the anastomosis devices of the invention advantageously provide reinforcement structures or components that increase the strength and / or flexibility of the device . these features can be especially beneficial to protect the integrity of the installation of the device within a patient to facilitate the healing process . these features may provide resistance to tearing or ripping of the catheter body or sheath by the tissue approximating structures and / or may provide strength in other areas of the catheter body . the anastomosis devices of the invention may further include method and devices for placing markers on the anastomosis device to facilitate accurate placement of the device within the patient .