Diathermy Applicator Wire Spacing Optimization
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Solution Overview
Problem
Patients undergoing diathermic deep-heating treatments often experience superficial skin burning due to capacitive coupling of electrical energy through wire insulation, which is not fully addressed by existing solutions that focus on insulation improvements or fringing field absorption, as these methods either fail to eliminate surface heating or compromise beneficial magnetic heating effects.
Innovation Solution
The use of conformal mapping and Laplacian modeling to optimize wire spacing and geometry in diathermy applicators, accounting for fringing effects and thermal distributions, allows for the reduction of capacitive coupling while maintaining effective magnetic heating by determining an optimal spacing pattern that minimizes surface burning without diminishing deep heating effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If better insulation is used for applicator wiring, then capacitive coupling is reduced, but manufacturing cost increases and bend radius is compromised
Solution Approach 1:
The patent applies different wire spacing configurations at different locations along the applicator. Specifically, the spacing between adjacent turns of the solenoid winding is varied along the length of the applicator to compensate for fringing effects at the ends, where capacitive coupling is stronger. This local variation in spacing optimizes the distribution of capacitive coupling without requiring changes to the insulation material throughout the entire applicator.
Solution Approach 2:
The patent changes the geometric parameter of wire spacing to control capacitive coupling. By adjusting the distance between adjacent wire turns, particularly reducing spacing at fringing regions (ends of the applicator) and increasing spacing in the central region, the patent optimizes the uniformity of capacitive coupling across the treatment area, thereby reducing superficial skin burning without modifying insulation properties.
2Object-affected harmful factors
If fringing fields are absorbed using additional parts, then surface heating is reduced, but device complexity increases
Solution Approach 1:
The patent modifies the wire spacing configuration specifically at the fringing regions (ends of the applicator) where capacitive coupling is strongest. By localizing the spacing adjustment to these problematic areas rather than uniformly changing the entire applicator structure, the patent reduces surface heating without adding complex additional components throughout the device.
Solution Approach 2:
The patent extracts and addresses the fringing field problem by isolating the end regions of the solenoid winding as the source of excessive capacitive coupling. The solution involves modifying only the wire spacing at these extracted fringing regions rather than adding additional parts to the entire device, thereby simplifying the overall device structure while still addressing the surface heating issue.
3Manufacturing precision
If wire spacing is reduced to eliminate fringing effects, then capacitive coupling uniformity is improved, but magnetic heating effectiveness is diminished
Solution Approach 1:
The patent applies different wire spacing strategies to different regions of the applicator. The central region maintains tighter wire spacing to preserve strong magnetic heating effects, while the end regions (fringing areas) use adjusted spacing to compensate for excessive capacitive coupling. This regional differentiation allows simultaneous optimization of both magnetic heating effectiveness and capacitive coupling uniformity.
Solution Approach 2:
The patent varies the wire spacing parameter along the length of the applicator to optimize both magnetic heating and capacitive coupling uniformity. By carefully controlling how the spacing parameter changes from the central region to the end regions, the patent maintains strong magnetic fields where needed while reducing fringing effects, achieving a balance between the two competing requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces superficial skin burning by improving the uniformity of capacitive coupling and maintaining the beneficial deep heating effects, ensuring a more comfortable and effective treatment by adjusting wire spacing to counteract fringing and geometric irregularities in diathermy applicators.
Implementation Method 1
the source of the burn problem is that the temperature at the skin-fabric interface is not spatially constant... Laplacian modeling will give the temperature distribution at other locations in the space of interest
Implementation Method 2
These and other observations lead applicants to conclude that burning is caused by electrical energy capacitively coupled through the wire insulation, wherein the capacitance value in question is determined substantially by the dielectric constant of the insulation at the RF frequency used in diathermy
Implementation Method 3
Laplacian modeling will give the temperature distribution at other locations in the space of interest... conformal mapping and Laplacian modeling to optimize wire spacing and geometry in diathermy applicators, accounting for fringing effects and thermal distributions
Data Source
AI summary
A therapeutic diathermy applicator is proposed which minimizes the common problem of burning of patients' skin. The heat distribution arising as a result of unwanted capacitive effects is modeled as a manifestation of ‘conservative’ energy. A specific spatial characteristic of RF stimulation is determined and incorporated into the design of the applicator in order to achieve these goals.