Yes, but it goes much deeper than any TENS can go. There are other types of surface stimulators now (the name eludes me) that can go somewhat deeper than a TENS.

The chair massage units I mentioned are supposed to be a cheaper version of the massage chairs you see at malls. They have moving (and some vibrating/heated) balls that follow various paths (depending on the unit and settings) to massage upper, middle, lower, and combinations. I don't think they would be problematical for your stimulator, but I can't say that with any certainty; it should be easy enough to determine just by looking at them and maybe trying one without leaning against it until you feel confident. There may also be information on the box as to what other medical paraphernalia it can be safely used with.

Doc