Process for the preparation of preserved transplants

DETAILED DESCRIPTION What is claimed is: 1.
A process for the preparation of biological collagenous material for use as a transplant comprises contacting said material in a continuous manner with fresh amounts of a water-miscible organic solvent selected from the group consisting of methanol, ethanol, propanol, isopropanol, acetone, methylethylketone and mixtures thereof so as to dehydrate said material, and subsequently removing said solvent at a pressure of between 0.
1 bar to 1.
0 bar.
2.
A process according to claim 1, comprising effecting said dehydration in from 2 to 24 hours.
3.
A process according to claim 2, comprising effecting said dehydration in from 5 to 12 hours.
4.
A process according to claim 1, wherein after contacting said material with said solvent, said solvent is removed at a pressure of about 0.
5 bar.
5.
A process according to claim 1, wherein after contacting said material with said solvent, said solvent is removed at a temperature of from 10 to 50 degrees centigrade.
6.
A process according to claim 5, wherein said solvent is removed at about 37 degrees centigrade.
7.
A method of preserving material suitable for use as a human transplant comprising contacting dura mater with fresh amounts of water-miscible organic solvent selected from the group consisting of methanol, ethanol, propanol, isopropanol, acetone, methyl-ethylketone and mixtures thereof so as to dehydrate said dura mater, and subsequently removing said solvent at a pressure of between 0.
1 bar and 1.
0 bar.
8.
Dura mater which has been preserved for use as a human transplant by contacting said dura mater in a continuous manner with fresh amounts of a water-miscible organic solvent selected from the group consisting of methanol, ethanol, propanol, isopropanol, acetone, methylethylketone and mixtures thereof so as to dehydrate said dura mater, and subsequently removing said solvent at a pressure of between 0.
1 bar and 1.
0 bar.
9.
A method of preserving material suitable for use as a human transplant comprising contacting a biological collagenous material without subdivision thereof at ambient temperatures in the absence of added water with fresh amounts of water-miscible organic solvent selected from the group consisting of methanol, ethanol, propanol, isopropanol, acetone, methylethylketone and mixtures thereof so as to dehydrate said material, and subsequently removing said solvent at a pressure of between 0