Create a single editable vector SVG of a reusable insulin injection pen, shown fully assembled in horizontal side view, inspired by the uploaded medical instruction reference. The pen must be slim, elongated and medically realistic, with clean proportions similar to a real insulin pen device. Visual structure from left to right: rounded protective cap covering the needle end transparent cartridge holder section showing a narrow insulin reservoir inside subtle rubber stopper detail inside the cartridge smooth white main pen body with a soft light-lilac curved accent small dose display window near the right end narrow dose selector ring small injection button at the far right Style requirements: clean pharmaceutical medical illustration editable SVG vector artwork orthographic side view only horizontal composition thin soft-gray outlines, not black white and very light gray body subtle lilac accents minimal soft shading only accurate, elegant and simple suitable as a medication icon inside a clinical app transparent background Do not include: text, labels, arrows, instructions, multiple views, exploded parts, diagrams, hands, logos, brand names, thick black strokes, cartoon style, marker pen appearance, syringe appearance, 3D perspective, background, borders or decorative elements.

The image shows a black and white drawing of a fountain pen on a white background. The pen has a sleek, modern design with a black body and a silver clip. The tip of the pen is slightly curved and the body is slightly tapered. The background is a bright white, providing a stark contrast to the pen.