Infusion set assembly

The design is the visual features of the Infusion Set Assembly shown in solid lines in the drawings, whether those features are features of one shape, configuration, ornament or pattern or are a combination of any of these features. Stippled lines do not form part of the design.Fig. 1 is a top perspective view of an infusion set assembly;Fig. 2 is a top rear perspective view thereof;Fig. 3 is a bottom perspective view thereof;Fig. 4 is a top plan view thereof;Fig. 5 is a front elevational view thereof;Fig. 6 is a left side elevational view thereof;Fig. 7 is a right side elevational view thereof;Fig. 8 is a rear elevational view thereof; andFig. 9 is a bottom plan view thereof.Drawings of the design are included.