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A needleless connector for medical use, adapted to facilitate the flow of fluid therethrough, includes a housing having an inlet port and an outlet port. The connector also includes a flex-tube assembly defining a fluid path between the inlet port and the outlet port. The flex-tube assembly is mova

A needleless connector for medical use, adapted to facilitate the flow of fluid therethrough, includes a housing having an inlet port and an outlet port. The connector also includes a flex-tube assembly defining a fluid path between the inlet port and the outlet port. The flex-tube assembly is movable between uncompressed and compressed states. The flex-tube assembly has a first internal volume when in the uncompressed state and a second internal volume, greater than or substantially equal to the first internal volume, when in the compressed state.

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What is claimed is: 1. A needleless connector for medical use, adapted to facilitate the flow of fluid therethrough, said connector comprising: a housing having an inlet port and an outlet port; and a flex-tube assembly defining a fluid path between the inlet port and the outlet port, the flex-tube

What is claimed is: 1. A needleless connector for medical use, adapted to facilitate the flow of fluid therethrough, said connector comprising: a housing having an inlet port and an outlet port; and a flex-tube assembly defining a fluid path between the inlet port and the outlet port, the flex-tube assembly movable between uncompressed and compressed states, the flex-tube assembly having a first internal volume when in the uncompressed state and a second internal volume, at least as great as the first internal volume, when in the compressed state; wherein the flex-tube assembly comprises: a flex-tube insert having at least one collapsible section movable between uncollapsed and collapsed states; and a flex-tube piston surrounding the flex-tube insert and defining the fluid path, the flex-tube piston including a piston head positioned within the inlet port during the uncompressed state and outside the inlet port during the compressed state, a bore carried by the piston head, the bore closed when the piston head is within the inlet port and opened when the piston head is outside the inlet port, and a piston base proximal the outlet port and in communication therewith, the flex-tube piston responsive to the movement of the flex-tube insert, the flex-tube insert being formed of a substantially rigid material and the flex-tube piston being formed of a resiliently deformable material such that the outer circumference of the flex-tube insert remains in close contact with the inner circumference of the flex-tube piston over the length of the flex-tube insert in the compressed and uncompressed states. 2. The connector of claim 1 wherein the second internal volume is greater than the first internal volume. 3. The connector of claim 1 wherein the second internal volume is substantially equal to the first internal volume. 4. The connector of claim 1 wherein the flex-tube insert has a first maximum width when uncollapsed and a second maximum width, greater than the first maximum width, when collapsed, the width defined by the maximum cross section of the flex-tube insert when viewed along the axis of the fluid path. 5. The connector of claim 1 wherein the flex-tube insert comprises one collapsible section and the first end is secured within the piston head and the second end is secured within the piston base. 6. The connector of claim 1 wherein, when viewed along the axis of the fluid path, the flex-tube assembly has a first maximum cross-sectional area when uncollapsed and a second maximum cross-sectional area, greater than the first maximum cross-sectional area, when collapsed. 7. The connector of claim 1 wherein the flex-tube assembly comprises one collapsible section and the first end comprises the piston head and the second end comprises the piston base. 8. The connector of claim 1 wherein the flex-tube assembly comprises: two collapsible sections; and a middle support for joining the two collapsible section; wherein for one collapsible section, the first end comprises the piston head and the second end is pivotably attached to the middle support, and wherein for the other collapsible section, the first end is pivotable attached to the middle support and the second end comprises the piston base. 9. The connector of claim 1 wherein each collapsible section comprises: a first end; a second end; and a plurality of hinge assemblies each having a hinge and two plates including two substantially parallel edges, one of the edges attached to the hinge for pivotal movement and the other of the edges attached to one of either the first or second ends for pivotal movement. 10. The connector of claim 9 wherein there are four hinge assemblies arranged so that the flex-tube insert has a substantially square cross section when viewed along the axis of the fluid path. 11. The connector of claim 1 wherein the flex-tube insert comprises: two collapsible sections; and a middle support for joining the two collapsible sections; wherein for one collapsible section, the first end is secured within the piston head and the second end is pivotably attached to the middle support, and wherein for the other collapsible section, the first end is pivotably attached to the middle support and the second end is secured within the piston base. 12. The connector of claim 11 wherein each collapsible section comprises: a first end; a second end; a plurality of hinge assemblies each having a hinge and two plates including two substantially parallel edges, one of the edges attached to the hinge for pivotal movement and the other of the edges attached to one of either the first or second ends for pivotal movement; and a plurality of resiliently deformable webs joining the edges of adjacent hinge assemblies to enclose the fluid path. 13. The connector of claim 12 wherein the hinge assemblies and the webs are formed of the same material and the webs are thinner than the hinge assemblies. 14. The connector of claim 1 wherein the housing comprises: a valve body with a first set of geometrically-shaped snap-fit devices defined by a first set of dimensions; and a male Luer-lock insert with a second set of geometrically-shaped snap-fit devices also defined by the first set of dimensions but complementary to the first set of devices; wherein the first and second set of snap-fit devices are aligned to provide snap-fit assembly of the valve body and male Luer-lock insert. 15. The connector of claim 14 wherein the first set of devices are recesses and the second set of devices are protrusions. 16. A valve for providing a fluid path between the inlet portion and outlet port of a connector, said valve comprising; a flex-tube insert substantially axially aligned with the axis of the fluid path, the insert movable between uncompressed and compressed states, the insert having a first maximum inner width while uncompressed and a second maximum inner width, greater than the first maximum inner width, while compressed; and a flex-tube piston surrounding the flex-tube insert defining the radial boundaries of the fluid path, the flex-tube piston including a piston head for positioning within the inlet port during the uncompressed state and outside the inlet port during the compressed state, a bore carried by the piston head, the bore closed when the piston head is within the inlet port and opened when the piston head is outside the inlet port, and a piston base for positioning proximal the outlet port and providing fluid communication with the outlet port, the flex-tube piston responsive to movement of the flex-tube insert; wherein the flex-tube insert is formed of a substantially rigid material and the flex-tube piston is formed of a resiliently deformable material such that the outer circumference of the flex-tube insert remains in close contact with the inner circumference of the flex-tube piston over the length of the flex-tube insert in the compressed and uncompressed states. 17. The valve of claim 16 wherein the flex-tube insert comprises at least one collapsible section having a maximum cross section when viewed along the axis of the fluid path, the maximum cross section defining the first and second maximum inner widths. 18. The connector of claim 17 wherein the flex-tube insert comprises: two collapsible sections; and a middle support having a bore therethrough axially aligned with the fluid path, the middle support for joining the two collapsible sections; wherein for one collapsible section, the first end is secured within the piston head and the second end is pivotably attached to the middle support, and wherein for the other collapsible section, the first end is pivotably attached to the middle support and the second end is secured within the piston base. 19. The connector of claim 17 wherein the flex-tube insert comprises one collapsible section and the first end is secured within the piston head and the second end is secured within the piston base. 20. The connector of claim 17 wherein each collapsible section comprises: a first end; a second end; and a plurality of hinge assemblies each having a hinge and two plates including two substantially parallel edges, one of the edges attached to the hinge for pivotal movement and the other of the edges attached to one of either the first or second ends for pivotal movement. 21. The valve of claim 20 wherein there are four hinge assemblies arranged so that the flex-tube insert has a substantially square cross section when viewed along the axis of the fluid path and the distance between opposing hinges of the hinge assemblies define the first and second maximum cross sections. 22. A needleless connector for medical use, adapted to facilitate the flow of fluid therethrough, said connector comprising: a housing having an inlet port and an outlet port; and a flex-tube assembly defining a fluid path between the inlet port and the outlet port, the flex-tube assembly movable between uncompressed and compressed states, the flex-tube assembly having a first internal volume when in the uncompressed state and a second internal volume, at least as great as the first internal volume, when in the compressed state; wherein the flex-tube assembly comprises: a flex-tube insert having at least one collapsible section movable between uncollapsed and collapsed states; a flex-tube piston surrounding the flex-tube insert and defining the fluid path, the flex-tube piston including a piston head positioned within the inlet port during the uncompressed state and outside the inlet port during the compressed state, a bore carried by the piston head, the bore closed when the piston head is within the inlet port and opened when the piston head is outside the inlet port, and a piston base proximal the outlet port and in communication therewith, the flex-tube piston responsive to the movement of the flex-tube insert, the flex-tube insert being formed of a substantially rigid material and the flex-tube piston being formed of a resiliently deformable material such that the outer circumference of the flex-tube insert remains in close contact with the inner circumference of the flex-tube piston over the length of the flex-tube insert in the compressed and uncompressed states. 23. The connector of claim 22 wherein each collapsible section comprises: a first end; a second end; and a plurality of hinge assemblies each having a hinge and two plates including two substantially parallel edges, one of the edges attached to the hinge for pivotal movement and the other of the edges attached to one of either the first or second ends for pivotal movement. 24. The connector of claim 22 wherein the flex-tube insert comprises one collapsible section and the first end is secured within the piston head and the second end is secured within the piston base. 25. The connector of claim 22 wherein the flex-tube insert comprises: two collapsible sections; and a middle support for joining the two collapsible sections; wherein for one collapsible section, the first end is secured within the piston head and the second end is pivotably attached to the middle support, and wherein for the other collapsible section, the first end is pivotably attached to the middle support and the second end is secured within the piston base. 26. The connector of claim 22 wherein there are four hinge assemblies arranged so that the flex-tube insert has a substantially square cross section when viewed along the axis of the fluid path. 27. The connector of claim 22 wherein, when viewed along the axis of the fluid path, the flex-tube assembly has a first maximum cross-sectional area when uncollapsed and a second maximum cross-sectional area, greater than the first maximum cross-sectional area, when collapsed. 28. The connector of claim 22 wherein the flex-tube assembly comprises one collapsible section and the first end comprises the piston head and the second end comprises the piston base. 29. The connector of claim 22 wherein the flex-tube assembly comprises: two collapsible sections; and a middle support for joining the two collapsible section; wherein for one collapsible section, the first end comprises the piston head and the second end is pivotably attached to the middle support, and wherein for the other collapsible section, the first end is pivotable attached to the middle support and the second end comprises the piston base. 30. The connector of claim 22 wherein the housing comprises: a valve body with a first set of geometrically-shaped snap-fit devices defined by a first set of dimensions; and a male Luer-lock insert with a second set of geometrically-shaped snap-fit devices also defined by the first set of dimensions but complementary to the first set of devices; wherein the first and second set of snap-fit devices are aligned to provide snap-fit assembly of the valve body and male Luer-lock insert. 31. The connector of claim 22 wherein each collapsible section comprises: a first end; a second end; a plurality of hinge assemblies each having a hinge and two plates including two substantially parallel edges, one of the edges attached to the hinge for pivotal movement and the other of the edges attached to one of either the first or second ends for pivotal movement; and a plurality of resiliently deformable webs joining the edges of adjacent hinge assemblies to enclose the fluid path. 32. The connector of claim 31 wherein the hinge assemblies and the webs are formed of the same material and the webs are thinner than the hinge assemblies.