I do not believe that these are regulated medical devices but you may want to make sure that they can legally be rented and if they can be commercially distributed in “used” condition without a specific sanitation procedure. Another consideration is liability insurance - especially given all of the contra-indications from the Normatech website:
“Do not use this product if you are experiencing inflammation, an infection, pain of unknown origin, or bleeding (internal or external) at or near the site of application or if you have a wound at or near the site of application. Do not use this product if you are under the care of a physician or have a contraindication requiring the use of any medical device. Do not use this product on sensitive skin or in the presence of poor circulation. Do not use this product if you have any of the following conditions: acute pulmonary edema; acute thrombophlebitis; acute congestive cardiac failure; acute infections; deep vein thrombosis (DVT) or blood clots; episodes of pulmonary embolism; wounds, lesions or tumors at, or in the vicinity of, application; where increased venous and lymphatic return is undesirable; bone fractures or dislocations at, or in the vicinity of, application.”
John