A method and implant based on injection molding techniques. The guiding of the piston with respect to the cup and the sealing of the thermo-expandable substance are provided by the same arrangement of a single-piece holder comprising a rigid insert for guiding the piston which is embedded into a flexible envelop impermeable to said thermo-expandable substance and is interposed between the insert, the piston and the cup. The system can include an optical connector having a non-contact portion configured to couple optical digital signals between the first signal converter and the optical digital signal link across a gap. The ultraviolet lamp and a bulb extends through both compartments and the baffle to purify the water. Cellular small molecule libraries, methods of identifying tissue sources, methods for treating genetic and non-genetic diseases, and methods for predicting the efficacy of drugs are also discussed. The dent portion includes a concave side wall, which faces the first body member, having a cable hole portion through which the high-voltage cable is installed.