Patent ID: 8092432

Claim:
An outdwelling cup-shaped one-piece medical slit valve, having a longitudinal axis, for use with a medical patient comprising: a one-piece body comprising: a hollow proximal flange, the flange being outwardly radially disposed away from the axis for securing the slit valve within a housing external of the patient; a hollow central valve portion comprising an intermediate valve section connected to and extending distally of the flange and comprising a wall defining a hollow interior, the wall comprising a substantially uniform thickness and a distal end; a normally closed distal valve section attached to the distal end of the wall of the intermediate valve section; the distal valve section comprising at least one planar flat comprising spaced parallel flat surfaces against which an influent-directed and effluent-directed pressure differential is imposed on the parallel surfaces of the at least one planar flat, the at least one planar flat having a thickness substantially less than the thickness of the region of the central valve portion immediately adjacent to the planar flat; at least one normally closed slit disposed in the at least one planar flat extending between the exterior and interior surface thereof which slit comprises normally closed yieldable lips which selectively open to accommodate fluid flow through the slit in either of two directions responsive to predetermined pressure differentials.