A single crystal ingot is cut to an axial direction so as to including the central axis, a sample for measurement including regions V, Pv, Pi and I is prepared, and a first sample and second sample are prepared by dividing the sample into two so as to be symmetrical against the central axis. The resorbable screw fastener is 100% resorbed in vivo during a period of time ranging from about 14 days to about one year after implantation. In a preferred fashion, the sealing lip is elastically deformable for passing the cleaning liquid to the printing material web. The motion converting mechanism is a mechanism for converting rotary motion to linear motion and for applying an operating force to the clutch.