Luminal structure anchoring devices and methods

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 defining a lumen for the fluid pathway, the central member having a middle portion, a lumen diameter, a distal end portion and a proximal end portion;
• and
• the distal end portion including a distal retention member and the proximal end portion including a proximal retention member, in an expanded configuration,
• whereby, in the expanded configuration, the distal retention member and the proximal retention member are separated and non-overlapping along the middle portion, a length of the middle portion is decreased and the lumen diameter of the central member along the middle portion is increased, the distal and proximal retention members comprising bent portions forming curves to present an atraumatic interface to appose the adjacent tissue layers of the first luminal body and second body, and terminal ends of the bent portions extend away from the adjacent tissue layers and are free of contact with the adjacent tissue layers.

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 for the fluid pathway and having a middle portion, a lumen diameter, a distal end portion and a proximal end portion;
• the distal end portion configured to move from a first configuration to a second configuration to form a distal retention member;
• and
• the proximal end portion configured to move from a first configuration to a second configuration to form a proximal retention member,
• whereby, in the second configuration of the distal retention member and the proximal retention member, the distal and proximal retention members are non-overlapping and separated by a distance along the middle portion, a length of the middle portion is decreased and the lumen diameter of the central member along the middle portion is increased, the distal and proximal retention members comprising bent portions forming curves to present an atraumatic interface to appose the adjacent tissue layers of the first luminal body and second body, and terminal ends of the bent portions extend away from the adjacent tissue layers and are free of contact with the adjacent tissue layers.