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A needleless connector has a body having an internal cavity with a sealing ridge, a port, an output flow channel, and a fluid flow path between the port and output flow channel. The connector also has a collapsible valve disposed within the cavity. The valve includes a cylindrical wall having a cent

A needleless connector has a body having an internal cavity with a sealing ridge, a port, an output flow channel, and a fluid flow path between the port and output flow channel. The connector also has a collapsible valve disposed within the cavity. The valve includes a cylindrical wall having a center axis, an internal surface, and a shoulder configured to sealingly contact the ridge of the body, thereby blocking the fluid flow path. The valve also includes a head fixedly attached to the wall. The head has a smiley cut at a first angular position about the center axis and a continuous top surface that is generally perpendicular to the axis. The valve also includes a first dimple formed in the internal surface of the cylindrical wall. The dimple extends around the internal surface over an angle in the range of 90-270°.

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1. A needleless connector comprising: a body having an internal cavity; anda collapsible valve disposed within the internal cavity, the valve, when unrestrained, comprising: a cylindrical wall having a center axis, an internal surface, an external surface, and a first concave cut-out on the internal

1. A needleless connector comprising: a body having an internal cavity; anda collapsible valve disposed within the internal cavity, the valve, when unrestrained, comprising: a cylindrical wall having a center axis, an internal surface, an external surface, and a first concave cut-out on the internal surface extending away the center axis, wherein the first concave cut-out extends around the internal surface over an angle in the range of only 90-270 degrees, and a protruding portion of the external surface of the cylindrical wall aligned with the first concave cut-out protrudes radially away from the center axis, and wherein the external surface adjacent the protruding portion does not extend toward the center axis; anda head fixedly attached to the cylindrical wall, the head having a second concave cut-out extending toward the center axis. 2. The needleless connector of claim 1, wherein the body comprises a first port, a second port opposite the first port, a flow channel between the first and second port; and the external surface of the cylindrical wall comprises a shoulder configured to sealingly contact an internal surface of the body, thereby blocking the flow channel. 3. The needleless connector of claim 1, wherein the head comprises a continuous top surface that is generally perpendicular to the axis. 4. The needleless connector of claim 1, wherein the first concave cut-out extends around the internal surface of the cylindrical wall in a plane that is perpendicular to the center axis. 5. The needleless connector of claim 1, further comprising a third concave cut-out formed on the internal surface of the cylindrical wall and extending around the internal surface over an angle in the range of 90-270 degrees, the third concave cut-out being axially offset from the first concave cut-out. 6. The needleless connector of claim 5, wherein the third concave cut-out is angularly offset about the center axis from the first concave cut-out by an angle of approximately 180 degrees. 7. The needleless connector of claim 5, wherein the first concave cut-out or the third concave cut-out is angularly offset about the center axis from the second concave cut-out angle in the range of 90-270 degrees. 8. The needleless connector of claim 1, wherein the first concave cut-out is angularly offset about the center axis from the second concave cut-out by an angle of approximately 180 degrees. 9. The needleless connector of claim 1, wherein (i) the collapsible valve comprises an internal air space formed within the cylindrical wall, the air space having a bottom opening; and (ii) the body comprises air passages that provide an air flow path between the air space of the collapsible valve and the ambient environment. 10. A collapsible valve comprising: a cylindrical wall having a center axis, an internal surface, an external surface, and a first concave cut-out on the internal surface extending away the center axis, wherein a protruding portion of the external surface of the cylindrical wall aligned with the first concave cut-out protruding radially away from the center axis when the valve is unrestrained; anda head fixedly attached to the cylindrical wall, the head having a second concave cutout extending toward the center axis, wherein the second concave cut-out is angularly offset about the center axis relative to the first concave cut-out;wherein the first concave cut-out extends around the internal surface of the cylindrical wall over an angle in the range of 90-270 degrees. 11. The needleless connector of claim 10, wherein the head comprises a continuous top surface that is generally perpendicular to the axis. 12. The needleless connector of claim 10, wherein the first concave cut-out extends around the internal surface of the cylindrical wall in a plane that is perpendicular to the center axis. 13. The needleless connector of claim 10, further comprising a third concave cut-out formed on the internal surface of the cylindrical wall and extending around the internal surface over an angle in the range of 90-270 degrees, the third concave cut-out being axially offset from the first concave cut-out. 14. The needleless connector of claim 13, wherein the third concave cut-out is angularly offset about the center axis from the first concave cut-out by an angle of approximately 180 degrees. 15. The needleless connector of claim 13, wherein the first concave cut-out or the third concave cut-out is angularly offset about the center axis from the second concave cut-out angle in the range of 90-270 degrees. 16. The needleless connector of claim 10, wherein the first and second concave cut-outs are angularly offset by an angle of approximately 180 degrees.