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A hearing prosthesis including an actuator. The actuator includes a material that deforms in response to an electrical signal and that is adapted to, upon implantation in a recipient, transmit vibrations representative of a sound signal to an organ of the recipient, wherein the material is at least

A hearing prosthesis including an actuator. The actuator includes a material that deforms in response to an electrical signal and that is adapted to, upon implantation in a recipient, transmit vibrations representative of a sound signal to an organ of the recipient, wherein the material is at least partially exposed to at least one of body tissue and fluid of the recipient.

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1. A hearing prosthesis comprising: an actuator including a material that deforms in response to an electrical signal, wherein the actuator is adapted to, upon implantation in a recipient such that at least a portion of the material is adapted to directly contact bone of the recipient:osseointegrate

1. A hearing prosthesis comprising: an actuator including a material that deforms in response to an electrical signal, wherein the actuator is adapted to, upon implantation in a recipient such that at least a portion of the material is adapted to directly contact bone of the recipient:osseointegrate with the bone of the recipient; andtransmit vibrations representative of a sound signal directly to the bone of the recipient,wherein, the material is a piezoelectric material, and the material is substantially devoid of non-biocompatible substances. 2. The hearing prosthesis of claim 1, wherein the material is substantially devoid of lead zirconate titanate. 3. The hearing prosthesis of claim 1, wherein the material comprises one or more sheets of piezoelectric material. 4. The hearing prosthesis of claim 1, wherein the material includes at least one of hydroxyapatite, strontium and calcium. 5. The hearing prosthesis of claim 1, wherein the material is a composite material comprising a plurality of materials. 6. The hearing prosthesis of claim 5, wherein the composite material comprises barium titanate and tin. 7. The hearing prosthesis of claim 1, wherein a surface of the material has a coating thereon. 8. The hearing prosthesis of claim 7, wherein the coating comprises at least one of silicone, hydroxyapatite and titanium. 9. The hearing prosthesis of claim 7, wherein the coating is configured to substantially prevent osseointegration of coated portions. 10. The hearing prosthesis of claim 1, wherein the actuator is adapted to be implanted such that the at least a portion of the material directly contacts a skull of the recipient. 11. The hearing prosthesis of claim 1, wherein the actuator includes: a first surface formed by the at least a portion of the material, the first surface being adapted to directly contact and osseointegrate with a skull of the recipient via osseointegration, the first surface having a first surface roughness; anda second surface formed by the material located away from the first surface, the second surface having a second surface roughness, the first surface roughness being more rough than the second surface roughness. 12. The hearing prosthesis of claim 11, wherein the first surface roughness is significantly more rough than the second surface roughness such that the first surface roughness accelerates the osseointegration of the at least a portion of the material to the skull at the first surface relative to that which would take place if the first surface had the second surface roughness. 13. The hearing prosthesis of claim 1, wherein the material is lithium niobate and/or lithium tantalate. 14. The hearing prosthesis of claim 1, wherein the material is a material that enhances osseointegration. 15. The prosthesis of claim 1, wherein the prosthesis is a direct acoustic cochlear stimulator, and wherein the material is configured to be mechanically coupled to a cochlea of the recipient. 16. The prosthesis of claim 1, wherein the prosthesis is a middle ear implant, and wherein the material is configured to directly contact and couple to an element of a middle ear of the recipient. 17. The prosthesis of claim 1, wherein the material is configured to directly contact and attached to one or more structures of an ossicular chain of the recipient. 18. The prosthesis of claim 1, wherein the prosthesis is configured to be implanted inside a cochlea of the recipient and configured to be mechanically coupled to the inside of the cochlea. 19. The prosthesis of claim 1, wherein the actuator is in the form of a disk made from the material that deforms in response to an electrical signal having an outer diameter and a thickness. 20. The prosthesis of claim 19, wherein the disk has a thickness between 1 mm and 10 mm and has an outer diameter of between 20 mm and 50 mm. 21. The hearing prosthesis of claim 1, wherein the material is adapted to, upon implantation in a recipient, be at least partially exposed to at least one of body tissue and fluid of the recipient. 22. The hearing prosthesis of claim 1, wherein the material is adapted to, upon implantation in a recipient, be at least partially exposed to body fluid of the recipient. 23. The hearing prosthesis of claim 1, wherein the material is adapted to, upon implantation in a recipient, osseointegrate with the bone of the recipient. 24. The hearing prosthesis of claim 1, wherein the material is adapted to, upon implantation in a recipient, osseointegrate with a skull bone of the recipient. 25. The hearing prosthesis of claim 1, wherein the material is adapted to, upon implantation in a recipient, transmit vibrations representative of a sound signal directly to the bone of the recipient. 26. The hearing prosthesis of claim 1, wherein the actuator includes: a first surface formed by the at least a portion of the material, the first surface being adapted to directly contact and osseointegrate with a skull of the recipient via osseointegration. 27. A hearing prosthesis comprising: actuator means for deforming in accordance with an electrical sound signal to vibrate a hearing organ of a recipient of the hearing prosthesis, wherein at least a portion of the means is adapted to be exposed to and osseointegrated with bone of the recipient, whereinat least a portion of the means adapted to be exposed to an osseointegrated with bone of the recipient is made of a material that is substantially devoid of non-biocompatible substances; andthe means comprises a piezoelectric material. 28. The hearing prosthesis of claim 27, wherein the actuator means: is adapted to be implanted such that the piezoelectric material directly contacts and osseointegrates with the recipient's bone. 29. The hearing prosthesis of claim 27, wherein the actuator means is a material that deforms in response to an electrical signal, wherein the material is adapted to, upon implantation in a recipient, be at least partially exposed to at least one of body tissue and fluid of the recipient. 30. The hearing prosthesis of claim 27, wherein the actuator means includes a first surface formed by the at least a portion of a material that deforms in response to an electrical signal, the first surface being adapted to directly contact and osseointegrate with a skull of the recipient via osseointegration 31. The hearing prosthesis of claim 27, wherein the actuator means includes a material that deforms in response to an electrical signal, wherein the material is adapted to, upon implantation in a recipient, be at least partially exposed to body fluid of the recipient. 32. A method of imparting vibrational energy to bone, the method comprising: deforming deformable material of an actuator in response to an electric signal applied thereto; andimparting vibrational energy resulting from the deformation of the deformable material directly from the deformable material to the bone, whereinthe deformable material is a piezoelectric material and is substantially devoid of non-biocompatible substances. 33. The method of claim 32, wherein the material is at least partially exposed to at least one of body tissue and fluid of the recipient while the vibrational energy is imparted to the bone. 34. The method of claim 32, wherein the material is at least partially exposed to body fluid of the recipient while the vibrational energy is imparted to the bone. 35. The method of claim 32, wherein the action of imparting vibrational energy to the bone entails transmitting vibrations representative of a sound signal directly to the bone of the recipient. 36. The method of claim 32, wherein: the vibrational energy is imparted to the bone while the deformable material directly contacts the bone. 37. The method of claim 32, further comprising: directly contacting and osseointegrating at least a portion of a deformable material with the bone. 38. A hearing prosthesis comprising: an actuator including a material that deforms in response to an electrical signal, wherein the material is adapted to, upon implantation in a recipient, transmit vibrations representative of a sound signal to the bone of the recipient and to be at least partially exposed to at least one of body tissue and fluid of the recipient, whereinthe material is a piezoelectric material, and the material is substantially devoid of non-biocompatible substances.