Telescopic nail and associated perforating tool

Patent metadata

Field	Value
Publication number	US-12357353-B2
Application number	US-202017799376-A
Country	US
Kind code	B2
Filing date	Mar 3, 2020
Priority date	Mar 6, 2019
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

Telescopic nail for the treatment of fractures or deformations of long bones, as for example in the case of osteogenesis imperfecta or pseudo arthrosis. Comprising of a hollow stem; a rod telescopically inserted into said hollow stem; a first fastening element coupled to an end of said hollow stem for fixing to a first long bone end; a second fastening element coupled to an end of said rod for fixing to a second long bone end. Advantageously, one end of said hollow stem is provided with coupling means for coupling to an end of a tool which can be inserted into a cavity formed in the bone for insertion of the nail.

First claim

The invention claimed is:

1. A telescopic nail for treatment of long bones, comprising:
a hollow stem;
a rod telescopically inserted into said hollow stem;
a first fastening element configured to couple to one end of said hollow stem for fixing to a first long bone end;
a second fastening element configured to couple to an end of said rod for fixing to a second long bone end;
an opposite end of said hollow stem being provided with a threaded coupling configured to couple to an end of a tool which can be inserted into a cavity formed in the bone for insertion of the nail;
wherein said one end of the hollow stem is also provided with a respective threaded coupling configured to couple to said end of the tool when not coupled to the first fastening element; and wherein
said first fastening element is structured as a screw with a shank to be coupled to said one end of said hollow stem and a fixing head for fixing to the bone.

2. The telescopic nail according to claim 1 , wherein said threaded coupling of either said one end or said opposite end of the hollow stem is an internally threaded end of said hollow stem for receiving, by means of screwing, an external thread of a coupling end of said tool.

3. The telescopic nail according to claim 2 , wherein the shank of said screw comprises an external thread that may be coupled to one or the opposite internally threaded end of said hollow stem.

4. The telescopic nail according to claim 1 , wherein said second fastening element is fixed or formed as one piece construction to one end of said rod.

5. The telescopic nail according to claim 1 , wherein said fixing head comprises a threaded head portion suitable for being gripped within the bone; said threaded head portion having a conical profile with a taper angle (a) of 145°±20%.

6. The telescopic nail according to claim 1 , wherein said fixing head comprises a threaded head portion suitable for being gripped within the bone; said threaded head portion having a conical profile with a height (H) of 3 mm±20%.

7. The telescopic nail according to claim 1 , wherein said second fastening element comprises a fixing head designed to be fixed to the bone.

8. The telescopic nail according to claim 7 , wherein said fixing head comprises a threaded head portion suitable for being gripped within the bone; said threaded head portion having a conical profile with a taper of 145°±20%.

9. The telescopic nail according to claim 7 , wherein said fixing head comprises a threaded head portion suitable for being gripped within the bone; said threaded head portion having a conical profile with a height of 3 mm±20%.

10. The telescopic nail according to claim 1 , wherein said fixing head comprises:
an internal movement cavity designed to be fixed to an end of an axial movement tool; and
at least a recessed seat designed to provide a form fit coupling with an end of a maneuvering tool, said recessed seat being formed on the outside of said internal movement cavity so as to allow simultaneous coupling of said axial movement tool and said maneuvering tool.

11. A perforating tool comprising:
a perforating end designed to form inside a long bone a cavity for the insertion of a telescopic nail; and
a coupling end disposed opposite to said perforating end and comprising a counter-coupling means couplable with a corresponding coupling means of either said one end or said opposite end of said hollow stem of the telescopic nail according to claim 1 .

12. The perforating tool of claim 11 , wherein the counter-coupling means is configured to selectively couple with the corresponding coupling means at said one end and also at said opposite end of said hollow stem.

13. The telescopic nail according to claim 1 , wherein said threaded couplings of both said one end and of said opposite end of the hollow stem are internally threaded ends of said hollow stem for receiving, by means of screwing, an external thread of a coupling end of said tool.

14. A telescopic nail assembly for treatment of a long bone, comprising:
a telescopic nail including:
a hollow stem;
a rod telescopically inserted into said hollow stem;
a first fastening element coupled to one end of said hollow stem for fixing to a first long bone end;
a second fastening element coupled to an end of said rod for fixing to a second long bone end;
an opposite end of said hollow stem being provided with a coupling; and wherein
said first fastening element is structured as a screw with a shank to be coupled to said one end of said hollow stem and a fixing head for fixing to the long bone; and

a perforating tool comprising:
a perforating end shaped to form a cavity inside the long bone for the insertion of the telescopic nail; and
a coupling end disposed opposite said perforating end and comprising a counter-coupling couplable with the coupling at said opposite end of said hollow stem of the telescopic nail.

15. The telescopic nail assembly of claim 14 , wherein the coupling is threaded coupling.

16. The telescopic nail assembly of claim 14 , wherein the counter-coupling of the coupling end of the perforating tool is couplable also with said one end of the hollow stem of the telescopic nail.

Assignees

• Orthofix Srl

Inventors

• Venturini Daniele
• Finidori Georges Fernand Jacques
• Pejin Zagorka

Classifications

• A61F2/4607

  of hip femoral endoprostheses · CPC title

• A61B17/862

  at the periphery of the screw head · CPC title

• A61B17/1725

  for applying transverse screws or pins through intramedullary nails or pins · CPC title

• A61B17/1662

  for particular parts of the body · CPC title

• A61B17/7216

  for bone lengthening or compression (A61B17/7258 takes precedence) · CPC title