Locking nail

• US 4,976,258 A
• Filed: 05/05/1988
• Issued: 12/11/1990
• Est. Priority Date: 03/09/1983
• Status: Expired due to Term

• Current Assignee: Howmedica International S. De R.L. (Stryker Corporation)
• Original Assignee: Howmedica International Incorporated
• Inventors: Vecsei, Vilmos, Richter, Karl M.
• Primary Examiner(s): Mancene, Gene
• Assistant Examiner(s): Hakomaki, J.
• Application Number:
  US07/191,745
• Time in Patent Office: 950 Days
• Field of Search: 128/92 B, 128/92 BC, 128/92 BA, 128/92 BB, 128/92 R, 128/92 Y, 128/92 YZ, 128/92 YK, 128/92 YS, 128/92 YE
• US Class Current: 606/64
• CPC Class Codes: A61B 17/72 Intramedullary pins, nails or other devices A61B17/744 takes precedence
• CPC Class Codes: A61B 17/7283 with special cross-section of the nail

Abstract

A hollow elongated medullary bone nail capable of being locked in place with at least a pair of transversely-disposed bone screws is disclosed. The radius in transverse cross-section of the outer surface of the nail varies over the circumference of the cross-sectional profile of the nail in such a manner that a steadily rounded contour results.

Claims

1. A bone nail for the treatment of bone fractures comprising an elongated hollow body tapered at the front end and having an enlargement at the rear end by which it is driven into a bone of a patient for the accommodation of a driving tool and at least one pair of transverse bores for the accommodation of bone screws, one of said bores being adjacent the front end of said body and one of said bores being adjacent the rear end of said body, with the cross-sectional profile of said body being closed over the circumference of said profile in the shape of a ring, and with the radius of the outer surface of said body changing over said circumference in such a manner that a steadily rounded contour results and said outer surface is provided with alternating elevations and depressions over the circumference thereof.

2. A bone nail according to claim 1 wherein the points of the elevations and depressions disposed farthest radially outward and farthest radially inward are each disposed on a circular arc concentric with respect to the axis of the nail.

3. A bone nail according to claim 2 wherein said cross-sectional profile is provided with three circular-shaped elevations uniformly spaced over the circumference thereof with relatively flatly rounded depressions disposed therebetween.

4. A bone nail according to claim 2 wherein said cross-sectional profile corresponds to a Maltese cross with rounded tooth peaks.

5. A bone nail according to claim 1 wherein the inner canal of said elongated hollow body is circularly-shaped in cross-section.

6. A bone nail according to claim 2 wherein the wall of said elongated hollow body is of approximately uniform thickness in cross-section over the circumference of said profile.