Rapid exchange catheters usable with embolic protection devices
Catheters, assemblies, and methods for delivering and recovering embolic protection devices. Catheters are provided that can be advanced over single length guide wires and which can be retracted over single length wire shafts of distal embolic protection devices. One catheter is a two-port catheter having two sidewall ports, a distal end port, and a proximal end port. The two-port catheter can be advanced over a guide wire threaded between the distal end port and the distal sidewall port. An embolic protection device wire shaft can be back loaded into the distal end port and out the proximal sidewall port. A three-port catheter includes a distal end port, and distal, intermediate, and proximal sidewall ports. The distal sidewall port can be dimensioned to accept passage of a filter body through the port. The distal end port can be dimensioned to accept only a guide wire to provide a smooth transition from the guide wire to the small profile distal end. The guide wire can extend between the distal end port and the intermediate port while the filter body shaft can extend through the proximal port, to be distally urged through the distal sidewall port. Another catheter embodiment is a slotted catheter, including a biased, normally open slot over most of its length. The slot can be sufficiently small to resist unwanted transverse movement of a wire through the slot. The slotted catheter can be retracted over a wire by forcing the wire through the resilient slot.
1. A sheath for deployment of a medical device having a first outer diameter in a first, closed state and a second outer diameter in a second, expanded state, comprising:
an elongate tubular member having a proximal end, a distal end, and a lumen therebetween, the elongate tubular member having a first opening from the lumen at the distal end, a second opening from the lumen proximal to the distal end, and a third opening from the lumen distal of the proximal end of the tubular member, the openings defining points at which the lumen opens to an environment surrounding the sheath, the second opening being positioned within the elongate tubular member at a location that is spaced 180° from a location of the third opening within the elongate tubular member;
a guidewire that passes through the first opening, through the lumen of the elongate tubular member, and through the second opening; and
a support wire that passes through the third opening and extends through the lumen from proximal the second opening toward the distal end, the support wire adapted to receive an endoluminal medical device.
2. The sheath of claim 1 , wherein the sheath is a rapid exchange sheath.
3. The sheath of claim 1 , wherein the second opening is a short distance proximal to the distal end.
4. The sheath of claim 1 , wherein the support wire further comprises an expandable filter mounted on a distal end of the support wire.
5. The sheath of claim 4 , wherein the support wire and filter are positioned within the lumen of the elongate tubular member.
6. The sheath of claim 1 , wherein the third opening is a short distance proximal from the distal end.
7. The sheath of claim 1 , wherein the first opening has a diameter at least as great as the first outer diameter of the medical device.