Systems and methods for endoluminal valve creation
Medical systems, devices and methods for creation of autologous tissue valves within a mammalian body are disclosed. One example of a device for creating a valve flap from a vessel wall includes an elongate tubular structure having a proximal portion and a distal portion and a longitudinal axis; a first lumen having a first exit port located on the distal portion of the elongate tubular structure; a second lumen having a second exit port located on the distal portion of the elongate tubular structure; a recessed distal surface on the distal portion of the elongate tubular structure, wherein the recessed distal surface is located distally to the first exit port; and an open trough on the recessed distal surface extending longitudinally from the first exit port.
1 . A system for delivering fluid to a space within a blood vessel wall, the system comprising:
a catheter device, comprising:
a distal portion configured to be intravascularly positioned adjacent to the blood vessel wall, wherein the distal portion includes an open trough extending distally in a longitudinal direction at the distal portion and a tissue engagement surface extending along a longitudinal segment of the open trough;
a tool lumen extending through the catheter device and terminating at a first port proximal to the open trough; and
a visualization lumen extending through the catheter device and into the distal portion, wherein the visualization lumen extends to a second port proximal to the open trough and positioned to direct the visualization device into the open trough, wherein the visualization lumen and the open trough are configured to allow a visualization device to visualize tissue in the blood vessel wall adjacent to the tissue engagement surface, and wherein the open trough is configured to guide the visualization device in a longitudinal direction; and
a tool configured to advance through the tool lumen and out of the first port to access the space in the blood vessel wall, wherein the tool includes a lumen to deliver fluid to the space within the blood vessel wall.
2 . The system of claim 1 wherein the tissue engagement surface is configured to press against an opposing portion of the blood vessel wall and define at least a portion of a periphery of the space within the blood vessel wall.
3 . The system of claim 1 wherein the open trough comprises a bottom portion and sidewalls that extend from the bottom portion to the tissue engagement surface, and wherein at least a portion of the bottom portion is covered by a transparent viewing window for the visualization device to visualize the tissue in the blood vessel wall.
4 . The system of claim 1 wherein at least a portion of the first port is at an elevation corresponding to an elevation of the tissue engagement surface.
5 . The system of claim 1 wherein the tool is a puncture element configured to advance through the first port and puncture the blood vessel wall to access the space within the blood vessel wall.
6 . The system of claim 1 wherein a top-most edge of the visualization lumen at the distal portion is at an elevation that is aligned with or below the tissue engagement surface.
7 . A system for visualizing a delivery of fluid to a space within a blood vessel wall, the system comprising:
an elongated shaft, comprising:
a distal portion configured to be intravascularly positioned adjacent to the blood vessel wall, wherein the distal portion has a sloped surface, a tissue engagement surface extending distally in a longitudinal direction from the sloped surface, and a trough extending distally from the sloped surface in the longitudinal direction, wherein the trough comprises a bottom portion and sidewalls extending between the bottom portion to the tissue engagement surface so that the bottom portion is open to the blood vessel wall;
a tool lumen extending through the elongated shaft and terminating at an exit port proximal to the tissue engagement surface; and
a visualization lumen extending through the elongated shaft and into the distal portion, wherein the visualization lumen is configured to guide a visualization device to the distal portion to visualize tissue in the blood vessel wall adjacent to the tissue engagement surface, and wherein the visualization lumen and the trough are configured to guide the visualization device to visualize tissue in the blood vessel wall adjacent to the tissue engagement surface; and
a fluid delivery tool configured to advance through the tool lumen and distally from the exit port to access the space in the blood vessel wall, wherein the fluid delivery tool includes a fluid lumen to deliver the fluid to the space within the blood vessel wall.
8 . The system of claim 7 wherein the tissue engagement surface comprises a transparent material providing a window between the visualization lumen and the blood vessel wall adjacent to the tissue engagement surface.
9 . The system of claim 7 wherein the distal portion of the elongated shaft further comprises an expandable member positioned circumferentially opposite the tissue engagement surface, and wherein the expandable member is positioned to press the sloped surface and the tissue engagement surface into contact with the blood vessel wall.
10 . The system of claim 9 wherein expansion of the expandable member is configured to cause the tissue engagement surface to contact a first segment of the blood vessel wall such that the first segment of the blood vessel wall is at a different elevation with respect to a second segment of the blood vessel wall in contact with the sloped surface.
11 . The system of claim 9 wherein expansion of the expandable member is configured to cause the tissue engagement surface to contact a first segment of the blood vessel wall and position the exit port to direct the fluid delivery tool into the first segment of the blood vessel wall to access the space within the blood vessel wall.
12 . The system of claim 7 wherein the fluid delivery tool is configured to eject the fluid as the fluid delivery tool advances out of the exit port and into the space within the blood vessel wall.
13 . A device for delivering a fluid to a space within a blood vessel wall, the device comprising:
a catheter shaft having a distal portion configured to be intravascularly positioned adjacent to the space within the blood vessel wall, wherein the distal portion comprises:
a sloped surface at an angle with respect to a longitudinal axis of the distal portion;
a tissue engagement surface extending distally from the sloped surface along the longitudinal axis of the distal portion;
a trough formed in the tissue engagement surface, wherein the trough is open to the blood vessel wall and positioned to define at least a portion of a periphery of the space when the distal portion is pressed against the blood vessel wall; and
a first port positioned along at least a portion of the sloped surface;
a first lumen extending through the catheter shaft and terminating at the first port of the distal portion, wherein the first lumen and the first port are positioned to direct a fluid delivery tool into the space when the distal portion is pressed against the blood vessel wall; and
a second lumen extending through the catheter shaft and terminating at a second port open to the trough, wherein the second lumen is positioned to direct an imaging device adjacent to the space when the distal portion is pressed against the blood vessel wall to image the space within the blood vessel wall, and wherein the trough is configured to guide the imaging device while imaging the space within the blood vessel wall.
14 . The device of claim 13 , further comprising an expandable component carried by the distal portion of the catheter shaft, wherein the expandable component is positioned circumferentially opposite the sloped surface and the tissue engagement surface to press the sloped surface and the tissue engagement surface into contact with the blood vessel wall.
15 . The device of claim 13 wherein the first port is positioned to direct the fluid delivery tool distally at an elevation above the tissue engagement surface to access the space within the blood vessel wall.
16 . The device of claim 13 wherein the fluid delivery tool is a puncture element configured to move distally out of the first port and penetrate the blood vessel wall to access and create the space within the blood vessel wall.