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

Claim 0:
1. 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,
wherein the one or more zwitterionic compounds are blended with the base polymer or layered upon the base polymer.