Stent delivery catheter assembly and method of use
First Claim
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1. A method for entrapping plaque particles against a vascular wall at a predetermined intravascular site, comprising the steps of:
- providing a radially outwardly deformable, tubular sheath having a proximal end and a distal end;
providing an intravascular deployment catheter having a proximal end, a distal end, and a lumen extending therebetween;
attaching the sheath proximal end to the deployment catheter distal end;
providing a radially outwardly deformable stent;
disposing the stent within the sheath;
introducing the deployment catheter into the vasculature;
advancing the deployment catheter through the vasculature to position the sheath at the intravascular site; and
expanding the sheath against the vascular wall at the intravascular site to trap the plaque therebetween;
wherein the step of expanding the sheath comprises expanding the stent along with the sheath, the sheath contacting the vascular wall and the stent contacting the sheath.
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Abstract
A deformable sheath is attached to a catheter and introduced intravascularly to be expanded against an arterial wall and entrap plaque therebetween. A stent is subsequently deployed within the expanded sheath and the sheath is then withdrawn from within the vasculature to leave the stent expanded against the arterial wall with the plaque entrapped therebetween.
141 Citations
26 Claims
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1. A method for entrapping plaque particles against a vascular wall at a predetermined intravascular site, comprising the steps of:
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providing a radially outwardly deformable, tubular sheath having a proximal end and a distal end;
providing an intravascular deployment catheter having a proximal end, a distal end, and a lumen extending therebetween;
attaching the sheath proximal end to the deployment catheter distal end;
providing a radially outwardly deformable stent;
disposing the stent within the sheath;
introducing the deployment catheter into the vasculature;
advancing the deployment catheter through the vasculature to position the sheath at the intravascular site; and
expanding the sheath against the vascular wall at the intravascular site to trap the plaque therebetween;
wherein the step of expanding the sheath comprises expanding the stent along with the sheath, the sheath contacting the vascular wall and the stent contacting the sheath.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for entrapping plaque particles against a vascular wall at a predetermined intravascular site, comprising the steps of:
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providing a radially outwardly deformable, tubular sheath having a proximal end and a distal end;
providing an intravascular deployment catheter having a proximal end, a distal end, and a lumen extending therebetween;
attaching the sheath proximal end to the deployment catheter distal end;
introducing the deployment catheter into the vasculature;
advancing the deployment catheter through the vasculature to position the sheath at the intravascular site;
expanding the sheath against the vascular wall at the intravascular site to trap the plaque therebetween;
providing a delivery catheter having a proximal end and a distal end and a lumen extending therebetween;
providing a self-expanding intravascular device having a proximal end and a distal end and further having a compressed state and an expanded state;
placing the intravascular device in its compressed state within the delivery catheter distal end;
introducing the delivery catheter into the lumen of the deployment catheter;
advancing the delivery catheter through the lumen of the deployment catheter to position the distal end of the delivery catheter adjacent the distal end of the sheath;
partially retracting the delivery catheter to allow the distal end of the intravascular device to expand against the vessel wall at a location distal of the plaque at the intravascular site;
withdrawing the sheath proximally from the intravascular site to expose the distal end of the delivery catheter;
retracting the delivery catheter to allow the entire intravascular device to expand against the vessel wall at the intravascular site and trap the plaque therebetween;
withdrawing the delivery catheter from within the intravascular catheter; and
withdrawing the intravascular catheter and the sheath from within the vasculature.- View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
the step of providing a delivery catheter further comprises providing a pusher rod disposed within the delivery catheter lumen to contact the proximal end of the intravascular device; and
the steps of advancing the intravascular device out of the delivery catheter comprise withdrawing the delivery catheter proximally along the pusher rod to expose the intravascular device and thereby allow it to assume its expanded state.
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18. The method of claim 16, wherein the intravascular device is a stent.
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19. The method of claim 18, wherein the stent is formed with a plurality of apertures, each aperture being no larger than 200 microns across when the stern is in the expanded state.
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20. The method of claim 16, wherein the intravascular device is a wire mesh.
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21. The method of claim 20, wherein the wire mesh is formed with a plurality apertures, each aperture being no larger than 200 microns across when the wire mesh is in the expanded state.
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22. The method of claim 16, wherein:
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the step of expanding the sheath against the vascular wall comprises partially expanding the sheath; and
comprising, after the step of withdrawing the delivery catheter, the further steps of;
providing a balloon catheter;
inserting the balloon catheter into the lumen of the deployment catheter;
advancing the balloon catheter to position the balloon within the intravascular device;
inflating the stent to further expand the intravascular device against the vessel wall and entrap the plaque therebetween; and
withdrawing the balloon catheter from the deployment catheter lumen.
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23. The method of claim 16, wherein the step of providing a delivery catheter comprises providing a delivery catheter with perforations formed near the distal end of the delivery catheter to allow fluid communication between the outside of the delivery catheter and the delivery catheter lumen.
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24. A method for entrapping plaque particles against a vascular wall at a predetermined intravascular site, comprising the steps of:
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providing a radially outwardly deformable, tubular sheath having a proximal end and a distal end;
providing an intravascular deployment catheter having a proximal end, a distal end, and a lumen extending therebetween;
attaching the sheath proximal end to the deployment catheter distal end;
providing a radially outwardly deformable, tubular member;
disposing the deformable member within the sheath so that the deformable member is embedded into the wall of the sheath;
introducing the deployment catheter into the vasculature;
advancing the deployment catheter through the vasculature to position the sheath at the intravascular site; and
expanding the sheath against the vascular wall at the intravascular site to trap the plaque therebetween;
wherein the step of expanding the sheath comprises expanding the deformable member along with the sheath, the sheath contacting the vascular wall.- View Dependent Claims (25, 26)
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Specification