Instrument for intra-operative implant templating using fluoroscopy
A surgical instrument having a first assembly with a first radio-opaque portion providing a profile of a first portion of an intramedullary implant or canal in a bone, and a second assembly having a second radio-opaque portion providing a profile of a second portion of the intramedullary implant or canal. The surgical instrument may also include a third radio-opaque portion providing an alignment feature to provide a fluoroscopic planar check for the surgical instrument.
1. An instrument, comprising:
a body formed from a radiolucent material;
a first set of radio-opaque members disposed in the radiolucent body, a first member of the first set of radio-opaque members elongate from a respective first end to a respective second end along a first longitudinal axis, and a second member of the first set of radio-opaque members elongate from a respective first end to a respective second end along a second longitudinal axis, the first and second longitudinal axes being substantially parallel, such that the first set of radio-opaque members collectively define a first profile that corresponds to an outline shape of a first portion of an orthopedic implant over which the instrument is overlaid; and
a second set of radio-opaque members disposed in the radiolucent body, a first member of the second set of radio-opaque members elongate from a respective first end to a respective second end along a third longitudinal axis, and a second member of the second set of radio-opaque members elongate from a respective first end to a respective second end along a fourth longitudinal axis, such that the second set of radio-opaque members collectively define a second profile that corresponds to an outline shape of a second portion of the overlaid orthopedic implant, wherein the third and fourth longitudinal axes intersect to form an acute angle such that the first profile differs from the second profile and the second profile has a taper in a direction away from the first set of radio-opaque members.
2. The instrument of claim 1 , further comprising a third set of radio-opaque members disposed in the radiolucent body, the third set of radio-opaque members collectively defining an alignment feature of the instrument.
3. The instrument of claim 2 , wherein the third set of radio-opaque members includes a peg and a ring.
4. The instrument of claim 3 , wherein the ring circumscribes the peg when the instrument is properly aligned with a first anatomic viewing plane.
5. The instrument of claim 4 , wherein the first and second longitudinal axes define a plane and the ring circumscribes the peg when the instrument is viewed perpendicular to the plane.
6. The instrument of claim 1 , wherein the first and second longitudinal axes are parallel.