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An apparatus (10) for use with an inflow cannula (12) of a ventricular assist device (VAD) (14). The cannula (12) has a first part (30) for connecting with a ventricle (22) of a heart (24) and a second part (32) for connecting with the VAD (14). The apparatus (10) comprises a flexible conduit (60) h

An apparatus (10) for use with an inflow cannula (12) of a ventricular assist device (VAD) (14). The cannula (12) has a first part (30) for connecting with a ventricle (22) of a heart (24) and a second part (32) for connecting with the VAD (14). The apparatus (10) comprises a flexible conduit (60) having oppositely disposed first and second ends (70and72) and a main body portion (68) intermediate the ends. The main body portion (68) is movable between a radially collapsed closed condition in which blood flow through the conduit (60) is blocked and a radially expanded open condition in which blood flow through the conduit is unrestricted. A first connector (64) connects the first end (70) of the conduit (60) to the first part (30) of the inflow cannula (12). A second connector (62and66) connects the second end (72) of the conduit (60) to the second part (32) of the inflow cannula (12). Several designs are disclosed for securing the connectors (64, 62, and66) together to prevent relative movement of the ends (70, 72) away from each other.

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1. An apparatus for use with an inflow cannula of a ventricular assist device (VAD), the inflow cannula having a first part for connecting with a ventricle of a heart and a second part for connecting with the VAD, said apparatus comprising: a conduit made of a flexible material, said conduit having

1. An apparatus for use with an inflow cannula of a ventricular assist device (VAD), the inflow cannula having a first part for connecting with a ventricle of a heart and a second part for connecting with the VAD, said apparatus comprising: a conduit made of a flexible material, said conduit having oppositely disposed first and second ends and a main body portion intermediate said ends, said main body portion of said conduit being movable between a radially collapsed closed condition in which blood flow through said conduit is blocked and a radially expanded open condition in which blood flow through said conduit is not blocked; first connecting means for connecting said first end of said conduit to the first part of the inflow cannula; and second connecting means for connecting said second end of said conduit to the second part of the inflow cannula; said first connecting means comprises a first nut for threadedly engaging threads on the first part on the inflow cannula; said second connecting means comprises a second nut and a threaded adapter, said adapter having a first threaded portion for engaging threads on the second part of the inflow cannula and a second threaded portion for threadedly engaging said second nut. 2. The apparatus of claim 1 wherein said main body portion of said conduit has an accordion-like configuration to allow for relative axial and radial movement of said ends. 3. The apparatus of claim 1 wherein said first end of said conduit is sandwiched between threads on said first nut and the threads on the first part of the inflow cannula. 4. The apparatus of claim 1 wherein said second end of said conduit is sandwiched between threads on said second nut and said second threaded portion on said adapter. 5. The apparatus of claim 1 further comprising means for occluding blood flow through said conduit. 6. The apparatus of claim 5 wherein said means for occluding blood flow comprises a surgical clamp. 7. The apparatus of claim 5 wherein said means for occluding blood flow comprises a threaded plug connected to said second connecting means. 8. The apparatus of claim 1 further comprising means for preventing relative axial and radial movement of said ends of said conduit away from each other. 9. The apparatus of claim 8 wherein said means for preventing movement of said ends comprises at least one suture that extends between said first and second connecting means and secure said first and second connecting means to each other. 10. The apparatus of claim 8 wherein said means for preventing movement of said ends comprises a collar that connects said first and second connecting means to each other, the collar having pin members that are sized and located to engage slots on the first nut. 11. The apparatus of claim 1 wherein said first connecting means comprises an adhesive for bonding said first end of said conduit to the first part on the inflow cannula. 12. The apparatus of claim 11 wherein said second connecting means comprises a rotating seal disposed at said second end of said conduit, said rotating seal for sealingly engaging the second part of the inflow cannula and allowing rotation of the second part relative to said rotating seal. 13. An apparatus for use with an inflow cannula of a ventricular assist device (VAD), the inflow cannula having a first part for connecting with a ventricle of a heart and a second cart for connecting with the VAD, said apparatus comprising: a conduit made of a flexible material, said conduit having oppositely disposed first and second ends and a main body portion intermediate said ends, said main body portion of said conduit being movable between a radially collapsed closed condition in which blood flow through said conduit is blocked and a radially expanded open condition in which blood flow through said conduit is not blocked; first connecting means for connecting said first end of said conduit to the first cart of the inflow cannula; and second connecting means for c onnecting said second end of said conduit to the second part of the inflow cannula; means for preventing relative axial and radial movement of said ends of said conduit away from each other comprising a hinged clamshell-style sleeve that encloses said first and second connecting means and holds said main body portion of said conduit in an axially compressed condition. 14. An apparatus for use with an inflow cannula of a ventricular assist device (VAD), the inflow cannula having a first part for connecting with a ventricle of a heart and a second part for connecting with the VAD, said apparatus comprising: a conduit made of a flexible material, said conduit having oppositely disposed first and second ends and a main body portion intermediate said ends, said main body portion of said conduit being movable between a radially collapsed closed condition in which blood flow through said conduit is blocked and a radially expanded open condition in which blood flow through said conduit is not blocked; first connecting means for connecting said first end of said conduit to the first cart of the inflow cannula; and second connecting means for connecting said second end of said conduit to the second part of the inflow cannula; means for preventing relative axial and radial movement of said ends of said conduit away from each other comprising a fabric sheath that encloses said first and second connecting means and holds said main body portion of said conduit in an axially compressed condition. 15. An apparatus for use with an inflow cannula of a ventricular assist device (VAD), the inflow cannula having a first part for connecting with a ventricle of a heart and a second part for connecting with the VAD, said apparatus comprising: a conduit having oppositely disposed first and second ends and a main body portion intermediate said ends, said main body portion having a resiliently flexible section that is compressible to a closed condition in which blood flow through said conduit is blocked; first connecting means for connecting said first end of said conduit to the first part of the inflow cannula; and second connecting means for connecting said second end of said conduit to the second part of the inflow cannula; said first connecting means comprises a first nut for threadedly engaging threads on the first part on the inflow cannula; said second connecting means comprises a second nut and a threaded adapter, said adapter having a first threaded portion for threadedly engaging threads on the second part of the inflow cannula and a second threaded portion for threadedly engaging said second nut. 16. The apparatus of claim 15 wherein said first end of said conduit is sandwiched between threads on said first nut and the threads on the first part of the inflow cannula. 17. The apparatus of claim 15 wherein said second end of said conduit is sandwiched between threads on said second nut and threads on said adapter. 18. The apparatus of claim 15 wherein said first connecting means comprises an adhesive for bonding said first end of said conduit to the first part on the inflow cannula. 19. The apparatus of claim 18 wherein said second connecting means comprises a rotating seal disposed at said second end of said conduit, said rotating seal for sealingly engaging the second part of the inflow cannula and allowing rotation of the second part relative to said rotating seal. 20. The apparatus of claim 15 further comprising means for occluding blood flow through said conduit. 21. An apparatus for use with an inflow cannula for directing blood flow from a heart to a ventricular assist device (VAD), the inflow cannula having a first part for connecting with a ventricle of the heart and a second part for connecting with the VAD, said apparatus comprising: a conduit made of a flexible material, said conduit having oppositely disposed threaded first and second ends and a main body portion intermediate said ends, said main body portion being movabl e between a radially collapsed closed condition in which blood flow through said conduit is blocked and a radially expanded open condition in which blood flow through said conduit is not blocked; a first nut circumferentially disposed about said first end of said conduit for connecting said first end to the first part of the inflow cannula; a threaded adapter for connecting to the second part of the inflow cannula; and a second nut circumferentially disposed about said second end of said conduit and connecting said second end to said adapter. 22. The apparatus of claim 21 wherein said main body portion has an accordion-like configuration to allow for relative axial and radial movement of said ends. 23. The apparatus of claim 21 which said adapter has first and second threaded portions, said first threaded portion for threadedly engaging the second part of the inflow cannula, said second threaded portion threadedly engaging said second nut. 24. The apparatus of claim 23 wherein said first end of said conduit is sandwiched between threads on said first nut and threads on the first part of the inflow cannula. 25. The apparatus of claim 23 wherein said second end of said conduit is sandwiched between threads on said second nut and said second threaded portion of said adapter. 26. The apparatus of claim 21 further comprising means for occluding blood flow through said conduit. 27. The apparatus of claim 26 wherein said means for occluding blood flow comprises a surgical clamp. 28. The apparatus of claim 26 wherein said means for occluding blood flow comprises a threaded plug that is connected to said second nut. 29. The apparatus of claim 21 further comprising means for preventing relative axial and radial movement of said ends of said conduit away from each other. 30. An apparatus for use with an inflow cannula for directing blood flow from a heart to a ventricular assist device (VAD), the inflow cannula having a first threaded part for connecting with a ventricle of the heart and a second threaded part for connecting with the VAD, said apparatus comprising: a conduit having oppositely disposed threaded first and second ends and a main body portion intermediate said ends, said main body portion having a resiliently flexible section that is compressible to a closed condition in which blood flow through said conduit is blocked; a first nut circumferentially disposed about said first end of said conduit for connecting said first end to the first threaded part of the inflow cannula; a threaded adapter for connecting to the second threaded part of the inflow cannula; and a second nut circumferentially disposed about said second end of said conduit and connecting said second end to said adapter. 31. The apparatus of claim 30 wherein said first end of said conduit is sandwiched between threads on said first nut and threads on the first threaded part of the inflow cannula. 32. The apparatus of claim 30 wherein said second end of said conduit is sandwiched between threads on said second nut and threads on said adapter. 33. The apparatus of claim 32 further comprising means for preventing relative axial and radial movement of said ends of said conduit away from each other. 34. An apparatus for use with an inflow cannula of a ventricular assist device (VAD), the inflow cannula having a first part for connecting with a ventricle of a heart and a second part for connecting with the VAD, said apparatus comprising: a conduit made of a flexible material, said conduit having oppositely disposed first and second ends and a main body portion intermediate said ends, said main body portion having an accordion-like configuration to allow for relative axial and radial movement of said ends; first connecting means for connecting said first end of said conduit to the first part of the inflow cannula; second connecting means for connecting said second end of said conduit to the second part of the inflow cannula; and means for occluding blood flo w through said main body portion of said conduit; said first connecting means comprises a first nut for threadedly engaging threads on the first part on the inflow cannula; said second connecting means comprises a second nut and a threaded adapter, said adapter having a first threaded portion for threadedly engaging threads on the second part of the inflow cannula and a second threaded portion for threadedly engaging said second nut. 35. The apparatus of claim 34 wherein said means for occluding blood flow comprises a surgical clamp. 36. The apparatus of claim 34 wherein said means for occluding blood flow comprises a threaded plug that is connected to said second connecting means. 37. The apparatus of claim 34 further comprising means for preventing relative axial and radial movement of said ends of said conduit away from each other. 38. An apparatus for use with an inflow cannula for directing blood flow from a heart to a ventricular assist device (VAD), the inflow cannula having a first part for connecting with a ventricle of a heart and a second part for connecting with the VAD, said apparatus comprising: a conduit made of a flexible material, said conduit having oppositely disposed first and second ends and a main body portion intermediate said ends, said main body portion having an accordion-like configuration to allow for relative axial and radial movement of said ends; a first nut circumferentially disposed about said first end of said conduit for connecting said first end to the first part of the inflow cannula; an adapter for connecting to the second part of the inflow cannula; a second nut circumferentially disposed about said second end of said conduit and connecting said second end to said adapter; and means for occluding blood flow through said main body portion of said conduit. 39. The apparatus of claim 38 wherein said means for occluding blood flow comprises a surgical clamp. 40. The apparatus of claim 38 wherein said means for occluding blood flow comprises a threaded plug that is connected to said second connecting means. 41. The apparatus of claim 38 further comprising means for preventing relative axial and radial movement of said ends of said conduit away from each other. 42. The apparatus of claim 38 which said adapter has first and second threaded portions, said first threaded portion for threadedly engaging the second part of the inflow cannula, said second threaded portion threadedly engaging said second nut. 43. The apparatus of claim 42 wherein said first end of said conduit is sandwiched between threads on said first nut and the threads on the first part of the inflow cannula. 44. The apparatus of claim 43 wherein said second end of said conduit is sandwiched between threads on said second nut and said second threaded portion of said adapter. 45. An apparatus for use with a ventricular assist device (VAD), said apparatus comprising: an inflow cannula having a first part for connecting with a ventricle of a heart and a second part for connecting with the VAD; a conduit made of a flexible material, said conduit having oppositely disposed first and second ends and a main body portion intermediate said ends, said main body portion having an accordion-like configuration to allow for relative axial and radial movement of said ends; first connecting means for connecting said first end of said conduit to said first part of said inflow cannula; second connecting means for connecting said second end of said conduit to said second part of said inflow cannula; and means for occluding blood flow through said inflow cannula; said first connecting means comprises a first nut for threadedly engaging threads on the first part on the inflow cannula; said second connecting means comprises a second nut and a threaded adapter, said adapter having a first threaded portion for threadedly engaging threads on said second cart of said inflow cannula and a second threaded portion for threadedly engaging said se cond nut. 46. The apparatus of claim 45 wherein said means for occluding blood flow comprises a surgical clamp. 47. The apparatus of claim 45 wherein said means for occluding blood flow comprises a threaded plug that is connected to said second connecting means. 48. The apparatus of claim 45 further comprising means for preventing relative axial and radial movement of said ends of said conduit away from each other. 49. The apparatus of claim 45 wherein said first connecting means comprises an adhesive for bonding said first end of said conduit to the first part on the inflow cannula. 50. The apparatus of claim 49 wherein said second connecting means comprises a rotating seal disposed at said second end of said conduit, said rotating seal for sealingly engaging the second part of the inflow cannula and allowing rotation of the second part relative to said rotating seal. 51. An apparatus for use with a ventricular assist device (VAD), said apparatus comprising: an inflow cannula having a first part for connecting with a ventricle of a heart and a second part for connecting with the VAD; a conduit made of a flexible material, said conduit having oppositely disposed first and second ends and a main body portion intermediate said ends, said main body portion having an accordion-like configuration to allow for relative axial and radial movement of said ends; first connecting means for connecting said first end of said conduit to said first part of said inflow cannula; second connecting means for connecting said second end of said conduit to said second part of said inflow cannula; and means for occluding blood flow through said inflow cannula comprising an inflatable balloon. 52. The apparatus of claim 51 wherein said first part of said inflow cannula includes an opening and a removable screw positionable in said opening, said balloon being insertable into said inflow cannula through said opening when said screw is removed.