Patent ID: 7122097

Claim:
An ultrasound horn comprising a fixing section, a sealing section and a transfer section extending therebetween, one or more elongate recesses being formed at least in the transfer section, and said recesses extending in a direction between the fixing section and the sealing section, wherein each of said recesses comprises two sides having portions which abut a rounding-off at an end of the recess located most proximal the sealing section, the portions of the two sides facing one another and being parallel to one another, the rounding-off encompassing, along the rounding-off, at least a first portion with a first radius of curvature, a second portion with a second radius of curvature and a third portion with a third radius of curvature, with the first radius of curvature being different from at least one of the second and third radii of curvature.