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 one of an elongated structure, the structure having a longitudinal slot extending along a substantial portion of its length and 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 implant is formed without any recesses, bevels, or slants, adjacent to the longitudinal slot.

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 the connecting device comprising a pedicle screw having an upper section having a width greater than the width of said slot and an exteriorly threaded portion extending outwardly from said section and extending through said slot.

6. The longitudinal implant and connecting device according to claim 5 , wherein an interiorally threaded nut is received by an outer end of said threaded portion whereby said implant can be grasped between said upper section and said nut to tightly secure said plate by threading said upper section.

7. The longitudinal implant and connecting device according to claim 1 , wherein said connecting device comprises a screw and a nut, each of which is made of titanium.

8. The longitudinal implant and connecting device according to claim 1 , wherein said implant is a plate.

9. The longitudinal implant and connecting device according to claim 1 or 2 , 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.