Apparatus, including a flexible insertion tube,having a distal segment that is configured to be insertedinto a body organ. A plurality of elastic branches areconnected to the distal segment of the insertion tube atdifferent, respective locations and extend transverselyaway from the insertion tube at the respective locations.There are one or more respective electrodes disposed oneach of the elastic branches and there are conductorstraversing the elastic branches so as to couple theelectrodes to the insertion tube.
