Injecting cells such as fat cells into tissue, to act as a filler material, distributed evenly and reasonably thinly so all the injected cells are near a blood supply. The flow of cells out relates directly to the rate at which the tip of the cannula (115) penetrates the tissue. The apparatus has a skin surface sensing means (tubular sleeve) (129) coupled to a plunger (127) in a reservoir ( 133) of the cells. The skin surface sensing means (129) contacts the surface of the skin and remains butted against the skin while the cannula is pushed further into the organic tissue. The cannula (115) initially retracts a predetermined amount relative to the body (137) to close valve (147) between the reservoir (113) and a material supply line through the handle (139). Springs (135 & 149) bias the sensing means (129) and cannula (115) to refill the reservoir (113).
