Magnetic stimulator prototype design non-invasive uniform pulsed and test functional with fantoma fast oriented bone healing
DOI:
https://doi.org/10.52109/cyp2022438Keywords:
Pulsed magnetic field, triaxial arrangement, phantom, plastinated, source switching, PWM.Abstract
The prototype is non-invasive nature and is made up of an electronic pulse generator circuit, which will be amplified by a 1500 W power source. The electrical power pulse will feed 3 pairs of Helmholtz coils in a triaxial arrangement. These coils will produce a uniform magnetic field crossed over a defined volume that will interact with the fracture to achieve bone tissue regeneration.
The equipment contribution and innovation that it produces a uniform magnetic field crossed in three dimensions, considerably improving the therapy so that the magnetic field will be distributed and interact throughout the volume of the fractured bone.
First, a mathematical model was developed regarding the behavior of the magnetic field. Second, the behavior of the magnetic field in the entire volume of the fractured bone was simulated, that is, the part where the patient will receive the magnetic field as therapy, and where the two Helmholtz coils will separate. For this purpose, three pairs of Helmholtz coils were built.
It should be noted that a study and simulation of the triaxial arrangement of the coils was previously made with the Solid Work software. Likewise, for this purpose, a switched electrical source (switching) of 1500 W of power and a PWM pulse width modulator with a frequency adjustment range of 1 Hz to 100 kHz were acquired, both were connected to a power transistor. to amplify the pulse power.
Regarding the stationary magnetic field, the homogeneity of the field in each Helmholtz coil was studied, knowing the homogeneity of the magnetic field in the three pairs of coils, triaxial disposition studies were carried out for the homogeneity of the magnetic field on the head of a femur, of an acrylic phantom filled with water, and in the plastination of a leg study the behavior of the magnetic field on human tissue characteristics. Finally we process the data with Matlab software to evaluate the magnetic field homogeneity.
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