The ornamental design for a medical apparatus, as shown and described.
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FIG. 1 is a front elevational view of a first embodiment of a medical apparatus.
FIG. 2 is a left side perspective view thereof.
FIG. 3 is a right side perspective view thereof.
FIG. 4 is a front elevational view of a second embodiment of a medical apparatus.
FIG. 5 is a left side perspective view thereof; and,