System for positioning on a patient an observation and/or intervention device

A system for controlling with respect to a patient's body the extremity of an observation and/or intervention device having a portion penetrating into the patient's body via a trocar, comprising:

• a base adapted to be laid on the patient's body;
• first means for supporting and orienting the device formed of a first portion rotatably assembled on the base according to a connection with one degree of freedom, and of a second portion rotatably assembled on the first portion according to a connection with one degree of freedom;
• second means connected to the device for translating the device with respect to the second portion;
• and
• a first actuator for actuating the first portion with respect to the base, and a second actuator for actuating the second portion with respect to the first portion,
• wherein at least one of the base and the first portion comprises an external surface configured to engage with a complementary drive gear coupled to the first actuator,
• wherein the base delimits a circular opening around the device and in which the first portion is a mobile ring with an axis substantially perpendicular to the patient's body and with an inner diameter substantially corresponding to the circular opening, the mobile ring being rotatably assembled on the base around its axis, and
• wherein the second portion comprises a head coupled to the device prolonging at least in an arm pivotally assembled on the mobile ring along an axis substantially tangent to the patient's body.