The ornamental design for an ampoulestand, as shown and described.
FIG. 1 is a perspective view of the ampoule stand;
FIG. 2 is a top plan view of the ampoule stand shown in FIG. 1;
FIG. 3 is a rear elevation view of the ampoule stand shown in FIG. 1;
FIG. 4 is a front elevation view of the ampoule stand shown in FIG. 1;
FIG. 5 is a left side elevation view of the ampoule stand shown in FIG. 1; and,
FIG. 6 is a right side elevation view of the ampoule stand shown in FIG. 1.
The broken lines in the drawing depict the boundary of the claim. It is understood that the claim extends to the boundary but that the boundary forms no part of the claim