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NASAL AND ORAL CANNULA HAVING TWO CAPABILITIES AND METHOD OF PRODUCING SAME

  • US 20100139664A1
  • Filed: 07/28/2009
  • Published: 06/10/2010
  • Est. Priority Date: 06/17/2005
  • Status: Active Grant
First Claim
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1. A method of forming a cannula comprising the steps of:

  • assembling a cannula mandrel assembly comprising separable engageable parts including a facepiece mandrel and a pair of mouthpiece/nasal mandrels, an intermediate section of the facepiece mandrel being provided with a pair of spaced apart through holes for each receiving a remote free end of one of the mouthpiece/nasal mandrels and allowing the facepiece mandrel to slide along the pair of mouthpiece/nasal mandrels, and each of the mouthpiece/nasal mandrels having a stop feature, with a larger transverse cross section, which prevents further sliding movement of the facepiece mandrel along the pair of mouthpiece/nasal mandrels and while also avoiding flow of a polymeric material between the facepiece mandrel and the mouthpiece/nasal mandrels;

    heating the cannula mandrel assembly to a desired temperature;

    providing an uncured polymeric material in flowable state;

    applying at least one coating of the uncured polymeric material to the cannula mandrel assembly to provide a desired material thickness coating on the cannula mandrel assembly;

    at least partially curing the coating of the polymeric material on the cannula mandrel assembly to form the cannula;

    disassembling the cannula mandrel assembly by first sliding both the facepiece mandrel and the formed cannula along the mouthpiece/nasal mandrels toward the remote free ends of the mouthpiece/nasal mandrels until the facepiece mandrel and the partially cured cannula are completely removed from the pair of mouthpiece/nasal mandrels; and

    thenwithdrawing the facepiece mandrel from the formed cannula.

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