Angioplasty balloon catheter and adaptor

A balloon catheter assembly comprising:

• an elongated first tubular member having proximal and distal portions terminating respectively in proximal and distal ends and having a lumen therein,
• an adaptor, attached to said first tubular member for connecting a source of fluid pressure to said first tubular member,
• a balloon membrane having proximal and distal ends, wherein its proximal end is attached to said first tubular member,
• a second tubular member having proximal and distal portions terminating respectively in proximal and distal ends and a lumen therein, wherein the distal end of said membrane is attached to said second tubular member, said second tubular member extending at least from near the distal end of said membrane to said first tubular member, but not substantially into said first tubular member for a major portion of said first tubular member's overall length,
• a balloon chamber defined by said membrane and its attachment at one end to said first tubular member and at its other end to said second tubular member, wherein said chamber is in communication with the lumen of said first tubular member and wherein, when not inflated, said balloon chamber extends distally of the distal end of said first tubular member,
• a guide wire having proximal and distal portions terminating respectively in proximal and distal ends, extending at least from the proximal portion of said first tubular member through the distal end of the second tubular member, wherein said guide wire is not fixedly attached to said second tubular member or to said balloon membrane or to said distal portion of said first tubular member,
• means for preventing the distal end of said second tubular member from entering the lumen of said first tubular member,
• means for limiting the axial motion of said guide wire relative to said first tubular member, and
• means for applying axial force to the distal end of said balloon membrane.