A hysteroscopic system, comprising: a hysteroscope (300) having a main body (325), coupled to an extension portion (328), wherein the extension portion is configured to extend transcervically to the uterine cavity of a patient； a first, second and third channels (102, 106, 108a, 108b, 320) extending from the main body to a distal end of the extension portion； a source (120) of fluid, which can be coupled to a proximal end of the first channel； a pressure sensor (335), which can be coupled to a proximal end of the second channel； and a tissue resection probe (305), configured for introduction through the third channel, wherein the third channel has a straight channel portion (335B), which extends longitudinally through the extension portion, and a proximal channel portion (355A) extending through the main body； characterized in that: the proximal channel portion (355A) is configured to provide a selected level of resistance to axial sliding of the tissue resection probe (305), through the third channel, while allowing rotation of the probe within the third channel, because a central axis (356A) of the proximal channel portion of the third channel is offset and is not parallel with respect to a hypothetical central axis (356B) of the straight channel portion of the third channel, on a proximal face (360) of the main body.Un sistema histeroscópico, que comprende: un histeroscopio (300) que tiene un cuerpo principal (325), acoplado a una porción de extensión (328), en donde la porción de extensión está configurada para extenderse transcervicalmente hasta la cavidad uterina de una paciente； un primer, segundo y tercer canales (102, 106, 108a, 108b, 320) que se extienden desde el cuerpo principal hasta un extremo distal de la porción de extensión； una fuente (120) de fluido, que puede acoplarse a un extremo proximal del primer canal； un sensor de presión (335), que puede acoplarse a un extremo proximal del segundo canal； y una sonda de resección de tejido (305), configura
