A suture thread is used to perform suturing without tying part of or the whole of knots that are supposed to be tied during suturing. The combination network has a plurality of client terminal units connected thereto. The second conductive unit includes a tempered glass substrate formed of tempered glass by an etching process, a second ITO coating layer coated on an upper surface of the tempered glass substrate, and a second electrode printed on an edge of an upper surface of the second ITO coating layer. Light emitted at other angles does not impinge on the external mirror.