Vertebral osteosynthesis equipment

Patent metadata

Field	Value
Publication number	US-2017172631-A1
Application number	US-201515289702-A
Country	US
Kind code	A1
Filing date	Apr 17, 2015
Priority date	Apr 17, 2014
Publication date	Jun 22, 2017
Grant date	—

Abstract

At least one connection assembly which this equipment comprises includes a connection piece of open type and a mating component piece positioned one with respect to the other by positioning means. According some disclosed embodiments, the said positioning means include: the hole in the said connection piece; a portion of the said piece, dimensioned so as to be engaged in the interior of this hole in a fit adjusted manner and so as to be slidable in this hole; and the said connection assembly comprises: assembly means for assembling of the connection piece to the mating component piece, and maintaining means for maintaining in place the said mating component piece in the said separated apart position, based on a force that is less than the clamping force exerted by a nut to be screwed on to the proximal threaded pin of an anchoring member.

First claim

What is claimed is:

1 . Vertebral osteosynthesis equipment, including:
at least one rigid rod intended to be extending along several vertebrae, and in general two rods intended to be placed on either side of the spinous processes of the vertebrae; bone anchoring members, such as pedicular screws or laminar hooks, intended for anchoring the said rod to the vertebrae to be treated; at least one bone anchoring member has a proximal threaded pin and a support surface; connection assemblies to be used for connecting the rod to the bone anchoring members; at least one connection assembly includes a connection piece of “open” type, that is to say, having a curved portion that delimits a receiving channel for receiving the rod and which is adapted to only partially enclose the rod, and a mating component piece that is movable relative to this said connection piece; the mating component piece is movable between a separated apart position relative to the said curved portion, in which it does not hinder the transverse engagement of the rod in the receiving channel, and a closer position relative to the said curved portion, in which the mating component piece closes the receiving channel and retains the rod in this channel; the connection piece and the mating component piece are provided with holes for engagement thereof on to the said proximal threaded pin and comprise positioning means to ensure their proper positioning in relation to one another in a mounting position in which these holes come to be coincident with each other; and at least one nut intended to be screwed on to the said proximal threaded pin so as to clamp the connection piece and the mating component piece between itself and the said support surface and to thereby bring the connection piece and the mating component piece into the said closer position, the said positioning means include:
the hole in the said connection piece;
a portion of the said mating component piece, dimensioned so as to be engaged in the interior of this hole in a fit adjusted manner and so as to be slidable in this hole;
and the said connection assembly comprises:
assembly means for assembling of the connection piece to the mating component piece, thereby causing the connection assembly to have a unitary structure, and
maintaining means for maintaining in place the said mating component piece in the said separated apart position, allowing for the maintaining in place of this mating component piece relative to the connection piece, this maintaining in place being brought about based on a force that is less than the clamping force exerted by the nut during the screwing of this nut on to the said proximal threaded pin.

2 . Equipment according to claim 1 , characterized in that the said assembling means and the said maintaining means are formed by the respective engagement portions of the connection piece and of the said portion of the mating component piece brought into engagement with one another, which are capable of being brought out of engagement when the said nut is screwed on.

3 . Equipment according to claim 2 , characterized in that the said assembling means and the said maintaining means comprise a collar flange formed on to one among the connection piece and the mating component piece and by a groove provided in the other piece, the collar flange being capable of being positioned and retained in the groove in the absence of the clamping force exerted by the nut, and being capable of being extracted from this said groove during the screwing of the nut.

4 . Equipment according to claim 3 , characterized in that:
the said groove is formed in the connection piece, and the said portion of the mating component piece is formed by a series of snapping teeth disposed in a circle, forming together, externally, the said collar flange, the said teeth being resiliently movable between a radially outer position, in which the said collar flange is capable of being engaged in the said groove, and a radially inner position, in which the said teeth are deflected in a manner so as not to be an impediment to the sliding of the mating component piece in the hole that includes the connection piece.

5 . Equipment according to claim 2 , characterized in that:
one piece among the connection piece and the mating component piece has an elongated aperture formed parallel to the direction of movement of these pieces during their passage from the said separated apart position to the said closer position; this elongated aperture is delimited by longitudinal edges and at least one of the longitudinal edges has a protuberance projecting out towards the interior of the elongated aperture; this protuberance subdivides the elongated aperture into a hold maintaining housing and a sliding portion; the other piece among the connection piece and the mating component piece includes a pin engaged through the elongated aperture and capable of sliding into the latter from the hold maintaining housing up to the sliding portion, by crossing over by force the said protuberance during this sliding.

6 . Equipment according to claim 5 , characterized in that the two longitudinal edges delimiting the elongated aperture each have a protuberance and the two protuberances are located so as to be facing one another.

7 . Equipment according to claim 6 , characterized in that the two longitudinal edges delimiting the elongated aperture each have two protuberances and each protuberance is located so as to be facing a protuberance situated on the opposite edge, the two pairs of protuberances delimiting an intermediate hold maintaining zone, thus making it possible to maintain the pin in place therein, and therefore to maintain the connection piece and the mating component piece in an intermediate position between the separated apart position and the closer position mentioned above.

8 . Equipment according to claim 5 , characterized in that the hold maintaining housing is fit adjusted to the pin in a manner so as to keep this pin immovable within it, and therefore to keep the mating component piece immovable relative to the connection piece.

9 . Equipment according to claim 1 , characterized in that the mating component piece and the connection piece form stop surfaces which precisely determine the said closer position of these two pieces.

10 . Equipment according to claim 1 , characterized in that the mating component piece forms a lateral extension that makes it possible to close the receiving channel for receiving the rod and this lateral extension has a cavity in the form of a portion of a hollow cylinder formed on it.

Assignees

• Medicrea Int

Inventors

• Mosnier Thomas
• Ryan David

Classifications

• A61B17/7043

  with a longitudinal element fixed to one or more transverse elements which connect multiple screws or hooks · CPC title

• A61B17/7056

  Hooks with specially-designed bone-contacting part · CPC title

• A61B17/7041 Primary

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

• A61B17/8665

  Nuts · CPC title