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A system for selectively preventing free flow in a tube includes an in-line occluder disposed in the tube and an actuator pad for creating a flow path between the tube and the occluder. The actuation pad presses towards the occluder from a single side and stretches the tube to create a large flow pa

A system for selectively preventing free flow in a tube includes an in-line occluder disposed in the tube and an actuator pad for creating a flow path between the tube and the occluder. The actuation pad presses towards the occluder from a single side and stretches the tube to create a large flow path. The occluder stem is strengthened to resist deformation and damage from the forces applied by the actuator pad.

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1. An in-line occluder comprising: a flexible tubing having a bore;an occluder disposed in the bore, the occluder comprising: a body;an occluding portion, the occluding portion having a round cross-section and engaging the bore of the tubing to seal against the tubing and prevent flow past the tubin

1. An in-line occluder comprising: a flexible tubing having a bore;an occluder disposed in the bore, the occluder comprising: a body;an occluding portion, the occluding portion having a round cross-section and engaging the bore of the tubing to seal against the tubing and prevent flow past the tubing; anda stem connecting the body to the occluding portion, the stem having a ‘T’ shaped cross section. 2. The occluder of claim 1, wherein the stem comprises a side wall disposed along a side of the stem and a center web attached to the middle of the side wall and extending perpendicular thereto towards an opposite side of the stem. 3. The occluder of claim 2, wherein the body comprises a longitudinal bore extending along the length thereof and a lateral bore extending laterally through an end of the body adjacent the stem. 4. The occluder of claim 3, wherein the lateral bore extends generally perpendicular to the center web. 5. The occluder of claim 3, wherein fluid flows between the occluding portion and the tubing, around the center web, and through the body. 6. A system comprising the occluder of claim 2, and further comprising an actuator pad disposed adjacent the occluder, and wherein the actuator pad presses inwardly on an outer surface of the tubing on one side of the tubing to open a flow passage between the occluding portion and an opposite side of the tubing. 7. The system of claim 6, wherein the actuator pad comprises two projections having curved ends and an actuation channel disposed between the two projections, and wherein the actuator pad engages the tubing between the two projections and presses the tubing and the occluding portion towards the actuation channel. 8. The system of claim 7, wherein the actuation channel tapers such that a bottom of the channel is narrower than a top of the channel. 9. The system of claim 7, wherein the two projections have a radius of curvature approximately equal to the radius of the occluding portion, and wherein the actuation channel has a width approximately equal to the diameter of the occluding portion. 10. The system of claim 6, wherein the actuator pad is connected to the occluder. 11. The system of claim 6, further comprising a pump having a pump door, wherein the occluder and actuator pad are mounted in the pump, and wherein the pump door engages the actuator pad to press the actuator pad against the tubing to open a flow channel past the occluding portion of the occluder. 12. The system of claim 11, wherein a projection on the pump door moves in a first direction when the door is closed and wherein the projection engages the actuator pad and presses the actuator pad in a second direction perpendicular to the first direction to thereby press the actuator pad against the tubing. 13. An occluder system comprising: a flexible tubing having a lumen;an occluder comprising: a body;a stem having a first end and a second end, the first end being attached to the body; andan occluding portion attached to the second end of the stem and spaced apart from the body, the occluding portion being disposed in the lumen of the tube and having a round cross-section with a diameter greater than the diameter of the lumen;an actuator pad, the actuator pad comprising: two projections; andan actuation channel disposed between the two projections; andwherein the actuation pad selectively engages the tubing on one side of the tubing to create a flow passage between the occluding portion and an opposite side of the tubing. 14. The system of claim 13, wherein the two projections have curved ends. 15. The system of claim 14, wherein the two projections each have a radius of curvature which is approximately equal to the radius of the occluding portion. 16. The system of claim 13, wherein the actuation channel has a width approximately equal to the diameter of the occluding portion. 17. The system of claim 13, wherein the actuation channel tapers such that a top of the actuation channel is wider than a bottom of the actuation channel. 18. The system of claim 13, wherein a top portion of the actuation channel transitions into the curved ends such that the curved ends curve away from the actuation channel. 19. The system of claim 13, wherein the actuation channel has a rounded bottom. 20. The system of claim 13, wherein the actuator pad is movable towards the occluding portion to engage the tube and open a flow channel between the occluding portion and the tube. 21. The system of claim 13, wherein the actuator pad is attached to the occluder and is pivotable towards the occluding portion. 22. The system of claim 13, wherein the actuator pad further comprises a recessed tip portion adjacent the projections, and wherein the tip portion contacts the tube to displace the tube laterally when the actuator pad engages the tube to open a flow passage. 23. The system of claim 13, wherein the actuation channel is tapered so as to be narrower at the bottom. 24. The system of claim 23, wherein the actuation channel tapers between 5 and 20 degrees.