Device to fill a bone void whilst minimising pressurisation

1. An implantable device for insertion into a bone void, the implantable device comprising a bone substitute material and having a cylindrical body and one or more longitudinal channels extending the entire length of the device, where said one or more longitudinal channels allows for depressurisation of the bone void during implantation of the device; the one or more longitudinal channels each intersecting a surface of the device and extending to an axial centerline thereof, and being tapered such that the width of the one or more longitudinal channels opening on an outer, circumferential edge of the implantable device is greater than its width at a base thereof; and wherein the devices have a flat surface on an opposing longitudinal side to the one or more longitudinal channels; and wherein the device has convex, domed or semispherical shaped ends.

2. An implantable device according to claim 1 , wherein the one or more longitudinal channels allows for the displacement and/or exit of the void contents.

3. An implantable device according to claim 1 , wherein the one or more longitudinal channels tapers in width from the exterior circumference towards its central axis.

4. An implantable device according to claim 3 , wherein the one or more longitudinal channels has a taper angle of 10 degrees to 145 degrees.

5. An implantable device according to claim 4 , wherein the taper angle of one or more longitudinal channels is from 20 degrees to 50 degrees.

6. An implantable device according to claim 1 , wherein an opposing surface to one or more longitudinal channels has a flat surface.

7. An implantable device according to claim 1 , wherein the device has a capsule shape, having one or more longitudinal channel intersecting the surface of the device and extending the full length of the device and also extending towards the device centreline.

8. An implantable device according to claim 1 , wherein the displacement of the void contents minimises an increase in pressure within the void.

9. An implantable device according to claim 1 , wherein the bone substitute material comprises a calcium-based bone substitute material.

10. An implantable device according to claim 1 , wherein the implantable device is adapted for insertion into a void that is within an intramedullary canal of a patient.

11. An implantable device according to claim 10 , wherein the implantable device is adapted for insertion into a void comprising a defect in bone.

12. An arrangement of two or more implantable devices comprising a plurality of the devices lined up end to end, wherein each of the implantable devices comprises a bone substitute material and has a cylindrical body and one or more longitudinal channels extending the entire length of the device, where said one or more longitudinal channels allows for depressurisation of the bone void during implantation of each device; the one or more longitudinal channels each intersecting a surface of each device and extending to an axial centerline thereof, and being tapered such that the width of the one or more longitudinal channels opening on an outer, circumferential edge of each implantable device is greater than its width at a base thereof; and wherein the devices have a flat surface on an opposing longitudinal side to the one or more longitudinal channels; and wherein each device has convex, domed or semispherical shaped ends.

13. An arrangement according to claim 12 , wherein the longitudinal channels are axially aligned with each other.

14. An arrangement according to claim 12 , wherein the longitudinal channels are not axially aligned with each other.

15. An arrangement according to claim 12 , wherein the arrangement is adapted for insertion into an intramedullary canal of a patient.

16. An implantable device according to claim 1 , wherein the one or more longitudinal channels extend the full length of the device.