System for determining location inside body

A system for in vivo location determination of a balloon catheter, the system comprising:

• a radiation detector including a hand bar type probe configured to detect radiation radiated from a radioactive material and to indicate, by a sound and a radioactive count, that the radioactive material is adjacent to the hand bar type probe, wherein as a distance between the hand bar type probe and the radioactive material becomes shorter, the sound becomes louder and the radioactive count increases;
• a guide wire provided to be inserted into a body;
• an intermediate member which has a first radioactive material detected by the radiation detector, and is configured to be inserted into the body along an outer diameter of the guide wire to set an insertion length for inserting a balloon catheter, wherein the set insertion length is determined based on a length of the intermediate member inserted up to a location of the first radioactive material, the first radioactive material being detected and indicated by the hand bar type probe positioned at an external portion of the body corresponding to a target site;
• and
• the balloon catheter configured to be inserted into the body along the outer diameter of the guide wire, and configured to be inserted into the body by the set insertion length determined based on the insertion of the intermediate member, and configured to be coupled to the guide wire,
• wherein the intermediate member has a first hollow portion through which the guide wire passes,
• wherein the balloon catheter comprises:
• a tube having a second hollow portion through which the guide wire passes;
• and
• a balloon member filled with a balloon expansion composition in a fluid phase in which a second radioactive material is mixed and provided to be inflatable on the tube;
• wherein the balloon member is configured to be coupled to the guide wire after the intermediate member is removed from the guide wire, the balloon member is inserted along the guide wire by the set insertion length, and
• wherein the first radioactive material and the second radioactive material include one or more radioactive isotopes that emit gamma rays or beta particles, the radioactive isotopes being selected from a group consisting of 99 mTc, 18F, 123I, and 131I.