Surgery – Instruments – Orthopedic instrumentation
Patent
1997-12-03
1999-11-30
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 72, 606 59, 606 61, A61B 1756
Patent
active
059934506
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY
The present invention relates to osteosynthesis devices, and more particularly to an improved ring which can be used in combination with a pin or a screw and is intended to maintain one or more fractured bones in compression, such as a bone of the hand or of the foot, and also to a device specially designed for compressing it.
Numerous devices intended to maintain two bones, or two bone fragments of a fractured bone, in compression have been described in the literature. For example, patent FR-A-2,549,650 describes an intra-medullary compression device which comprises a threaded rod bearing two opposite elements which each include disks for anchoring in the medullary cavity of the fractured bone, into which medullary cavity this device is introduced. The devices of this type are not suitable, however, for osteotomy of small bones.
U.S. Pat. No. 3,990,438 describes a fixation device for fractured bones comprising two parts, one of which has cutting threads which anchor in the main fragment of the bone, while the other part includes a thread cooperating with a screw, protruding from the bone, providing for the axial compression. This device cannot be used on bones of small dimension. Furthermore, the removal of the screw is very difficult on account of the osseous incarcerations which occur between the threads of the distal part of the screw and, in addition, the compression is not satisfactory.
Patent EP-A-085,493 describes a compression device comprising a self-tapping screw which engages in a sleeve, and the point of which fixes in the distal bone, as well as a blocking ring which is placed between the body of the screw and the sleeve.
Patent FR-A-2,695,026 describes a screw with fold-back wings integral with the proximal end of the screw, the head of which is hollow and can receive a cylindrical element acting on the free ends of the wings in order to fold them back. The whole arrangement can include an axial channel for the passage of a pin which is used for certain types of fractures.
Patent EP-A-0,209,685 describes a compression device formed by a screw which engages in a peg with a slotted head capable of fixing itself in the bone. This device has the disadvantage of being difficult to withdraw on account of the regrowth of bone which can block the peg.
These known devices are not generally designed for use in the reconstructive surgery of small bones, for example the bones of the foot and of the hand. Moreover, the head of the screw which is traditionally used stands out and forms a projection beyond the surface of the bone, and this entails serious risks of pain and of formation of seats of infection. This difficulty is eliminated in the screw known as the Herbert screw and formed by a headless compression screw, bearing on the two opposite cortical walls of the fractured bone or of the bone fragments, but the positioning of such a screw is a delicate operation.
Finally, it is generally imperative to prepare a very precise drill hole before putting into position the device for maintaining the fractured bone in compression, and this positioning, as well as the compression, are then often awkward to perform under good conditions.
The subject of the present invention is a novel osteosynthesis ring which is particularly designed for small bones, but may also be suitable for bones of large dimension, and which can be used in combination with a pin or a screw, and, where appropriate, an osteosynthesis plate.
Another subject of the invention is a device specially designed for the compression of such an osteosynthesis ring.
The osteosynthesis ring according to the present invention, for maintaining one or more fractured bones in compression, is intended to be used in combination with a pin or a screw, and, where appropriate, an osteosynthesis plate, and is of the type comprising a hollow cylindrical body; it is distinguished by the fact that: of revolution and matching the pin, means for blocking in translation and/or in rotation, at least one diameter in order to form at least two s
REFERENCES:
patent: 3990438 (1976-11-01), Pritchard
patent: 4612920 (1986-09-01), Lower
patent: 4760843 (1988-08-01), Fischer et al.
patent: 4776329 (1988-10-01), Treharne
patent: 4790304 (1988-12-01), Rosenberg
patent: 4903692 (1990-02-01), Reese
patent: 5437674 (1995-08-01), Worcel et al.
Buiz Michael
Ngo Lie N
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