JPH0446730Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to endoscopic treatment tools such as biopsy forceps and grasping forceps used with an endoscope.

[Conventional technology]

Endoscopic treatment tools, such as biopsy forceps, were developed in 1977.
As disclosed in Japanese Patent No. 11757, it has a pair of biopsy cups connected to a wire connector via a pantograph mechanism. and,
The biopsy cup is opened and closed via the pantograph mechanism by pushing and pulling an operating wire connected to the wire connector at the operating section on the hand side.

However, in this type of biopsy forceps, the inner hole of the distal tip member on which the wire connector slides is made small to the extent that sliding thereof is not impaired. For this reason, the length from the tip of the biopsy cup to the rear end of the distal tip member is a hard portion that hardly bends, and the length of this hard portion is large.

However, since the hard tip has a large length,
When this is inserted into the insertion channel of the endoscope, if the insertion channel curves, the biopsy cup or the rear end of the distal tip member presses against the inner wall of the insertion channel and comes into sliding contact with strong rubbing. Moreover, in the case of a sharp curvature, it gets caught on the inner wall of the insertion channel, making insertion difficult or impossible.
At this time, if you try to force it through, the insertion channel may be damaged or deformed, and other stored items, especially the optical fiber bundle, may be pressed and broken.

Therefore, in the device disclosed in Japanese Utility Model Application No. 58-136105, the shaft pin that pivotally supports the link of the pantograph mechanism is fitted into a shaft hole large enough to allow movement of the shaft pin, so that the cup can swing.

[Problem that the invention attempts to solve]

In the cup disclosed in Japanese Utility Model Application No. 58-136105, the cup could not be opened and closed reliably as intended because the cup was unstable in its swinging motion. Further, since a large shaft hole is formed in the pivot portion of the link, the structure tends to be complicated and large. Moreover, since this tip is originally small, there are problems in that it is difficult to make it accurately.

The present invention was developed in view of the above-mentioned problems, and its purpose is to enable relatively stable opening and closing operations of the distal treatment section, to simplify and miniaturize the structure, and to provide an internal structure that is easy to manufacture. An object of the present invention is to provide a treatment instrument for an endoscope.

[Means and actions for solving problems]

In order to solve the above-mentioned problems, the present invention proposes that the distal side be moved from the proximal side between the movable member that operates the treatment section pivotally attached to the distal tip via a pantograph mechanism and the inner hole of the distal tip that guides the moving member. A large clearance was formed. This clearance allows the movable member to tilt, thereby allowing the treatment section and pantograph mechanism to tilt.

〔Example〕

1 to 3 show a first embodiment of the present invention.

The endoscopic treatment instrument of this embodiment is a biopsy forceps, and as shown in FIG. It consists of

The tip forceps section 3 is constructed as shown in FIG. That is, a cylindrical tip 5 having an inner hole 4 is attached and fixed to the tip of the sheath 1, and a slit 6 is formed in the tip 5 along its axial direction. A pair of biopsy cups 8, 8 as a treatment section are pivotally attached to both side wall portions 7, 7 in which the slit 6 is formed.
In other words, the proximal arms 9, 9 of the biopsy cups 8, 8 intersect in the middle, and the pins 11 installed on both side walls 7, 7 pass through this intersecting portion, thereby supporting the biopsy cups 8, 8. Further, different links 12, 1 are provided at the rear ends of the base arms 9, 9, respectively.
One end of 2 is pivotally connected. Each link 12,
The other ends of the members 12 are collectively pivotally connected to a moving member 13, which will be described later. These base end arms 9, 9 and each link 12, 12 constitute a pantograph mechanism 14, and this pantograph mechanism 14 is disposed within the slit 6 of the distal tip 5. and,
By moving the moving member 13 back and forth, the pantograph mechanism 14 can be operated to open and close the biopsy cups 8, 8.

The movable member 13 has its proximal end portion 15 slidably inserted into the inner hole 4 of the distal tip 5. Furthermore, the distal end of an operating wire 16 inserted through the sheath 1 is connected to the moving member 13.

Further, as shown in FIG. 1, the proximal end portion 15 of the movable member 13 that is drawn into the inner hole 4 is formed in a tapered shape with a smaller diameter on the distal end side than on the proximal end side. Further, the inner hole 4 that guides the proximal end portion 15 of the moving member 13 has the same diameter over the entire length of the guide portion. As a result, a clearance 17 is formed between the inner hole 4 of the distal tip 5 and the proximal portion 15 of the moving member 13, which is larger on the distal side than on the proximal side.

On the other hand, the operation wire 16 is formed by twisting metal wires. This operating wire 16 is connected to the sheath 1
It is guided to the operating section 2 through the inside and connected to the slider 18 of the operating section 2. Then, by placing the thumb on the finger ring 20 provided on the main body 19 of the operating section 2 and placing the index finger and middle finger of the same hand on the slider 18 and moving the slider 18 back and forth, the operating wire 16 can be pushed and pulled. ing.

When using the biopsy forceps, the sheath 1 and the tip forceps portion 3 are passed through the insertion channel of the endoscope and introduced into the body cavity. The device is then operated under observation using an endoscope. That is, when opening the biopsy cups 8, 8, the slider 18 is pushed forward to advance the movable member 13 via the operating wire 16, and the pantograph mechanism 14 can be operated. Furthermore, when the biopsy cups 8, 8 are closed, if the slider 18 is moved backward, the operation wire 16 similarly pulls the movable member 13 backward, and the pantograph mechanism 14 is operated to close the biopsy cups.

On the other hand, when the biopsy forceps are inserted into the insertion channel of the endoscope, the biopsy cups 8, 8, the pantograph mechanism 14, and the movable member 13 are attached to the sheath 1 in the straight section of the insertion channel, as shown in FIG. It is in a straight line along the axial direction.

Further, when the insertion channel of the endoscope is curved, the inner wall of the insertion channel applies a force A shown by the arrow in FIG. 3 to the distal end cups 8, 8. In particular, when the curved tube part of the endoscope insertion part is forcibly curved, the amount of curvature is large.
The above power is also great.

By the way, the inner hole 4 of the tip 5 and the moving member 1
Since a clearance 17 is formed between the proximal end portion 15 of 3 and the distal end side is larger than the proximal end side,
When the force A is applied, the moving member 13 and the pantograph mechanism 14 tilt, and the biopsy cups 8, 8
is tilted in the opposite direction, and the entire shape approaches the curve of the insertion channel. Therefore, it can be easily inserted along the insertion channel.

Further, in this embodiment, even when the biopsy cups 8, 8 are opened, the proximal end portion 1 of the movable member 13
The rear end of the proximal end portion 15 remains within the inner hole 4, and since the rear end diameter of the proximal end portion 15 is the largest and approximately equal to the diameter of the inner hole 4, it does not move significantly within the inner diameter 14. Therefore, it is possible to prevent the biopsy cups 8, 8 from wobbling as much as possible. Therefore, it is easy to set a target for a target site, and biological tissue can be reliably collected.

FIG. 4 shows a second embodiment of the present invention.

In this embodiment, instead of forming the outer periphery of the proximal end portion 15 of the movable member 13 in a tapered shape, the inner hole 4 is formed in a tapered shape with a larger diameter on the distal end side than on the proximal end side to form a clearance 17. be. Other configurations and operations are the same as in the first embodiment.

FIG. 5 shows a third embodiment of the present invention.

In this embodiment, both the outer periphery of the proximal end portion 15 of the movable member 13 and the inner hole 4 are tapered to form a clearance 17. In other words, the first
This method incorporates the method of the second embodiment and the method of the second embodiment. Other configurations and the like are the same as those of the above embodiment.

[Effect of idea]

As explained above, according to the present invention, the distal treatment section and the pantograph mechanism section can be bent along the insertion channel through which they pass, which not only improves the ease of insertion, but also allows the distal treatment section to be relatively Can be operated stably. Furthermore, the structure of the tip portion can be simplified and miniaturized, and manufacturing is also facilitated.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view showing the main parts near the tip of the first embodiment, FIG. 2 is a side view of the entire biopsy forceps, and FIG. 3 is a side view showing the main parts near the tip of the biopsy forceps. 4 is a side sectional view showing the main parts near the tip of the second embodiment, and FIG. 5 is a sectional view of the third embodiment.
FIG. 3 is a side sectional view showing the main parts near the tip in the embodiment. DESCRIPTION OF SYMBOLS 1... Sheath, 4... Inner hole, 5... Distal tip, 8... Biopsy cup, 13... Moving member, 14
... Pantograph mechanism, 15 ... Proximal end portion, 1
7...Clearance.

Claims (1)

[Scope of utility model registration request] a sheath through which the operating wire is inserted; a distal tip provided with an inner hole through which a movable member attached to the distal end of the sheath and which connects the distal end of the operating wire is slidably inserted; a treatment section that can be opened and closed; a pantograph mechanism whose distal end is connected to the treatment section and whose rear end is connected to the movable member; An endoscopic treatment instrument characterized by having a clearance.