Surgery – Truss – Pad
Patent
1986-12-17
1988-09-06
Thaler, Michael H.
Surgery
Truss
Pad
128 92VY, 30166A, 30286, A61B 1714
Patent
active
047685042
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a device for performing an osteotomy, of the type utilizing a saw blade driven by an oscillating drive means for performing a reciprocating movement of the saw edge.
2. Description of the Prior Art
There are already known various saws for performing an osteotomy, i.e. saws having a straight saw blade, saws having a saw blade with bent saw edge and also saws, in which the saw edge forms a closed circle. While both first-mentioned saw blades are mainly used for completely severing a bone, for example in case of an amputation, the last-mentioned saw blade is mainly used for withdrawing a piece of bone for examination.
The saws are either moved manually or by a drive means being, as a rule, pneumatically energized. In this connection, it is known to give to the saw blade a rotating movement or an oscillating movement.
The device according to the invention is mainly intended for a bone treatment in case of a wrongly healed bone fracture, i.e. if the bone fragments do not assume the correct relative position at the fracture area but include, for example, an angle one with the other in place of stretched position. In this case it is necessary to sever the bone at the area of the bone fracture and to adjust the thus obtained bone parts in the correct relative position, so that the fractured area may again heal in this correct position. It is important that both bone portions contact one another over as great a surface as possible, because the greater the contact surface between both bone portions the better and less troublesome is the healing.
If a correction shall be effected in case of a cured fraction area in which both bone portions do not assume the desired stretched position, but include one with the other a blunt angle, the procedure up till now was such that a wedge-shaped bone piece was cut out of the healed fractured area, the wedge being shaped such that positioning of both bone portions in the stretched position was possible. This known treating method results, however, in a plurality of drawbacks. For example, when cutting out a wedge, the total length of the bone will be reduced, which results, as a rule, also in functional drawbacks. Furthermore, it is very difficult to exactly determine the required wedge angle, on the one hand, and to cut out a wedge having this wedge angle, on the other hand. For obtaining a suitable contact between the bone portions adjusted along a straight line at the location of the cutting operation, which contact is required for the least troublesome healing process, it is frequently necessary to effect an additional cutting operation. Such additional cutting operation results, however, in a further reduction of the length of the bone. It is a further drawback that, also in case of an exact cut, the contact surface between both bone portions corresponds to the cross section of the bone and is thus approximately circular and in consequence comparatively small.
It is also known to give the contact area at the severed fractured area the shape of a V. The contact area is thus apparently increased, but in practice there result, however, only individual contact points, mainly because the roof-like protrusion of one of the bone portions does not exactly fit the V-shaped recess of the other bone portion when aligning the bone portions into the stretched position. In practice this results in a substantial reduction of the contacting surface, along which both bone portions actually contact one another. When applying this method, it is furthermore necessary to chisel the V-shaped impression out of one bone portion, which is extremely difficult and time-consuming and fequently results in shivering of the bone.
There is further known the so-called hexagonal osteotomy, in which the contacting surface has the shape of a partial contour of a polygon, which is cut out of the bone. Such a shape of the contacting surface can, however, only be produced with extreme difficulty and suffers furthermore from the drawb
REFERENCES:
patent: 2294303 (1942-08-01), Jagow
patent: 4273117 (1981-06-01), Neuhauser
patent: 4284080 (1981-08-01), Rehder
patent: 4509511 (1985-04-01), Neufeld
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