초록 ▼

A tube for use in a flow controller of an intravenous or other slow flow control apparatus has a configuration somewhat like the opening defined by the open eyelids of the human eye whereby to provide relatively sharp corners and narrow width of the opening to reduce materially the force required to

A tube for use in a flow controller of an intravenous or other slow flow control apparatus has a configuration somewhat like the opening defined by the open eyelids of the human eye whereby to provide relatively sharp corners and narrow width of the opening to reduce materially the force required to close relative to that required to close a round tube and to reduce the movement of the flow control element of the controller, which controller is configured to take advantage of the shape of the tube and employs a shape memory control element to adjust rate of flow of the fluid; the controller also including a brake element to lock the flow rate at a particular preselectable rate.

대표청구항 ▼

An I.V. flow control tube adapted to be used in an I.V. control wherein the metering characteristics of the tube require the repeated controlled closing and time responsive opening of the tube in operation, the tube consisting essentially of a hollow elongated tube of resilient material through whic

An I.V. flow control tube adapted to be used in an I.V. control wherein the metering characteristics of the tube require the repeated controlled closing and time responsive opening of the tube in operation, the tube consisting essentially of a hollow elongated tube of resilient material through which fluid may flow, said tube having a reformed section which has an internal cross-section defined by symmetrical catenary shaped wall portions joining approximately tangentially in opposed sharp internal corners, said section of said tube having a center region having an internal radius for each catenary shaped wall portion, said section of said tube having end regions each having an external reverse radius for each wall portion such that the wall portions join approximately tangentially in opposed sharp internal corners and wherein the internal radii and said external reverse radii are approximately equal within the range of about 0.75 to 1.25, said wall portions capable of being moved toward each other to flatten said tube and control fluid that may flow therethrough, the shape of said cross-section in combination with resilient recovery forces inherent in said material producing a residual reopening force.