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1. WO2000033910 - CATHETER A COMMANDE DE SOUPLESSE AMELIOREE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

What is claimed is:
1. A catheter comprising:
a proximal end, a proximal region, a distal region, and an intermediate region disposed between said proximal and distal regions;
a tubular shaft having a lumen extending distally from said proximal end through at least said intermediate region; and
a stiffening member slidably disposed within said lumen from said proximal end to at least said intermediate region, such that said stiffening member can be slid longitudinally through said lumen.

2. A catheter as recited in claim 1, wherein said tubular shaft includes a proximal pressure seal disposed near said shaft proximate end and disposed about said stiffening member.

3. A balloon angioplasty catheter comprising:
a proximal end, a proximal region, a distal region, and an intermediate region disposed between said proximal and distal regions;
a tubular shaft having an inflation lumen extending distally from said proximal end through at least said intermediate region;
a balloon disposed proximate said tubular shaft distal region, said balloon having an envelope and an interior in fluid communication with said tubular shaft lumen;
a stiffening member slidably disposed within said inflation lumen from said proximal end to at least said intermediate region, such that said stiffening member can be slid longitudinally through said lumen; and
a proximal pressure seal disposed proximate said shaft proximal end and disposed about said stiffening member.

4. A catheter as recited in claim 3, wherein said tubular shaft is formed of polymeric material.

5. A catheter as recited in claim 3, further comprising a distal guide wire lumen having a proximal port proximal of said balloon and a distal port distal of said balloon.

6. A catheter as recited in claim 3, wherein said balloon has a proximal region and a distal region, further comprising a guide wire tube extending through said balloon, said guide wire tube having a proximal port proximal of said balloon proximal region and a distal port distal of said balloon distal region.

7. A catheter as recited in claim 6, wherein said stiffening member is a core wire.

8. A catheter as recited in claim 7, wherein said core wire has a distally decreasing taper.

9. A method for advancing a catheter having a lumen comprising:
providing said catheter having a first lumen and a second lumen;
providing an elongate stiffening member;
providing a guide wire;
advancing said guide wire through a vessel to a target vessel region;
advancing said stiffening member distally through said second catheter lumen;
threading said guide wire through said first lumen;
advancing said catheter distally into said vessel over said guide wire; and movement of said stiffening member proximally.

10. A method as recited in claim 9, wherein said first lumen is a distal guide wire lumen, said catheter is an angioplasty catheter, said second lumen is an inflation lumen, said retracting step includes withdrawing said stiffening member from substantially all of said inflation lumen.

11. A tubular catheter shaft comprising:
an outer tube having a lumen therethrough;
an elongate stiffening member disposed within said lumen, said stiffening member including a plurality of alternating wide and narrow segments, said segments having a cross-sectional area, wherein said wide segments having a larger cross-sectional area than said narrow segments.

12. A tubular catheter shaft as recited in claim 11, wherein said elongate stiffening member has a proximal end, a distal end, and said wide segments have an inter-segment distance therebetween and said inter-segment distance is generally distally increasing, such that said shaft flexibility is generally distally increasing.

13. A tubular catheter shaft comprising:
an outer tube having a lumen therethrough; and
an elongate stiffening member disposed within said lumen, said stiffening member including a plurality of alternating wide and narrow segments, said segments having a cross-sectional area, wherein said wide segments have a larger cross-sectional area than said narrow segments.

14. A tubular catheter shaft as recited in claim 13, wherein said wide segments have a cross-sectional profile not completely occluding said outer tube lumen, such that fluid flow through said plurality of wide segments within said outer tube is possible.

15. A tubular catheter shaft as recited in claim 14, wherein said wide segment cross-sectional profiles have at least one aperture therethrough, such that fluid flow is possible through said segment within said outer tube.

16. A tubular catheter shaft as recited in claim 15, wherein said wide segment cross-sectional profiles have at least two apertures therethrough.

17. A tubular catheter shaft comprising:
an outer tube having a lumen therethrough; and
an elongate stiffening member disposed within said lumen, said stiffening member including at least one wide segment having a cross-sectional profile, wherein said cross-sectional profile has a maximum extent in close proximity to said outer tube, wherein said cross-sectional profile does not completely occlude said outer tube lumen, such that fluid flow through said wide segment within said outer tube is possible.

18. A tubular catheter shaft as recited in claim 17, wherein said cross-sectional profile has at least one aperture therethrough, such that fluid flow is possible through said segment within said outer tube.