A computer-assisted microsurgery installation, comprising: (a) an articulated tool support, one end of which is integral with a fixed reference frame R.sub.c ; (b) an image data base comprising images in an image reference frame R.sub.i ; (c) at least two sensors, integral with the fixed reference frame R.sub.c, supplying a signal that is a function of the position of a reference frame R.sub.p of a patient in the fixed reference frame R.sub.c ; (d) a computer adapted to: (1) determine correspondence of a reference frame R.sub.o of the tool with the patient reference frame R.sub.p and the image reference frame R.sub.i as a function of the signal from the at least two sensors; (2) output a display signal for visualization of position of the tool in the image reference frame R.sub.i on a control screen; and (3) control position and displacements of the tool as a function of control signals originating from a control unit, wherein the fixed reference frame R.sub.c is independent of the patient reference frame R.sub.p and of the image reference frame R.sub.i ; and (e) means for determining coordinates of the tool in the fixed reference system R.sub.c based on data from the image data base. view more

The installation of claim 1, wherein the at least two sensors comprise at least two acquisition cameras integral with the fixed reference system R.sub.c and positioned such that their field of observation includes a surgical intervention zone.

The installation of claim 2, further comprising a first geometrically defined trihedron, presenting at least four non-coplanar punctiform light sources integral with the tool, with the mobility space of the first trihedron being contained in the fields of vision of the acquisition cameras. view more

The installation of claim 3, further comprising a second geometrically defined trihedron, presenting at least four non-coplanar punctiform light sources integral with the patient, with the mobility space of the second trihedron being contained in the fields of vision of the acquisition cameras during an entire operative phase. view more

The installation of claim 1, wherein the means for determining coordinates of the tool in the fixed reference system R.sub.c comprises at least two acquisition cameras integral with the fixed reference system R.sub.c and positioned such that their field of observation includes the mobility space of the tool. view more

The installation of claim 5, further comprising a first geometrically defined trihedron, presenting at least four non-coplanar punctiform light sources integral with the tool, with the mobility space of the first trihedron being contained in the fields of vision of the acquisition cameras. view more

The installation of claim 6, further comprising a second geometrically defined trihedron presenting at least four non-coplanar punctiform light sources integral with the patient, with the mobility space of the second trihedron being contained in the fields of vision of the acquisition cameras during an entire operative phase. view more

The installation of claim 1, further comprising an additional sensor comprising a pointing end and at least two light points, the positions of which in relation to the pointing end are determined geometrically by placing the additional sensor within the fields of vision of the at least two sensors. view more

The installation of claim 1, wherein: the at least two sensors comprise at least two acquisition cameras integral with the fixed reference system R.sub.c and positioned such that their field of observation includes a surgical intervention zone and the mobility space of the tool; and further comprising: a first geometrically defined trihedron, presenting at least four non-coplanar punctiform light sources integral with the tool, with the mobility space of the first trihedron being contained in the fields of vision of the acquisition cameras; a second geometrically defined trihedron, presenting at least four non-coplanar punctiform light sources integral with the patient, with the mobility space of the second trihedron being contained in the fields of vision of the acquisition cameras during an entire operative phase; and an additional sensor comprising a pointing end and at least two light points, the positions of which in relation to the pointing end are determined geometrically by placing the additional sensor within the fields of vision of the acquisition cameras. view more