A - Human Necessities – 61 – L
Patent
A - Human Necessities
61
L
A61L 27/00 (2006.01) A61F 2/06 (2006.01) A61L 27/24 (2006.01) A61L 27/50 (2006.01) A61L 33/00 (2006.01) A61F 2/00 (2006.01)
Patent
CA 2136832
A method of forming a tissue equivalent is described. A length of polyester tube is threaded over a mandrel (H) and attached at either end by clips at A and D. A block (F) is then screwed into place. The polyester is then pre-soaked by injecting through Tap (2) an acidified collagen solution for approximately one hour. After a suitable period of time the excess solution is aspirated off. Following this stage, a second, alkaline solution is injected into the apparatus which contains smooth muscle cells (SMC). Thus, neutralisation of the collagen impregnated within the fabric of the tube occurs leading to spontaneous fibrillogenesis within the interstices of the cloth, eliminating the risk of delamination. The apparatus is then incubated. The collagen contracts down onto the fabric tube and the cell-impregnated gel becomes incorporated into the presoaked collagen. The pre-impregnated collagen and the collagen provided in the aqueous mixture contract down as one into a coherent whole with the SMC. The tissue equivalent is then lined with endothelial cells and the apparatus again incubated and fed at increasing intraluminal pressures applied either statically or dynamically. This is believed to cause the vessel to become preconditioned to the pressure it will work under as an implant. This allows organisation of the basement membrane which in turn promotes EC attachment and theoretically prevents smooth muscle cell hyperplasia.
Browne Tom
Davies Alban
Haynes Sarah
Kearney John
Mccarthy Tetrault Llp
Tissuemed Limited
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