Apparatus for, and method of, preparing hip prosthesis implantation
First Claim
1. Apparatus for use with a femur in a hip replacement where the femur has a hollow cavity defined by inner walls in the femur and where bone particles are implantable in the hollow cavity in the femur,a tamp having an elongated shaft shaped to extend into the hollow cavity in the femur, the shaft having a collar at an intermediate position along the length of the shaft, the collar extending outwardly from the shaft in a direction transverse to the length of the shaft and being dimensional for disposition against the inner walls in the femur to provide for a packing of the bone particles in the hollow cavity in the femur in the space in the cavity below the collar.
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Accused Products
Abstract
Each tamp in a sequence has a collar at a progressively increased distance from the bottom of a cavity in a femur relative to other tamps in the sequence. The collar on each tamp has progressively increased dimensions relative to collars on other tamps to provide a snug fit of such collar against inner walls defining the femur cavity. Bone particles are also disposed in such cavity. After the insertion of each tamp into the cavity, such tamp is driven into the cavity to pack the bone fragments in the cavity against one another, the collar and the femur inner walls. Such tamp is then removed from the cavity and the next tamp in the sequence is inserted, and driven, into the cavity. The distance for driving each tamp into the cavity may be defined by a coincidence between a marking on such tamp and the top of the femur. When the last tamp in the sequence is removed from the cavity, the cavity is filled with a binder which permeates the space between the bone particles through only a limited distance because of the tight packing of the bone particles. The prosthesis may then be properly positioned in the femur cavity. The prosthesis is slightly narrower than the last tamp so that a thin layer of the binder is formed between the prosthesis and the bone fragments. The binder hardens against the prosthesis and the bone particles to retain the prosthesis fixedly in the cavity.
92 Citations
33 Claims
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1. Apparatus for use with a femur in a hip replacement where the femur has a hollow cavity defined by inner walls in the femur and where bone particles are implantable in the hollow cavity in the femur,
a tamp having an elongated shaft shaped to extend into the hollow cavity in the femur, the shaft having a collar at an intermediate position along the length of the shaft, the collar extending outwardly from the shaft in a direction transverse to the length of the shaft and being dimensional for disposition against the inner walls in the femur to provide for a packing of the bone particles in the hollow cavity in the femur in the space in the cavity below the collar.
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4. In combination,
a femur having a hollow cavity defined by internal walls in the femur, bone particles disposed in the hollow cavity, and a plurality of tamps having characteristics for progressive disposition in the hollow cavity, each individual one of the tamps having an elongated shaft with a collar extending outwardly in a direction transverse to the length of the shaft at an intermediate position along the length of the shaft, the collar in each individual one of the tamps being disposed at an individual one of a plurality of progressive positions along the length of the hollow cavity to provide for the packing of the bone fragments to an individual one of the plurality of the progressive positions along the length of the hollow cavity.
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9. In a method of providing for a prosthesis of a femur in a patient'"'"'s hip, the steps of:
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providing a cavity in the patient'"'"'s femur, disposing a plurality of bone fragments in the femur cavity, providing a tamp having a shaft with a particular length, the shaft having a collar at an intermediate position along the particular length of the shaft and extending outwardly from the shaft in a direction transverse to the length of the shaft, inserting the tamp into the cavity after the disposition of the bone fragments in the cavity, and providing a controlled drive of the tamp into the cavity to pack the tamp against the bone fragments in the cavity. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. In a method of providing a prosthesis in a femur in a patient'"'"'s hip, the steps of:
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providing a cavity in the patient'"'"'s femur, progressively inserting bone fragments into the cavity, providing a plurality of tamps, each having a shaft with a bottom and having a collar extending radially outwardly from the shaft at an individual distance from the bottom of the shaft to provide for the disposition of such collar at an individual one of a plurality of progressive positions in the cavity, and inserting the tamps in sequence into the cavity in accordance with the relative distances of the collar on each of such tamps from the bottom of the shaft on the tamp to provide for the packing of progressive amounts of the bone fragments in the space in the cavity below the collars on the tamps. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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27. In a method of providing for a prosthesis of a femur in a patient'"'"'s hip, the steps of:
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providing a cavity in the patient'"'"'s femur, packing bone fragments into the cavity at progressive incremental heights in the cavity while maintaining the shape of the cavity during such packing to substantially receive the prosthesis, and inserting the prosthesis into the cavity after the bone fragments have been packed into the cavity at the progressive incremental heights. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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Specification