Guided filter with support wire and methods of use
View Patent ↗A guided filter system for temporary placement of a filter in an artery or vein is disclosed. The system includes a guidewire slideable through a wire guide included in a distal region of a support wire. The support wire has an expandable filter, which is operable between a collapsed or enlarged condition. A variety of endovascular devices, including angioplasty, atherectomy, and stent-deployment catheters, are insertable over the guidewire and/or the support wire. Methods of using the guided filter system to direct and exchange endovascular devices to a region of interest, and to entrap and remove embolic material from the vessel are also disclosed.
1. A percutaneous filter system comprising:
a guidewire;
a first sheath comprising a lumen adapted to receive the guidewire;
a filter wire having a distal region;
an expandable filter positioned on the distal region of the filter wire; and
a second sheath having a distal region, a proximal region and a lumen extending therebetween, the lumen adapted to receive the filter wire and the expandable filter;
wherein the first sheath is positioned proximate the distal region of the second sheath.
2. The percutaneous filter system of claim 1 , wherein the second sheath comprises a catheter.
3. The percutaneous filter system of claim 2 , wherein the catheter comprises an exterior surface, and the first sheath is secured to the exterior surface of the catheter.
4. The percutaneous filter system of claim 1 , further comprising an elongate member having a proximal region and a distal region.
5. The percutaneous filter system of claim 4 , wherein the first sheath comprises a tubular segment and is secured to the distal region of the elongate member.
6. The percutaneous filter system of claim 4 , wherein the second sheath comprises a tubular segment and is secured to the distal region of the elongate member.
7. The percutaneous filter system of claim 1 , further comprising a percutaneous medical instrument, wherein the filter wire is adapted to receive the percutaneous medical instrument.
8. The percutaneous filter system of claim 7 , wherein the percutaneous medical instrument comprises a percutaneous medical instrument selected from the group consisting of an angioplasty catheter, a stern-deployment catheter, an atherectomy catheter, an intravascular ultrasound catheter, and an aspiration catheter.
9. A method of deploying a percutaneous medical instrument, comprising steps of:
providing a percutaneous filter apparatus comprising a guidewire, a first sheath adapted to receive the guidewire, a filter wire having a distal region and an expandable filter positioned on the distal region of the support wire, a second sheath adapted to receive the support wire and the expandable filter, the second sheath having a distal region, the first sheath being secured to the distal region of the second sheath;
providing a percutaneous medical instrument;
advancing the guidewire into a region of interest;
advancing the filter apparatus along the guidewire, the first sheath engaging the guidewire, the support wire positioned within the second sheath;
withdrawing the second sheath;
deploying the filter downstream of the region of interest; and
advancing the percutaneous medical instrument along either the guidewire or the filter wire.
10. The method of claim 9 , wherein the percutaneous medical instrument is advanced over the filter wire subsequent to withdrawing the guidewire.
11. The method of claim 9 , wherein the percutaneous medical instrument is advanced over the guidewire.
12. The method of claim 9 , wherein providing a percutaneous filter apparatus includes providing a first sheath comprising a tubular segment and a second sheath comprising a catheter having a distal region, where the first sheath is secured to the distal region of the second sheath.
13. The method of claim 9 , wherein providing a percutaneous filter apparatus includes providing an elongate member, a first sheath comprising a tubular segment and a second sheath comprising a tubular member, where the first sheath and the second sheath are secured to the elongate member.
14. The method of claim 9 , wherein the percutaneous medical instrument comprises a percutaneous medical instrument selected from the group consisting of an angioplasty catheter, a stent-deployment catheter, an atherectomy catheter, an intravascular ultrasound catheter, and an aspiration catheter.