Intramedullary rod apparatus and methods of repairing proximal humerus fractures
DCFirst Claim
1. A bone stabilizing device, comprising:
- a stem member, extending substantially along a first longitudinal axis, for insertion into a medullary bone cavity, said stem member having a distal end and a proximal end;
ana substantially cylindrical extension member positioned substantially outside of the medullary bone cavity, extending substantially along a second longitudinal axis, having a distal and a proximal end, said distal end connected to said proximal end of said stem member; and
means for securing a fractured metaphyseal or epiphyseal bone to said extension member comprising a securing member having a first end affixed into mechanically attached to the extension member and a second end spaced apart from said extension member, and means connected to said second end for pressing on a cortical surface of the bone to urge the bone against said extension member, wherein a third longitudinal axis of the securing member is unaligned with the second longitudinal axis of the extension member.
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Abstract
A bone stabilizing apparatus includes a stem member and an extension member, the stem member having a distal end for insertion within the intramedullary canal of a human humerus and the proximal end connected to the extension member. The extension member has radially directed threaded holes either pre-formed or created after the bone stabilizing apparatus is installed into the humerus. The threaded holes allow fixation of stabilizing screws with suture posts, or a washer structure to grip the surface of the bone and/or surrounding ligaments or muscle. A prosthetic or the natural humeral head can be attached to the extension member. In a preferred embodiment a guide structure directs the drill and stabilizing screws radially through the central axis of the extension member.
50 Citations
26 Claims
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1. A bone stabilizing device, comprising:
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a stem member, extending substantially along a first longitudinal axis, for insertion into a medullary bone cavity, said stem member having a distal end and a proximal end; ana substantially cylindrical extension member positioned substantially outside of the medullary bone cavity, extending substantially along a second longitudinal axis, having a distal and a proximal end, said distal end connected to said proximal end of said stem member; and means for securing a fractured metaphyseal or epiphyseal bone to said extension member comprising a securing member having a first end affixed into mechanically attached to the extension member and a second end spaced apart from said extension member, and means connected to said second end for pressing on a cortical surface of the bone to urge the bone against said extension member, wherein a third longitudinal axis of the securing member is unaligned with the second longitudinal axis of the extension member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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12. A bone stabilizing device comprising:
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a stem member, extending substantially along a first longitudinal axis, for insertion into a bone cavity; ana substantially cylindrical extension member, connected to said stem member, said extension member having a plastic material,and extending substantially along a second longitudinal axis; a prosthetic head having a mounting surface and a hemispherical shaped surface formed about a centerline; and means for securing said prosthetic head to said extension member, said means comprising; a support member connected to said extension member having a head support surface facing toward said mounting surface of said prosthetic head, said head support surface forming a predetermined angle with said extension member, a hole formed in said support member and projecting into said head support surface toward said extension member, and a pin connected to said mounting surface of said prosthetic head; and means for securing a fractured metaphyseal bone to said extension member, said means for securing bone comprising; an attachment screw having a threaded portion engaged with said extension member and having a screw head spaced apart from an outer surface of said extension member, wherein a rotation of said threaded attachment screw urges said screw head against the bone and thereby urges the bone against the extension member.
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13. A bone stabilizing device comprising:
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a stem member, extending substantially along a first longitudinal axis, for insertion into a bone cavity, said stem member having a distal end and a proximal end; an extension member, extending substantially along a second longitudinal axis, having a distal and a proximal end; a spacer bracket having a mounting flange with a hole formed therein and having a support face; a threaded extension, formed on one of said proximal end of said stem member and said distal end of said extension member, said threaded extension passing through said hole in said mounting flange and threading into a threaded hole formed in the other of said proximal end of said stem member and said distal end of said extension member, so as to securely mount said mounting flange to said extension member and said stem member; a prosthetic head having a substantially planar surface and having a hemispherical shaped surface formed about a centerline extending normal to said planar surface; and means for securing said prosthetic head to said spacer bracket, said means comprising a tapered hole extending normal into a plane of the support face of said spacer bracket and a tapered pin connected to the planar surface of said prosthetic head. - View Dependent Claims (14)
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Specification