Patent ID: 8229546

Claim:
A microdialysis catheter comprising a multilumen tube and a tubular membrane, said tube including two longitudinally arranged inner flow channels, said two longitudinally arranged inner flow channels representing an in-flow channel and an outflow channel, respectively, said flow channels extending from a proximal end of the tube to a distal end of the tube, wherein through-holes are provided, one from each of said two flow channels to the outside of said tube, said flow channels are blocked for passage of liquid distally of the respective through-holes, and the tubular membrane is arranged circumferentially around the tube such as to cover the two through-holes, wherein said tubular membrane is sealingly fastened to the tube, thereby forming a single dialysis chamber arranged between the tube and the tubular membrane and extending around their respective circumferences, wherein the flow channels are adapted to provide the same flow rate for the total in-flow, the total out-flow and the dialysis chamber flow, thus allowing a flow rate of 1-15 μl/minute, and wherein the tubular membrane is arranged such as to have a selective layer on the outer circumference of the tubular membrane to allow microdialysis of a target analyte.