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:
Disclosed is a biocompatible device surface-coated on the base material thereof with a biocompatible polymer layer having antithrombogenicity and endothelialization activity, and embedded in or attached to a living body for use. The polymer layer comprises a polymer matrix formed by the crosslinking of a cell-adhesive peptide-containing polymer.
Abstract:
This invention relates to a scaffold consisting of a biodegradable polymeric material with a composition gradient of calcium phosphate that is capable of effectively regenerating the hard/soft tissue interface and an implant for hard/soft tissue filling with the utilization of such scaffold.
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:
Disclosed is a two-component, bio-degradable/absorbable adhesive medical material, which has a bonding component comprising a biodegradable polymer, and a hardening component comprising a low-molecular-weight derivative prepared by modifying a carboxyl group in a di- or tri-carboxylic acid of the citric acid cycle, with an electron-attracting group (one or a combination of two or more selected from the group consisting of a succinimidyl group, a sulfosuccinimidyl group, a maleimidyl group, a phthalimidyl group, an imidazolyl group, a nitrophenyl group and a tresyl group, and derivatives thereof). The present invention is intended to meet the need for developing a biological tissue adhesive having strong bonding force and low biological toxicity, in the situation where a conventional hemostatic material, blood-vessel embolizing material, sealant or aneurysm closing material has been liable to peel off from its applied site and has not been able to achieve sufficient hemostatic effect or sealing/closing strength in occluding a blood vessel, stopping bleeding, sealing air-leak or closing an aneurysm.
Abstract:
This invention relates to a scaffold consisting of a biodegradable polymeric material with a composition gradient of calcium phosphate that is capable of effectively regenerating the hard/soft tissue interface and an implant for hard/soft tissue filling with the utilization of such scaffold.
Abstract:
Disclosed is a glycosaminoglycan-polycation complex as a matrix material for use in tissue regeneration, such as cartilage repair, and a preparation method thereof. The complex is synthesized by crosslinking glycosaminoglycan and polycation with a polyfunctional crosslinking agent under physiological conditions. In this method, the crosslinking agent consists of polyethyleneglycol having two or more electrophilic leaving groups (e.g. succinimidyl group or its derivatives) at the carboxyl terminal thereof, and the concentration of the crosslinking agent is in the range of 0.3 to 3 mM. According the present invention, the crosslinking reaction can be performed under physiological conditions to avoid conventional problems of adverse affect on cells (cell death) and the formation of a polyion complex (inhomogeneous precipitate) due to a crosslinking reaction in alcohol or water. Thus, the crosslinking reaction can be conducted in the presence of cells mixed to the glycosaminoglycan and polycation in advance.
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.