Retrievable access valve
Medical devices and methods for making and using medical devices are disclosed. An example medical device may include an access valve that may be retrieved after implantation. The access valve may include a frame having a lumen, a self-expandable member extending through the lumen, and an elastic membrane extending through the lumen and a second end of the frame to releasably seal the lumen. The access valve may releasably attach to a wall of a patient and releasably seal an opening through the wall. The access valve may be attached to the wall by placing the frame adjacent the wall, extending the self-expandable member through the opening in the wall, and expanding the self-expandable member such that the self-expandable member applies a first force against the wall and a second force opposite the first force against the frame to sandwich the wall between the self-expandable member and the frame.
1 . A method of inserting an access device across a stomach wall, the method comprising:
advancing an access device to a target location on the stomach wall, the access device being expandable from a collapsed delivery configuration to an expanded implanted configuration, the access device including a cylindrical body region, a first expandable member disposed adjacent a first end of the cylindrical body region, and a second expandable member disposed adjacent a second end of the cylindrical body region; and
inserting the cylindrical body region through the stomach wall and expanding the access device including the first expandable member, the cylindrical body region, and the second expandable member, wherein expanding the first expandable member results in a portion of the first expandable member rolling over on itself and extending toward the second end of the cylindrical body, wherein the first expandable member applies a compressive force in a first axial direction toward the second expandable member and the second expandable member applies a compressive force in a second axial direction toward the first expandable member.
2 . The method of claim 1 , wherein expanding the first and second expandable members includes expanding each of the first and second expandable members radially outward from the cylindrical body region such that each of the first and second expandable members has an outer diameter larger than an outer diameter of the cylindrical body region.
3 . The method of claim 2 , wherein advancing the access device to the target location includes inserting a guidewire into the stomach and through the stomach wall at the target location and then advancing the access device over the guidewire to the target location.
4 . The method of claim 1 , wherein advancing the access device to the target location includes advancing a delivery sheath through the stomach to the target location with the access device contained therein in the collapsed delivery configuration.
5 . The method of claim 4 , wherein inserting the cylindrical body region through the stomach wall includes inserting a distal end of the delivery sheath at least partially through the stomach wall and then withdrawing the delivery sheath from the access device with the second expandable member positioned outside the stomach, and allowing the second expandable member to self-expand, wherein during expansion the second expandable member curls radially outward and then toward the first expandable member.
6 . The method of claim 5 , further comprising withdrawing the delivery sheath from an entirety of the access device and allowing the first expandable member to self-expand such that the first expandable member is positioned inside the stomach and the cylindrical body region extends across the stomach wall.
7 . The method of claim 1 , wherein advancing the access device to the target location includes inserting an endoscope into the stomach and delivering the access device through the endoscope.
8 . The method of claim 1 , wherein the access device further includes a frame with the cylindrical body region extending through the frame, the first expandable member extending out of a first end of the frame, and the second expandable member extending out of a second end of the frame, wherein expanding the first expandable member and the second expandable member includes positioning the second end of the frame in contact with the stomach wall, with the stomach wall sandwiched between the second end of the frame and the second expandable member.
9 . The method of claim 1 , wherein the cylindrical body region provides a conduit for fluid to flow therethrough such that inserting the cylindrical body through the stomach wall and expanding the access device results in fluid flow through the access device across the stomach wall.
10 . The method of claim 1 , wherein the access device is formed from a metal braid.
11 . The method of claim 10 , wherein the metal braid is self-expandable from the collapsed delivery configuration to the expanded implanted configuration.
12 . The method of claim 1 , wherein the access device includes a valve configured to selectively allow fluid to pass through the access device.
13 . The method of claim 12 , wherein the valve is biased closed.
14 . The method of claim 12 , wherein the valve includes a valve membrane disposed along an inner surface of at least the cylindrical body region of the access device.
15 . A method of inserting an access device across a stomach wall, the method comprising:
inserting a guidewire into a patient's stomach and through the stomach wall at a target location;
advancing a self-expanding access device over the guidewire to the target location, the access device being expandable from a collapsed delivery configuration to an expanded implanted configuration, the access device including a cylindrical body region, a first expandable member disposed adjacent a first end of the cylindrical body region, and a second expandable member disposed adjacent a second end of the cylindrical body region; and
inserting the cylindrical body region through the stomach wall and expanding the access device including the first expandable member, the cylindrical body region, and the second expandable member, such that the first expandable member is positioned inside the stomach, the second expandable member is positioned outside the stomach, and the cylindrical body region extends across the stomach wall, wherein during expansion a portion of the second expandable member curls radially outward away from the cylindrical body region and then towards the first expandable member.
16 . The method of claim 15 , wherein the first expandable member applies a compressive force in a first axial direction toward the second expandable member and the second expandable member applies a compressive force in a second axial direction toward the first expandable member.
17 . The method of claim 15 , wherein advancing the access device to the target location includes advancing a delivery sheath over the guidewire through the stomach to the target location and at least partially through the stomach wall with the access device contained therein in the collapsed delivery configuration, and then withdrawing the delivery sheath from the first and second expandable members and allowing the first and second expandable members to self-expand and curl radially outward and toward an opposing end of the cylindrical body region.
18 . The method of claim 15 , wherein the access device further includes a frame with the cylindrical body region extending through the frame, the first expandable member extending out of a first end of the frame, and the second expandable member extending out of a second end of the frame, wherein expanding the first expandable member and the second expandable member includes positioning the second end of the frame in contact with an inner surface of the stomach wall.
19 . The method of claim 15 , wherein the access device is formed from a metal braid.
20 . The method of claim 15 , wherein the access device includes a valve configured to selectively allow fluid to pass through the access device across the stomach wall.