Recanalizing occluded vessels using controlled antegrade and retrograde tracking
A method and systems for treating chronic total occlusions, particularly those that are difficult to treat, is disclosed. In this approach, recanalizing the CTO is achieved using a combined antegrade and retrograde approach. The proximal end of the occlusion is penetrated using an antegrade wire, using a traditional approach. Using collateral vessels, the distal end of the occlusion is crossed in a retrograde fashion and by appropriately maneuvering each member, a continuous channel is created. Additional elements such as capture devices, dilators and injection catheters are also disclosed.
1. A capture device comprising: a tubular member comprising a catheter shaft having a guidewire lumen located therein, the tubular member being configured to be advanced in a body channel and extending between a proximal end and a distal end, the tubular member comprising an expandable capture mechanism comprising one or more tension wires coupled directly to a stop coupled to the distal end of the catheter shaft and the one or more tension wires coupled directly to a distal end of the guidewire lumen, wherein the one or more tension wires of the expandable capture mechanism are configured to be movable between an expanded and a collapsed state and are configured to receive a guidewire when in the expanded state and capture the guidewire by moving from the expanded state to the collapsed state.
2. The capture device of claim 1 , wherein the expandable capture mechanism is rotatable.
3. The capture device of claim 1 , wherein the guidewire lumen extends beyond the distal end of the catheter shaft.
4. The capture device of claim 3 , wherein the guidewire lumen also extends beyond the expandable capture mechanism.
5. The capture device of claim 1 further comprising a capture lumen located within the catheter shaft.
6. The capture device of claim 5 , wherein the guidewire lumen and the capture lumen are co-axial.
7. The capture device of claim 1 , wherein the one or more tension wires are twistable wires configured to expand in one direction and collapse in an opposite direction.
8. The capture device of claim 7 , wherein the one or more tension wires expand and collapse via twisting.
9. The capture device of claim 7 further comprising a restraining sleeve for maintaining the one or more tension wires in the collapsed state, wherein the one or more tension wires expand when removed from the restraining sleeve.
10. The capture device of claim 1 , wherein the one or more tension wires are at least partially covered in a non-porous or semi-porous material.
11. The capture device of claim 1 , wherein the one or more tension wires form a mesh-like structure.
12. The capture device of claim 1 , wherein the expandable capture mechanism is configured to receive a thrombus.