EP0595782A2
Expired / Lapsed
EP
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Anchoring element supporting prostheses or a joint mechanism for a reconstructed joint
Assignee: Medevelop AB
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Filing: 1993-10-27
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Granted: —
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Expires: 2013-10-27
Abstract
Abstract An anchoring element (1) for supporting prostheses or part thereof. The anchoring element (1) is substantially rotationally symmetrical and provided with external threads (20) and a central bore (2). At least one slit (3, 4, 5, 6) is arranged in spiral form around the longitudinal axis (13) of the element (1) and extends over at least the major part (11, 12) of the outer wall of the element. Said major part being provided with external threads (20), the chirality of said slit (3, 4, 5, 6) being the same as that of the outer threads (20). <IMAGE>
Inventors
- 👤 Per-Ingvar Branemark
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 18:10
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30749; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8625; A61F2/42; A61F2/4241; A61B17/686; A61B17/864; A61B17/8685; A61F2002/30001; A61F2002/30316; A61F2002/30535; A61F2002/30593; A61F2002/30594; A61F2002/30667; A61F2002/30677; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30782; A61F2002/30784; A61F2002/30785; A61F2002/30787; A61F2002/30841; A61F2002/30845; A61F2002/3085; A61F2002/30904; A61F2/32; A61F2/36; A61F2/3662; A61F2002/3678; A61F2002/368; A61F2002/3694; A61F2002/3698; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
140 words
In an essentially rotationally symmetric anchoring element for supporting prostheses or parts thereof, provided with external threads on the major part of its outside and arranged for connection at its outer end portion to said prostheses or parts thereof, and for insertion and anchoring in bone tissue by its opposite inner end portion, wherein at least one slit with cutting edges extends from the inner end in direction of the outer end portion, charcterized in that the anchoring element is provided with a centred through bore and that the slit is arranged in spiral form around the longitudinal axis of the anchoring element and extends over at least the major part of the outer wall of the element, said major part being provided with external threads, the chirality of the slit being the same as that of the outer threads.
Claim 2
Dependent Claim
31 words
The anchoring element as claimd in claim 1, wherein the wall thickness of the element progressively decreases over a portion near the inner end and in direction towards the inner end.
Claim 3
Dependent Claim
89 words
The anchoring element as claimd in claim 1 or 2, wherein a bridge of material is arranged between the walls of the slit and along a slit portion extending from the closed end of the slit, said bridge of material being penetrated by at least one hole, the inner wall of said bridge being delimited by the centred bore and the thickness of the bridge of material being substantially smaller than the wall thickness of the portion of the element extending in radial direction from the bridge of material.
Claim 4
Dependent Claim
50 words
The anchoring element as claimd in claim 1 or 3, wherein the lateral walls of the slit are plane-parallel in respect to each other and that the hole or holes penetrating the bridge of material are prefereably circular, the diameter of said holes being substantially similar to the slit width.
Claim 5
Dependent Claim
23 words
The anchoring element as claimd in claim 4, wherein in that the hole or holes have any other appropriate form, e.g. are oval.
Claim 6
Dependent Claim
30 words
The anchoring element as claimed in any of claims 1 to 4, wherein the centred bore of the element widens in direction of the inner end of the element 1.
Claim 7
Dependent Claim
15 words
The anchoring element as claimed in claim 6, wherein the the widening is substantially conical.
Claim 8
Dependent Claim
33 words
The anchoring element as claimed in claim 6 or 7, wherein the anchoring element lacks bridges between the spiral slits in its portion widening in direction of the inner end of the element.
Claim 9
Dependent Claim
41 words
The anchoring element as claimed in any of claims 1 to 7, wherein the inner end of the element has the form of an intersected annular edge, the radius of which substantially corresponds to the inner diameter of the external threads.
Claim 10
Dependent Claim
20 words
The anchoring element as claimed in any of claims 1 to 9, wherein a number of spiral slits are arranged.
Claim 11
Dependent Claim
65 words
The anchoring element as claimed in any of claims 1 to 10, wherein the number of spiral slits is two or three or a multiple of two, the slits in each pair of slits being arranged opposite to each other in respect of the centre bore axis and all slits positioned adjacent to each other being equidistant in all intersectional planes perpendicular to said axis.
Claim 12
Dependent Claim
30 words
The anchoring element as claimed in claim 11, wherein the area occupied by slits in said portion of the anchoring element provided with slits is between 15 and 50 %.
Claim 13
Dependent Claim
24 words
The anchoring element as claimed in any of claims 1 to 12, wherein the outer wall portion bordering the inner end lacks external threads.
Claim 14
Dependent Claim
21 words
The anchoring element as claimed in any of claims 1 to 13, wherein its inner end portion is somewhat radially resilient.
Claim 15
Dependent Claim
38 words
The anchoring element according to any preceding claim, wherein the fixation means for a prosthesis or a part of a prosthesis comprise internal threads arranged in the centred bore at the outer end portion of the anchoring element.
Claim 16
Dependent Claim
51 words
The anchoring element according to any preceding claim, wherein the element also has a bore in its outer end portion, said bore tilting in respect of the centre axis by an angle β of between 25 and 65° to provide for passage of a nerve or a feeding means or similar.
Claim 17
Dependent Claim
33 words
The anchoring element according to any preceding claim, wherein the ratio between the pitch of exterior threads and the pitch of each spiral groove is between 20:1 and 500: 1, preferably about 100:1.
Claim 18
Dependent Claim
71 words
The anchoring element according to any preceding claim, wherein the element, at least in its parts being in contact with tissue upon implantation, is of titanium or other tissue-friendly material and that the element, at least in regard of the portion of its surface having tissue contact upon implantation, has a micropitted surface with a the pit diameter of between 10 and 1 000 nm, preferably between 10 - 300 nm.
Claim 19
Dependent Claim
20 words
The use of the anchoring element according to any preceding claim for supporting prostheses or parts thereof in bone tissue.
Claim 20
Independent Claim
209 words
A method for anchoring an anchoring element for prostheses or parts of prostheses in bone tissue, said anchoring element having a hollow centre and being provided with external threads and self-tapping means, said method comprising - production of a hole in bone tissue, the diameter of said hole approximately corresponding to the inner diameter of the external threads of the anchoring element, said hole having a length adapted to the insertion depth of the element, - insertion of the element into the hole by self-tapping screwing-on while removing bone material by ablation and thereby forming threads in the bone material, said threads corresponding to the external threads of the anchoring element, whereby the removed bone material is received by one or several grooves provided in the outer wall of the anchoring element and is transported in the grooves in the direction of the outer end portion of the anchoring element, and anchoring the element in the bone by cooperation of its external threads with the threads cut into the bone tissue, - fixation of a prosthesis or a part of a prosthesis to the outer end of the anchoring element, said fixation being carried out in direct connection with the implantation of the element or a short time thereafter.
Claim 21
Dependent Claim
27 words
A method according to claim 20, wherein the element is inserted into the hole made in bone tissue by a guide element passing through the centred bore.
Claim 22
Dependent Claim
50 words
A method according to claim 20, further comprising - post-implantation supply of pharmacologically active agents, such as agents promoting integration by the healing process, bactericides, bone marrow, etc., through the centred bore of the anchoring element to the bone tissue area provided with the hole for implantation of the element.
References Cited (Backward Citations)
No citation records indexed.
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