Patent ID: 8685708

Claim:
A device comprising: a body having a chamber with an inlet; a membrane positioned in the body, the membrane having a first side and a second side, wherein the inlet is positioned on the first side of the membrane; a plurality of channels coupled to the bottom of the chamber, wherein the plurality of channels are positioned on the second side of the membrane, wherein each of the plurality of channels extends outwardly from the membrane, the plurality of channels including at least a first channel and a second channel, wherein the first channel extends outwardly from a central portion of the membrane, and wherein the second channel extends outwardly from a peripheral portion of the membrane, wherein the membrane includes at least a first zone and a second zone, and there is a barrier which separates the first zone from the second zone, and wherein the chamber body comprises a plurality of downwardly extending feet spaced around a perimeter of the chamber, with a plurality of passages formed between the feet configured such that fluid can pass from the chamber into the second zone of the membrane.