Condylar fracture fixation system

Patent metadata

Field	Value
Publication number	US-2016256207-A1
Application number	US-201514640456-A
Country	US
Kind code	A1
Filing date	Mar 6, 2015
Priority date	Mar 6, 2015
Publication date	Sep 8, 2016
Grant date	—

Abstract

A condylar fracture fixation system for use with an intramedullary nail includes a longitudinally extending rod having first and second ends, each end having outwardly extending threads or ridges. The rod extends along a first longitudinal axis which extends in a medial-lateral direction in use. A first and second nut is provided each nut having first and second ends. The second end of each nut having an opening formed by a plurality of resilient legs for respectively receiving the first and second ends of the rod. The second end of the first and second nuts include ridges or threads extending into the opening in each nut. The inwardly extending ridges of nuts respectively engaging the outwardly extending threads or ridges of the rod. A flexible washer is connected to the first end of each nut.

First claim

1 . A fracture fixation system comprising:
a longitudinally extending rod having first and second ends, each end having outwardly extending ridges, the rod extending along a first longitudinal axis; a first and second nut each having first and second ends, the second end having an opening for respectively receiving the first and second ends of the rod, the second end of the first and second nuts including ridges extending into the opening in each nut, the inwardly extending ridges of the first and second nuts respectively engaging the outwardly extending ridges of the rod first and second ends; and a washer having opposed bendable portions engaging the first end of both the first and second nuts.

2 . The fracture fixation system as set forth in claim 1 wherein the radially outwardly extending ridges of the first and second rod ends are formed as a helical thread.

3 . The fracture fixation system as set forth in claims 2 wherein the radially inwardly extending ridges of the first and second nut are formed as helical threads.

4 . The fracture fixation system as set forth in claim 1 wherein the flexible washer and nut are connected.

5 . The fracture fixation system as set forth in claim 4 wherein the washer and nut construct is made of a material selected from the group consisting of a polymeric material, titanium, a titanium alloy and stainless steel.

6 . The fracture fixation system as set forth in claim 1 wherein the flexible washer is made of metal having a thickness of 1 to 3 mm.

7 . The fracture fixation system as set forth in claim 6 wherein the first and second nuts have a body portion at the first end with a plurality of flexible legs extending outwardly from the body portion towards the second end of the nut, the legs, and surrounding the central opening, the ridges located on an inner surfaces of the legs.

8 . The fracture fixation system fracture fixation system as set forth in claim 7 wherein the first and second nuts have four legs.

9 . The fracture fixation system fracture fixation system of claim 1 wherein the flexible washer is non-circular.

10 . The fracture fixation system fracture fixation system of claim 9 wherein the flexible washer has two diametrically opposed oval portions.

11 . The fracture fixation system fracture fixation system as set forth in claim 7 wherein the body portion of each nut has a circumferential groove for receiving an inner surface of each washer.

12 . The fracture fixation system fracture fixation system as set forth in claim 1 further comprising an intramedullary nail having a bore for receiving the longitudinally extending rod.

13 . A fracture fixation system fracture fixation system comprising:
a longitudinally extending rod having first and second ends, the first and second ends having a plurality of radially outwardly extending protrusions; first and second nuts each nut having a hollow interior portion having an open end for receiving the first and second ends of the rod, the interior portion of the first and second nuts having a plurality of recess for receiving the outwardly extending protrusions on the first and second ends of the rod; a flexible washer mounted on an end of each of the first and second nuts opposite the open end.

14 . The fracture fixation system as set forth in claim 13 , wherein the radially outwardly extending protrusions of the first and second rod ends are formed as a helical thread.

15 . The fracture fixation system as set forth in claims 14 wherein the radially inwardly extending recesses of the first and second nut are formed as helical threads.

16 . The fracture fixation system as set forth in claim 13 wherein the flexible washer and nut are connected together.

17 . The fracture fixation system as set forth in claim 16 wherein the nut and washer are a one-piece construct made of a material selected from the group consisting of a polymeric material, titanium, a titanium alloy and stainless steel.

18 . The fracture fixation system as set forth in claim wherein the flexible washer is made of metal having a thickness of 1 to 3 mm.

19 . The fracture fixation system as set forth in claim 13 wherein the first and second nuts have a body portion at the first end with a plurality of flexible legs extending outwardly from the body portion towards the second end, and surrounding the central opening, the ridges located on inner surfaces of the legs.

20 . The fracture fixation system as set forth in claim 19 wherein the first and second nuts have four legs.

21 . The fracture fixation system of claim 13 wherein the flexible washer is non-circular.

22 . The fracture fixation system of claim 21 wherein the flexible washer has two diametrically opposed oval portions.

Assignees

• Stryker European Holdings I Llc

Inventors

• Zander Nils
• Wieland Manfred
• Ricciardi Giovanni

Classifications

• A61B17/84 Primary

  Fasteners therefor {or fasteners being internal fixation devices} · CPC title

• A61B17/683 Primary

  comprising bone transfixation elements, e.g. bolt with a distal cooperating element such as a nut · CPC title

• A61B17/8665

  Nuts · CPC title

• A61B17/7233

  with special means of locking the nail to the bone · CPC title

• A61B17/725

  with locking pins or screws of special form · CPC title