first embodiment 100 in that the second embodiment 100 a has a sloping surface 136 a in the form of a curve when viewed in cross section sloping surface 136 a connects between the aspiration passage opening 140 a and the second interior surface 137 a the curved sloping surface 136 a is defined by a radius u201c r u201d and forms a connoid shape in three dimensions while forming a convex curve in two dimensions the radius u201c r u201d of the sloping surface 136 a is preferably between 0 35 to 0 9 mm this connoid shape of the sloping surface 136 a may reduce the amount of removed tissue material that is deflected from the sloping surface 136 a and thus improving the efficiency of the aspiration of the needle 100 a in needle where the body has a radially offset portion 134 a fig6 illustrates a third embodiment of a phacoemulsification needle 100 b that differs only from the second embodiment 100 a in that the third embodiment 100 b has a lip 114 b that is generally square in shape tip 102 b has a lip 114 b with two side edges 115 b an upper edge 118 b and a lower edge 116 b as can be seen in fig7 the third embodiment of the needle.