Porous ceramic material and processes for preparing same
First Claim
1. A porous ceramic material comprising a sintered porous body of a calcium phosphate compound, wherein a multiplicity of capillary void paths having a diameter in the range of 1 to 30 μ
- m and a multiplicity of pores interconnected by said capillary void paths having a diameter of 3 to 600 μ
m are formed in the sintered porous body and at least part of said pores are connected to the exterior space of the sintered porous body through at least a part of said capillary void paths and wherein all of the capillary void paths have substantially the same diameters and said pores are substantially spherical, and the diameters of said capillary void paths are smaller than the diameters of said pores.
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Abstract
A porous ceramic material composed of a sintered porous body of a calcium phosphate compound is described. A multiplicity of capillary void paths having a diameter of 1 to 30 μm and a multiplicity of pores having a diameter of 1 to 600 μm are formed in the sintered porous body. At least part of the pores are connected to the exterior space of the sintered porous body through at least a part of the capillary voids. The porous ceramic material is valuable as a medical material, e.g., a substitute or prosthesis for bone or dental root, and also an electronic material and a genetic engineering material.
When the porous ceramic material is embedded in a bone defect of human or animals, osteolytic cells, osteoblasts, erythrocytes and body fluid are selectively allowed to intrude through the porous ceramic material while almost no intrusion of osteoclasts and collagen fibers is allowed. Accordingly, the porous ceramic material can be utilized for inducing new-born bone, controlling resorption of bone with age, remedying bone defects.
75 Citations
19 Claims
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1. A porous ceramic material comprising a sintered porous body of a calcium phosphate compound, wherein a multiplicity of capillary void paths having a diameter in the range of 1 to 30 μ
- m and a multiplicity of pores interconnected by said capillary void paths having a diameter of 3 to 600 μ
m are formed in the sintered porous body and at least part of said pores are connected to the exterior space of the sintered porous body through at least a part of said capillary void paths and wherein all of the capillary void paths have substantially the same diameters and said pores are substantially spherical, and the diameters of said capillary void paths are smaller than the diameters of said pores. - View Dependent Claims (2, 3, 4, 5, 6, 13, 14, 15, 16, 18, 19)
- m and a multiplicity of pores interconnected by said capillary void paths having a diameter of 3 to 600 μ
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7. A method for inducing a newborn bone which comprises filling or embedding in a defect of a bone of a human or animal, a porous ceramic material composed of a sintered porous body of a calcium phosphate compound, wherein a multiplicity of capillary void paths having a diameter of 1 to 30 μ
- m and a multiplicity of pores interconnecting by said capillary void paths and having a diameter of 3 to 600 μ
m are formed in the sintered porous body and at least part of said pores are connected to the exterior space of the sintered porous body through at least a part of said capillary void paths, said capillary void paths having substantially the same diameters, said pores being substantially spherical and the diameters of said capillary void paths being smaller than the diameters of said pores, whereby a new-born bone is induced while intrusion of collagen fibers and osteoclasts into the porous ceramic material is restricted. - View Dependent Claims (8, 9, 10, 11, 12, 17)
- m and a multiplicity of pores interconnecting by said capillary void paths and having a diameter of 3 to 600 μ
Specification