A cross-section of a hydromorphone HCI (Hydromorphone HCI) membrane which is a type of membrane used in medical applications. The image shows the structure of the membrane including the rate-controlling membrane laser-drilled hole (point of drug release) hard shell (clear or colored overcoat) and osmotic pump (push layer).

The membrane is shown in a circular shape with a green and blue color scheme. The outermost part of the image shows a layer of water which appears to be a greenish-blue color with small white dots scattered throughout. The innermost part is a white oval-shaped structure with a hole in the center. The hole is labeled with the words "Laser-Drilled Hole" and "Hard Shell" in black text.

There is also a label on the right side of the diagram that reads "Osmotic Pump (Push layer)". This indicates that the membrane is used to control the flow of water through the membrane.

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