ZA200504001B - Implant for fixing bones - Google Patents
Implant for fixing bones Download PDFInfo
- Publication number
- ZA200504001B ZA200504001B ZA200504001A ZA200504001A ZA200504001B ZA 200504001 B ZA200504001 B ZA 200504001B ZA 200504001 A ZA200504001 A ZA 200504001A ZA 200504001 A ZA200504001 A ZA 200504001A ZA 200504001 B ZA200504001 B ZA 200504001B
- Authority
- ZA
- South Africa
- Prior art keywords
- implant
- accordance
- perimeter
- plastic
- bone
- Prior art date
Links
- 239000007943 implant Substances 0.000 title claims description 57
- 210000000988 bone and bone Anatomy 0.000 title claims description 42
- 239000004033 plastic Substances 0.000 claims description 30
- 229920003023 plastic Polymers 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 229920002530 polyetherether ketone Polymers 0.000 claims description 10
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 229920006260 polyaryletherketone Polymers 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910052588 hydroxylapatite Inorganic materials 0.000 claims description 2
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims 2
- 230000004048 modification Effects 0.000 claims 1
- 238000012986 modification Methods 0.000 claims 1
- 230000035876 healing Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000006044 Wolff rearrangement reaction Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Landscapes
- Prostheses (AREA)
- Materials For Medical Uses (AREA)
Description
1975/PCT 29.11.2002
English translation of the PCT Application No. PCT/CH02/00650
Impiant for bone fixation
The invention relates to an implant for use in bone fixation, specifically a bone plate according to the generic term of Patent Claim 1.
Bone plates made either of metals or metal alloys or of plastic materials, specifically resorbable polymers, are already state of the art. Metallic bone plates are, however, either too rigid, and the less rigid plastic plates, specifically plates made of resorbable plastics, do not provide the necessary strength. In addition, problems also occur when plastic plates are joined to metallic bone screws, specifically the joints in such cases are not always sufficiently stable.
The invention is intended to remedy this situation. The invention is based on the task of creating an implant that is, on the one hand, not too rigid and, on the other hand, does not present problems as regards the screw-implant interface.
The invention solves the set task by providing an implant with the features of claim 1.
In one embodiment of the implant, the perimeter is ring-shaped or sleeve-shaped. The external form of the perimeter can, however, also be designed with a polygonal, e.g. rectangular, shape.
The implant is preferably formed as a bone plate, with a bottom side and an upper side suitable for the bone contact, wherein the passages connect the upper side with the bottom side.
The perimeter is preferably made of a metal or a metal alloy and the material surrounding the perimeter is preferably a plastic. In this way, the plate will not have to bear the same load. The plate is also less rigid, which leads to improved healing of the bone in accordance with Wolffs law, and finally it is also less radio opaque, which means that less artefacts appear in the x-ray pictures, CT or MRI, which in turn allows enhanced monitoring of the healing process.
The perimeter can, however, also be made of a plastic, and the material surrounding the perimeter can be a metal or a metal alloy.
Suitable plastics are above all PEEK or some related polymers from the : Polyaryletherketone (PAEK) family. The plastic can moreover also be reinforced, e.g. with carbon fibres or PEEK fibres.
Suitable metals are, for example, titanium, titanium alloys or implant steel.
The elements of the implant made of plastic are preferably covered with a coating of titanium or a Hydroxylapatite layer. The advantage of such coating is that it prevents all direct contact between metal and bone, while at the same time achieving the same surface as with a metal plate, but nevertheless has the mechanical features of a plastic.
In a special embodiment, the perimeter is provided with a sleeve-shaped extension suitable as a target aid for a bone fixation device. The extension can be formed on the perimeter and both — perimeter and sleeve-shaped extension - are preferably made of plastic.
One particularly simple realisation of the implant is when the perimeter is made of metal or a metal alloy and is set lowered in the plastic surrounding the perimeter, vis-a-vis the upper side. Alternately, the perimeter can be set higher in the surrounding plastic, vis-a- vis the upper side.
The level containing or lying on the perimeter can in one embodiment form an angle in the range 0.1° to 20.0° to the plate level, so that the passages (or the axles of the passages) will then also be able to form such an angle vis-a-vis the verticals on the plate level.
In one embodiment, the implant — specifically when this entails a bone plate - is provided with at least two passages running through the implant, which are suitable for receiving a bone fixation device, specifically a bone screw.
In a further embodiment, at least two of the passages running through the implant are provided with a peripheral perimeter that is made of a different material than the implant material surrounding the perimeter.
The peripheral perimeters will then preferably be linked to each other in one piece by several passages running through the implant, which allows both simple manufacture of the implant and improved anchoring of the perimeters in the surrounding plastic material.
In a further embodiment, the peripheral perimeters are securely linked to the implant.
This results in enhanced stability and simplified handling of the implant compared to removable peripheral perimeters.
When there are several peripheral perimeters, these can also be joined together in the form of a grid.
The implant can be fixed to the bone to be treated by means of suitable bone fixation devices that can be inserted into the passages, preferably in the form of bone screws.
The bone screws can be inserted in mono-axial or poly-axial direction in relation to the implant. The connection of the bone screws to the implant can be carried out either with a stable or non-stable angle.
The invention and derived forms of the invention shall be described in more detail in the following on the basis of a partially schematic representation of several embodiments.
Fig. 1 shows an overview view of a bone plate made of plastic with four plate drill holes, with a metallic, rectangular perimeter;
Fig. 2 shows a longitudinal section through the bone plate according to Fig. 1 along the line 11-11;
Fig. 3 shows a perspective view of a modified bone plate with sleeve-shaped perimeters;
Fig. 4 shows an overview on the bone plate according to Fig. 3; and
Fig. 5 shows a perspective view of a modified bone plate with a sleeve-shaped extension on one of the plate holes.
The implant 1 illustrated in Fig. 1 and Fig. 2 is a bone plate, the main element of which consists of bio-compatible plastic, e.g. Polyetheretherketone (PEEK), and which is provided with four passages 2 in the form of circular holes with the axle 3 for receiving bone screws (not shown in the illustration). The passages 2 connect the bottom side 5 of the bone plate suitable for attachment to the bone to its upper side 6.
The passages 2 are provided in the form of rectangular dies made of metal, which can be designed as perimeters 4 of the passages 2. The perimeters 4, which can for example be made of titanium, are worked into the surrounding plastic material 7 (e.g.
PEEK) in spray cast according to their manufacture and are connected with positive fit to the plastic material 7.
A variation of the insertion of the perimeter 4 in the plastic material 7 is shown on the right side of Fig. 2, in which the metallic dies are set less high than on the left side of
Fig. 2, so that they are set lowered vis-a-vis the upper side 6 and the bottom side 5, and are therefore surrounding by plastic material 7.
In another embodiment shown in Fig. 3 and Fig. 4, the implant 1 is also a bone plate.
This is made of PEEK, which is reinforced with PEEK fibres. In contrast to the embodiment in accordance with Fig. 1 and Fig. 2, two perimeters 4 made of titanium are joined together as one piece in each case and set into the surrounding PEEK material 7 as spray cast in its entirety. The external form of the different perimeters 4 is thereby circular or sleeve-shaped .
Claims (23)
1. Implant (1) for the bone fixation A) consisting of a combination of the two materials metal and plastic; and B) at least one passage (2) running through the implant (1) with an axle (3) for receiving a bone fixation device; characterised in that C) the passage (2) is provided with a peripheral perimeter (4) that is made of a different material that the implant material (1) surrounding the perimeter (4).
2. Implant (1) in accordance with claim 1, characterised in that the perimeter (4) is ring- shaped or sleeve-shaped.
3. Implant (1) in accordance with claim 1, characterised in that the perimeter (4) is provided with a polygonal external form.
4. Implant (1) in accordance with one of the claims 1 to 3, characterised in that it is formed as a bone plate that is provided with a bottom side (5) and an upper side (6) suitable for the bone contact, wherein the passage (2) connects the upper side (6) to the bottom side (5).
5. Implant (1) in accordance with one of the claims 1 — 4, characterised in that the perimeter (4) is made of a metal or a metal alloy and that the material surrounding the perimeter (4) is plastic.
6. Implant (1) in accordance with one of the claims 1 — 4, characterised in that the perimeter (4) is made of a plastic and that the material surrounding the perimeter (4) is a metal or a metal alloy.
7. Implant (1) in accordance with one of the claims 1 — 6, characterised in that the plastic is chosen from the Polyaryletherketone (PAEK) family.
8. Implant (1) in accordance with one of the claims 1 — 6, characterised in that PEEK is used as plastic.
9. Implant (1) in accordance with one of the claims 1 — 8, characterised in that the plastic is reinforced, preferably with carbon fibres or PEEK fibres.
10. Implant (1) in accordance with one of the claims 1 — 9, characterised in that the metal titanium is a titanium alloy or implant steel.
11. Implant (1) in accordance with one of the claims 1 — 10, characterised in that the elements of the implant that are made of plastic are covered with a coating of titanium or a Hydroxylapatite layer.
12. Implant (1) in accordance with one of the claims 1 — 11, characterised in that the perimeter (4) is provided with a sleeve-shaped extension (8) as target aid for a bone fixation device.
13. Implant (1) in accordance with claim 12, characterised in that the extension (8) is formed on the perimeter (4) and both are made of plastic.
14. Implant (1) in accordance with one of the claims 1 — 12, characterised in that the perimeter (4) is made of a metal or a metal alloy and is set lowered in the plastic surrounding the perimeter (4), vis-a-vis the upper side (6).
15. Implant (1) in accordance with one of the claims 1 — 12, characterised in that the perimeter (4) is made of a metal or a metal alloy and set raised in the plastic surrounding the perimeter (4), vis-a-vis the upper side (6).
16. Implant (1) in accordance with one of the claims 1 — 15, characterised in that the level containing or laid on the perimeter (4) has an angle in the range 0.1° to 20.0° to the plate level.
17. Implant (1) in accordance with one of the claims 1 — 15, characterised in that it is provided with at least two passages (2) running through the implant (1) with an axle (3) for receiving a bone fixation device.
18. Implant (1) in accordance with one of the claims 1 — 17, characterised in that at least two of the passages (2) running through the implant (1) are provided with a peripheral perimeter (4) that is made of a different material than the material of the implant (1) surrounding the perimeter (4).
19. Implant in accordance with one of the claims 1 — 18, characterised in that the peripheral perimeters (4) are joined to each other in one piece by several passages (2) running through the implant (1).
20. Implant in accordance with one of the claims 1 — 19, characterised in that the peripheral perimeters (4) are linked permanently to the implant.
21. Implant in accordance with one of the claims 1 — 20, characterised in that several peripheral perimeters (4) are joined to each other in the form of a grid.
22. Implant in accordance with one of the claims 1 — 21, characterised in that it comprises at least one bone fixation device that can be inserted into the passages (2), preferably a bone screw, which is positioned in poly-axial direction in relation to the implant.
23.Implant in accordance with one of the claims 1 — 21, characterised in that it comprises at least one bone fixation device that can be inserted into the passages (2), preferably a bone screw, which can be connected with the implant with stable angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA200504001A ZA200504001B (en) | 2005-05-18 | 2005-05-18 | Implant for fixing bones |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA200504001A ZA200504001B (en) | 2005-05-18 | 2005-05-18 | Implant for fixing bones |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA200504001B true ZA200504001B (en) | 2006-04-29 |
Family
ID=38137517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA200504001A ZA200504001B (en) | 2005-05-18 | 2005-05-18 | Implant for fixing bones |
Country Status (1)
| Country | Link |
|---|---|
| ZA (1) | ZA200504001B (en) |
-
2005
- 2005-05-18 ZA ZA200504001A patent/ZA200504001B/en unknown
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