Bone cement nozzle and method
First Claim
1. A bone cement delivery nozzle for flowing bone cement into a long bone medullary canal, the nozzle including a delivery tube, first means at one end of the delivery tube adapted to be attached to a source of bone cement, wherein the improvement comprises a collapsible imperforate bone cement shield, a connection joining the shield to the other end of the delivery tube such that the shield is movable between a collapsed position for insertion into the canal and an expanded position when in the canal, the other end of the tube opening through the shield, the shield when expanded including a flexible outer circumferential portion engagable with the interior of the canal and an interior pressure surface impervious to bone cement facing the bottom of the canal, and second means for holding the shield in the collapsed position during insertion into the canal and permitting movement of the shield to the expanded position following insertion, whereby bone cement flowed through the tube, past the expanded shield and into the bottom of the canal contacts the interior pressure surface of the shield, biases the outer portion of the shield against the canal and expels the nozzle outwardly of the canal thereby cleaning the canal.
3 Assignments
0 Petitions
Accused Products
Abstract
An improved bone cement nozzle and method for use in filling a long bone medullary canal with bone cement. The nozzle includes an expandable shield which scrapes the canal wall and pressurizes the cement as it enters the canal so that it flows into interstices in the bone.
251 Citations
27 Claims
- 1. A bone cement delivery nozzle for flowing bone cement into a long bone medullary canal, the nozzle including a delivery tube, first means at one end of the delivery tube adapted to be attached to a source of bone cement, wherein the improvement comprises a collapsible imperforate bone cement shield, a connection joining the shield to the other end of the delivery tube such that the shield is movable between a collapsed position for insertion into the canal and an expanded position when in the canal, the other end of the tube opening through the shield, the shield when expanded including a flexible outer circumferential portion engagable with the interior of the canal and an interior pressure surface impervious to bone cement facing the bottom of the canal, and second means for holding the shield in the collapsed position during insertion into the canal and permitting movement of the shield to the expanded position following insertion, whereby bone cement flowed through the tube, past the expanded shield and into the bottom of the canal contacts the interior pressure surface of the shield, biases the outer portion of the shield against the canal and expels the nozzle outwardly of the canal thereby cleaning the canal.
- 12. A nozzle for flowing bone cement into a prepared long bone medullary canal, the nozle having a delivery tube, first means at one end of the tube adapted to be attached to a source of bone cement and the other end adapted to be extended into a medullary canal, wherein the improvement comprises an imperforate flexible shield impervious to bone cement secured to the other end of the delivery tube, the shield including a plurality of circumferentially spaced ribs joined to and projecting beyond the other end of the delivery tube with flexible sheeting extending between adjacent ribs from the delivery tube to an outer edge of the shield, said ribs being moveable between a collapsed position where they lie generally parallel to the axis of the tube and the sheeting between adjacent ribs is folded and an expanded position where the ribs extend outwardly of the delivery tube, the outer surface of the shield circumferentially engages the wall of the medullary canal and the ribs and sheeting define an interior shield pressure surface facing the bottom of the canal, and second means operable for controlling movement of the shield from the collapsed position to the expanded position after insertion of the shield into the medullary canal.
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18. The method of filling the medullary canal of a live long bone with bone cement comprising the steps of:
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a. Freely introducing a collapsed bone cement shield into the canal; b. Expanding the shield within the canal; c. Flowing bone cement through the shield to fill the canal beyond the shield and bias the edge of the shield into contact with the surface of the canal; d. Moving the edge of the shield outward along the surface of the canal to clean the surface of blood and any debris; and e. Flowing bone cement into the interstices of bone cleaned by the edge of the shield. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. The method of filling the medullary canal of a live, long bone with bone cement comprising the steps of:
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a. Freely introducing a bone cement shield into the canal; b. Expanding the shield within the canal so that the shield engages a circumferential band of the canal surface and forms a barrier in the canal; and c. Flowing cement through the shield and into the canal thereby forcing the shield outwardly of the canal as it is filled with cement while maintaining contact between the shield and the canal surface to clean the surface of the canal and collect the matter cleaned from the surface on the exterior side of the shield. - View Dependent Claims (26, 27)
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Specification