An electrostimulator implant includes an implant body, and at least two electrodes disposed on the implant body. The implant is percutaneously injectable into tissue of a subject with a distal portion of a flexible longitudinal member coupled to the implant. The apparatus is configured to be left, for at least 1 day after injection of the implant into the tissue, in a state in which (i) the implant is disposed within the tissue, (ii) the distal portion of the longitudinal member remains coupled to the implant within the tissue, (iii) a proximal portion of the longitudinal member is disposed outside of the tissue, secured to a skin surface of the subject, and (iv) the implant is movable within the tissue by moving the proximal portion of the longitudinal member. The longitudinal member is decouplable from the implant from outside of the subject. Other embodiments are also described.
