Surgery – Instruments – Orthopedic instrumentation
Patent
1996-10-21
1998-09-22
Tucker, Guy V.
Surgery
Instruments
Orthopedic instrumentation
606 75, 606101, A61B 1780
Patent
active
058108220
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This application is filed under 35 U.S.C.371, based on PCT/FR95/00544 which was filed on Apr. 26, 1995.
The present invention concerns equipment for correcting deformation of certain long bones, inparticular small long bones in the human body. The equipment of the invention is used in particular to correct deformation, mainly hallux valgus deformation, of the hallux (innermost digit) of the foot.
The hallux comprises three long bones in succession articulated to each other, namely the first metatarsal, the first phalange and the second phalange. A hallux valgus deformation is an excessive inward deviation of the hallux.
It is tempting to correct this excessive inward deviation by removal of bone from the first metatarsal (interior opening or exterior closing osteotomy). Unfortunately, until now, precise angular correction has not been possible for want of suitable osteosynthesis equipment.
Document WO-A-94 02073 describes an osteosynthesis clip for the head of the tibia or the head of the femur. This device has a rigid body, which is a priori non-deformable, curved (S-shape) and fastened at both ends to two divergent pins with teeth causing compression of bone fragments on either side of the fracture. Apart from the fact that a device of this kind is not capable of penetration into the cortical bone, which penetration is necessary for correcting deformations of the feet, and does not have any angular modification action due to its shape, any correction achieved is independent of the shape of the rigid body and depends only on the angle of the osteotomy prior to insertion of the pins. Given that it is always difficult to achieve a precise angle in osteotomy, the device does not easily achieve a precise angular correction. Also, the device compresses the bone fragments which means that it is not suitable for interior opening osteotomy.
Document FR-A-2 686 012 describes a plate and blade device for angular correction of the tibia. Because of the S-shape of the body and because of the presence of a blade member, the device is suitable only for correction of the tibia and is not appropriate for other bones such as the long bones of the foot. Also, because the body has to be very rigid to withstand the high mechanical stresses on the tibia, it is not deformable and the angle between the blade member and the body is fixed. The angular correction obtained by osteotomy is therefore adjusted by varying the angle at which the blade member penetrates the epiphysis, and by bringing the diaphysis progressively into contact with the body. This adjustment is difficult and delicate. Also, an offset results between the body and the external surface of the epiphysis, depending on the angular correction made. The device is not suitable for treatment of small long bones as the distance between the penetration orifice of the blade member and the osteotomy is then too small to allow variation in the angle of penetration. If an acute penetration angle were chosen, the blade member would impinge on the osteotomy.
Document EP-A-0 552 109 describes a clip for pinning a ligament to a bone. A device of this kind is not capable of angular correction and the proximity of its pins and its locking fingers means that it is unable to support an osteotomy.
Document FR-A-2 362 616 describes a clip to be shaped into a tube to hold a bone straight. This device is not capable of angular correction.
The problem to which the present invention is addressed is therefore that of providing equipment for easy and effective correction of deformation of small long bones, in particular hallux valgus deformation of the hallux. The equipment must provide the precise angular correction of itself, without requiring great accuracy of the osteotomy. The equipment must hold the adjacent portions of the bone at the correct angle after osteotomy, without making the bone fragile, and in particular allowing a maximum distance between the osteotomy and the fixing members penetrating the bone.
The equipment of the invention must also be us
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Eilberg William H.
Tucker Guy V.
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