Torsion reduction system

A method, comprising:

• inserting, into a body cavity, a distal end of a flexible insertion tube comprising a proximal end, the insertion tube containing:
• an electrode mounted at the distal end,
• a first irrigation line comprising proximal and distal irrigation line ends, contained within the insertion tube, configured to supply irrigation fluid from the distal irrigation line end through one or more apertures in the distal end, and inserted through a hollow channel extending through a longitudinal axis of a slip ring unit comprising a stator and a rotor, and
• a first electrical line comprising a proximal electrical line end, which is connected to the rotor, and a distal electric line end, which is coupled to the electrode;
• receiving, from an angle sensor, a signal indicating torsion of the proximal irrigation line end and the proximal electrical line end;
• and
• rotating, by a drive mechanism, the rotor responsively to the detected torsion so as to reduce the torsion of the proximal irrigation line end and the proximal electrical line end.

A computer software product, operated in conjunction with a probe that is configured for insertion into a body cavity of a patient and includes:

• an electrode mounted at the distal tube end,
• a first irrigation line comprising proximal and distal irrigation line ends, contained within the insertion tube, configured to supply irrigation fluid from the distal irrigation line end through one or more apertures in the distal tube end, inserted through a hollow channel extending through respective a longitudinal axis of a slip ring unit comprising a stator and a rotor,
• a first electrical line contained within the insertion tube and comprising a proximal electrical line end, which is connected to the rotor, and a distal electric line end, which is coupled to the electrode,
• the product comprising a non-transitory computer-readable medium, in which program instructions are stored, which instructions, when read by a computer, cause the computer:
• to receive, from an angle sensor, a signal indicating torsion of the proximal irrigation line end and the proximal electrical line end, and
• to rotate, via a drive mechanism, the rotor responsively to the detected torsion so as to reduce the torsion of the irrigation line and the electrical line.