Gastrointestinal device
A gastrointestinal device and method for retrieving the device are disclosed. The device may include a stent including a plurality of strands forming first and second ends, the strands configured to move between a retrieval configuration, with substantially parallel strands, and a deployed configuration, wherein the strands form proximal and distal portions having first and second diameters larger than the pyloric sphincter. The device may include a connector assembly including proximal, middle, and distal connectors. The middle connector may be coupled to the proximal and distal connectors when the strands are in the deployed configuration. The strands may be attached to the proximal and distal connectors and the first and second ends. The device may include a release mechanism configured to decouple the proximal connector from the middle connector. Decoupling of the proximal and middle connectors may allow the strands to move from the deployed to retrieval configuration.
1. A gastrointestinal device for reducing flow through a pyloric sphincter of a patient, comprising:
a stent including a plurality of strands forming first and seconds ends, the plurality of strands configured to move between a retrieval configuration, wherein the stent is aligned along a long axis of the gastrointestinal device, and a deployed configuration, wherein the plurality of strands form a proximal portion having a first diameter and a distal portion having a second diameter, the first and second diameters being larger than a diameter of the pyloric sphincter;
a connector assembly including a proximal connector, a middle portion, and a distal connector, the middle portion coupled to the proximal connector and the distal connector when the plurality of strands are in the deployed configuration and the plurality of strands being attached at the first end to the proximal connector and at the second end to the distal connector;
a release mechanism attached to the proximal connector and configured to decouple the proximal connector from the middle portion, wherein decoupling of the proximal connector and the middle portion allows the plurality of strands to move from the deployed configuration to the retrieval configuration.
2. The device of claim 1 , wherein the release mechanism includes a hook and the release mechanism is configured to decouple the proximal connector and the middle portion when the hook is pulled.
3. The device of claim 2 , wherein the release mechanism is configured to move the plurality of strands from the deployed configuration to the retrieval configuration by pulling on the hook when the proximal connector and the middle portion are decoupled.
4. The device of claim 1 , wherein the release mechanism includes a pin extending into the proximal connector and the middle portion.
5. The device of claim 1 , wherein the middle portion is coupled to the proximal connector by a threaded connection when the plurality of strands is in the deployed configuration and the release mechanism is configured to allow the middle portion and the proximal connector to unscrew from each other.
6. The device of claim 5 , wherein the release mechanism includes a pin extending at least partially through the threaded connection between the proximal connector and the middle portion.
7. The device of claim 6 , wherein the release mechanism includes a hook and the release mechanism is configured to decouple the proximal connector and the middle portion when the hook is pulled and the pin is removed from the threaded connection.
8. A method of retrieving a gastrointestinal device for reducing flow through a pyloric sphincter of a patient, the method comprising:
engaging a release mechanism attached to a device in a deployed configuration comprising a stent including a plurality of strands forming a proximal portion having a first diameter and a distal portion having a second diameter, the first and second diameters being larger than a diameter of the pyloric sphincter;
actuating the release mechanism to allow the device to move from the deployed position to a relaxed position;
applying a force to the release mechanism to cause the device to move to a retrieval configuration in which the stent is aligned along a long axis of the gastrointestinal device; and
removing the device from the patient while the device is in the retrieval configuration;
wherein the plurality of strands includes first and seconds ends, the first end attached to a proximal connector of the device, the second end attached to a distal connector of the device, and the release mechanism coupled to the proximal connector.
9. The method of claim 8 , wherein the release mechanism includes a hook and the engaging step includes snaring the hook.
10. The method of claim 9 , wherein the actuating step includes pulling on the hook to remove a pin from the device and the applying step includes continuing to pull on the hook to cause the device to move to the retrieval position.
11. The method of claim 10 , wherein the hook is attached to a proximal connector of the device and the pin is configured to allow the proximal connector to decouple from a middle portion of the device when removed.
12. The method of claim 8 , wherein applying the force to the release mechanism causes a proximal connector of the device to decouple from a middle portion of the device.
13. The method of claim 12 , wherein the proximal connector is coupled to the middle portion by a threaded connection when the device is in the deployed configuration and applying the force to the release mechanism causes the proximal connector to unscrew from the middle portion.
14. A gastrointestinal device for reducing flow through a pyloric sphincter of a patient, comprising:
a stent including a plurality of strands, the plurality of strands configured to move between a retrieval configuration, wherein the stent is aligned along a long axis of the gastrointestinal device, and a deployed configuration, wherein the plurality of strands form a proximal portion having a first diameter and a distal portion having a second diameter, the first and second diameters being larger than a diameter of the pyloric sphincter;
a connector assembly including a proximal connector, a middle portion, and a distal connector, the middle portion coupled to the proximal connector and the distal connector when the plurality of strands are in the deployed configuration and the plurality of strands being attached at one end to the proximal connector and at another end to the distal connector;
the middle portion being coupled to the proximal connector by a threaded engagement having a pitch of 2 to 8 mm;
a release mechanism attached to the proximal connector and configured to allow the proximal connector to unscrew from the middle portion and allow the plurality of strands to move from the deployed configuration to the retrieval configuration.
15. The device of claim 14 , wherein the release mechanism includes a hook and the release mechanism is configured to allow the proximal connector to unscrew from the middle portion when the hook is pulled.
16. The device of claim 15 , wherein the release mechanism is configured to move the plurality of strands from the deployed configuration to the retrieval configuration by pulling on the hook when the proximal connector and the middle portion are decoupled.
17. The device of claim 14 , wherein the release mechanism includes a pin extending through the threaded engagement between the proximal connector and the middle portion.
18. The device of claim 17 , wherein the release mechanism includes a hook and the release mechanism is configured to allow the proximal connector to unscrew from the middle portion when the hook is pulled and the pin is removed from the threaded engagement.
19. The device of claim 14 , wherein the threaded engagement has a pitch of 3.5 to 6 mm.