. . . . . . " the double spiral PFO closure clamp of FIG. 10 and with one half of the central connector of FIG. 13 formed thereon; FIGS. 16A and 16B are a plan view and a view in side elevation, respectively, of the jig of FIGS. 14A and 14B with the right atrial spiral section of the double spiral PFO closure clamp of FIG. 10 and with one half of the central connector of FIG. 13 formed thereon; FIGS. 17A and 1" .