Medical devices including vascular access kits and related system and methods are disclosed. In some embodiments, a vascular access system may include a first conduit, a second conduit, and an expandable stent that is coupled to both the first and second conduits such that there is a continuous lumen between the first conduit and the second conduit. Methods of deploying the vascular access system within the body of a mammal, more particularly, a human patient are disclosed. Methods of bypassing a section of vasculature of a mammal, more particularly, a human patient are disclosed. The vascular access system, when implanted and assembled, may be a fully subcutaneous surgical implant.