Method and Apparatus for Trialing and Implanting a Modular Femoral Hip
AssigneeBiomet Manufacturing, LLC
InventorsAaron P. Smith, Tyler D. Witt
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Abstract
A modular femoral hip implant trialing system. The system generally includes a proximal body, a fastener, and a fastener retention member. The proximal body includes a proximal bore, a tapered distal bore, and a passageway connecting the proximal bore to the distal bore. The proximal bore, the distal bore, and the passageway are aligned along a first axis. The fastener includes a head in the proximal bore and a stem in the distal bore, the fastener is aligned along the first axis. The fastener retention member is positioned in the proximal bore and is operable to retain at least a portion of the fastener within the proximal bore.
Claims35
A modular femoral hip implant trialing system comprising:
- a proximal body defining:
- a proximal bore;
- a tapered distal bore;
- and
- a passageway connecting the proximal bore to the distal bore;
- the proximal bore, the distal bore, and the passageway are aligned along a first axis;
- a fastener that includes a head in the proximal bore and a stem in the distal bore, the fastener is aligned along the first axis;
- and
- a fastener retention member positioned in the proximal bore that is operable to retain at least a portion of the fastener within the proximal bore.
A modular femoral hip implant trialing system comprising:
- a proximal body defining a proximal bore, a distal bore, and a passageway connecting the proximal bore to the distal bore, the proximal bore is axially aligned with the distal bore along a first axis;
- a fastener having a head in the proximal bore and a stem in the distal bore;
- a washer between the head and a base of the proximal bore;
- and
- a fastener retention member in the proximal bore, the retention member and the washer are on opposite sides of the head, the retention member includes an aperture having a diameter smaller than a diameter of the head to retain the fastener within the proximal bore.
A modular femoral hip implant trialing system comprising:
- a proximal body defining a proximal bore, a distal bore, and a passageway connecting the proximal bore to the distal bore, the proximal bore is axially aligned with the distal bore along a first axis;
- a fastener having a head in the proximal bore and a stem in the distal bore;
- a rotational locking device mounted in the distal bore and surrounding the stem including an inner diameter that is larger than an outer diameter of the stem;
- and
- a fastener retention member in the proximal bore between the passageway and the head that is operable to retain the fastener within the proximal bore.
A modular femoral hip implant trialing system comprising:
- a proximal alignment jig portion including a support device operable to support a proximal body having a distal stem mounted thereto;
- a distal alignment jig portion including an alignment guide that is operable for use in identifying a first orientation of the distal stem relative to the proximal body, the alignment guide is axially aligned with the support device;
- and
- a support rod connecting the proximal alignment jig portion to the distal alignment jig portion.
A modular femoral hip implant trialing method comprising:
- mounting a trial distal stem to a proximal trialing device by mating a first tapered surface of the trial distal stem with a second tapered surface of the proximal trialing device and by mating a fastening device of the proximal trialing device with a receptacle of the trial distal stem so as to permit rotation of the proximal trialing device with respect to the trial distal stem;
- inserting the trial distal stem in an intramedullary canal of a femur for trialing to determine the appropriate orientation of the proximal trialing device relative to the trial distal stem;
- locking the proximal trialing device to the trial distal stem by rotating the fastening device to drive the fastening device within the receptacle and to further mate the first tapered surface with the second tapered surface to prevent rotation therebetween after trialing;
- mounting the proximal trialing device to a proximal portion of an alignment jig;
- identifying and recording a position of the trial distal stem relative to the proximal trialing device with an alignment guide at a distal portion of the alignment jig;
- removing the proximal trialing device with the trial distal stem mounted thereto from engagement with the alignment jig;
- mounting a proximal body implant to the proximal portion of the alignment jig;
- mounting a distal stem implant to the proximal body implant such that a tip of the distal stem implant approximates the position of the trial distal stem recorded relative to the alignment guide to provide the distal stem implant and the proximal body implant with a relative orientation that is similar to the orientation of the proximal trialing device relative to the distal stem implant during trialing;
- and
- implanting the distal stem implant with the proximal body implant mounted thereto in the intramedullary canal of the femur.
Dependencies are inferred from the claim text.