<;P>;PROBLEM TO BE SOLVED: To solve the problem in PTCA (Percutaneous Transluminal Coronary Angioplasty) or PTA (Percutaneous Transluminal Angioplasty), wherein a medical treatment catheter is bent in a guide catheter to lower axial pressing performance and torque transmitting performance. <;P>;SOLUTION: This catheter support, which is used in combination with the medical treatment catheter, includes a shaft part shaped to limit the radial movement of the medical treatment catheter extending over a fixed axial length in the interior of the guide catheter or a sheath introducer. This catheter support is thus used in combination with the medical treatment catheter, whereby the medical treatment catheter can be restrained from bending in the guide catheter to improve the axial pressing performance and torque transmitting performance of the medical treatment catheter. <;P>;COPYRIGHT: (C)2010,JPO&INPIT