The Assisi loop uses "Pulsed Electromagnetic Field Therapy" to treat inflammation in animals. This seems like a bunch of woo.
Does this work?
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There is certainly a lot of peer reviewed literature about it.
This1 literature review's abstract says:
Electromagnetic fields (EMFs) have shown a promising potential for treatment of different wounds. Different techniques have been proposed for wound treatment including electric current therapy (ET), EMF therapy (EMFT), static magnetic field, and combined magnetic field. The present study reviews the most current EMF based methods for wound treatments and compare their efficiency for each wound. In addition the proposed mechanisms of action of these techniques were reviewed. Among different techniques, ET shows more promising effects on wounds. Furthermore, different parameters influence the therapeutic performance of ET and EMFT including electrical intrinsic properties of living organs as well as physical parameters of stimulations. For further development of EMF based treatments for wound it is necessary to develop more quantitative assessments for wound healing.
1 Yadollahpour, A., & Jalilifar, M. (2014). Electromagnetic Fields in the Treatment of Wound: A Review of Current Techniques and Future Perspective. J pure appl microbio, 8(4), 2863-77.