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US 7,468,116 B2Granted
Conduit and method of forming
AssigneeFisher & Paykel Healthcare Limited
InventorsDaniel John Smith, Nathan Lee Gray, Blair Victor Skelton
Life of this patent
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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.
Claims3
A method for removing a releasable inner layer from within a conduit comprising:
- placing said conduit, including said inner layer around an elongate shaft having a longitudinal slot,
- forming an adequate seal toward a first end of said shaft, effective for the conduit to at least substantially seal said slot, from the surroundings, apart from at the other end of said shaft,
- applying suction to said slot,
- initiating release of said inner layer from said conduit,
- removing said conduit from said shaft after said inner layer is released from said conduit.
2 more elements
An apparatus for assisting removal of a releasable inner layer within a conduit comprising:
- an elongate shaft having a longitudinal slot,
- a effective sealing means for making an adequate seal between said inner layer and said shaft, toward a first end of said shaft,
- a means to suck gases from said slot, and release said inner layer from said conduit.
Dependencies are inferred from the claim text.