| Method for restoration of human or animal bone anatomy, and expansible prosthetic implant allowing implementation of this method -> Monitor Keywords |
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Method for restoration of human or animal bone anatomy, and expansible prosthetic implant allowing implementation of this methodRelated Patent Categories: Prosthesis (i.e., Artificial Body Members), Parts Thereof, Or Aids And Accessories Therefor, Implantable Prosthesis, Bone, AdjustableMethod for restoration of human or animal bone anatomy, and expansible prosthetic implant allowing implementation of this method description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20050278036, Method for restoration of human or animal bone anatomy, and expansible prosthetic implant allowing implementation of this method. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The present invention relates to the field of surgery, and prosthetic implants, more particularly to methods for restoration of human or animal bone anatomy, and to prosthetic bone implants. [0002] Various causes can be at the root of bone compression, in particular osteoporosis which causes for example natural vertebral compression under the weight of the individual, but also traumas, occasionally the two causes being combined. These bone compressions can essentially affect the vertebrae but also concern other bones, such as the radius or the femur for example. [0003] Several vertebroplasty techniques are known for effecting a vertebral correction i.e. to make a vertebra re-adopt its shape or initial anatomy, or a shape similar to the latter, as closely as possible. [0004] A technique is known for example comprising introduction of an inflatable balloon into a vertebra, then introducing a fluid under pressure into the balloon placed in the vertebra in order to force the cortical shell of the vertebra, and in particular the lower and upper vertebral plateaus, to re-adopt a corrected shape under the effect of the pressure. This technique is known by the name of kyphoplasty. Once the osseous cortical shell has been corrected, the balloon is then deflated, then withdrawn from the vertebra in order to be able to inject a cement into the latter which is intended to impart, to the corrected vertebra, sufficient mechanical resistance for the correction to have a significant duration in time. A notable disadvantage of such a method resides in its numerous manipulations, in particular inflation, and in the necessity to withdraw the balloon from the patient's body. Furthermore the expansion of a balloon is relatively poorly controlled because it has a volume, i.e. multi-directional; now it can be clearly prejudicial to the operation and therefore to the patient to exert a large pressure in unsuitable directions which might involve the risk of bursting of the cortical, in particular the lateral part of the latter connecting the lower and upper plateaus of a vertebra. [0005] Vertebral implants exist furthermore which are intended to fill a cavity in a vertebra, but the latter adopt a radial expansion principle obtained by formation of a plurality of points which stand normally to the longitudinal axis of the implant under the effect of contraction of the latter. Such implants impose too high a pressure on the end of the points which is capable of piercing the material on which the points are supported. Furthermore, this very high pressure can cause bursting of the tissues or organ walls, such as a bone cortical for example. For this reason, these implants have the function of filling an already formed cavity because they cannot form a cavity and are use surrounded by a stitch, tissue or a balloon which makes their use all the more complicated. Furthermore, the radial expansion of such implants does not allow a particular expansion direction to be favoured. [0006] The present invention allows these disadvantages to be reduced and other advantages to be provided. More precisely, it comprises a method for restoration of human or animal bone anatomy, characterised in that it comprises the following steps: [0007] introduction, into a bone, the shape of which is to be restored, of an expansible implant according to a single determined plane intrinsic to said implant, [0008] positioning said expansible implant in said bone in order to make said expansion plane intrinsic to said implant correspond with a bone restoration plane, [0009] opening out said expansible implant in said bone restoration plane with a view to forming a cavity inside said bone, [0010] injecting a filling material into said cavity containing said implant with a view to filling the latter. [0011] The method according to the invention allows an intra-osseous cavity to be created thanks to the expansion of the implant, using a favoured expansion direction. The filling material can be injected with a relatively low pressure thanks to the implant which remains in place, which allowed the creation of a distinct precise cavity, and the preservation of the dimensions of the thus created cavity. [0012] According to an advantageous feature, the method according to the invention comprises opening out said expansible implant in said bone restoration plane, by a determined value between a minimum thickness of the implant before any expansion of the latter and a maximum thickness of the implant after its maximum expansion. [0013] This feature allows the expansion value of the implant to be controlled, for example with a view to a given vertebral correction. [0014] According to an advantageous feature, the step comprising opening out said expansible implant comprises opening out a first and a second opposite plate, forming respectively a first and a second support surface in said bone. [0015] This feature allows the pressure which is exerted by the implant on the tissues in contact with the latter to be reduced, by increasing the contact or support surface on said tissues, and allows the latter to be spread more easily with a view to forming the cavity without piercing them. [0016] According to an advantageous feature, said first and second support surfaces in said bone have respectively a length which is substantially equal to the length of said implant. [0017] This feature allows optimisation of the ratio of the support length on the tissues to the length of the implant. The closer this ratio is to one, the more the implant will be usable in places of a small length with a view to creating the most precise cavity possible. One advantage of the implant according to the invention is to allow the creation of the largest possible cavity for a given implant length in order to allow a bone correction in tiny parts of a bone, and in order to allow the introduction of a filling material according to the lowest possible injection pressure with a view to avoiding infiltration of the filling material into inappropriate tissues such as blood vessel walls for example. [0018] According to an advantageous feature, said first and second plates form first and second support surfaces which are continuous over their length respectively. [0019] This feature, because of the continuity of the support surfaces, allows a contribution to reducing the pressure on the retracted tissues, and to the creation of a cavity, the contours of which are continuous, making its contribution therefore to reducing the injection pressure of the filling material. [0020] According to an advantageous feature, said first and second plates form respectively continuous smooth support surfaces. [0021] According to an advantageous feature, said first and second plates form respectively partially cylindrical support surfaces, one generator of which is parallel to a longitudinal axis of said expansible implant. [0022] According to an advantageous feature, the step comprising opening out said first and second plates comprises raising the latter by support under the plates. [0023] This feature allows the ratio corresponding to the length of the support surfaces to the length of the implant to be increased and to make it tend towards one, as will be explained in more detail further on with the description of an embodiment of the invention. Furthermore, this feature allows the thrust forces to be distributed under the plate in order to reduce the cantilever. [0024] According to an advantageous feature, the step comprising injecting a filling material into said cavity containing said implant with a view to filling the latter comprises injecting an ionic cement, in particular a phosphocalcic cement, an acrylic cement or a compound of the latter. Continue reading about Method for restoration of human or animal bone anatomy, and expansible prosthetic implant allowing implementation of this method... Full patent description for Method for restoration of human or animal bone anatomy, and expansible prosthetic implant allowing implementation of this method Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Method for restoration of human or animal bone anatomy, and expansible prosthetic implant allowing implementation of this method patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. 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