The ornamental design for a spreadablemediastinoscope, as shown and described.
FIG. 1 is a top, right side perspective view of a spreadable mediastinoscope in accordance with the new design;
FIG. 2 is a right side perspective view thereof;
FIG. 3 is a left side perspective view thereof;
FIG. 4 is a front perspective view thereof;
FIG. 5 is a rear perspective view thereof;
FIG. 6 is a bottom perspective view thereof; and,
FIG. 7 is a top perspective view thereof.
The broken line showing in FIGS. 1, 2, 4, 5 and 7 is included for the purpose of illustrating portions of the spreadable mediastinoscope that form no part of the claimed design.