Catheters and related devices for forming passageways between blood vessels or other anatomical structures
View Patent ↗The inventions described in this patent application include i) a torqueable introducer sheath which is useable in conjunction with a transvascular passageway forming catheter to effect precise rotational control of the catheter; ii) an anchorable guide catheter which is useable in conjunction with an intravascular imaging catheter and a transvascular passageway-forming catheter to effect precise positioning and aiming of the passageway-forming catheter; iii) a passageway forming catheter having a torqueable proximal portion to facilitate precise rotational positioning of the distal portion of the catheter; iv) a deflectable-tipped passageway forming catheter, v) various markers and other apparatus useable in conjunction with any of the passageway-forming catheters to facilitate precise positioning and aiming of the catheter, and vi) an apparatus which may be formed within a catheter to prevent a member, apparatus of flow of material from being inadvertently advanced through a lumen of the catheter.
1. A system that is useable to guide the advancement of a guidewire from a location within the lumen of a blood vessel to a target location within or outside of the wall of that blood vessel, said system comprising:
an elongate flexible catheter body that is advanceable through the vasculature into said blood vessel lumen, said catheter body having a side wall and at least one lumen extending longitudinally therethrough;
an opening formed in the side wall of said catheter body;
a single tissue penetrating element having a lumen, a tissue penetrating distal tip and a distal end opening, said tissue penetrating element being alternately disposable in;
a) a first position wherein the tissue penetrating element is substantially within the catheter body; and
b) a second position wherein the tissue penetrating element assumes a predetermined curved configuration and extends out of the opening formed in the side wall of said catheter body so as to penetrate a wall of the blood vessel adjacent to the blood vessel lumen in which the catheter is positioned; and
a guidewire that is advanceable through the lumen of the tissue penetrating element while the tissue penetrating element is in the second position;
an imaging apparatus on or in the catheter body and useable to image the target location; and
an image display apparatus adapted to display an image received from the imaging apparatus in combination with an indication of the trajectory on which the tissue penetrating element is expected to subsequently advance while the tissue penetrating element is still in the first position, thereby facilitating adjustment of the rotational orientation of the catheter body within the blood vessel while the penetrating element is in the first position so that subsequent advancement of the tissue penetrating element to the second position will cause the tissue penetrating element to advance in the direction of the target location.
2. A system according to claim 1 further comprising an anchoring member, said anchoring member being deployable when the catheter body is inserted into an anatomical lumen such that a surface of the anchoring member will engage a wall of the anatomical lumen thereby preventing at least a portion of the catheter body from undergoing substantial movement within the anatomical lumen.
3. A system according to claim 2 wherein the anchoring member comprises a balloon.
4. A system according to claim 2 further comprising a friction enhancing treatment upon a surface of the anchoring member.
5. A system according to claim 4 wherein said friction enhancing treatment is selected from the group of friction enhancing treatments consisting of:
texturing;
adhesive; and,
woven fabric.
6. A system according to claim 1 wherein the imaging apparatus comprises an intravascular ultrasound imaging apparatus.
7. A system according to claim 1 wherein the catheter body has a lumen into which the imaging apparatus is inserted.