Respiratory mask having a rigid or semi-rigid, insert-...

Details Respiratory mask having a rigid or semi-rigid, insert-... Respiratory mask having a rigid or semi-rigid, insert-...

A - Human Necessities

62

B

183/17, 18/76, 2

A62B 23/02 (2006.01) A62B 18/02 (2006.01) B29C 45/14 (2006.01)

Patent

CA 1322969

Abstract A filtering device, such as a respiratory mask, comprising porous, rigid or semi-rigid filtration element with inflow and outflow faces separated by a peripheral surface where the filtration element is supported by a resin mount, which may be in the form of the facepiece of a respiratory mask, that seals the surface without significantly penetrating beyond the surface pores of the filtration element. The filtering device is made by inserting into an injection mold the filtration element and injecting resin into the flow channel of the mold at a pressure and temperature such that the resin does not significantly penetrate beyond the surface pores of the peripheral surface. An inhalation plenum can be formed at the same time by inserting into the flow channel a thin layer of a second resin that does not melt at the pressure and temperature of the first resin.

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