Orbital implant

• US 20050119742A1
• Filed: 10/29/2002
• Published: 06/02/2005
• Est. Priority Date: 10/30/2001
• Status: Abandoned Application

• Current Assignee: Eyeborn (Proprietary) Limited
• Original Assignee: Eyeborn (Proprietary) Limited
• Inventors: Gous, Petrus Nicholaas Jacobus, Thomas, Gert Hendrik Jacobus Coetzee, Talma, Jan, Roux, Paul, Richter, Paul Wilhelm, Thomas, Michael Edward, Levitz, Lewis Mark, Minnaar, Mark
• Application Number:
  US10/250,525
• Publication Number:
  US 20050119742A1
• Time in Patent Office: Days
• US Class Current: 623/6.640
• CPC Class Codes: A61F 2/141 Artificial eyes
• CPC Class Codes: C04B 2111/00836 for medical or dental applications
• CPC Class Codes: C04B 2235/5436 micrometer sized, i.e. from 1 to 100 micron
• CPC Class Codes: C04B 2235/6021 Extrusion moulding
• CPC Class Codes: C04B 2235/6022 Injection moulding
• CPC Class Codes: C04B 35/447 based on phosphates , e.g. hydroxyapatite
• CPC Class Codes: C04B 38/00 Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof treating slag with gases or gas generating material C04B5/06 ; expanded graphite C04B35/536
• CPC Class Codes: C04B 38/0054 the pores being microsized or nanosized

Abstract

An orbital implant includes a body of bioactive material having macropores of at least 400 μm, and a cap of bioactive material having substantially no pores or only micropores smaller than 50 μm. The cap covers a portion of the body.

Claims

1. An orbital implant which includes a body of bioactive material having macropores of at least 400 μ

m, and a cap of bioactive material having substantially no pores or only micropores smaller than 50 μ

m, with the cap covering a portion of the body.

2. An implant according to claim 1, which is substantially spherical.

3. An implant according to claim 2, which has a diameter of about 20 mm.

4. An implant according to claim 1, wherein the macropores in the body are substantially spherical so that they have diameters of at least 400 μ

m, and, optionally, wherein the diameters of the macropores do not exceed 1000 μ

m.

5. An implant according to claim 1, wherein some macropores are in communication with the outer surface of the body and wherein adjacent macropores in the body are interconnected by openings and/or passageways, so that open paths to the outer surface of the body are thereby provided in the body.

6. An implant according to claim 5, wherein substantially no isolated or closed macropores are present in the body.

7. An implant according to claim 5, wherein the openings and/or passageways which interconnect adjacent macorpores have diameters greater than 50 μ

m.

8. An implant according to claim 5, wherein the macropores in the body occupy from 40% to 85% by volume of the body.

9. An implant according to claim 5, wherein the body has micropores smaller than 50 μ

m.

10. An implant according to claim 9, wherein at least some of the micropores are of irregular shape, and have a maximum dimension smaller than 50 μ

m.

11. An implant according to claim 9, wherein at least some of the micropores are substantially spherical so that their diameters are thus smaller than 50 μ

m.

12. An implant according to claim 9, wherein adjacent micropores in the body are interconnected by openings and/or passageways and wherein some micropores are also interconnected to the macropores by openings and/or passageways so that the micropores, by means of those openings and/or passages, provide open paths to the macropores.

13. An implant according to claim 12, wherein substantially no isolated or closed micropores are present in the body.

14. An implant according to claim 9, wherein some of the micropores are of irregular shape and are in the form of interstitial spaces between incompletely sintered bioactive material particles, and wherein some of the micropores are of substantially spherical shape, with irregular micropores interconnecting adjacent spherical micropores, and also connecting spherical micropores to macropores.

15. An implant according to claim 14, wherein all the spherical micropores are of substantially the same size while all the irregular micropores are of substantially the same size, with the irregular micropores being smaller than the spherical micropores.

16. An implant according to claim 14, wherein substantially no isolated or closed micropores are present in the body.

17. An implant according to claim 9, wherein the micropores occupy from 3% to 70% by volume of the macropore-free bioactive material.

18. An implant according to claim 1, wherein the cap is in the form of a circular concave disc integrated with the body of bioactive material.

19. An implant according to claim 1, which is substantially spherical, and wherein the cap has a thickness which is no more than half the diameter of the implant.

20. An implant according to claim 1, wherein the bioactive material of the body and that of the cap are the same, and is hydroxyapatite.