Implant for filling bone cavities and fixing bone fragments in a living body, method of producing the same, and bone implant system
First Claim
1. Method of producing sintered tricalcium phosphate implants for filling bone cavities and for fixing bone fragments in a living body, which comprisesmixing tricalcium phosphate with at least one substance which under heat sufficiently high to bake said tricalcium phosphate, forms a gas,shaping the thus-formed mixture into shaped bodies thereof,baking the shaped bodies at a temperature sufficiently high to cause gas formation from said substance, thereby forming pores in said shaped bodies,impregnating said shaped porous bodies with a therapeutically-active ingredient, thereby distributing the same in the pores, andcoating at least a portion of one of said shaped, porous bodies having said therapeutically-active ingredient distributed therein, with a coating of a predetermined thickness of a biodegradable substance,whereby the time of absorption of said therapeutically-active ingredient is controlled by the thickness of said biodegradable substance.
1 Assignment
0 Petitions
Accused Products
Abstract
A sintered tricalcium phosphate implant for filling bone cavities and for fixing bone fragments is provided, which comprises a discretely-shaped, porous body, at least one therapeutically-active ingredient impregnated into this porous body and distributed among the pores therein, and at least one coating of predetermined thickness of a biodegradable substance on at least a portion of this porous body, so that the time of absorption of the therapeutically-active ingredient is controlled by the thickness of the biodegradable substance. A process for producing this sintered tricalcium phosphate implant is also provided, along with an implant system for filling bone cavities and for fixing bone fragments in a living body, comprising a number of such tricalcium phosphate bone implants, with discrete coatings of biodegradable substance of predetermined thicknesses over at least some of the porous bodies constituting the tricalcium phosphate bone implants.
112 Citations
33 Claims
-
1. Method of producing sintered tricalcium phosphate implants for filling bone cavities and for fixing bone fragments in a living body, which comprises
mixing tricalcium phosphate with at least one substance which under heat sufficiently high to bake said tricalcium phosphate, forms a gas, shaping the thus-formed mixture into shaped bodies thereof, baking the shaped bodies at a temperature sufficiently high to cause gas formation from said substance, thereby forming pores in said shaped bodies, impregnating said shaped porous bodies with a therapeutically-active ingredient, thereby distributing the same in the pores, and coating at least a portion of one of said shaped, porous bodies having said therapeutically-active ingredient distributed therein, with a coating of a predetermined thickness of a biodegradable substance, whereby the time of absorption of said therapeutically-active ingredient is controlled by the thickness of said biodegradable substance.
-
17. A sintered tricalcium phosphate implant for filling bone cavities and for fixing bone fragments in a living body, comprising
a discretely-shaped, baked porous body of tricalcium phosphate, at least one therapeutically-active ingredient impregnated into said porous body and distributed among the pores therein, and at least one coating of predetermined thickness of a biodegradable substance on at least a portion of said porous body impregnated with said therapeutically-active ingredient, whereby the time of absorption of said therapeutically-active ingredient is controlled by the thickness of said biodegradable substance.
-
31. An implant system for filling bone cavities and for fixing bone fragments in a living body, said system comprising
discretely-shaped, porous bodies of tricalcium phosphate, at least one therapeutically-active ingredient impregnated into said porous bodies and distributed among the pores therein, and at least one coating of predetermined thickness of a biodegradable substance on at least a portion of one of said porous bodies impregnated with said therapeutically-active ingredient, whereby the time of absorption of said therapeutically-active ingredient is controlled by the thickness of said biodegradable substance.
Specification