the device of the invention consists of a plurality of tubular cannulae , which prior to the surgery , are linked together at their distal ends by flexible elements , such as wires or threads . all the threads , the number of which is one less than the number of the used cannulae , are passed through one of the cannulae and the distal ends of the threads are either attached to the walls of other cannulae , at their distal ends , or pulled back through one of the cannula forming the loop at the distal end and fixed at the proximal end of the cannula . during surgery , the cannulae with their distal ends being linked are inserted into the patient &# 39 ; s body through an incision and then the cannulae are used for guiding various surgical tools . due to flexible linking of the cannulae at their distal ends , the cannulae can be easily manipulated without disconnection and without a need for use extraneous x - raying for reorientation of the cannulae .