Patent ID: 6885881

Claim:
Apparatus for measuring human blood sugar levels, comprising: a catheter, the free end of which is to be positioned in a blood vessel, wherein the catheter comprises at least one optical waveguide, a light source for coupling light into the at least one optical waveguide, a point of measurement at the free end of the catheter at which point the light is emitted from the at least one optical waveguide, wherein the light is dispersed by the blood and/or transmitted through the blood and wherein the dispersed and/or transmitted light is coupled again into the at least one optical waveguide, a detector to receive the light which is returned, a computer unit for analysing the light received by the detector, a cleansing device located at the point of measurement for removing the tissue particles deposited from the blood, the cleansing device comprises a controllable actuator which frees or wipes clear a light emission orifice of the at least one optical waveguide when activated, and the cleansing device is controllable by the computer unit.