The present invention relates to medical implants such as stents, which can be coated with a biodegradable membrane containing or not an active ingredient or medicament, their method of preparation and their use. The present invention provides for a biodegradable membrane covered endovascular device. The device is coated with a solution comprising chitosan and chitosan plasticizer or cross-linker, the solution which when dried thereon, upon rehydration, forms a flexible polymeric membrane on the device, or which when freeze-dried thereon, forms upon rehydration a porous flexible polymeric membrane.
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