Venting assembly for a sealed body fluid drainage device

Claim 1

In a closed body fluid drainage system having a fluid retaining drainage bag with a body engageable fluid drainage tube extending therefrom, a vent assembly, said assembly forming a gas path from the system to the exterior thereof, said assembly comprising first and second filters, spacer means retaining said filters in spaced relation to each other along said path to define a space therebetween, said first filter being positioned inward of said second filter and formed of a gas permeable liquid-repellent material capable of precluding outward movement of liquid therethrough from the drainage system, said second filter being formed of a gas permeable bacteria barrier material, said first filter shielding said second filter from wetting through outward movement of liquid through said passage and thereby preserving the effectiveness of the bacteria filter barrier, a filter mounting housing receiving said filters, said housing having a fluid flow passage defined therethrough, said filters being received within said passage in stacked spaced relation to each other, said mounting housing including a filter supporting inner shoulder within said passage, and a filter retaining outer cap, said filter retaining outer cap including a depending tube-receiving tubular extension and a depending peripheral wall, said filters being annular and received about said extension and confined within said wall.