Patent ID: 6932110

Claim:
A low pressure check valve for use in an infusion set having infusion fluid comprising: (a) a first housing half having an inlet and first lipped sealing ring, the exterior of the first lipped sealing ring in communication with the inlet; (b) a second housing half having an outlet and second lipped sealing ring, the interior of the second lipped sealing ring in communication with the outlet; (c) a gasket with a first portion overlying the first lipped sealing ring and having at least one opening communicating with the interior of the first lipped sealing ring, and another portion overlying the second lipped sealing ring; (d) means for sealing the first and second housing halves together and clamping the gasket portions therebetween; and (e) means for tensioning the gasket portions over the first lipped sealing ring and the second lipped sealing ring, thereby forming a pressure chamber in communication with the second lipped sealing ring exterior and the first lipped sealing ring interior via the one or more gasket openings; whereby infusion fluid flow in the pressure chamber is interrupted by the gasket portion engaging the first lipped sealing ring when the fluid pressure at the inlet is less than the fluid pressure of the pressure chamber, or by the gasket portion engaging the second lipped sealing ring when the fluid pressure at the outlet is less than the fluid pressure of the pressure chamber, or by the gasket portion engaging the first lipped sealing ring when there is a higher pressure at the outlet and pressure chamber as compared to the pressure at the inlet.