CooperSurgical Potocky Needle (Different Versions) Versions: CooperSurgical 6066 Potocky Needles. Box of 6. This product is a substitute for Wallach 920021.CooperSurgical 433-132 Needle Extender, 4" Box of 1CooperSurgical 433-133 Needle Extender, 5" Box of 1CooperSurgical 433-134 Needle Extender, 6" Box of 1 The Potocky Needle is designed for injection of solutions (such as 2% Lidocaine with or without 1:100,000 epinephrine) into the cervix and vaginal wall. Local anesthetics are...