Balloon catheter with non-deployable stent
View Patent ↗An angioplasty balloon including a non-deployable stent to prevent or reduce the potential for slippage of the inflated balloon with respect to the vessel wall being treated. The balloon includes a non-deployable stent that is adapted to be secured to the balloon or angioplasty balloon catheter. The stent has a proximal end, a distal end, and at least one extension section, at least one set of serpentine rings and at least one set of elongation links that allow expansion of the strut to accommodate the inflation of the balloon. The stent is made of a material so that the stent collapses upon deflation of the balloon.
1. A method for performing angioplasty in a blood vessel, said method comprising:
introducing a balloon catheter into a blood vessel, said catheter having a shaft and an inflatable balloon;
inflating the balloon to radially expand a non-deployable stent, wherein a central portion of the stent shortens in length as the stent is radially expanded, wherein the non-deployable stent includes (1) ends which are sandwiched between a sleeve and the shaft of the balloon catheter and (2) a region which expands longitudinally to compensate for foreshortening of the length which results from radial expansion; and
deflating the balloon to allow the non-deployable stent to collapse over the balloon as it deflates.
2. A method as in claim 1 , wherein the non-deployable stent comprises two ends attached to the shaft of the balloon catheter, one end being attached on each side of the balloon.
3. A method as in claim 2 , wherein said region that expands includes at least one extension section between the end and the central section.
4. A method as in claim 3 , wherein said region that expands includes a second extension section between the other end and the central section.
5. A method as in claim 2 , wherein the non-deployable stent includes one or more elongation links along a length of the central section.
6. A method as in claim 1 , wherein the central section of the non-deployable stent comprises a plurality of serpentine rings.
7. An angioplasty catheter comprising:
a catheter shaft having a distal end and proximal end;
an inflatable balloon disposed near the distal end of the catheter shaft;
a non-deployable stent disposed over the inflatable balloon, said stent including a central section which radially expands and axially foreshortens when the balloon is inflated, an end, and an extension section between the end and the central section;
wherein the end of the stent is sandwiched between a sleeve and the shaft on at least one side of the balloon and wherein the extension section of the stent longitudinally expands to accommodate axial shortening of the central section of the stent upon radial expansion of the stent resulting from balloon expansion.
8. An angioplasty catheter as in claim 7 , wherein the stent includes a second end which is sandwiched between a sleeve and the catheter shaft on another side of the balloon.
9. An angioplasty catheter as in claim 8 , the stent further comprises a second extension section between the second end and the central section of the stent.
10. An angioplasty catheter as in claim 9 , wherein the central section comprises a plurality of axially joined serpentine rings.
11. An angioplasty catheter as in claim 8 , further comprising at least one elongation link between adjacent serpentine rings in the central section of the stent.
12. An angioplasty catheter as in claim 11 , including a plurality of elongation links between adjacent serpentine rings in the central section of the stent.