Patent ID: 7670540

Claim:
A method for manufacturing a balloon catheter comprising the steps of: primarily extruding an elongated lumen tube upward in a vertical direction by using a T-shaped die provided in a primary extruder, perforating inflation apertures through a non-vulcanized lumen tube at an interval of approximately 37 cm by using a non-contact type laser perforation device provided above the T-shaped die of the primary extruder, each inflation aperture having a width of 0.3 mm and a length of 2 to 3 mm, printing tube cutting positions on the non-vulcanized lumen tube at positions uniformly spaced apart from the inflation apertures by using a non-contact type printer provided above the laser perforator, simultaneously with the perforation of the inflation apertures, primarily vulcanizing the lumen tube, having passed through the perforation and printing processes, by using a primary vulcanizer provided above the printer, drawing the lumen tube by using a drawer including drawing and guide rollers, in order to prepare a primary curing of the lumen tube, stationary drooping the drawn lumen tube at a position just before a bond preventing agent applicator and intermittently feeding the lumen tube whenever the bond preventing agent applicator completes a foregoing bond preventing agent coating operation, uniformly coating a bond preventing agent layer on an outer peripheral surface of the lumen tube over the inflation apertures, drying the lumen tube, which was completely coated with the bond preventing agent layer using the bond preventing agent applicator, with hot air having a temperature of approximately 150° C., and intermittently transferring the dried lumen tube to a secondary extruder tube feeding roller, secondarily extruding the dried lumen tube by using the secondary extruder, when the dried lumen tube is fed to the second extruder after stationary dropping several times via the second extruder tube feeding roller, secondarily vulcanizing the secondarily extruded lumen tube by using a secondarily vulcanizing device provided below the secondary extruder, uniformly cutting the lumen tube, having passed through the secondary extrusion and vulcanization processes, to tube pieces by using a tube cutter based on the printed tube cutting positions of the lumen tube, each tube piece having a length suitable for forming a tip at one end thereof, forming a tip at one end of each tube piece by dipping the end of the tube piece into liquid-phase silicon rubber (LSR) while applying a negative pressure to an inflation lumen of each tube piece, and finish vulcanizing the tube pieces, each formed with the tip, at a temperature of approximately 125° C. for approximately 25 minutes, and perforating a urine drainage hole through each tube piece.