US4654314A
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Porous ceramic material and processes for preparing same
Assignee: Sumitomo Cement Co Ltd
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Filing: 1984-07-06
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Granted: 1987-03-31
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Expires: 2004-07-06
Abstract
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.
Inventors
- 👤 Shigehide Takagi
- 👤 Shigeru Yamauchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:40
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/06; A; A61; A61L; A61L27/00; A61L27/02; A61L27/12; A61L27/50; A61L27/56; C04B38/063; C04B38/0635; C04B38/0645; C04B38/065; C04B38/10; C04B38/106; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; A61L2400/00; A61L2400/18; C04B2111/00; C04B2111/00474; C04B2111/00836; C04B2111/00844
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
162 words
A process for the preparation of a porous ceramic material, which comprises the steps of: bubbling 100 parts by weight of albument to form a multiplicity of bubbles having a size of 1 to 600 μm; incorporating the bubbled albumen with 30 to 120 parts by weight of a calcium phosphate compound powder and 1 to 5 parts by weight of an organic fiber having a length of 5 μm to 5 mm and a diameter of 1 to 30 μm, shaping the thus-obtained mixture into a desired shape and size, heating the shaped mixture at a temperature of 120° to 150° C. to harden the albumen; heating the hardened shaped mixture at a temperature of 500° to 700° C. to carbonize the hardened albumen and organic fiber; and then, heating the carbonized shaped mixture at a temperature of 800° to 2,350° C. in an oxygen-containing atmosphere to remove the carbonization product by burning and to sinter the calcium phosphate compound powder.
Claim 2
Dependent Claim
162 words
A process for the preparation of a porous ceramic material, which comprises the steps of: bubbling 100 parts by weight of albument to form a multiplicity of bubbles having a size of 1 to 600 μm; incorporating the bubbled albumen with 30 to 120 parts by weight of a calcium phosphate compound powder and 1 to 5 parts by weight of an organic fiber having a length of 5 μm to 5 mm and a diameter of 1 to 30 μm, shaping the thus-obtained mixture into a desired shape and size, heating the shaped mixture at a temperature of 120° to 150° C. to harden the albumen; heating the hardened shaped mixture at a temperature of 500° to 700° C. to carbonize the hardened albumen and organic fiber; and then, heating the carbonized shaped mixture at a temperature of 800° to 2,350° C. in an oxygen-containing atmosphere to remove the carbonization product by burning and to sinter the calcium phosphate compound powder.
Claim 3
Dependent Claim
42 words
A process according to claim 1, wherein the step of heating the shaped mixture for the hardening of albumen is carried out in an atmosphere having a relative humidity of 30 to 70% at a temperature-elevating rate of 5° to 10° C./min.
Claim 4
Dependent Claim
20 words
A process according in claim 1, wherein the calcium phosphate compound powder has a particle diameter 0.05 to 10 μm.
Claim 5
Dependent Claim
31 words
A process according to claim 1, wherein the organic fiber is at least one member selected from an animal fiber, a silk fiber, a cellulose fiber and an organic synthetic fiber.
Claim 6
Dependent Claim
141 words
A process for the preparation of a porous ceramic material, which comprises the steps of: mixing 20 to 300 parts by weight of sublimable solid substance particles having a particle diameter of 1 to 600 μm and 1 to 5 parts by weight of an organic fiber having a length of 5 μm to 5 mm and a diameter of 1 to 30 μm with 100 parts by weight of a calcium phosphate compound powder; press-shaping the thus-obtained mixture into a desired shape and size; heating the shaped mixture at a temperature of 200° to 800° C. to remove the sublimable substance by sublimation and carbonize the organic fiber; and then, heating the shaped mixture at a temperature of 800° to 1,350° C. in an oxygen-containing atmosphere to remove the carbonization product by burning and sinter the calcium phosphate compound powder.
Claim 7
Dependent Claim
141 words
A process for the preparation of a porous ceramic material, which comprises the steps of: mixing 20 to 300 parts by weight of sublimable solid substance particles having a particle diameter of 1 to 600 μm and 1 to 5 parts by weight of an organic fiber having a length of 5 μm to 5 mm and a diameter of 1 to 30 μm with 100 parts by weight of a calcium phosphate compound powder; press-shaping the thus-obtained mixture into a desired shape and size; heating the shaped mixture at a temperature of 200° to 800° C. to remove the sublimable substance by sublimation and carbonize the organic fiber; and then, heating the shaped mixture at a temperature of 800° to 1,350° C. in an oxygen-containing atmosphere to remove the carbonization product by burning and sinter the calcium phosphate compound powder.
Claim 8
Dependent Claim
21 words
A process according to claim 5, wherein the calcium phosphate compound powder has a particle diameter of 0.05 to 10 μm.
Claim 9
Dependent Claim
26 words
A process according to claim 5, wherein the sublimable solid substance is at least one member selected from the group consisting of camphor, menthol and naphthalene.
Claim 10
Dependent Claim
35 words
A process according to claim 5, wherein the organic fiber is at least one member selected from the group consisting of an animal fiber, a silk fiber, a cellulose fiber and an organic synthetic fiber.
Claim 11
Dependent Claim
143 words
A process for the preparation of a porous ceramic material, which comprises the steps of: mixing 25 to 380 parts by weight of organic synthetic resin particles having a particle diameter of 1 to 600 μm and 1 to 5 parts by weight of an organic fiber having a length of 5 μm to 5 mm and a diameter of 1 to 30 μm with 100 parts by weight of a calcium phosphate compound powder; press-shaping the thus-obtained mixture into a desired shape and size; heating the shaped mixture at a temperature of 200° to 800° C. to remove the organic synthetic resin by thermal decomposition and carbonize the organic fiber; and then, heating the shaped mixture at a temperature of 800° to 1,350° C. in an oxygen-containing atmosphere to remove the carbonization product by burning and sinter the calcium phosphate compound powder.
Claim 12
Dependent Claim
143 words
A process for the preparation of a porous ceramic material, which comprises the steps of: mixing 25 to 380 parts by weight of organic synthetic resin particles having a particle diameter of 1 to 600 μm and 1 to 5 parts by weight of an organic fiber having a length of 5 μm to 5 mm and a diameter of 1 to 30 μm with 100 parts by weight of a calcium phosphate compound powder; press-shaping the thus-obtained mixture into a desired shape and size; heating the shaped mixture at a temperature of 200° to 800° C. to remove the organic synthetic resin by thermal decomposition and carbonize the organic fiber; and then, heating the shaped mixture at a temperature of 800° to 1,350° C. in an oxygen-containing atmosphere to remove the carbonization product by burning and sinter the calcium phosphate compound powder.
Claim 13
Dependent Claim
21 words
A process according to claim 9, wherein the calcium phosphate compound powder has a particle diameter of 0.05 to 10 μm.
Claim 14
Dependent Claim
27 words
A process according to claim 9, wherein the organic synthetic resin is at least one member selected from the group consisting of polymethyl methacrylate, polypropyelne and polystyrene.
Claim 15
Dependent Claim
35 words
A process according to claim 9, wherein the organic fiber is at least one member selected from the group consisting of an animal fiber, a silk fiber, a cellulose fiber and an organic synthetic fiber.
Claim 16
Dependent Claim
21 words
A process according to claim 9, wherein the organic synthetic resin particles have a particle diameter of 10 to 300 μm.
Claim 17
Dependent Claim
171 words
A process for the preparation of a porous ceramic material, which comprises the steps of: mixing 25 to 380 parts by weight of organic synthetic resin particles having a particle diameter of 1 to 600 μm, 2 to 5 parts by weight of sublimable solid substance particles having a particle diameter of 1 to 600 μm and 1 to 5 parts by weight of an organic fiber having a length of 5 μm to 5 mm and a diameter of 1 to 30 μm with 100 parts by weight of a calcium phosphate compound powder; press-shaping the thus-obtained mixture into a desired shape and size; heating the shaped mixture at a temperature of 200° to 800° C. to remove the organic synthetic resin particles by thermal decomposition, carbonize the organic fiber and remove the sublimable substance particles by sublimation; and then, heating the shaped mixture at a temperature of 800° to 1,350° C. in an oxygen-containing atmosphere to remove the carbonization product by burning and sinter the calcium phosphate compound powder.
Claim 18
Dependent Claim
171 words
A process for the preparation of a porous ceramic material, which comprises the steps of: mixing 25 to 380 parts by weight of organic synthetic resin particles having a particle diameter of 1 to 600 μm, 2 to 5 parts by weight of sublimable solid substance particles having a particle diameter of 1 to 600 μm and 1 to 5 parts by weight of an organic fiber having a length of 5 μm to 5 mm and a diameter of 1 to 30 μm with 100 parts by weight of a calcium phosphate compound powder; press-shaping the thus-obtained mixture into a desired shape and size; heating the shaped mixture at a temperature of 200° to 800° C. to remove the organic synthetic resin particles by thermal decomposition, carbonize the organic fiber and remove the sublimable substance particles by sublimation; and then, heating the shaped mixture at a temperature of 800° to 1,350° C. in an oxygen-containing atmosphere to remove the carbonization product by burning and sinter the calcium phosphate compound powder.
Claim 19
Dependent Claim
25 words
A process according to claim 14, wherein the sublimable substance is at least one member selected from the group consisting of camphor, menthol and naphthalene.
Claim 20
Dependent Claim
20 words
A process according to claim 15, wherein the organic synthetic resin particles have a particle diameter of to 300 μm.
Claim 21
Dependent Claim
20 words
A process according to claim 14, wherein the organic synthetic particles have a particle diameter of 10 to 300 μm.
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| 3.5 Years (Year 4) | 1990-03-30 | 1990-09-29 | 1991-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-30 | 1994-09-29 | 1995-03-31 | $3760.00 | Window Closed / Lapsed |
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