A cryoablation system, wherein, the cryoablation system comprises: a gas source which provides a working nitrogen gas at room temperature and at a constant set pressure; a liquid generator which is coupled to the gas source to receive the working gas, and which then generates a working cryogen fluid; and a catheter coupled to the liquid generator for receiving the working cryogen, the catheter having a distal end having a freezing element which delivers the working cryogen to a treatment location, and a flexible soft tip made from a biocompatible soft material that has a radiopaque characteristic, and the catheter also having a balloon (303; or 1303) enclosing the freezing element; wherein the freezing element circulates the cryogen fluid from a connector section to the distal section of the catheter through a continuous pathway comprising, at said distal end, a single-loop and an un-insulated section of delivery tube; wherein the axis of the loop is not concentric, but is perpendicular to axis of the catheter's outer lumen; wherein the balloon extends beyond both sides of the distal end, with a proximal side forming an airtight seal with a balloon delivery tube 305; the balloon delivery tube is configured to carry balloon fluid from a balloon connector port of a three-way connector; wherein a distal end of the balloon forms an airtight seal with a catheter tip outer tube; the catheter tip outer tube is made from the same material as balloon delivery tube; the internal cavity of the catheter tip outer tube is filled with biocompatible epoxy forming a rounded outer epoxied tip for ease of insertion through the vessel; wherein a stainless steel spring wire is - embedded within the epoxied tip on one end thereof, and - soldered or brazed at the other end thereof to the single-loop to simulate an extended distal end. a gas source which provides a working nitrogen gas at room temperature and at a constant set pressure; a liquid generator which is coupled to the gas source to receive the working gas, and which then generates a working cryogen fluid; and a catheter coupled to the liquid generator for receiving the working cryogen, the catheter having a distal end having a freezing element which delivers the working cryogen to a treatment location, and a flexible soft tip made from a biocompatible soft material that has a radiopaque characteristic, and the catheter also having a balloon (303; or 1303) enclosing the freezing element; wherein the freezing element circulates the cryogen fluid from a connector section to the distal section of the catheter through a continuous pathway comprising, at said distal end, a single-loop and an un-insulated section of delivery tube; wherein the axis of the loop is not concentric, but is perpendicular to axis of the catheter's outer lumen; wherein the balloon extends beyond both sides of the distal end, with a proximal side forming an airtight seal with a balloon delivery tube 305; the balloon delivery tube is configured to carry balloon fluid from a balloon connector port of a three-way connector; wherein a distal end of the balloon forms an airtight seal with a catheter tip outer tube; the catheter tip outer tube is made from the same material as balloon delivery tube; the internal cavity of the catheter tip outer tube is filled with biocompatible epoxy forming a rounded outer epoxied tip for ease of insertion through the vessel; wherein a stainless steel spring wire is - embedded within the epoxied tip on one end thereof, and - soldered or brazed at the other end thereof to the single-loop to simulate an extended distal end. - embedded within the epoxied tip on one end thereof, and - soldered or brazed at the other end thereof to the single-loop to simulate an extended distal end.