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An anti-free-flow mechanism includes an occluder mechanism which is disposed along a segment of tubing. The occluder mechanism is normally in a biased closed position, but may be moved into an open position by moving an engagement member into engagement with the tubing segment to deform the tubing s

An anti-free-flow mechanism includes an occluder mechanism which is disposed along a segment of tubing. The occluder mechanism is normally in a biased closed position, but may be moved into an open position by moving an engagement member into engagement with the tubing segment to deform the tubing segment and open a flow channel. Unless force is applied to keep the engagement member in contact with the tubing segment, the tubing will return to the first, closed position.

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1. A cassette for mounting on a peristaltic pump housing, the cassette comprising: a cassette body having at least one connector, the at least one connector including an occluder;a flexible pump tube attached to the at least one connector; andan angled engagement surface disposed on the cassette bod

1. A cassette for mounting on a peristaltic pump housing, the cassette comprising: a cassette body having at least one connector, the at least one connector including an occluder;a flexible pump tube attached to the at least one connector; andan angled engagement surface disposed on the cassette body at least partially disposed on a projection extending from the body and being disposed at an angle relative to the body, the angled engagement surface engaging the peristaltic pump housing such that the cassette body is removably mountable on the peristaltic pump housing;wherein the angled engagement surface interacts with a complimentary surface of the peristaltic pump housing such that under tension from partial engagement of the complimentary surface, the cassette body is biased into a mounted position;wherein the engagement surface comprises a first sloped section and a second sloped section;wherein the second sloped section is disposed at substantially the same angle as the first sloped section and is disposed further away from the body than the first sloped section;wherein the occluder is disposed in a portion of the flexible pump tube to selectively prevent flow therethrough. 2. The cassette of claim 1, wherein the engagement surface comprises a third sloped section between the first sloped section and the second sloped section, the third sloped section being at a different angle than the first sloped section or the second sloped section. 3. The cassette of claim 1, wherein the engagement surface has at least a portion thereof disposed at an angle of about 3 to about 15 degrees relative to the body member. 4. The cassette of claim 1, wherein the engagement surface is disposed at an angle of about 10 degrees or less relative to the body. 5. The cassette of claim 1, wherein the engagement surface comprises a third surface portion generally perpendicular to the first sloped section and the second sloped section. 6. The cassette of claim 5, wherein the first and second sloped sections are disposed at an angle of about 15 degrees or less relative to the body member. 7. The cassette of claim 1, wherein the engagement surface is disposed on the same side of the body as the tube, and wherein loading the cassette in a pump places the tube in tension and biases the engagement surfaces into contact with a mounting structure on a pump. 8. A cassette for a fluid delivery set, the cassette comprising: a tubing segment;an occluder disposed in a portion of the tubing segment to selectively prevent flow therethrough;a cassette body connected to the tubing segment, the cassette body having a projection extending therefrom, at least a portion of the projection being disposed adjacent the portion of the tubing containing the connector occluder, the projection being movable between a first position wherein the projection does not forcefully engage the tubing to distend the tubing adjacent the occluder to thereby open a flow channel between the portion of the tubing and the occluder and a second position wherein at least a portion of the projection forcefully engages the tubing and distends the tubing to open at least one flow path between the tubing and the occluder;wherein the cassette body is configured to be removably mountable to a peristaltic pump housing. 9. The cassette of claim 8, wherein the cassette body includes a connector and wherein the occluder is attached to and spaced apart from the connector to form a fluid flow port. 10. The cassette of claim 8, wherein the projection has an engagement member disposed along the projection for engaging the portion of the tubing section. 11. The cassette of claim 10, wherein the engagement member includes a plurality of rounded projections for engaging the portion of the tubing segment. 12. The cassette of claim 11 wherein the occluder has a radius and wherein engagement member includes a recess between the projections, at least a portion of the recess having a radius which is the same or smaller than the radius of the occluder. 13. A device for selectively preventing flow through an infusion set, the device comprising: an occluder having at least one body, the at least one body forming a stop for disposition in a tubing segment to selectively prevent flow therethrough and the at least one body forming an actuator, the actuator being deflectable to forcefully engage the tubing segment to open a flow channel past the occluder, the actuator extending from the body to a position adjacent the stop;wherein the device is configured to be removably mountable to a peristaltic pump housing;wherein the actuator comprises an engagement member for engaging and deforming the tubing segment. 14. A fluid delivery set comprising the device of claim 13, the fluid delivery set comprising a tubing segment, the stop being disposed in the tubing segment and the actuator extending along the occluder segment. 15. The fluid delivery set according to claim 14, wherein the at least one body comprises a first body comprising the stop and a second body comprising the actuator. 16. The fluid delivery set according to claim 15, wherein the first body is attached to the second body by at least one of the group consisting of press-fit, snap fit, bonding or adhesive. 17. The fluid delivery set according to claim 14, wherein the body comprises at least one projection having an angled face configured for engaging a recess on a peristaltic pump. 18. A fluid delivery system including the fluid delivery set of claim 17, wherein the pump comprises a recess having an angled surface for complementary receipt of the angled face of the projection of the body. 19. The fluid delivery system of claim 18, wherein the projection has an angled face disposed at 0 to 15 degrees from vertical and wherein the recess has an angled engagement surface which is disposed at 0 to 15 degrees in the opposite direction. 20. A fluid delivery cassette comprising: a cassette body having a first connector and a second connector, at least one of the connectors having an occluder attached thereto;a tubing segment attached to the first connector and the second connector, the occluder being disposed in the tubing segment; andan actuator extending from the cassette body to a position on the outside of the tubing segment adjacent the occluder, the actuator being deflectable to forcefully engage the tubing segment with the occluder to open a flow channel past the occluder;wherein the cassette body is configured to be removably mountable to a peristaltic pump housing. 21. A fluid delivery cassette of claim 20, wherein the actuator comprises a bendable arm. 22. The fluid delivery cassette of claim 21, further comprising an engagement member disposed on the bendable arm for engaging and deforming the tubing segment.