JP4476012B2 - Endoscope treatment device raising device - Google Patents

Description

  The present invention relates to a treatment instrument raising device for an endoscope.

In an endoscope, generally, a bending portion that is bent by a remote operation from the proximal end side of the insertion portion is formed near the distal end of the flexible insertion portion. In an endoscope having a treatment instrument raising device, The treatment tool raising piece for changing the protruding direction of the treatment tool is movably disposed at the most distal end portion of the insertion portion, and remotely from the proximal end side of the insertion portion to drive the treatment tool raising piece. A raising and lowering operation wire that is advanced and retracted is inserted and arranged so as to be movable forward and backward in the axial direction in a guide coil that is inserted and arranged over the entire length in the insertion portion (for example, Patent Document 1).
JP 5-115431 A

  As a guide coil for guiding the raising piece operation wire of the endoscope as described above, a coil in which a stainless steel wire or the like is tightly wound with a constant diameter so that the raising piece operation wire is not contracted when being pulled. Pipes are used.

  FIG. 5 shows a cross-sectional shape of such a guide coil 91 and a raising piece operating wire 92 passed through the guide coil 91, and so-called built-in items such as an optical fiber bundle when the bending portion is bent. A guide coil 91 having a wire diameter of a certain value or less is used so that the wire is not pressed and damaged.

  However, in such a conventional endoscope treatment instrument raising device, when a so-called low-rigid treatment instrument is used and the force for pulling up the raising piece operation wire 92 is remarkably increased, it is shown in FIG. As shown, the guide coil 91 is undulated by the compressive force acting in the axial direction and is elastically deformed so that the overall length is substantially shortened. As a result, the pulling stroke on the distal end side of the raising piece operating wire 92 is reduced. It becomes small and it becomes the state which cannot raise a treatment tool fully.

  Therefore, the present invention provides an endoscope treatment instrument raising apparatus that can sufficiently raise a treatment instrument by securing a pulling stroke of the raising piece operation wire even when a treatment instrument having a strong waist is used. The purpose is to provide.

  In order to achieve the above object, in the endoscope treatment instrument raising device of the present invention, a bending portion that is bent by remote operation from the proximal end side of the insertion portion is formed near the distal end of the flexible insertion portion. A treatment instrument raising piece for changing the protruding direction of the treatment instrument is movably disposed at the most distal end portion of the insertion portion, and remotely from the proximal end side of the insertion portion to drive the treatment instrument raising piece. In a treatment instrument raising apparatus for an endoscope in which a raising piece operating wire that is moved forward and backward is inserted and arranged so as to be able to advance and retreat in the axial direction in a guide coil that is formed of a tightly wound coil that is inserted and arranged in the entire length of the insertion portion. The wire diameter of the guide coil in the part arranged outside the curved part is formed thicker than that in the part arranged in the curved part.

  According to the present invention, the portion of the guide coil that is disposed in the bending portion has a thin wire diameter, so when the bending portion is bent, it does not become a large resistance to the bending portion, and the built-in object is compressed and damaged. On the other hand, the portion of the guide coil that is arranged outside the curved portion has a large wire diameter, so that it has a strong waist. Even when the length of the guide coil is significantly increased, the entire length of the guide coil is hardly reduced, so that the pulling stroke of the raising piece operating wire is secured and the distal end portion of the treatment instrument can be sufficiently raised.

  A bending portion that is bent by a remote operation from the proximal end side of the insertion portion is formed in the vicinity of the distal end of the flexible insertion portion, and a treatment tool raising piece for changing the protruding direction of the treatment tools is provided on the insertion portion. A lifting piece operating wire, which is movably arranged at the most advanced part and is remotely advanced and retracted from the proximal end side of the insertion part to drive the treatment tool raising piece, is inserted into the insertion part over the entire length. In the endoscope treatment instrument raising device that is inserted in a guide coil made of a wound coil so as to be movable back and forth in the axial direction, the wire diameter of the guide coil of the portion arranged outside the bending portion is set in the bending portion. It is formed thicker than the portion where it is placed.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows the overall configuration of the endoscope treatment instrument raising apparatus. A large number of node rings can be tilted with rivets in the vicinity of the distal end of the flexible insertion portion 1 covered with a flexible tube. A curved portion 1a having a connected skeleton structure is formed.

  The distal end portion 2 where the observation window and the illumination window are arranged is connected to the distal end portion of the bending portion 1a (that is, the most distal portion of the insertion portion 1), and protrudes outward from the distal end portion main body 2. A treatment instrument raising piece 3 for changing the protruding direction of the distal end portion 100 a of the treatment instrument 100 is movably disposed on the distal end portion body 2. The treatment instrument 100 is inserted into and removed from a treatment instrument insertion channel that is inserted and disposed over the entire length in the insertion portion 1.

  A bending portion operation knob 5 for remotely bending the bending portion 1a is arranged on the operation portion 4 connected to the base end of the insertion portion 1, and by operating the bending portion operation knob 5, As shown by a two-dot chain line in FIG. 2, the bending portion 1a can be bent in an arbitrary direction by an arbitrary angle.

  Further, when the raising piece operation lever 6 disposed in the operation unit 4 is operated, the raising piece operation wire 11 is operated to advance and retreat in the axial direction, and the treatment instrument raising piece 3 is driven. The protruding direction of the distal end portion 100a of the treatment instrument 100 can be arbitrarily changed. The raising piece operation wire 11 is inserted and disposed in a guide coil 12 formed of a tightly wound coil that is inserted and disposed in the insertion portion 1 over the entire length thereof so as to be movable back and forth in the axial direction.

  FIG. 1 shows the vicinity of the distal end of the insertion portion 1. The treatment instrument raising piece 3 and the raising piece drive arm 7 are integrally connected via the shaft portion 8, with the shaft portion 8 as the center. It arrange | positions in the front-end | tip part body 2 so that rotation is possible.

  The distal end of the raising piece operation wire 11 is connected to the raising piece drive arm 7, and the raising piece drive arm 7 is rotationally driven by the advancement / retraction operation of the raising piece operation wire 11, and the treatment instrument is raised integrally therewith. The upper piece 3 rotates, and the protruding direction of the distal end portion 100a of the treatment instrument 100 that has passed through the treatment instrument insertion channel 9 changes. Such a configuration is a known one described in, for example, JP-A-8-56900.

  In this embodiment, the guide coil 12 includes a portion 12A having a thin wire diameter disposed in the bending portion 1a and a portion 12B having a large wire diameter disposed outside the bending portion 1a. It is formed by being connected in the vicinity of the rear end of the curved portion 1a.

  FIG. 3 illustrates a connecting portion formed in the middle of such a guide coil 12, and the portion 12A having a thin wire diameter disposed in the bending portion 1a has a wire diameter of 0.15, for example. A portion 12B having a large strand diameter formed by tightly winding a stainless steel wire of about 0.3 mm around a diameter (inner diameter) of about 0.3 to 0.6 mm and disposed outside the curved portion 1a is, for example, A stainless steel wire having a strand diameter of about 0.25 to 0.4 mm is tightly wound around the same diameter (inner diameter) as the portion 12A having a narrow strand diameter.

  Then, the thin wire portion 12A and the thick wire portion 12B are connected and fixed to the connecting cylinder 12C made of, for example, stainless steel by silver brazing or the like, and the tip of the thin wire wire portion 12A. The portion is fixed to the distal end portion main body 2, and the proximal end portion of the portion 12 </ b> B having a large strand diameter is fixed to the operation portion 4.

  With such a configuration, the portion 12A of the guide coil 12 disposed in the bending portion 1a has a thin wire diameter, so that when the bending portion 1a is operated to bend, there is no great resistance to it, and the built-in portion There is no pressure on the object to damage it.

  The portion 12B of the guide coil 12 arranged outside the curved portion 1a has a large wire diameter and thus has a strong waist. Therefore, a treatment tool having a strong waist is used and the amount of traction force of the raising piece operation wire 11 is used. 6 does not become a wavy state as shown in FIG. 6, and as a result, the pulling stroke of the raising piece operating wire 11 is secured, and the distal end portion 100a of the treatment instrument 100 is sufficiently secured. Can be raised.

  In addition, this invention is not limited to the said Example, For example, as FIG. 4 shows, the thin wire | line diameter part 12A and the thick part 12B of the guide coil 12 are made into the wire diameter of one strand. 12C can be omitted if the manufacturing process is changed in the middle.

It is side surface sectional drawing near the front-end | tip of the insertion part of the endoscope of 1st Example of this invention. 1 is a side view illustrating an overall configuration of an endoscope according to a first embodiment of the present invention. It is side surface sectional drawing of the connection part of the guide coil of the treatment tool raising apparatus of the endoscope of 1st Example of this invention. It is side surface sectional drawing of the connection part of the guide coil of the treatment tool raising apparatus of the endoscope of 2nd Example of this invention. It is side surface sectional drawing of the connection part of the guide coil of the treatment tool raising apparatus of the conventional endoscope. It is side surface sectional drawing of the connection part of the guide coil in the use condition of the treatment tool raising apparatus of the conventional endoscope.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insertion part 1a Bending part 2 Tip part main body (the most advanced part of an insertion part)
DESCRIPTION OF SYMBOLS 3 Treatment tool raising piece 4 Operation part 7 Raising piece drive arm 9 Treatment tool insertion channel 11 Raising piece operation wire 12 Guide coil 12A The thin part of the wire diameter arrange | positioned in the bending part 12B It arrange | positions out of a bending part 12C connecting cylinder 100 treatment tool 100a tip portion

Claims (1)

A bending portion that is bent by a remote operation from the proximal end side of the insertion portion is formed near the distal end of the flexible insertion portion, and a treatment instrument raising piece for changing the protruding direction of the treatment instruments is inserted into the insertion portion. A raising piece operating wire, which is movably disposed at the most distal portion of the section and is remotely operated from the proximal end side of the insertion section to drive the treatment instrument raising piece, extends over the entire length in the insertion section. In a treatment instrument raising device for an endoscope, which is inserted and arranged so as to be movable back and forth in the axial direction in a guide coil composed of a closely wound coil that is inserted and arranged,
By changing the wire diameter of the guide coil at the rear end position of the bending portion, the wire diameter of the guide coil in the entire region of the portion arranged outside the bending portion is arranged in the bending portion. A treatment instrument raising device for an endoscope, wherein the device is formed thicker than the wire diameter of the guide coil in the entire area of the portion.

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