Temporomandibular prosthetic joint
OwnerDavid C. Hoffman, Michael J. Pappasinventors
Life of this patent
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Abstract
A temporomandibular joint prosthesis is provided. The prosthesis includes the condyle component for attachment to the ramus of a temporomandibular joint to replace the natural condylar head. The condyle component is attached to the natural ramus by a fixation system that may include plasma-sprayed pegs or plasma-sprayed double screws. The prosthesis further includes a fossa component assembly having a metallic bone attachment member and a plastic bearing. The plastic bearing is disposed and configured for articular bearing engagement with the condyle component of the prosthesis.
Claims17
A temporomandibular prosthetic joint comprising:
- a metallic condyle component having an elongate ramus attachment portion with opposed superior and inferior ends and bone attachment means intermediate said ends, a generally condylar head disposed at said superior end of said ramus attachment portion, said condylar head being a surface of revolution defined by rotating a curve about a medial-to-lateral axis and having opposed medial and lateral ends, portions of said head in proximity to said medial and lateral ends being tapered toward the medial-to-lateral axis of the condylar head;
- a fossa component having a metallic bone attachment member and a bearing member formed from a non-metallic material, said bearing member having an inferior bearing surface in articular and sliding bearing engagement with said condylar head, said bearing surface being configured to permit a major articulation of said condyle component about a medial-to-lateral axis, a minor articulation of said condyle component about an anterior-to-posterior axis and translation of said condylar head on said bearing surface in a substantially anterior-to-posterior direction.
A temporomandibular prosthetic joint comprising:
- a metallic condyle component having an elongate ramus attachment portion with opposed superior and inferior ends and bone attachment means intermediate said ends, a condylar head disposed at said superior end of said ramus attachment portion, said head being a surface of revolution defined by rotating a curve about a medial-to-lateral axis and having opposed medial and lateral ends, portions of said head in proximity to said medial and lateral ends being tapered toward the medial-to-lateral axis of the condylar head;
- and
- a fossa component having a metallic bone attachment member with a superior wall and a posterior wall extending from said superior support wall, said superior wall having an inferior surface, and said posterior support wall having an anterior surface, a bearing member formed from a high molecular weight polyethylene, said bearing member having a superior wall with a superior surface engaged with the inferior surface of the superior wall of the bone attachment member, said bearing member further having a posterior wall with a posterior surface engaging the anterior surface of the posterior wall of the bone attachment member, said bearing member further including a substantially concave inferior bearing surface facing away from said bone attachment member for articular and sliding bearing engagement with said condylar head, said inferior bearing surface of said bearing member including generally cylindrically concave section formed by portions of said inferior and posterior walls of said bearing member and being substantially congruent with portions of said condylar head between said medial and lateral ends, said inferior bearing surface further comprising a substantially planar section extending generally anteriorly and tangently from said cylindrically concave region for permitting sliding movement of said condylar head in a substantially anterior-to-posterior direction on said bearing member.
Dependencies are inferred from the claim text.