The ornamental housing for a medicalinjector, as shown and described.
FIG. 1 shows a perspective view of the housing for a medical injector viewed from the front and left of and above the medical injector with a cap portion of the housing removed from a proximal portion of the housing;
FIG. 2 shows a front end view of the housing for a medical injector;
FIG. 3 shows a rear end view of the housing for a medical injector
FIG. 4 shows a left side view of the housing for a medical injector;
FIG. 5 shows a right side view of the housing for a medical injector;
FIG. 6 shows a bottom view of the housing for a medical injector; and,
FIG. 7 shows a top view of the housing for a medical injector.
The broken line showing is for the purpose of illustrating portions of the article and forms no part of the claimed design. The broken line which defines the bounds of the claimed invention forms no part of the claimed design.