Abstract: The invention relates to a stent provided with cauterization system. A stent operating apparatus in which a stent moves to a lesion of a tubular tissue through a plurality of pipe members and performs an operation includes: a bipolar electrode for cauterization configured to be disposed at an operation end of the pipe member to cauterize the lesion; and a high frequency generator configured to be connected to the bipolar electrode for cauterization to allow the bipolar electrode for cauterization radiate a high frequency current, whereby the lesion may be cauterized and necrotized by the bipolar electrode of a tip portion of a moving pipe charged with the stent before or after the stent is operated on the lesion, thereby effectively preventing a re-stricture from occurring at the lesion operated by the stent.

Abstract: Provided a medical snare in which the expansion direction of a loop is easily rotated in an arbitrary direction in which a removable target has grown, the removable target is easily inserted into the loop so as to allow a surgical procedure to be easily performed to reduce a time required for the surgical procedure and burdens of a patient and a surgeon, and the free rotation of a wheel is prevented to be able to fix the expansion direction of the loop. Accordingly, only the wheel can be easily rotated to switch the expansion direction of the loop without rotating the entire medical snare.

Abstract: A partially biodegradable stent includes a main net body of hollow cylindrical shape formed of elastically deformable wires interlaced with each other, the net body extending in a longitudinal direction and terminating at open opposite ends, and an auxiliary net portion provided at one of the open opposite ends of the main net body, the auxiliary net portion formed of a biodegradable wire which can be degraded and removed by a bodily fluid. The auxiliary net portion is formed by interlacing the biodegradable wire into a cylindrical shape independently of the main net body or by interlacing the biodegradable wire with the elastically deformable wires at one of the open opposite ends of the main net body.

Abstract: A monorail guides a guide wire introduced into an outer tube in a catheter for stent surgery. The catheter includes the outer tube having an outer hole, an inner tube installed in the outer tube, and a guide wire inserted into the outer hole and the inner tube and protruding outwards from a front end of the inner tube so that the outer tube and the inner tube move along the guide wire so as to be guide a stent. The monorail includes a separation guide which is inserted into and fixed in the outer tube and configured such that the guide wire that is inserted into the outer hole is spaced apart from the inner tube without making contact with the inner tube.

Abstract: An insertion device for a plastic stent includes an operation unit which is operated to move a movable wire forward or backward, a tip portion connected to an end of the movable wire, a tube connected to the operation unit, and a plurality of expanding members which are connected between a plurality of tip end portions of the tip portion in an alternate manner. The expanding member is made of soft or flexible material so that it is contracted in a longitudinal direction and expanded in a radial direction when the tip portion is moved backward. Because the expanding members are expanded in diameter when the movable wire is moved backward by the operation of the operation unit, an external surface of the expanding member comes into contact with an internal surface of the plastic stent and is securely held by the internal surface of the plastic stent.

Abstract: A high-frequency treatment device includes a tubular body having a front end portion and a rear end portion; an operating handle having a high-frequency port and a main push rod extending through the body, the operating handle slidably fitted to the body; a front tube having a rear end portion connected to the front end portion of the body; an auxiliary push rod rotatably connected to the main push rod, the auxiliary push rod extending into the front tube; a wire fixed to the auxiliary push rod, the wire extending through the front tube; a rotary knob rotatably attached to the body, the rotary knob configured to rotate together with the auxiliary push rod and the wire; and an arc-shaped knife fixed to the wire and connected to the high-frequency port of the operating handle via the wire, the auxiliary push rod and the main push rod.

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: Provided a medical snare in which the expansion direction of a loop is easily rotated in an arbitrary direction in which a removable target has grown, the removable target is easily inserted, into the loop so as to allow a surgical procedure to be easily performed to reduce a time required for the surgical procedure and burdens of a patient and a surgeon, and the free rotation of a wheel is prevented to be able to fix the expansion direction of the loop. Accordingly, only the wheel can be easily rotated to switch the expansion direction of the loop without rotating the entire medical snare.

Abstract: Provided is a method for manufacturing a stent having a superior bending characteristic, in which a basic jig is employed to weave wires by alternating an obtuse angle and an acute angle so as to repetitively form starry cells in left and right portions and upper and lower portions of the stent, and in which the wires intersecting each other in the starry cells are allowed to freely move to provide the superior bending characteristic caused by flexibility in both the diametrical direction and lengthwise direction thereof, and the stent manufactured thereby. Thus, the stent can have a flexible bending characteristic and is prevented from being folded even when sharply bent after being coated.

Abstract: Provided is a catheter operating structure in which a medical device such as a stent is rotated to move forward or backward without being repeatedly pushed or pulled when inserted into the lumen of a human body, so that a surgical position can be precisely adjusted by the forward or backward movement. A rotary member includes a spiral shaft formed on a handle so as to be inserted into a tubular body. A movable member includes a female spiral end that is formed at one end thereof and is spirally coupled with the spiral shaft. An injection member moving member moves together with the movable member. When the spiral shaft is rotated by rotation of the handle with the spiral shaft spirally coupled to the female spiral end, the movable member moves forward or backward without being rotated due to the injection member moving member.

Abstract: A stent system includes a stent and a drawstring for removal of the stent. The drawstring includes an end string, a longitudinal string and a circumferential string. The end string is formed in an end of the stent body in an annular shape in such a way that the end string passes, in a zigzag manner, through mesh arranged in a circumferential direction of the stent body. A hook loop is formed by tying opposite ends of the end string to each other. The longitudinal string extends at a first end thereof from the end string in the longitudinal direction of the stent body. The circumferential string extends from a second end of the longitudinal string and is formed in an annular shape in such a way that the circumferential string passes, in a zigzag manner, through mesh arranged in the circumferential direction of the stent body.

Abstract: A stent inserting device is used in inserting a self-expandable stent with leading and trailing ends into a tubular organ of a living body. The stent inserting device includes a grip body, an external tube attached to a front end of the grip body, a push member movably inserted into the external tube from a rear end of the grip body, and a tubular cap for removably receiving the stent in a compressed state. The tubular cap has a front end operatively connected to the push member and a rear end slidably fitted to a front end of the external tube. The stent inserting device is designed to hold the stent within the tubular cap in such a manner that the stent is first expanded at the trailing end and then gradually expanded toward the leading end when the tubular cap is pushed away from the external tube.

Abstract: A balloon type stent system for treatment of obesity is disclosed. An injection expansion unit and a plurality of distribution expansion units extend in a longitudinal direction of a stent unit body formed by coupling two sheets of synthetic vinyl in the shape of a cylinder. The injection expansion unit has an expansion agent injection port, and the distribution expansion units each have a distribution injection port communicating with a distribution channel. Connection ends are partially cut in the longitudinal direction such that the expansion units are divided into an integrated expansion unit and a separated expansion unit. The injection expansion unit and the distribution expansion units constituting the separated expansion unit are bent outward to form a balloon type stent unit. A tube has a length corresponding to a lumen length of the duodenum, and the tube is connected to the stent unit body by a connection wire.

Abstract: An electrode needle includes an electrode needle body, a metal tube, and an outer insulating tube. The electrode needle body is connected to a positive electrode of an RF generator. The metal tube is fixed around the electrode needle body and insulated from the electrode needle body. The metal tube is connected to a negative electrode of the RF generator. The outer insulating tube surrounds an upper part of the metal tube to expose a lower part of the metal tube. The outer insulating tube is movable longitudinally along the electrode needle body to vary an exposed area of the metal tube. At least one of a position, an area, and a cauterization speed of a site to be cauterized is controlled by varying the exposed area of the metal tube.

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: Provided is a combinable electrode needle base structure in which a base to which electrode needles are coupled can be used in a combined or separated state to use the electrode needles according to the size and location of a lesion. In the combinable electrode needle structure, electrode needles are connected to the front side of an electrode needle base, and receive RF waves from RF (radio frequency) generator. The electrode needle base is divided into dividable bases to which the electrode needles are respectively coupled. When a lesion to be cauterized is large or cauterization should be concentrated, the dividable bases are combined and then used, and when a lesion is small or lesions are scattered, the dividable bases may be separated and then used.

Abstract: A double-tube type stent is inserted into a hollow tubular organ such as a bile duct so as to relieve narrowing of the bile duct on, for instance, an anastomotic area of the intrahepatic bile duct of a liver transplant patient. A hollow cylindrical body has a plurality of rhombic spaces formed by weaving a superelastic shape-memory-alloy wire so as to be crossed. A silicon coating layer is coated on an outer surface of the cylindrical body using a silicon solution. A polytetrafluoroethylene (PTFE) tube is fixedly fitted around the cylindrical body having the silicon coating layer leaving a gap therebetween.

Abstract: Disclosed are a coating agent for drug releasing stents, a method for preparing the same and a drug releasing stent coated therewith. The coating agent comprises a biologically active material and a coating material selected from among pullulan acetate, represented by the following Chemical Formula 1, and a polyurethane-surfactant mixture.

Abstract: Disclosed are a coating agent for drug releasing stents, a method for preparing the same and a drug releasing stent coated therewith. The coating agent for drug releasing stents comprises nanoparticles with a biologically active material entrapped therein, wherein the particles are formed of a polyethyleneimine (PEI)-deoxycholic acid (DOCA) polymer (PDo) in which 1˜8 moles of DOCA are grafted per mole of PEI.

Abstract: Disclosed is an esophageal stent placed in a stenosed part of the esophagus having a flexible tube to prevent the reverse flow of gastric contents from the stomach is coupled to the lower end of the esophageal stent. The flexible tube has an inside membrane and an outside membrane adhered to each other, thus having a twofold structure with at least one core longitudinally placed between the adhered inside and outside membranes while the core extends from the upper end toward the lower end of the flexible tube. Thus, the flexible tube is prevented from being inverted, and prevents the reverse flow of the gastric contents, and maximizes the operational reliability of the esophageal stent. The flexible tube does not cause a patient pain or discomfort due to frictional contact of the tube with the inner surface of the stomach when the tube moves in the stomach.