WO2022191209A1 - カテーテル及び搬送システム - Google Patents
カテーテル及び搬送システム Download PDFInfo
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- WO2022191209A1 WO2022191209A1 PCT/JP2022/010099 JP2022010099W WO2022191209A1 WO 2022191209 A1 WO2022191209 A1 WO 2022191209A1 JP 2022010099 W JP2022010099 W JP 2022010099W WO 2022191209 A1 WO2022191209 A1 WO 2022191209A1
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- WIPO (PCT)
- Prior art keywords
- stent
- sheath
- axial direction
- guide
- indwelling device
- Prior art date
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Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2/962—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve
- A61F2/966—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
Definitions
- the present invention relates to catheters and delivery systems.
- a tubular indwelling device (generally called a "stent") that maintains the patency of the artery is known (see, for example, Patent Document 1).
- a tubular indwelling device is delivered to the indwelling target site using a catheter.
- the tubular indwelling device is attached to the shaft member of the catheter in a radially contracted state and housed in the sheath.
- the outer surface of the tubular indwelling device will come into contact with the inner surface of the sheath and the tubular indwelling device will be displaced in the axial direction with respect to the shaft-like member.
- the catheter may be bent, and the tubular indwelling device may be displaced in the axial direction of the shaft-like member.
- the shape will be deformed. As a result, it becomes difficult to accurately place the tubular indwelling device at the target site of placement in the body lumen.
- An object of the present invention is to provide a catheter and delivery system capable of accurately indwelling a tubular indwelling device at a target site of indwelling in a biological lumen.
- the catheter according to the present invention is A catheter for carrying a tubular indwelling device to be indwelled in a biological lumen, a sheath; a long shaft-shaped member configured to be axially movable within the sheath; conversion means capable of maintaining at least a portion of the tubular indwelling device in the axial direction in a contracted state while the tubular indwelling device is released from the sheath, and capable of converting the portion from the contracted state to the expanded state;
- the shaft-shaped member is provided with a holding portion that holds the converting means, The holding part is formed so as to be able to position the contracted tubular indwelling device in the axial direction of the shaft-shaped member.
- a transport system includes: a tubular indwelling device to be indwelled in a biological lumen; a catheter for delivering the tubular indwelling device into the biological lumen,
- the catheter is a sheath; a long shaft-shaped member configured to be axially movable within the sheath; conversion means capable of maintaining at least a portion of the tubular indwelling device in the axial direction in a contracted state while the tubular indwelling device is released from the sheath, and capable of converting the portion from the contracted state to the expanded state;
- the shaft-shaped member is provided with a holding portion that holds the converting means, The holding part is formed so as to be able to position the contracted tubular indwelling device in the axial direction of the shaft-shaped member.
- a tubular indwelling device can be accurately indwelled at the indwelling target site of the biological lumen.
- FIGS. 1A and 1B are diagrams showing the configuration of the transport system.
- FIG. 2 is a schematic diagram showing an example of conversion means.
- 3A and 3B are schematic diagrams showing the portion of the delivery system to which the colonic stent is attached.
- FIG. 4 is a schematic diagram showing an example of a guide rib.
- 5A to 5C are schematic diagrams showing an example of state changes during placement of a colonic stent.
- 6A and 6B are schematic diagrams showing examples of guide ribs.
- 7A to 7C are cross-sectional views schematically showing other examples of guide ribs.
- a tubular indwelling device is used to treat obstruction (stenosis) by radially expanding a lesion L in the large intestine C (for example, an obstructed or narrowed portion of the large intestine).
- the catheter 1 and delivery system 100 for indwelling the colonic stent 2 in the colon C will be described.
- a delivery device for indwelling the colonic stent 2 at the placement target site is referred to as "catheter 1”
- a system in which the catheter 1 is loaded with the colonic stent 2 is referred to as "delivery system 100".
- FIGS. 1A and 1B are diagrams showing the configuration of the transport system 100.
- FIG. FIG. 1A shows the transport system 100 assembled
- FIG. 1B shows the transport system 100 disassembled.
- 1A and 1B schematically show the size (length, diameter, etc.) and shape of each member constituting the transport system 100 in order to facilitate understanding of the invention.
- the left side in FIGS. 1A and 1B is the distal side S1
- the right side is the proximal side S2.
- the delivery system 100 is used endoscopically, for example, by inserting it into a forceps hole of an endoscope when the colonic stent 2 is left in the large intestine.
- delivery system 100 comprises catheter 1 and colonic stent 2 .
- the colonic stent 2 has a tubular shape that defines a tubular channel through which the digestate flows.
- the colonic stent 2 is, for example, a bare stent composed only of a skeleton.
- the skeleton is a reinforcing member for maintaining the expanded state of the colonic stent 2, and is self-expandable from an inwardly contracted state to an outwardly expanded state in a radial direction substantially perpendicular to the axial direction. be done.
- the skeleton is formed, for example, by weaving wires into a tubular shape.
- the skeleton is composed of, for example, two wire rods that extend spirally while being folded back in a zigzag shape (Z shape) at a predetermined pitch, with a bent portion (one peak portion (a portion convex toward one end in the axial direction) and the other wire rod). troughs (portions protruding toward the other end in the axial direction)) are woven into a rhombus wire net shape (fence shape) so as to mesh with each other.
- the bent portions of the wires forming the mesh intersect each other closely, so that the extension in the axial direction is restricted.
- the skeleton is not limited to the above-mentioned skeleton structure. It may be composed of a helical skeleton that is spirally wound while being bent in a zigzag shape (Z shape). Alternatively, the skeleton may be formed by subjecting a metallic cylindrical member to laser processing. Furthermore, a plurality of wires may be used to form the skeleton.
- Examples of materials that form the skeleton include known metals or metal alloys typified by stainless steel, nickel-titanium alloys (nitinol), titanium alloys, and the like. Alternatively, an alloy material having X-ray contrast properties may be used. In this case, the position of the colonic stent 2 can be confirmed from outside the body.
- the skeleton may be formed of a material other than a metal material (for example, ceramic, resin, or the like).
- the shape (the number of ridges and the shape of the ridges), the distance between the wires in the axial direction (the amount of skeleton per unit length), etc. are determined, for example, by the sheath required for the colonic stent 2 depending on the placement site.
- the material is appropriately selected based on properties such as properties, releasability from the sheath, indwelling properties (corresponding to expansion force), and flexibility (ease of bending).
- the catheter 1 includes a sheath 11, an inner tube 12, a first operating portion 13, a second operating portion 14, a distal tip 15, conversion means 20, guide ribs 30, and the like.
- the sheath 11 is, for example, a tubular member made of flexible material.
- the inner tube 12 is, for example, a long shaft-like member made of a material having appropriate hardness and flexibility, such as resin or metal.
- Proximal sides S2 of the sheath 11 and the inner tube 12 are connected to the first operating section 13 and the second operating section 14, respectively.
- a distal tip 15 is arranged at the distal end of the inner tube 12 .
- the inner tube 12 is inserted inside the sheath 11 and arranged to extend to the distal side S1 of the sheath 11 .
- the sheath 11 and the inner tube 12 are configured to be relatively movable in the axial direction of the sheath 11 by operating the first operating section 13 and the second operating section 14 .
- the inner tube 12 and the distal tip 15 have, for example, a lumen for passing a guide wire, and a passage for converting means 20 for expanding the contracted colonic stent 2 at the affected area.
- a lumen or the like may be formed along the axial direction.
- the colonic stent 2 is attached to the end of the inner tube 12 on the distal side S1, and accommodated within the sheath 11 in a contracted state that is radially expandable. Specifically, the colonic stent 2 is contracted by being folded in the radial direction while being stretched in the axial direction, and is housed in the sheath 11 . At this time, the colonic stent 2 is held in a contracted state by the converting means 20 .
- the conversion means 20 When the colonic stent 2 is released from the sheath 11, the conversion means 20 maintains at least a portion of the colonic stent 2 in the axial direction (for example, the first stent portion 2A, etc.) in a contracted state and a portion of the colonic stent 2 from the contracted state. It has a configuration that can be converted to an extended state.
- An example of conversion means 20 is shown in FIG.
- the converting means 20 is composed of a restraining string 21 and a holding wire 22 which are linear members. Note that a configuration other than the linear member may be applied to the conversion means 20 .
- the conversion means 20 is composed of a restraining string 21 wound around the outer peripheral surface of the colonic stent 2 and a holding wire 22 engaged with the restraining string 21 .
- the converting means 20 are attached to the colonic stent 2 on the inner tube 12, for example, so as to contract the colonic stent 2 in its radial direction.
- the restraining string 21 and the holding wire 22 are formed of, for example, a material having a predetermined strength and rigidity, such as a suture thread such as nylon fiber or fluorine fiber, a nickel-titanium alloy or stainless steel thin metal wire, or a resin string. A shaped member can be applied. Note that the restraining string 21 and the holding wire 22 are preferably made of different materials in order to improve slipperiness when pulled out.
- the colonic stent 2 is held in a contracted state by the distal side S1 portion of the restraining string 21 and the holding wire 22 .
- the ends of the proximal side S2 of the restraining string 21 and the holding wire 22 are respectively pulled out from one branch port 143a of the Y connector 143 of the second operating section 14, and connected to the pulling operating sections 141 and 142. ing.
- the pull-out operating portions 141 and 142 By pulling the pull-out operating portions 141 and 142 in a predetermined direction (for example, the upper right direction in FIG. 1A), the restraining cord 21 and the holding wire 22 can be pulled out.
- a dial (not shown) may be provided on the second operation portion 14, and the holding wire 22 may be pulled out while performing fine adjustment by turning the dial.
- the restraining string 21 is wound in the circumferential direction around the outer peripheral surface of a portion of the colonic stent 2 (for example, the first stent portion 2A, etc.), bent for each rotation, and wound in the opposite direction.
- the retaining wire 22 is arranged along the axial direction of the colonic stent 2 and engaged with the bent portion B formed in the restraining string 21 . That is, the restraining cord 21 is wound in such a manner that it cannot retain the wound state by itself, and is retained by engaging with the retaining wire 22 so as not to fall off.
- the restraining string 21 and the retaining wire 22 are disengaged, the restraining string 21 naturally falls off from the colonic stent 2 . As a result, part of the colonic stent 2 is released from the contracted state and transitions to the expanded state.
- First to third converting means 20A to 20C are provided corresponding to first to third stent portions 2A to 2C, which divide the colorectal stent 2 into three sections in the axial direction (see FIGS. 3A and 3B). ).
- the first stent portion 2A is the portion located on the most distal side S1
- the third stent portion 2C is the portion located on the most proximal side S2
- the second stent portion 2B is the portion between the first stent portion 2A and the second stent portion 2B. It is the part in between. As shown in FIGS.
- the first to third conversion means 20A to 20C have first to third restraint cords 21A to 21C and first to third holding wires 22A to 22C, respectively. Note that the first to third holding wires 22A to 22C are omitted in FIG. 3B.
- the first to third conversion means 20A to 20C are configured to be independently operable, and among the first stent portion 2A to the third stent portion 2C of the colonic stent 2, the stent portion to be expanded (for example, , first stent portion 2A, etc.) can be flexibly controlled while confirming the indwelling state and the like.
- the guide ribs 30 are arranged on the outer peripheral surface of the stent mounting portion, which is the end of the inner tube 12 on the distal side S1.
- the guide ribs 30 are fixed to the inner tube 12 by, for example, adhesion or welding.
- the guide ribs 30 are formed so as to be able to position the contracted colonic stent 2 in the axial direction of the inner tube 12 .
- the skeleton of the colonic stent 2 is hooked on the end face of the guide rib 30, so that the inner tube 12 can be positioned in the axial direction. In conjunction with 12, the colonic stent 2 can be moved.
- the skeleton of the contracted colonic stent 2 is hooked on the end face of the guide rib 30, so that the colonic stent 2 is not displaced in the axial direction with respect to the inner tube 12. 2 can be extended.
- the guide rib 30 has a tube fixing portion 30a and an engaging portion 30b.
- the guide ribs 30 are formed, for example, by welding four cylindrical members.
- the three engaging portions 30b are arranged at, for example, 90° intervals on the peripheral surface of the tube fixing portion 30a.
- the tube fixing portion 30a has, for example, a cylindrical shape.
- the inner tube 12 is inserted through the through hole 30c provided in the tube fixing portion 30a.
- the through hole 30c functions as an attachment portion to which the inner tube 12 is attached (hereinafter referred to as "attachment portion 30c").
- the engaging portion 30b has a shape that can be engaged with the colonic stent 2 in the contracted state.
- the engaging portion 30b has, for example, a cylindrical shape like the tube fixing portion 30a.
- the converting means 20 is inserted through the through hole 30d provided in the engaging portion 30b.
- the through-hole 30d functions as a guide portion through which the converting means 20 (restraint cord 21 and holding wire 22) is inserted to hold the converting means 20 (hereinafter referred to as "guide portion 30d").
- the size (outer diameter, length) and shape of the tube fixing portion 30a and the engaging portion 30b are the same, but they may be different.
- the maximum outer diameter of the guide ribs 30 that is, the outer diameter of the circle circumscribing the guide ribs 30 is set to be smaller than the inner diameter of the sheath 11 even when the colonic stent 2 is placed on the circumferential surface of the guide ribs 30 .
- the shape of the guide ribs 30 is an example and is not limited to this, and can be changed arbitrarily as appropriate.
- the guide rib may be formed of a triple-lumen tube with a molded part, and the conversion means 20 may be inserted through a plurality of lumens, or may be shaped like a rib, and the conversion means 20 may be inserted through the projected portion.
- a guide portion 30d may be formed (see FIGS. 7A-7C).
- the guide rib 30 shown in FIG. 4 is provided with three guide portions 30d, and the first to third conversion means 20A to 20C can be individually inserted through the guide portions 30d to be guided. As a result, it is possible to prevent the first to third conversion means 20A to 20C from being entangled with each other, and to reduce the resistance when they are pulled out. Therefore, among the first to third holding wires 22A to 22C, only the desired holding wire (for example, the first holding wire 22A, etc.) can be smoothly pulled out. Further, only the desired restraining cord (for example, the first restraining cord 21A) can be smoothly pulled out of the first to third restraining cords 21A to 21C.
- the engaging portion 30b is provided so as to protrude from the tube fixing portion 30a, and can be engaged with the colonic stent 2 when attaching the stent.
- the colonic stent 2 is indwelled, particularly, for example, when the colonic stent 2 is released from the sheath 11, the engagement state between the engaging portion 30b and the colonic stent 2 is maintained.
- the large intestine stent 2 becomes difficult to shift.
- the guide rib 30 has a cross-sectional shape that partially protrudes radially outward. That is, the mounting portion 30c is provided eccentrically with respect to the circumscribed circle of the guide rib 30 in a cross section perpendicular to the axial direction. As a result, the effect on the filling rate in the sheath 11 is reduced, and the releasability of the colorectal stent 2 from the sheath 11 is improved.
- the catheter 1 has first to fourth guide ribs 31 to 34 as the guide ribs 30 .
- the first to fourth guide ribs 31 to 34 are arranged along the axial direction of the inner tube 12 so as to be axially separated from the distal side S1 (see FIGS. 3A and 3B).
- the first stent portion 2A of the colonic stent 2 is positioned between the first and second guide ribs 31, 32
- the second stent portion 2B is positioned between the second and third guide ribs 32, 33
- the third and third guide ribs 32, 33 are positioned between the second stent portion 2B.
- the third stent portion 2C is positioned between the four guide ribs 33,34.
- the first conversion means 20A is inserted through the fourth guide rib 34, the third guide rib 33, and the second guide rib 32 in this order from the proximal side S2.
- the first holding wire 22A of the first converting means 20A is passed through the second guide ribs 32, then pulled out of the colonic stent 2 and arranged along the first stent portion 2A.
- the first restraint string 21A is also passed through the first guide rib 31, folded back, and then wound around the outer peripheral surface of the first stent portion 2A from the distal side S1 toward the proximal side S2.
- the first restraining string 21A does not necessarily have to be inserted through the first guide ribs 31, and the first guide ribs 31 may have only the function of engaging with the colonic stent 2.
- the second conversion means 20B is inserted through the fourth guide rib 34 and the third guide rib 33 in this order from the proximal side S2.
- the second holding wire 22B of the second conversion means 20B is passed through the third guide rib 33, then pulled out of the colonic stent 2 and arranged along the second stent portion 2B.
- the second restraining string 21B is pulled out of the colonic stent 2 after being passed through the third guide rib 33, and extends from the proximal side S2 to the distal side S1 toward the second stent portion. It is wound around the outer peripheral surface of 2B.
- the third converting means 20C is inserted only through the fourth guide rib 34 on the most proximal side S2.
- the third holding wire 22C of the third converting means 20C is pulled out of the colonic stent 2 after passing through the fourth guide rib 34 and arranged along the third stent portion 2C.
- the third restraining string 21C is pulled out of the colonic stent 2 after being passed through the fourth guide rib 34, and extends from the proximal side S2 toward the distal side S1 to extend the third stent portion. It is wound around the outer peripheral surface of 2C.
- the third conversion means 20C does not necessarily have to be inserted through the fourth guide ribs 34, and the first and second conversion means 20A and 20B are inserted through the fourth guide ribs 34, and the inner tube 12 and the inner tube 12, which will be described later. Only the function of suppressing bending of the catheter 1 may be provided.
- first to third conversion means 20A-20C are provided corresponding to the second to fourth guide ribs 32-34.
- the first to third conversion means 20A to 20C that have passed through the second to fourth guide ribs 32 to 34 should be appropriately drawn out of the colon stent 2 and restrained by the first to third conversion means 20A to 20C.
- the first stent portion 2A to the third stent portion 2C can be distinguished and constrained easily.
- the first to third holding wires 22A to 22C can be pulled out along the axial direction of the inner tube 12, causing the inner tube 12 and the catheter 1 to flex. can be suppressed.
- the first to fourth guide ribs 31 to 34 may be made of members having the same shape and material. , are preferably provided according to the number of the first to third conversion means 20A to 20C passing through the guide rib 30. As shown in FIG. That is, for example, the fourth guide rib 34 is provided with three guide portions 30d corresponding to the first to third conversion means 20A to 20C, and the third guide rib 33 is provided to correspond to the first and second conversion means 20A and 20B.
- the second guide rib 32 may be provided with one guide portion 30d corresponding to the first converting means 20A.
- the number of guide ribs 30 may be made larger than the number of conversion means 20 so that the interval between the guide ribs 30 is narrowed. This makes it difficult for the holding wire 22 to separate from the inner tube 12 when the holding wire 22 is pulled out, thereby preventing the holding wire 22 from rubbing against and damaging the indwelling site.
- the end face where the first restraining cord 21A is folded back is preferably chamfered.
- the first guide rib 31 may have a structure capable of accommodating the surplus first restraining cord 21A.
- the first guide rib 31 on the most distal side S1 does not necessarily need to be arranged, and the first restraint string 21A is pulled out of the colon stent 2 after being passed through the second guide rib 32, and is pulled out to the proximal side. It may be wrapped around the outer peripheral surface of the first stent portion 2A from S2 towards the distal side S1.
- the guide portion 30d may be a bottomed hole for holding the tip of the holding wire 22 instead of the through hole.
- the guide ribs 30 are formed, for example, by injection molding in which molten resin is injected into a mold and cooled and solidified. Further, for example, the guide ribs 30 may be formed by extrusion or cutting of metal parts, or by three-dimensional modeling. In addition, the raw material resin may contain a material that enhances contrastability.
- FIG. 5A to 5C are diagrams showing state changes during placement of the colonic stent 2.
- FIG. 5A to 5C schematically show the colonic stent 2, and the detailed configuration of the first to third converting means 20A to 20C is omitted.
- the distal side S1 is the "mouth side”
- the proximal side S2 is the "anal side”.
- the colonic stent 2 is expanded and indwelled sequentially from the third stent portion 2C on the proximal side S2.
- the sheath 11 and the inner tube 12 are inserted from the anal side along a guide wire (not shown) previously introduced into the large intestine C. , the colonic stent 2 is positioned at the lesion site L (see FIG. 5A).
- the sheath 11 is moved to the proximal side S2 (anal side) to release the colonic stent 2 from the sheath 11 (see FIG. 5B).
- the colonic stent 2 is restrained by the first to third conversion means 20A to 20C held by the guide ribs 30 (first to fourth guide ribs 31 to 34) and maintained in the contracted state.
- the colonic stent 2 is released from the sheath 11 in a state in which its displacement in the axial direction with respect to the inner tube 12 is restricted by the guide ribs 30 (first to fourth guide ribs 31 to 34).
- the colonic stent 2 may be released from the sheath 11 by moving the inner tube 12 so as to push it toward the mouth while the position of the sheath 11 is fixed.
- the entire colonic stent when the entire colonic stent is expanded as it is released from the sheath, it is positioned by the expansion force of the colonic stent, making it difficult to adjust the indwelling position.
- the colorectal stent when the colorectal stent is expanded from the distal side S1 to the proximal side S2, the indwelling state can be confirmed endoscopically, so it is difficult to adjust the indwelling position during the indwelling. be.
- the colonic stent 2 since the colonic stent 2 does not expand when released from the sheath 11, the position of the proximal side S2 is endoscopically confirmed in the state shown in FIG. 5B.
- the indwelling position of the colonic stent 2 can be adjusted, and the colonic stent 2 can be easily indwelled at an appropriate position. Also, the colonic stent 2 can be rehoused within the sheath 11 .
- the third holding wire 22C is withdrawn to release the restraint of the third stent portion 2C of the colonic stent 2 by the third conversion means 20C, release.
- the first stent portion 2A and the second stent portion 2B are maintained in a contracted state by the first and second conversion means 20A, 20B.
- the third restraint cord 21C is appropriately pulled out and collected.
- first stent portion 2A and the second stent portion 2B of the colonic stent 2 are released and expanded, and the colonic stent 2 is appropriately retained at the target retention position.
- the catheter 1 is a catheter 1 for carrying the colonic stent 2 (tubular indwelling device) to be indwelled in the large intestine C (biological lumen), and includes the sheath 11 and the sheath
- An inner tube 12 (a shaft-like member) configured to be axially movable within 11 and at least a portion of the colonic stent 2 in the axial direction (for example, a first stent portion) in a state in which the colonic stent 2 is released from the sheath 11. 2A, etc.) in the contracted state and a conversion means 20 capable of converting a portion thereof from the contracted state to the expanded state.
- the inner tube 12 is provided with a guide rib 30 (holding portion) for holding the converting means 20 , and the guide rib 30 is formed so as to be able to position the colonic stent 2 in the contracted state in the axial direction of the inner tube 12 .
- the guide ribs 30 properly hold the conversion means 20 and axially position the at least partially contracted colonic stent 2 relative to the inner tube 12 . can be performed, and the colonic stent 2 can be properly delivered. Then, the colorectal stent 2 can be partially and appropriately expanded in the axial direction in various manners according to the introduction direction of the catheter 1, the indwelling site, and the like. At this time, for example, the holding wire 22 as the converting means 20 can be pulled out along the inner tube 12 by the guide ribs 30, so that the inner tube 12 and the catheter 1 can be prevented from bending. As a result, the colonic stent 2 can be placed in the colon C at the placement target site with high accuracy.
- a plurality of guide ribs 30 (holding portions) are provided spaced apart in the axial direction of the inner tube 12 (shaft-shaped member), and the conversion means 20 (first to third conversion means 20A to 20C) are:
- a plurality of guide ribs 30 (second to fourth guide ribs 32 to 34) are provided correspondingly.
- the plurality of guide ribs 30 allow the colonic stent 2 to be positioned more appropriately in the axial direction with respect to the inner tube 12 .
- the guide rib 30 (holding portion) has an engaging portion 30b that can be engaged with the contracted colonic stent 2 (tubular indwelling device).
- the engaging portion 30b and the colonic stent 2 are engaged with each other. Axial positioning of the at least partially contracted colonic stent 2 relative to the inner tube 12 is facilitated.
- the conversion means 20 has a restraining string 21 and a holding wire 22 (at least one linear member), and the guide rib 30 (holding portion) is an attachment to which the inner tube 12 (shaft-like member) is attached. It has a portion 30c and a guide portion 30d through which the restraining string 21 and the holding wire 22 are inserted.
- a portion of the colonic stent 2 can be converted from the contracted state to the expanded state by a simple operation of pulling out the restraining string 21 and the holding wire 22 .
- the mounting portion 30c is provided eccentrically with respect to the circumscribed circle of the guide rib 30 in a cross section perpendicular to the axial direction.
- the guide portion 30d is provided in the engaging portion 30b.
- the engaging portion 30b is configured so that the restraining string 21 and the holding wire 22 can be inserted therethrough.
- the guide rib 30 and the colonic stent 2 can be engaged with each other using the engaging portion 30b. 30 can be simplified.
- the structure of the guide ribs 30 shown in the embodiment is an example, and is not limited to this.
- a plurality of conversion means 20 may be inserted through one guide portion 30d, or as shown in FIG.
- the means 20 may be inserted and one through-hole may be shared by the mounting portion 30c and the guide portion 30d.
- the engaging portion provided on the guide rib 30 with the colonic stent 2 may be provided separately from the engaging portion 30b, or may be formed on the peripheral surface of the guide rib 30 in a concave shape.
- FIGS. 7A-7C are cross-sectional views schematically showing another example of the guide rib 30.
- the guide ribs 301 to 303 are different from the guide rib 30 (see FIG. 4) of the embodiment in that they are formed of a single molded product.
- a guide rib 301 shown in FIG. 7A has a tube fixing portion 30a and an engaging portion 30b.
- the three engaging portions 30b are connected to each other and provided on the peripheral surface of the tube fixing portion 30a so as to protrude from the tube fixing portion 30a.
- the mounting portion 30c provided on the tube fixing portion 30a is provided eccentrically with respect to the circumscribed circle of the guide rib 301 (broken line in FIG. 7A).
- the guide rib 302 shown in FIG. 7B has, for example, a disk shape, and through holes are formed therein that function as the mounting portion 30c and the guide portion 30d.
- the entire guide rib 302 forms the tube fixing portion 30a, and the end face in the axial direction forms the engaging portion 30b.
- the mounting portion 30c is provided eccentrically with respect to the circumscribed circle of the guide rib 302 (outer shape of the guide rib 302), and the formation area of the guide portion 30d is intentionally biased.
- the guide rib 303 shown in FIG. 7C has, for example, a disk shape, and through holes are formed therein that function as the mounting portion 30c and the guide portion 30d.
- the mounting portion 30c is not a complete “hole” that is separate from the outside. ing. That is, the mounting portion 30c is provided eccentrically with respect to the circumscribed circle of the guide rib 303, and the formation area of the guide portion 30d is intentionally biased.
- the arc shape of the mounting portion 30c is a shape that follows the outer shape of the inner tube 12. Also, in order to prevent the inner tube 12 from coming off, the central angle of the circular arc is preferably 180° or more (that is, larger than the semi-circular arc), for example.
- the guide ribs 301 to 303 shown in FIGS. 7A to 7C have the following features in addition to the features of the guide rib 30 (see FIGS. 4 and 6A) described in the embodiment. That is, while the guide rib 30 according to the embodiment is formed by bonding or welding a plurality of cylindrical members, the guide ribs 301 to 303 shown in FIGS. It is As a result, the guide ribs 301 to 303 can be easily manufactured, and the tube fixing portion 30a and the engaging portion 30b cannot be separated from each other, improving handling and safety.
- an eccentricity indicating the degree of eccentricity of the mounting portion 30c is preferably, for example, 1.0 to 3.5, more preferably 1.5 to 2.5.
- the eccentricity is expressed by the maximum length from the mounting portion 30c to the outer peripheral edges of the guide ribs 302 and 303 in the radial direction of the mounting portion 30c/(radius of the guide ribs 302 and 303 ⁇ radius of the mounting portion 30c).
- the guide rib 303 shown in FIG. 7C has a smaller outer diameter than the guide rib 302 in FIG. 7B when the area of the formation region of the guide portion 30d is set to be about the same. be able to. Therefore, the effect on the filling rate within the sheath 11 is further reduced, and the releasability of the colonic stent 2 from the sheath 11 is improved. Further, the guide rib 303 of FIG. 7C has a wider formation area for the guide portion 30d when the outer diameter is the same as compared with the guide rib 302 of FIG. 7B, so the formation of the guide portion 30d is further facilitated. .
- the guide rib 30 is concentric with the circumscribing circle of the guide rib 30 in a cross section perpendicular to the axial direction and provided with the mounting portion 30c.
- the first to third conversion means 20A to 20C having independent configurations are provided, but this is an example and is not limited to this. may be used as For example, the shape, length, and the like of the restraining string 21 and the holding wire 22 may be adjusted so that the colonic stent 2 is released in a predetermined order according to the amount of movement and the manner of movement. Furthermore, the number of conversion means is an example and is not limited to this, and at least one may be provided.
- the first to third conversion means 20A to 20C are used to maintain the colonic stent 2 in its entirety in the contracted state in the axial direction, but the conversion means 20 is at least a portion of the colonic stent 2. can be maintained in a contracted state.
- the first and second conversion means 20A, 20B maintain the contracted state of the first stent portion 2A and the second stent portion 2B of the colonic stent 2, and the third stent portion 2C. may be deployed as it is released from the sheath 11 .
- the colonic stent 2 which is a straight-type bare stent, has been exemplified and explained as a tubular indwelling device to be indwelled by the delivery system 100, but it is only an example and is not limited to this.
- a tubular indwelling device placed by the delivery system 100 can be, for example, a single-sided or double-sided flared stent.
- the tubular indwelling device may be a covered stent in which a coating is arranged wholly or partially around the skeleton.
- a mesh-type membrane having pores is preferable in order to pull out the conversion means 20 from the inside to the outside.
- the present invention is applicable not only to the colonic stent 2 described in the embodiment, but also to gastrointestinal stents placed in the gastrointestinal tract such as the esophagus and large intestine, and stent grafts placed in blood vessels.
- the fluid flowing through the digestive tract can be, for example, food immediately after ingestion that has not undergone any digestion, food that has been degraded as it passes through the digestive tract, or food that has not been digested after passing through the digestive tract. The state of the substance does not matter.
- catheter 2 colonic stent (tubular indwelling device) 11 sheath 12 inner tube (axial member) 20 conversion means 21 restraint string (linear member) 22 holding wire (linear member) 30, 301 to 303 guide rib (holding part) 30b engaging portion 30c mounting portion 30d guide portion 100 transport system C large intestine (biological lumen)
Abstract
Description
生体管腔内に留置される管状留置具を搬送するためのカテーテルであって、
シースと、
前記シース内を軸方向に移動可能に構成された長尺の軸状部材と、
前記管状留置具が前記シースから放出された状態で前記管状留置具の軸方向の少なくとも一部分を収縮状態に維持するとともに、前記一部分を収縮状態から拡張状態に変換可能な変換手段と、を備え、
前記軸状部材には、前記変換手段を保持する保持部が設けられ、
前記保持部は、収縮状態の前記管状留置具を当該軸状部材の軸方向に位置決め可能に形成されている。
生体管腔内に留置される管状留置具と、
前記管状留置具を前記生体管腔内に搬送するためのカテーテルと、を備える搬送システムであって、
前記カテーテルは、
シースと、
前記シース内を軸方向に移動可能に構成された長尺の軸状部材と、
前記管状留置具が前記シースから放出された状態で前記管状留置具の軸方向の少なくとも一部分を収縮状態に維持するとともに、前記一部分を収縮状態から拡張状態に変換可能な変換手段と、を備え、
前記軸状部材には、前記変換手段を保持する保持部が設けられ、
前記保持部は、収縮状態の前記管状留置具を当該軸状部材の軸方向に位置決め可能に形成されている。
なお、大腸ステント2を留置目標部位に留置するための搬送装置を「カテーテル1」と称し、カテーテル1に大腸ステント2が装填されたシステムを「搬送システム100」と称する。
搬送システム100は、大腸ステント2を大腸内に留置させる際に、例えば、内視鏡の鉗子孔に挿入して経内視鏡的に使用される。
大腸ステント2は、消化物が流れる管状流路を画成する筒形状を有する。大腸ステント2は、例えば、骨格のみで構成されているベアステントである。骨格は、大腸ステント2の拡張状態を維持するための補強部材であり、軸方向に略直交する径方向において、内側に収縮した収縮状態から、外側に拡張した拡張状態へと自己拡張可能に形成される。
シース11及びインナーチューブ12の近位側S2は、それぞれ、第1操作部13及び第2操作部14に接続されている。また、インナーチューブ12の遠位端には、先端チップ15が配置されている。
変換手段20の一例を図2に示す。変換手段20は、線状部材である拘束紐21と保持ワイヤー22によって構成されている。なお、変換手段20には、線状部材以外の構成を適用してもよい。
図3A、図3Bに示すように、第1~第3変換手段20A~20Cは、それぞれ、第1~第3拘束紐21A~21C及び第1~第3保持ワイヤー22A~22Cを有する。なお、図3Bでは、第1~第3保持ワイヤー22A~22Cを省略している。第1~第3変換手段20A~20Cは、それぞれ、独立して操作可能に構成されており、大腸ステント2の第1ステント部分2A~第3ステント部分2Cのうち、拡張すべきステント部分(例えば、第1ステント部分2A等)の拡張を、留置状態等を確認しながら柔軟に制御できるようになっている。
チューブ固定部30aは、例えば、円筒形状を有する。チューブ固定部30aに設けられた貫通孔30cに、インナーチューブ12が挿通される。つまり、貫通孔30cは、インナーチューブ12が取り付けられる取付部として機能する(以下、「取付部30c」と称する)。
また、大腸ステント2を留置目標部位に留置する場合に、第1~第3保持ワイヤー22A~22Cをインナーチューブ12の軸方向に沿って引き抜くことができ、インナーチューブ12やカテーテル1に撓みが生じることを抑制することができる。
なお、シース11の位置を固定した状態で、インナーチューブ12を口側に押し出すように移動させることで、大腸ステント2をシース11から放出してもよい。
これにより、複数の変換手段20により大腸ステント2の複数の部分を部分的に拡張可能な構成であっても、複数のガイドリブ30によってこれら複数の変換手段20の保持を適正に行うことができる。また、複数のガイドリブ30によって大腸ステント2のインナーチューブ12に対するその軸方向の位置決めをより適正に行うことができる。
これにより、インナーチューブ12に大腸ステント2が取り付けられた状態で、係合部30bと大腸ステント2とが係合することで、インナーチューブ12に対して大腸ステント2がずれにくくなり、ガイドリブ30による少なくとも一部分が収縮状態の大腸ステント2のインナーチューブ12に対するその軸方向の位置決めを行いやすくなる。
これにより、拘束紐21及び保持ワイヤー22を引き抜くという単純な操作で、大腸ステント2の一部分を収縮状態から拡張状態に変換することができる。
これにより、シース11内における充填率への影響が低減され、シース11から大腸ステント2を放出する際の放出性が向上する。
これにより、ガイド部30dによって拘束紐21及び保持ワイヤー22を適正に案内することができるだけでなく、当該係合部30bを利用して、ガイドリブ30と大腸ステント2を係合させることができ、ガイドリブ30の構成を簡易化することができる。
すなわち、実施の形態に係るガイドリブ30は、複数の円筒部材を接着又は溶着して形成されているのに対して、図7A~図7Cに示すガイドリブ301~303は、一部材の成形品で構成されている。
これにより、ガイドリブ301~303を容易に製造することができ、また、チューブ固定部30aと係合部30bは分離不能であり取扱性及び安全性が向上する。特に、ガイドリブ302及びガイドリブ303では、取付部30cを偏心させて形成した場合、ガイド部30dの形成領域が偏って形成されるので、ガイド部30dを容易に形成することができる。取付部30cの偏心度合いを示す偏心率は、例えば、1.0~3.5であることが好ましく、より好ましくは、1.5~2.5である。ここで、偏心率は、取付部30cの径方向における取付部30cからガイドリブ302、303の外周縁までの最大長さ/(ガイドリブ302、303の半径-取付部30cの半径)で表される。
2 大腸ステント(管状留置具)
11 シース
12 インナーチューブ(軸状部材)
20 変換手段
21 拘束紐(線状部材)
22 保持ワイヤー(線状部材)
30、301~303 ガイドリブ(保持部)
30b 係合部
30c 取付部
30d ガイド部
100 搬送システム
C 大腸(生体管腔)
Claims (9)
- 生体管腔内に留置される管状留置具を搬送するためのカテーテルであって、
シースと、
前記シース内を軸方向に移動可能に構成された長尺の軸状部材と、
前記管状留置具が前記シースから放出された状態で前記管状留置具の軸方向の少なくとも一部分を収縮状態に維持するとともに、前記一部分を収縮状態から拡張状態に変換可能な変換手段と、を備え、
前記軸状部材には、前記変換手段を保持する保持部が設けられ、
前記保持部は、収縮状態の前記管状留置具を当該軸状部材の軸方向に位置決め可能に形成されているカテーテル。 - 前記保持部は、前記軸状部材の軸方向に離間して複数設けられ、
前記変換手段は、前記複数の保持部に対応させて複数設けられている請求項1に記載のカテーテル。 - 前記保持部は、収縮状態の前記管状留置具と係合可能な係合部を有する請求項1または2に記載のカテーテル。
- 前記変換手段は、少なくとも一の線状部材を有し、
前記保持部は、前記軸状部材が取り付けられる取付部と、前記線状部材が挿通されるガイド部と、を有するガイドリブである、
請求項1又は2に記載のカテーテル。 - 前記取付部は、前記軸方向に直交する断面において、前記ガイドリブの外接円に対して偏心して設けられている、
請求項4に記載のカテーテル。 - 前記ガイドリブは、収縮状態の前記管状留置具と係合可能な係合部を有し、
前記ガイド部は、前記係合部に設けられている、
請求項4又は5に記載のカテーテル。 - 前記取付部の一部に切欠きが設けられている、
請求項5又は6に記載のカテーテル。 - 前記ガイドリブは、一部材の成形品である、
請求項4から7のいずれか一項に記載のカテーテル。 - 生体管腔内に留置される管状留置具と、
前記管状留置具を前記生体管腔内に搬送するためのカテーテルと、を備える搬送システムであって、
前記カテーテルは、
シースと、
前記シース内を軸方向に移動可能に構成された長尺の軸状部材と、
前記管状留置具が前記シースから放出された状態で前記管状留置具の軸方向の少なくとも一部分を収縮状態に維持するとともに、前記一部分を収縮状態から拡張状態に変換可能な変換手段と、を備え、
前記軸状部材には、前記変換手段を保持する保持部が設けられ、
前記保持部は、収縮状態の前記管状留置具を当該軸状部材の軸方向に位置決め可能に形成されている搬送システム。
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JP2020508085A (ja) * | 2017-02-24 | 2020-03-19 | ボルトン メディカル インコーポレイテッド | ステントグラフトを半径方向に収縮するための送達システムおよび使用方法 |
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