The ornamental design for a supportinstrument for a medical monitor, as shown and described.
FIG. 1 is a perspective view of a support instrument for a medical monitor, showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a right side elevational view thereof; and,
FIG. 8 is an enlarged end view thereof, taken along the line 8-8 in FIG. 2, with its internal mechanisms omitted.
The broken lines showing in FIG. 8 of the thickness and interior surface of the support instrument for a medical monitor are for environmental purposes only and form no part of the claimed design.