FR2466982A1 - RAW MATERIAL USED IN MEDICAL TECHNOLOGY FOR BONE PROSTHESES - Google Patents

Abstract

at. Raw material for bone prostheses, consisting of a core of a thermosetting resin reinforced with fibers, serving as a carrier element, provided with a surface layer, reinforced with fibers, which is compatible with the human body without risk of rejection. b. Material characterized in that the core and the surface layer are both made of triazine resin. vs. Raw material applicable to the manufacture of internal prostheses or implantable joining elements.

Description

The invention relates to a raw material for

  bone prostheses, consisting of a core of a thermosetting resin

  hardenable reinforced with fibers, serving as a carrier

  it has a surface layer reinforced with fibers that is compatible with the human body, without the risk of reexamination. He knows! to use as human subztitlt povi, for example for the lartioxation of han han: e metallalloy alloys o. and a combination of cos,% ts1 a: e o Don a

  already proposed to this eOffLe, nsemb! es in ta2 !. and re-pleas-

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  2.- Pure plastics have a resistance

  too low for traction, bending, alternating flexion

  and creep so that they can be implemented in

use cases considered here.

  Also known is a raw material which is constituted by a fiber-reinforced core of heat-hardenable material, serving as a carrier element, and having a surface coating compatible with the body, this coating

  surface made of polyethylene or a thermo-

  considered as plastic material until now

  that is the most compatible with the body. All special-

  With regard to the insertion behavior in the tissues, it is found that if polyethylene is used as a surface layer on a material or piece of this kind, a layer of more or less strong connective tissue that must be considered as being the origin

  additional detachment of the implant.

  The purpose of the i.aventibn is a raw material, characterized in that the core and the surface layer consist of all the demuxes made of triazine resin.

  This subject has, compared to the preceding

  the advantage of not showing up after a period of

  planting twelve months, yet no adverse effect with regard to compatibility with the body. Above all, there was a total growth of bone tissue on the implant without intermediate layer. In addition, the triazine resin can be reinforced with carbon fibers, so that a very strong material can be produced but which, however,

  can vary the resistance. pela makes it possible to adapt the confi-

  endoprosthesis, particularly stents for

  the articulation of the exchange, according to bio-

  mechanical, that is to say to adapt the rigidity of the prosthesis

  the rigidity of the bone and the configuration of the whole

  so that it does not occur in the remaining bones,

  This is a harmful tension that could lead to bone degradation. Triazine resins which are identical to cyanate resins have already been used as a carrier core in the fiber-reinforced form mentioned above. There was, however, a general feeling among the competent persons that this resin belonging to the class of thermosetting materials did not have sufficient compatibility with the body, since thermosetting materials could still emit substances which would lead to deficiency of compatibility with the body. We have been

  surprised that this prejudice against thermosetting

  in general, and triazines in particular, which was generally

  generally accepted, is not exact, and that especially the resin of

  triazine reinforced with carbon fibers has much more

  t8t an exceptional compatability with the human body Taking different measures described more

  far, the above-mentioned materials can be

  It is particularly advantageous to reinforce the triazine resin with webs of carbon fibers in which the fibers have different orientations. This makes it possible to adapt remarkably

  the mechanical properties of the material to the properties of the bones.

  The reinforcing fibers will consist of carbon or other high-strength substances, and will be in the form of webs. However, the fibers may be used in the form of a combination of fibers.

long and flat fibers.

  the invention will be better understood with regard to the

  description below of an embodiment of the invention,

  given only as an example.

  A sheet of carbon fibers is impregnated in which the fibers are oriented in various directions with a liquid triazine resin, for example the triazine A of the

  Pirma Bayer A.G., dissolved in acetone (70% by weight of

  sine and 30% by weight of acetone) o The impregnated sheet is rolled on the ellemome and shaped so that it roughly takes the contours of the molded pibe that is sought

  to obtain. This preformed part is then placed in a mold.

  For example, it should be noted here that the total volume of the pre-formed part is a little larger than the width of the mold completely closed and that the mold has at least one opening per oh. Resin texcès when we tie together the two parts of the mold. The mold containing the premolded part is then heated to about 1600 ° C., and the two halves of the mold are pressed one on top of the other. After cooling, the triazine resin is hardened

  so that after removal of the mold part, the mold part

  is in the form of a coherent stratified

  the surface of which, as well as the core, consists of triazine resin reinforced with carbon fibers. The material has a flexural strength of more than 600 N / mm 2 and a modulus of elasticity of 50,000 to 100,000 N / mm 2. By varying the length of the fibers and their orientation in the plies, it is possible to a large extent these properties

to the properties of the bones.

 -

Claims (4)

CLAIMS I   1.- Raw material for bone prostheses, consisting of a thermosetting resin core reinforced with   fibers, serving as a carrier element, provided with a superstrate   perfective, reinforced with fibers, which is compatible with the human body without risk of rejects marière characterized in that the core and the surface layer are both made of triazine resin 2.- Raw material according to claim 1, characterized in that the fibers have carbon fibrils or   other substances with resistance resistance having the elastic modulus high city.   3. Material according to claim 2, characterized   rised in that the fibers have. In the form of tablecloths.   4.- Matter.e LsLveAt ls claim 2o features   in that the fibers are used in the form of a combination of webs and fibers   5.- Subsequent Matter of Claims 3   and 4, characterized in that leis ibes are present in the nap-   various orientationsSo -Matir e prea: i sui t lne queilonque   of the claims 1 è 52 cazaosrs see e O! _% u! the is put in   It is used for the manufacture of a particular body of stents. 7. Substances following the name of the person   claims 1 to 6 c e-n that: it is the 1base   implantable abutment or junction elements with eG resins triazine.