Duodenum built-in jejunum cannula releasing system and a use method therefor

A jejunum cannula releasing system configured to be built in duodenum, comprising an implanting device, a pushing assembly, a fixing line and a releasing line,

• wherein the implanting device comprises a storage tube shell, a releaser, a membrane tube and a stent, wherein the storage tube shell is tubular, the storage tube shell has a proximal opening and a distal opening, the membrane tube and the stent to be released are arranged in the storage tube shell in a folded state, a proximal end of the membrane tube is connected with a distal end of the stent, and the releaser is provided at the distal opening of the storage tube shell and connected with a distal end of the membrane tube;
• the pushing assembly comprises a push-pull guidewire, an inner tube, a middle tube and an outer tube, which are sleeved on one another from the inside out in sequence and are movable relatively with respect to each other, wherein a distal end of the push-pull guidewire abuts against the releaser;
• a part of the inner tube is located inside the storage tube shell and connected with the releaser;
• one end of the middle tube protrudes into the storage tube shell through the proximal opening of the storage tube shell, and the one end of the middle tube is fixedly provided with a pushing block located in the storage tube shell for pushing against the stent;
• the outer tube is located outside the storage tube shell and has one end directly or indirectly fixedly connected to the proximal opening of the storage tube shell;
• one end of the releasing line is fixed on the inner tube, and the other end of the releasing line is a free end;
• and one end of the fixing line is fixed on the middle tube, and the other end of the fixing line cooperates with the free end of the releasing line to form a slipknot to connect the membrane tube and the releaser,
• wherein the releaser has an inner cavity, an outer circumferential wall of the releaser is provided with one hole A and at least two holes C communicating with the inner cavity, one or more grooves A are provided on a side wall of the releaser, each of the grooves A connects the hole A and one of the holes C and is used as a wiring channel between the hole A and the one of the holes C, a groove B is provided between adjacent holes C, and the groove B is configured to connect a wiring channel between adjacent holes C;
• the releasing line is fixed to a distal end of the inner tube, and the free end of the releasing line enters the inner cavity of the releaser and is led out from the hole A at a top end of the releaser, and is wound on the outer circumferential wall of the releaser in a circumferential distributed direction of a plurality of the holes C after passing through one of the one or more grooves A and the groove B in sequence;
• holes B, corresponding to the holes C, are provided on an outer circumferential wall at the distal end of the membrane tube, the other end of the fixing line penetrates through an inner cavity of the membrane tube, passes through one of the holes B on the membrane tube and one of the holes C on the releaser corresponding to the one of the holes B, bypasses the releasing line and then passes through the one of the holes C and the one of the holes B to get back to the inner cavity of the membrane tube, then said process is repeated until this end of the fixing line passes through remaining holes B on the membrane tube and corresponding holes C on the releaser in sequence.