Abstract:
A nickel-free stainless steel stent using a stainless steel which does not substantially contain Ni in the stainless steel, has a metal allergy onset-preventing effect, and is excellent in terms of precision workability, strength, and ductility, is provided. The nickel-free stainless steel stent is characterized by using a stainless steel containing, as a chemical composition, from 15 to 30% by mass of Cr, from 0.97 to 2% by mass of Mo, and from 0.5 to 1% by mass of N, with the remainder being Fe, and optionally containing inevitable impurities.
Abstract:
A porous and spherical calcium phosphate particle which is substituted with a metal ion or has a metal ion carried on the surface thereof, and has a particle diameter of 0.1 to 100 μm. The calcium phosphate particle is a novel functional particle which is useful, for example, as a material for use in gas chromatography allowing the separation of a chemical substance of a trace amount with high accuracy.
Abstract:
The crosslinking agents and condensing agents that have been employed in biological adhesives and in treating medical devices such as cardiac valves are non-natural compounds synthesized artificially. Thus, they are not metabolized in vivo and exhibit toxicity to living bodies. These compounds are thus used only in a restricted amount and for limited purposes in the clinical sites. The present invention provides a biological low-molecular-weight derivative obtained by modifying carboxyl groups of a biological low-molecular-weight compound with N-hydroxysuccinimide, N-hydroxysulfosuccinimide, or a derivative thereof and a crosslinked high-molecular-weight product obtained by crosslinking various high-molecular-weight compounds with this derivative.
Abstract:
Provided is a bio-hybrid material that does not cause elution of nickel ions and has an excellent endothelialization ability, a production method therefor, and a stent. The bio-hybrid material (101) used includes an alloy part (11) free of Ni, an organic acid (12) having two or more active esters, and a cytokine (13). The alloy part (11) free of Ni forms an ester bond with the organic acid (12), and the organic acid (12) and the cytokine (13) are immobilized via an amide bond.
Abstract:
[Object] A medical material that improves therapeutic effects in epithelial cells such as keratoconjunctival epithelial cells with the use of an amnion, and a process for producing the same are provided. [Solving Means] A medical material includes an amnion, which is a placental tissue, a polymer film bonded to one surface of the amnion and crosslinked, and cells adhered to the other surface of the amnion. A process for producing the medical material includes the steps of preparing an amnion from which the spongy layer is removed, bonding a biocompatible polymer film to one surface of the amnion followed by crosslinking, adhering epithelial stem cells to the other surface of the amnion, and proliferating epithelial cells from the epithelial stem cells on the surface of the amnion.
Abstract:
A hydroxyapatite consisting substantially of Ca10(PO4)6(OH)2, and having a crystal structure which has at least two diffraction peaks at 31-32 degrees and 26 degrees in X-ray diffractometry; and a process for producing a hydroxyapatite which comprises the step (A) of immersing a substrate in a first aqueous solution containing calcium ions and a second solution containing PO4 ions to generate the hydroxyapatite at least on the surface of the substrate and the step (B) of recovering the hydroxyapatite from the substrate.
Abstract:
A method for preparing a hydroxyapatite composite is disclosed. This method comprises alternately soaking a matrix which has been made hydrophilic at least on its surface, in a calcium ion aqueous solution containing calcium ions and substantially free of phosphate ions and in a phosphate ion aqueous solution containing phosphate ions and substantially free of calcium ions to securely form hydroxyapatite at least on the surface of the matrix. Also disclosed is a biocompatible material composed of the hydroxyapatite composite obtained by the method.
Abstract:
The present invention addresses the problem of providing: a two-component tissue adhesive having high adhesive strength and high biocompatibility; and a method for producing the two-component tissue adhesive. The present invention involves a two-component tissue adhesive comprising hydrophobically-modified gelatin as a first agent and a cross-linking reagent as a second agent. The hydrophobically-modified gelatin is provided with an amino group and a hydrophobic group on the side chain thereof, and the cross-linking reagent has two or more active ester groups or anhydrides within a single molecule.
Abstract:
The present invention addresses the problem of providing: a tissue adhesive film having high adhesive strength and high biocompatibility; and a method for producing the tissue adhesive film. This problem can be solved by using a tissue adhesive film comprising an integration of gelatin and cross-linking reagents, wherein the gelatin is provided with an amino group on the side chain thereof and has a molecular weight of 50,000 or higher and 100,000 or lower, and the cross-linking reagents have two or more active ester groups or an anhydride.
Abstract:
Previously reported composite materials comprising a hydrophilic high-molecular-weight matrix and a low-molecular-weight organic compound involve a problem in that: it is difficult to compound a high load of the low-molecular-weight organic compound in the high-molecular-weight matrix; and thus produced composite material yields a high-molecular-weight matrix component that can form a thrombus when contacting with blood. Now, it becomes possible to produce a composite material having an antithrombogenic activity and a high content of a low-molecular-weight organic compound by the present invention comprising the steps of: crosslinking a polymer with an organic acid derivative which is used as a crosslinker in an organic solvent while at the same time embedding the low-molecular-weight organic compound therein; and substituting the organic solvent by water after the production of the high-molecular-weight matrix to effect precipitation and compounding of the low-molecular-weight organic compound in the high-molecular-weight matrix.