Dentistry – Prosthodontics – Holding or positioning denture in mouth
Reexamination Certificate
2000-06-26
2001-08-28
Lucchesi, Nicholas D. (Department: 3732)
Dentistry
Prosthodontics
Holding or positioning denture in mouth
Reexamination Certificate
active
06280194
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an arrangement permitting anchoring of a threaded implant in bone, for example jawbone, in the human body by means of a screwing/tightening instrument. At its upper part, the implant has an anchoring hole for a unit, preferably in the form of a screw, intended to secure an element that can be attached to the implant and can in this case consist of a fixture holder, fixture, spacer, etc. The centre axis of the anchoring hole is also inclined in relation to the longitudinal axis of the implant.
The invention also relates to the use of an element, for example in the form of a fixture holder, fixture, spacer, etc., which can be attached to a threaded implant, where the implant is screwed into a bone, for example the jawbone, by means of an instrument and where the implant has an anchoring hole for the securing unit, preferably in the form of a screw, for the element in question.
PRIOR ART
The invention is further concerned with the screwing functions of implants of the type described, inter alia, in Swedish Patent 9203563-3 and PCT application WO 96/18355. A characteristic of this type of implant is the presence of an inclined threaded hole which can be arranged in a fixture for the implant or in the actual implant itself. The centre axis of the hole is inclined in relation to the axis of rotation of the implant. When anchoring further fixtures, spacers, etc. in the implant, an anchoring screw is used which can be screwed tightly into the internal thread of the anchoring hole.
The said PCT document mentions the possibility of using screwing instruments which are connected to the upper parts of the implant for the purpose of screwing the implant tightly into the bone in question.
DESCRIPTION OF THE INVENTION
TECHNICAL PROBLEM
A reliable and as far as possible simplified tightening function needs to be found. The invention is intended to solve this problem, among others.
The said PCT document proposes an instrument which uses the anchoring screw for securing a fixture to the implant. The instrument is provided with an inclined recess which coincides with or constitutes a continuation of the anchoring hole. The anchoring screw is in this case removed first, and the instrument is applied in such a way that the recess of the instrument is arranged concentrically in relation to the recess in the implant, after which they can be screwed tight by means of the said anchoring screw. When the implant has been tightened, the anchoring screw is loosened and removed, after which the instrument can also be removed. This procedure is a lengthy one. The inclined recess in the instrument is deep and problems can occur during screwing, unscrewing, etc., of the anchoring screw in question. The present invention is intended to solve this problem too.
It may be desirable not to have to act on the anchoring screw during the tightening or screwing-in of the implant into the bone. The invention solves this problem too.
SOLUTION
The feature which can principally be regarded as characterizing an arrangement according to the invention is, inter alia, that the element (fixture holder, fixture, etc.) that can be attached by means of the said unit (screw) is provided with means of cooperation with the instrument, and that the element and its means of cooperation are arranged to permit application of the instrument in a way which ensures that the axis of rotation of the instrument essentially coincides with the continuation of the axis of rotation of the implant.
An arrangement according to the invention can principally be regarded as being characterized by the fact that the tightening function exerted by means of the instrument is separate from the securing function exerted by means of the unit (screw) by virtue of the fact that the element (fixture holder, fixture, spacer, etc.) has a first portion via which the element is anchored by the anchoring unit in the implant, and a second portion which is separate from the first portion and which has cooperating means for the instrument.
Embodiments of the arrangement are specified in the attached subclaims.
The use according to the invention can principally be regarded as being characterized by the fact that the element (fixture holder, fixture, spacer, etc.) is used in the tightening operation with the instrument by virtue of the fact that the element has means cooperating with the instrument, to which means the instrument is applied with its axis of rotation essentially coinciding with the continuation of the axis of rotation of the implant.
Further developments of the said use are specified in the attached subclaims.
ADVANTAGES
By means of what has been proposed above, a considerably simplified and less expensive tightening function is obtained for implants in jawbone. The handling of small tightening screws can be avoided, and simple application to the implant for turning it or screwing it in can be effected. The locking function for the instrument can be made extremely simple by the fact that a conventional locking screw can be used in a manner known per se. The implant with associated element, i.e. fixture holder, fixture, spacer, etc., can be supplied as one unit to which the tightening instrument can be applied in an extremely simple and effective manner.
REFERENCES:
patent: 5350301 (1994-09-01), DeBuck
patent: 5362235 (1994-11-01), Daftary
patent: 5362236 (1994-11-01), Branemark
patent: 5564926 (1996-10-01), Brånemark
patent: WO 96/18355 (1996-06-01), None
Björn Göran
Kvarnstrom Bjarne
Connolly Bove Lodge & Hutz
Lucchesi Nicholas D.
Nobel Biocare AB
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