Medical retainer and medical operation using the same

A natural orifice medical operation using a medical retainer for sealing a fluid, the retainer being retained in a duodenum of a patient, the medical retainer comprising:

• a sealing section for sealing the fluid, the sealing section making contact with a wall of the duodenum;
• a main body having a passageway, one portion of the main body being surrounded by the sealing section;
• a first one-way valve disposed in the passageway for allowing flow of the fluid only from downstream to upstream in an insertion direction of the retainer;
• a first tube for suctioning the fluid accumulated in a downstream portion of the gastrointestinal tract with respect to a detained position of the retainer, wherein
• the first tube is detachably connected through the first one-way valve to the passageway, the first tube is inserted through an upstream portion of the gastrointestinal tract;
• the first tube is communicated between the downstream portion of the gastrointestinal tract and an exterior of a patient;
• the main body has an upstream surface facing an upward portion of the gastrointestinal tract and a downstream surface facing a downward portion of the gastrointestinal tract;
• and
• the first one-way valve is formed on the upstream surface of the passageway,
• the operation comprising:
• inserting the medical retainer into the duodenum of a patient by using an endoscopic device;
• retaining the medical retainer in the duodenum;
• conducting a medical treatment on the patient;
• and
• collecting the medical retainer from the inside of the patient to the exterior of the patient.