Patent ID: 7892213

Claim:
A fluid flow restrictor for regulating the flow rate of fluid through a fluid supply tube, the supply tube having a distal end and having an internal fluid passageway with a supply tube inner cross-sectional area, the restrictor comprising: a chamber having a distal end and a proximal end, the proximal end of which is in fluid communication with the distal end of the supply tube wherein fluid from the supply tube flows into the chamber through the proximal end of the chamber, the chamber having a chamber length and a chamber inner cross-sectional area that is larger than the supply tube inner cross-sectional area; a restrictor tube having an inner cross-sectional area that is smaller than the supply tube inner cross-sectional area and smaller than the chamber inner cross-sectional area, said restrictor tube having a length, wherein the restrictor tube length and the restrictor tube inner cross-sectional area are configured to result in a desired flow rate, the restrictor tube having a proximal end extending into the chamber from the distal end of the chamber; and a sleeve surrounding the restrictor over less than the entire length of the restrictor tube, wherein the sleeve mounts the restrictor tube such that the proximal end of the restrictor tube projects into the chamber.