JP2007020969A - High frequency treatment instrument for endoscope having water supply function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the disconnection between a nozzle pipe and a water supply tube even if supplying water with the nozzle pipe closed in a high frequency treatment instrument for an endoscope having a water supply function constituted that the distal end of the water supply tube inserted and disposed in a flexible sheath is connected to the nozzle pipe disposed at the distal end of the flexible sheath. <P>SOLUTION: The distal end of the water supply tube 10 and the nozzle pipe 11 are insertion-connected without adhesion so as to cause water leakage from the connection part corresponding to the water pressure applied to the connecting part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an endoscope high-frequency treatment instrument having a water supply function.

Many of the endoscope high-frequency treatment instruments having a water supply function have a configuration in which the space in the flexible sheath inserted into and removed from the treatment instrument insertion channel of the endoscope is used as a water channel. In recent years, in order to eliminate the disadvantages caused by the simple configuration, a flexible water supply tube that is exclusively used as a water supply channel is inserted into the flexible sheath (for example, Patent Document 1). .
JP-A-2005-80952

  If the water supply tube is inserted into the flexible sheath as described above, it is difficult to fix the tip of the water supply tube directly to the tip of the flexible sheath. It is realistic to place the tip of the water supply tube fixedly at the tip of the flexible sheath and connect the tip of the water supply tube to the nozzle pipe, and the connection between the water supply tube and the nozzle pipe is mutually connected. It is usual to bond and fix these with an adhesive.

  However, in the case where the treatment tool performs hemostasis or other high-frequency treatment, a burnt body tissue piece that is cauterized and scattered by the high-frequency current may block the nozzle pipe, and thus the nozzle pipe is blocked. Then, the water pressure applied to the joining and fixing part between the water supply tube and the nozzle pipe suddenly increases, the adhesion of the connection part is broken, the connection between the water supply tube and the nozzle pipe is disconnected in the flexible sheath, and the treatment tool is used. It may become impossible. In such a state, it becomes extremely difficult to repair the product, and the economic burden becomes extremely large.

  Therefore, the present invention provides a high-frequency treatment instrument for endoscope having a water supply function in which the tip of a water supply tube inserted and arranged in a flexible sheath is connected to a nozzle pipe arranged at the tip of the flexible sheath. The purpose of the present invention is to prevent the nozzle pipe and the water supply tube from being disconnected even if the water supply operation is performed in a state where the nozzle pipe is closed.

  In order to achieve the above object, the endoscope high-frequency treatment instrument having a water supply function according to the present invention has a flexible water supply tube in a flexible sheath that is inserted into and removed from the treatment instrument insertion channel of the endoscope. The tip of the water supply tube is connected to the nozzle pipe that is inserted and arranged at the distal end portion of the flexible sheath, and water is injected into the water supply tube from the water inlet that is connected to the base end of the water supply tube. In an endoscopic high-frequency treatment instrument having a water supply function configured such that water that has passed through the nozzle pipe is ejected from the tip of the nozzle pipe, the tip of the water supply tube and the nozzle pipe correspond to the water pressure applied to the connecting portion. The connector is inserted and connected without adhesion in a state where water leaks from the connecting portion.

  A high-frequency electrode may be disposed at the distal end of the flexible sheath, and the high-frequency electrode is a pair of bowl-shaped high-frequency electrodes that open and close in a bowl shape by remote operation from the proximal end side of the flexible sheath. The water ejected from the nozzle pipe may be configured to pass forward between the pair of high-frequency electrodes.

  Further, a nozzle pipe holding member that holds the nozzle pipe at the distal end portion of the flexible sheath may be provided, and the nozzle pipe holding member can freely rotate the pair of high-frequency electrodes to the distal end portion of the flexible sheath. It may be attached to a support shaft for supporting the shaft.

  Moreover, in the connection part of a water supply tube and a nozzle pipe, the water supply tube and the nozzle pipe are each formed in the cylindrical shape of a fixed diameter, and the nozzle pipe may be inserted without adhering in a water supply tube. .

  In that case, the nozzle pipe may be inserted into the tip of the water supply tube, and thereby the diameter of the tip of the water supply tube may be expanded, and in the state before the nozzle pipe is inserted into the water supply tube, The relationship between the diameter d and the inner diameter D of the water supply tube is preferably 0.92d ≦ D ≦ 1.03d.

  The insertion length of the nozzle pipe into the water supply tube is such that when the flexible sheath is bent into a 360 ° loop and the distal end portion of the water supply tube is pulled in the proximal direction, the water supply tube and the nozzle pipe It is good to set the length so that the connection of can not be disconnected.

  Further, a bulge that protrudes outward locally may be formed in the middle part of the region to be inserted into the water supply tube of the nozzle pipe, and a spiral groove is formed on the outer peripheral surface of the region near the tip of the water supply tube. It may be.

  Further, the proximal end of the water supply tube and the water supply base may be connected in a state where water leaks from the connection part corresponding to the water pressure applied to the connection part, and the connection between the water supply base and the water supply tube is possible. The part may be fastened by a heat shrinkable tube without being bonded.

  According to the present invention, the tip of the water supply tube and the nozzle pipe are inserted and connected without bonding to a state in which water leakage occurs from the connection portion corresponding to the water pressure applied to the connection portion. If the water supply operation is performed in a state where the nozzle is closed, water leaks from the connecting portion, and the connection between the nozzle pipe and the water supply tube cannot be disconnected.

  A flexible water supply tube is inserted and disposed in a flexible sheath that is inserted into and removed from the treatment instrument insertion channel of the endoscope, and the tip of the water supply tube is inserted into the nozzle pipe disposed at the distal end portion of the flexible sheath. An endoscope having a water supply function configured such that water that has passed through the water injection tube is ejected from the tip of the nozzle pipe by injecting water into the water supply tube from the water injection cap connected to the proximal end of the water supply tube. In the mirror high-frequency treatment tool, the tip of the water supply tube and the nozzle pipe are inserted and connected without bonding in a state where water leakage occurs from the connection portion corresponding to the water pressure applied to the connection portion.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 5 shows an endoscopic hot biopsy forceps used for hemostasis and tissue collection by high-frequency treatment through a treatment instrument insertion channel of an endoscope. However, the present invention can be applied to an endoscope high-frequency treatment instrument having various water supply functions.

  An operation wire 2 is inserted through the entire length of the flexible sheath 1 so as to be movable back and forth in the axial direction, and the distal end side of the flexible sheath 1 is moved forward and backward in the axial direction from the hand side. The metal tip forceps piece 3 which is a pair of high-frequency electrodes arranged in the shape is opened and closed like a bowl.

  The operation unit 20 disposed at the proximal end of the flexible sheath 1 has a slide operation in which the proximal end of the operation wire 2 is coupled to the operation unit main body 21 coupled to the proximal end of the flexible sheath 1. The member 22 is slidably disposed.

  The slide operation member 22 is provided with a connection terminal 23 for connecting a high-frequency power cord (not shown) so that a high-frequency current can be applied to the distal forceps piece 3 via the operation wire 2.

  Further, a water injection base 24 for injecting water by a water injection device 30 such as a syringe or the like protrudes from the side surface of the operation unit main body 21 and is connected to the water injection base 24, for example, a tetrafluoroethylene resin. A water supply tube 10 made of a tube is inserted through the entire length of the flexible sheath 1 in parallel with the operation wire 2.

  1 is a side cross-sectional view of the distal end portion of a hot biopsy forceps, FIG. 2 is a front cross-sectional view thereof, and FIGS. 3 and 4 are cross-sectional views taken along III-III and IV-IV in FIG. 1 is configured by covering an outer periphery of a tightly wound coil pipe 1a made of stainless steel wire with an electrically insulating flexible tube 1b.

  The distal end support frame 4 connected and fixed to the distal end of the flexible sheath 1 is formed in a shape in which a front end portion thereof is largely divided by a slit 41 and is integrally formed with the rear portion of the pair of distal forceps pieces 3. The connected drive arm 5 is disposed in the slit 41.

  In the vicinity of the distal end of the distal end support frame 4, a pair of support shafts 9 whose outer end sides are fixedly supported by the distal end support frame 4 in a cantilever state project into the slit 41 from both the left and right sides. Each spindle 9 is loosely passed through a hole formed in the vicinity of the boundary portion between the driving arm 5 and the distal forceps piece 3.

  As the operation wire 2, two wires made of a stranded wire or a single wire made of conductive stainless steel wire are used and arranged along the water supply tube 10 in the flexible sheath 1. Projecting forward from the distal end of the flexible sheath 1 and engaging with small holes 6 formed in the vicinity of the rear ends of the pair of drive arms 5.

  As a result, when the operation wire 2 is advanced and retracted in the operation unit 20, the driving arm 5 connected to the tip of the operation wire 2 is centered on the pair of support shafts 9 arranged in a state of being divided into two in the longitudinal direction. As a result, the distal forceps piece 3 opens and closes like a bowl around the support shaft 9.

  As shown in FIGS. 2 and 3, the tip end of the nozzle pipe 11 formed of a stainless steel pipe material or a PEEK (polyether ether ketone) resin pipe material or the like is provided on the inner end portions of the pair of support shafts 9. A nozzle pipe holding member 8 to be held is supported.

  The nozzle pipe 11 is passed through a through-hole formed in the nozzle pipe holding member 8 in the axial direction, and a front end nozzle port 11 a which is a front end opening of the nozzle pipe 11 has a rear end of the pair of front forceps pieces 3. An opening is arranged in a straight line toward the front at a central position in the vicinity.

  The tip nozzle port 11a is formed by expanding the tip of the nozzle pipe 11 in a taper shape, and at a position immediately after the nozzle pipe holding member 8, the nozzle pipe 11 is sandwiched with, for example, pliers or the like and is slightly crushed. A bulging portion 11b that bulges in the vertical direction is formed, so that the nozzle pipe 11 is fixed in a state in which it does not escape from the through hole of the nozzle pipe holding member 8 in either the front or rear direction.

  The nozzle pipe 11 is disposed straight in the axial position of the distal end of the flexible sheath 1, and is inserted into and connected to the distal end of the water supply tube 10 that is inserted through the entire length of the flexible sheath 1. The connecting portion is not joined by an adhesive or the like.

  In this embodiment, at the connecting portion between the water supply tube 10 and the nozzle pipe 11, the cross-sectional shapes of the water supply tube 10 and the nozzle pipe 11 are both circular, and the outer diameter dimension d of the nozzle pipe 11 is, for example, 0.6 mm. In contrast, the inner diameter D of the water supply tube 10 before the nozzle pipe 11 is inserted is in the range of 0.55 to 0.62 mm (that is, 0.92d ≦ D ≦ 1.03d).

  As a result of the experiment, when the inner diameter D of the water supply tube 10 is 0.54 mm or less, the nozzle pipe 11 is excessively press-fitted into the water supply tube 10, and the water supply tube 10 and the nozzle pipe are closed when the tip nozzle port 11a is blocked. 11 is not sufficiently leaked from the connecting portion (as a result, the tip of the water supply tube 10 may be detached from the nozzle pipe 11 due to an increase in water pressure), and the inner diameter D of the water supply tube 10 is 0.63 mm or more. Then, it is because the water may leak to such an extent that the connection portion between the water supply tube 10 and the nozzle pipe 11 causes trouble in a state where the tip nozzle port 11a is not blocked.

  When the outer diameter d of the nozzle pipe 11 is larger than the inner diameter D of the water supply tube 10, the nozzle pipe 11 is inserted into the water supply tube 10, so that the water supply tube 10 is lightly pressed into a state where it is slightly expanded. It is in the state.

  If the water supply tube 10 and the nozzle pipe 11 are not bonded and fixed at the connection portion in this way, the water supply tube 10 is passed through the treatment instrument insertion channel of the endoscope and the bending portion of the endoscope is bent. A phenomenon occurs in which the tube 10 moves by being pulled backward.

  Therefore, in this embodiment, the length L of the connecting portion between the water supply tube 10 and the nozzle pipe 11 is set so that the vicinity of the distal end of the flexible sheath 1 is a 360 ° loop as shown by a two-dot chain line in FIG. Even when bent, the length is set such that the connection between the water supply tube 10 and the nozzle pipe 11 is not disconnected.

  With such a configuration, when water is poured into the water supply tube 10 from the water filling cap 24 by the water pouring device 30, the water discharged from the tip nozzle port 11a of the nozzle pipe 11 is paired with a pair of tip forceps as shown in FIG. The target affected area can be easily washed when the tip forceps piece 3 is opened to face the target affected area through the space between the pieces 3 and blown to the front mucosal surface or the like.

  Then, the distal forceps piece 3 is energized with a high frequency current to cauterize the mucous membrane, so that hemostasis can be performed. As shown in FIG. 6, the distal end nozzle port 11a is blocked by the mucous burnt piece 100 or the like. In this state, the water that has passed through the water supply tube 10 by the water supply operation leaks to the outside from the connection portion between the water supply tube 10 and the nozzle pipe 11 that are not bonded and fixed, as indicated by the arrow A. The phenomenon that the connection between the water supply tube 10 and the nozzle pipe 11 is disconnected due to the water supply pressure does not occur.

  In addition, since the amount of water leakage from the connection part of the water supply tube 10 and the nozzle pipe 11 respond | corresponds to the magnitude | size of the water pressure added to the part, depending on the dimensional relationship of the water supply tube 10 and the nozzle pipe 11, the front-end nozzle port 11a is mucous membrane. A small amount of water leakage may occur from the connection portion of the water supply tube 10 and the nozzle pipe 11 even when the nozzle pipe 11 is not blocked by the burnt piece 100 or the like, but the outer diameter d of the nozzle pipe 11 is 0.6 mm. If the inner diameter D of the water supply tube 10 is 0.62 mm or less, most of the water is ejected forward from the tip nozzle port 11a, and there is almost no functional problem.

  FIG. 7 shows the distal end portion of the endoscope high-frequency treatment instrument according to the second embodiment of the present invention, and locally protrudes outward in the middle portion of the region where the nozzle pipe 11 is inserted into the water supply tube 10. The bulging part 11c which forms is formed, and the other structure is the same as the 1st Example.

  By forming the bulging portion 11c in this manner, the connection state between the nozzle pipe 11 and the water supply tube 10 can be stabilized, and such a bulging portion 11c is shown as a single unit in FIG. By squeezing the side surface portion 11d of the nozzle pipe 11 with, for example, pliers and crushing it a little, it is possible to form a bulging portion 11c that swells in a direction perpendicular thereto. However, it may be formed by other processing.

  FIG. 9 shows a third embodiment of the present invention, in which a spiral groove is formed on the outer peripheral surface of the region near the tip of the water supply tube 10, and the other configuration is the same as that of the first embodiment. . By doing so, the water supply tube 10 can be smoothly bent together with the flexible sheath 1 without buckling in the flexible sheath 1.

  FIG. 10 shows a fourth embodiment of the present invention, and the connecting portion between the water injection cap 24 and the proximal end portion of the water supply tube 10 also leaks water from the connecting portion corresponding to the water pressure applied to the connecting portion. The generated structure is the same as that of the first to third embodiments.

  In this embodiment, the water supply tube 10 is fitted and connected to the tip end portion of a metal connection pipe 25 extending from the bottom of the water injection cap 24, and the connection portion is heat-shrinkable without being bonded to each other. 26 is tightened.

  By comprising in this way, also in the connection part of the water injection nozzle | cap | die 24 and the base end part of the water supply tube 10, when an abnormally high water pressure is applied to the inside, leakage occurs and the connection part is not broken.

It is side surface sectional drawing of the front-end | tip part of the high frequency treatment tool for endoscopes which has the water supply function of 1st Example of this invention. It is front sectional drawing of the front-end | tip part of the high frequency treatment tool for endoscopes which has the water supply function of 1st Example of this invention. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2 of the endoscope high-frequency treatment instrument having a water supply function according to the first embodiment of the present invention. It is IV-IV sectional drawing in FIG. 2 of the high frequency treatment tool for endoscopes which has the water supply function of 1st Example of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an overall configuration of an endoscope high-frequency treatment instrument having a water supply function according to a first embodiment of the present invention. It is side surface sectional drawing of the front-end | tip part of the use condition of the high frequency treatment tool for endoscopes which has the water supply function of 1st Example of this invention. It is side surface sectional drawing of the front-end | tip part of the high frequency treatment tool for endoscopes which has the water supply function of 2nd Example of this invention. It is a fragmentary perspective view of the nozzle pipe of the high frequency treatment tool for endoscopes which has a water supply function of the 2nd example of the present invention. It is side surface sectional drawing of the front-end | tip part of the high frequency treatment tool for endoscopes which has the water supply function of 3rd Example of this invention. It is side surface sectional drawing of the connection part of the water injection cap of the high frequency treatment tool for endoscopes which has the water supply function of the 4th Example of this invention, and a water supply tube.

Explanation of symbols

1 Flexible sheath 3 Tip forceps piece (high frequency electrode)
8 Nozzle Pipe Holding Member 9 Supporting Shaft 10 Water Supply Tube 11 Nozzle Pipe 11a Tip Nozzle Port 11c Swelling Portion 24 Water Filler 25 Connection Pipe 26 Heat Shrink Tube D Water Supply Tube Inner Diameter Dimension d Nozzle Pipe Outer Diameter Dimension

Claims (13)

A flexible water supply tube is inserted into a flexible sheath inserted into and removed from the treatment instrument insertion channel of the endoscope, and the water supply tube is inserted into a nozzle pipe disposed at the distal end portion of the flexible sheath. The tip is connected, and the water that has passed through the water injection tube is ejected from the tip of the nozzle pipe by pouring water into the water supply tube from a water injection cap connected to the base end of the water supply tube. In an endoscope high-frequency treatment instrument having a water supply function,
The tip of the water supply tube and the nozzle pipe have a water supply function characterized by being inserted and connected without adhering to a state in which water leakage occurs from the connection portion corresponding to the water pressure applied to the connection portion. High-frequency treatment tool for endoscope.   The high-frequency treatment instrument for an endoscope having a water supply function according to claim 1, wherein a high-frequency electrode is disposed at a distal end of the flexible sheath.   The high-frequency electrodes are a pair of bowl-shaped high-frequency electrodes that open and close like a bowl by remote operation from the proximal end side of the flexible sheath, and water ejected from the nozzle pipe passes between the pair of high-frequency electrodes. The high-frequency treatment instrument for an endoscope having a water supply function according to claim 2, wherein the high-frequency treatment tool is configured to pass forward.   The high-frequency treatment instrument for an endoscope having a water supply function according to claim 1, wherein a nozzle pipe holding member for holding the nozzle pipe at a distal end portion of the flexible sheath is provided.   The endoscope having a water supply function according to claim 4, wherein the nozzle pipe holding member is attached to a support shaft for rotatably supporting the pair of high-frequency electrodes on a distal end portion of the flexible sheath. High frequency treatment tool.   In the connecting portion between the water supply tube and the nozzle pipe, the water supply tube and the nozzle pipe are each formed in a cylindrical shape having a constant diameter, and the nozzle pipe is inserted into the water supply tube without being bonded. An endoscopic high-frequency treatment instrument having a water supply function according to any one of claims 1 to 5.   The high-frequency treatment instrument for endoscope having a water supply function according to claim 6, wherein the nozzle pipe is inserted into the tip of the water supply tube, and thereby the diameter of the tip of the water supply tube is expanded.   The relation between the outer diameter dimension d of the nozzle pipe and the inner diameter dimension D of the water supply tube is 0.92d ≦ D ≦ 1.03d before the nozzle pipe is inserted into the water supply tube. A high-frequency treatment instrument for an endoscope having the water supply function described.   The insertion length of the nozzle pipe into the water supply tube is such that when the flexible sheath is bent into a 360 ° loop and the distal end portion of the water supply tube is pulled in the proximal direction, The high-frequency treatment instrument for an endoscope having a water supply function according to claim 6, 7 or 8, wherein the length is set such that the connection with the nozzle pipe is not disconnected.   10. An endoscope having a water supply function according to claim 6, 7, 8 or 9, wherein a bulge portion locally protruding outward is formed in an intermediate portion of an area of the nozzle pipe inserted into the water supply tube. High frequency treatment tool.   The high-frequency treatment instrument for an endoscope having a water supply function according to any one of claims 1 to 10, wherein a spiral groove is formed in an outer peripheral surface of a region near the tip of the water supply tube.   The base end of the water supply tube and the water injection cap are connected to each other in a state where water leaks from the connection portion corresponding to the water pressure applied to the connection portion. Endoscopic high-frequency treatment instrument having a water supply function.   The high-frequency treatment instrument for endoscope having a water supply function according to claim 12, wherein a connection portion between the water injection cap and the water supply tube is fastened by a heat shrinkable tube without being bonded.

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