JPH0438806Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an endoscope equipped with an elevating device section for elevating a treatment tool such as forceps that is introduced into a body cavity through an insertion channel.

[Conventional technology]

Generally, an endoscope is provided with a channel through which a treatment instrument is inserted, and a treatment instrument such as forceps or a catheter is introduced into a body cavity through this channel. A storage chamber that communicates with the channel and opens to the outside is provided at the distal end of the insertion section, and this storage chamber stores an inductor for regulating the direction in which the treatment tool is guided into the body cavity.
FIG. 7 shows an example. That is,
A base end of an elevator 1 serving as an inductor for regulating the direction in which the treatment instrument is led out into the body cavity is pivotally connected to a shaft 3 at the bottom of the storage chamber 2 . The elevating table 1 is rotated by a elevating operation wire 4 led out from a side portion of the elevating table 1. Further, the elevator 1 is guided in sliding contact with the left and right wall surfaces 5 and 6 of the storage chamber 2, and is designed to rotate stably substantially in the vertical direction.

[Problem that the invention attempts to solve]

However, as shown in FIG. 7, the height H1 of the left wall surface 5 on the side from which the lifting operation wire 4 is led out is relatively low, and therefore a relatively large space 7 is formed. When attempting to lead out the treatment instrument 8 for this large space 7, as shown in FIG.
The tip of the wire sometimes entered the space 7 and got caught in the lifting operation wire 4.

Therefore, in order to eliminate this hit, it is possible to extend the height H1 of the left side wall surface 5 to just below the lifting operation wire 4, but if this is done, the area of the wall surface 5 becomes large and The frictional resistance with the upper table 1 is increased proportionally. As a result, the amount of operating force applied via the elevating operation wire 4 increases significantly.In the endoscope, the elevating operation wire 4 is guided from the operating section through a guide formed inside the elongated insertion section. Since the frictional force is also quite large and the amount of operating force is originally large, it is practically impossible to do the above-mentioned method that further impairs the operability, that is, to extend the height H1 of the left side wall surface 5 to just below the lifting operation wire 4. .

This invention was made with attention to the above circumstances,
The purpose is to provide an endoscope that has a simple configuration, does not impair operability, and can prevent the treatment instrument from getting caught on the operating wire.

[Means and actions for solving problems]

In order to solve the above problems, the present invention provides a storage chamber in which a treatment instrument guide is installed in the distal end component of the insertion section, and the treatment instrument guide installed in this storage chamber is rotated by an operating wire. In an endoscope that controls the guiding direction of a treatment instrument introduced through a treatment instrument insertion channel by The side wall of the storage chamber that is close to and opposite to the side surface of the treatment instrument guide located on the side through which the operation wire passes, has a side surface on the operation wire side facing the operation wire, and a part of the side wall is used to guide the treatment instrument. It is formed as a retractable surface portion that does not come into sliding contact with the side surface of the child.

Therefore, even if the side wall in the storage chamber that is close to and faces the side surface of the treatment instrument guide is formed sufficiently high, a retraction surface portion that does not come into sliding contact with the side surface of the treatment instrument guide is formed in a part of the side wall. , the sliding friction force during rotation of the treatment instrument guide can be reduced.

Furthermore, it is possible to avoid as much as possible the formation of a large space on the wall surface on the operation wire side of the storage chamber in which the treatment instrument guide would get stuck and become stuck.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. Reference numeral 10 in FIGS. 1, 2, and 3 indicates the distal end component of the insertion section of the endoscope. The tip component 10 is formed by fitting a resin cover 12 onto a metal body 11, and an opening 14 is formed on the upper surface of the cover 12 in correspondence with the flat surface 13 of the body 11.
is provided. As shown in FIG. 4, an observation window 15 and an illumination window 16 are formed on the flat surface 13 of the main body 11 along the axial direction of the insertion section. Further, on the sides of the observation window 15 and the illumination window 16, an elongated storage chamber 17 is formed along the longitudinal direction of the insertion portion. As shown in FIG. 2, this storage chamber 17 has an observation window 15 on its opening 18 side.
and is leaning toward the lighting window 16 side.

A treatment instrument guide 19 is housed inside this storage chamber 17, and the proximal end of the treatment instrument guide 19 is connected to the storage chamber 17 as shown in FIGS.
It is pivotally connected to a pivot shaft 21 provided at the bottom of the. The treatment instrument guide 19 is wide at its rotating tip when viewed from the side, and has a generally fan-like configuration. Further, the upper rear surface of the treatment instrument guide 19 is curved in an arc shape as shown in FIG. 1, and this surface has a guide groove 22 as shown in FIG.
is formed.

Furthermore, an attachment hole 23 is formed in the rotating tip side portion of the treatment instrument guide 19, and the tip of the operating wire 25 is attached to this attachment hole 23 via an attachment tool 24. The operating wire 25 is led out from one side of the treatment instrument guide 19, turned backward by 90 degrees, guided into the wire guide hole 26, and wire guide tube 27 etc. inserted into the insertion section. is guided to the operating section of the endoscope through the guide, and is connected to the raising operating mechanism. Then, the treatment instrument 28 is guided into the storage chamber 17 through a treatment instrument insertion channel 29 provided in the insertion section,
It is guided by a guide groove 22 of the treatment instrument guide 19 and led out from the mouth 18 . By pushing and pulling the operation wire 25 using the raising operation mechanism in the operation section, the treatment instrument guide 19 can be rotated, and the direction in which the treatment instrument 28 is led out can be changed.

Additionally, a storage chamber 17 for storing the treatment instrument guide 19 is provided.
As shown in FIG. 2, the left and right side walls 31 and 32 respectively closely face each side of the treatment instrument guide 19. Furthermore, the height H2 of the side wall 31 located on the left side of the side through which the operating wire 25 passes is relatively high, and the side wall 31 is placed so high as to be close to directly below the operating wire 25 and facing each other. In other words, the upper end surface 33 of the member forming the side wall 31 is formed into an arcuate shape, leaving a portion through which the operating wire 25 passes, so as to make the space 34 immediately below the operating wire 25 extremely small. Furthermore, a part of the side wall 31 located on the left side of the side through which the operation wire 25 passes, in this embodiment, a part located on the rotational outer side of the treatment instrument guide 19 slides into contact with the side surface of the treatment instrument guide 19. A retraction surface portion 35 is formed that does not cover the surface. As shown in FIG. 1, this retraction surface portion 35 is formed in an arc shape with a constant width around the rotation center of the treatment instrument guide 19. The remaining portion of the side wall 31 located inside the retraction surface portion 35 is formed as a sliding surface 36 that slides into contact with the side surface of the treatment instrument guide 19.

Furthermore, as shown in FIG. 1, a tip 37 made of Teflon is attached to the side surface of the treatment instrument guide 19 so as to lightly slide against the sliding surface 36 of the side wall 31. are doing. Also,
As shown in FIGS. 1 and 4, a stopper 38 that protrudes into the storage chamber 17 and hits the treatment instrument guide 19 to restrict the maximum lifting angle of the treatment instrument guide 19 is included in the member constituting the side wall 31. Member 3 having
9 is attached by screws 40.

FIG. 5 is a cross-sectional view of the insertion section immediately after the distal end component 10. FIG. In this part, the wire guide tube 27, the image guide fiber 41, the light guide fiber 42, the forceps channel 43, the air/water supply tube 44, etc. are arranged as shown in the figure. Arranged as shown. That is, in particular, the guide 45 following the wire guide tube 27, the air/water supply tube 44, etc. are arranged close to the center. Furthermore, a guide for a focus wire (not shown) for adjusting the focal length of the distal objective optical system is also placed at the center of the insertion section. In this way, even if the insertion section is curved, the forceps raising and focusing operations can be performed accurately without any influence.

By the way, as explained above, in the above structure, the height H2 of the side wall 31 that closely faces the side surface of the treatment instrument guider 19 located on the side through which the operation wire 25 passes
Since it is made sufficiently high, the space 34 directly under the operating wire 25 can be made extremely narrow. For this reason, the treatment instrument 28 that is raised and guided by the treatment instrument guide 19
It is possible to prevent the tip from entering this space 34 and being hit. In addition, since the retraction surface portion 35 that does not come into sliding contact with the treatment instrument guide 19 is formed on a part of the side surface of the side wall 31 that closely faces the side surface of the treatment instrument guide 19, the treatment instrument guide 19 can be easily moved even though it has an extremely simple configuration. 19 can be significantly reduced. Therefore, good operability of the treatment instrument guide can be ensured.

[Effect of idea]

As described above, according to the present invention, it is possible to provide an endoscope that has a simple configuration but can prevent the treatment instrument from getting caught on the operating wire without impairing operability.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the tip component in the first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the vicinity of the storage chamber in the first embodiment, and FIG.
4 is a partially cutaway plan view of the tip structure of the first embodiment, and FIG. 5 is a sectional view taken along line BB in FIG. 1. FIG. 6 is a vertical cross-sectional view of an intermediate portion of the insertion section rearward from the distal end component in the first embodiment, and FIG. 7 is a vertical cross-sectional view of the vicinity of the storage chamber in the conventional one. . 10...Tip component, 11...Main body, 17...
Storage chamber, 19... Treatment instrument guide, 25... Operation wire, 28... Treatment instrument, 31... Side wall, 34...
Space part, 35... Retreat surface part, 36... Sliding surface.

Claims (1)

[Claims for Utility Model Registration] A storage chamber in which a treatment instrument guide is installed is provided in the distal end component of the insertion section, and the treatment instrument guide installed in this storage chamber is rotated by an operating wire to perform treatment. In an endoscope that controls the guiding direction of a treatment instrument introduced through an instrument insertion channel, an operation wire connected to the treatment instrument guide is guided rearward from a side of the treatment instrument guide and passes through the operation wire. A side surface of the side wall of the storage chamber facing the operating wire, which is close to the side surface of the treatment instrument guide located on the side, is closely opposed to the operating wire;
An endoscope characterized in that a part of the side wall is formed as a retraction surface portion that does not come into sliding contact with the side surface of the treatment instrument guide.