Limfa Therapy System (Limfa Therapy)

The Limfa Therapy System is a non-invasive medical device that generates pulsed, low-frequency (2-80 Hz) electromagnetic fields to temporarily increase blood circulation in healthy leg muscles and stimulate muscles to improve performance. It consists of a control console and either localized emitters or a full-body mat, and is used in hospitals, physician offices, and home settings.

Limfa uses variable bipolar waveforms with ultra-short 1 µs pulses at a 100 kHz carrier frequency, modulated at therapeutic frequencies, achieving up to 190 µT average flux density. The predicate (Bemer) uses fixed monopolar sinusoidal waveforms at 10-30 Hz with 10-33 µs pulse duration and up to 100 µT flux density. Both operate in the ELF range with comparable frequency overlap and intensity ranges, though Limfa offers extended timer flexibility (20-53 minutes vs. 8-20 minutes) and operates at 3 times weekly versus daily use recommendations.

EN 60601-1, EN 60601-1-2, EN 60601-1-6, EN 60601-1-11, EN 62304, EN 62353, EN 62366, EN ISO 14971, EN ISO 15223-1, IEC 60601-1, IEC 60601-1-2, and IEC TR 60601-4-2 for electromagnetic compatibility, safety, software lifecycle, risk management, and device labeling.

Limfa is substantially equivalent because it shares identical indications for use, sites of use, system components architecture, and primary mode of action (non-invasive magnetic field tissue stimulation) with the Bemer predicate devices. Although Limfa employs different waveform generation techniques (variable bipolar modulation versus fixed sinusoidal), both systems deliver low-frequency pulsed electromagnetic stimulation within overlapping and comparable ELF frequency and intensity ranges, raising no new safety or effectiveness concerns. The differences in waveform shape, pulse duration, and timer range are engineering variations that do not alter the fundamental therapeutic objective or create new risks, as all devices comply with the same electrical safety standards (IEC 60601-1) and achieve comparable electromagnetic doses.