Surgery – Truss – Perineal
Patent
1987-08-25
1989-01-03
Hafer, Robert A.
Surgery
Truss
Perineal
128 92YV, 128 92YZ, 128 92VT, A61F 504
Patent
active
047949198
DESCRIPTION:
BRIEF SUMMARY
Field of the Invention
The present invention relates to a fixating device for treatment of fractures of the femur in the vicinity of the hip joint, in particular petrochantera fractures, and being of the kind set forth in the preamble of the following main Claim.
BACKGROUND OF THE INVENTION
The fixating devices used in surgical methods known hitherto require relatively large incisions to be made in the skin of the patient. This prolongs the time required to perform the surgical operation, which commensurately increases the risk of infection.
In the case of one known fixating device it is necessary to penetrate the femur in a number of places, in order to enable a plurality of attachment screws to be inserted. The work entailed herewith is additionally time consuming. Furthermore, the femur is weakened additionally through the number of perforations that need be made therein. This known device comprises a so-called angle plate which has the form of a long plate which is placed along the outside of the femur and attached thereto by means of a multiple of screws which pass through the femur, in holes prepared therein for this purpose.
The upper end of the plate has provided therein at least one guide aperture for receiving a fixating nail or screw. This nail or screw is anchored in the bone tissue within the head of the femur. The major drawback with a device of this kind is that it is necessary to cut and retract a relatively long section of skin, in order to reach all of the plate apertures that are intended to receive through-passing screws. The length of the incision made in the skin is normally longer than the length of the plate.
These many working procedures all contribute in prolonging the time required to perform the operation, which is the primary cause for the increase in the risk of infection. The area of the leg on which the operation is performed is left open and will therefore be exposed to bacterial infection over a correspondingly longer period of time.
In another known operating technique there is used a fixating device which, distinct from the aforedescribed known device, does not require as long an incision in the skin as for the above device. Instead a smaller incision is made and the bone wall is thereafter penetrated in the region of the knee joint. From three to five pre-bent steel nails having a thickness of about 5 mm and a length of from 40 to 50 cm are then inserted into the aperture thus prepared. These nails are driven up into the femur and out into the bone substance of the femur neck, and from there into the rounded head of the femur. This method requires great skill on the part of the surgeon performing the operation. It is often impossible to avoid wrongful settings in the form of an outward twisting of the bone. Neither is it uncommon for the nails to slide rearwardly and penetrate the skin in the region of the knee joint. This results in sores, which will always become infected. A patient who is operated on in the region of the knee joint will also suffer discomfort at the knee joint in addition to the pain experienced from the broken hip joint.
The French Patent Specification No. 1 093 696 teaches a fixating device which comprises two separate parts. A first part of this device comprises a U-plate which is intended to lie against the femur at a relatively long distance from the femur neck and on the opposite side of the bone in relation thereto. The plate is terminated at its upper end with a guide sleeve which extends obliquely upwards and which is intended to accommodate a friction bolt, which is screwed into the neck of the femur. The plate has positioned therein a shank, which is secured to the plate with the aid of a screw. The shank is extended at its other end with a hook which extends through a hole in the plate and in through an aperture formed in the wall of the bone, so as to grip around the defining edge of said hole, with the pointed end of the hook penetrating into the inside of the bone wall. This device is both complicated and expensive to manufacture,
REFERENCES:
patent: 2414882 (1947-01-01), Longfellow
patent: 2772676 (1956-12-01), Pohl
patent: 3489143 (1970-01-01), Halloran
patent: 4011863 (1977-03-01), Zickel
patent: 4055172 (1977-10-01), Ender et al.
patent: 4465065 (1984-08-01), Gotfried
patent: 4483335 (1984-11-01), Tornier
Hafer Robert A.
Sam Charles H.
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