Stent and method for manufacturing the same

• US 20040044402A1
• Filed: 06/13/2003
• Published: 03/04/2004
• Est. Priority Date: 09/03/2002
• Status: Active Grant

• Current Assignee: M.I. Tech Co., Ltd. (Synergy Innovation Co., Ltd.)
• Original Assignee: M.I. Tech Co., Ltd. (Synergy Innovation Co., Ltd.)
• Inventors: An, Sung-Soon, Jung, In-Kwon, Park, Hun-Kuk
• Granted Patent: US 7,182,788 B2
• Time in Patent Office: Days
• US Class Current: 623/1.24
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/24 Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
• CPC Class Codes: A61F 2/2476 Valves implantable in the body not otherwise provided for
• CPC Class Codes: A61F 2/89 the wire-like elements comprising two or more adjacent rings flexibly connected by separate members
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2250/0039 differing in diameter

Abstract

A stent includes a cylindrical main body contractible and expandable in a circumferential direction, a cover member coated on inner and/or outer circumference of the main body, and an inverse current preventing member for preventing food or fluid from reversely flowing. The inverse current preventing member is disposed in the main body and includes a fixing layer defining a passage having a diameter capable of allowing food and fluid to pass, the fixing layer being fixed in the main body and a valve layer extending from the fixing layer to a distal end of the main body.

Claims

1. A stent comprising:

a cylindrical main body contractible and expandable in a circumferential direction;

a cover member coated on inner and/or outer circumference of the main body; and

inverse current preventing means for preventing food or fluid from reversely flowing, the inverse current preventing means being disposed in the main body,

wherein the inverse current preventing means comprises;

a fixing layer defining a passage having a diameter capable of allowing food and fluid to pass, the fixing layer being fixed in the main body; and

a valve layer extending from the fixing layer to a distal end of the main body.

2. A stent of claim 1 wherein the valve layer is comprised of at least one extended wing defined by folding the valve layer.

3. A stent of claim 2 wherein the extended wing is extending radially from a central axis of the main body, the extended wing being formed in one of an inline shape, a wave shape, and a sawtooth shape.

4. A stent of claim 2 wherein a length of the valve layer is about 150% of a diameter of the main body or above 20% of a whole length of the stent.

5. A stent of claim 1 wherein the inverse current preventing means is formed of material selected from the group consisting of medical Polyurethane, Silicone-Urethane copolymer, Silicone, Polyamide, Polyester, fluoric resin.

6. A stent of claim 1 wherein the cover member is formed of material selected from the group consisting of medical Polyurethane, Silicone-Urethane copolymer, Silicone, Polyamide, Polyester, fluoric resin.

7. A stent of claim 1 further comprising sub-bodies for preventing the main body from displacing from an implanted position of a body lumen, the sub-bodies being formed on opposite ends of the main body.

8. A stent of claim 1 wherein the valve layer of the inverse current preventing means is fixed on at least one point of the cover member.

9. A method for manufacturing a stent, comprising the steps of:

preparing a cylindrical main body contractible and expandable in a circumferential direction;

forming a cover member on an inner and/or outer circumference of the main body;

locating inverse current preventing means formed by a casting process in the main body; and

bonding the located inverse current preventing means on the inner circumference of the main body.

10. A method of claim 9 wherein the step of bonding is realized by an adhesive solution or by a thermal bonding process.

11. A method of claim 9 wherein the step of bonding process is realized by heating the cover member in a state where the inverse current preventing means is located on the cover member formed on the inner circumference of the main body.

12. A method of claim 10 wherein the adhesive solution contains solvent selected from the group consisting of DMAC (N, N-DIMETHYLACETAMIDE), DMF (N,N-DIMETHYLFORMAMIDE), DMSO (DIMETHYLSULFOXIDE), THF (TETRAHYDROFURAN), XYLENE, TOLUENE, and CHLOROFORM.

13. A method of claim 12 wherein an amount of the solvent contained in the solution is 3-70 w %.

14. A method of claim 11 wherein the thermal bonding process is selected when the cover member and the inverse current preventing means are formed of fluoric resin.

15. A method of claim 9 wherein the inverse current preventing means is further fixed at a sub-bonding point formed on the inner circumference of the main body in the longitudinal direction.