Internal drainage catheter for ascites drainage

An internal drainage catheter for ascites drainage, comprising:

• a main conduit portion configured for passing through a bladder wall serving as a basis for separating a peritoneal cavity from a bladder, such that both ends of the main conduit portion are configured to be located at the peritoneal cavity and the bladder, respectively, the main conduit portion being formed in a tubular shape to form a flow path enabling fluid movement inside;
• a peritoneal cavity-side anchoring portion extending from one end of the main conduit portion, the peritoneal cavity-side anchoring portion configured to be located on a side of the peritoneal cavity, the peritoneal cavity-side anchoring portion configured for passing through the inside of a laparoscope to approach the bladder wall, while being elongated along the same axis as the main conduit portion, being wound into a ring shape by an elastic restoring force when the peritoneal cavity-side anchoring portion is separated from the inside of the laparoscope, the peritoneal cavity-side anchoring portion including an inlet via which ascites is introduced;
• and
• a bladder-side anchoring portion extending from the other end of the main conduit portion, the bladder-side anchoring portion configured to be located on a side of the bladder, the bladder-side anchoring portion configured for passing through the inside of the laparoscope to approach the bladder wall, while being elongated along the same axis as the main conduit portion, being wound into a ring shape by an elastic restoring force when the bladder-side anchoring portion is separated from the inside of the laparoscope, including an outlet via which the ascites is discharged, the bladder-side anchoring portion provided with a check valve for selectively opening and closing the outlet,
• wherein the check valve is in the form of a film of which one side is connected to a portion of the bladder-side anchoring portion adjacent to the outlet, and has an elastic film structure provided to be elastically deformed according to a pressure due to the movement of the ascites discharged via the outlet, thereby selectively opening and closing the outlet.