Surgery – Respiratory method or device – Means for removing substance from respiratory gas
Patent
1987-09-25
1988-12-13
Michalsky, Gerald A.
Surgery
Respiratory method or device
Means for removing substance from respiratory gas
55490, 264274, A62B 2302
Patent
active
047903066
ABSTRACT:
A filtering device is made by inserting into an injection mold a porous, rigid or semi-rigid filtration element that has inflow and outflow faces separated by a peripheral surface and then injecting resin into the flow channel of the mold at a pressure and temperature such that the resin does not significantly penetrate into the peripheral surface beyond its surface pores. The resin can be a thermoplastic rubber and can form the facepiece of the resirator mask. An inhalation plenum for the mask can be formed at the same time by inserting into the flow channel of the mold a thin layer of a second resin which substantially does not melt at the pressure and temperature at which the first resin is injected. A complete respirator mask can be produced at a single station in a single insert-molding operation by inserting an exhalation valve and harness attachments together with said filtration element before injecting the first resin. Hence, the respiratory mask can be manufactured inexpensively while affording extraordinarily long service life.
REFERENCES:
patent: 3861381 (1975-01-01), Witman et al.
Braun David L.
Melvin Donald L.
Michalsky Gerald A.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Tamte Roger R.
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