Patent ID: 7997460

Claim:
A continuously sealing one way valve assembly and delivery system for dispensing a flowable substance, comprising: a source for storage of the flowable substance, the source having an opening; a valve assembly coupled to the opening of the source, said valve assembly including (i) an inner core having an inlet opening for receiving the flowable substance into a passageway and at least one port opening from the passageway, (ii) a hollow flexible membrane having a first end and a second end, the first end being thicker than the second end, wherein the hollow flexible membrane is fitted over an outer surface of the inner core and when the flowable substance is placed under pressure the flowable substance exits through the at least one port opening and expands said membrane outwardly from said outer surface of said inner core; a cover enclosing the flexible membrane and having an outlet orifice for dispensing the flowable substance from the valve assembly when pressure is applied to the flowable substance, wherein when the pressure on the flowable substance is released, the first end of the hollow flexible membrane moves back into tightly fitting contact with the outer surface of the inner core before the remainder of the hollow flexible membrane moves back into tightly fitting contact with the outer surface of said inner core, and wherein the source is filled with a preservative free eye care or nasal care product comprising: hyaluronan or derivatives of hyaluronan.