Aesthetic method of biological structure treatment by magnetic field

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.

What is this patent about?

’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.

How does this patent fit in bigger picture?

Technical Landscape

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.

Prosecution Position

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.

Claims

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.

Key Claim Terms New

Definitions of key terms used in the patent claims.

Term (Source)Support for SpecificationInterpretation
Impulse duration
(Claim 9)
Impulse refers to a single magnetic stimulus. The magnetic pulses may be generated in monophasic, biphasic or polyphasic regimes. The device has one or more magnetic field generating devices, a switch, and an energy storage device.The specific time length of a single magnetic stimulus, typically measured in microseconds (μs).
Magnetic fluence
(Claim 1)
The invention utilizes electromagnetic field for targeted remodeling of adipose tissue, focused treatment of cellulite, body contouring, skin tightening or skin rejuvenation. The magnetic treatment induces the muscle contraction at higher repetition rates and the contraction is stronger. The repetition rate of the magnetic field is in the range of 1 to 300 Hz with high magnetic flux density up to 7 Tesla.A measure of the total magnetic energy or exposure delivered to a body region over a treatment period, expressed in units of Tesla squared per centimeter squared (T^2/cm^2).
Muscle contraction
(Claim 1, Claim 9, Claim 16, Claim 23)
The magnetic field is time-varying and high powered therefore the method is based on a value of magnetic flux density sufficient to induce at least muscle contraction. Strong muscle contractions at higher repetition rates cause mechanical movement of all the layers in proximity of the contracted muscle. The magnetic treatment induces the muscle contraction at higher repetition rates and the contraction is stronger.A physical response of the muscle fibers to a time-varying magnetic field with sufficient magnetic flux density to induce motor unit activation for toning, shaping, or volumization.
Oil-cooled
(Claim 16)
Since the therapy requires large currents, significant losses are caused by induced eddy currents within the magnetic field generating device. Eddy currents lead to production of unwanted heat and therefore there is need to sufficiently cool the magnetic field generating device. Smaller diameter and individual insulation of the wires significantly reduces self-heating.A cooling mechanism for the magnetic field generating coil utilizing oil to manage heat generated by large currents and eddy currents during therapy.
Train
(Claim 9, Claim 16, Claim 23)
Pulse refers to a period of treatment by a magnetic field of at least one magnetic stimulus and time duration of no stimulation. Assembling a plurality of magnetic pulses into a train lasting a first time period lasting between 1 second and 30 seconds. The train is followed by a second time period in which no time-varying magnetic field is applied to the patient's muscle.A sequence or assembly of multiple magnetic pulses applied over a specific time period, followed by a period of rest or no stimulation.

Litigation Cases New

US Latest litigation cases involving this patent.

Case NumberFiling DateTitle
1:25-cv-20564Feb 6, 2025Btl Industries, Inc. V. Dna Distribution, Llc

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US10478634

Application Number
US16034793A
Filing Date
Jul 13, 2018
Publication Date
Nov 19, 2019
External Links
Slate, USPTO , Google Patents