Rod for spinal fixture, and spinal fixture comprising same
Provided is a fixture rod having improved bonding strength between a core member and a reinforcing fiber layer, high rigidity, and high durability against a deformation load. The fixture rod according to one embodiment of the present disclosure comprises: a core member containing fibers; and a reinforcing fiber layer provided on the core member, and a part of the fibers of the core member is exposed from the core member, and a part of the fibers with the exposed part is embedded in the reinforcing fiber layer.
1 . A fixture rod comprising:
a core member containing fibers and having one elongate recess or a plurality of elongate recesses formed on an outer surface of the core member, a depth of the one recess or each of the plurality of recesses is in a range of from 3 μm to 200 μm; and
a reinforcing fiber layer provided on the core member, the reinforcing fiber layer covering the one elongate recess or the plurality of elongate recesses,
the fibers of the core member comprise long fibers, and a portion of the long fibers each have an end portion that is exposed from a radially facing surface of the core member and have a part that is embedded in the reinforcing fiber layer.
2 . The fixture rod according to claim 1 , wherein the fibers of the core member further comprise short fibers.
3 . The fixture rod according to claim 1 , wherein the fibers of the core member further comprise fibers whose end portion are exposed from a longitudinally facing surface of the core member.
4 . The fixture rod according to claim 1 , wherein the fibers of the core member are carbon, glass, aramid, boron, or SiC.
5 . The fixture rod according to claim 1 , wherein the one elongate recess or the plurality of elongate recesses have a longest dimension that extends in a circumferential direction of the core member.
6 . The fixture rod according to claim 1 , wherein the one elongate recess or the plurality of elongate recesses have a longest dimension that extends in an axial direction of the core member.
7 . The fixture rod according to claim 1 , wherein the one elongate recess or the plurality of elongate recesses have a longest dimension that extends in a direction inclined with respect to a circumferential direction of the core member.
8 . The fixture rod according to claim 1 , wherein the core member comprises the plurality of elongate recesses, and two or more slongate recesses of the plurality of elongate recesses have a longest dimension that extends in different directions.
9 . The fixture rod according to claim 1 , wherein the core member contains a resin, and the resin being any of epoxy, phenol, unsaturated polyester, PA, PC, PPSU, POM, PP, PE, ABS, PS, PAEK, or PEEK.
10 . The fixture rod according to claim 1 , wherein the reinforcing fiber layer contacts and is bonded to the outer surface of the core member where the one elongate recess or the plurality of elongate recesses are formed.
11 . A spinal fixture that is configured to be fixed to a spine and comprises the fixture rod according to claim 1 and a screw.