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US 5,147,333 AGranted
Needleless injection port with automatic backcheck valve
AssigneeBurron Medical Inc.
InventorKenneth Raines
Life of this patent
Estimating the term…
Abstract
A needleless injection port and automatic backcheck valve comprises a generally tubular body having a pair of vertically offset ports extending laterally therefrom, and a spool within the bore for controlling communication between the ports. The spool is urged by a spring toward one end of the bore, which is open so that a syringe tip can be inserted to displace the spool from a position in which the ports communicate to a position in which they are isolated and secondary medication can be injected from the syringe.
Claims4
A needleless injection port and automatic backcheck valve comprising
- a generally tubular body having a bore extending along a first axis,
- a pair of ports extending laterally from said body, each port being in communication with said bore, and said ports being offset along said axis,
- a spool inserted within said bore, said spool having a pair of rims defining an annular space therebetween,
- means for biasing said spool toward one end of said bore,
- said spool being axially movable between a first position in which said ports are in fluid communication with one another via said annular space, and a second position in which one of said rims blocks such communication,
- one end of the body having an opening into which a syringe tip can be inserted to move said spool from said first position to said second position, whereupon the syringe is in fluid communication with only one of said ports,
- wherein said body has a luer fitting at one end for receiving a syringe, the fitting including a luer taper of lesser diameter than said bore, thus defining a circumferential ledge at one end of the bore which provides a stop for the spool, and
- the spool has a cylindrical extension at one end, said extension fitting closely within said luer taper, and having a bead at its distal end which bears against the luer taper, forming a seal therewith.
5 more elements
A needleless injection port and automatic backcheck valve comprising
- a generally tubular body having a bore extending along a first axis,
- a pair of ports extending laterally from said body, each port being in communication with said bore, and said ports being offset along said axis,
- a spool inserted within said bore, said spool having a pair of rims defining an annular space therebetween,
- said spool being axially movable between a first position in which said ports are in fluid communication with one another via said annular space, and a second position in which one of said rims blocks such communication,
- one end of the body having an opening into which a syringe tip can be inserted to move said spool from said first position to said second position, whereupon the syringe is in fluid communication with only one of said ports,
- a coil compression spring bearing against the end of the spool opposite the end adjacent the opening, for biasing the spool toward the opening, and
- a cap for retaining the spring within the bore,
- said cap having a downturned flange which fits over one end of the body, the body having a circumferential groove thereon, and said flange having a corresponding internal circumferential rib which snaps into the groove when the valve is assembled.
5 more elements
A needleless injection port and automatic backcheck valve comprising
- a generally tubular body having a bore extending along a first axis,
- a pair of ports extending laterally from said body, each port being in communication with said bore, and said ports being offset along said axis,
- a spool inserted within said bore, said spool having a pair of rims defining an annular space therebetween,
- means for biasing said spool toward one end of said bore,
- said spool being axially movable between a first position in which said ports are in fluid communication with one another via said annular space, and a second position in which one of said rims blocks such communication,
- one end of the body having an opening into which a syringe tip can be inserted to move said spool from said first position to said second position, whereupon the syringe is in fluid communication with only one of said ports,
- wherein each of said ports intersects said bore at an opening which is partially obstructed by a dam, to reduce the required stroke of the spool.
4 more elements
Dependencies are inferred from the claim text.