摘要:
Described are medical devices which are or can be used to form tubular medical devices, and related methods. Preferred devices include tubular grafts of biomaterial having lumen walls which present no seam edge that traverses the entire length of the lumen, illustratively including devices having lumen walls which have a discontinuous seam presenting multiple seam edges. Such a device may include a tubular structure formed by inserting a plurality of extensions (14) of a biomaterial sheet (12) through a plurality of corresponding apertures (16) of the sheet.
摘要:
A system for hemodynamic simulation comprises a vessel (12) having properties of a blood vessel, a reservoir (14) containing a quantity of fluid, tubing (24) connecting the vessel (12) and reservoir (14), and at least one pump (22) for circulating the fluid within the system. Fluid can be tissue culture medium or blood analog fluid, and the vessel (12) may include mammalian cells attached to its inside. A drive system (44), comprising two reciprocating drive shafts (50, 52) that are coupled by a cam (54), enables the uncoupling of pulsatile flow and pulsatile pressure to provide independent control over wall shear stress and cirumferential strain. The shaft drives two pumps that are 180 degrees out-of-phase and are connected upstream and downstream of the vessel, and effect this uncoupling.
摘要:
The present invention relates to a process for the production of fibres of an unhydroxylated recombinant collagen polypeptide, and the fibres obtained thereby, as well as to uses of such fibres as a biomaterial.
摘要:
The invention is directed to collagenous tissues which have been treated to remove non-collagenous components such as cells, cellular debris, and other extracellular matrix components, such as proteoglycans and glycosaminoglycans, normally found in native tissues. Treatment of the tissue with alkali, chelating agents, acids and salts removes non-collagenous components from the collagenous tissue matrix while controlling the amount of swelling and dissolution so that the resultant collagen matrix retains its structural organization, integrity and bioremodelable properties. The process circumvents the need to use detergents and enzymes which detrimentally affect the cell compatibility, strength and bioremodelability of the collagen matrix. The collagenous tissue matrix is used for implantation, repair, or use in a mammalian host.
摘要:
A method for fixation of biological tissues, and bioprosthetic devices prepared by such method. The method generally comprises the steps of: A) fixing the tissue; B) treating the tissue with a mixture of i) a denaturant, ii) a surfactant and iii) a cross-linking agent; C) fabricating or forming the bioprosthesis (e.g., forming the tissue and attaching any non-biological components thereto); and D) subjecting the bioprosthesis to terminal sterilization.
摘要:
The present invention relates to a process for the production of fibres of an unhydroxylated recombinant collagen polypeptide, and the fibres obtained thereby, as well as to uses of such fibres as a biomaterial.
摘要:
A sterile body implant is derived from a body structure having as its major protein component collagens in the form of extracellular matrix. The body structure is treated to remove cellular membranes, nucleic acids, lipids and cytoplasmic components. Such structures are implanted internally in the body or externally on the body in a variety of medical uses.
摘要:
Un équivalent osseux, utile dans la fabrication de prothèses, est préparé à partir d'un réseau de collagène hydraté contracté par des cellules de fibroblaste et contenant une poudre d'os déminéralisé.
摘要:
Problems with conventional collagen materials such as insufficient strength are overcome by a composite material of de-N-acetlylated chitin and fibrous collagen. This material may be prepared by bringing the de-N-acetylated chitin and the fibrous collagen into mutual contact in an aqueous acidic medium followed by deacidifying the product obtained. The fibrous collagen can be partially replaced by gelatin and/or soluble collagen. The composite material finds use in medical materials, as an edible casing for food and as a base material for immobilizing an enzyme.