A barbed suture for connecting tissue, and a combination surgical needle with a barbed suture. The testing device includes an insulating substrate having an opening formed therein at a position corresponding to the position of the spherical connection terminal, and a contact member, formed on the insulating substrate, including a connection portion which is connected with the spherical connection terminal, at least the connection portion being deformable and extending into the opening. Then the second insulating film is heated to a reflow temperature such that the hole is thermally deformed, flaring as it extends away from the insulating film. In addition, a concave portion is provided so as to extend from the backside surface of the n-type drift region to the p+-type isolation layer. A third subsection acoustically couples the first subsection to the second subsection.