Everting toposcopic dilation catheter

A toposcopic dilation catheter for insertion into a body passageway, comprising:

• (a) a catheter shaft for inserting into the body passageway, wherein said catheter shaft includes a distal end, an outer surface and an axial passage extending therethrough;
• (b) a slide tube coaxially positioned within said axial passage, wherein said slide tube includes a distal end;
• (c) an everting tube carried within said axial passage, said everting tube having one end bonded to the distal end of said slide tube and the opposite end bonded to the distal end of said catheter shaft, wherein the everting tube may be everted under fluid pressure;
• (d) first balloon means carried on the outer surface of said catheter shaft, wherein said balloon means may be expanded under fluid pressure;
• and
• (e) second balloon means mounted at the distal end of said slide tube.

In a catheter having an inner catheter shaft with a leading end and an outer surface, an everting flexible catheter tube bonded to said outer surface adjacent said leading end, and a balloon integral to said outer surface of said inner catheter shaft, a method of canalizing of blood clot in a blood vessel comprising the steps of:

• (a) inserting the catheter into the blood vessel and advancing the leading end of the inner catheter shaft to the region of the blood clot;
• (b) penetrating the blood clot with the leading end of the inner catheter shaft;
• (c) inflating the balloon carried about the leading end of the inner catheter shaft;
• and
• (d) removing the blood clot by withdrawing the catheter from the blood vessel while the balloon is inflated.

In a catheter device having an outer catheter shaft with a leading end and an outer surface, a slide tube with a leading end coaxially positioned within said outer catheter shaft, an everting flexible catheter tube having one end bonded to said leading end of the outer catheter shaft, a first balloon integral to said outer surface of said outer catheter shaft, a second balloon carried about the leading end of said slide tube, wherein the opposite end of said everting flexible tube is bonded to said slide tube rearward of said second balloon, a method of canalizing a blocked blood vessel comprising the steps of:

• (a) inserting said outer catheter shaft into the blood vessel and advancing the leading end of the catheter shaft to the region of the blood clot;
• (b) anchoring the outer catheter shaft in the blood vessel by expanding said first balloon under fluid pressure;
• (c) everting said flexible outer catheter tube under fluid pressure and simultaneously advancing the leading end of said slide tube beyond the leading end of said outer catheter shaft;
• (d) penetrating the blood vessel blockage with the leading end of said slide tube;
• and
• (e) inflating the second balloon to canalize the blood vessel.