ABDOMINAL CAVITY-VEIN SHUNT STENT

• US 20130325103A1
• Filed: 02/18/2011
• Published: 12/05/2013
• Est. Priority Date: 02/18/2011
• Status: Active Grant

• Current Assignee: National Cancer Center, Piolax Medical Devices, Inc. (Piolax Incorporated)
• Original Assignee: National Cancer Center, Piolax Medical Devices, Inc. (Piolax Incorporated)
• Inventors: Arai, Yasuaki, Sakai, Shinichi
• Granted Patent: US 9,393,133 B2
• Time in Patent Office: Days
• US Class Current: 623/1.24
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/2418 Scaffolds therefor, e.g. support stents
• CPC Class Codes: A61F 2/2475 Venous valves
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61M 2202/0401 Ascitics
• CPC Class Codes: A61M 27/002 Implant devices for drainage of body fluids from one part of the body to another intraocular A61F9/00781; middle ear A61F11/202
• CPC Class Codes: A61M 39/22 Valves or arrangement of valves A61M39/02, A61M39/0247, A61M39/16 take precedence; regulating valves in infusion systems A61M5/16881; in devices worn by the patient for the reception of urine, faeces, catamenial or other discharge, or in colostomy devices A61F5/4405

Abstract

An abdominal cavity-vein shunt stent provided for transporting ascites accumulated in the abdominal cavity of a patient to a vascular system, includes: a stent body which extends cylindrically long and which has one end disposed in the intrahepatic vein, and the other end piercing the liver parenchyma and disposed in the abdominal cavity; and a one-way valve which is disposed in the stent body, which is opened to drain ascites into the intrahepatic vein when a differential pressure obtained by subtracting the pressure of the intrahepatic vein from the pressure in the abdominal cavity is not lower than a predetermined value, and which is closed when the differential pressure is lower than the predetermined value.

Claims

1. A stent for transporting ascites accumulated in the abdominal cavity of a patient to a vascular system, including:

a cylindrically-extending stent body which has one end disposed in an intrahepatic vein and the other end disposed in the abdominal cavity by piercing a liver parenchyma;

a one-way valve which is disposed in the stent body, which is opened to drain the ascites into the intrahepatic vein when a differential pressure obtained by subtracting a pressure of the intrahepatic vein from a pressure in the abdominal cavity is not lower than a predetermined value, and which is closed when the differential pressure is lower than the predetermined value; and

a cover member which is arranged in a portion of the stent body passing through the liver parenchyma, prevents the liver parenchyma from entering the stent body,

wherein the one-way valve is integrally formed with the cover member at an intrahepatic vein side, and the one-way valve and the cover member are disposed on an inner circumferential side of the stent body.

2. The abdominal cavity-vein shunt stent of claim 1,

wherein an entrance preventing member which prevents organs in the abdominal cavity from entering the stent body is provided in an opening of the other end of the stent body which is disposed in the abdominal cavity.

4. The abdominal cavity-vein shunt stent of claim 1,

wherein a portion of the stent body which is disposed in the intrahepatic vein is shaped like mesh.

5. The abdominal cavity-vein shunt stent of claim 1,

wherein a stent recovery handle is provided at the one end of the stent body which is disposed in the intrahepatic vein.

3. (canceled)

6. (canceled)