A medical device includes a steering unit at a proximal portion of a catheter to steer operations of a heating unit at a distal portion of the catheter. The steering unit includes a main body portion interlocked with the catheter a slide portion interlocked with the heating unit and slidable relative to the main body portion a guide unit interlocked with the main body portion and fixed to the slide portion for movement therewith and an input connector electrically connected with the heating unit and connectable with an output connector for supplying electric energy to the heating unit. The guide unit hinders connection between the input connector and the output connector. A cutout portion enables connection between the input and output connectors when the guide unit moves with respect to the main body portion and the heating unit moves to a position at which the biological tissue is heatable.
