Claims for Patent: 8,183,041

Summary for Patent: 8,183,041

Title:	Method of tissue repair using a multi-layered matrix
Abstract:	A multi-layered matrix, a method of tissue repair using the same, and multi-layered implant prepared thereof are provided. The multi-layered matrix comprises a first element and a second element connected thereto, and the second element comprises a hollow cavity. The first and the second elements are composed of a composite material comprising a bioabsorbable porous material.
Inventor(s):	Liao; Chun-Jan (Taipei, TW), Jiang; Ching-Chuan (Taipei, TW), Chiang; Hong-Sen (Taipei, TW), Lin; Yu-Ru (Ilan, TW)
Assignee:	Industrial Technology Research Institute (Hsinchu, TW) National Taiwan University Hospital (Taipei, TW)
Application Number:	12/385,775
Patent Claims:	1. A method of repairing tissue comprising the steps of: i) providing a multi-layered matrix comprising a first element and a second element connected thereto comprising a hollow cavity, wherein the first and the second elements are composed of a composite material comprising a bioabsorbable porous material; ii) seeding a cell block into the hollow cavity of the second element of the multi-layered matrix, wherein the cell block is enzyme-treated for 4 hours before being seeded into the hollow cavity; and iii) directly implanting the multi-layered matrix containing the cell block into a defect site of a living subject without an ex vivo incubation of the multi-layered matrix containing the cell block. 2. The method as claimed in claim 1, wherein the bioabsorbable porous material comprises polylactic acid (PLA), polyglycolic acid (PGA), poly (glycolide co- lactide) (PLGA), polyanhydride, polycaprolactone (PCL), polydiester, polyorthoester, collagen, gelatin, hyaluronic acid, chitosan, or polyethylene glycol (PEG), or a mixture thereof. 3. The method as claimed in claim 1, wherein the composite material further comprises a second material, wherein the second material comprises hydroxyapatite (HAP), tricalcium phosphate (TCP), tetracalcium phosphate (TTCP), dicalcium phosphate anhydrous (DCPA), dicalcium phosphate dihydrate (DCPD), octacalcium phosphate (OCP), or calcium pyrophosphate (CPP), or a mixture thereof. 4. The method as claimed in claim 1, wherein the porous material has a pore size ranging 50 to 1,000 .mu.m. 5. The method as claimed in claim 1, wherein the cell block is a minced tissue block. 6. The method as claimed in claim 1, wherein the cell block is a tissue block which is minced and enzyme-treated to release partial cells. 7. The method as claimed in claim 1, wherein the enzyme is collagenase, hyaluronidase, trypsin, or proteinase, or a mixture thereof. 8. The method as claimed in claim 1, wherein the defect site is a joint. 9. The method as claimed in claim 8, wherein the cell block is a cartilage tissue. 10. The method as claimed in claim 9, wherein the enzyme is collagenase. 11. The method as claimed in claim 1, wherein the cell block is a cell aggregate. 12. The method as claimed in claim 1, wherein the cell block is a granular carrier attached with a cell. 13. The method as claimed in claim 1, wherein the size of the cell block is larger than the pore size of the porous material. 14. The method as claimed in claim 1, wherein the cell block has a size ranging 100 to 2,000 .mu.m.

Details for Patent 8,183,041

Applicant	Tradename	Biologic Ingredient	Dosage Form	BLA	Approval Date	Patent No.	Expiredate
Bausch & Lomb Incorporated	VITRASE	hyaluronidase	Injection	021640	05/05/2004		2025-12-29
Bausch & Lomb Incorporated	VITRASE	hyaluronidase	Injection	021640	12/02/2004		2025-12-29
Amphastar Pharmaceuticals, Inc.	AMPHADASE	hyaluronidase	Injection	021665	10/26/2004		2025-12-29