Osseous anchoring implant with a polyaxial head and method for installing the implant

Patent metadata

Field	Value
Publication number	US-10098668-B2
Application number	US-201414497321-A
Country	US
Kind code	B2
Filing date	Sep 26, 2014
Priority date	Sep 1, 2003
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

An osseous anchoring implant, various embodiments of which comprise an osseous anchor and a head bearing fixation structure capable of receiving and fixing at least one bar, the head of the implant being traversed by at least one duct, which receives the bar through a lateral aperture, and by a threaded channel, whose axis is not parallel to the axis of the duct, which receives a fixation screw of the bar, the implant being characterized in that it comprises fixation structure of the head on the part of the implant which extends from the osseous anchor, these fixation structures allowing, prior to blocking and fixing, at least a determined mobility of the head around at least one axis not parallel to the axis of symmetry of the osseous anchor. The fixation screw of the bar may comprise a ball and socket at its base.

First claim

The invention claimed is:

1. An osseous anchoring implant comprising:
a body comprising an osseous anchor with an anchor axis at a first end of the body, a threaded cylindrical part disposed at a second end of the body at the opposite end of the anchor axis from the first end of the body, and a tapered part integral with the body disposed between the osseous anchor and the threaded cylindrical part;
a fixation olive having a tapered internal wall configured to rest on the tapered part of the body; and
a head comprising
a duct having a duct axis and a lateral aperture configured to receive an osteosynthesis bar via a side of the duct, the duct having ends separated along the duct axis and a center disposed along the duct axis between the ends of the duct, with the duct having internal diameters at the ends that are greater than an internal diameter of the duct at the center,
a threaded fixation screw comprising a ball and socket disposed at an end of the fixation screw,
a threaded channel having a channel opening into the duct and a channel axis not parallel to the duct axis, the treaded channel being configured to hold the fixation screw with the ball and socket at least partially disposed in the duct,
a mobile base disposed in the duct opposite the channel opening, the mobile base having a support face in the form of cylinder portion protruding at least partially into the duct, and
a fixation ring configured to receive the fixation olive and mount the head to the body;

the osseous anchoring implant having
an installation configuration in which the fixation olive is threaded onto the threaded cylindrical part and disposed at a first distance from the second end of the body, and
an installed configuration in which the tapered internal wall of the fixation olive is in contact with the tapered part of the body and the fixation olive is disposed at a second distance from the second end of the body, with the first distance less than the second distance.

2. The osseous anchoring implant of claim 1 further comprising a osteosynthesis bar having a length and a flat surface extending along the length.

3. The osseous anchoring implant of claim 1 , in which the fixation ring is integral with the head and disposed on an opposite side of the head from the duct, the fixation olive is sectioned along its entire height, and the cylindrical part of the body is threaded.

4. The osseous anchoring implant of claim 2 in which the flat surface extending along the length of the osteosynthesis bar does not extend to at least one end of the osteosynthesis bar.

5. The osseous anchoring implant of claim 3 , further comprising a nut comprising a threaded bore co-operative with the threaded cylindrical part of the body to press the fixation olive against the tapered part of the body when the nut is tightened.

6. The osseous anchoring implant of claim 5 , in which the nut has flats co-operative with a tool adapted to screw the nut.

7. The osseous anchoring implant of claim 1 , in which the osseous anchor is a hook.

8. The osseous anchoring implant of claim 1 , in which the osseous anchor is threaded.

9. The osseous anchoring implant of claim 8 , in which an end of the extending part of the body has a recess configured to co-operate with a tool for rotating the body.

10. The osseous anchoring implant of claim 1 , in which the ball and socket comprises a flat base.

11. The osseous anchoring implant of claim 10 , in which the flat base of the ball and socket is disposed on a disc.

12. The osseous anchoring implant of claim 4 in which the ball and socket comprises a flat base and the osteosynthesis bar comprises a surface forming a cylinder portion extending along the length of the osteosynthesis bar, and the osseous anchoring implant has a configuration in which the osteosynthesis bar is fixed in the duct with:
the flat base of the ball and socket fixed by the threaded fixation screw against the flat surface extending along the length of the osteosynthesis bar,
a portion of the surface of the osteosynthesis bar forming a cylinder portion fixed against the support face of the mobile base, and
the length of the osteosynthesis bar oriented in the duct at an angle with the duct axis.

13. The osseous anchoring implant of claim 1 , in which the mobile base has irregularities in its shape, co-operative with irregularities in the housing formed in the duct to restrict the movement of the mobile base in the housing.

14. An osseous anchoring system comprising:
an implant comprising
a body comprising an osseous anchor disposed at a first end of the body, a threaded cylindrical part disposed at a second end of the body, and a seat disposed between the osseous anchor and the threaded cylindrical part,
a fixation olive comprising an internal wall, and
a head comprising
a duct having a duct axis and a lateral aperture configured to receive an osteosynthesis bar via a side of the duct, the duct having ends separated along the duct axis and a center disposed along the duct axis between the ends of the duct, with the duct having internal diameters at the ends of the duct that are greater than an internal diameter of the duct at the center, the duct comprising first and second walls that taper from the ends of the duct toward the center of the duct and join at a third wall disposed in the center of the duct,
a threaded fixation screw comprising a ball and socket disposed at an end of the fixation screw, the fixation screw being translatable in a channel having an opening in duct that is on an opposite side of the duct from the third wall of the duct, and
a fixation ring configured to receive the fixation olive and mount the head to the body; and

a bar, the bar having a blocked configuration in which the bar is blocked in the duct with a first side of the bar pressed against the ball and socket and with a second side of the bar opposite the first side of the bar pressed against one of the first, second, and third walls of the duct, with
the osseous anchoring system having
an installation configuration in which the fixation olive is threaded onto the threaded cylindrical part and disposed at a first distance from the second end of the body, and
an installed configuration in which the internal wall of the fixation olive is in contact with the seat and the fixation olive is disposed at a second distance from the second end of the body, with the first distance less than the second distance.

Assignees

• Ldr Medical

Inventors

• Renaud Christian
• Castera Gerard

Classifications

• A61B17/7034 Primary

  characterised by a lateral opening · CPC title

• A61B17/7041

  with single longitudinal rod offset laterally from single row of screws or hooks (A61B17/7044 takes precedence) · CPC title

• A61B17/7035 Primary

  Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other · CPC title

• A61F2/44

  for the spine, e.g. vertebrae, spinal discs · CPC title

• A61B17/70 Primary

  Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant · CPC title