Luminal structure anchoring devices and methods
The present invention relates to a device for endoscopy or endosonography-guided transluminal interventions whereby two luminal structures in the body may be drawn toward each other and a fluid conduit formed in between. The device may have a hollow central member to which is coupled a distal retention member and in one embodiment a proximal retention member. The retention members may each be positioned inside one of the luminal structures and expanded from a first condition to an expanded second condition having an increased radius. The length of the central member may be shortened and its diameter expanded to approximate the two retention members and thereby the luminal structures.
1. A medical device to form a fluid pathway between adjacent tissue layers of a first luminal body and a second body, comprising:
a central member, forming a lumen to define the fluid pathway, and defining a longitudinal axis, the central member having a middle portion, distal and proximal end portions, a length, a diameter, and a plane transverse to the longitudinal axis at each of a distal end and proximal end of the middle portion;
the distal end portion including a distal retention member and the proximal end portion including a proximal retention member, the distal and proximal retention members configured to move from a first configuration to a second configuration; and
whereby, in the second configuration, the distal and proximal retention members are separated by a distance along the longitudinal axis of the middle portion and at least a portion of each of the distal and proximal end portions extend over different segments of the middle portion beyond the transverse plane at the respective distal and proximal ends of the middle portion, a length of the middle portion decreases and a diameter of the middle portion increases, thereby presenting an anchor interface to appose the adjacent tissue layers of the first luminal body and second body.
2. The device of claim 1 , wherein the adjacent tissue layers of the first luminal body and second body are selected from the group consisting of esophagus, stomach, small intestine, colon, bladder, gallbladder, uterus, bronchotracheal tree, bile duct, pancreatic duct, urethra, ureter, arteries, veins and other neighboring tissue structures.
3. The device of claim 2 , wherein the adjacent tissue layer of the first luminal body is the stomach and the adjacent tissue layer of the second body is a neighboring tissue structure to the stomach.
4. The device of claim 1 wherein the central member comprises a woven filament braid.
5. The device of claim 4 , wherein the woven filament braid comprises multiple filaments or a single filament.
6. The device of claim 1 , further comprising an elastomeric material covering at least the middle portion of the central member.
7. The device of claim 6 , wherein the elastomeric material covers the distal and proximal end portions.
8. A system to form a fluid pathway between adjacent tissue layers of a first luminal body and a second body, comprising:
a penetrating member;
a stent having a central member forming a lumen and having a middle portion, distal and proximal end portions, a length, and a diameter, the central member defining a longitudinal axis;
the distal and proximal end portions configured to transition from a first configuration to a second configuration to form respective distal and proximal retention members; and
whereby, in the second configuration, the distal and proximal retention members are separated by a distance along the longitudinal axis of the middle portion, a length of the middle portion decreases and a diameter of the middle portion increases, and at least a portion of the distal retention member extends proximally along the longitudinal axis and at least a portion of the proximal retention member extends distally along the longitudinal axis, over different segments of the middle portion.
9. The system of claim 8 , wherein the proximally and distally extending portions present respective anchor interfaces to appose the adjacent tissue layers of the first luminal body and second body.
10. The system of claim 8 , wherein the adjacent tissue layer of the first luminal body is the stomach and the adjacent tissue layer of the second body is a neighboring tissue structure to the stomach.
11. The system of claim 8 , wherein the penetrating member comprises a needle.
12. A drainage device to form a fluid pathway between adjacent tissue layers of a first luminal body and a second body, comprising:
a central member forming a lumen and having a middle portion, distal and proximal end portions, a length and a diameter, the central member defining a longitudinal axis;
the distal end portion configured to move from a first configuration to a second configuration to form a distal retention member;
the proximal end portion configured to move from a first configuration to a second configuration to form a proximal retention member;
and
whereby, in the second configuration, a length of the middle portion decreases and a diameter of the middle portion increases, at least a portion of the distal retention member bends back over a first segment of the middle portion along the longitudinal axis of the central member, and at least a portion of the proximal retention member bends back over a second segment of the middle portion along the longitudinal axis of the central member,
wherein the distal and proximal retention members are separated by a distance along the longitudinal axis such that the first segment of the middle portion is different than the second segment of the middle portion.
13. The device of claim 12 , wherein the bent portion of the distal and proximal retention members presents an anchor interface to appose the adjacent tissue layers of the first luminal body and second body.
14. The device of claim 13 , wherein the bent portions of the distal and proximal retention members form curves that reduce trauma to the adjacent tissue layers.
15. The device of claim 12 , wherein the adjacent tissue layers of the first luminal body and second body are selected from the group consisting of esophagus, stomach, small intestine, colon, bladder, gallbladder, uterus, bronchotracheal tree, bile duct, pancreatic duct, urethra, ureter, arteries, veins and other neighboring tissue structures.
16. The device of claim 12 , wherein the adjacent tissue layer of the first luminal body is the stomach.
17. The device of claim 16 , wherein the adjacent tissue layer of the second body is a neighboring tissue structure to the stomach.