Abstract: A prosthetic heart valve using a pericardium is disclosed where: three hetero-biological tissue slices, which are extracted in a quadrangular shape from a bovine pericardium or a porcine pericardium, are prepared; each hetero-biological tissue slice is folded so as to form an inner tissue slice inside and an outer tissue slice outside, the outer tissue slice being longer than the inner tissue slice; each of the inner tissue slice and outer tissue slice is coupled by sewing in a semicircular shape with a first coupling thread such that each inner tissue slice forms a pulmonic valve slice inside the first coupling thread and a fixing slice outside the first coupling thread such that each hetero-biological tissue slice is formed in a cylindrical shape by allowing each slice to be adjacent to each other. The disclosed prosthetic heart valve has increased durability and prevents reverse blood flow.

Abstract: A prosthetic heart valve using a pericardium is disclosed where: three hetero-biological tissue slices, which are extracted in a quadrangular shape from a bovine pericardium or a porcine pericardium, are prepared; each hetero-biological tissue slice is folded so as to form an inner tissue slice inside and an outer tissue slice outside, the outer tissue slice being longer than the inner tissue slice; each of the inner tissue slice and outer tissue slice is coupled by sewing in a semicircular shape with a first coupling thread such that each inner tissue slice forms a pulmonic valve slice inside the first coupling thread and a fixing slice outside the first coupling thread such that each hetero-biological tissue slice is formed in a cylindrical shape by allowing each slice to be adjacent to each other. The disclosed prosthetic heart valve has increased durability and prevents reverse blood flow.

Abstract: Disclosed herein is a stent for prostatic urethra expansion which does not generate bladder stones, is removable without causing injury on a urethra, and does not generate atrophy of a prostatic urethra even after removal. The stent for prostatic urethra expansion include a stent unit including a cylindrical body with space parts formed by knotting or crossing shape memory alloy wires and bending terminals formed at both ends of the cylindrical body, a pair of hook wires passing through the space parts and knotted to the shape memory alloy wires, both ends thereof being wound on the bending terminals and then being bent upwardly to produce hooks, and a pair of hanging strings arranged in opposite directions to form a hanging knot. The stent for prostatic urethra expansion does not move into the bladder, and expands and maintains a lumen of the stenosed prostatic urethra, thereby reducing post-operative recovery time.

Abstract: A self-expandable shape memory alloy stent includes first and second wires made of super-elastic shape memory alloy. The first wire extends downwardly from the top to the bottom of the stent without interlocking with itself but extends upwardly from the bottom to the top of the stent while interlocking with itself to leave a multiplicity of rhombic spaces. Similarly, the second wire extends downwardly from the top to the bottom of the stent without interlocking with itself but extends upwardly from the bottom to the top of the stent while interlocking with itself, in such a manner as to divide the rhombic spaces formed by the first wire into four small rhombic spaces. The first wire and the second wire are woven with each other in such a manner that the second wire passes alternately below and above the first wire at intersection points.

Abstract: A heart valve prosthesis and a method of fabricating the same. The heart valve prosthesis uses a leaflet of pig pericardium or a leaflet of cattle pericardium, which has a suitable thickness according to the size of the valve, and a stent. The heart valve prosthesis is fabricated by placing a valve body over a Dacron body, binding the valve body to the Dacron body using stitching fiber, rolling the Dacron body into a cylindrical form such that the valve body is located inside, binding opposite edges of the Dacron body to each other using stitching fiber, and inserting the resultant structure into a stent, which is knitted using a shape memory alloy wire. The heart valve prosthesis is friendly to and is not rejected by human tissue, is free from deformation, and can be implanted using a non-invasive manner without incising the chest wall of a patient.

Abstract: Disclosed herein is a stent for prostatic urethra expansion which does not generate bladder stones, is removable without causing injury on a urethra, and does not generate atrophy of a prostatic urethra even after removal. The stent for prostatic urethra expansion include a stent unit including a cylindrical body with space parts formed by knotting or crossing shape memory alloy wires and bending terminals formed at both ends of the cylindrical body, a pair of hook wires passing through the space parts and knotted to the shape memory alloy wires, both ends thereof being wound on the bending terminals and then being bent upwardly to produce hooks, and a pair of hanging strings arranged in opposite directions to form a hanging knot. The stent for prostatic urethra expansion does not move into the bladder, and expands and maintains a lumen of the stenosed prostatic urethra, thereby reducing post-operative recovery time.

Abstract: Disclosed herein is a drawstring for removal of a stent. The drawstring includes a circumferential string which is made of soft material and is formed in an end of the stent body in an annular shape. A hook loop is formed by tying opposite ends of the circumferential string to each other. The hook loop protrudes a relatively long distance from the stent body. A marking wire made of radiopaque material is wound around the hook loop. Therefore, when X-rays or endoscope are applied to a relative portion of a patient's body, the position of the hook loop can be easily detected. Furthermore, because the hook loop is made of flexible and soft material, even though it comes into contact with an internal organ of the patient's body, the organ is prevented from being damaged by the hook loop.

Abstract: A self-expandable shape memory alloy stent includes first and second wires made of super-elastic shape memory alloy. The first wire extends downwardly from the top to the bottom of the stent without interlocking with itself but extends upwardly from the bottom to the top of the stent while interlocking with itself to leave a multiplicity of rhombic spaces. Similarly, the second wire extends downwardly from the top to the bottom of the stent without interlocking with itself but extends upwardly from the bottom to the top of the stent while interlocking with itself, in such a manner as to divide the rhombic spaces formed by the first wire into four small rhombic spaces. The first wire and the second wire are woven with each other in such a manner that the second wire passes alternately below and above the first wire at intersection points.