Abdominal cavity-vein shunt stent

• US 9,393,133 B2
• Filed: 02/18/2011
• Issued: 07/19/2016
• Est. Priority Date: 02/18/2011
• Status: Expired due to Fees

• Current Assignee: National Cancer Center, Piolax Medical Devices, Inc. (Piolax Incorporated)
• Original Assignee: National Cancer Center, Piolax Medical Devices, Inc. (Piolax Incorporated)
• Inventors: Sakai, Shinichi, Arai, Yasuaki
• Primary Examiner(s): PREBILIC, PAUL B
• Application Number:
  US14/000,090
• Publication Number:
  US 20130325103A1
• Time in Patent Office: 1,978 Days
• Field of Search: 623 124- 126
• US Class Current: 1/1
• 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. An abdominal cavity-vein shunt stent for transporting ascites accumulated in an abdominal cavity of a patient to a vascular system, including:

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

a one-way valve disposed on an inner circumference of the stent body and configured to have flow in a single direction based on a differential pressure so as to be 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 so as to be closed when the differential pressure is lower than the predetermined value, the stent-body covering an entire length of the one-way valve; and

a cover member disposed in a portion of the stent body which is adapted to pass through the liver parenchyma from the intrahepatic vein to the abdominal cavity so that the liver parenchyma is prevented from entering the stent body,

wherein the one-way valve is integrally formed with the cover member at a side thereof which is adapted to be disposed in the intrahepatic vein, and the one-way valve and the cover member are disposed on the inner circumference of the stent body,

wherein the cover member is not disposed in a portion of the stent body on an outer circumference of the one-way valve,

wherein the portion of the stent body in which the cover member is not disposed is mesh-shaped, and is opened when the one-way valve is closed,

wherein an outer diameter of the one-way valve is separated from an inner diameter of the stent body when the one-way valve is in a closed state,

wherein the outer diameter of the one-way valve is closer to the inner diameter of the stent body when the one-way valve is in an opened state,

wherein an entirety of the stent body has a constant diameter, and

wherein an entrance preventing member of mesh adapted to prevent organs in the abdominal cavity from entering the stent body is provided over an opening of the other end of the stent body which is adapted to be disposed in the abdominal cavity.

2. 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 adapted to be disposed in the intrahepatic vein.

3. The abdominal cavity-vein shunt stent of claim 1, wherein the predetermined value of the differential pressure for opening the one-way valve is set in a range of 0 to 980 Pa.

4. The abdominal cavity-vein shunt stent of claim 1, wherein the predetermined value of the differential pressure for opening the one-way valve is set in a range of 98 to 294 Pa.

5. The abdominal cavity-vein shunt stent of claim 1, further comprising markers of a radiopaque metal.

6. The abdominal cavity-vein shunt stent of claim 1, wherein a total length of the stent body is in a range of 20 to 100 mm.

7. The abdominal cavity-vein shunt stent of claim 1, wherein a total length of the stent body is in a range of 40 to 50 mm.

8. The abdominal cavity-vein shunt stent of claim 1, wherein an outer diameter of the stent body is in a range of 3 to 15 mm.

9. The abdominal cavity-vein shunt stent of claim 1, wherein an outer diameter of the stent body is in a range of 5 to 7 mm.

10. The abdominal cavity-vein shunt stent of claim 1, wherein the stent body comprises a flexible material.

11. The abdominal cavity-vein shunt stent of claim 1, wherein the entrance preventing member is narrowed while extending in an axial direction from a circumferential edge of the other end of the stent body.

12. The abdominal cavity-vein shunt stent of claim 1, wherein the one-way valve does not protrude from the one end and the other end of the stent body.