Longitudinal implant

1. A longitudinal implant and connecting device wherein said longitudinal implant is fastenable to bones on either side of a damaged area through said connecting device, said implant and connecting device comprising:

a longitudinal implant made of a filament or fiber composite material, wherein filaments or fibers in said material are oriented to resist biomechanical forces, and

a connecting device made of a material harder than said longitudinal implant,

wherein, said connecting device is operative to squeeze and lock the longitudinal implant into position both by depression caused by a squeezing and increased friction between the harder material of the connecting device and the composite material of the longitudinal implant, and

wherein the implant is a rod or a rail, the rod or rail formed without any openings or slots, wherein filaments or fibers are aligned lengthwise, so that compression will not change their strength characteristics to any extent even when compressed, and

wherein the rod or rail is formed without any recesses, bevels, or slants, and

wherein the filaments are woven, comprising first filaments that are oriented in the axial direction of the implant, and second filaments that are oriented perpendicular to the axial direction of the implant.

2. The longitudinal implant and connecting device according to claim 1 , wherein the longitudinal implant is made of a carbon filament composite material.

3. The longitudinal implant and connecting device according to claim 1 or 2 , wherein the filaments are encapsulated in a polymer matrix.

4. The longitudinal implant and connecting device according to claim 3 , wherein the filaments are encapsulated in PEEK or PEKEKK.

5. The longitudinal implant and connecting device according to claim 1 , wherein said connecting device comprises a screw.

6. The longitudinal implant and connecting device according to claim 1 , wherein said rail has a rectangular cross section.