Method and apparatus for isolated transformation of a first voltage into a second voltage for measurement of electrical bioimpedances or bioconductances
First Claim
1. Apparatus for isolated transformation of a first voltage into a second voltage for measurement of electrical bioimpedances or bioconductances primarily of biological tissues, in particular of the human body, by means of an active electronic measurement device including a motor (15) operated by the first voltage, a generator (16) which is driven by the motor and which generates the second voltage independent of the Ground potential of the first voltage, and at least one coupling means between the motor and the generator made of electrically isolating material featuring a dielectric constant of approximately 1 and such a dimension that the capacitance of the generator related to Ground is not more than 10 pF, in particular 5 pF.
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Accused Products
Abstract
An apparatus for isolated transformation of a first voltage into a second voltage includes a motor (15), which is powered by the first voltage and whereof the motor drives a generator (16) utilizing a coupling means, for example, a shaft (17) or a belt drive, whereof the rotation of the shaft generates the second voltage off the generator (16). At least a portion (18) of the coupling means, for example, the shaft (17), is made of an electrically isolating material featuring a dielectric constant of approximately 1 and is of such a dimension that the capacitance of the generator related to Ground is at maximum 10 pF, preferably 5 pF. The apparatus is in particular suited to provide a voltage for supply of electronic measurement devices, which are used for impedance measurements at the human body because the apparatus meets requirements for medical safety, keeps the electrical capacitance of the measurement circuit powered by the generator at a minimum, does not transform disturbances present at the first voltage to the measurement circuitry, and doesn'"'"'t generate disturbances by itself.
79 Citations
24 Claims
- 1. Apparatus for isolated transformation of a first voltage into a second voltage for measurement of electrical bioimpedances or bioconductances primarily of biological tissues, in particular of the human body, by means of an active electronic measurement device including a motor (15) operated by the first voltage, a generator (16) which is driven by the motor and which generates the second voltage independent of the Ground potential of the first voltage, and at least one coupling means between the motor and the generator made of electrically isolating material featuring a dielectric constant of approximately 1 and such a dimension that the capacitance of the generator related to Ground is not more than 10 pF, in particular 5 pF.
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15. Apparatus according to the aforementioned claims whereof a motor control (34) is provided in order to keep the speed of the motor (15) constant.
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19. Apparatus according to one of the aforementioned claims whereof the largest dimension of the motor (15) is 20 cm, preferably 10 cm, and/or the largest dimension of the generator (16) is 20 cm, preferably 10 cm, and/or the shaft extended of the motor (15) and the generator (16) is 10 cm, preferably 5 cm, or more advantageously 3 cm.
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21. Apparatus according to one of the aforementioned claims whereof the motor-generator incorporates a propeller (23) which is mounted preferably onto the motor shaft.
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22. Apparatus according to one of the aforementioned claims whereof the motor or the generator has attached a flywheel for energy storage in order to bridge power failures.
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23. Apparatus according to one of the aforementioned claims, which is incorporated into a soundproof enclosure.
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24. Apparatus according to one of the aforementioned claims, which is integrated into an enclosure of a measurement device to which the apparatus is supplying power.
Specification