Harmac Medical Products, Inc.

Scott H DeWitt

Floyd V Edwards

A check valve for disposable pressure infusion systems having an inflation bulb with a single open end includes a valve body with a pair of intake ports and a discharge port. Disposed at such single open end of the inflation bulb, one of the intake ports permits a flow of pressurizing air from the inflation bulb when squeezed to a pressure cuff through flexible tubing coupled to the discharge port. A flexible diaphragm having slitted openings is disposed within the check valve which provides for opening and closure of a specific port alternatively during squeezes and release of the inflation bulb.

Slitted pressure cuff check valve

A check valve, including an inlet housing portion and outlet housing portion which are adapted to be snap-fit together, is inexpensively and quickly produced using valve disks which are capable of providing variable fluid flow resistance. The valve disk is stamped from flexible materials having a Shore A durometer hardness in the range of from about thirty to about one hundred (e.g., a thermoplastic elastomer). Flat, circular shapes having at least three, arcuately-shaped windows defined therein, with an outer sealing periphery being joined to a circular closing member by webs which separate the windows, provide a valve disk of substantial manufacture ease. The check valve is adapted to be used in primary and secondary solution lines, and its variable resistance to fluid flow is enable by merely increasing or decreasing the combined surface area of the windows, increasing or decreasing a preload provided by extending a valve seat in the inlet housing towards the valve disk, increasing or decreasing thicknesses of a valve disk, or varying the proportion of the diameters of the closing member to the valve seat.

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Lockport, NY, United States of America

Scott H DeWitt