System and method for re-entering a vessel lumen
View Patent ↗This disclosure is directed to systems and methods for re-entering the true lumen of a vessel. The re-entry catheters employ deflectable struts to stabilize and support the distal tip in a subintimal location while a passageway back into the true lumen is formed. Re-entry to the true lumen can be effected with a cutting element or with a conventional guidewire.
1. A re-entry catheter for facilitating formation of a passageway from a subintimal area to a lumen of a vessel, comprising an elongated outer tubular member configured to be disposed in the subintimal area between an intimal layer and an adventitial layer, the elongated outer tubular member having a distal end and a window adjacent the distal end, a plurality of deflectable struts arranged longitudinally within the window, a lateral port in the outer tubular member in a location opposing the window, and an actuating member coaxially disposed within the elongated outer tubular member and configured for axial motion relative to the elongated outer tubular member, a cutting member comprising a cannula coaxially disposed within the actuating member, wherein proximal ends of the plurality of deflectable struts are operatively connected to a distal end of the actuating member, such that axial motion of the actuating member deflects the plurality of deflectable struts radially outward so that the lateral port is held against the intimal layer as the cannula advances out of the lateral port and into a lesion disposed in the lumen of the vessel.
2. The re-entry catheter of claim 1 , wherein the struts are formed from a nickel-titanium alloy.
3. The re-entry catheter of claim 1 , wherein the outer tubular member has a circumference and wherein the window occupies a portion of the circumference corresponding to a range of approximately 120° to 240°.
4. The re-entry catheter of claim 1 , wherein tension applied to the actuating member increases stiffness at the distal end of the elongated tubular member.
5. The re-entry catheter of claim 1 , further comprising a membrane supported by the struts and configured to distribute force between the plurality of deflectable struts.
6. The re-entry catheter of claim 1 , wherein the cannula is formed from nickel-titanium alloy.
7. The re-entry catheter of claim 1 , wherein the actuating member is operatively connected to a mechanical handle configured to move the actuating member distally in an axial direction by incremental amounts.
8. The re-entry catheter of claim 1 , wherein the catheter has a diameter in the range of approximately 6 French and smaller.
9. The re-entry catheter of claim 1 , wherein the cutting member is slidably disposed within the actuating member.
10. The re-entry catheter of claim 1 , wherein the actuating member comprises a hypotube coaxially disposed within the outer tubular member.
11. The re-entry catheter of claim 1 , wherein the lateral port is located diametrically opposed to the window.