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US 7,291,240 B2Granted
Method of forming a conduit using a wound sacrificial layer
AssigneeFisher & Paykel Healthcare Limited
InventorsDaniel John Smith, Nathan Lee Gray, Blair Victor Skelton
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Abstract
A thin ribbon spirally wound polymer conduit and method of forming, wherein a helical reinforcing bead is interposed adjacent overlapping layers of ribbon. Further, a method of continuously forming spirally wound conduit wherein a sacrificial layer, preferably having a different base polymer to that of the conduit, is first applied to the former before the conduit is formed overtop.
Claims7
A method for continuously manufacturing conduit comprising:
- applying a sacrificial layer of thin plastic around a former in an overlapping pattern, said former rotating and advancing said conduit,
- forming a conduit on said former overtop said sacrificial layer,
- welding said overlapping layers to each other, and
- removing said sacrificial layer from inside said conduit.
1 more element
Dependencies are inferred from the claim text.