A quick exchange guide unit, comprising: an elongated support element (3, 4 ')； a guide wire element (11, 12 ') having a guide wire lumen (13, 14') with a distal guide wire opening (15, 16 ') and a proximal guide wire opening (17, 18'), the guidewire element being located near a distal end of the elongated support element (3, 4 ') and being adapted to receive a guidewire, and an inner diameter of the guidewire lumen less than 3 mm； a single sensor (19, 20 '), being located near a distal end of the elongated support element, the sensor (19, 20') being adapted to measure a parameter in a living body and to generate a detected signal based on the parameter measured such that the detected signal can be applied to a signal processing unit adapted to process the detected signal and to generate a processed detected signal, characterized in that a wall of the elongated support element (3, 4 ') is laminated of As consisting of an inner layer and an outer layer, the sensor (19, 20 ') is disposed between the inner layer and the outer layer, and the quick exchange guide unit further comprises a signal transmission line running longitudinally to along the elongated support element (3, 4 ') from the sensor to a proximal end of the quick exchange guide unit, the signal transmission line being located above an outer surface the top of the inner layer of the elongated support element (3, 4 ') z below an outer surface of the outer layer of the elongated support element (3, 4').Una unidad guía de intercambio rápido, que comprende: un elemento de soporte alargado (3, 4')； un elemento cable guía (11, 12') que tiene un lumen del cable guía (13, 14') con una abertura de cable guía distal (15, 16') y una abertura de cable guía proximal (17, 18'), estando situado el elemento cable guía cerca de un extremo distal del elemento de soporte alargado (3, 4') y estando adaptado para recibir un cable guía, y siendo un diámetro interior del lumen del cable guía menor de 3 mm； un único sensor (19, 20
