Hybrid intramedullary rods

1. An intramedullary rod, comprising:

a head member having a proximal head member end, a distal head member end, a head member distal extension defining a head member cavity, a head member lumen extending between the proximal head member end and the distal head member end, and a head member outer surface, a first opening on a first axial side of the head member, a second opening on a second axial side of the head member, and a passageway extending between the first opening and the second opening;

a shaft member having a shaft member proximal end disposed within the head member cavity, the shaft member having a proximal shaft member opening, a distal shaft member opening, and defining a shaft member lumen extending between the proximal shaft member opening and the distal shaft member opening, the shaft member lumen positioned in line with the head member lumen; and

an outer body member disposed circumferentially around the shaft member and a portion of the head member, the outer body member defining an outer body member opening disposed over the first opening of the head member;

wherein the outer body member does not extend into the first opening of the head member.

2. The intramedullary rod of claim 1 , wherein the outer body member opening has a first inner diameter and the first opening of the head member has a second inner diameter; and

wherein the first inner diameter is different than the second inner diameter.

3. The intramedullary rod of claim 2 , wherein the first inner diameter is less than the second inner diameter.

4. The intramedullary rod of claim 1 , wherein the outer body member opening extends completely around the first opening of the head member.

5. The intramedullary rod of claim 1 , wherein the outer body member has an outer body member distal end that defines a first outer body member locking screw passageway that extends through the outer body member.

6. The intramedullary rod of claim 5 , wherein the shaft member has a shaft member distal end that defines a first shaft member locking screw passageway that aligns with the first outer body member locking screw passageway.

7. The intramedullary rod of claim 6 , wherein the first shaft member locking screw passageway has a first inner diameter and the first outer body member locking screw passageway has a second inner diameter; and

wherein the first inner diameter is the same as the second inner diameter.

8. The intramedullary rod of claim 6 , wherein the first shaft member locking screw passageway has a first inner diameter and the first outer body member locking screw passageway has a second inner diameter; and

wherein the first inner diameter is larger than the second inner diameter.

9. The intramedullary rod of claim 5 , wherein the outer body member distal end defines a second outer body member locking screw passageway that extends through the outer body member; and

wherein the shaft member distal end defines a second shaft member locking screw passageway that aligns with the second outer body member locking screw passageway.

10. The intramedullary rod of claim 1 , wherein the shaft member is anodized.

11. The intramedullary rod of claim 10 , wherein the shaft member comprises a titanium alloy.

12. The intramedullary rod of claim 11 , wherein the outer body member comprises PEEK.

13. The intramedullary rod of claim 11 , wherein the outer body member comprises a carbon fiber reinforced polymer.

14. The intramedullary rod of claim 13 , wherein the outer body member comprises CFR PEEK.

15. The intramedullary rod of claim 1 , wherein the outer body member extends axially beyond the shaft member proximal end.

16. An intramedullary rod, comprising:

a head member defining a recess, a first opening having a first inner diameter, a second opening, and a passageway extending between the first and second openings;

a shaft member partially disposed within the recess of the head member; and

an outer body member disposed circumferentially around the shaft member and a portion of the head member, the outer body member defining a third opening disposed adjacent the first opening of the head member and providing access to the passageway, the third opening having a second inner diameter that is less than the first inner diameter;

wherein the outer body member does not extend into the first opening of the head member.

17. The intramedullary rod of claim 16 , wherein the shaft member is anodized.

18. The intramedullary rod of claim 17 , wherein the shaft member comprises a titanium alloy.

19. The intramedullary rod of claim 18 , wherein the outer body member comprises a carbon fiber reinforced polymer.

20. A method of manufacturing an intramedullary rod, comprising:

forming a shaft member from a precursor;

securing the shaft member to a head member defining a recess, a first opening having a first inner diameter, a second opening, and a passageway extending between the first and second openings; and

overmolding the shaft member with a PEEK-Carbon composite material to form an intramedullary rod having an outer body member disposed circumferentially about the shaft member and around the first opening of the head member;

wherein the outer body member does not extend into the first opening of the head member.