Facebook does not allow the sales of any “medical” device. I know this because I just tried to list a wheelchair and got flagged. Checked through their terms of service and medical stuff was listed as one of the things you can't sell.
Can you sell medical equipment on Facebook?
Healthcare products: Posts may not promote certain healthcare products and services, including medical devices, smoking cessation products containing nicotine, body parts or fluids, or posts that contain “before and after” images. Medical devices: Posts may not promote the sale of medical devices.Jan 25, 2019
What items Cannot be sold on Facebook marketplace?
- Adult products or services.
- Alcohol.
- Animals.
- Digital media and electronic devices.
- Event tickets.
- Gift Cards.
- Healthcare items (thermometers, first-aid kits, etc)
- Illegal, prescription or recreational drugs.