Multi-axial orthopedic device and system

Patent metadata

Field	Value
Publication number	US-9610105-B2
Application number	US-201113236383-A
Country	US
Kind code	B2
Filing date	Sep 19, 2011
Priority date	Aug 20, 2003
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

Embodiments of an orthopedic implant device and system, and methods for implanting them, are disclosed. The implant may include a receiver member having a channel for accommodating an elongated rod or other longitudinal member, a bone anchoring member such as a screw or hook, and a base member rotatable with respect to the receiver member for retaining the bone anchoring member in the receiver member. The base member is configured to allow at least two different degrees of maximum angulation of the bone anchoring member with respect to the receiver member. The number and relative direction of such angulations are independent of the orientation of the channel or other part of the receiving member.

First claim

What is claimed is:

1. A bone fixation system, comprising:
a receiver member having a longitudinal axis and an external bottom surface, said receiver member including an outer surface defining a first groove;
a bone anchoring member having a head portion and a bone-engaging portion;
a base member comprising an upper surface engaging said bottom surface to rotatably connect said base member to said receiver member adjacent to said bone anchoring member, said base member including an inner surface defining a second groove, said base member having at least one wall defining a surface that engages said head portion of said bone anchoring member, said wall located below said external bottom surface of said receiver;
a crown element comprising an undersurface that engages said head portion and an upper surface that engages a transverse flange defined by an inner surface of said receiver member; and
a ring member occupying at least a portion of said first and second grooves to hold the receiver member and the base member together.

2. The system of claim 1 , wherein said wall of said base member further comprises an opening configured to receive a portion of said bone anchoring member such that said bone anchoring member has a greater maximum angle to said longitudinal axis when said bone anchoring member is positioned in a first position of said opening relative to an angle measured between said bone anchoring member and said longitudinal axis when said bone anchoring member is positioned in a second position at a second maximum angle within said opening.

3. The system of claim 2 , wherein said wall of said base member is substantially in the form of a C-shaped member defining a gap extending through proximal and distal end surfaces of said base member.

4. The system of claim 1 , wherein said receiver member comprises a threaded portion configured to engage threads of a compression member.

5. The system of claim 1 , wherein said upper surface extends transverse to said longitudinal axis.

6. The system of claim 1 , wherein said crown element is prevented from moving proximally along said longitudinal axis by said transverse flange.

7. A bone fixation system, comprising:
a receiver member having at least one wall defining a channel for receiving at least a portion of an elongated body and a first groove extending around a longitudinal axis of said receiver, said receiver member including a side surface having an aperture;
a bone anchoring member having a head portion and a bone-engaging portion, said bone anchoring member having at least a first maximum angular position and a second maximum angular position relative to said receiver member, wherein said second maximum angular position includes a greater angle relative to said receiver member than said first maximum angular position;
a base member insertable into said receiver member through said aperture, said base member being rotatably connected to said receiver member, said base member having at least one wall defining an opening that allows said bone anchoring member to occupy either of said first maximum angular position and said second maximum angular position, said at least one wall of said base member being substantially in the form of a C-shaped ring and having a second groove extending around a longitudinal axis of the base member; and
a crown element comprising an undersurface that engages said head portion and an upper surface that engages a transverse flange defined by an inner surface of said receiver member.

8. The system of claim 7 further comprising one or more implants from the group consisting of cross connectors, lateral connectors, monoaxial bone anchoring members, multi-axial bone anchoring members, plate members, and occipital fixators.

9. The system of claim 7 , wherein said elongated member is a spinal rod.

10. The system of claim 9 , wherein said elongated member is a spinal rod having a substantially constant diameter.

11. The system of claim 9 , wherein said elongated member is a spinal rod having a first portion with a first substantially constant diameter and a second portion with a second substantially constant diameter that is larger than said first diameter.

12. An orthopedic implant apparatus comprising:
a receiver member having at least one wall including an inner surface defining a channel for receiving at least a portion of an elongated body and an outer surface including a groove, said receiver member having a longitudinal axis and a bottom surface defining a bottom receiver plane;
a bone anchoring member having a head portion and a bone-engaging portion;
a base member rotatably connected to said receiver member including a first surface that engages said bottom surface and an inwardly facing flange disposed in said groove; and
a crown element comprising an undersurface that engages said head portion and an upper surface that engages a transverse flange defined by said inner surface,
wherein said base member permits multi-axial positioning of said bone anchoring member with respect to said receiver member, said base member and said bone anchoring member having a first relative position wherein the maximum angle between said bone anchoring member and said axis is a first value, and wherein other relative positions of said base member and said bone attachment member allow a maximum angle between said bone anchoring member and said axis that is less than said first value, and said first relative position is independent of the orientation of said channel of said receiver member, said base member having a wall configured to engage said head portion of said bone anchoring member, said base wall defining a base plane, said base plane extending below said bottom receiver plane.

13. The apparatus of claim 12 , wherein said base member has a lower surface that is non-perpendicular to said axis when said base member is connected to said receiver member.

14. The apparatus of claim 12 , wherein said base member has a side wall with a notch, and wherein in said first relative position at least a portion of said bone anchoring member is substantially aligned with at least a portion of said notch.

15. The apparatus of claim 12 , wherein said wall of said base member includes an inner surface defining an opening configured for disposal of said head portion, said inner surface of said base member including an inward facing notch extending perpendicular to said longitudinal axis that engages said head portion.

16. The system of claim 12 , wherein said receiver member comprises a threaded portion configured to engage threads of a compression member.

17. The system of claim 12 , wherein said first surface extends transverse to said longitudinal axis.

Assignees

• Farris Robert A
• Poyner Jeffrey W
• Warsaw Orthopedic Inc

Inventors

• Farris Robert A
• Poyner Jeffrey W

Classifications

• A61B17/7037 Primary

  wherein pivoting is blocked when the rod is clamped · CPC title

• A61B2090/035

  preventing further rotation · CPC title

• A61B17/7049

  Connectors, not bearing on the vertebrae, for linking longitudinal elements together (A61B17/7055, A61B17/7053, A61B17/7019 take precedence) · CPC title

• A61B17/7032

  Screws or hooks with U-shaped head or back through which longitudinal rods pass · CPC title

• A61B17/7038

  to a different extent in different directions, e.g. within one plane only · CPC title