An apparatus and method for safely cannulating a blood vessels, including but not limited retinal blood vessels, is described. The network device includes input ports, a memory, an action generator, and a port vector queue. The nozzle reactor also includes a first material injector having a first material injection passage and being mounted in the nozzle reactor in material injecting communication with the injection end of the reactor body. When the outer column is displaced telescopically, a tightening rod touches a long slit in the second friction plate. BLVR can be carried out by collapsing a region of the lung, adhering one portion of the collapsed region to another, and promoting fibrosis in or around the adherent tissue.