Composite and its use
First Claim
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1. A porous composite, which is intended to be filled into a recess or a through-passing hole of an implant, and which comprises:
- particles A prepared from a bioactive material which will react in the physiological conditions within the body so that an outermost layer of a block of said bioactive material forms a chemical bond with surrounding host tissue, and particles B, which are prepared from a non-bioactive material or from a weakly bioactive material which under physiological conditions does not dissolve within the first few months, wherein the particles A and the particles B are partially melted together to form a porous composite having a three dimensional structure in which individual particles are connected to at least one adjacent particle but retain a substantially spherical individual shape, characterized in that the particles A and B are essentially homogeneous in size, and wherein said particles A and particles B are approximately the same size compared to one another, and have a diameter of at least 250 microns.
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Abstract
A porous composite suitable for filling a recess or a through-passing hole in an implant. The composite includes particles A prepared from a bioactive material and particles B prepared from a non-bioactive material or weakly bioactive material, which is sintratable with the bioactive material, such that particles A and particles B have been sintered together to a porous composite. Particles A and particles B are essentially homogeneous in size. Also disclosed is an implant which contains a core and the composite.
131 Citations
14 Claims
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1. A porous composite, which is intended to be filled into a recess or a through-passing hole of an implant, and which comprises:
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particles A prepared from a bioactive material which will react in the physiological conditions within the body so that an outermost layer of a block of said bioactive material forms a chemical bond with surrounding host tissue, and particles B, which are prepared from a non-bioactive material or from a weakly bioactive material which under physiological conditions does not dissolve within the first few months, wherein the particles A and the particles B are partially melted together to form a porous composite having a three dimensional structure in which individual particles are connected to at least one adjacent particle but retain a substantially spherical individual shape, characterized in that the particles A and B are essentially homogeneous in size, and wherein said particles A and particles B are approximately the same size compared to one another, and have a diameter of at least 250 microns. - View Dependent Claims (2, 3, 4, 5, 6, 13, 14)
SiO2 53-60% by weight Na2O 0-34% by weight K2O 1-20% by weight MgO 0-5% by weight CaO 5-25% by weight B2O3 0-4% by weight P2O5 0.5-6% by weight, provided that Na2O+K2O=16-35% by weight K2O+MgO=5-20% by weight MgO+CaO=10-25% by weight.
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6. The composite according to claim 1, characterized in that the mixing ratio of particles A and B has been chosen so that the amount of particles A varies from about ⅕
- to nearly {fraction (1/1)} of the total amount of the composite, preferably about ⅓
of the total amount of the composite.
- to nearly {fraction (1/1)} of the total amount of the composite, preferably about ⅓
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13. The composite according to claim 1, characterized in that, in the sintering step, it has been formed into a block of the desired shape and size, which can be attached into the recess or the through-passing hole made into the implant core.
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14. The composite according to claim 13, characterized in that the composite block is comprised of several sublayers wherein various sublayers have a distinct mixing ratio between the particles A and B so that the content of the particles A in the composite increases from the sublayer facing the implant core, towards the sublayer of the composite to come in contact with the tissue.
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7. An implant comprising a core having a recess or a through-passing hole and a bioactive structural component contained within said recess or through-passing hole and which extends to the surface of the implant, wherein said bioactive structural component comprises a layer of a porous composite which comprises:
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particles A prepared from a bioactive material which will react in the physiological conditions within the body so that the outermost layer of a block manufactured from said bioactive material forms a chemical bond with surrounding host tissue, and particles B, which are prepared from a non-bioactive material or from a weakly bioactive material which under physiological conditions does not dissolve within the first few months, wherein the particles A and the particles B are partially melted together to form a porous composite having a three dimensional structure in which individual particles are connected to one at least one adjacent particle but retain a substantially spherical individual shape, characterized in that the particles A and B are essentially homogeneous in size, and wherein said particles A and particles B are approximately the same size compared to each other, and have a diameter of at least 250 microns. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification