In terms of oxygen delivery, the efficiency of a membrane oxygenator is influenced by:

The efficiency of a membrane oxygenator in terms of oxygen delivery is indeed influenced by both the length and diameter of the fibers.

The length of the fibers plays a critical role in the surface area available for gas exchange. Longer fibers provide a greater surface area, which enhances the contact between the blood and the membrane. This increased interaction allows for more efficient diffusion of oxygen into the blood and carbon dioxide out, thus improving overall oxygen delivery to the patient.

Similarly, the diameter of the fibers also affects the efficiency. A larger diameter can increase blood flow through the oxygenator, which can enhance the amount of oxygen absorbed, as well as potentially reduce resistance to flow. However, if the fibers are too wide, it may reduce the amount of effective surface area available for the gas exchange process.

In combination, both the length and diameter of the fibers dictate how effectively the membrane can oxygenate blood by influencing the surface area and flow characteristics, making their simultaneous consideration essential for optimizing oxygenation efficiency.