FR3001123A1 - STENT COMPRISING MEANS FOR PREVENTING MIGRATION, AND APPARATUS AND METHOD FOR MANUFACTURING THE SAME - Google Patents

Abstract

The present invention relates to a stent comprising means for preventing migration, which comprises: a hollow cylindrical body (110) made of a wire; first locking portions (120, 121, 122, 123) projecting outwardly from the body (110), and second locking portions (130, 131, 132) arranged at a distance from the first locking portions in the direction longitudinally of the body (110) in symmetry relation with the first blocking portions about the vertical surface with respect to the longitudinal direction of the body (110).

Description

TECHNICAL FIELD The present invention relates to a stent comprising means for preventing a migration, and an apparatus and a method for the manufacture thereof. PRIOR ART In general, if narrowed parts are formed in a cavity of the human body such as the throat, duodenum and the like, by cancerous tissue, the food passing through the cavity does not flow gently into it. . Recently, it has been envisaged to insert into the cavity an instrument for dilating the cavity, such as a stent, so as to widen the passages formed by the narrowed portions of the cavity, which allows food passing through the cavity to flow gently into it. On the other hand, a stent inserted into a digestive organ is migrated from its initial position of insertion due to the peristaltic movement of the digestive organ as time passes, which makes it difficult to ensure stability of the stent. In order to solve the above-mentioned problems, it has accordingly been proposed by Korean Patents Nos.10-1076716 and 10-0961466 solutions by which the position of the stent inserted into a cavity is stably maintained.

In accordance with conventional practices mentioned above, even if food enters the cavity, the position of the stent is held fixed, which prevents stent migration in the direction in which the food is moving. However, the stent can be moved in the opposite direction by means that are adapted to secure the stent to the cavity.

DESCRIPTION OF THE INVENTION TECHNICAL PROBLEM Accordingly, the present invention has been conceived in consideration of the above-mentioned problems that exist in the prior art, and an object of the present invention is to provide a stent comprising means for preventing migration, able to prevent migration after the stent has been inserted into a cavity.

Technical Solution To achieve the above object, according to a first aspect of the present invention, there is provided a stent comprising means for preventing migration comprising: a hollow cylindrical body made of a wire; first locking portions protruding outwardly from the body, and second locking portions arranged at a distance from the first locking portions in the longitudinal direction of the body, in a symmetrical relationship with the first locking parts around the vertical surface with respect to the longitudinal direction of the body.

According to the present invention, preferably, at least some of the first blocking portions and the second blocking portions are arranged to be plural. According to the present invention, preferably, at least some of the first locking portions and second locking portions are equidistant from one another along the outer peripheral surface of the body to form a row, and one or more rows are arranged on the along the longitudinal direction of the body. According to the present invention, preferably, the first locking portions and the second locking portions are arranged inclined with respect to the outer peripheral surface of the body. According to the present invention, preferably, at least some of the first locking portions and the second locking portions are arranged in extension from a portion of the metal wire forming the body, or are arranged protruding from the outer periphery of the stent. with a separate wire. To achieve the above object, according to a second aspect of the present invention, there is provided an apparatus for the manufacture of a stent comprising means for preventing migration, comprising: a support member, having a cylindrical body adapted in the manufacture of the stent, and one or more fixing holes or grooves on the outer peripheral surface of the body; support pins adapted to be inserted into the fixing holes or grooves for receiving the wire forming the stent, so that the wire is folded in a zigzag pattern on the surface of the support piece; and pins forming locking portions, each having an insertion hole formed therein, adapted to receive the corresponding support pin therein by insertion, and fixing grooves arranged along its peripheral surface. exterior. According to the present invention, preferably, the pins forming locking portions have larger inner diameters than the outer diameters of the support pins, so that the pins forming locking portions are connected to the support pins. According to the present invention, preferably, one or more attachment grooves are provided along the outer peripheral surface of each pin forming a locking portion, in the longitudinal direction of each pin forming a locking portion. According to the present invention, preferably, fixing pins and pins forming locking portions are arranged integrally with one another. To achieve the above object, according to a third aspect of the present invention, there is provided an apparatus for manufacturing a stent comprising means for preventing migration, comprising: a support member having a cylindrical body adapted for manufacturing the stent, and one or more fixing holes or grooves provided on the outer peripheral surface of the body, and fixing pins, adapted to be inserted into the fixing holes or grooves 20 so as to project from the surface outer periphery of the support piece, and having grooves arranged along the outside of their peripheral surface. To achieve the above object, according to a fourth aspect of the present invention, there is provided a method of manufacturing a stent comprising means for preventing migration, the method comprising the steps of: connecting the stent to a support member having a cylindrical body; inserting fastening pins into one or more mounting holes or grooves provided on the outer peripheral surface of the support member; providing on the support pins pins forming blocking portions, each of which has grooves arranged along its outer peripheral surface; connecting one wire to one side and the other side of the stent so that it protrudes outwardly of the stent, thereby forming first locking portions, and fixedly holding the first locking portions in the recessed grooves around the pins forming locking portions; and forming second locking portions symmetrically with the first locking portions about the vertical surface relative to the longitudinal direction of the stent. According to the present invention, preferably, at least some of the first locking portions and the second locking portions are arranged in extension from a portion of the metal wire forming the body, or are arranged protruding from the outer periphery of the stent. with a separate wire. Advantageous Effects According to the present invention, the first blocking portion and the second blocking portion are arranged in symmetrical relationship with each other on the outer peripheral surface of the stent body, such that after the stent has been inserted into the cavity, it can be positioned in it stably, without any migration in one direction or the other. Description of the drawings Fig. 1 is a perspective view showing a stent manufacturing apparatus including means for preventing migration according to the present invention. Figure 2 is a perspective view showing a pin forming a locking portion according to the present invention.

Fig. 3 is a perspective view showing a stent manufacturing procedure including means for preventing migration according to the present invention. Figures 4 to 6 are views showing the stent including means to prevent migration according to the present invention.

Fig. 7 is a block diagram showing the steps of a method of manufacturing the stent including means for preventing migration according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, there is provided a detailed description relating to a stent comprising means for preventing migration according to the present invention, with reference to the accompanying drawings. For the sake of brevity of this description, the technique well known in the prior art will not be explained in detail or will be explained briefly.

Embodiment of the Invention A stent 100 comprising migration preventing means according to the present invention essentially comprises a cylindrical body 110, first locking portions 120, 121, 122 and 123, and second locking portions 130, 131 and 132; it will be described with reference to Figures 1 to 6. The cylindrical body 110 has a hollow cylindrical shape and is made of a wire. In the present case, the wire is preferably made of a shape memory alloy having an elasticity, such as a nickel-titanium alloy. The first blocking portions 120, 121, 122 and 123 project outwardly from the body 110, and the second blocking portions 130, 131 and 132 are spaced apart from the first blocking portions 120, 121, 122 and 123 in the longitudinal direction of the body 110. The first locking portions 120, 121, 122 and 123 and the second locking portions 130, 131 and 132 are arranged inclined relative to the outer peripheral surface of the body 110, and the second parts 130, 131 and 132 are arranged in a symmetrical relationship with the first locking portions 120, 121, 122 and 123 about the vertical surface relative to the longitudinal direction of the body 110. At least some of the first blocking portions 120, 121, 122 and 123 and second locking portions 130, 131 and 132 are arranged so as to be plural, so as to be equidistant from each other along the perimeter surface. outer phérique of the body 110 to form a row, and one or more rows may be arranged along the longitudinal direction of the body 110. The wire to form the first blocking portions 120, 121, 122 and 123 and the second Locking portions 130, 131 and 132 are preferably of a shape memory alloy having an elasticity, such as a nickel-titanium alloy. The first blocking portions 120, 121, 122 and 123 and the second blocking portions 130, 131 and 132 are spaced from each other in the longitudinal direction of the body 110, so that when the stent 100 includes means preventing migration is inserted into a cavity, the interference between the first blocking portions 120, 121, 122 and 123, and the second blocking portions 130, 131 and 132 resulting from their elasticity can be reduced, so as to allow to maintain stable insertion position of the stent 100 in the cavity. In addition, the first blocking portions 120, 121, 122 and 123 and the second blocking portions 130, 131 and 132 extend in directions allowing an overlap of the body 110, so as to have a given angle with respect to the body. 110; according to the present invention, when the angles of first locking ends or second locking ends with respect to the body 110 are between 0 ° and 90 °, the position of insertion of the stent can be fixedly maintained. On the other hand, at least some of the first blocking portions 120, 121, 122 and 123 and the second blocking portions 130, 131 and 132 are expanded from a portion of the body wire 110, or are arranged protruding from the outer periphery of the body 110 with a separate wire. In addition, the stent 100 comprising migration preventing means according to the present invention comprises cover pieces 140 and 141. The cover piece 140 is formed of a hollow cylindrical part having a passage arranged inside it and is located inside the body 110 so as to be brought into contact with the body 110. In the exemplary embodiment, the cover pieces 140 and 141 are made of medical polyurethane, silicone-urethane copolymer, silicon, polyamide, polyester, fluorocarbon resin, or the like. In the present example, the cover 140 is positioned to be brought into contact with the entire surface of the body 110 or with a portion of the body 110. The cover piece 141, which consists of the same material as the body 110, is provided on the surfaces of the first blocking portions 120, 121, 122 and 123 or the second blocking portions 130, 131 and 132, and this cover piece 141, thus formed, protects the wall interior of the cavity against damage caused by the first blocking portions 120, 121, 122 and 123 or the second blocking portions 130, 131 and 132. An apparatus 200 for the manufacture of the stent 100 comprising means for preventing migration according to the invention. The present invention comprises a support member 210, support pins 220 and 221, and pins 230 forming locking portions. The support member 210 includes a cylindrical body adapted for stent fabrication and has at least one or more mounting holes or grooves 211 and 212 provided on its outer peripheral surface to receive the support pins 220 and 221.

The support pins 220 and 221 are inserted into the fixing holes or grooves 211 and 212 so as to be able to receive the wire forming the stent, so that the wire is folded in a zigzag pattern on the surface of the stent. the support piece 210.

As shown in FIG. 2, each pin 230 forming a locking portion comprises an insertion hole 233, arranged inside it to insertably receive one of the support pins 220 and 221 therein, and fixing grooves 231 and 232 provided along its outer peripheral surface. In the example shown, pin 230 forming a locking portion has a larger inner diameter than the outer diameters of support pins 220 and 221, so that the pins 230 forming locking portions can be connected to the locking pins. Support 220 and 221. One or more attachment grooves 231 and 232 are provided along the outer peripheral surface of the pin 230 forming a locking portion in the longitudinal direction of the pin 230 forming a locking portion. In other words, the support pins 220 and 221 are connected to the pins 230 forming insertion blocking portions therein, so that the assembly operations of the pins 230 forming locking portions to the support pins 220 and 221 secured to the fixing holes or grooves 211 and 212 of the support member 210 may be conveniently made. In addition, the fixing grooves 231 and 232 are arranged along the outer peripheral surface of each pin 230 forming a locking portion, so as to fix the first locking portions 120, 121, 122 and 123 and the second portions of blocking 130, 131 and 132 thereto, so that the angles of the first blocking portions 120, 121, 122 and 123 and the second blocking portions 130, 131 and 132 can be adjusted easily. According to another preferred embodiment of the present invention, a fixing pin (not shown) and a pin 230 forming a locking portion may be formed integrally with each other. According to yet another preferred embodiment of the present invention, a fastener pin (not shown) which is inserted into the fastener grooves 211 and 212 so as to project from the outer peripheral surface of the support member 210. , has a groove arranged along its outer peripheral surface, which allows it to serve as a pin 230 forming a locking portion for adjusting the angles of the first locking portions 120, 121, 122 and 123 and the second locking portions 130, 131 and 132. Method of manufacturing the stent comprising means for preventing migration according to the present invention A stent manufacturing method 100 comprising means for preventing migration according to the present invention is explained hereinafter with reference to FIG. 7; for convenience of description, the manufacturing method will be described with the following steps. 1. Stent Bonding Step (S501) In this step, the stent is connected to the support piece 210 whose body is cylindrical. Prior to this step, a step of manufacturing the stent is carried out, during which a wire is wound on the support pins 220 and 221 of the support piece 210 and is arranged in a zigzag pattern in the circumferential direction. of the support member 210, to form the body 110 of the stent 100. 2. Insertion step of the attachment pins (S502) The attachment pins are inserted into one or more of the fixing holes or grooves 211 and 212 arranged on the outer peripheral surface of the support piece 210 which has been connected to the stent in step (S502). At this stage, the position of insertion of the fixing pins can be modified according to the positions of the first blocking parts 120, 121, 122 and 123 or the second blocking parts 130, 131 and 132. 3. Installation step pins forming locking portions (S503) The pins 230 forming locking portions, having grooves arranged along their outer peripheral surfaces, are connected to the fastening pins inserted into the fastening grooves 211 and 212 at step (S502). 4. Stage of Arrangement of the First Blocking Parts (S504) In this stage, as illustrated in FIG. 3, the wire is connected to one side and to the other side of the stent fixed to the support piece 210 of FIG. in order to protrude outwardly from the stent, thereby forming the first locking portions 120, 121, 122 and 123; the first locking parts are then locked in a fixed manner in the grooves arranged around the pins 230 forming locking portions.

In this case, the first blocking portions 120, 121, 122 and 123 are formed from a portion of the wire forming the stent, or are arranged protruding from the outer periphery of the stent with a separate wire. 5. Stage of Arrangement of the Second Blocking Parts (S505) In this stage, the second blocking parts 130, 131 and 132 are arranged symmetrically with respect to the first blocking parts 120, 121, 122 and 123 around the vertical surface relative to the longitudinal direction of the stent. In other words, the support pins 220 and 221 are connected to the fixing holes or grooves 211 and 212 which are in a symmetrical relationship with respect to the first blocking portions 120, 121, 122 and 123 made in step (S502) , and the pins 230 forming locking portions are assembled to the support pins 220 and 221 of the step (S503), so that at this step (S505), the second locking portions 130, 131 and 132 are arranged in the same manner as the first blocking portions 120, 121, 122 and 123 in step (S504), while having, between the top and the bottom, a symmetry relation with respect to the first blocking portions 120, 121 , 122 and 123. In this case, the second blocking portions 130, 131 and 132 are expanded from a portion of the wire forming the stent, or are projecting from the outer periphery of the stent with a wire. separate metal. 6. Stage of Layout of the Cover Part (S506) In this step, the stent 100 comprising migration preventing means is immersed in a coating solution to form the cover pieces 140 and 141, or, alternatively, the coating solution is applied to a surface of the stent by spraying so as to form the cover pieces 140 and 141. Then, the cover pieces 140 and 141 are cured in an ultraviolet oven. Although the present invention has been described with reference to particular embodiments, it should not be limited to these embodiments but only by the appended claims. It should be noted that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.

Claims (12)

REVENDICATIONS1. Stent comprising means adapted to prevent migration, characterized in that it comprises: a hollow cylindrical body (110) made of a metal wire; first locking portions (120, 121, 122, 123) protruding outwardly from the body, and second locking portions (130, 131, 132) spaced apart from the first locking portions in the direction longitudinally of the body (110) in a symmetrical relationship with the first blocking portions (120, 121, 122, 123) about the vertical surface with respect to the longitudinal direction of the body. Stent comprising means for preventing a migration according to claim 1, characterized in that at least some of the first locking portions (120, 121, 122, 123) and second locking portions (130, 131, 132 ) are arranged so as to be plural. Stent comprising means for preventing a migration according to claim 2, characterized in that at least some of the first locking portions (120, 121, 122, 123) and second locking portions (130, 131, 132 ) are equidistant from each other along the outer circumferential surface of the body (110) so as to form a row, and in that one or more rows are arranged along the longitudinal direction of the body (110). 4. Stent comprising means adapted to prevent a migration according to claim 3, characterized in that the first locking portions (120, 121, 122, 123) and the second locking portions (130, 131, 132) are arranged inclined relative to the outer peripheral surface of the body (110). 5. Stent comprising means for preventing a migration according to claim 4, characterized in that at least some of the first locking portions (120, 121, 122, 123) and second locking portions (130, 131, 132 ) are arranged in extension from a portion of the wire forming the stent, or are arranged protruding from the outer periphery of the body (110) with a separate wire. 6. A manufacturing apparatus specially adapted for the manufacture of a stent according to any one of claims 1 to 5, characterized in that it comprises: a support piece (210), having a cylindrical body adapted for the manufacture of the stent and one or more fixing holes or grooves (211, 212) provided on the outer peripheral surface of the body; support pins (220, 221) adapted to be inserted into the fixing holes or grooves (211, 212) for receiving the wire forming the stent, so that the wire is folded in a zigzag pattern on the surface of the support member (210), and pins (230) forming locking portions, each comprising an insertion hole (233) arranged therein, adapted to receive the support pin therein (220, 221) by insertion, and fixing grooves (231, 232) arranged along its outer peripheral surface. A stent-making apparatus comprising means for preventing migration according to claim 6, characterized in that the pins (230) forming locking portions have larger inner diameters than the outer diameters of the support pins. (220, 221), so that the pins (230) forming locking portions are connected to the support pins (220, 221). A stent manufacturing apparatus comprising means for preventing migration according to claim 7, characterized in that one or more attachment grooves (231, 232) are formed along the outer peripheral surface of each spindle. (230) forming a locking portion in the longitudinal direction of each pin (230) forming a locking portion. A stent manufacturing apparatus comprising means for preventing migration according to claim 6, characterized in that support spindles (220, 221) and locking pins (230) are formed in one piece from one another. with each other. An apparatus for manufacturing a stent comprising means for preventing migration, according to any one of claims 1 to 5, characterized in that it comprises: a support piece (210) having a cylindrical body (110) ) adapted for the manufacture of the stent, and one or more fixing holes or grooves (211, 212) provided on the outer peripheral surface of the body (110), and fixing pins, adapted to be inserted into the holes or grooves of fixing (211, 212) so as to project from the outer peripheral surface of the support member (210), and having grooves arranged along their outer peripheral surfaces. 11. A method of manufacturing a stent comprising means for preventing migration, characterized in that the method comprises the steps of: connecting the stent to a support member (210) having a cylindrical body (110); inserting fastening pins (220, 221) in one or more mounting holes or grooves (211, 212) provided on the outer peripheral surface of the support member (210); positioning on the support pins (220, 221) pins (230) forming locking portions, each of which has mounting grooves (231, 232) provided along its outer peripheral surface; connecting a wire to one side and the other side of the stent so that it protrudes outwardly of the stent, thereby forming first locking portions (120, 121, 122, 123), and sustainably secures the first blocking portions (120, 121, 122, 123) in the grooves (231, 232) arranged around the locking member pins (230), and forming second blocking portions (130, ¶31, 132) symmetrically with the first blocking portions (120, 121, 122, 123) about the vertical surface with respect to the longitudinal direction of the stent. A method of manufacturing a stent comprising means for preventing migration according to claim 11, characterized in that at least some of the first blocking portions (120, 121, 122, 123) and second blocking portions (130, 131, 132) are expanded from a portion of the stent wire, or are protruded from the outer periphery of the body (110) with a separate wire.