Vertebral osteosynthesis equipment

Patent metadata

Field	Value
Publication number	US-10624677-B2
Application number	US-201515289702-A
Country	US
Kind code	B2
Filing date	Apr 17, 2015
Priority date	Apr 17, 2014
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

Vertebral osteosynthesis equipment is disclosed, including a connection assembly with a connection piece of open type and a mating component piece positioned one with respect to the other. The connection piece includes a hole, where the mating piece is dimensioned to be engaged in the interior of the hole in a fit adjusted manner and is slidable within the hole. The connection piece is assembled to the mating component piece in separated apart position based on a force that is less than a clamping force exerted by a nut to be screwed on to a proximal threaded pin of an anchoring member that can be tightened so as to bring the connection piece and the mating component piece in a close position.

First claim

What is claimed is:

1. Vertebral osteosynthesis equipment, including:
at least one rigid rod intended to be extending along several vertebrae;
bone anchoring members intended for anchoring the at least one rigid rod to the vertebrae to be treated wherein at least one of the bone anchoring members has a proximal threaded pin and a support surface;
connection assemblies to be used for connecting the at least one rigid rod to the bone anchoring members, wherein at least one connection assembly includes a connection piece of “open” type having a curved portion that delimits a receiving channel for receiving the at least one rigid rod and which is adapted to only partially enclose the at least one rigid rod, and a mating component piece that is movable relative to the connection piece, wherein the mating component piece is movable between a separated apart position relative to the curved portion, in which it does not hinder the transverse engagement of the at least one rigid rod in the receiving channel, and a closer position relative to the curved portion, in which the mating component piece closes the receiving channel and retains the at least one rigid rod in the channel; wherein the connection piece and the mating component piece are each provided with a hole for engagement thereof onto the proximal threaded pin and comprise an assembly means to ensure proper positioning in relation to one another in a mounting position in which the holes come to be coincident with each other; and
at least one nut intended to be screwed on to the proximal threaded pin so as to clamp the connection piece and the mating component piece between the at least one nut and the support surface and to thereby bring the connection piece and the mating component piece into the closer position, wherein said assembly means include:
an engagement portion of the mating component piece, dimensioned so as to be engaged in the interior of the hole of the connection piece in a fit adjusted manner and so as to be slidable in the hole of the connection piece; and

the connection assembly comprises:
a maintaining means for maintaining in place the mating component piece in the separated apart position, formed by engaging parts of the connection piece and of the mating component piece, allowing for the maintaining in place of the mating component piece relative to the connection piece, the maintaining in place being brought about based on a force that is less than the clamping force exerted by the at least one nut during the screwing of the at least one nut on to the proximal threaded pin, such that the engaging parts forming said maintaining means are capable of being brought out of engagement when the at least one nut is screwed on.

2. Equipment according to claim 1 , characterized in that the engaging parts comprise a collar flange formed on the mating component piece and by a groove provided in the connection piece, the collar flange being capable of being positioned and retained in the groove in the absence of the clamping force exerted by the one nut, and being capable of being extracted from the groove during the screwing of the one nut.

3. Equipment according to claim 2 , characterized in that:
the engagement portion of the mating component piece is formed by a series of snapping teeth disposed in a circle, forming together, externally, the collar flange, the teeth being resiliently movable between a radially outer position, in which the collar flange is capable of being engaged in the groove, and a radially inner position, in which the teeth are deflected in a manner so as not to be an impediment to the sliding of the mating component piece in the hole formed in the engagement portion of the connection piece.

4. Equipment according to claim 1 , characterized in that the maintaining means comprise:
an elongated aperture formed in the connection piece, the elongated aperture being formed parallel to the direction of movement of the connection piece and the mating component piece during passage of the connection piece and the mating component piece from the separated apart position to the closer position; the elongated aperture is delimited by two longitudinal edges and at least one of the longitudinal edges has a protuberance projecting out towards the interior of the elongated aperture; the protuberance subdivides the elongated aperture into a hold maintaining housing and a sliding portion;
a pin included in the mating component piece, the pin being 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 protuberance during the sliding.

5. Equipment according to claim 4 , characterized in that each of the two longitudinal edges delimiting the elongated aperture has two protuberances and the two protuberances are located so as to be facing one another.

6. Equipment according to claim 5 , characterized in that each of the two protuberances is located so as to be facing a protuberance situated on the opposite edge, and each protuberance is formed by 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.

7. Equipment according to claim 4 , characterized in that the hold maintaining housing is fit adjusted to the pin in a manner so as to keep the pin immovable within it, and therefore to keep the mating component piece immovable relative to the connection piece.

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

9. 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 at least one rigid rod and the lateral extension has a cavity in the form of a portion of a hollow cylinder formed on it.

10. Equipment according to claim 1 , characterized in that the equipment includes two rigid rods intended to be placed on either side of the spinous processes of the vertebrae.

11. Equipment according to claim 1 , characterized in that the bone anchoring members are at least one of: pedicular screws and laminar hooks.

Assignees

• Medicrea Int

Inventors

• Mosnier Thomas
• Ryan David

Classifications

• 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

• A61B17/7056

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

• A61B17/7043

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