Abstract: Disclosed is a method of producing high-concentration collagen for use as a medical material, including: washing tissue of a mammal; subjecting the washed tissue to crushing and immersion in ethyl alcohol; subjecting the tissue to enzymatic treatment with stirring in purified water containing phosphoric acid and pepsin; adding sodium chloride to the collagen subjected to enzymatic treatment, performing stirring, and aggregating collagen; dissolving the aggregated collagen in purified water to give a collagen solution, which is then filtered using a filter and concentrated by removing the pepsin, low-molecular-weight material, and sodium chloride from the collagen solution using a tangential flow filtration device; subjecting the concentrated collagen to sterile filtration, aggregating the collagen using a pH solution in a neutralization tank, and concentrating the collagen by removing a non-aggregated solution; and concentrating the concentrated collagen using a centrifuge and stirring the concentrated collag

Abstract: Disclosed are a matrix for restoring soft tissue and a method of producing the same, the method including: forming a sheet-type absorption layer (11) on one side of a double layer using biocompatible neutral collagen; forming a film-type support layer (12) on the remaining surface of the double layer by mixing collagen with a water-soluble polymer and a natural material; and forming a double layer-structured matrix (10) for restoring soft tissue by attaching the absorption layer (11) and the support layer (12) so as to treat damage to soft tissue of a mammal other than a human or restore damaged soft tissue. This invention pertains to the treatment of damage to soft tissue such as tendons, ligaments, and rotator cuffs or the restoration of damaged soft tissue, whereby the quality and reliability of products can be remarkably improved, thus satisfying various needs of consumers, who are the users thereof, and exhibiting a good effect.