Method of osteosyntheses or arthrodesis of two-bone parts, in particular of the hand and / or foot

1. A fixation device comprising:

a median zone having a substantially triangular shape;

a first fixation zone including first and second tabs that, in a separated configuration, extend away from each other from an end of the median zone, the first fixation zone having a first region adjacent the median zone and a second region adjacent the first region;

wherein, within the first region of the first fixation zone, an inner surface of each of the first and second tabs of the first fixation zone extends outwardly and proximally from the median zone to a first point on each of the first and second tabs to form an arch extending continuously from the first point on the first tab to the first point on the second tab, and from each of the first points, the inner surface of each of the first and second tabs extends toward a second point, and

within the second region of the first fixation zone, the inner surface of each of the first and second tabs of the first fixation zone extends outwardly from each second point to a respective third point so that the inner surface of each of the first and second tabs from the second point to the third point is arcuate and convex.

2. The device of claim 1 , wherein each tab in a first fixation zone includes at least one outwardly projecting barb adapted to engage bone, the barb including a decline toward the distal end of the fixation device.

3. The device of claim 1 , further comprising a generally rectangular connecting zone adjacent the median zone.

4. The device of claim 1 , further comprising a second fixation zone including first and second tabs extending outwardly in a proximal direction away from a distal tip.

5. The device of claim 4 , wherein the second fixation zone is positioned at one end of the median zone and the first fixation zone is positioned at an opposite end of the median zone, wherein both the first and second tabs of the second fixation zone and the first and second tabs of the first fixation zone extend proximally.

6. The device of claim 1 , wherein the first and second tabs of the first fixation zone comprise a first width in the separated position.

7. The device of claim 6 , wherein the first and second tabs of the first fixation zone comprise a second width in an implantable position that is narrower than this first width.

8. The device of claim 4 , wherein the first and second tabs of the second fixation zone have a first width in an open position.

9. The device of claim 8 , wherein the first and second tabs of the second fixation zone have a second width in an implantable position that is narrower than the first width.

10. A fixation device comprising:

a body extending between a proximal end and a distal end including a proximal fixation zone, a distal fixation zone and a median zone positioned between the proximal and distal fixation zones, the proximal fixation zone including a first tab and a second tab that, in a separated zone, extend from a proximal end of the median zone in a radially outward direction to a first tab end and a second tab end,

wherein an inner surface of the first and second tabs forms a first length extending from adjacent the median zone to a first point on each of the first and second tabs with an increasing slope along the first length, forms a second length along each of the first and second tabs with a decreasing slope from the first point to a second point, and forms a third length along each of the first and second tabs with an increasing slope from the second point to the respective first tab end and second tab end.

11. The device of claim 10 , wherein the decreasing slope from the first point to the second point defines a concave surface.

12. The device of claim 10 , wherein the increasing slope from the second point to the first and second tab ends defines a convex surface.

13. The device of claim 10 , wherein the first tab end and second tab end each form an apex of each of the first and second tabs and, from the apex, the inner surface of each tab extends to a barb positioned on an outer surface of each of the first and second tabs.

14. The device of claim 10 , wherein the distal fixation zone includes a first tab and a second tab extending in a radially outward direction from a distal-most end towards the median zone.

15. The device of claim 14 , wherein the first and second tabs of the proximal fixation zone and the first and second tabs of the distal fixation zone both extend radially outwards in a proximal direction.

16. The device of claim 15 , further comprising a generally rectangular connecting zone positioned between the median zone and the distal fixation zone.

17. A fixation device comprising:

a monolithic body extending between a proximal end and a distal end including a proximal fixation zone, a distal fixation zone and a median zone positioned between the proximal and distal fixation zones, the proximal fixation zone including a first tab and a second tab, the first and second tabs each having a first region adjacent a second region, and the distal fixation zone including a first tab and a second tab extending in a radially outward direction from a distal-most end towards the median zone,

wherein the proximal fixation zone has an open position, in the open position an inner surface of the first region of the first and second tabs forms a convex surface and an inner surface of the second region of the first and second tabs forms a concave surface.

18. The fixation device of claim 17 , wherein the proximal fixation zone has an implantable position, in the implantable position the inner surface of the second region of the first and second tabs is substantially linear.

19. The fixation device of claim 17 , wherein the convex surface is proximal to the concave surface.

20. The fixation device of claim 17 , wherein the inner surface of the first region of the first and second tabs forms an arch.