US4881897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tooth-root implant with long-term resistance to repetitive stresses
Assignee: Ernst Leitz Wetzlar GmbH
•
Filing: 1987-05-07
•
Granted: 1989-11-21
•
Expires: 2007-05-07
Abstract
Abstract PCT No. PCT/DE87/00206 Sec. 371 Date Jan. 7, 1988 Sec. 102(e) Date Jan. 7, 1988 PCT Filed May 7, 1987 PCT Pub. No. WO87/06816 PCT Pub. Date Nov. 19, 1987.A tooth-root implant of high fatigue strength, intended for a two-stage implantation technique, comprises a sleeve (1) which, in its inner region, has retention means (6b), on which a pressure plate (2a) rests loosely. An insertable superstructure bearing (3) is arranged on the pressure plate (2a) and is surrounded, at least partially, by a plastic casing (4). A screw plug (5) is also provided which closes off the upper part of the sleeve (1) in such a way that positive contact is made.
Inventors
- 👤 Henning Franek
- 👤 Klaus-Konrad Deutscher, deceased
- 👤 Heinz Broemer
- 👤 Volker Strunz
- 👤 Wolfgang Rosenkranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:51
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/008; A61C8/0018; A61C8/0048; A61C8/005; A61C8/0066; A61C8/0086; A61C8/0054; A61C8/0056; A61C8/0057; A61C8/0059; A61C8/006; A61C8/0069
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
105 words
A tooth-root implant of high fatigue strength, comprising; a sleeve having a coating of a bioactive material; a pressure plate situated within said sleeve which serves as a damping diaphragm and on which rests a superstructure bearing surrounded, at least partially, by a plastic casing, and wherein a screw plug is provided with closes off an upper part of the sleeve in such a way that positive contact is made with the plastic casing; and retention means for supporting said pressure plate, said pressure plate resting loosely on said retention means; wherein said pressure plate and said superstructure bearing are composed of high fatigue-strength metal.
Claim 2
Dependent Claim
105 words
A tooth-root implant of high fatigue strength, comprising; a sleeve having a coating of a bioactive material; a pressure plate situated within said sleeve which serves as a damping diaphragm and on which rests a superstructure bearing surrounded, at least partially, by a plastic casing, and wherein a screw plug is provided with closes off an upper part of the sleeve in such a way that positive contact is made with the plastic casing; and retention means for supporting said pressure plate, said pressure plate resting loosely on said retention means; wherein said pressure plate and said superstructure bearing are composed of high fatigue-strength metal.
Claim 3
Dependent Claim
27 words
An implant as claimed in claim 1, wherein said retention means is situated in an inner region of the sleeve in order to support the pressure plate.
Claim 4
Dependent Claim
22 words
An implant as claimed in claim 2, wherein the retention means is designed as a slope extending continuously in a circumferential manner.
Claim 5
Dependent Claim
19 words
An implant as claimed in claim 2, wherein the retention means comprises as least three radial lugs pointing inwards.
Claim 6
Dependent Claim
23 words
An implant as claimed in claim 2, wherein the retention means is the upper part of a cylindrical thickened zone within the sleeve.
Claim 7
Dependent Claim
37 words
An implant as claimed in claim 1 wherein the retention means is an intermediate diaphragm hermetically separating the sleeve into an upper region pointing towards the superstructure and a lower region pointing towards the bony implant bed.
Claim 8
Dependent Claim
21 words
An implant as claimed in claim 6 wherein the lower region of the sleeve is filled with an elastic plastic material.
Claim 9
Dependent Claim
37 words
An implant as claimed in claim 6 wherein the lower region has a prestressed helical spring which rests against the underside of the intermediate diaphragm at one end and against the closing-off part at the other end.
Claim 10
Dependent Claim
19 words
An implant as claimed in claim 8, wherein, instead of the helical spring, a prestressed flexural bar is provided.
Claim 11
Dependent Claim
34 words
An implant as claimed in claim 1 wherein the retention means for the pressure plate is arranged in a position within the region between the upper third and the lower fifth of the sleeve.
Claim 12
Dependent Claim
21 words
An implant as claimed in claim 1, wherein the pressure plate is designed as a round disc with a central perforation.
Claim 13
Dependent Claim
28 words
An implant as claimed in claim 11, wherein the pressure plate is configured as the round disc (2a) which additionally has an annular bead in its edge region.
Claim 14
Dependent Claim
47 words
An implant as claimed in claim 11, wherein the pressure plate has a plurality of slots which extend from the periphery of the pressure plate towards its center, without reaching the central region of the pressure plate itself, this central region being provided with a central perforation.
Claim 15
Dependent Claim
29 words
An implant as claimed in claim 1 wherein the pressure plate is formed by removing at least one plate segment in the form of a portion of a circle.
Claim 16
Dependent Claim
17 words
An implant as claimed in claim 1 wherein the pressure plate has a variable cross-sectional thickness profile.
Claim 17
Dependent Claim
26 words
An implant as claimed in claim 1 wherein the upper side and lower side of the pressure plate each has a plane, spherical, or aspherical form.
Claim 18
Dependent Claim
44 words
An implant as claimed in claim 1, wherein the superstructure bearing has a cylindrical cross-sectional geometry in its base region and is either bar-shaped or bottlenecked-shaped in its region pointing toward the superstructure, at least the last-mentioned region being equipped with a plastic casing.
Claim 19
Dependent Claim
26 words
An implant as claimed in claim 17, wherein the base region of the superstructure bearing is retained positively in the upper inner space of the sleeve.
Claim 20
Dependent Claim
29 words
An implant as claimed in claim 17 wherein an upwardly narrowing region of the superstructure bearing is designed as a threaded neck for the releasable fastening of the superstructure.
Claim 21
Dependent Claim
32 words
An implant as claimed in claim 1, wherein, in order to perform a two-stage implantation technique, the sleeve in its upper region, has an internal thread for temporarily receiving a sleeve plug.
Claim 22
Dependent Claim
38 words
An implant as claimed in claim 1, wherein a part of the sleeve pointing towards the bony implant bed has an insertable closing-off part which preferably has at least one recess for the insertion of a hexagon-socket wrench.
Claim 23
Dependent Claim
22 words
An implant as claimed in claim 21, wherein the closing-off part is retained in the sleeve by means of a press fit.
Claim 24
Dependent Claim
37 words
An implant as claimed in claimed 21, wherein the closing-off part has a thread which matches a corresponding internal thread in the lower sleeve part, and also contains at least one recess for engaging a hexagon-socket wrench.
Claim 25
Dependent Claim
18 words
An implant as claimed in one of claim 21 wherein the closing-off part has a rounded outer contour.
Claim 26
Dependent Claim
23 words
An implant as claimed in claim 21, wherein the sleeve and the closing-off part have a partial or complete coating of bioactive material.
Claim 27
Dependent Claim
47 words
An implant as claimed in claim 25, wherein the bioactive material is a composite material which has been produced by isostatic, preferably hot-isostatic pressing of an inorganic bioactive starting material and of a metal powder compatible with the human body, preferably a titanium or titanium alloy powder.
Claim 28
Dependent Claim
54 words
An implant as claimed in claim 25 wherein the sleeve and/or the closing-off part have, in discrete surface regions, inclusions of bioactivated composite materials obtained by isostatic or hot-isostatic pressing, the non-positive and positive anchoring of the individual composite bodies being carried out, with hot-isostatic pressing once again taking place at the same time.
Claim 29
Dependent Claim
40 words
An implant as claimed in claim 1, wherein, as seen in plan view, the superstructure bearing has at least one flattened surface as a rotation prevention means, which matches a corresponding thickened zone in the inner region of the sleeve.
Claim 30
Dependent Claim
47 words
An implant as claimed in claim 1 wherein a stud guide or rail guide extending along the inner wall of the sleeve parallel to its vertical axis and matching a corresponding recess in the superstructure bearing is provided as a rotation prevention means for the superstructure bearing.
Claim 31
Dependent Claim
28 words
A use of the implant as claimed in claim 1 as a tooth-root implant for receiving a superstructure or as an individual pier for anchoring dental-prosthetic bridge structures.
Claim 32
Dependent Claim
19 words
An implant as claimed in claim 1, wherein said positive contact with said plastic casing is made under pressure.
Claim 33
Dependent Claim
15 words
An implant as claimed in claim 1, wherein said high fatigue-strength metal is spring steel.
References Cited (Backward Citations)
US2880508A
Cited
US3497953A
Cited
US3722094A
Cited
DE2247649A1
Cited
US3863344A
Cited
US3955280A
Cited
DE2413883A1
Cited
DE2419080A1
Cited
DE2704390A1
Cited
GB1586729A
Cited
DE2733394A1
Cited
US4220712A
Cited
DE2824118A1
Cited
DE2824214A1
Cited
US4215986A
Cited
DE3043336A1
Cited
DE3300764A1
Cited
EP0131831A2
Cited
US4622010A
Cited
US4552532A
Cited
WO1986001393A1
Cited
US4746293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |