metal (implantation). During the procedure according to the invention at patients with inflammatory and/or allergic symptoms it is controlled by in vivo current-measuring near the approachable metal replacements (implantations), if the ion current - which is established on the effect of galvanic cell has been created by metal replacements - reaches the allergic symptoms or the critical value inducing inflammation, further on the values of electrode potentials measured on the implantations are compared to the anode-polarization curves given to the metal replacement alloys, and on the basis of it the conclusion is drawn on the measure of ion current developed between certain metal replacement pairs. The equipment according to the invention consists of an electronic unit (1) and probe (2, 3, 5) used for measuring current resp. electrode potential. In the electronic unit there is a current-voltage converter (11) sensing current to be measured, an instrumental amplifier (12) sensing voltage to be measured, a precision rectifier (13) connected by its input with the output of formers, and on the output of it a suitably logarithmic amplifier (14) is connected, and on the amplifier a voltage-current converter is connected, which drives a suitably analogous indicator, especially Deprez-instrument (16). For the sake of the simplier handling, the equipment can be supplied with sound and/or light-source, which give signal for the doctor in case of overflowing a given value (voltage or current) about the presence of pathological ion-migration.
Abstract:
Apparatus for measuring cardiac and/or pulmonary activity, comprising an electrical oscillator (3), a pair of electrodes (1, 2) for applying the oscillating electrical signal to the thorax of a patient, an oesophageal probe (8) including an oesophageal electrode (8a, b), a sensing electrode (5) adapted to be positioned on the chest of the patient in the region of the apex of the heart, whereby measurement of voltage between the said first and second electrodes provides a measure of cardiac volumes, a third electrode (6) adapted to be positioned on the chest of the patient at a position on the right side of the chest generally corresponding with that of the second electrode (5) of the left side of the chest, whereby measurement of voltage between the said first and thrid electrodes provides a measure of volume of the right lung of the patient, means (11-13) for measuring the voltage induced between the first and second, and the first and third electrodes respectively, and for thereby providing first and second output signals respectively, indicative of cardiac and pulmonary activity respectively.
Abstract:
The present invention relates to a method for determining the energy-information characteristics of a biological object, wherein said method comprises fixing and correlating a gas-discharge illumination system in an electro-magnetic field for a reference object and for the object to be analysed. The gas-discharge illumination systems thus fixed for the reference object and the object to be analysed are then converted into a digital code. This method also comprises determining the quantitative parameters of the illumination systems which indicate their two-dimensional geometrical characteristics. This method further comprises determining for both the reference object and the object to be analysed the corresponding points of said parameters in a multi-dimensional space and, from the distance between said points, the deviation of the energy-information characteristics of the object to be analysed relative to those of the reference object. It is further possible to determine the quantitative parameters of the gas-discharge illumination systems which indicate their luminosity, spectral and fractal characteristics.
Abstract:
This invention is an invasive probe apparatus including a flexible, elongate probe (20), having a distal end (22) for insertion into the body of a subject. The probe includes first and second position sensors (28, 30), fixed in a known relation to the distal end, which generates signals responsive to position coordinates thereof, and at least one contact sensor (70) along a radial surface thereof, which generates signals responsive to the contact of the radial surface with a surface inside the body. The apparatus further includes signal processing circuitry (36), which receives the position/responsive and contact/responsive signals, and processes them to determine the locations of a plurality of points along the length of a portion of the probe in a vicinity of the first and second position sensors.
Abstract:
A system for measuring facial impedance of patients with hemiparesis, or unilateral facial palsy, provides a program for therapeutic stimulus of paralyzed facial muscles. Facial current is generated between an upper electrode (30) above the eyes and a lower electrode (31) on the chin, the facial current in sinusoidal or pulsed form being sub-threshold so as to avoid any muscle stimulus. Impedance measurements are taken by determining the voltage between symmetrically placed facial electrodes (32, 33), or between electrode pairs consisting of one electrode (35, 36) positioned around the eye, cheek or mouth, and a reference electrode (R) placed on the patient's chin so as to provide an effective bottom point of the Wheatstone bridge formed by the face. The impedance measurements are indicative of muscle paralysis, and provide a simple but reliable method of obtaining data useful for facial movement assessment.
Abstract:
An electrode arrangement for an electrical impedance tomography system comprises a plurality of electrodes (S1-S16) in an array (22) mounted in a support medium (24, 26, 28, 30, 32) for supporting the electrodes adjacent a surface of a volume (12) the electrical conductivity distribution of which is to be measured, for example the thorax or another body part, a pipeline, the ground, and so on. The electrodes are disposed in two groups, the arrangement being such that, in use, one group (R1-R16) will be closer to the surface than the other group (S1-S16). In operation, each pair of electrodes will be stimulated in turn by applying a known current to them. For each stimulated pair, a resulting potential difference will be recorded at the pair of the remaining electrodes which, if stimulated, would produce an electric field with vectors of the electric field produced by the stimulated pair of electrodes.
Abstract:
A method and an apparatus are disclosed for applying a low strength, time varying magnetic field (26) to a selected screening region of a host, and for sensing a responsive magnetic field (28) from a retained ferrous body within the screening region. The excitation field coil is designed to create a region of finite magnetic field within the screening region, and a region of near zero magnetic field. The sensors (24) are placed within the region of near zero magnetic field to minimize the effect of the applied field. The effects of the applied field are further reduced by use of a reference sensor, field compensation coils, and a feedback loop. The magnetic gradient by the sensors (24) is processed to locate and characterize the ferrous body.
Abstract:
A system for measuring changes in the resistance of a living body includes a resistance measuring circuit (20), an amplifier circuit (30), and an indicator circuit (24) in which the amplifier circuit (30) includes a calibration circuit (50) to give a generally constant amplitude response to a given measured input.