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