Silk is purified to eliminate immunogenic components and is used to form fabric that is used to form tissue-supporting prosthetic devices for implantation. The panels are removably engageable by an interconnection frame along the vertical edge of each panel having through holes providing for fastening with threaded devices. The ear hook is preferably substantially c-shaped and dual molded. When the energy efficiency of the motor is lower than a predetermined level, the control apparatus performs on-off control by alternately turning off the motor. When the tenon projection and the mortise slot are engaged with each other, the conduction portions are electrically connected with each other.