Plate connection

Patent metadata

Field	Value
Publication number	US-11259852-B2
Application number	US-201916553676-A
Country	US
Kind code	B2
Filing date	Aug 28, 2019
Priority date	Aug 28, 2019
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A bone fixation system includes a first plate including a plate body and a connection portion extending distally therefrom, the connection portion including a positioning tab at a distal end thereof, the connection portion including a first opening extending therethrough and a ramped part, and a second plate including a coupling aperture along a proximal portion thereof, the coupling aperture configured to receive the positioning tab therein, the coupling aperture including a ramped proximal face configured to abut against the ramped part of the second surface of the positioning tab when the positioning tab is inserted into the coupling aperture, the head portion including a second opening extending therethrough. A connection screw configured to extend through the first opening and the second opening to couple the first and second plates together. Tightening the screw translates the ramped proximal face along the ramped part, eliminating a connection gap therebetween.

First claim

What is claimed is:

1. A bone fixation system, comprising:
a first plate including a plate body extending from a proximal end to a distal end and including a plurality of bone fixation openings extending therethrough from a first surface of the body which, when the first plate is in an operative position, is configured to face away from a bone, to a second surface which, when the first plate is in an operative position, is configured to face the bone, the first plate further including a connection portion extending distally from the plate body, the connection portion including a positioning tab at a distal end thereof, the connection portion including a first opening extending from the first surface to the second surface, the second surface of the connection portion including a ramped part;
a second plate extending from a proximal end to a distal end and including a coupling aperture along a proximal portion thereof, the coupling aperture configured to receive the positioning tab therein, the coupling aperture including a ramped proximal face configured to abut against the ramped part of the second surface of the positioning tab when the positioning tab is inserted into the coupling aperture, the proximal end including a second opening extending therethrough from a first surface of the second plate which, when the second plate is in an operative position, is configured to face away from the bone, to a second surface which, when the first plate is in an operative position, is configured to face toward the bone; and
a connection screw configured to extend through the first opening and the second opening to couple the first and second plates together so that, as the connection screw is tightened, the ramped proximal face translates along the ramped part and one of the first and second openings shifts relative to the other of the first and second openings, eliminating a connection gap between the first and second plates.

2. The system of claim 1 , wherein the second plate further includes an indented engagement portion on the first surface thereof, the engagement portion extending from the coupling aperture to the proximal end of the second plate, the engagement portion being sized and shaped to receive the connection portion of the first plate therein when the positioning tab is inserted into the coupling aperture.

3. The system of claim 2 , wherein the second opening extends through the engagement portion.

4. The system of claim 1 , wherein the first and second openings include threading on an interior surface thereof configured to mate with a threading on an outer surface of the connection screw.

5. The system of claim 1 , wherein a portion of a proximal face of the second plate is configured to abut a correspondingly sized and shaped wall of the connection portion extending along the second surface of the first plate at a proximal end of the connection portion.

6. The system of claim 1 , wherein the connection screw includes a shaft and a head configured to be manually tightened.

7. The system of claim l , wherein a first surface of the positioning tab is configured to abut a second surface of the proximal end, distal of the coupling aperture.

8. The system of claim 1 , wherein the ramped proximal face is angled at 20 to 40 degrees relative to the second surface of the second plate.

9. The system of claim 8 , wherein the angle of the ramped part relative to a second surface of the positioning tab corresponds to an angle of the ramped proximal face of the second plate.

10. The system of claim 1 , wherein the positioning tab and the coupling aperture are configured to self-align to connect the first plate to the second plate.

11. The system of claim 1 , wherein one of the first and second openings is larger than the other of the first and second openings.

12. A bone fixation system, comprising:
a base plate defined via a first surface which, in an operative position, is configured to face away from the hone, and a second surface which, in the operative position, is configured to face toward the bone, and including a head portion and a shaft portion extending distally from the head portion, the head portion including an engagement portion extending along the first surface of the head portion, the engagement portion including a coupling aperture at a distal end thereof, and a ramped face tapering toward the coupling aperture; and
an attachment plate defined via a first surface which, in an operative position, is configured to face away from the bone, and a second surface which, in the operative position, is configured to face toward the bone, and including a plate body and a connection portion extending distally there from for coupling the attachment plate to the base plate, the connection portion sized and shaped to engage the engagement portion of the base plate and including a positioning tab at a distal end thereof, the positioning tab sized and shaped to be inserted through the coupling aperture so that the positioning tab is engageable with a portion of the second surface of the base plate distal of the coupling aperture, the connection portion including a ramped portion extending along the second surface thereof so that, when the positioning tab is inserted into the coupling aperture, the ramped portion is slidable along the ramped face to eliminate a connection gap between the connection portion and the engagement portion,
wherein the base plate includes a connection screw opening extending through a portion of the engagement portion proximal of the ramped face and the attachment plate includes a connection screw opening extending through a portion of the connection portion proximal of a ramped surface, the connection screw openings being configured so that, as a connection screw is tightened through the connection screw openings, the ramped portion slides along the ramped face and one of the connection screw openings shifts relative to the other of the connection screw openings to eliminate the connection gap.

13. The system of claim 12 , wherein the connection screw opening of the base plate includes a threading configured to engage a correspondingly threaded exterior surface of a connection screw.

14. The system of claim 13 , wherein, when the connection screw opening of the base plate is configured to receive a connection screw therein coaxially aligned with a central axis of the connection screw opening of the base plate.

15. The system of claim 12 , wherein the base plate is configured in size and shape to extend along a portion of a length of a femur.

16. The system of claim 12 , wherein the attachment plate is a ring plate and the plate body is substantially circular and configured to extend over proximal end of a femur.

17. The system of claim 16 , wherein the ring plate includes a plurality of projections extending radially outward from the plate body, each of the projections including a bone fixation element receiving opening extending therethrough.

18. The system of claim 12 , wherein the base plate includes a plurality of bone fixation element receiving openings extending therethrough.

19. The system of claim 12 , wherein a proximal face of the engagement portion is configured to engage a correspondingly sized and shaped shoulder along the second surface of the connection portion, a gap between the proximal face of the engagement portion and the shoulder along the second surface of the connection portion decreasing as the ramped portion slides along the ramped face.

20. The system of claim 12 , wherein one of the c

Assignees

• Depuy Synthes Products Inc

Inventors

• Fatone Peter
• Dudé Stefan

Classifications

• A61B17/8061 Primary

  specially adapted for particular bones (A61B17/70 and A61B17/74 take precedence) · CPC title

• A61B17/1728

  for holes for bone plates or plate screws · CPC title

• A61B17/742

  having one or more longitudinal elements oriented along or parallel to the axis of the neck · CPC title

• A61B17/8052

  immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded · CPC title

• A61B17/8023

  Variable length plates adjustable in both directions · CPC title