Dentistry – Apparatus – Having gauge or guide
Patent
1989-11-13
1991-11-26
Swiatek, Robert P.
Dentistry
Apparatus
Having gauge or guide
606 96, A61C 300
Patent
active
050678981
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an external fixing device for bone surgery, particularly dento-maxillo-facial surgery, and especially to a device for carrying out trepanation, allowing implants to be positioned.
The invention aims to provide an external fixing device of the above-mentioned kind, which can be equipped with various fittings allowing one to carry out with a very high precision all the necessary trepanations for positioning implants whatever the kind of the latter may be.
SUMMARY OF THE INVENTION
To this end, according to the invention, this external fixing device comprises one or more undeformable rods serving, in particular, as a handle of the fixing device and presenting a portion of constant cross-section and of rectilinear axis. The device further includes a spacer element, such as a lip retractor, intended to bear on a first face of the bone to be trepaned and which is fixed to the rod at a distance from the extremities of said portion of the rod and substantially perpendicularly to the axis of said rod portion, one or more moving elements associated with the above-mentioned rod portion in order to be able to freely slide along this portion so as to rest either on the mucosa covering a second face of the bone, opposite to the first face with which the spacer element cooperates, or on a protection plate for this mucosa, or with this second face of the bone in which an opening is provided, this opening having an axis substantially parallel to the axis of the rod portion, this opening being intended to allow the passage of a tool for trepaning the bone, such as a bur. And the device further includes means provided on said element in order to immobilize it in a selected position with respect to said rod portion.
According to an embodiment of the invention, the fixing device comprises a moving support for a trepanation tool such as a bur-holder angle-shaped piece arranged to freely slide along said rod portion opposite to the spacer element with respect to the moving element, means arranged to immobilize the moving support with respect to the rod in a selected position, means for containing the bur-holder angle-shaped piece, and means for immobilizing it with respect to the moving support in order that the bur and the opening provided in the moving element are coaxial.
According to an advantageous embodiment of the invention, the external fixing device comprises a moving member provided for supporting a guide for the trepanation tool in order that this guide and the opening of the spacer element are coaxial, this member freely sliding onto the rod portion opposite to the moving element with respect to the spacer element and presenting means arranged to immobilize it on the rod portion in a selected position.
According to a particularly advantageous embodiment of the invention, the fixing device comprises, on the one hand, a moving support for a trepanation tool, such as a manual bur-holder piece, this support being arranged to freely slide along the rod portion, opposite to the spacer element with respect to the moving member, means arranged to immobilize this support in a selected position with respect to the rod portion, and means arranged to immobilize the trepanation tool in order that its axis coincides with the axis of the opening of the spacer element. The fixing device of this embodiment further includes a moving support for one or more trepanation tools, such as a bur, this support being arranged to freely slide along the rod portion in the portion of the latter, which is comprised between the spacer element and the moving element, means arranged to immobilize the support in a selected position with respect to the rod portion and means for immobilizing the trepanation tool in the support in order that its axis is transverse to the axis of the opening existing in the spacer element.
BRIEF DESCRIPTION OF THE DRAWINGS
Other details and particularities of the invention will become apparent from the description and the accompanying drawings which show,
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Lucchesi Nicholas D.
Swiatek Robert P.
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