Bone cement delivery assembly with leakage prevention valve

A delivery assembly for delivering material into living tissue, the delivery assembly including:

• an access cannula that includes a tube formed from material capable of being inserted into a living body, said tube having opposed proximal and distal ends, the distal end of the tube configured for insertion into the living body and a lumen that extends through the tube;
• a delivery cannula, said delivery cannula having a tube with opposed proximal and distal ends, said delivery cannula tube dimensioned to seat in the lumen of said access cannula tube and a fitting that leads to the distal end of said deliver cannula tube, said fitting dimensioned to receive a connector in communication with a container in which the material to be delivered into the living tissue is contained;
• and
• a valve attached to said access cannula adjacent the proximal end of said access cannula tube, said valve having at least one element that is normally closed over said access cannula tube to prevent the proximal flow of material out of the tube and that is capable of moving to an open position upon the manual insertion of said delivery cannula tube in the access cannula and a biasing member that, upon removal to the delivery cannula tube from the access cannula, returns the at least one element to the closed position;
• wherein said access cannula includes a handle having a proximal bore and a distal bore and said valve is mounted in said access cannula handle so as to be between the handle proximal bore and the handle distal bore, at least one of the handle proximal bore and the handle distal bore having a diameter greater than the lumen of the access cannula tube.