Abstract: Devices and methods are described for emplacing bypass grafts in any tubular tract in a mammalian body by natural or percutaneous entry and suturing intraluminally. A coronary bypass is used as the preferred embodiment. Prior art devices and methods for accomplishing this object are disclosed in patents but are not in use today. The prior art in use requires opening the chest so the surgeon can get his hands or tools in to manually tie ten or more sutures on each end of each bypass, each requiring a minute to tie. This produces extensive collateral damage to the chest, dangerously long heart stoppage, intensive care, excruciating pain and months of recovery. The devices of the present disclosure cause the patient no collateral damage, little discomfort, probably no more than overnight in hospital, and complete recovery within days. The devices are introduced percutaneously and advanced intraluminally by catheters with fluoroscopic, radiographic and other electromagnetic means of tracking through the body.