drawstring first loop 22 held on the catheter by pinching and then gradually the mesh formed of crocheted material extending around the prosthesis and holding the latter in its compressed state can be stripped through said end knot since the meshes are wrapped alternately right and left around prosthesis 15 when the mesh is stripped the threads on the right and left sides of the catheter are released alternately from the corresponding mesh knots and after the mesh facing the distal end comes loose initial segment 17 of the thread material can be pulled out of its pinched position in slot 18 at distal end 12 of catheter 11 in an enlarged view fig2 and 3 show the mesh formation with alternate front and back wrapping of catheter 15 which in these figures is shown as a rigid tubular structure for the sake of simplicity after securing initial section 17 of the thread material in the manner shown in fig1 by pinching in slot 18 the thread is wrapped around the catheter then a loop 26 is pulled through under the thread and then from free thread material 27 a mesh on the back of the catheter is pulled around the latter and passed through loop 26 whose section pulled through the above loop 26 in turn forms a loop 28 to form the next mesh fig2 shows free thread material 27 in solid lines before it is pulled through loop 26 and shows it in dashed lines after it is pulled through this loop and forms loop 28 for the next mesh to form the next mesh as shown in fig3 forming another loop 30 in the manner shown by the dashed lines the free thread material is pulled out of the position shown at 31 in front of.