Patent ID: 7689258

Claim:
A device ( 1 ) for examination of biological tissue, comprising: a light introduction means ( 102 ) configured to introduce visible and/or near-infrared light into the biological tissue, a detector ( 104 ) configured to transform light signals emitted from the biological tissue into detection signals, an output device ( 130 ) associated with the detector ( 104 ) and configured to output information derived from the detection signals, a shield ( 20 ; 106 ), the light introduction means ( 102 ) and the detector ( 104 ) being embedded in the shield, a grip part ( 10 ) forming a housing configured to receive at least one of an energy source, a display unit, an evaluation unit, and an entry keypad, the grip part ( 10 ) being rigidly connected with the shield ( 20 ) via a connecting piece, a checking device configured to verify appropriate positioning of at least one of the light introduction means ( 102 ), the detector, and the shield ( 20 ; 106 ) relative to a substrate, wherein the shield ( 20 ; 106 ) includes an area between the light introduction means ( 102 ) and the detector ( 104 ), whereby the light introduction means, the detector ( 104 ) and therebetween lying areas of the shield ( 20 ; 106 ) are configured to be brought into contact with a surface of the substrate such that the shield ( 20 ; 106 ) during operation of the light introduction means ( 102 ) prevents the propagation of light from the light introduction means along the surface of the substrate to the detector ( 104 ).