Visualization devices for use during percutaneous tissue dissection and associated systems and methods
A device and method for visualization of the intravascular creation of autologous valves, and particularly venous valve, is disclosed herein. One aspect of the present technology, for example, is directed toward a delivery catheter that can include a lumen configured to receive a dissection assembly and a trough having a plurality of transducers electrically coupled to a proximal portion of the delivery catheter. At least one of the transducers can be configured to emit a signal towards a portion of a blood vessel adjacent the trough, and at least one of the transducers can be configured to receive a reflection of the emitted signal.
1. A method, comprising:
intravascularly delivering a visualization catheter to a dissection site within a blood vessel, wherein the visualization catheter includes an imaging portion;
advancing a delivery catheter over the visualization catheter to the dissection site, wherein the delivery catheter includes a device lumen configured to receive a dissection assembly and an open trough, and wherein the delivery catheter is advanced to a position such that at least a portion of the open trough is longitudinally aligned with the imaging portion of the visualization catheter;
moving the visualization catheter longitudinally through a visualization lumen of the delivery catheter and through a channel of the trough;
generating images of portions of a length of the vessel with the imaging portion while moving the visualization catheter through the channel; and
positioning the imaging portion of the visualization catheter into longitudinal alignment with a distal terminus of the dissection assembly during wall dissection.
2. The method of claim 1 wherein the vessel is a vein.
3. The method of claim 1 wherein moving the visualization catheter includes moving the visualization catheter at a constant speed.
4. The method of claim 1 wherein the distal terminus of the dissection assembly comprises a beveled needle, and wherein positioning the imaging portion further comprises moving the imaging portion into longitudinal alignment with the beveled needle during wall dissection.
5. The method of claim 1 , further comprising activating an actuator coupled to the visualization catheter to automatically move the visualization catheter through the channel to desired locations during wall dissection.
6. The method of claim 1 , further comprising:
advancing a needle of the dissection assembly within a vessel wall while ejecting fluid to create a sub-mural pocket within the vessel wall; and
longitudinally aligning the imaging portion of the visualization catheter with at least the distal terminus of the needle during wall dissection.
7. The method of claim 1 wherein moving the visualization catheter longitudinally through the channel of the trough comprises moving the imaging portion of the visualization catheter in a distal direction through a visualization lumen positioned within the channel of the trough and extending the visualization catheter distally beyond a distal terminus of the trough to a position outside of the visualization lumen.
8. A method for visualization of intravascular creation of autologous valves, the method comprising:
intravascularly advancing a distal portion of a delivery catheter to a dissection site within a vessel, wherein the delivery catheter includes an open trough at the distal portion and a device lumen extending through at least a portion of the delivery catheter to an exit port at the distal portion;
advancing a visualization catheter through a visualization lumen of the delivery catheter and through a channel of the trough;
generating images of portions of a length of the vessel with the imaging portion while moving the visualization catheter through the channel;
advancing a dissection assembly through the device lumen such that a distal terminus of the dissection assembly extends beyond the exit port into a vessel wall of the vessel to create a sub-mural pocket within the vessel wall; and
moving the imaging portion of the visualization catheter and the distal terminus of the dissection assembly into longitudinal alignment with each other as the dissection assembly advances into the vessel wall during creation of the sub-mural pocket.
9. The method of claim 8 wherein advancing the visualization catheter through the visualization lumen of the delivery catheter and through the channel of the trough comprises distally advancing the imaging portion of the visualization catheter through an enclosed visualization lumen within the channel of the trough.
10. The method of claim 9 , further comprising moving the imaging portion of the visualization catheter beyond a distal terminus of the trough to a position outside of the visualization lumen.