Patent ID: 8901078

Claim:
A cross-linked collagen-based material comprising Crosslink A, Crosslink B, and free amines (—NH 2 ): wherein: indicates collagen strands; R 1 is R 2 is R 3 and R 4 are independently selected from the group consisting of —CH 2 —O—(CH 2 ) n —O—CH 2 — and —CH 2 —(O(CH 2 ) n ) m —O—CH 2 —, n and m are independently an integer from 1-6, and the amount of free amines (—NH 2 ) on the collagen strands is between 50% and 85% relative to the total amount of free amines (—NH 2 ) prior to crosslinking, and the ratio of Crosslink A and Crosslink B is from about 80:20 to about 20:80.