Methods for exchanging devices
A method for replacing a first sheath, whose distal end is positioned inside a vessel and whose proximal end is positioned outside the skin of a patient, with a second sheath may involve inserting a dilator over a guidewire and into the first sheath until a distal end of the dilator and a distal end of the guidewire are positioned inside the vessel. The dilator may be hubless or include a removable hub. The method may further involve removing the first sheath, thereby leaving only the dilator and the guidewire in place. After removing the first sheath, a second sheath may be passed over the dilator and the guidewire until the distal end of the second sheath is positioned inside the vessel. The method may further involve removing the dilator and the guidewire, leaving only the second sheath in place.
1. A method, comprising:
inserting a first sheath into a vessel until a distal end of the first sheath is positioned inside the vessel;
inserting a transcatheter heart valve into the vessel via the first sheath;
inserting a dilator over a guidewire and into the first sheath until a distal end of the dilator and a distal end of the guidewire are positioned inside the vessel;
removing the first sheath, thereby leaving only the dilator and the guidewire in place;
passing a second sheath over the dilator and the guidewire until a distal end of the second sheath is positioned inside the vessel; and
removing the dilator and the guidewire, thereby leaving only the second sheath in place.
2. The method of claim 1 , further comprising inhibiting patient blood loss through a puncture hole in a wall of the vessel using the combination of the dilator and the guidewire to substantially fill the puncture hole.
3. The method of claim 1 , wherein the dilator is hubless and defines a lumen configured to receive the guidewire.
4. The method of claim 1 , wherein the dilator comprises a middle portion having an approximately constant diameter, and wherein a portion of the distal end of the dilator and a proximal end of the dilator are tapered.
5. The method of claim 4 , wherein the tapered portion of the distal end of the dilator comprises a radiopaque band.
6. The method of claim 4 , wherein one or more portions of the dilator include a radiopaque element.
7. The method of claim 4 , wherein the diameter of the middle portion of the dilator is approximately the same size as a puncture hole in a wall of the vessel.
8. The method of claim 1 , wherein the dilator is about 30 cm to about 70 cm long, inclusive.
9. The method of claim 1 , wherein the dilator comprises an approximately, uniform stiffness profile along a length of the dilator.
10. The method of claim 1 , wherein the first sheath is a procedural introducer sheath configured to channel at least one interventional device to the vessel.
11. The method of claim 1 , wherein the second sheath is a sealing introducer sheath configured to channel an implant assembly to the vessel, the implant assembly configured to seal a puncture hole created in a wall of the vessel.
12. The method of claim 1 , wherein the guidewire defines a lumen and a length that is greater than a length of the dilator.
13. The method of claim 12 , wherein the length of the guidewire is about 30 cm to about 80 cm, inclusive.
14. The method of claim 1 , wherein the distal end of the guidewire extends at least about 10 cm within a lumen of the vessel after placement therein.
15. The method of claim 1 , wherein an external diameter of the guidewire is about 0.01 inches to about 0.04 inches, inclusive.
16. The method of claim 1 , wherein the vessel comprises a portion of the femoral artery.
17. The method of claim 1 , wherein the vessel comprises a portion of the radial artery.
18. The method of claim 1 , wherein a distance between an outer surface of a wall of the vessel and the skin of the patient is about 1 cm to about 10 cm.