Bone plate assembly with guide member

Patent metadata

Field	Value
Publication number	US-10258351-B2
Application number	US-201113267900-A
Country	US
Kind code	B2
Filing date	Oct 7, 2011
Priority date	Oct 7, 2010
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

A bone plate assembly is provided including a plate member with a top side ( 1 a ) and a bottom side ( 1 b ), at least one hole ( 2 ) extending from the top side ( 1 a ) to the bottom side ( 1 b ), an insert ( 3 ) arranged in the hole, the insert having a through hole ( 31 ), a guide member ( 4 ) removably arranged in the through hole of the insert, the guide member having a guide channel ( 40 ) and an outer surface portion ( 41 ) which engages an inner wall portion ( 32 ) of the through hole ( 31 ) to allow a pivoting movement of the guide member within the insert.

First claim

The invention claimed is:

1. A bone plate system, comprising:
a plate member with a top side, a bottom side and a first hole and a second hole each extending through the plate member from the top side to the bottom side, each of the first and second holes including an inner wall portion comprising an internal threaded portion, a seat portion between the internal threaded portion and the bottom side, the seat portion having a spherical-segment shape, and a diameter smaller than a smallest diameter of the internal threaded portion;
an insert configured to be arranged in each of the first hole and the second hole, the insert having a top side, a bottom side, a through hole and an inner wall portion defining at least a portion of the through hole of the insert, the insert further including a threaded outer surface portion configured to screw into the internal threaded portion, the threaded outer surface portion having a first end and a second end, wherein when the threaded outer surface portion is fully screwed into the internal threaded portion of the plate member with the second end directed towards the seat portion of the plate member, the top side of the insert is configured to be substantially flush with the top side of the plate member such that an entirety of the insert does not protrude above the top side of the plate member;
a guide member configured to be removably arranged in the through hole of the insert, the guide member comprising a guide channel and a spherical-segment shaped outer surface portion configured to engage the inner wall portion of the insert so as to allow a pivoting movement of the guide member when the guide member is arranged in the through hole of the insert, the guide member further comprising a shaft portion monolithic with and extending away from the spherical-segment shaped outer surface portion, the guide channel extending through the shaft portion;
a bone screw configured to be arranged in the seat portion in each of the first hole and the second hole, the bone screw comprising a head portion having a spherical-segment shape corresponding to the spherical-segment shape of the seat portion to engage the plate member in the seat portion to anchor the plate member to a bone, the spherical-segment shape of the head portion adapted to be substantially located below the top side of the plate member when the head portion of the bone screw is axially arranged in the seat portion; and
a locking member configured to screw into the internal threaded portion in each of the first hole and the second hole to lock the bone screw in the seat portion,
wherein the insert comprises a tapered recess between the top side of the insert and the inner wall portion, the tapered recess being increasingly larger in a direction toward the top side of the insert to provide space for movement of the shaft portion of the guide member in the tapered recess during the pivoting movement of the guide member when the guide member is arranged in the insert.

2. The bone plate system of claim 1 , wherein the shaft portion has a length such that the guide member projects out of the top side of the plate member when the guide member is arranged in the through hole of the insert and the insert is arranged in the first hole of the plate member.

3. The bone plate system of claim 1 , wherein the guide channel of the guide member has an inner diameter configured to allow a drill bit to pass through and/or to allow a guide wire or another guiding instrument to pass therethrough.

4. The bone plate system of claim 1 , further comprising a bushing removably connectable to the guide member and configured to reduce an internal diameter of the guide channel.

5. The bone plate system of claim 4 , wherein the bushing is insertable into the guide channel and has a stop to limit the insertion of the bushing relative to the guide member.

6. The bone plate system of claim 1 , wherein the spherical-segment shaped outer surface portion extends continuously from a bottom end of the guide member to the shaft portion along at least one side of the guide member.

7. The bone plate system of claim 1 , wherein a portion of the shaft portion is passable through the through hole of the insert such that when the portion of the shaft portion passes through the through hole of the insert, the spherical-segment shaped outer surface portion of the guide member is configured to rest against the inner wall portion of the insert.

8. The bone plate system of claim 1 , wherein the guide member is held by friction within the insert.

9. The bone plate system of claim 1 , wherein a largest width of the insert is not greater than a largest diameter of the first hole.

10. The bone plate system of claim 1 , wherein the tapered recess is configured to extend into the first hole when the guide member is arranged in the through hole of the insert and the insert is arranged in the first hole.

11. The bone plate system of claim 1 , wherein when the threaded outer surface portion of the insert is screwed into the internal threaded portion of the plate member with the second end of the insert directed towards the seat portion of the plate member, the first end of the threaded outer surface portion is configured to assume an axial position that is between the top side and the bottom side of the plate member.

12. The bone plate system of claim 1 , wherein the insert further comprises a spherical-segment shaped outer surface portion extending from the threaded outer surface portion, the spherical-segment shaped outer surface portion of the insert corresponding in size to the spherical-segment shape of the head portion of the bone screw and to the spherical-segment shape of the seat portion.

13. The bone plate system of claim 1 , further comprising a bushing with an inner channel, wherein the bushing is insertable at least partially into the guide channel of the guide member and removably connectable to a free end of the shaft portion of the guide member, such that the inner channel communicates with the guide channel and extends a length of the guide member.

14. The bone plate system of claim 1 , wherein a greatest width of an opening defined by the tapered recess at the top side of the insert is smaller than an outer width of the insert defined by a thread root of the threaded outer surface portion.

15. The bone plate system of claim 1 , wherein when the guide member is in the through hole of the insert and the insert is in the first hole of the plate member, the guide member is pivotable to a first position where the spherical-segment shaped outer surface portion of the guide member extends axially to the top side of the plate member, and to a second position where the spherical-segment shaped outer surface portion of the guide member extends axially to the bottom side of the plate member.

16. The system of claim 1 , wherein:
the insert is assembled in the first hole of the plate and the guide member is inserted into the through hole of the insert, such that the insert is interposed between the guide member and the seat portion of the first hole.

17. The system of claim 1 , wherein:
the insert has a hollow spherical-segment shaped portion having at least one slot to permit the spherical-segment shaped portion to flex in a radial direction, and the spherical-segment shaped portion of the insert extends to the bottom side of the plate member, and
when the spherical-segment shaped portion of the insert extends between the outer surface portion of the guide member and the seat portion of the one of the first and second holes of the plate, contact b

Assignees

• Biedermann Markku
• Biedermann Technologies Gmbh

Inventors

• Biedermann Markku

Classifications

• A61B17/1757

  for the spine · CPC title

• A61B17/8057

  the interlocking form comprising a thread · CPC title

• A61B17/1728 Primary

  for holes for bone plates or plate screws · CPC title

• A61B17/86

  Pins or screws {or threaded wires; nuts therefor (A61B17/72 take precedence)} · CPC title

• A61B17/80 Primary

  Cortical plates {, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates} · CPC title