tube 102 has a polished surface with a knurled distal end portion and carries within it an end piece 104 which is cut with flat edges 105 running from a point past the axis of the tube at approximately an 11 degree angle to form a tissue engagement opening 106 and a spherical end 107 the end piece 104 is secured to tube 102 by brazing although other means can be used the end piece runs approximately 0 570 inches in length the outer tube 102 has an outer diameter of 0 134 inches and an inner diameter of 0 1150 inches mounted inside the outer tube 102 is a cutting tube 110 which has a sharpened cutting tip 112 and knurled distal end portion 114 the cutting tube defines a lumen 111 therethrough communicating between a tissue cutting surface 109 at distal cutting tip 112 and deflection chamber 66 adjacent the proximal end of the cutting tube the cutting this tube is seen in fig1 16 16 a 16 b the cutting tip 112 is ground flat as shown at 113 in fig1 a and 16 b 0 007 inches deep and has a closed spherical end 116 the cutting tube 110 has an outer diameter of 0 1149 inches.