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A check valve for providing mono-directional flow in medical devices. The check valve includes a valving means comprised of a valve member and a seat member disposed within a cylindrical channel. The valve member is coaxially aligned within the channel downstream of the seat member and provides a va

A check valve for providing mono-directional flow in medical devices. The check valve includes a valving means comprised of a valve member and a seat member disposed within a cylindrical channel. The valve member is coaxially aligned within the channel downstream of the seat member and provides a valve cavity into which a portion of the seat member is disposed. The interface between the valve member and the seat member creates a seal length. The valve member is radially stressed by the axial position of the seat member so that the sealing force along the seal length is substantially radial. Fluid flow passes through an axial bore in the valve seat member and upon sufficient pressure unseats the seal length and passes through the annular passageway between the valve member and the seat member.

대표청구항 ▼

A check valve for regulating fluid flow, said check valve having a forward flow direction in which flow through said valve occurs at a predetermined cracking pressure and a reverse flow direction in which flow through said valve is prevented, said check valve comprising: a housing comprising a chann

A check valve for regulating fluid flow, said check valve having a forward flow direction in which flow through said valve occurs at a predetermined cracking pressure and a reverse flow direction in which flow through said valve is prevented, said check valve comprising: a housing comprising a channel having an inlet section and an outlet section, said inlet and outlet sections comprising respective luer fittings for connection to medical devices; a seat member including a seating portion, said seat member including a passageway; a valve member, said valve member including a body portion and an elastomeric valve flange portion forming a valve cavity which receives said seating portion to form a sealing interface therebetween over a seal length L, said valve flange portion (i) being sealed to said body portion to prevent fluid flow therebetween, and (ii) being axially positioned with respect to said seating portion to provide a force which urges said valve flange portion against said seating portion to yield a predetermined cracking pressure for said check valve, said force being comprised of an axial component and a radial component, said members being configured such that said radial component is substantially greater than said axial component, said elastomeric valve flange portion expanding in response to positive fluid pressures greater than said cracking pressure at said inlet section to form an area between said valve flange portion and said seating portion for passage of fluid therebetween, said members configured to at least maintain said seal length L in response to substantial reverse pressure to prevent fluid flow in said reverse flow direction, said body portion being retained by a portion of said housing to prevent axial movement of said valve member away from said seat member in said forward flow direction.