Surgery – Instruments – Orthopedic instrumentation
Patent
1998-06-08
2000-02-29
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 54, 606104, A61B 1764
Patent
active
060303875
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a fixation device for a bone fracture.
BACKGROUND OF THE INVENTION
A fixation device according to the species is already known from DE 41 13 083 A1. This fixation device has three or four rings as clamping jaws, said rings being designed as either closed or sector rings. The rings are connected with one another by rods. For mutual positioning of the rings, the rods are axially displaceable and pivotable with respect to the rings and can be clamped in position respective to the rings. Holders are provided on the rings for bone wires or bone fixation and retaining pins.
The known fixation device permits free relative movement of the rings in space so that the bone fragments can be positioned and repositioned very exactly. The fixation device is secured in a stable fashion in precisely set positions by clamping the rods to the rings.
A fixation device is known from DE 94 01 291 U that has only two clamping jaws for provisional emergency care of the patient, with each sector ring having two holders for the clamping pins and with each holder having at least two receptacles for the clamping pins, i.e. the fixation and retaining pins, said receptacles being offset with respect to one another perpendicularly with respect to the plane of the sector ring. The clamping pins are designed as cylindrical pins that have a small point at their anterior ends, said point being capable of being pressed superficially into the bone. These clamping pins are provided with an external thread in their rear areas. After the clamping jaws are positioned, the clamping pins are then advanced by the suitably designed receptacle that cooperates with the external threads of the clamping pins until they rest on the surface of the bone and provide the necessary grip. This fixation of the clamping pins is cumbersome and time-consuming.
SUMMARY OF THE INVENTION
An object of the present invention therefore is to improve a fixation device according to the species in such fashion that positioning and fixation of the fixation device on the bone are considerably simplified.
This object is achieved according to the invention with a fixation device with clamping jaws having rods connecting the clamping jaws, the rods being adjustable axially and angularly relative to the clamping jaws and clampable in a desired position. The fixation device includes a fixation pin applicator releasably connectable with the clamping jaws for bringing a fixation pin into a desired position.
The fixation device offers a minimally invasive alternative to surgery of fractures of the tibia. The individual fragments are secured in the area of the cortex in each instance without the medullary cavity being opened (so-called pinless nail method). The fixation device can be applied rapidly and simply because of the fixation pin applicator provided according to the invention, and permits intraoperative and postoperative repositioning in all planes. This technique avoids contamination of the medullary cavity. A direct procedural change to marrow nailing poses no risk, i.e., it can be performed without an increased risk of infection. In addition, when the fixation device according to the invention is used, the device can remain in place even during marrow nailing, considerably simplifying marrow nailing and also allowing the procedure to be performed more rapidly.
Advantageous embodiments of the present invention include that the fixation pin applicator can be designed in the form of a pistol, and can have in addition to a fixed handle, a movable handle part by which a plunger acting on the fixation pin can be displaced.
In the retaining pin applicator, a transport plate for moving the plunger against the force of a spring can be moved by the movable handle part. The plunger and therefore the retaining pin is thus moved toward the desired position by this transport plate.
The fixation pin applicator can be secured to the clamping jaw by a latching mechanism in an especially simple fashion. To release the latching mec
REFERENCES:
patent: 5312403 (1994-05-01), Frigg
patent: 5578032 (1996-11-01), Lalonde
Buiz Michael
Reip David O.
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