Ultrasound thread welding

Abstract

According to an aspect of the present invention, there is provided an apparatus for ultrasonic welding of a removal thread (1) of an intrauterine system (2). The apparatus comprises a welding jig (3) comprising a welding groove (4), the welding groove having a length Lg, a width Wg and a depth Dg and a bottom (5) with concave shape. The apparatus further comprises a sonotrode (6) having a length Ls that is 150-220% of Lg, a width Ws of a welding tip (7) of the sonotrode that is 80-98% of Wg and a depth Ds. Further, the welding tip of the sonotrode has a concave shape.

Dependencies are inferred from the claim text.