A tonometer structure (100) for permanently monitoring a patient' s arterial pressure during a determined time comprising a support body (10) that can be worn by a patient (50), a detection unit (150) mounted to the wearable support body (10). The support body (10) and the detection unit (150) are configured such that the detection unit, in use, can contact the patient's skin (50) proximate to an artery path (52). The detection unit (150) has a plurality of piezoresistive pressure sensors (20) each of which is configured to measure a pressure variation when the detection unit (150) can contact the patient's skin, and configured to provide a respective measurement signal (25) associated with a respective sphygmic wave of a determined amplitude. Furthermore, a control unit (30) is arranged to receive the measurement signals (25) and to recognize a reference signal (26) associated with a respective reference sensor (21) and at least one boundary signal (27) associated with a respective boundary sensor (22). Furthermore, a means is provided for actuating (34) said recognition means (32) at predetermined instants (t1, t2, t3, tn) for determining a relative reference sensor (21) at each instant (t1, t2, t3, tn), such that also in the case of an accidental movement of the detection unit (150) with respect to said artery path (52) a reference sensor (21) is always recognized.La présente invention porte sur une structure de tonomètre (100) pour surveiller de manière permanente une pression artérielle de patient durant un temps déterminé, comprenant un corps de support (10) qui peut être porté par un patient (50), une unité de détection (150) montée au corps de support portable (10). Le corps de support (10) et l'unité de détection (150) sont configurés de telle sorte que l'unité de détection, en utilisation, vient en contact avec la peau du patient (50) proche d'un trajet artériel (52). L'unité de détection (150) a une pluralité de capteurs de pression piézorésistifs (20) do
