JPS63230143A - Endoscope - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an endoscope that is provided with an elevator at the distal end component of the insertion section.

[Prior art]

Conventionally, in an endoscope in which an elevating table for elevating a treatment instrument is pivotally attached to the distal end component of the insertion portion, for example,
As seen in Japanese Patent No. 01, a manipulation wire is connected to a lifting table, and the raising table is rotated via the operating wire, thereby raising the treatment instrument.

By the way, the above-mentioned operating wire passes through an insertion hole provided in the distal end component, is guided into the curved part of the distal end of the insertion section, and from there is guided through the flexible tube section of the insertion section to the operating section on the proximal side. In order to reduce the amount of lifting force of the elevator, the outward opening of this insertion hole is located at a position spaced apart in the radial direction of the tip component from the pivot point of the elevator, that is, on the outer circumferential side of the tip component. It is located at a biased position. A guide tube is connected to the opening on the insertion section side of this insertion hole.
The operating wire led out into the curved section or flexible tube section passes through this guide tube and is guided to the operating section.

[Problem that the invention seeks to solve]

However, in the case of this configuration, since the insertion hole itself is biased toward the outer circumference side of the distal end component, the guide tube is also inserted at a position close to the curved portion or the inner circumference of the flexible tube portion.

For this reason, if the guide tube is provided parallel to the center line of the insertion section, for example, when the curved section is curved, the guide tube will interfere with the inner surface of the curved section and be bent suddenly.
There is a risk of buckling.

To avoid interference between this curved part and the guide tube,
Increasing the diameter of the curved part, or making the insertion hole slope toward the center line of the insertion part as it advances toward the guide tube, and aligning the end of the guide tube that connects to this insertion hole with the inclination of the insertion hole. It is conceivable to provide the guide tube at an angle and pass the guide tube through a position close to the center of the insertion section.

However, when the diameter of the curved part is increased, the outer diameter of the tip of the insertion part becomes thicker, making it difficult to insert it into the body cavity.
There is a problem that causes more pain to the patient.

Furthermore, if the insertion hole is provided at an angle, the outward opening of the insertion hole will be shifted radially outward of the tip component, making it necessary to increase the diameter of the tip component. Similarly, the diameter of the tip of the insertion portion becomes thick, making it difficult to insert it into the body cavity.

At the same time, when the insertion hole is tilted, the periphery of the outward opening becomes sharply pointed, and the operating wire tends to come into contact with the periphery of the opening, causing problems such as premature wear of the operating wire. .

The present invention was made based on these circumstances, and
The purpose of the present invention is to provide an endoscope that can prevent buckling of the guide tube without increasing the diameter of the distal end component, allows smooth raising of the elevator platform, and allows easy insertion into body cavities. shall be.

[Means for solving problems]

Therefore, in the present invention, an elevator for raising a treatment instrument is pivotally attached to the tip component, an operating wire is connected to the elevator, and the operating wire is guided through the tip component to the inside of the insertion section. A guide tube located inside the insertion section and through which the operating wire is inserted is connected to an open end of the insertion hole on the insertion section side, and the guide tube is connected to at least the insertion hole. In an endoscope in which the distal end of the side is inclined in the direction of the center line of the insertion portion as it moves away from the insertion hole, the axis of the insertion hole is set relative to the axis of the tip of the inclined guide tube. It is characterized in that it is provided inclined in the direction of the center line of the insertion portion.

[Effect]

According to this configuration, the distal end of the guide tube on the insertion hole side is inclined toward the center line of the insertion section, so that the guide tube is inserted through the portion closer to the center line of the insertion section by the amount of this inclination. will be done. Therefore, even if the guide tube is bent due to the curvature of the insertion section, the radius of curvature becomes large, and interference between the guide tube and the inner surface of the insertion section is reduced.

In addition, since the insertion hole is inclined toward the center line of the insertion section with respect to the guide tube, its outward opening is closer to the insertion section than when the insertion hole is located on the extension line of the guide tube. As a result, the diameter of the tip component does not become unnecessarily thick.

〔Example〕

The present invention will be explained below based on an embodiment shown in the drawings.

The endoscope indicated by reference numeral 1 in FIG. 7 includes an insertion section 2 inserted into a body cavity, and an operation section 3 connected to the proximal side of the insertion section 2. The operation section 3 includes an illumination light source (not shown). A light guide cable 4 connected to the device is connected.

The insertion section 2 has a tubular curved section 6 at the tip of the flexible tube section 5.
The tip forming portion 7 is connected via a pin 9, and the curved portion 6 is configured by connecting a plurality of ring-shaped curved portions 8 rotatably via a pin 9.

The curved part 8 located at the tip of the curved part 6 is connected to the angle knob 10 provided on the operation part 3 via four wires (not shown) on the upper, lower, left and right sides.
When 0 is rotated, the wire is selectively pulled, and the curved portion 6 is bent in any direction, up, down, left, or right using the pin 9 as a fulcrum.

As shown in FIG. 5, inside this insertion section 2, there are a channel 12 through which a treatment instrument 11 such as forceps is inserted, an image guide fiber 13, a light guide fiber 14, and an air/water supply pipe 15. The channel 12 is connected to the forceps insertion port 1B provided in the operation section 3, and the image guide fiber 13, light guide fiber 14, and air/water supply pipe 15 are connected from the operation section 3 to the light guide. It is connected to an illumination light source device via a cable 4.

The tip structure part 7 is connected to a curved part 8 at the tip of the curved part 6, and a forceps outlet 17 is formed in this tip structure part 7, which is continuous with the channel 12 and allows the tip of the treatment instrument 11 to be led out. has been done. The area from the connecting portion of the distal end component 7 to the curved portion 8 to the outer periphery of the curved portion 6 is covered with a protective member 18 made of rubber, and this protective member 1B
The tip is fixed to the tip forming part 7 by tying it with a thread 19. Further, the outer periphery of the tip component 7 is covered with a cover 20 made of synthetic resin so as to be continuous with the protection member 18, and an opening 22 that is continuous with the forceps outlet 17 is formed at the side of the tip of this cover 20. ing.

As shown in FIG.
7, an objective lens 23 connected to the image guide fiber 13 and an illumination lens 24 connected to the light guide fiber 14 are installed, and an air/water supply nozzle 25 connected to the air/water supply pipe 15 is installed. This air/water supply nozzle 25 is provided so as to protrude into the opening 22 from the tip component 7 so as to be close to the objective lens 23 and the illumination lens 24 . In the case of this embodiment, the space between the air/water supply nozzle 25, the tip component 7, and the cover 20 is filled with a silicone adhesive 2G.

Further, the distal end component 7 is provided with an elevating table 28 for elevating the treatment instrument 11 led out from the forceps outlet 17. The raising table 2B is located at the tip of the forceps outlet 17, and one end thereof is pivotably supported via a pivot pin 29 in the insertion direction of the treatment instrument 11, that is, in the direction orthogonal to the axial direction of the insertion section 2. has been done. The tip of the operating wire 30 is connected to the rotating tip side of the raising table 28. The proximal end of the operating wire 30 is inserted through an insertion hole 31 provided in the distal end component 7 and guided into the curved portion 6, from where it passes through the flexible tube portion 5 and then passes through the insertion hole 31 provided in the operating portion 3. It is connected to the upper lever 32.

Therefore, when the raising lever 32 is operated and the operating wire 30 is pulled, the raising table 28 is rotated about the pivot pin 29, and the treatment instrument 11 is raised at a predetermined angle.

The insertion hole 31 through which the operation wire 30 is inserted is connected to the raising table 28.
The distance A is provided at a distance A in the radial direction of the tip component 7 from the pivot point of the elevator 28, and this distance A is set at a distance A between the elevator 28 and the operating wire 30 in order to reduce the amount of lifting force of the elevator 28. It is set to be equal to or greater than the distance B from the point to the pivot point.

For this reason, the insertion hole 31 is provided at a position biased toward the outer circumferential side of the distal end component 7, and an outward opening 31a of the insertion hole 31 is widened in a tapered shape.

Further, a wire guide tube 34 connected to the insertion hole 31 is soldered to the end surface 7a of the tip component 7 on the side of the curved portion θ, and the end of this wire guide tube 34 is led out into the curved portion B. There is. A flexible guide tube 35 is coaxially connected to the lead-out portion of the wire guide tube 34, and the wire guide tube 34 and the guide tube 35 are tied with a thread 36 and bonded with an adhesive (not shown). By doing so, they are integrally fixed to each other. The guide tube 35 is provided over the entire length of the flexible tube section 5 from the curved section 6, and the operating wire 3 is guided through the guide tube 35.
1 is inserted and arranged.

Note that the outer periphery of the guide tube 35 is covered with a protective sheath 37.

By the way, the wire guide tube 34 that connects the insertion hole 31 and the guide tube 35 is inclined in a direction that approaches the center line X1 of the insertion section 2 as it goes away from the insertion hole 31, and therefore The side ends are also inclined in a direction approaching the center line X□. In addition, the insertion hole 3
1, the axis X2 thereof is inclined at a certain angle α in the force direction of the center line X of the insertion portion 2 with respect to the axis X3 on the distal end side of the inclined guide tube 35. In this case, the axis X2 of the insertion hole 31 is provided approximately parallel to the center line X1 of the insertion portion 2 (the distal end portion 7).

An adjustment screw 38 is screwed into the end surface 7b of the tip structure portion 7 on the opening 22 side, and comes into contact with the rotating tip surface 28a of the elevator 28 when the elevator 28 is raised.
By increasing or decreasing the screwing amount of the adjustment screw 38, that is, the amount of protrusion from the end surface 7b of the tip component 7, the raising angle of the raising table 28 can be adjusted.

In such a configuration, when the curved portion 6 is curved as shown in FIG. 2, the guide tube 35 will be bent due to the contact between the curved portion 8 and the protective sheath 37.

At this time, if the guide tube 35 is provided parallel to the center line x1 of the insertion section 2 as in the conventional case shown by the imaginary line in FIG. Since the distance between them is short, the guide tube 35 is bent sharply with a small curvature.

In contrast, the guide tube 35 is aligned with the center line of the insertion section 2
If the guide tube 35 is provided tilted in the force direction, the guide tube 35 is passed through a portion closer to the center line X□ by the amount of this tilt, so that the distance between the guide tube 35 and the curved portion 8 becomes larger. Therefore, even if the guide tube 35 is bent due to contact with the curved portion 8, the radius of curvature becomes large, so interference between the guide tube 35 and the curved portion 8 is reduced, and the seat of the guide tube 35 is bending is prevented.

In addition, since the insertion hole 31 of the distal end component 7 is provided approximately parallel to the center line Compared to the case where the opening 31a to the outside is
can be arranged closer to the center line x1 by a certain distance, and the outer diameter of the tip forming portion 7 can be made thinner by that amount.

Therefore, buckling of the guide tube 35 can be prevented without increasing the diameter of the distal end component 7 or the curved part 6, so that when the raising table 28 is raised, there is no catch, and the raising Of course, it allows for smooth operation,
It can also be easily inserted into body cavities.

Further, according to the above configuration, the peripheral edge of the opening 31a of the insertion hole 31 does not become sharply sharp, and the operating wire 30 is less likely to come into contact with this peripheral edge, which has the advantage of preventing wear of the operating wire 30.

Note that the axis of the insertion hole does not necessarily need to be provided parallel to the center line of the insertion portion, and may equally well be inclined slightly inward or outward in the radial direction of the distal end component.

〔Effect of the invention〕

According to the present invention described in detail above, buckling of the guide tube can be prevented without increasing the diameter of the distal end component, so the raising operation of the elevator can be performed easily and smoothly, and the insertion into the body cavity can be easily performed. It also has the advantage of being easy to perform and causing less pain to the patient.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view of the tip of the insertion section, FIG. 2 is a sectional view of the tip of the insertion section in a curved state, and FIG. 3 is a sectional view of the opening of the insertion hole. 4 is a plan view of the distal end component, FIG. 5 is a sectional view of the curved part, FIG. 6 is a sectional view taken along line VI-VI in FIG. 4, and FIG. 7 is a perspective view of the endoscope. It is a diagram. DESCRIPTION OF SYMBOLS 1... Endoscope, 2... Insertion part, 7... Tip structure part, 11... Treatment instrument, 28... Elevating table, 30... Operation wire, 31... Insertion hole , 35... guide tube. Applicant's representative Patent attorney Jun Tsuboi Figure 2 Figure 3 Figure 4 Figure 5 Figure 2 (J Figure 6 Figure 7

Claims (1)

[Claims] An elevator for raising the treatment instrument is pivotally connected to a tip component located at the tip of the insertion section, an operating wire is connected to the elevator, and an operating wire is connected to the tip component. An insertion hole is formed through which the operating wire is inserted and guided inside the insertion section, and a flexible guide tube, which is located inside the insertion section and through which the operating wire is inserted, is provided at the open end of the insertion hole on the insertion section side. In an endoscope in which at least the distal end of the guide tube on the side connected to the insertion hole is inclined in the direction of the center line of the insertion portion as it moves away from the insertion hole, the axis of the insertion hole is What is claimed is: 1. An endoscope, characterized in that the endoscope is provided tilted in the direction of the center line of the insertion section with respect to the axis of the distal end side of the guide tube.