A lamp unit includes a flexible base member, a conductive pattern layer forming a conductive pattern on the base member and maintaining a bent shape of the base member when the base member is bent, and LED lamps mounted on the conductive pattern layer and emitting light when a current is applied thereto. A waveform generator that uses loop-form resistive wiring is provided on a substrate. The prosthesis may be configured to churn ingested material and release it from the stomach through a prosthetic pyloric valve.