ZA200202401B - Resorbable bone plate. - Google Patents
Resorbable bone plate. Download PDFInfo
- Publication number
- ZA200202401B ZA200202401B ZA200202401A ZA200202401A ZA200202401B ZA 200202401 B ZA200202401 B ZA 200202401B ZA 200202401 A ZA200202401 A ZA 200202401A ZA 200202401 A ZA200202401 A ZA 200202401A ZA 200202401 B ZA200202401 B ZA 200202401B
- Authority
- ZA
- South Africa
- Prior art keywords
- holes
- bone plate
- plate according
- bone
- longitudinal
- Prior art date
Links
- 210000000988 bone and bone Anatomy 0.000 title claims description 36
- 239000000463 material Substances 0.000 claims description 5
- 210000004872 soft tissue Anatomy 0.000 description 3
- 229920001273 Polyhydroxy acid Polymers 0.000 description 2
- 229920000747 poly(lactic acid) Polymers 0.000 description 2
- -1 polyamidoesters Polymers 0.000 description 2
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Polymers OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 1
- 229920001244 Poly(D,L-lactide) Polymers 0.000 description 1
- 229920002732 Polyanhydride Polymers 0.000 description 1
- 229920000954 Polyglycolide Polymers 0.000 description 1
- 229920000331 Polyhydroxybutyrate Polymers 0.000 description 1
- 229920001710 Polyorthoester Polymers 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 210000002411 hand bone Anatomy 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 210000000236 metacarpal bone Anatomy 0.000 description 1
- 229920001432 poly(L-lactide) Polymers 0.000 description 1
- 229920001308 poly(aminoacid) Polymers 0.000 description 1
- 239000005015 poly(hydroxybutyrate) Substances 0.000 description 1
- 229920002463 poly(p-dioxanone) polymer Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920001610 polycaprolactone Polymers 0.000 description 1
- 239000004632 polycaprolactone Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 239000000622 polydioxanone Substances 0.000 description 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
Description
W
Resorbable bone plate
This invention concerns a bone plate in accordance with the pre-characterising portion of Claim 1.
Bone plates made of titanium have shown that this material has such a bio-compatibility that soft-tissue is adhering thereto which can be in certain situations an undesirable property for bone plates. On the other hand bone plates made of bioresorbable materials usually have insufficient mechanical properties (e.g. stiffness).
The invention as claimed aims at overcoming the problems of adherence of soft-tissue and to optimize shape and function of an resorbable plate given the limitations of the properties of these materials.
The present invention provides a bone plate as defined in Claim 1.
Resorbable materials to be used for the device according to the : invention can be resorbable polymers like highly purified polyhydroxyacids, polysaccharides, polyamines, polyaminoacids, polyorthoesters, polyanhydrides, polyamidoesters, polydioxanone,
polyesteramides, copolyoxalates, polycarbonates or poly- (glutamic-co-leucine). Preferably polylactides are used or their combinations with polyhydroxybutyrates or polyhydroxy- valerates and/or resorbable glasses.
Other useful polyhydroxyacids comprise polycaprolactone, poly (L-lactide), poly (DL-lactide), polyglycolide, poly- (DL-lactide-~-co-glycolide), poly (DL-lactide-co-caprolactone).
Preferably the lower surface of the bone plate has a radius of curvature R which is smaller than 9 mm. The axis of the hollow cylinder corresponding to the curved plate is running parallel to the central longitudinal axis of the plate.
The ratio F/d of the total area F of the upper surface (including the surface area of the through holes) to the thickness d of the plate is in the range of 210 to 240 mm.
Preferably the ratio F/f of the total area F of the upper surface (including the surface area of the through holes) to the true surface f£ of the upper surface (excluding the surface area of the through holes) is in the range of 1,10 - 1,25.
The width of the free ends of the longitudinal plate is narrowing to value b being preferably smaller than 0,15 B.
The upper surface of the bone plate has preferably a roughness of 0,5 pum to 5,0 um, typically of 0,6 um to 2,5 um.
% in order to avoid the adherence of soft tissue after implantation. In any case it is preferred that the upper surface is smoother than the lower surface.
RS
Preferably the bone plate is provided with a torsion around its central longitudinal axis which allows application to the required bone profile. The degree of torsion of the bone plate is preferably between x 1° to + 20° over the total length.
The length 1 of the central part of the longitudinal plate corresponds preferably to 73 - 82 % of the total length L of the plate.
In order to achieve better angular stability selected or all of the conical through holes may be provided with a thread.
However, it is also possible to use through holes with a smooth inner surface.
The through holes have preferably a cone angle of 15° to 25°, typically of 18° to 22°.
The bone plate is provided preferably with n = 4 holes (more preferably with n > 6 holes), whereby the two most centrally located holes have preferably a distance which is at least 15C : %, preferably 180 % of the distance x between the other througt. ) holes. When the central part of the plate is reinforced by
BN) omitting the most central hole (or holes) maximum rigidity of the cross section is obtained which is important for the bridging of bone defects.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming part of this disclosure. For the better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawings, examples and descriptive matter in which are illustrated and described preferred embodiments of the invention.
In the drawings:
Fig. 1 is a view in elevation of the bone plate according to the invention; and
Fig. 2 is a section along line A-A of Fig. 1;
Figure 1 shows a bone plate of longitudinal shape having an upper curved surface 1, a curved lower surface 2 for contacting a long bone, e.g. a metacarpal bone, six conical through holes 3 connecting the upper surface 1 with the lower surface 2 fer receiving bone screws and a central longitudinal axis 4.
The through holes 3 have a cone angle of 20° and a minimum diameter D of 2,8 mm located at the lower side 2.
© WO 01/41663 PCT/CH99/00582
SE
The lower surface 2 has a radius of curvature R of 7 mm. The - plate consists of polylactide copolymer with an enhanced } degradation rate.
E The ratio F/d of the total area F of the upper surface 1 (including the surface area of the through holes 3) to the thickness d of the plate has the value of 223 mm.
The ratio F/f of the total area F of the upper surface 1 including the surface area of the through holes 3 to the true surface f of the upper surface 1 excluding the surface area of the through holes 3 has the value of 1,17.
The central part of the longitudinal plate (over the length 1 in
Fig. 1) has a constant width B whereas the width of the free ends of the longitudinal plate is narrowing gradually to value O in the form of a hemi-circle. The length 1 of the central part of the longitudinal plate corresponds to 77 % of the total length L of the plate.
Claims (2)
1. Bone plate of longitudinal shape having an upper surface, a curved lower surface for contacting a bone, a plurality of conical through holes connecting the upper surface with the lower surface for receiving bone screws, a central longitudinal axis and consisting of a resorbable material, characterized in that A) the curved lower surface has a radius of curvature R which is smaller than 10 mm; B) the ratio F/d of the total area F of the upper surface including the surface area of the through holes to the thickness d of the plate is in the range of 190 to 270 mm; and C) the central part of the longitudinal plate has a generally constant width B whereas the width of the free ends of the longitudinal plate is narrowing to value b < 0,3 B.
2. Bone plate according to claim 1, characterized in that the radius of curvature R is smaller than 9 mm.
3. Bone plate according to claim 1 or 2, characterized in that the ratio F/d is in the range of 210 to 240 mm.
4. Bone plate according to one of the «claims 1 to 3, characterized in that the ratio F/f of the total area F of the upper surface including the surface area of the through holes to the true surface f of the upper surface excluding the surface area cf the through holes is in the range of 1,10 - 1,25. AMENDED SHEET
- a © WO 01/41663 PCT/CH99/00582
5. Bone plate according to one of the «claims 1 to 4, characterized in that the width of the free ends of the longitudinal plate is narrowing to value b < 0,15 B.
6. Bone plate according to one of the «claims 1 to 5, characterized in that the upper surface has a roughness of 0,5um to 5,0.
7. Bone plate according to one of the «claims 1 to 5, characterized in that the upper surface has a roughness of 0,6 um to 2,5 pum. ’
8. Bone plate according to one of the «claims 1 to 7, characterized in that the upper surface is smoother than the lower surface.
9. Bone plate according to one of the «claims 1 to 7, characterized in that the plate is provided with a torsion around its central longitudinal axis.
10. Bone plate according to one of the «claims 1 to 9, characterized in that the length 1 of the central part of the longitudinal plate corresponds to 73 - 82 % of the total length L of the plate. AMENDED SHEET
- A
11. Bone plate according to one of the claims 1 to 10, characterized in that conical through holes are provided with a thread.
12. Bone plate according to one of the claims 1 to 10, characterized in that conical through holes have a smooth inner surface.
13. Bone plate according to one of the claims 1 to 12, characterized in that it is provided with n > 4 holes, preferably n > 6 holes, and that the two most centrally located holes have a distance which is at least 102 % of the distance x between the other holes.
14. Bone plate according to any one of the claims 1 to 12, characterized in that it is provided with n > 6 holes, and that the two most centrally located holes have a distance which is of 150 % to 180 % of the distance between the other holes.
15. Bone plate according to one of the claims 1 to 14, characterized in that the through holes have a cone angle of 15° to 25°.
le. Bone plate according to one of the «claims 1 to 14, characterized in that the through holes have a cone angle of 18° to 22°. AMENDED SHEET
EY > pe
17. Bone plate substantially as herein described with reference to figures 1 and 2. AMENDED SHEET
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA200202401A ZA200202401B (en) | 2002-03-26 | 2002-03-26 | Resorbable bone plate. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA200202401A ZA200202401B (en) | 2002-03-26 | 2002-03-26 | Resorbable bone plate. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA200202401B true ZA200202401B (en) | 2003-02-26 |
Family
ID=27758246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA200202401A ZA200202401B (en) | 2002-03-26 | 2002-03-26 | Resorbable bone plate. |
Country Status (1)
| Country | Link |
|---|---|
| ZA (1) | ZA200202401B (en) |
-
2002
- 2002-03-26 ZA ZA200202401A patent/ZA200202401B/en unknown
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