| 摘要 |
A double-layer medical catheter with an integral soft tip is made by the coextrusion of a relatively rigid inner layer and a relatively soft outer layer, where the extrusion equipment is configured and so controlled to interrupt the supply of the material for the inner layer to form a periodic void in the inner wall. The act of interrupting the supply causes a ramp down in the inner wall thickness at the leading edge of each void and the ramp up of the thickness at the trailing edge. The void is cut to produce two ideal integral soft-tipped catheters.
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