Stock material or miscellaneous articles – Structurally defined web or sheet – Laterally noncoextensive components
Reexamination Certificate
2004-05-26
2011-10-18
Sample, David (Department: 1783)
Stock material or miscellaneous articles
Structurally defined web or sheet
Laterally noncoextensive components
C428S220000
Reexamination Certificate
active
08039090
ABSTRACT:
A porous composite comprising a porous layer containing a calcium phosphate ceramic, and a dense layer formed on part of the porous layer and having a smaller average pore size than that of the porous layer. The porous composite can be produced by (1) introducing a slurry containing a calcium phosphate ceramic/collagen composite and collagen into a molding die having a high thermal conductivity, (2) rapidly freezing and drying the slurry in the molding die, to form a porous body comprising a porous layer and a dense layer formed on the porous layer, (3) cross-linking collagen in the porous body, and (4) removing the dense layer except for a portion thereof on a surface coming into contact with a soft tissue when implanted in a human body, so that the porous layer is exposed.
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Ikoma Toshiyuki
Kawamura Katsumi
Kikuchi Masanori
Nakajima Takehiko
Shoji Daisuke
Greenblum & Bernstein P.L.C.
Hoya Corporation
Khan Tahseen N
National Institute for Materials Science
Sample David
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