JP2005034464A - Treatment instrument insertion part of endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment instrument insertion part of an endoscope for using a treatment instrument using the endoscope, wherein the number of articles is reduced to be able to easily perform assembling and to reduce a cost, and strength of a treatment instrument insertion cap is sufficiently secured. <P>SOLUTION: The treatment instrument insertion cap 18 provided projectingly in an operation part 1 in order to insert the insertion instrument to the treatment instrument put-through channel 3 of the endoscope is formed from ceramics such as zirconia, and assembled by fixing in a state of abutting on a metallic cylindrical member 15 disposed at a depth part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a treatment instrument insertion portion of an endoscope.

  In order to use a treatment tool using an endoscope, a treatment tool insertion base for inserting the treatment tool into a treatment tool insertion channel inserted in the insertion portion of the endoscope is directed obliquely upward to the operation portion. Are arranged in a protruding state. Such a treatment instrument insertion cap is formed of stainless steel or the like in consideration of strength.

However, from the viewpoint of electrical safety, it is necessary to insulate between the internal member of the operation unit that is electrically connected to the insertion portion of the endoscope and the treatment instrument insertion base exposed on the outer surface of the operation unit. A spacer made of an electrically insulating synthetic resin is sandwiched between the base and the metal cylindrical member on the back side (for example, Patent Document 1).
Japanese Patent No. 2984034, FIG.

  However, as described above, inserting a synthetic resin spacer on the back side of the treatment instrument insertion base only to ensure electrical insulation is an assembly top-down and increases the number of parts, which increases the cost. It was also.

  Accordingly, the present invention provides a treatment instrument insertion portion of an endoscope that can be easily assembled and reduced in cost by reducing the number of parts and that can sufficiently secure the strength of the treatment instrument insertion base. Objective.

  In order to achieve the above object, the treatment instrument insertion portion of the endoscope of the present invention is formed by forming a treatment instrument insertion base projecting from the operation section with ceramic so as to insert the treatment instrument into the treatment instrument insertion channel. And assembled and fixed in a state of abutting against a metallic cylindrical member arranged on the back side.

  The treatment instrument insertion base and the metal cylindrical member may have a fitting portion that fits each other, and a sealing member may be attached to the fitting portion. The cylindrical member is arranged in series on the same axis, and the treatment instrument insertion base and the metallic cylindrical member are simultaneously pressed and fixed to the operation portion by a pressing member that presses the treatment instrument insertion base from the outside. Also good.

  According to the present invention, the treatment instrument insertion cap protruding from the operation portion for inserting the treatment instrument into the treatment instrument insertion channel is formed of ceramic, and is applied to the metal cylindrical member disposed on the back side thereof. By assembling and fixing in contact with each other, it is possible to eliminate the electrically insulating spacers, so that the number of parts can be reduced for easy assembly and cost reduction, and the strength of the treatment instrument insertion base is sufficiently secured. be able to.

  A treatment instrument insertion base formed by a pressing nut that presses the treatment instrument insertion base from the outside by arranging a treatment instrument insertion base formed of ceramic such as zirconia and a metal cylindrical member on the same axis in series. And the metallic cylindrical member are simultaneously pressed and fixed to the operation portion.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an operation part 1 of an endoscope, and a base end of an insertion part 2 covered with a flexible tube is connected to a lower end thereof.

  The proximal end of the treatment instrument insertion channel 3 made of, for example, a tetrafluoroethylene resin tube or the like inserted through the entire length of the insertion portion 2 is introduced into the operation portion 1 and obliquely upward from the vicinity of the lower end of the operation portion 1. Thus, the treatment instrument insertion portion 4 is formed so as to protrude.

  A treatment instrument insertion cap 18 that is disposed to project obliquely upward from the protruding end of the treatment instrument insertion portion 4 is connected to the treatment instrument insertion channel 3 so that the treatment instrument inserted from the treatment instrument insertion cap 18 is treated. It is guided into the tool insertion channel 3. A rubber forceps stopper 50 is detachably attached to the treatment instrument insertion base 18.

  A suction channel 5 branched from the treatment instrument insertion channel 3 in the vicinity of the root of the treatment instrument insertion section 4 is connected to a cylinder body 7 of a suction operation valve 6 disposed in the upper half of the operation section 1. . Reference numeral 8 denotes a suction operation button.

  2 shows the vicinity of the treatment instrument insertion portion 4, 1 ′ is an operation portion housing made of electrically insulating plastic, and 1 ″ is a metal operation portion frame. In FIG. 2, the forceps plug 50 is treated. It is removed from the tool insertion base 18.

  3 ′ is a connecting pipe connected to the base end opening of the treatment instrument insertion channel 3 by smoothly curving a stainless steel pipe, and a stainless steel branch arranged at the root portion of the treatment instrument insertion portion 4 It is connected to the connecting member 12.

  The suction channel 5 is connected to the branch end side of the T-shaped pipe formed in the branch connection member 12 via a connection pipe 5 '. The branch connection member 12 is screwed and connected to a metal cylindrical member 15 disposed in the treatment instrument insertion portion 4. Reference numeral 16 denotes a sealing O-ring attached to the connecting portion.

  The metallic cylindrical member 15 is inserted into the treatment tool by hooking a hook-shaped part 15a formed on the upper half side thereof into a step formed in the middle of a hole formed through the treatment tool insertion part 4. The part 4 cannot enter from the vicinity of the middle position. Reference numeral 17 denotes an O-ring for sealing the outer peripheral surface portion of the metal cylindrical member 15.

  The treatment instrument insertion base 18 has a configuration in which a portion that is submerged in the treatment instrument insertion portion 4 and a portion that protrudes from the treatment instrument insertion portion 4 are integrally formed of ceramic having excellent mechanical strength such as zirconia. It is pressed and fixed in the treatment instrument insertion part 4 from the outside by a pressing nut 19 (pressing member) screwed into the vicinity of the mouth of the treatment instrument insertion part 4.

  The treatment instrument insertion cap 18 and the metallic cylindrical member 15 are arranged in a state where they are superimposed in series on the same axis, and are arranged in a state where the surfaces come into contact with each other, and press the treatment instrument insertion cap 18 from the outside. The treatment instrument insertion cap 18 and the metallic cylindrical member 15 are simultaneously pressed and fixed to the treatment instrument insertion portion 4 by the pressing nut 19.

  Therefore, although the press nut 19 is made of metal, it is electrically completely insulated from the metal member inside the treatment instrument insertion portion 4. Reference numeral 20 denotes an O-ring for sealing between the inner peripheral surface of the pressing nut 19 and the outer peripheral surface of the treatment instrument insertion base 18.

  The treatment instrument insertion cap 18 and the metal cylindrical member 15 have a fitting portion A that fits within the treatment tool insertion portion 4, and a sealing O-ring 21 is provided in the fitting portion A. It is installed. In the fitting portion A of this embodiment, the outer peripheral surface of the metallic cylindrical member 15 is fitted to the inner peripheral surface of the treatment instrument insertion base 18.

  With such a configuration, a treatment instrument (not shown) inserted from the treatment instrument insertion base 18 is guided from the metal cylindrical member 15 through the branch connection member 12 into the treatment instrument insertion channel 3, Since the treatment instrument insertion cap 18 is formed of ceramic such as zirconia, the treatment instrument insertion cap 18 protruding to the outside is in an electrically insulated state from the metal member in the operation unit 1 and has excellent mechanical strength. Therefore, it will not be damaged by the insertion or removal of the treatment tool.

It is a side view of the operation part of the endoscope of the Example of this invention. It is side surface sectional drawing of the treatment tool insertion part of the endoscope of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Operation part 3 Treatment tool insertion channel 4 Treatment tool insertion part 15 Metal cylindrical member 18 Treatment tool insertion base 19 Press nut 20 O-ring A Fitting part

Claims (3)

In order to insert the treatment instrument into the treatment instrument insertion channel, a treatment instrument insertion base projecting from the operation portion is formed of ceramic, and is assembled and fixed so as to be in contact with a metal cylindrical member arranged on the back side thereof. An endoscopic treatment instrument insertion portion. The treatment of an endoscope according to claim 1, wherein the treatment tool insertion base and the metal cylindrical member have a fitting portion in which the fitting portion is fitted, and a sealing member is attached to the fitting portion. Tool insertion part. The treatment instrument insertion base and the metal cylindrical member are arranged in series on the same axis, and the treatment instrument insertion base and the metal cylindrical shape are pressed by a pressing member that presses the treatment instrument insertion base from the outside. The treatment instrument insertion portion of the endoscope according to claim 1 or 2, wherein the member is pressed and fixed to the operation portion at the same time.

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