JP2019118789A - Improved stent with external channel - Google Patents

Abstract

To provide an improved stent with an external channel which achieves smooth flow of a body fluid secreted from a branched duct after implantation, which does not move from an initial implantation point, and which can be used for a relatively long term.SOLUTION: An improved stent 1 with an external stent comprises: a stent body 10 which can be expanded and shrunk, which is formed by wires having a prescribed length and flexibility crossing each other for forming a net body, and which comprises therein, a peripheral edge part with a hollow; and a cover 20 arranged to surround an outer peripheral face of the stent body 10. A body fluid secreted from a branched duct through a plurality of spiral external channels 11 being a separation space formed between the stent body 10 and the duct, is made to flow smoothly into the duct, and a contact area with the duct is relatively large, so that, by increase of friction, the stent does not move from the initial implantation point, and the stent can be used for a relatively long term.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a modified stent with an external flow path, and more particularly, the smooth flow of the fluid secreted from the branch conduit through the separated space formed between the stent body and the conduit after implantation. Improved with external flow path that can be used for a relatively long time without moving away from the initial implantation point due to the increase of friction force because the contact area with the conduit is relatively large though It relates to a stent.

  Generally, it is artificial in cases where stenosis occurs due to various causes such as deposits in a conduit that needs to secure a predetermined inner diameter, such as blood vessels in the human body, esophagus, pancreatic duct or fistula, or when the purpose is surgery Will insert a stent that can expand the stenosis site. The stent should have a smooth crimp and expansion of the periphery to facilitate insertion into the conduit.

  To this end, the stent is manufactured by crossing a plurality of wires with each other or by forming a plurality of holes on the surface by a laser pattern. Therefore, when the stent is placed at the stenosis site, a phenomenon occurs in which the pressure due to the expansion of the stent causes the tissue at the stenosis site to project inside the stent through the hole in the surface of the stent. In particular, when the stent is placed for a long time, or if the pressure due to the expansion of the stent is applied above a predetermined level, there is a side effect that the tissue at the stenosis site is destroyed or is killed. was there.

  Therefore, many methods have been taken to solve the problems described above. Among them, typically, a method of forming a coating to seal a hole on the surface of a stent is known. In the stent, a plurality of holes having a square shape on the surface are formed by crossing a plurality of wires. Also, in order to prevent the tissue at the installation site from protruding into the inside of the stent through the hole, the hole is entirely coated with silicon or the like to seal the hole. Through this, the stent can be stably fixed at the installation site and prevent tissue from protruding inside the stent.

  In addition, as a method of sealing the hole of the stent, after the stent is manufactured by dipping on liquid silicon or the like, or a film made of silicon or polyurethane is separately manufactured, the outer peripheral surface of the stent is surrounded. It is common practice to cover and secure both ends of the film to the stent using sutures.

  However, in the case of using the dipping process among the processes described above, silicon is applied to the entire area of the stent, so when applied to a bent part such as a digestive system, it returns to the initial state. Resilience to try is strong. That is, there has been a problem that the flexibility of the stent may be reduced to cause friction to the lesion to cause inflammation.

  In addition, methods using films have the added complication of having to undergo additional biological testing of the suture to permit not only stents, but also medical device products, and stenting films using sutures. There is a problem in that the steps of bonding and fixing are added to increase the manufacturing cost and manufacturing time of the stent.

  Furthermore, when the entire area of the stent is sealed using the dipping process described above or a method using a film, body fluid such as blood or pancreatic fluid can flow smoothly inside the stent, but intrahepatic There has been a problem that the fluid flowing into the conduit through a branch conduit such as a fistula duct or a gallbladder branch pancreatic duct is difficult to flow.

  In order to solve such problems, a technique for partially sealing the holes of the stent has been proposed, but there has been a problem that the tissue protrudes inside the stent at the hole site of the unsealed stent.

  In order to solve such a conventional problem, “a plurality of holes are formed on the surface, and a stent main body having a peripheral portion with a hollow formed therein and one side of the outer peripheral surface of the stent main body And the stent body is formed with an external flow passage that provides a flow path along which the body fluid secreted from the branch conduit can flow along the longitudinal direction of the stent body. The cover portion is coated to coat the film and the end portions on both sides of the stent body, deployed to surround one side of the outer peripheral surface of the stent body, and deployed to fix the film to the stent body A stent having a coating layer formed thereon, wherein the outer channel is formed with a recess on one side of the peripheral portion of the stent body, the recess being The body fluid is formed along the longitudinal direction of the tent body to allow the body fluid secreted from the branch conduit to flow through the recess, and the external flow path has a protrusion on one side of the peripheral edge of the stent body. The protrusion is formed along the longitudinal direction of the stent body and is secreted from the branch conduit along a separation space formed between the stent body and the conduit by the protrusion A plurality of external flow channels are provided, and the plurality of external flow channels are formed such that a recess and a protrusion are repeated along the peripheral edge of the stent body, and the recess and A protrusion is formed along the longitudinal direction of the stent body and is secreted from the branch conduit through a separation space formed between the stent body and the conduit due to the difference in diameter between the recess and the protrusion. And the stent body is formed such that at least one of the two end portions is expanded more than the central portion in order to prevent detachment, and the coating layer is the stent. A stent in which the ends of the film are formed at the ends on both sides of the body to a predetermined overlapping depth to cure the coating layer, and to fix the ends of the film to the stent body. It is disclosed in Korean Patent Registration No. 10-1628711.

  However, the conventional stent thus formed such that the recess and the protrusion are repeated along the peripheral portion is secreted from the branch conduit through the separation space formed between the stent body and the conduit. While the fluid flow is smooth, only a large number of protrusions are in close contact with the conduit, so the contact area is small and should be re-operated after a predetermined period of time to slide at the first implantation point There was a problem that it was impossible.

Republic of Korea Patent Registration No.10-1628711

  The present invention is intended to solve the problems as described above, and the flow of the fluid secreted from the branch conduit through the separated space formed between the stent body and the conduit after the implantation is smooth. However, since the contact area with the conduit is relatively large, the friction force is increased so that it does not move from the initial implantation point, and the improved stent with the external flow path can be used for a relatively long time The purpose is to provide.

  In order to achieve such an object, the present invention is capable of contraction and expansion by itself, wires of a predetermined length having flexibility cross each other to form a mesh, and hollow inside is A stent body having a formed peripheral portion and a cover portion deployed to surround an outer circumferential surface of the stent body, the stent body is disposed in the conduit and the body fluid secreted from the branch conduit is A plurality of external flow paths are provided outside the cover portion to provide a flowable path along the longitudinal direction of the stent body, but a recess and a protrusion are repeated along the peripheral portion of the stent body And an external flow passage through which the body fluid secreted from the branch conduit flows through a separation space formed between the stent body and the conduit due to the difference in diameter of the recess and the projection. In the stent, the outer flow passage of the stent body is characterized in that a large number of helical outer flow passages are formed along the peripheral edge of the stent body, the depressions and the protrusions having a helical shape in the longitudinal direction. .

  The shape of the stent body is characterized in that the front surface selectively uses any one of a pentagon, a hexagon, a heptagon, and an octagon.

  The spiral external flow path of the stent body is characterized in that it is rotated clockwise or counterclockwise around the circumference of the stent body by one to three revolutions.

  Thus, according to the present invention, although the flow of the fluid secreted from the branch conduit through the separation space formed between the stent body and the conduit after implantation is smooth, the contact area with the conduit is relatively high. Since the friction force is increased, the friction force is increased, so that there is an effect that it can be used for a relatively long time without moving from the initial implantation point.

  The present invention is not limited to the specific preferred embodiments described above, but it should be understood by those skilled in the art to which the present invention belongs without departing from the scope of the present invention claimed in the claims. Such modifications are, of course, within the scope of the appended claims, and it goes without saying that various modifications are possible.

It is a principal part enlarged perspective view which shows the mode of the improved stent with an external flow path which is embodiment of this invention. It is a front view which shows the mode of the front of the improved stent with an external flow path which is embodiment of this invention. It is the enlarged front view which expanded the appearance of the front of the improved stent with an external flow path which is an embodiment of the present invention. It is a right view which shows the mode of the right side of the improved stent with an external flow path which is an embodiment of the present invention. It is a top view which shows the mode of the plane of the improved stent with an external flow path which is embodiment of this invention. It is a principal part expanded sectional view which shows the mode of implantation of the improved stent with an external flow path which is embodiment of this invention.

  Hereinafter, the present invention will be described in more detail with reference to the attached drawings.

  For reference, in describing the present invention, when it is recognized that the detailed description of the related known functions or configurations may obscure the gist of the present invention, the detailed description will be omitted. did.

  Also, the terms to be described later are terms defined in consideration of the functions in the present invention, which differ depending on the intention or practice of the user or the operator.

  Therefore, it is needless to say that the definition should be made based on the contents throughout the present specification.

  FIG. 1 is an enlarged perspective view of an essential part of an improved stent with an outer flow passage according to an embodiment of the present invention, and FIG. 2 is an improved stent with an outer flow passage according to an embodiment of the present invention. 3 is an enlarged front view showing an enlarged front view of the improved stent with an outer flow passage according to an embodiment of the present invention. FIG. 4 is a front view showing the appearance of the front view of the present invention. FIG. 5 is a right side view showing the right side of the improved stent with the outer flow passage according to the embodiment, and FIG. 5 is a plan view of the improved stent with the outer flow passage according to the embodiment of the present invention. It is a top view.

  The improved stent with outer flow passage 1 of the present invention is capable of contraction and expansion by itself, wires of a predetermined length having flexibility cross each other to form a mesh, and hollow 12a is inside. It comprises a stent body 10 having a formed peripheral edge 12 and a cover portion 20 disposed so as to surround the outer peripheral surface of the stent body 10.

  The stent body 10 is capable of contracting and expanding by itself, and the flexible wires 13 and 13a having a predetermined length cross each other to form a mesh, and a hollow 12a is formed inside A spiral portion disposed in the conduit 30 to provide a flow path along which the body fluid secreted from the branch conduit 31 can flow along the longitudinal direction of the stent body 10 to the outside of the cover portion 20; A large number of external flow channels 11 are formed along the peripheral edge 12 of the stent body 10 so that helical depressions 11 a and helical projections 11 b are repeated in a helical shape in the longitudinal direction.

  As the cover portion 20, it is preferable to use any one of fabric, synthetic resin, rubber, silicone or polyurethane into a thin film generally used in the industry and then use, but dipping silicone or polyurethane is preferable. It goes without saying that coating can be performed by dipping (dipping), or coating liquid can be applied and formed.

  The cover portion 20 surrounds the outer peripheral surface of the stent main body 10, and by closing and sealing a large number of holes formed on the surface of the stent main body 10 with a mesh body, the tissue at the constriction site becomes the surface of the stent main body 10. It will prevent projecting or flowing into the inside of the stent body 10 through the hole.

  A large number of spirals, which are separation spaces formed between the stent body 10 and the conduit 30, due to the difference in diameter between the spiral recess 11a and the spiral projection 11b of the spiral external flow passage 11 of the stent body 10. The body fluid secreted from the branch conduit 31 through the external flow passage 11 flows smoothly into the conduit 30.

  It is needless to say that the shape of the stent main body 10 can selectively use any one of a pentagon, a hexagon, a heptagon and an octagon in a front view, as needed. .

  The shape of the stent main body 10 of the present invention is described as a hexagonal shape as an optimum embodiment in a front view.

  When the shape of the stent body 10 is a triangle or a square in a front view, the area in which the spiral protrusion 11 b of the spiral external flow passage 11 of the stent body 10 contacts the inner surface of the conduit 30 is small This is because there is a risk that it slips from the initial implantation position and flows or moves in the conduit 30.

  Further, in the front view, in the case of a shape having a heptagon or more, the branch conduit 31 formed between the spiral recess 11 a of the spiral external flow passage 11 of the stent body 10 and the inner side surface of the conduit 30. Because the size of the body fluid passage is too small, the flow of the fluid is not smooth and there is a risk of being closed.

  Preferably, the multiple spiral external flow channels 11 of the stent body 10 are rotated clockwise or counterclockwise around the circumference 12 of the stent body 10 in the form of a screw in one to three turns. .

  In the present invention, the helical external flow passage 11 of the stent main body 10 is described as an optimal embodiment as being formed by rotating twice in the shape of a screw along the peripheral edge 12 of the stent main body 10 in the clockwise direction. Do.

  When the spiral external flow passage 11 is twisted along the peripheral edge 12 of the stent body 10 in the shape of a screw for 4 or more rotations, the spiral recess 11 a of the spiral external flow passage 11 of the stent body 10 and the conduit This is because the flow of the body fluid of the branch conduit 31 formed between the inner surface of the body 30 and the inner side of the branch 30 is too far to flow smoothly and may be closed.

  Such a modified stent 1 with an outer flow passage of the present invention is formed with a plurality of spiral outer flow passages 11 twisted in the form of a screw for 4 or more rotations along the peripheral edge 12 of the stent body 10.

  At this time, the spiral external flow passage 11 may be formed so that various shapes are formed like a star shape while the above-described spiral recess 11 a and the spiral protrusion 11 b are repeatedly crossed.

  That is, the extra space between the stent body 10 and the inner surface of the conduit 30 generated due to the difference in diameter between the spiral recess 11a and the spiral protrusion 11b becomes the external flow path and the body fluid discharged from the branch conduit 31 is the conduit It flows into the inside of 30 and flows in the longitudinal direction of the conduit 30 through the spiral recess 11 a of the spiral external flow passage 11 spirally twisted in the longitudinal direction of the stent body 10.

  At this time, the spiral depressions 11a and the spiral projections 11b of the spiral external flow passage 11 may be repeatedly formed at equal intervals, or may be irregularly formed if necessary. It's too late.

  FIG. 6 is an enlarged fragmentary cross-sectional view showing how an improved stent with an external flow passage according to an embodiment of the present invention is implanted.

  In this manner, the spiral projection 11b of the spiral external flow passage 11 is implanted to be in close contact with the inner surface of the conduit 30, and the spiral recess 11a is separated from the inner surface of the conduit 30 by a predetermined distance. A spiral external flow passage 11 is formed.

  Thus, the improved stent 1 of the present invention having the spiral external flow passage 11 is secreted from the branch conduit 31 through the separation space formed between the stent body 10 and the conduit 30 after implantation. Although the flow of the body fluid is smooth, the contact area with the conduit 30 is relatively large, so the friction force is increased and does not move from the initial implantation point, whereby the treatment subject is relatively It is possible to use it for a longer time after implanting the improved stent 1.

  The scope of the present invention is disclosed by the following claims rather than the detailed description, and the scope of the present invention includes all changes or modifications derived from the meaning and scope of the claims and the equivalent concept. It should be interpreted as

Reference Signs List 1 improved stent 10 stent main body 11 spiral external flow passage 11a spiral recess 11b spiral protrusion 12 peripheral portion 12a hollow 13, 13a wire 20 cover portion 30 conduit 31 branch conduit

Claims (3)

A stent body and a stent body having a peripheral portion in which a predetermined length of wire having flexibility and capable of shrinking and expanding by itself crosses each other to form a mesh, and in which a hollow is formed. The stent body includes a cover portion disposed to surround the outer circumferential surface, wherein the stent body is disposed in the conduit and the body fluid secreted from the branch conduit is outside the cover portion along the longitudinal direction of the stent body. A plurality of external channels providing flowable paths are formed, and a recess and a protrusion are formed to be repeated along the peripheral edge of the stent body, and the diameter difference between the recess and the protrusion is formed. A stent having an external flow path through which the body fluid secreted from the branch conduit flows through a separation space formed between the stent body and the conduit by
The external flow path of the stent body is characterized in that a large number of spiral external flow paths are formed along the periphery of the stent main body, the depressions and the protrusions having a helical shape in the longitudinal direction. Modified stent.    The improved stent with an outer flow passage according to claim 1, wherein the shape of the stent body selectively uses any one of a pentagon, a hexagon, a heptagon and an octagonal shape in the front surface. .   The external flow according to claim 1, wherein the spiral external flow path of the stent body is rotated clockwise or counterclockwise around the circumference of the stent body by one to three revolutions. Roadside improved stent.

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