WO2020035918A1 - Cathéter à électrode de type ballonnet - Google Patents

Cathéter à électrode de type ballonnet Download PDF

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Publication number
WO2020035918A1
WO2020035918A1 PCT/JP2018/030365 JP2018030365W WO2020035918A1 WO 2020035918 A1 WO2020035918 A1 WO 2020035918A1 JP 2018030365 W JP2018030365 W JP 2018030365W WO 2020035918 A1 WO2020035918 A1 WO 2020035918A1
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WO
WIPO (PCT)
Prior art keywords
balloon
outer tube
lumen
type electrode
fluid
Prior art date
Application number
PCT/JP2018/030365
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English (en)
Japanese (ja)
Inventor
謙二 森
Original Assignee
日本ライフライン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本ライフライン株式会社 filed Critical 日本ライフライン株式会社
Priority to PCT/JP2018/030365 priority Critical patent/WO2020035918A1/fr
Priority to JP2020537324A priority patent/JP6894582B2/ja
Priority to TW108112794A priority patent/TWI703955B/zh
Publication of WO2020035918A1 publication Critical patent/WO2020035918A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor

Definitions

  • the present invention relates to a balloon-type electrode catheter, and more particularly, to a balloon-type electrode catheter which is introduced transvascularly and is used for high-frequency ablation treatment of a vessel or its surrounding tissue.
  • an outer tube catheter shaft
  • a balloon connected to the distal end of the outer tube and an outer tube
  • the inner tube inserted into the lumen of the balloon and the lumen
  • the lumen tube supply lumen
  • the lumen tube inserted through the lumen of the outer tube to supply fluid to the interior of the balloon
  • the interior of the balloon That includes a lumen tube (return lumen) inserted into the lumen of the outer tube to discharge the fluid supplied to the outer tube, and a surface electrode (high-frequency electrode) provided on the outer surface of the balloon.
  • the balloon constituting the balloon-type electrode catheter described in Patent Literature 1 has an expanding portion that expands and contracts and neck portions formed at both ends thereof, and a proximal neck portion is fixed to the outer tube.
  • the distal neck portion is fixed to the inner tube (guide wire lumen).
  • high-frequency current is applied to a surface electrode provided on the outer surface of the balloon to perform high-frequency ablation treatment on a vascular vessel or a lesion tissue around the vessel. It can be carried out. Further, by circulating the fluid supplied from the lumen tube (supply lumen) into the balloon and discharging the fluid from the lumen tube (return lumen), the interior of the balloon can be cooled.
  • a high-frequency current is applied to a surface electrode formed on the outer surface of the balloon.
  • the present inventors have proposed a form of electrical connection by a conductive wire (see Patent Document 2 below).
  • JP-T-2013-532564A JP 2016-185296 A (in particular, FIG. 4)
  • a metal ring is mounted on the neck portion (proximal neck portion) of a balloon fixed to an outer tube (catheter shaft) as described in Patent Literature 2, and power is supplied through the metal ring. Can be considered.
  • an inner tube (a guide wire lumen) through which a guide wire is inserted and a cooling fluid through which a cooling fluid flows are provided in the lumen of the outer tube constituting the balloon-type electrode catheter described in Patent Document 1. Due to the inclusion of the lumen tube (supply lumen and return lumen), its outer diameter is quite large.
  • the outer diameter of the metal ring is determined by an electrode catheter.
  • the outer diameter (shaft diameter or wrapping diameter) that is limited by the sheath or endoscope used when introducing the catheter is greatly exceeded. The metal ring is caught, and it becomes impossible to insert a balloon-type electrode catheter into these lumens.
  • An object of the present invention is to allow transvascular introduction without impairing the penetrability of a sheath or an endoscope used in a lumen, and extensive cauterization of a vascular tissue or a surrounding lesion tissue.
  • An object of the present invention is to provide a balloon-type electrode catheter capable of performing treatment. It is another object of the present invention to provide a balloon-type electrode catheter capable of performing uniform cautery treatment on a vessel or a tissue around the vessel along the circumferential direction of the vessel. Still another object of the present invention is to provide a balloon-type electrode catheter which is excellent in the cooling effect of the inside of the balloon, and further, the cooling effect of the tissue around the surface electrode.
  • the balloon-type electrode catheter of the present invention is a balloon-type electrode catheter that is introduced transvascularly and performs high-frequency ablation treatment of a vessel or surrounding tissue, An outer tube having a central lumen and a plurality of sub-lumens disposed therearound, A current-carrying connector arranged on the proximal end side of the outer tube, An expansion portion that expands and contracts, and a neck connected to the distal end of the outer tube, having a continuous neck at both ends thereof, and having a proximal neck fixed to the distal end of the outer tube.
  • An inner tube having a lumen through which a guide wire can be inserted, being inserted into the central lumen of the outer tube, extending from the opening of the central lumen into the balloon, and extending inside the balloon,
  • a distal tip having a lumen communicating with the lumen of the inner tube, connected to a distal end of the inner tube inside the balloon, and fixed to a distal neck portion and extending outside the balloon;
  • a surface electrode made of a metal thin film formed on the outer surface of the balloon in the expanded portion and the distal neck portion, A metal ring electrically connected to the surface electrode by being mounted on the distal end neck of the balloon so that the inner peripheral surface thereof is in contact with the front end of the surface electrode,
  • the distal end is fixed to the inner peripheral surface of the metal ring, extends to the sublumen of the inside of the balloon and any of the outer tube, the base end is fixed to the connector for electricity,
  • a conducting wire for electrically connecting the surface electrode and the current-carrying connector.
  • the surface electrode formed on the outer surface of the balloon can be electrically connected to the current-carrying connector via the metal ring and the conducting wire.
  • High-frequency current can be reliably supplied. This makes it possible to perform ablation treatment over a wide range of the vascular tissue or the surrounding lesion tissue.
  • the distal neck portion of the balloon to which the metal ring is attached is a neck portion fixed to the distal tip, and has a significantly smaller outer diameter than the proximal neck portion fixed to the outer tube.
  • the outer diameter of the metal ring attached to the distal neck can be smaller than the outer diameter of the outer tube or the proximal neck.
  • the surface electrodes are formed so as to extend along the axial direction of the balloon, and are arranged in a plurality of strips arranged at equal angular intervals along the circumferential direction of the balloon. It is an electrode, and it is preferable that the inner peripheral surface of the metal ring is in contact with the tip of each of the strip electrodes.
  • each of the plurality of strip-shaped electrodes formed at equal angular intervals along the circumferential direction of the balloon is electrically connected to the current-carrying connector via the metal ring and the conductive wire.
  • High-frequency current can be uniformly applied to each of the plurality of band-shaped electrodes, and thereby, the vessel or the surrounding tissue can be passed along the circumferential direction of the vessel.
  • a homogeneous cautery treatment can be performed.
  • the metal ring is coated with an insulating material.
  • the balloon-type electrode catheter having such a configuration, it is possible to prevent the metal ring from becoming hot when energized, and to avoid cauterizing normal tissue around the metal ring.
  • At least one of the sub-lumens included in the outer tube is a fluid-supplying sub-lumen that circulates the fluid in order to supply a fluid to the inside of the balloon, It is preferable that at least one of the sub-lumens of the outer tube is a fluid discharge sub-lumen that allows the fluid to flow in order to discharge the fluid supplied to the inside of the balloon from the inside of the balloon.
  • the distal end portion of the outer tube fixed to the proximal end neck portion of the balloon is included in the expanded portion of the balloon.
  • the opening of the fluid supply sub-lumen is located more distally than the axially intermediate position of the expansion portion,
  • the opening of the fluid discharge sublumen is preferably located at or near the base end of the extension.
  • the fluid supply port to the inside of the balloon and the fluid discharge port from the inside of the balloon are axially displaced from each other. Even after the fluid is filled, the fluid flows from the distal end to the proximal end, and the fluid can flow inside the balloon. Thus, the tissue around the surface electrode can be sufficiently cooled.
  • the number of the sub-lumens for supplying fluid is larger than the number of sub-lumens for discharging fluid.
  • the inside of the balloon can be maintained at a constant pressure (expansion pressure).
  • the outer diameter of the distal end of the outer tube to which the proximal neck of the balloon is fixed is larger than the outer diameter of the proximal end of the outer tube. It is formed small, It is preferable that an outer diameter of the proximal neck portion of the balloon is substantially equal to an outer diameter of the proximal end portion of the outer tube.
  • the outer diameter of the proximal neck portion having the maximum outer diameter is substantially equal to the outer diameter of the proximal end portion of the outer tube.
  • the portion does not hinder the penetration of the sheath or endoscope into the lumen.
  • the outer diameter of the outer tube can be the maximum diameter limited by the sheath or the endoscope, it is necessary to sufficiently secure the diameter of the fluid supply sub-lumen and the fluid discharge sub-lumen of the outer tube.
  • the cooling effect inside the balloon can be further improved.
  • a temperature sensor is disposed on a tube wall of the balloon.
  • the balloon-type electrode catheter of this invention can introduce
  • a wide range of cautery treatments can be performed.
  • the balloon-type electrode catheter of the present invention provided with a surface electrode composed of a plurality of band-shaped electrodes, it is possible to perform a uniform cauterization treatment on a vessel or a tissue around the vessel along the circumferential direction of the vessel. it can.
  • the balloon further includes an outer tube having a fluid supply sub-lumen that opens on the distal side from the axial middle position of the balloon expansion portion, and a fluid discharge sub-lumen that opens at or near the proximal end of the balloon expansion portion.
  • FIG. 2 is a partially broken front view (a front view including a II-II cross section of FIG. 1) of the balloon-type electrode catheter shown in FIG. 1.
  • FIG. 2 is a perspective view showing a distal end portion of the balloon-type electrode catheter shown in FIG. 1.
  • FIG. 2 is a perspective view showing a distal end portion (the distal end side of the balloon) of the balloon-type electrode catheter shown in FIG. 1.
  • FIG. 2 is a perspective view showing a distal end portion (a proximal end side of the balloon) of the balloon-type electrode catheter shown in FIG. 1.
  • FIG. 3 is a partially enlarged view (a detailed view of a VI section) of FIG. 2.
  • FIG. 2 is a partially broken front view (a front view including a II-II cross section of FIG. 1) of the balloon-type electrode catheter shown in FIG. 1.
  • FIG. 2 is a perspective view showing a distal end portion of the balloon-type electrode catheter shown in FIG. 1.
  • FIG. 2 is a perspective view
  • FIG. 7 is a partially enlarged view (a detailed view of a VII section) of FIG. 6. It is the elements on larger scale of FIG. 2 (VIII section detailed drawing). It is IX-IX sectional drawing of FIG. It is the elements on larger scale of FIG. 9 (X part detailed view).
  • FIG. 2 is a sectional view taken along the line XI-XI in FIG. 1.
  • FIG. 2 is a sectional view taken along line XII-XII of FIG. 1.
  • FIG. 13 is a partially enlarged view (a detailed view of an XIII portion) of FIG. 12.
  • FIG. 4 is a sectional view taken along line XIV-XIV of FIG. 1. It is XV-XV sectional drawing of FIG. It is the elements on larger scale of FIG.
  • FIG. 7 is a sectional view taken along line XVII-XVII of FIG. 1. It is the elements on larger scale of FIG. 17 (XVIII part detailed view). It is XIX-XIX sectional drawing of FIG. FIG. 20 is a partially enlarged view (XX section detailed view) of FIG. 19.
  • FIG. 2 is a sectional view taken along line XXI-XXI of FIG. 1. It is the elements on larger scale of FIG. 21 (XXII part detailed figure).
  • FIG. 3 is a sectional view taken along line XXIII-XXIII of FIG. 1.
  • FIG. 4 is a sectional view taken along line XXIV-XXIV of FIG. 1.
  • the balloon-type electrode catheter 100 of this embodiment is a balloon-type electrode catheter that is introduced transvascularly and treats a lesion tissue such as a tumor in or around a vessel by high-frequency ablation.
  • the balloon-type electrode catheter 100 shown in FIGS. 1 to 24 is composed of a circular tubular portion 11 and a semicircular tubular portion 13, and has an outer tube having a central lumen 10L and sublumens 101L to 112L disposed therearound.
  • the metal ring 6 electrically connected to each of the strip electrodes 51 to 54 is provided.
  • the distal end is connected to the inner peripheral surface of the metal ring 60, the inner peripheral surface of the metallic ring 60 extends to the inside of the balloon 30 and the sublumen 112 ⁇ / b> L of the outer tube 10 (the tubular portion 11), and the proximal end thereof is connected to the electrical connector 21.
  • the distal end (temperature measuring section 81) is buried in the tube wall of the expansion section 31 of the balloon 30, and the tube wall of the expansion section 31 and the proximal neck section 35 and the outer tube 10 (the circular tubular section 11).
  • a temperature sensor (thermocouple) 80 extending to the lumen 106L and having a proximal end connected to the electrical connector 21 is provided.
  • 20 is a Y connector connected to the proximal end side of the outer tube 10
  • 22 is a fluid supply connector
  • 23 is a fluid discharge connector
  • 24 is a guide wire connector
  • 26 is a lead protection tube
  • 27 is a fluid supply tube
  • 28 is a fluid discharge tube.
  • the outer tube 10 constituting the balloon-type electrode catheter 100 includes a circular tubular portion 11 and a semicircular tubular portion 13.
  • a part of the proximal end and the distal end of the outer tube 10 is constituted by a circular tubular portion 11, and a distal end (excluding the above-mentioned part) of the outer tube 10 is constituted by a semicircular tubular portion 13.
  • each of the sublumens 101L to 112L is formed by a lumen tube surrounding the same, and these lumen tubes are fixed by a binder resin forming the tubular portion 11.
  • sublumens 101L to 105L are formed inside the semicircular tubular portion 13 of the outer tube 10 continuously from the inside of the tubular portion 11.
  • the lumen tube surrounding each of the sublumens 101L to 105L in the semicircular tubular portion 13 is fixed by a binder resin forming the semicircular tubular portion 13.
  • the sublumens 101L to 105L disposed inside the tubular portion 11 and the semicircular portion 13 are semicircular tubular portions which are the distal end surfaces of the outer tube 10, respectively. 13 has an opening at the distal end surface 14.
  • Each of the sublumens 101L to 105L is in communication with the fluid supply connector 22 shown in FIGS.
  • the sub-lumens 101L to 105L (five of the twelve sub-lumens formed in the outer tube 10) supply fluid to the inside of the balloon 30 (expansion portion 31).
  • the fluid supplied to the inside of the balloon 30 can be exemplified by physiological saline.
  • the central lumen 10L and the sublumens 106L to 112L formed inside the tubular portion 11 are open at the distal end surface 12 of the tubular portion 11, respectively.
  • the openings of the sub-lumens 106L, 110L, and 112L are sealed by a seal material 90 shown in FIG.
  • Each of the sublumens 107L to 111L communicates with the fluid discharge connector 23 shown in FIG. Accordingly, the sub-lumens 107L to 109L and 111L (four of the twelve sub-lumens formed in the outer tube 10) supply the fluid supplied to the inside of the balloon 30 (expansion portion 31). It serves as a “fluid discharge sublumen” for discharging from inside the balloon 30.
  • the constituent material of the outer tube 10 is not particularly limited, and examples thereof include polyamide-based resins such as polyamide, polyether polyamide, polyether block amide (PEBAX (registered trademark)), and nylon. Of these, PEBAX is preferred.
  • An outer diameter of the outer tube 10 (an outer diameter at a base end to be described later) is usually 1.0 to 3.3 mm, and is 1.45 mm as a preferable example.
  • the diameter of the central lumen 10L of the outer tube 10 is usually 0.35 to 0.95 mm, and 0.85 mm as a preferable example.
  • the diameter of the sublumens 101L to 112L of the outer tube 10 is usually 0.10 to 0.75 mm, and is 0.25 mm as a preferable example.
  • the length of the outer tube 10 is usually 100 to 2200 mm, and is 1800 mm in a preferred example.
  • a Y connector 20 is connected to the base end side of the outer tube 10. As shown in FIG. 23, the lumen tubes surrounding the sub lumens 101L to 105L and the sub lumens 107L to 111L of the outer tube 10 enter the inside of the Y connector 20 from the base end of the outer tube 10.
  • the proximal end of the lumen tube surrounding the sublumens 101L to 105L is connected (bonded) to the single lumen structure fluid supply tube 27 inside the Y connector 20. Fixed by an agent 95).
  • the fluid supply tube 27 extends outside the Y connector 20, and the proximal end of the fluid supply tube 27 is connected to the fluid supply connector 22.
  • the proximal end of the lumen tube surrounding the sublumens 107L to 111L is connected (fixed by an adhesive 95) to the single lumen structure fluid discharge tube 28 inside the Y connector 20.
  • the fluid discharge tube 28 extends outside the Y connector 20, and the proximal end of the fluid discharge tube 28 is connected to the fluid discharge connector 23.
  • the balloon 30 constituting the balloon-type electrode catheter 100 includes an expanding portion 31 that expands and contracts, a distal neck portion 33 continuous with the distal end of the expanding portion 31, and a proximal neck portion 35 continuous with the proximal end of the expanding portion 31. It is composed of
  • the expansion portion 31 of the balloon 30 is a space forming portion that expands when a fluid is supplied to the inside thereof, and contracts when the fluid is discharged from the inside.
  • the expanded portion 31 of the balloon 30 includes a cylindrical portion 311, a distal cone portion 313 extending from the distal end of the cylindrical portion 311 to the proximal end of the distal neck portion 33, A proximal cone portion 315 extends from the proximal end of the portion 311 to the distal end of the proximal neck portion 35.
  • the proximal neck 35 is fixed to the distal end of the outer tube 10 (the distal end constituted by the tubular portion 11), and the distal end of the outer tube 10 (the distal end constituted by the semicircular tubular portion 13).
  • the balloon 30 is connected to the distal end side of the outer tube 10 by including the expansion portion 31 in the outer tube 10.
  • the distal end portion (the circular tubular portion 11 shown in FIG. 19) of the outer tube 10 to which the proximal end neck portion 35 of the balloon 30 is fixed has a surface layer portion cut off.
  • the outer diameter of the outer tube 10 to which the side neck portion 35 is not fixed is smaller than the outer diameter of the proximal end portion (the circular tubular portion 11 shown in FIG. 21).
  • the outer diameter of the proximal neck portion 35 shown in FIG. 19 is substantially equal to the outer diameter of the proximal portion of the outer tube 10 shown in FIG.
  • the outer diameter of the outer tube 10 can be set to the maximum diameter limited by the sheath or the endoscope (there is no need to consider the increase in the outer diameter due to the thickness of the proximal neck portion).
  • the diameter of the sublumens 101L to 112L can be sufficiently ensured, and the cooling effect inside the balloon 30 can be further improved.
  • the distal end surface 14 of the semicircular tubular portion 13 in which the fluid supply sublumen 101L to 105L is open is located closer to the distal end than the axially intermediate position of the expanded portion 31 of the balloon 30. It is located near the tip of the cylindrical portion 311.
  • the fluid flowing through the fluid supply sublumen 101L to 105L is discharged in the distal direction from each of the openings located near the distal end of the cylindrical portion 311. It is possible to reach the vicinity of the distal end of the portion 313), whereby a fluid flow from the distal side to the proximal side can be formed inside the balloon 30 (expansion portion 31).
  • the opening position of the fluid supply sub-lumen is located on the proximal side from the axial middle position of the balloon expansion portion, even if the fluid is discharged from the opening toward the distal end after the balloon expansion, the expansion portion is Cannot reach the vicinity of the distal end of the balloon, and the flow of the fluid from the distal side to the proximal side cannot be formed inside the balloon.
  • the distal end surface 12 of the tubular portion 11 from which the fluid discharge sublumens 107L to 109L and 111L open is located at the base end of the expansion portion 31.
  • the constituent material of the balloon 30 is not particularly limited, and the same material as that of a balloon constituting a conventionally known balloon catheter can be used.
  • polyamide such as polyamide, polyether polyamide, PEBAX and nylon
  • Polyurethane resins such as thermoplastic polyether urethane, polyether polyurethane urea, fluorine polyether urethane urea, polyether polyurethane urea resin, and polyether polyurethane urea amide.
  • the diameter of the balloon 30 is usually 0.7 to 30.0 mm, and is 2.0 mm in a preferred example.
  • the outer diameter of the proximal end neck portion 35 of the balloon 30 is substantially equal to the outer diameter of the proximal end portion of the outer tube 10, and is usually 1.0 to 3.3 mm, or 1.45 mm in a preferred example. It is.
  • the length of the balloon 30 (expansion part 31) is usually 8 to 50 mm, and is 20 mm in a preferred example.
  • the inner tube 41 and the distal end tip 46 constitute an inner shaft.
  • the inner tube 41 constituting the balloon-type electrode catheter 100 has a lumen (guidewire lumen) through which a guidewire can be inserted, and is inserted into the central lumen 10L of the outer tube 10 (circular tubular portion 11), and its distal end is inserted.
  • the central lumen 10L extends into the balloon 30 (expanded portion 31) from the opening.
  • the distal end portion of the inner tube 41 extending into the balloon 30 has a semicircular portion of the outer peripheral surface covered with the semicircular tubular portion 13, and has a proximal-side cone portion 315 of the expanded portion 31.
  • the base end of the inner tube 41 enters the inside of the Y connector 20 from the base end of the outer tube 10 (the opening on the base end side of the central lumen 10L), and The inside of the inner tube 41 extends to the outside of the Y connector 20, and the base end of the inner tube 41 is connected to the guide wire connector 24.
  • the same material as the inner tube constituting the conventionally known balloon catheter can be used.
  • PEEK resin polyetherether which is a crystalline thermoplastic resin having excellent mechanical properties
  • Ketone resins are preferred.
  • the outer diameter of the inner tube 41 is equal to or slightly smaller than the diameter of the central lumen 10L of the outer tube 10 into which the inner tube 41 is inserted, and is usually 0.34 to 0.99 mm, and 0.84 mm as a preferable example. It is said.
  • the inner diameter of the inner tube 41 is usually 0.31 to 0.92 mm, and is 0.68 mm in a preferred example.
  • the distal tip 46 constituting the balloon-type electrode catheter 100 has a lumen (guidewire lumen) communicating with the guidewire lumen of the inner tube 41, and the inner tube inside the distal-side cone portion 313 of the expansion section 31 of the balloon 30. It is connected to the distal end of the balloon 41 and is fixed to the distal side neck portion 33 and extends outside the balloon 30.
  • the tip of the tip 46 is open.
  • the constituent material of the tip 46 is not particularly limited, and examples thereof include polyamide, polyether polyamide, polyamide resins such as PEBAX and nylon, and polyurethane.
  • the inner diameter of the distal end tip 46 is substantially the same as the inner diameter of the inner tube 41, and is usually 0.31 to 0.92 mm, and 0.68 mm as a preferable example.
  • the outer diameter of the distal end tip 46 is usually 0.35 to 2.6 mm, and is 1.0 mm in a preferred example.
  • the outer diameter of the distal end neck portion 33 of the balloon 30 to which the distal end tip 46 is fixed is usually 0.37 to 3.3 mm, and is 1.18 mm as a preferable example.
  • a high-frequency current is applied to the outer surfaces of the balloon 30 (the cylindrical portion 311 and the distal cone portion 313 of the expanded portion 31 and the distal neck portion 33).
  • surface electrodes to be formed strip-shaped electrodes 51 to 54 formed of a metal thin film so as to extend along the axial direction of the balloon 30 are arranged at 90 ° intervals along the circumferential direction of the balloon 30.
  • the thickness of the metal thin film forming the strip electrodes 51 to 54 is preferably 0.5 to 5.0 ⁇ m, and more preferably 1.0 to 2.5 ⁇ m. If the film thickness is too small, the metal thin film may become hot due to Joule heat during the procedure (during high-frequency current application). On the other hand, when the thickness of the thin film is excessively large, the metal thin film does not easily follow the shape change of the balloon due to expansion and contraction, and the expansion and contraction properties of the balloon may be impaired.
  • the method for forming the metal thin film forming the strip electrodes 51 to 54 on the outer surface of the balloon 30 is not particularly limited, and a normal metal thin film forming method such as vapor deposition, sputtering, plating, and printing may be employed. it can.
  • a metal ring 60 is mounted on the distal end neck 33 of the balloon 30.
  • the metal ring 60 constituting the balloon-type electrode catheter 100 is caulked and fixed to the distal-end-side neck portion 33 such that the inner peripheral surface thereof comes into contact with the distal end portion of each of the strip electrodes 51 to 54.
  • Each of the strip electrodes 51 to 54 and the metal ring 60 are electrically connected.
  • the metal ring 60 As a constituent material of the metal ring 60, platinum or a platinum-based alloy can be used. As shown in FIG. 9, the metal ring 60 is insulated and covered with a resin material 65. Thus, it is possible to prevent the metal ring 60 from being heated at the time of energization, and to avoid cauterizing normal tissue around the metal ring 60.
  • the inner diameter of the metal ring 60 attached to the distal side neck 33 is substantially the same as the outer diameter of the distal side neck 33, usually 0.37 to 3.3 mm. .18 mm.
  • the outer diameter of the metal ring 60 attached to the distal neck portion 33 is smaller than the outer diameter of the outer tube 10 and the proximal neck portion 35, and is usually 0.98 to 3.28 mm. For example, it is 1.32 mm.
  • the distal end of the conducting wire 70 is fixed to the inner peripheral surface of the metal ring 60.
  • This conducting wire 70 extends into the tube wall of the distal end tip 46 as shown in FIGS. 9 and 11, and expands the balloon 30 along the inner tube 41 as shown in FIGS. 12, 14 and 15.
  • the base end of the conducting wire 70 is connected to the electric connector 21.
  • the electric connector 21 has both a function as an energizing connector for applying a high-frequency current to each of the strip electrodes 51 to 54 and a function as a thermocouple connector for connecting the temperature sensor 80 to a temperature measuring instrument. .
  • Examples of the constituent material of the conductive wire 70 include copper, silver, gold, platinum, tungsten and alloys of these metals, and it is preferable that an electrically insulating protective coating such as a fluororesin is applied.
  • a temperature sensor 80 composed of a thermocouple is embedded in the tube wall of the balloon 30.
  • the side temperature section 81 (temperature measurement contact) of the temperature sensor 80 is located on the tube wall of the extension section 31.
  • the temperature sensor 80 is connected to the proximal neck 35 of the balloon 30.
  • the sub-lumen 106L of the outer tube 10 enters the sub-lumen 106L and extends to the sub-lumen 106L.
  • It extends from the Y connector 20 through the inside of a wire protection tube 26 that extends and extends from the Y connector 20.
  • the base end of the temperature sensor 80 is connected to the electric connector 21.
  • a wide range of high-frequency ablation treatment can be performed on a lesion in or around a blood vessel by each of the band-shaped electrodes 51 to 54 formed on the outer surface of the balloon 30. it can.
  • the metal ring 60 is mounted on the distal end neck of the balloon 30 so that the inner peripheral surface of the distal end of each of the strip electrodes 51 to 54 comes into contact with the distal end of each of the strip electrodes 51 to 54. Since it is electrically connected to the electrical connector 21 via the metal ring 60 and the conducting wire 70, high-frequency current can be uniformly applied to each of the strip electrodes 51 to 54, and thereby, Alternatively, the lesion tissue around it can be uniformly cauterized along the circumferential direction of the vessel.
  • the outer diameter of the metal ring 60 attached to the distal neck portion 33 of the balloon 30 is smaller than the outer diameter of the outer tube 10 and the proximal neck portion 35, a sheath or an endoscope used at the time of introduction is used. There is no possibility that the metal ring 60 is caught in the opening of the balloon electrode, and the penetrability of the balloon-type electrode catheter 100 into the lumen of the sheath or the endoscope is not impaired.
  • each of the fluid supply sub-lumens 101L to 105L is opened at the distal end surface 14 of the semicircular tubular portion 13 located near the distal end of the cylindrical portion 311 of the expansion portion 31 of the balloon 30, and the fluid discharge sub-lumen 107L is provided.
  • 109109L and 111L are open at the distal end face 12 of the tubular portion 11 located at the base end of the expansion portion 31 of the balloon 30, so that the balloon 30 can be expanded (after the fluid is filled therein). ), The flow of the fluid from the distal side to the proximal side can be formed inside the balloon 30, and the fluid can flow.
  • the fluid discharged in the distal direction from the openings of the fluid supply sub-lumens 101L to 105L hits the inner wall surface of the distal-side cone portion 313 of the extension portion 31, and thereafter, the cylindrical portion 311 and the base end of the extension portion 31 By flowing in the proximal direction along the inner wall surface of the side cone portion 315, a fluid can be circulated inside the balloon 30 (expansion portion 31).
  • the cases to which the balloon-type electrode catheter 100 of the present embodiment can be applied include tumors and vagus nerves in or around blood vessels, and specifically, bile duct cancer, lung cancer, liver cancer, kidney cancer, adrenal adenoma And renal artery vagus nerve.
  • the present invention is not limited to these embodiments, and various modifications are possible.
  • the position of the distal end surface 14 of the semicircular tubular portion 13 inside the balloon 30 (the opening position of the fluid supply sub-lumens 101L to 105L) is on the distal end side with respect to the axially intermediate position of the expansion portion 31, It does not need to be near the tip of the cylindrical portion 311 of the extension portion 31.
  • the opening of the fluid supply sublumen and / or the fluid discharge sublumen is formed on the outer peripheral surface of the outer tube, and the fluid is discharged / discharged in the radial direction of the outer tube. Good.
  • the opening of the fluid supply sublumen is located at or near the proximal end of the expansion portion of the balloon, and the opening of the fluid discharge sublumen is located more distally than the axial middle position of the expansion portion. It may be.
  • the fluid supply sub-lumen and the fluid discharge sub-lumen may be open at the same axial position.
  • Balloon type electrode catheter 10 Outer tube 10L Central lumen 101L-105L Sublumen (sublumen for fluid supply) 107L to 109L, 111L Sublumen (sublumen for fluid discharge) 106L, 110L, 112L Sublumen 11 Circular section 12 Tip face of tubular section 13 Semicircular section 14 Tip face of semicircular section 20 Y connector 21 Electrical connector 22 Connector for fluid supply 23 Connector for fluid discharge 24 Guide wire Connector 26 Conductive wire protection tube 27 Fluid supply tube 28 Fluid discharge tube 30 Balloon 31 Expansion part 311 Cylindrical part 311 313 Tip cone section 313 315 proximal cone portion 315 33 distal end neck 35 proximal end neck 41 inner tube 46 distal tip 51-54 strip electrode (surface electrode) 60 Metal ring 70 Conductor 80 Temperature sensor (thermocouple) 81 Temperature measurement part of temperature sensor 90 Seal material 95 Adhesive

Abstract

L'objectif de la présente invention est de fournir un cathéter à électrode de type ballonnet qui peut être introduit de manière intravasculaire sans affecter la capacité d'une gaine ou d'un endoscope à être inséré dans une lumière et qui permet également de cautériser un tissu de lésion sur une large zone. Ce cathéter à électrode de type ballonnet comprend : un tube externe (10) ; un connecteur d'excitation (21) ; un ballonnet (30) qui a une partie col (33), (35) à l'une ou l'autre extrémité d'une partie expansion (31) ; un tube interne (41) ; une pointe d'extrémité distale (46) ; des électrodes de bande (51)–(54) qui sont formées sur une surface externe du ballonnet (30) ; un anneau métallique (60) qui est installé au niveau d'une partie col côté extrémité distale (31) de telle sorte qu'une surface circonférentielle interne de celui-ci entre en contact avec une partie extrémité distale de chacune des électrodes de bande (51)–(54) ; et un fil conducteur (70) qui connecte électriquement le connecteur d'excitation (21) et chacune des électrodes de bande (51)–(54) du fait qu'une extrémité distale de celui-ci est fixée à la surface circonférentielle interne de l'anneau métallique (60) et une extrémité de base de celle-ci est fixée au connecteur d'excitation (21).
PCT/JP2018/030365 2018-08-15 2018-08-15 Cathéter à électrode de type ballonnet WO2020035918A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/JP2018/030365 WO2020035918A1 (fr) 2018-08-15 2018-08-15 Cathéter à électrode de type ballonnet
JP2020537324A JP6894582B2 (ja) 2018-08-15 2018-08-15 バルーン型電極カテーテル
TW108112794A TWI703955B (zh) 2018-08-15 2019-04-12 氣球型電極導管

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/030365 WO2020035918A1 (fr) 2018-08-15 2018-08-15 Cathéter à électrode de type ballonnet

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