Double-Faced Coil Electromagnetic Shockwave Transducer
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Solution Overview
Problem
Existing electromagnetic shockwave transducers are limited in producing high-frequency acoustic waves due to mechanical and electrical resonances, resulting in inadequate force generation and non-uniformity, and are not suited for generating rarefaction waves effectively.
Innovation Solution
The development of electromagnetic shockwave transducers with double-faced coils, where high voltage is applied between the coil ends and the inter-winding voltage is managed by the number of windings, allowing for a thin or non-elastic separator, and the use of current pulses to produce uniform and greater forces, enabling the generation of both compression and rarefaction shockwaves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If two parallel spiral coils with elastic separator are used to generate acoustic waves, then mechanical resonance can be tuned, but the electric field between coils is limited and force generation is insufficient
Solution Approach 1:
The coil is divided into two faces (first and second coil faces) that are closely spaced and can be independently controlled. This segmentation allows each face to contribute to force generation without the limitations of opposing polarities in traditional two-coil systems, thereby increasing the electric field strength and force generation capability.
Solution Approach 2:
The invention transitions from a traditional two-coil arrangement with significant spacing to a double-faced coil structure where the two active surfaces are in close proximity. This dimensional change enables a much stronger electric field between the faces while maintaining structural simplicity.
2Adaptability or versatility
If traditional electromagnetic transducer design is used, then compression waves can be generated, but rarefaction waves cannot be effectively produced
Solution Approach 1:
The transducer uses pulsed direct current that can be dynamically adjusted in polarity and timing. By controlling the direction and duration of current pulses through the coil faces, the system can dynamically switch between generating compression waves and rarefaction waves, providing versatility for different medical applications.
Solution Approach 2:
The invention changes the electrical parameters (current polarity, pulse duration, pulse timing) to control the mechanical response of the coil faces. By varying these parameters, the transducer can generate different types of pressure waves (compression or rarefaction) with appropriate amplitudes for specific therapeutic needs.
3Manufacturing precision
If high voltage is applied between coil ends, then inter-winding voltage becomes excessive, but force uniformity across coil area is poor
Solution Approach 1:
An insulator is introduced as an intermediary component between the two coil faces. This insulator allows high voltage to be applied between the coil ends while preventing electrical breakdown between the closely spaced faces. The insulator thickness and material properties are selected to withstand the applied voltage while maintaining close spacing for strong electric field generation.
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
The solution enables the production of more uniform and greater forces, allowing for the generation of both compression and rarefaction shockwaves, effectively addressing the limitations of prior art transducers and expanding their applicability to higher frequency waves and various medical applications.
Implementation Method 1
A current pulse applied to the surface coil induces eddy current in the thin conductive membrane. The membrane is then repelled and gives rise to acoustic waves
Implementation Method 2
A current pulse applied to the surface coil induces eddy current in the thin conductive membrane. The membrane is then repelled and gives rise to acoustic waves
Implementation Method 3
Waves are also reflected from the backing material due to its high acoustic impedance
Data Source
AI summary
An electromagnetic shockwave transducer includes a double-faced coil of wire wound around an insulator. The coil has a first coil face on one side of the insulator and a second coil face on an opposite side of the insulator. Coil ends of the coil are electrically coupled to a current source, which produces a current pulse in the coil so as to produce a force between the coil faces.