JP3068691B2 - Endoscope tip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an endoscopic device in which the distal end of a treatment instrument insertion passage for inserting a puncture needle for an endoscope is formed by obliquely opening the distal end of an endoscope insertion portion. It relates to the tip of an endoscope.

[0002]

2. Description of the Related Art In the case of a so-called oblique type endoscope in which the observation direction is obliquely forward, the opening direction of the treatment instrument insertion passage is formed obliquely in accordance with the observation direction. Also, in the case of a so-called ultrasonic endoscope in which an ultrasonic probe is provided at the distal end of the insertion section, in order to avoid interference with the ultrasonic probe occupying a large space, the opening direction of the treatment instrument insertion passage is oblique. It is formed by bending.

Conventionally, the cross-sectional shape of the opening portion of such a treatment instrument insertion passage is formed to be substantially the same circular shape as the cross-sectional shape in the middle of the treatment instrument insertion passage.

[0004]

A puncture needle for an endoscope such as an injection needle for an endoscope for injecting a medical solution or the like into an affected part in a body cavity is generally inserted into a treatment instrument insertion passage. The structure is such that the needle is taken in and out of the distal end of the mantle tube. In use, the distal end needs to be projected from the distal end opening of the treatment instrument insertion passage.

[0005] For this purpose, the end of the puncture needle for the endoscope with the needle must pass through the opening of the distal end of the treatment instrument insertion passage. However, since the needle portion is generally inflexible and straight, the length of the needle must be considerably short in order to pass the distal end portion of the treatment instrument insertion passage formed by being bent obliquely. However, there is a drawback that a puncture needle for an endoscope having a sufficient performance can not be used.

Therefore, the present invention uses a puncture needle for an endoscope having a long needle, even if the distal end of the treatment instrument insertion passage is opened obliquely at the distal end of the endoscope insertion portion. It is an object of the present invention to provide a distal end portion of an endoscope that can perform the operation.

[0007]

In order to achieve the above object, the distal end of the endoscope according to the present invention is configured such that the distal end of the treatment instrument insertion passage inserted through the endoscope insertion portion is connected to the endoscope. At the distal end of the endoscope, which is bent and opened in the oblique direction at the distal end of the insertion portion, the auxiliary groove having a width smaller than the width of the distal end portion of the treatment instrument insertion passage is formed from an angle direction gentler than the oblique direction. The endoscope is formed so as to be continuous with the distal end portion of the treatment instrument insertion passage, and the width of the auxiliary groove is inserted into the treatment instrument insertion passage so that the needle is inserted into and removed from the distal end of the outer tube. The mirror puncture needle is preferably formed to be thinner than the outer diameter of the outer tube and thicker than the outer diameter of the needle.

[0008]

An embodiment will be described with reference to the drawings. FIG. 5 shows an overall configuration of an ultrasonic endoscope, in which a distal end main body 1 is provided at a distal end of a flexible endoscope insertion section 20 inserted into a body cavity of a patient. On the distal end side of the endoscope insertion portion 20, a bending portion 21 that is bendable by remote control is formed.

At the proximal end of the endoscope insertion section 20, an operation section 3 is provided.
0 is linked. The operating section 30 includes a bending operation knob 31 for remotely controlling the amount of bending of the bending section 21, a treatment tool insertion port 3 a for inserting a treatment tool into the treatment tool insertion channel 3, an air supply nozzle 5, and a water supply nozzle 6. And a suction switch 33 for performing suction operation via the treatment instrument insertion channel 3 and the like.

Reference numeral 34 denotes a water injection port for sending deaerated water into the balloon 8 when the balloon 8 is attached to the distal end body 1. Reference numeral 35 denotes a suction line switching lever for switching the suction line between the treatment instrument insertion channel 3 and a drainage line (not shown) from the balloon 8.

An eyepiece 40 having a built-in eyepiece is protruded from the operation unit 30, and the base end of an image guide fiber bundle (not shown) is arranged at the observation position. Therefore, an optical image of the surface of the subject formed by the objective optical system in the distal end portion main body 1 can be observed through the eyepiece section 40.

Reference numeral 50 denotes a connector for connecting an incident end of a light guide fiber bundle for illumination (not shown) to a light source device, 51 is an air / water supply socket, 52 is a vent, 53 is a suction nipple, and 54 is a suction nipple. Functional ground terminal.

Reference numeral 60 denotes a processing circuit for performing electrical processing on the ultrasonic probe provided on the distal end body 1. 6
Reference numeral 1 denotes a CRT monitor for displaying and observing an ultrasonic tomographic image.

FIGS. 3 and 4 show the insertion section 2 of the ultrasonic endoscope.
0 shows the distal end body 1 formed at the distal end of the “0”. The distal end main body 1 is an objective side block 1a in which a front oblique observation objective optical system 2 for obtaining an optical image of the surface of the subject is built.
And an ultrasonic scanning unit 1b connected to the leading end thereof for transmitting and receiving ultrasonic waves to obtain an ultrasonic tomographic image of the subject.

2a is an observation window on the surface of the objective optical system 2,
The observation visual field range 2 b faces obliquely forward of the distal end portion main body 1. Note that the observation image formed by the objective optical system 2 is transmitted by the image guide fiber bundle, but a solid-state imaging device that electrically transmits an image may be used instead.

Reference numeral 4 denotes an illumination window provided to face the light emitting end of the light guide fiber bundle, and the observation field range 2b is illuminated by the illumination light emitted from the illumination window. Reference numerals 5 and 6 are an air supply nozzle and a water supply nozzle for ejecting air and water to the surface of the observation window 2a.

Reference numeral 7 denotes a water supply port for sending out degassed water for inflating the balloon 8 into the balloon 8 when the balloon 8 is attached to the distal end main body 1. Is formed with a drain port for discharging deaerated water. Reference numeral 9 denotes a ring for fixing an end of the balloon 8 to a recess formed in the distal end body 1.

The ultrasonic scanning section 1b is provided with a so-called convex type ultrasonic transmitting and receiving apparatus (hereinafter referred to as "ultrasonic probe") 11 formed in a convex shape.
The ultrasonic probe 11 is formed so as to scan the side of the distal end body 1 in a fan shape on a plane including the central axis of the distal end body 1. In this embodiment, an electronic scanning type ultrasonic probe is used as the ultrasonic probe 11, but a system that mechanically performs scanning may be used.

The object side block 1a of the distal end body 1 and the ultrasonic scanning section 1b are fitted and connected, and an O-ring 12 for sealing is attached to the connection portion. The watertightness is maintained. Reference numeral 13 denotes a fixing screw for fixing the object side block 1a and the ultrasonic scanning unit 1b.

FIG. 6 shows the vicinity of the distal end opening 3b of the treatment instrument insertion channel 3 in detail. Reference numeral 3c denotes a flexible tube having a circular cross-section that forms the treatment instrument insertion channel 3 over the entire length of the endoscope insertion section 20.

[0021] Tip opening 3b of treatment instrument insertion channel 3
Corresponds to the observation direction of the objective optical system 2,
An opening is formed obliquely forward in the object side block 1a.

From there, for example, the injection needle 1 for an endoscope
If the endoscope treatment tool such as 00 is protruded, the endoscope injection needle 100 is protruded into the observation visual field range 2b of the objective optical system 2 as shown in FIG. Can be. In addition, the treatment tool insertion channel 3 is also used as a suction channel for sucking and discharging dirty liquid and the like.

The distal end of the flexible tube 3c is connected and fixed to a connecting pipe 3d formed by smoothly bending a stainless steel pipe, and the connecting pipe 3d is located behind the objective side block 1a via a connecting auxiliary pipe 3e. It is connected and fixed to the end.

The auxiliary connection pipe 3e has an inner diameter smaller than the inner diameter of the connecting pipe 3d. As shown in FIG. 2, the lower side (the side closer to the center of the distal end body 1) has the inner diameter. It is cut off to a width of close dimensions.

The distal end opening 3b of the treatment instrument insertion channel 3 which opens diagonally forward is a hole having a circular cross-section formed in the objective side block 1a of the distal end body 1.
The inner diameter of the treatment instrument for the endoscope such as the injection needle 100 for the endoscope is larger than the outer diameter.

However, continuous with the tip opening 3b,
As shown in FIG. 1, an auxiliary groove 10 having a width A smaller than the width of the distal end opening 3b is formed. This auxiliary groove 10
As shown in FIG. 6, it is formed at a gentler angle than the distal end opening 3b with respect to the axial direction of the distal end body 1, and the bottom 10a of the auxiliary groove 10 is straight inside the flexible tube 3c at the back. Is formed in the direction to reach. Thus, the distal end opening 3b of the treatment instrument insertion channel 3 is
The auxiliary groove 10 has a width A and is fan-likely expanded downward.

The endoscope injection needle 100 used by being inserted into the treatment instrument insertion channel 3 is a flexible outer tube 1.
The needle 102 is formed so that the needle 102 can be taken in and out of the tip of the device 01 by remote control. And the width A of the auxiliary groove 10
Is formed thinner than the outer diameter of the mantle tube 101 and thicker than the outer diameter of the needle 102.

Therefore, the outer tube 101 of the injection needle 100 for an endoscope cannot enter the auxiliary groove 10,
By protruding 02 from the mantle tube 101, only the needle 102 can pass through the auxiliary groove 10.

In order for the endoscope injection needle 100 to protrude from the end of the endoscope thus formed, first, the needle 10
2 is retracted into the mantle tube 101, and as shown in FIG. 7, the mantle tube 101 is inserted into the treatment instrument insertion channel 3 to a position where the mantle tube 101 is fitted to the bent portion of the joint tube 3d.

Then, the needle 102 is inserted into the mantle tube 10 at that position.
If it protrudes from 1, the needle 102 will protrude straight into the auxiliary groove 10 as shown in FIG. Therefore,
Even if the needle 102 is very long, if the needle 102 is pushed out as much as possible at that position, the part of the needle 102
Pass through the bent part of.

Next, when the mantle tube 101 is pushed into the treatment instrument insertion channel 3 from the hand side in this state, as shown in FIG. 9, the mantle tube 101 passes through the bent portion of the joint tube 3d without resistance. , Distal opening 3 of treatment instrument insertion channel 3
b, projecting forward from the needle 10
2 can be pierced.

The present invention is not limited to an ultrasonic endoscope but can be widely applied to general endoscopes. Further, the term “oblique” in this specification includes an angle larger than a right angle, a right angle, and the like.

[0033]

According to the distal end portion of the endoscope of the present invention, when the puncture needle for an endoscope is inserted into the treatment instrument insertion passage, only the needle is first projected from the auxiliary groove, and the needle is projected. Later, since the outer tube can be protruded from the distal end opening of the treatment instrument insertion passage, even if the distal end of the treatment instrument insertion passage is formed obliquely and opened, a puncture needle for an endoscope having a long needle can be used. It has an excellent effect that it can be used without any hindrance, so that a puncture needle for an endoscope having sufficient performance can be used.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment (a sectional view taken along line II in FIG. 6).
It is.

FIG. 2 is a sectional view of the embodiment (a sectional view taken along line II-II in FIG. 6).
It is.

FIG. 3 is a side view of a distal end portion of the ultrasonic endoscope according to the embodiment.

FIG. 4 is a plan view of a distal end portion of the ultrasonic endoscope according to the embodiment.

FIG. 5 is an overall perspective view of the ultrasonic endoscope of the embodiment.

FIG. 6 is a partially enlarged side sectional view of the embodiment.

FIG. 7 is a partial side sectional view showing a use state of the embodiment.

FIG. 8 is a partial side sectional view showing a use state of the embodiment.

FIG. 9 is a partial side sectional view showing a use state of the embodiment.

[Description of Signs] 1 distal end body 3 treatment instrument insertion channel 3b distal end opening 10 auxiliary groove 20 endoscope insertion section

Claims (2)

(57) [Claims] 1. A distal end portion of an endoscope, wherein a distal end of a treatment instrument insertion passage inserted and disposed in an endoscope insertion portion is bent obliquely at the distal end portion of the endoscope insertion portion and opened. A distal end of an endoscope, wherein an auxiliary groove having a width smaller than the width of the distal end portion of the treatment instrument insertion passage is formed continuously from the oblique direction to the distal end portion of the treatment instrument insertion passage from a gentler angle direction than the oblique direction. Department. 2. A width of the auxiliary groove is smaller than an outer diameter of the outer tube of the puncture needle for an endoscope which is inserted into the treatment instrument insertion passage and used by inserting and removing a needle from a distal end of the outer tube. 2. The distal end portion of the endoscope according to claim 1, wherein the distal end portion is formed thicker than the outer diameter of the needle.