Surgery – Instruments – Orthopedic instrumentation
Patent
1997-09-29
1999-10-26
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
408 11, A61B 1700
Patent
active
059719885
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention is related to a device for material removing machining of objects or work pieces, comprising an elongated tool adapted to rotate about a longitudinal axis thereof, which tool comprises a shank adapted to be coupled to a drive unit and a cutting head connected to the shank.
BACKGROUND OF THE INVENTION
When implanting and replacing bone prostheses such as hip joint prostheses, it is often necessary to work in deep recesses of the body in a chip removing fashion. This is the case especially when a hip joint prostheses is to be replaced, in the course of which also the bone cement which is situated deep within the bone shaft has to be removed. In the past, this has been performed manually, using special tools such as chisels or scrapers. In principle it is also possible to use available. drilling or milling tools, which can be connected to small hand-held machine tools. Due to the depth of the body recesses which are to be worked on, the drilling or milling tools would have to be of such great length that a dependable chip removing machining would be impossible due to the then occurring instabilities and vibrations. This disadvantage occurs also in other applications, in which there is to be a chip removing machining of relatively deep work piece cavities.
Based on this, it is the object of the invention to develop a device for chip removing machining of the type described above, which is of simple construction and which operates with high stability and without vibrations.
In order to solve tis object, the combinations of features of claims 1 and 33 are proposed. Advantageous embodiments and further developments of the invention result from the dependent claims.
SUMMARY OF THE INVENTION
The solution according to the invention is based on the idea that there is provided a sleeve which is disposed between the shank and the cutting head and which is preferably coaxial with respect to the tool axis, which sleeve is at one end thereof rigidly and nonrotatably connected to the cutting head and carries the shank at an opposite end thereof. This results in a light tool which still is of great rigity, so that even for great tool lengths a safe and vibration-free operation is possible.
The cutting head and/or the shank may be removably connected to the sleeve by means of a screw-, snap- or bayonet-connector. It is also possible that the shank is integrally connected to the sleeve.
According to a preferred embodiment of the invention a connecting rod penetrating the sleeve in longitudinal direction, one end of which rod is adapted to be connected to the cutting head which is non-rotatably mounted at the one end of sleeve, and at the other end of which rod there is provided an axially adjustable clamping member which acts directly or indirectly over the shank on the end of the sleeve opposed to the cutting head and clamps the cutting head and which is preferably formed to be a clamping nut.
A further preferred embodiment of the invention provides that the free space in the sleeve is used as a removal channel for the chips created during the machining. To this end at least one chip entrance opening which communicates with the inside of the sleeve may be provided in the cutting head.
It is further of advantage when the sleeve comprises at least one feed channel which extends up to the cutting head and which is adapted to be subjected to a pressurized fluid which can be supplied to the work site in front of the cutting head. To this end, the connecting rod itself is preferably formed to be hollow. When the device is used for the chip-removing machining during the implantation or replacement of a prosthesis in human bone material, an antiseptic agent can be added to the fluid, so that the damage of the bone tissue or of the bone does not lead to an inflammation.
In order to improve the chip removal, the feed channel can be adapted to be subjected to a fluid which suspends chips created at the work site in a gel-like manner. A further improvement in this respect is achieved when the
REFERENCES:
patent: 2835023 (1958-08-01), Steeves
patent: 4329092 (1982-05-01), Ponitzsch et al.
patent: 4871286 (1989-10-01), Hunt
Reccius Helmut
Stolz Gerhard
Buiz Michael
Komet Praezisionswerkzeuge Robert Breuning GmbH
Trinh Vikki
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