Surgery – Instruments – Orthopedic instrumentation
Patent
1997-02-11
1998-03-24
Tucker, Guy V.
Surgery
Instruments
Orthopedic instrumentation
606 76, 606 86, 606215, A61B 1756
Patent
active
057307431
DESCRIPTION:
BRIEF SUMMARY
This application is filed under 35 USC 371 based on PCT/DE95/00594 which was filed May 3, 1995, published as WO95/31940, Nov. 30, 1995.
BACKGROUND OF THE INVENTION
The invention is directed to a supporting grid for the mechanical support of a cover membrane covering a bone void filled with a bone replacement material such as hydroxyl apatite granules, particularly a recess in the proper bone tissue of the body.
It is standard in osteosurgery, for example in the reconstruction of bones in plastic surgery or in surgical operations of the jaw, to fill bone voids in the form of recesses or cavities in the proper bone tissue of the body with ossiferous material that is usually composed of a mixture of bone replacement material such as hydroxyl apatite granules and proper bone particles of the body. Until a replacement bone has formed from the particulate bone replacement material, such bone voids must be covered with a cover membrane mechanically stabilized by a supporting grid.
DE 91 15 341 U1 discloses a supporting grid for covering particulate bone replacement agents that is composed of a biodegradable and thermoplastically shapable polymer. The supporting grid serves the purpose of enabling a mechanical support of bone replacement material and, for example given complete partition of the lower jaw, fixing the two resection stumps to one another. However, it has only limited flexibility and therefore requires comparatively great outlay in order to be adapted to the contours of the bone to be treated.
SUMMARY OF THE INVENTION
The invention is based on the object of creating a novel supporting grid that overcomes the above-described disadvantages and that can be more precisely adapted to the bone under treatment, particularly the jaw bone, with less outlay.
The invention is therefore based on the object of improving the supporting grid to such effect that a faultless adaptation of the supporting grid to the shape of the bone void and the proper bone of the body surrounding it is assured.
In a development of the supporting grid of the species, this object is achieved in that the supporting grid is bendable around at least one axis predetermined by the fashioning of the supporting grid.
It is thereby inventively provided that the outside contour of the unbent supporting grid essentially corresponds to that of an annulus sector.
The invention further provides that the supporting grid is bendable around at least one axis that is concentric with the outside arc of the annulus sector and located in the plane of the bent-over supporting grid.
Over and above this, it is proposed that the supporting grid is bendable around an axis perpendicular to and outside the plane of the bent-over supporting grid.
It is provided in a further development of the invention that the supporting grid comprises recesses or slots along the inside arc and along the outside arc of the annulus sector.
The recesses or slots along the inside arc are preferably arranged offset relative to the recesses or slots along the outside arc.
The invention also proposes that the recesses or slots along the inside arc and the recesses or slots along the outside arc respectively comprise a uniform shape.
The invention also provides that the shape of the recesses or slots along the inside arc differs from the shape of the recesses or slots along the outside arc.
The recesses or slots at the inside arc and at the outside arc each preferably comprise a radial symmetry axis.
It is provided in an advantageous development of the novel supporting grid that the recesses or slots at the inside arc are broader transversely to the radial symmetry axis in the immediate proximity of said inside arc than the recesses or slots at the outside arc in the immediate proximity thereof.
It is also proposed that the recesses or slots at the outside arc are fashioned radially inwardly concave from the outside contour and then conically tapering.
The invention further provides that the recesses or slots at the inside arc are fashioned initially essentially hose-like radiall
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Durr Walter
Kirsch Axel
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