Pressure responsive one-way valve for medical systems

• US 4,244,378 A
• Filed: 05/30/1978
• Issued: 01/13/1981
• Est. Priority Date: 05/30/1978
• Status: Expired due to Term

• Current Assignee: West Corporation
• Original Assignee: West Corporation
• Inventors: Brignola, Dominic J.
• Primary Examiner(s): Howell, Kyle L.
• Application Number:
  US05/910,760
• Time in Patent Office: 959 Days
• Field of Search: 128/2 F, 128/DIG. 5, 128/274, 128/218 NV, 128/214 R, 128/214 C, 137/843
• US Class Current: 600/579
• CPC Class Codes: A61B 5/15003 for venous or arterial blood
• CPC Class Codes: A61B 5/150221 Valves
• CPC Class Codes: A61B 5/150351 Caps, stoppers or lids for sealing or closing a blood collection vessel or container, e.g. a test-tube or syringe barrel caps for bottles or containers in general B65D41/00
• CPC Class Codes: A61B 5/150389 Hollow piercing elements, e.g. canulas, needles, for piercing the skin
• CPC Class Codes: A61B 5/150496 Details of construction of hub, i.e. element used to attach the double-ended needle to a piercing device or sampling device
• CPC Class Codes: A61B 5/150732 Needle holders, for instance for holding the needle by the hub, used for example with double-ended needle and pre-evacuated tube,
• CPC Class Codes: A61B 5/154 Devices using pre-evacuated means
• CPC Class Codes: A61J 1/201 having one piercing end
• CPC Class Codes: A61J 1/2013 having two piercing ends
• CPC Class Codes: A61J 1/2075 for external venting
• CPC Class Codes: A61J 1/2086 for fluid filtration
• CPC Class Codes: A61J 1/2089 Containers or vials which are to be joined to each other in order to mix their contents combinations of vial and syringe for mixing their contents A61J1/2096
• CPC Class Codes: A61M 2039/246 being fixed along all or a part of its periphery
• CPC Class Codes: F16K 15/14 with flexible valve members
• CPC Class Codes: F16K 15/141 the closure elements not being fixed to the valve body
• CPC Class Codes: F16K 15/144 the closure elements being fixed along all or a part of their periphery
• CPC Class Codes: Y10T 137/7879 Resilient material valve

Abstract

A valve assembly comprising a housing having a valve chamber, an inlet at one axial end of the valve chamber and an outlet at the opposite axial end of the valve chamber. A rib surrounds the inlet opening in the chamber. A valve element is mounted in the chamber comprising a generally disc-like body portion having a top face and a bottom face, and a plurality of pedestals depending from the bottom face. The top face of the valve element confronts the rib and the terminal ends of said legs abut the opposite axial end wall of the valve chamber. The axial height of the valve element is slightly greater than the axial depth of the valve chamber between the rib and opposite axial end wall so that a predetermined pressure at the inlet greater than pressure at the outlet is required to open the valve element. The peripheral wall of the valve chamber has at least one flow passage to permit flow from the inlet to the outlet when the valve element is lifted by a predetermined pressure at the inlet.

Claims

1. A valve assembly comprising a housing having a valve chamber, an inlet at one axial end of said valve chamber, a rib depending from said one axial end face circumscribing said inlet and spaced radially outwardly therefrom, an outlet at the opposite axial end of said valve chamber, a disc-like valve element mounted in said chamber comprising a generally disc-like body portion having a top face and a bottom face, and a plurality of pedestals depending from the bottom face, the top face confronting said rib and the terminal ends of said legs abutting said opposite axial end wall of said valve chamber, said annular rib engaging the top face of said body portion in a circular plane extending through the center of said pedestals, the axial height of said valve element being slightly greater than the axial depth of said valve chamber between said rib and said opposite axial end wall and means defining a least one flow passage adjacent the periphery of said valve element, permitting flow from between said inlet and outlet at a predetermined pressure differential to displace said top face of the valve element away from said rib.

2. A valve assembly as claimed in claim 1 including a cannula projecting from one end of said housing in communication with said inlet and a cannula projecting from the opposite end of said valve housing communicating with said outlet.

3. A valve assembly as claimed in claim 1 wherein said flow passage is defined by a plurality of circumferentially spaced cut outs in the peripheral wall of said valve chamber.