Patent ID: 11864891
Assignee: DEXCOM, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 13:
14. A device for measurement of a concentration of an analyte, the device comprising:
a sensor configured to generate a signal associated with the concentration of the analyte; and
a sensing membrane located over the sensor, the sensing membrane comprising:
a diffusion resistance domain configured to control a flux of the analyte therethrough, wherein the diffusion resistance domain comprises:
a base polymer comprising a polyurethane or a polyurethane copolymer comprising both hydrophilic and hydrophobic regions; and
one or more zwitterionic compounds, wherein the one or more zwitterionic compounds comprise a betaine compound or derivative thereof; and

a bioprotective domain located over the sensing membrane and including the one or more zwitterionic compounds, precursors, or derivatives thereof,
wherein the one or more zwitterionic compounds are blended with the base polymer or layered upon the base polymer.