Method for restoration of human or animal bone anatomy, and expansible prosthetic implant allowing implementation of this method

Abstract

A method for restoration of human or animal bone anatomy includes introduction into a bone of an expansible implant according to a single determined plane intrinsic to the implant, positioning the expansible implant in the bone in order to make the expansion plane intrinsic to the implant correspond with a bone restoration plane, opening out the implant in the bone restoration plane with a view to forming a cavity inside the bone, and injecting a filling material into the cavity containing the implant. The implant includes a single determined expansion plane intrinsic to the implant, a device for positioning the implant in the bone, and a device for opening out the implant in the expansion plane.

1 . Method for restoration of human or animal bone anatomy, characterised in that it comprises the following steps: 
 introduction, into a bone ( 60 ), the shape of which is to be restored, of an expansible implant ( 1 ,  101 ) according to a single determined plane ( 2 ,  102 ) intrinsic to said implant,    positioning said expansible implant in said bone in order to make said expansion plane intrinsic to said implant correspond with a bone restoration plane,    opening out said expansible implant in said bone restoration plane with a view to forming a cavity ( 72 ) inside said bone,    injecting a filling material into said cavity containing said implant ( 74 ) with a view to filling the latter.    
     
     
         2 . Method according to  claim 1 , characterised in that it comprises opening out said expansible implant ( 1 ,  101 ) 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.  
     
     
         3 . Method according to  claim 1 , characterised in that the step comprising opening out said expansible implant ( 1 ,  101 ) comprises opening out a first ( 6 ,  106 ) and a second ( 7 ,  107 ) opposite plate, forming respectively a first ( 7 ,  107 ) and a second ( 8 ,  108 ) support surface in said bone.  
     
     
         4 . Method according to  claim 3 , characterised in that said first ( 7 ) and second ( 8 ) support surfaces in said bone have respectively a length which is substantially equal to the length of said implant.  
     
     
         5 . Method according to  claim 3 , characterised in that said first ( 6 ,  106 ) and second ( 7 ,  107 ) plates form first ( 7 ,  107 ) and second ( 8 ,  108 ) support surfaces which are continuous over their length respectively.  
     
     
         6 . Method according to  claim 5 , characterised in that said first ( 6 ,  106 ) and second ( 7 ,  107 ) plates form respectively continuous smooth support surfaces.  
     
     
         7 . Method according to  claim 3 , characterised in that said first ( 6 ) and second ( 7 ) plates form respectively partially cylindrical support surfaces, one generator ( 11 ) of which is parallel to a longitudinal axis ( 10 ) of said expansible implant.  
     
     
         8 . Method according to  claim 3 , characterised in that the step comprising opening out said first ( 6 ) and second ( 7 ) plates comprises raising the latter by support under the plates.  
     
     
         9 . Method according to  claim 1 , characterised in that the step comprising injecting a filling material ( 74 ) into said cavity ( 72 ) 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.  
     
     
         10 . Expansible implant ( 1 ,  101 ) which can take part in restoration of human or animal bone anatomy, characterised in that it comprises: 
 a single determined expansion plane ( 2 ,  102 ), intrinsic to said implant,    means ( 3 ,  103 ) for positioning the expansible implant in said bone ( 60 ) in order to make said expansion plane intrinsic to said implant correspond with a bone restoration plane,    means ( 4 ,  104 ) for opening out the expansible implant in said expansion plane intrinsic to said implant with a view to forming a cavity ( 72 ) inside said bone.    
     
     
         11 . Expansible implant according to  claim 10 , characterised in that it comprises means ( 5 ,  105 ) for controlling a determined expansion value, between a minimum thickness (A) of the implant before any expansion of the latter and a maximum thickness (B) of the implant after its maximum expansion.  
     
     
         12 . Expansible implant according to  claim 10 , characterised in that it comprises a first ( 6 ,  106 ) and a second ( 7 ,  107 ) plate which are opposite and able to form respectively a first ( 8 ,  108 ) and a second ( 9 ,  109 ) support surface in said bone ( 60 ), which surfaces are intended to be moved one away from the other along said single expansion plane ( 2 ,  102 ) during expansion of the implant ( 1 ,  101 ).  
     
     
         13 . Expansible implant according to  claim 12 , characterised in that said first ( 6 ,  106 ) and second ( 7 ,  107 ) opposite plates form first ( 8 ,  108 ) and second ( 9 ,  109 ) support surfaces which are able to be displaced perpendicularly to a longitudinal axis ( 10 ,  110 ) of said expansible implant ( 1 ,  101 ) during the expansion of the latter.  
     
     
         14 . Expansible implant according to  claim 12 , characterised in that said first ( 8 ) and second ( 9 ) support surfaces in said bone have respectively a length which is substantially equal to the length of said implant.  
     
     
         15 . Expansible implant according to  claim 12  characterised in that said first ( 6 ,  106 ) and second ( 7 ,  107 ) plates form first ( 8 ,  108 ) and second ( 9 ,  109 ) support surfaces which are continuous over their length respectively.  
     
     
         16 . Expansible implant according to  claim 15 , characterised in that said first ( 6 ,  106 ) and second ( 7 ,  107 ) plates form respectively continuous smooth support surfaces.  
     
     
         17 . Expansible implant according to  claim 12 , characterised in that said first ( 6 ) and second ( 7 ) plates form respectively partially cylindrical support surfaces, one generator ( 11 ) of which is parallel to a longitudinal axis ( 10 ) of said expansible implant ( 1 ).  
     
     
         18 . Expansible implant according to  claim 12 , characterised in that it comprises a first ( 12 ,  14 ) and a second ( 13 ,  15 ) support for each of said first ( 6 ) and second ( 7 ) plates, which are situated under the latter respectively.  
     
     
         19 . Expansible implant according to  claim 18 , characterised in that said first ( 6 ) and second ( 7 ) plates comprise respectively a first ( 16 ,  18 ) and a second ( 17 ,  19 ) cantilever wing, the respective attachment zones of which are situated at the level of said first ( 12 ,  14 ) and second ( 13 ,  15 ) supports.  
     
     
         20 . Expansible implant according to  claim 19 , characterised in that said first ( 16 ,  18 ) and second ( 17 ,  19 ) cantilever wings have respectively a length corresponding substantially to the maximum displacement value of one of said first ( 6 ) or second ( 7 ) plates in said single expansion plane ( 2 ).  
     
     
         21 . Expansible implant according to  claim 10 , characterized in that said means ( 3 ,  103 ) for positioning the expansible implant in said bone in order to make said expansion plane ( 2 ,  102 ) intrinsic to said implant correspond with a bone restoration plane, comprise engagement means ( 37 ,  38 ,  137 ,  138 ) allowing orientation of said implant angularly about a longitudinal axis ( 10 ,  110 ) of said expansible implant ( 1 ,  101 ).  
     
     
         22 . (canceled)