Biostable glucose permeable polymer

A method for making a glucose sensor comprising the steps of:

• (a) combining together an isocyanate, a polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol having an average molecular weight (Mr) of from about 600 to about 1200 Daltons;
• and a terephthalate;
• (b) allowing the combination of (a) to form a polymeric composition having a glucose permeability of at least 1×10−8 cm2/s at 37° C. in phosphate buffered saline;
• (c) using an extrusion process to mold the polymeric composition into a tubular housing having a first end and a second end.

A hydrophilic polyurea composition shaped to form a tubular housing, and formed by combining:

• an isocyanate,
• a polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol having an average molecular weight (Mr) of from about 600 to about 1200 Daltons;
• and
• a terephthalate;
• wherein:
• the hydrophilic polyurea composition has a glucose permeability of at least 1×10−8 cm2/s at 37° C. in phosphate buffered saline and
• wherein the hydrophilic polyurea polymeric composition is biostable such that the tubular housing has less than a 5% weight loss after 7 days of implantation in vivo.