Ultrasonic welding of the header

A suitable arrangement is as follows:

Suitable dimensions are given here (according to general recommendations by various manufacturers of ultrasonic welding equipment):

The area of light fusion for sealing (see above) may be dimensioned like this:

The sealing of the blood space in the header can be done with a rubber ring, as shown above, or with a circular wedge pressed into the polyurethane:

The circular contact area for the sonotrode on top of the header should be at least five times the cross section area of the fusion zone (shown in solid black in the two first drawings above). That means a radial width of at least 2.5 cm.

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