filter device of FIG. 15a. [0047]FIGS. 16a and 16 b respectively are a side elevational view and a plan view of another access system in accordance with the principles of the present invention. [0048]FIGS. 17a, 17 b and 17 c respectively are a side elevational view, a plan view and a cross-sectional view of another delivery system tube in accordance with the principles of the present invention. [0