Rod-shaped implant, in particular for spinal stabilization, method and tool for producing the same

1. A combination comprising a rod-shaped implant for spinal stabilization and a tool for producing the rod-shaped implant,

wherein the rod-shaped implant comprises:

a first component comprising a first material, the first component having a first end and a second end spaced from the first end;

a second component connected to the first component and comprising a second material different from the first material, the second component extending from the second end of the first component in a direction away from the first end of the first component;

wherein at least the first material is a plastic material;

wherein the connection between the first component and the second component consists of a melted connection; and

wherein the first component and the second component are injection molded; and

wherein the tool comprises:

a first tool part with a first cavity for forming the first component of the rod-shaped implant;

a second tool part with a second cavity for forming the second component of the rod-shaped implant; and

a stop;

wherein when the first tool part and the second tool part are assembled together, the first cavity and the second cavity respectively have openings facing one another, and the stop is moveable between a first position where one of the first cavity or the second cavity is isolated from the other one of the first cavity or the second cavity, and a second position where the first cavity and the second cavity are connected and define a shape of the rod-shaped implant; and

wherein the stop comprises a core configured to form a cavity within one of the components.

2. The combination according to claim 1 , wherein the second component comprises a plastic material which is different from the first material.

3. The combination according to claim 1 , wherein the second component comprises a metal.

4. The combination according to claim 1 , wherein the first component is a first rod and the second component is a second rod, wherein the first rod and the second rod are connected at one of their ends.

5. The combination according to claim 1 , wherein one component surrounds at least a portion of the other component.

6. The combination according claim 1 , wherein one of the components has a portion with an increased surface area for connection with the other component.

7. The combination according to claim 1 , wherein the plastic material comprises stiffening elements.

8. The combination according to claim 7 , wherein the stiffening elements are fibers.

9. The combination according to claim 1 , wherein a cross-sectional shape of the first component is the same as a cross-sectional shape of the second component at the melted connection.

10. The combination according to claim 1 , wherein the tool further comprises:

a first injection nozzle for injecting molten first material into the first cavity to form the first component of the rod-shaped implant; and

a second injection nozzle for injecting molten second material into the second cavity to form the second component of the rod-shaped implant;

wherein the melted connection between the first component of the rod-shaped implant and the second component of the rod-shaped implant is configured to be formed where the openings of the first cavity and the second cavity meet when the first and second tool parts are assembled together.

11. The combination according to claim 1 , wherein when the core is in the first position, the core is positioned in one of the first cavity or the second cavity while protruding into the other one of the first cavity or the second cavity.

12. A method for producing a rod-shaped implant for spinal stabilization by utilizing a tool, the rod-shaped implant comprising a first component comprising a first material, the first component having a first end and a second end spaced from the first end, a second component connected to the first component and comprising a second material different from the first material, the second component extending from the second end of the first component in a direction away from the first end of the first component, wherein at least the first material is a plastic material, wherein the connection between the first component and the second component consists of a melted connection, and wherein the first component and the second component are injection molded, and the tool comprising a first tool part with a first cavity for forming the first component of the rod-shaped implant; a second tool part with a second cavity for forming the second component of the rod-shaped implant; and a stop; wherein when the first tool part and the second tool part are assembled together, the first cavity and the second cavity respectively have openings facing one another, and the stop is moveable between a first position where one of the first cavity or the second cavity is isolated from the other one of the first cavity or the second cavity, and a second position where the first cavity and the second cavity are connected and define a shape of the rod-shaped implant; and wherein the stop comprises a core configured to form a cavity within one of the components, the method comprising:

injection molding the first component;

injection molding the second component; and

connecting the first component and the second component by melting the first component to the second component.

13. The method according to claim 12 , wherein the second material is a plastic material which is different from the first material.

14. The method according to claim 13 , wherein the first component is welded to the second component.

15. A tool for producing a rod-shaped implant for spinal stabilization, the tool comprising:

a first tool part with a first cavity for forming a first component of a rod-shaped implant;

a second tool part with a second cavity for fonning a second component of a rod-shaped implant; and

a stop;

wherein when the first tool part and the second tool part are assembled together, the first cavity and the second cavity respectively have openings facing one another, and the stop is moveable between a first position where one of the first cavity or the second cavity is isolated from the other one of the first cavity or the second cavity, and a second position where the first cavity and the second cavity are connected and define a shape of a rod-shaped implant; and

wherein the stop comprises a core, and wherein when the core is in the first position, the core is positioned in one of the first cavity or the second cavity while protruding into the other one of the first cavity or the second cavity.

16. The tool according to claim 15 , further comprising:

a first injection nozzle for injecting molten first material into the first cavity to form a first component of a rod-shaped implant; and

a second injection nozzle for injecting molten second material into the second cavity to form a second component of a rod-shaped implant;

wherein a connection between a first component and a second component of a rod-shaped implant is configured to be formed where the openings of the first cavity and the second cavity meet when the first and second tool parts are assembled together.