Tissue anchor for securing tissue layers
Tissue anchors comprise a woven filament braid body having an elongated tubular configuration and a foreshortened configuration where proximal and distal ends of the body expand radially into double-walled flange structures while leaving a cylindrical saddle region therebetween. The tissue anchors are deployed through penetrations between adjacent tissue layers, where the flanges engage the outer surfaces of the tissue layers and the saddle region resides within the tissue penetrations.
1. A medical device for placement across aligned penetrations in adjacent tissue of a first luminal region of a body and a second region of the body to form a flow path therebetween, comprising:
an anchor comprising a woven filament braid with a central lumen having a first length in a radially constrained configuration, the anchor transitionable between the radially constrained configuration and a preformed configuration,
the preformed configuration comprising a middle segment of the central lumen having a second length and a proximal end and a distal end of the central lumen flaring radially outward to form only one proximal flange structure along the proximal end and only one distal flange structure along the distal end,
wherein the middle segment includes a substantially constant diameter which extends substantially an entire length between the proximal and distal flange structures,
wherein the proximal flange structure includes a single tissue apposing surface adjacent to the middle segment and the distal flange structure includes a single tissue apposing surface adjacent to the middle segment to appose the adjacent tissue of the first luminal region and the second region along the middle segment,
wherein, in the preformed configuration, the second length of the middle segment is at least 40% shorter than the first length of the central lumen in the radially constrained configuration, and
wherein each of the proximal and distal flange structures has a diameter greater than twice a diameter of the middle segment and greater than the second length of the middle segment.
2. The device of claim 1 , further comprising an elastomeric material covering at least the middle segment of the central lumen.
3. The device of claim 2 , wherein the elastomeric material covers the proximal and distal flange structures.
4. The device of claim 2 , where the elastomeric material is silicone.
5. The device of claim 3 , wherein the elastomeric material conforms to the anchor in the radially constrained configuration and the preformed configuration.
6. The device of claim 1 , wherein the first luminal region of the body and the second region of the body comprise adjacent tissue of the esophagus, stomach, duodenum, small intestine, bile duct, pancreatic duct, gallbladder, pancreas, pseudocyst, liver, or diaphragm.
7. A medical device configured for positioning through penetrations in adjacent tissue layers and forming a flow path therebetween, comprising:
a body formed of a woven filament braid,
the body having an elongated tubular configuration and a foreshortened configuration,
wherein proximal and distal ends of the body expand radially in the foreshortened configuration into only one proximal flared flange structure along the proximal end and only one distal flared flange structure along the distal end, leaving a length of a cylindrical saddle region therebetween,
wherein the cylindrical saddle region includes a substantially constant diameter and extends an entire length between the proximal and distal flared flange structures,
wherein the body defines an open passage along a central axis in the elongated tubular configuration and the foreshortened configuration; and
a membrane over at least a portion of the body,
wherein, in the foreshortened configuration, the length of the body is at least 40% shorter than the length of the body in the elongated tubular configuration, and
wherein the proximal and distal flared flange structures have a diameter greater than twice a diameter of the cylindrical saddle region and greater than the length of the cylindrical saddle region.
8. The device of claim 7 , where the woven filament braid comprises multiple filaments or a single filament.
9. The device of claim 7 , wherein the adjacent tissue layers are the esophagus, stomach, duodenum, small intestine, bile duct, pancreatic duct, gallbladder, pancreas, pseudocyst, liver, or diaphragm.
10. The device of claim 7 , further comprising an elastomeric material covering at least the cylindrical saddle region.