Patent No. US10478634 (titled "Aesthetic method of biological structure treatment by magnetic field") on Jul 13, 2018. The application was issued on Nov 19, 2019.
’634 is related to the field of non-invasive aesthetic medicine, specifically utilizing high-intensity time-varying magnetic fields to influence biological structures. The technology addresses the limitations of traditional thermal or mechanical treatments, which often fail to provide significant muscle shaping, toning, or volumization. By inducing deep electric currents within the tissue, the system targets neuromuscular plates to trigger muscle contractions that are stronger than those achievable through voluntary exercise.
The underlying idea behind ’634 is the use of high-powered magnetic flux densities to induce supramaximal contractions, which force muscle tissue to adapt through structural remodeling, hypertrophy, and hyperplasia. The invention recognizes that high-repetition-rate magnetic pulses not only strengthen muscle but also trigger a metabolic chain reaction—specifically ER stress and the release of free fatty acids—that leads to the apoptosis of adjacent adipose cells. This dual-action mechanism allows for simultaneous muscle building and fat reduction in targeted areas like the abdomen and buttocks.
The claims of ’634 focus on a method for body shaping and muscle toning that involves placing one or more applicators containing magnetic field generating coils in contact with a patient’s skin or clothing. The independent claims specify the application of a magnetic fluence between 50 T·cm² and 1,500 T·cm² and the use of specific hardware parameters, such as energy storage devices with capacitances up to 100 mF and coils with inductances ranging from 1 nH to 50 mH. The claims also cover the delivery of magnetic pulses in structured trains and bursts, where active stimulation periods are followed by specific relaxation intervals to optimize the physiological response.
In practice, the system utilizes an adjustable flexible belt to secure the applicators, which may be oil-cooled to manage the significant heat generated by high-current discharges. The device generates magnetic flux densities between 0.1 and 7 Tesla, delivered at repetition rates up to 700 Hz. By assembling these pulses into trains lasting between 1 and 30 seconds, the invention creates a rhythmic cycle of intense work and rest for the muscle, effectively mimicking and surpassing the intensity of a high-intensity interval training (HIIT) session without physical exertion from the patient.
This approach differs from prior solutions by providing a truly non-contact, non-thermal means of body contouring that reaches deep muscle groups often inaccessible to surface-level treatments like RF or ultrasound. Unlike traditional electrical muscle stimulation (EMS), which can be painful due to high current density at the skin surface, the time-varying magnetic field passes through the skin and fat layers without resistance, focusing energy directly on the motor neurons. This results in a more homogenous and comfortable treatment that can be administered through clothing while achieving superior results in circumferential reduction and muscle definition.
In the mid-2010s when ’634 was filed, non-invasive aesthetic procedures were typically implemented using standalone systems that relied on a single energy modality, such as radiofrequency, ultrasound, or laser energy, to target specific tissue layers. At a time when these systems commonly relied on thermal or mechanical mechanisms to affect adipose tissue or skin elasticity, the ability to simultaneously address underlying muscle structures was limited by hardware constraints that made high-intensity magnetic stimulation non-trivial. Engineering challenges of the era, particularly the management of significant heat generated by eddy currents in high-power magnetic coils, often necessitated bulky cooling systems or restricted the duration and intensity of the magnetic flux density that could be safely applied to biological structures.
The disclosed invention represents a meaningful technical advancement through the architectural integration of high-intensity time-varying magnetic fields with secondary treatment modalities, such as radiofrequency, light, or mechanical waves. This integration enables a multi-layered physiological effect where targeted muscle contractions are synchronized with thermal or mechanical tissue remodeling, overcoming the technical constraint of treating superficial and deep tissues in isolation. The structural solution utilizes a specialized magnetic field generating device composed of finely insulated wires with specific diameter constraints to significantly reduce self-heating and energy loss from eddy currents. This architectural shift allows for higher repetition rates and magnetic flux densities up to 7 Tesla, achieving the technical effect of enhanced muscle toning and increased apoptotic index in adipose tissue while maintaining thermal homogeneity and device efficiency.
The patent contains 30 claims, with claims 1, 9, 16, and 23 serving as the independent claims. These independent claims focus on methods for muscle toning and body shaping, specifically targeting the abdomen or buttocks, by applying time-varying magnetic fields through one or more applicators to induce muscle contractions. The dependent claims serve to further specify technical parameters such as magnetic flux density, pulse repetition rates, and duty cycles, while also detailing hardware components like oil-cooled coils, energy storage specifications, and the use of adjustable belts or thermal treatments to refine the therapeutic application.
Definitions of key terms used in the patent claims.
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