Which patents exactly do feel have significant value?
All of the original patents (the basic technology of the device) expired long ago. I know they have some more recent IP, but isn't it mostly about how to attach the device, back belt, insole version, different applicator tapes, etc?
If there is any value to be had here, it is in building a brand (which they have not succeeded at). The technology itself is probably not protected in a robust way anymore.