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A medical delivery system for delivering or retrieving a medical implant. In one embodiment, the medical delivery system includes a tube having a lumen; an implant; and a suture releasably joined to the implant, the suture comprising a first end, a second end, and a releasable knot, wherein tension

A medical delivery system for delivering or retrieving a medical implant. In one embodiment, the medical delivery system includes a tube having a lumen; an implant; and a suture releasably joined to the implant, the suture comprising a first end, a second end, and a releasable knot, wherein tension applied to the first end of the suture collapses at least a portion of the implant for introduction into the tubular lumen and tension applied to the second end of the suture releases the implant.

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What is claimed is: 1. A device for delivering a medical implant, comprising: a tube comprising a lumen; and a suture capable of being releasably joined to the implant, the suture comprising a first end, a second end, and a releasable knot, wherein applying tension to the first end of the suture co

What is claimed is: 1. A device for delivering a medical implant, comprising: a tube comprising a lumen; and a suture capable of being releasably joined to the implant, the suture comprising a first end, a second end, and a releasable knot, wherein applying tension to the first end of the suture collapses at least a portion of the implant for introduction into the tubular lumen and applying tension to the second end of the suture releases the suture from the implant. 2. The medical delivery device of claim 1, wherein the suture is capable of being attached to a proximal portion of the implant. 3. The medical delivery device of claim 2, wherein the suture is attached to a coil. 4. The medical delivery device of claim 1, wherein the implant comprises a septal occluder. 5. The medical delivery device of claim 1, wherein the releasable knot comprises a slip knot. 6. The medical delivery device of claim 1, wherein the releasable knot comprises a highwayman's hitch knot. 7. The medical delivery device of claim 1, wherein the first end and the second end of the suture are operatively joined to an actuator. 8. The medical delivery device of claim 1, wherein the suture is capable of being joined to the implant at a plurality of attachment sites. 9. The medical delivery device of claim 1 further comprising a grasper. 10. The medical delivery device of claim 9, wherein the grasper comprises a fixed position jaw. 11. The medical delivery device of claim 9, wherein the grasper comprises a pivotal jaw. 12. The medical delivery device of claim 11 further comprising an elongated member wherein the grasper is joined to the elongated member. 13. The medical delivery device of claim 12, wherein said elongated member is operatively joined to an actuator. 14. A medical delivery system for delivering an implant comprising a tube comprising a lumen for slideably receiving the implant; and a suture comprising a first end, a second end, and a knot, wherein the suture is capable of being releasably joined to the implant by the knot, the implant being secured to the suture when tension is applied to the first end of the suture and the implant being released from the suture when tension is applied to the second end of the suture. 15. The medical delivery system of claim 14, wherein said tube is operatively joined to an actuator. 16. The medical delivery system of claim 14, wherein the knot is a slip knot. 17. The medical delivery system of claim 16, wherein tension applied to the first end of the suture tightens the knot and tension applied to the second end of the suture releases the knot. 18. The medical delivery system of claim 17, wherein tension applied to the first end of the suture is capable of collapsing collapses at least a portion of the implant for introduction into the lumen of the tube. 19. The medical delivery system of claim 14, wherein the implant comprises a septal occluder. 20. The medical delivery system of claim 14, further comprising a plurality of sutures. 21. The medical delivery system of claim 20, wherein the tube further comprises at least one separate lumen for slideably receiving at least one of the plurality of sutures. 22. An attachment system for a medical implant, comprising: a suture comprising a first end, a second end, and a knot, wherein the suture is capable of being releasably joined to the implant by the knot, the implant being secured to the suture when tension is applied to the first end of the suture and the implant being released from the suture when tension is applied to the second end of the suture. 23. A method of occluding a site in a body of a patient, the method comprising: providing a medical delivery system for a medical implant, comprising: a tube comprising a lumen; an implant; and a suture releasably joined to the implant, the suture comprising a first end, a second end, and a releasable knot, wherein applying tension to the first end of the suture collapses at least a portion of the implant for introduction into the tube lumen and applying tension to the second end of the suture releases the knot; and delivering the implant to an anatomical site in the body of the patient. 24. The method of claim 23, wherein the site is a vessel. 25. The method claim of claim 24, wherein the site is a patent foramen ovale.