News Column

Patent Issued for Intervertebral Disc Prosthesis

July 2, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Beaurain, Jacques (Saulon la Chapelle, FR); Fuentes, Jean-Marc (Grabels, FR); Vital, Jean-Marc (Bordeaux, FR); Dufout, Thierry (Oliver, FR); Huppert, Jean (L'Etrat, FR), filed on September 14, 2012, was published online on June 17, 2014.

The patent's assignee for patent number 8753397 is LDR Medical (Rosieres Pres Troyes, FR).

News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to an intervertebral disk prosthesis, intended to substitute the fibrocartilaginous disks joining the vertebrae in the spinal column, particularly on the cervical spine.

"Various types of prosthesis are known in the prior art. Some of these prostheses, either because they are made of compressible material or because they allow excessive movement of the different constituent parts of the prosthesis with respect to each other, may induce relatively easily the ejection of at least one part of the prosthesis outside the vertebrae, which is not desirable for the patient."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "The purpose of the present invention is to remedy some drawbacks of the prior art by proposing a simple intervertebral disk prosthesis which makes it possible to limit the movements of the different constituent parts of the prosthesis with respect to each other.

"This purpose is achieved by an intervertebral disk prosthesis comprising at least three parts including a first plate, referred to as the upper plate, a second plate, referred to as the lower plate, and a core, the upper surface of the core being in contact with at least part of the lower surface of the upper plate and the lower surface of the core being in contact with at least part of the upper surface of the lower plate, and the lower plate being movable at least with respect to the core, characterised in that there are cooperation means between the lower plate and the core, so as to limit or eliminate translation movements of the core with respect to the lower plate, along an axis substantially parallel to the lower plate, and to limit or eliminate rotation movements of the core with respect to the lower plate, around an axis substantially perpendicular to the lower plate, the planes passing through the upper and lower plates forming a substantially constant angle.

"According to another feature, the lower plate comprises male means cooperating with female means of the core.

"According to another feature, the lower plate comprises female means cooperating with male means of the core.

"According to another feature, the angle is obtained in that the core forms an acute angle in the front-rear direction.

"According to another feature, the same plates can be assembled with cores of different thicknesses.

"According to another feature, the angle between the upper and lower plates is between 0.degree. and 15.degree.

"According to another feature the core is movable with respect to the upper and/or lower plates, which makes it possible to compensate for positioning defects of the three parts of the prosthesis with respect to each other.

"According to another feature, at least part of the lower surface of the upper plate is concave and complementary to the upper surface of the core.

"According to another feature, the dimensions of each male means are slightly less than those of each female means so as to enable a slight clearance between the core and the lower plate.

"According to another feature, the dimensions of each male means are substantially the same as those of each female means so as to prevent any clearance between the core and the lower plate.

"According to another feature, the male means of the lower plate are two pins curved towards the inside of the prosthesis and located opposite each other on two edges of the prosthesis, and in that the female means of the core are two recesses.

"According to another feature, at least one of the pins is replaced by a lug equipped with a drilling whereon a tag is fixed using a dowel entering the drilling.

"According to another feature, the male means of the lower plate are two dowel pins located in the vicinity of the centre of the lower plate, and in that the female means of the core are two wells.

"According to another feature, the male means of the lower plate are two walls located opposite each other in the vicinity of two edges of the prosthesis, and in that the female means of the core are recesses.

"According to another feature, the male means of the lower plate are a rib located at the centre of the prosthesis, and in that the female means of the core are a groove.

"According to another feature, the core is made of polyethylene.

"According to another feature, the lower plate comprises one or more openings in the vicinity of its front side, provided to receive prosthesis anchoring means in a vertebra.

"According to another feature, the opening of the lower plate is rectangular, and in that the anchoring means consist of a body, forming an acute angle with the lower plate, and a head.

"According to another feature, the openings of the lower plate are circular, and in that the anchoring means are nail-shaped.

"According to another feature, the upper plate is convex on at least part of its upper surface to fit into the shape of the vertebrae.

"Other features and advantages of the present invention will be seen more clearly upon reading the description below, with reference to the appended figures, wherein:

"The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims."

For additional information on this patent, see: Beaurain, Jacques; Fuentes, Jean-Marc; Vital, Jean-Marc; Dufout, Thierry; Huppert, Jean. Intervertebral Disc Prosthesis. U.S. Patent Number 8753397, filed September 14, 2012, and published online on June 17, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8753397.PN.&OS=PN/8753397RS=PN/8753397

Keywords for this news article include: LDR Medical, Prosthetics, Medical Devices.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Journal of Engineering


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