US 5,899,936 AGranted

Treated tissue for implantation and methods of preparation

AssigneeCryolife, Inc.

InventorSteven Goldstein

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Abstract

This disclosure includes a method for generating a functional hybrid bioprosthesis. Tissue formed naturally of interstitial collagens is treated to kill native cells and remove potentially immunologically active soluble molecules. Then it may be treated sequentially with extracellular matrix adhesion factor, extracellular matrix glycosaminoglycan, and growth factor appropriate to the cell type required to function within the matrix, and incubating the transplant tissue matrix with cells that are either allogeneic or autologous for the recipient thereby imparting to the matrix the characteristics of the cell type and tissue selected. Tissues with a variety of functional bioactivities can thus be formed in vitro prior to graft transplantation or implantation which will exhibit reduced or no stimulation of an immunological response in the recipient.

Claims9

Dependent claims

A process for treating bodily tissue which has been harvested from a donor to improve its compatibility with the immune system of an implant recipient to which said tissue in untreated form is xenogeneic, comprising the steps of

treating said bodily tissue to form a decellularized tissue matrix;
applying to a decellularized tissue matrix an amount of one or more cellular adhesion factors effective to promote the subsequent adhesion of cultured cells within the tissue matrix, wherein the cellular adhesion factor comprises one or more extracellular proteins ordinarily associated with the tissue in a liquid vehicle;
and then repopulating the tissue matrix with cells which are autologous or allogeneic to said recipient to provide a substantially non-immunogenic and biomechanically acceptable implant or graft which is vitalized by the cellular repopulation and is otherwise histologically and biochemically similar to the untreated tissue.

Dependencies are inferred from the claim text.

Facts

Application: 08/463,171Filed 5 Jun 1995 · division
Priority: 14 Mar 1994
Granted: 4 May 1999
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

A61L 27/3687
Subjected to a specific treatment prior to implantation, e.g. decellularising, demineralising, grinding, cellular disruption/non-collagenous…:…
A61L 27/3604
Containing ingredients of undetermined constitution or reaction products thereof , e.g. transplant tissue, natural bone, extracellular matrix:…
A61L 27/3625
Characterised by the human or animal origin of the biological material, e.g. hair, fascia, fish scales, silk, shellac, pericardium, pleura,…
A61L 27/3683
Containing ingredients of undetermined constitution or reaction products thereof , e.g. transplant tissue, natural bone, extracellular matrix:…