Reinforced intramedullary nail

• US 9,597,129 B2
• Filed: 05/23/2008
• Issued: 03/21/2017
• Est. Priority Date: 05/25/2007
• Status: Active Grant

• Current Assignee: Zimmer GmbH (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer GmbH (Zimmer Biomet Holdings, Inc.)
• Inventors: Keller, Samuel, Velikov, Jordan, Senger, Reto
• Primary Examiner(s): Merene, Jan Christopher
• Assistant Examiner(s): MAHMUD, ATIYA S
• Application Number:
  US12/601,680
• Publication Number:
  US 20100179551A1
• Time in Patent Office: 3,224 Days
• Field of Search: 606 62- 68
• US Class Current: 1/1
• CPC Class Codes: A61B 17/7258 with laterally expanding parts, e.g. for gripping the bone
• CPC Class Codes: A61B 17/7283 with special cross-section of the nail
• CPC Class Codes: A61B 17/7291 for small bones, e.g. in the foot, ankle, hand or wrist
• CPC Class Codes: A61B 17/744 the longitudinal elements coupled to an intramedullary nail

Abstract

An orthopedic implant assembly is disclosed for the treatment of fracture or other trauma to a long bone. The implant assembly includes an intramedullary nail and a lag screw that extends through a transverse bore of the intramedullary nail. The intramedullary nail includes an elongated body and one or more enlarged portions positioned adjacent to the transverse bore to reinforce the intramedullary nail.

Claims

1. An intramedullary nail configured for receipt in a long bone, comprising:

an elongated body having a lateral side, a medial side, and a transverse bore extending therethrough having a longitudinal axis, the transverse bore configured to receive a transverse member extending from the transverse bore, wherein the elongated body includes a first segment extending from a distal extent of the transverse bore to a proximal extent of the transverse bore, a second segment immediately proximal to the transverse bore, and a third segment immediately distal to the transverse bore, wherein the lateral side of the elongated body of the first segment includes a bulge positioned adjacent to the transverse bore creating a maximum external profile of the first segment at a first location, positioned along the lateral side of the elongated body, that is greater than at least one of a maximum external profile of the second segment and a maximum external profile of the third segment, the bulge including a ridge extending substantially parallel to the longitudinal axis, the ridge including an apex and a slope that extends radially inward, wherein the medial side of the first segment of the elongated body lacking a bulge positioned adjacent to the transverse bore creating a minimum external profile of the first segment at a second location, positioned along the medial side of the elongated body, that is the same as at least one of the maximum external profile of the second segment and the maximum external profile of the third segment, and wherein the maximum external profile of the first segment is greater than the minimum external profile of the first segment, and wherein the first location and the second location are positioned on a plane perpendicular to a longitudinal axis of the first segment of the elongated body.

2. The intramedullary nail of claim 1, wherein the second and third segments are substantially cylindrical.

3. The intramedullary nail of claim 1, wherein the first segment includes a longitudinal axis and a plane included in the longitudinal axis that divides the first segment into a medial portion and a lateral portion, and the bulge extends to the plane.

4. An intramedullary nail configured for receipt in a long bone, comprising:

a transverse member; and

an elongated body having a longitudinal axis and a transverse bore extending therethrough and configured to receive the transverse member extending from the transverse bore, the transverse member having sufficient length to extend beyond the elongated body and into the bone, wherein the elongated body includes a first segment extending from a distal extent of the transverse bore to a proximal extent of the transverse bore and including an enlarged portion, a second segment immediately proximal to the transverse bore, and a third segment immediately distal to the transverse bore, the enlarged portion defined by a surface of the elongated body and creates a non-uniform exterior profile along a longitudinal length of the first segment, wherein the enlarged portion includes a first radial-most extent at a first location along the longitudinal length, a second radial-most extent at a second location along the longitudinal length, and a third radial-most extent at a third location along the longitudinal length, the first, second, and third locations being longitudinally spaced apart, the second radial-most extent being positioned further away from the longitudinal axis than at least one of the first and third longitudinal extents and the second radial-most extent being positioned between the first and third location, and wherein the enlarged portion includes at least one of a proximal-most extent that terminates distally of the proximal-most extent of the transverse bore and a distal-most extend that terminates proximally of the distal-most extent of the transverse bore.

5. The intramedullary nail of claim 4, wherein the exterior profiles of the second and third segments are substantially circular immediately adjacent the transverse bore.

6. The intramedullary nail of claim 4, wherein the elongated body includes another enlarged portion positioned adjacent to the transverse bore.

7. The intramedullary nail of claim 4, wherein the enlarged portion includes the proximal-most extent that terminates distally of the proximal-most extent of the transverse bore and the distal-most extent that terminates proximally of the distal-most extent of the transverse bore.

8. An intramedullary nail configured for receipt in a long bone, comprising:

an elongated body having a longitudinal axis, a medial side, a lateral side, and a transverse bore extending from the lateral side to the medial side and configured to receive a transverse member, the elongated body having a first segment extending from a distal extent of the transverse bore to a proximal extent of the transverse bore and including an enlarged portion positioned adjacent to the transverse bore, wherein the enlarged portion includes at least one of a proximal-most extent that terminates distally of the proximal-most extent of the transverse bore and a distal-most extend that terminates proximally of the distal-most extent of the transverse bore, wherein the medial side of the first segment of the elongated body has a maximum medial extent measured medially from the longitudinal axis along a plane perpendicular to the longitudinal axis and the lateral side of the first segment of the elongated body having a maximum lateral extent measured laterally from the longitudinal axis along the plane perpendicular to the longitudinal axis, the maximum lateral extent differing from the maximum medial extent, wherein the traverse bore has a longitudinal axis and the enlarged portion includes a ridge extending substantially parallel to the longitudinal axis of the transverse bore, the ridge including an apex and a slope that extends radially inward.

9. The intramedullary nail of claim 8, wherein the elongated body includes a second segment immediately proximal to the transverse bore, and a third segment immediately distal to the transverse bore, the first segment has an exterior profile larger than the exterior profiles of the second and third segments.

10. The intramedullary nail of claim 9, wherein the exterior profiles of the second and third segments are substantially circular.

11. The intramedullary nail of claim 8, wherein the elongated body includes an opening to the transverse bore, the opening has a distal half and a proximal half, and the enlarged portion is positioned adjacent to the proximal half.

12. The intramedullary nail of claim 8, wherein the elongated body includes a substantially cylindrical portion and the enlarged portion is positioned adjacent to the substantially cylindrical portion.

13. The intramedullary nail of claim 8, wherein the apex and the slope extend in a longitudinal and radially inward direction relative to the longitudinal axis of the elongated body.

14. The intramedullary nail of claim 8, wherein the enlarged portion is located on the lateral side of the first segment of the elongated body, the maximum lateral extent exceeding the maximum medial extent.

15. An intramedullary nail configured for receipt in a long bone, comprising:

an elongated body having a longitudinal axis, a medial side, a lateral side, and a transverse bore extending from the lateral side to the medial side and configured to receive a transverse member, the elongated body having a first segment extending from a distal extent of the transverse bore to a proximal extent of the transverse bore and including an enlarged portion positioned adjacent to the transverse bore, wherein the enlarged portion includes at least one of a proximal-most extent that terminates distally of the proximal-most extent of the transverse bore and a distal-most extend that terminates proximally of the distal-most extent of the transverse bore, wherein the medial side and the lateral side of the elongated body at the first segment are asymmetrically arranged relative to the longitudinal axis, wherein the enlarged portion is located on the lateral side of the first segment of the elongated body, the lateral side of the first segment of the elongated body having a non-circular outer periphery along a plane perpendicular to the longitudinal axis, and the medial side of the first segment of the elongated body having a circular outer periphery along the plane perpendicular to the longitudinal axis, and wherein the transverse bore has a longitudinal axis and the enlarged portion includes a ridge extending substantially parallel to the longitudinal axis of the transverse bore, the ridge including an apex and a slope that extends radially inward.

16. The intramedullary nail of claim 15, wherein the elongated body includes a first edge defining a lateral opening into the transverse bore and a second edge defining a medial opening into the transverse bore, the first edge includes a distal-most portion positioned at a first longitudinal position and a proximal-most portion positioned at a second longitudinal position, and the apex is positioned longitudinally between the first longitudinal position and the second longitudinal position.