Polymer for controlled diffusion of glucose

Hey guys,

I'm trying to find a polymer for a controlled diffusion of glucose. Currently, I am using membrane systems, but I have to punch them manually and handle them with a tweezer so that it could happen that the membranes are being harmed which leads to different pore distribution. 
Is there a reliable way to produce polymer matrices for controlled diffusion of glucose in a reliable and reproducible way?

Best Regards,
Moe