FEMORAL NECK FRACTURE IMPLANT

• US 20140094803A1
• Filed: 11/19/2012
• Published: 04/03/2014
• Est. Priority Date: 11/18/2011
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Synthes USA LLC (Johnson & Johnson)
• Inventors: Overes, Tom, Mueller, David, Oswald, Martin
• Granted Patent: US 9,314,283 B2
• Time in Patent Office: Days
• US Class Current: 606/66
• CPC Class Codes: A61B 17/74 Devices for the head or neck or trochanter of the femur trochanteric devices connected to the proximal part of an endoprosthetic femoral shaft A61F2/30739; endoprosthetic internal fixation devices for the head or neck of the femur A61F2/3601
• CPC Class Codes: A61B 17/746 the longitudinal elements coupled to a plate opposite the femoral head
• CPC Class Codes: A61B 17/8057 the interlocking form comprising a thread
• CPC Class Codes: A61B 17/8605 Heads, i.e. proximal ends projecting from bone
• CPC Class Codes: A61B 17/863 with thread interrupted or changing its form along shank, other than constant taper
• CPC Class Codes: A61B 17/864 hollow, e.g. with socket or cannulated
• CPC Class Codes: A61B 17/8685 comprising multiple separate parts
• CPC Class Codes: A61B 17/90 Guides therefor

Abstract

A device for implanting a bone fixation system comprises an insertion instrument extending from a proximal end to a distal end, the distal end having an engagement portion for removably engaging a proximal end of a bone plate, the insertion instrument having an elongated channel extending therethrough to permit insertion of a first protection sleeve therethrough, wherein a longitudinal axis of the elongated channel is coaxial with a longitudinal axis of a first opening extending through the bone plate and a first protection sleeve insertable into the elongated channel and guiding insertion of an anti-rotation screw therethrough and through the bone plate, a longitudinal axis of the first protection sleeve being angled with respect to the longitudinal axis of the elongated channel.

Claims

1. A device for implanting a bone fixation system, comprising:

an insertion instrument extending from a proximal end to a distal end, the distal end having an engagement portion for removably engaging a proximal end of a bone plate, the insertion instrument having an elongated channel extending therethrough to permit insertion of a first protection sleeve therethrough, wherein a longitudinal axis of the elongated channel is coaxial with a longitudinal axis of a first opening extending through the bone plate; and

a first protection sleeve insertable into the elongated channel and guiding insertion of an anti-rotation screw therethrough and through the bone plate, a longitudinal axis of the first protection sleeve being angled with respect to the longitudinal axis of the elongated channel.

2. The device of claim 1, wherein the first protection sleeve and the elongated channel enclose an angle of one of 5°

, 6°

, 7.5° and

8°

.

3. The device of claim 1, wherein the first protection sleeve and the elongated channel enclose an angle greater than 5°

.

4. The device of claim 1, further comprising a second protection sleeve insertable into the insertion instrument and guiding insertion of a locking screw therethrough and into a second opening in the bone plate.

5. The device of claim 4, wherein the second protection sleeve and the elongated channel enclose an angle of approximately 45°

.

6. The device of claim 4, wherein the insertion instrument includes an arm extending away from the proximal end, the arm including an opening extending therethrough to guide insertion of the second protection sleeve.

7. The device of claim 1, further comprising an elongated shaft portion connected to the first protection sleeve, the elongated shaft portion being insertable into the elongated channel.

8. The device of claim 7, wherein a proximal end of the elongated shaft portion includes a locking mechanism to lockingly engage the insertion instrument.

9. The device of claim 8, wherein the locking mechanism includes a deflectable tab configured to engage a corresponding opening formed in the insertion instrument with a snap-fit.

10. The device of claim 8, wherein the locking mechanism includes a threaded portion and a screw mechanism, wherein rotation of the screw causes a rotation of the elongated shaft relative to the first protection sleeve to permit the threaded portion to threadedly engage a corresponding threaded opening in the insertion instrument.

11. The device of claim 7, wherein the elongated shaft portion is connected to the first protection sleeve via a Y-connector.

12. The device of claim 1, wherein a side wall of the insertion instrument includes an elongated slot open to the elongated channel, the slot permitting insertion of the Y-connector therepast.

13. The device of claim 1, wherein the device is a single-use assembly.

14. The device of claim 1, wherein the device may be used to perform a plurality of procedures.

15. An aiming instrument to guide insertion of a bone fixation device into a bone, comprising:

an aiming arm including a first portion and a second portion, the first portion extending from a proximal end to a distal end and having an elongated channel extending therethrough, the distal end having an engagement portion removably engaging a proximal end of the bone fixation device, a side wall of the aiming arm including an elongated slot open to the elongated channel; and

an elongated element removably insertable into the elongated channel, the elongated element having a first shaft portion and a second shaft portion, the first shaft portion being inserted into the elongated channel and lockingly engaging the aiming arm, the second shaft portion extending through the elongated slot and having an opening extending therethrough to guide insertion of an anti-rotation screw therethrough and into the bone fixation device.

16. The aiming instrument of claim 15, wherein the second portion includes an opening extending therethrough, an opening axis of the opening being angled with respect to an axis of the elongated channel.

17. The aiming instrument of claim 16, further comprising a protection sleeve insertable through the opening toward the distal end of the first portion such that a distal end of the protection sleeve is positioned adjacent to a proximal end of the bone fixation device.

18. A method of implanting a bone fixation device into a bone, comprising:

engaging a distal end of a guide assembly to a proximal end of a bone fixation device so that a first portion of the guide assembly having an elongated channel extending therethrough is coaxial with a longitudinal axis of the bone fixation device, wherein the first portion extending from a proximal end to a distal end;

inserting an elongated shaft portion through the elongated channel, the elongated shaft portion including a first protection sleeve;

inserting the bone fixation device into a shaft of the bone so that a first portion of the bone plate is positioned over an outer surface of the bone and a second portion of the bone plate is received within the bone; and

inserting an anti-rotation screw through the first protection sleeve until a shaft of the anti-rotation screw extends out of the bone fixation device at an angle offset from the longitudinal axis of the bone fixation device.

19. The method of claim 18, wherein the implanted anti-rotation screw is offset from the longitudinal axis of the bone fixation device by approximately 7.5°

.

20. The method of claim 18, further comprising the step of inserting a second protection sleeve through an opening formed in a second portion of the guide assembly and inserting a locking screw through the second protection sleeve and bone fixation device and into the bone.