JP2002301010A - Tip of endoscope with hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tip of an endoscope with hood enabling to be smoothly carried out with a forceps by fully opening the forceps inside of an end hood, without increasing the diameter of the tip of an insertion part. SOLUTION: Only the portion 3a of the end hood 3 closest to a treatment tool outlet 12 is shaped to bulge outwards, or only the interior wall surface of the portion 3a of the end hood 3 closest to the treatment tool outlet 12 is widened outwards and the end hood 3 is thinly formed only at the portion 3a. Alternatively, the portion 3a of the hood 3 closest to the treatment tool outlet 12 is formed of an elastic member while the other portion of the hood made of a member harder than the elastic member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope with a hood.

[0002]

2. Description of the Related Art In a forward-looking or forward-looking endoscope, in order to secure a distance between a mucosal surface, which is an object in the body, and an observation window, a cylindrical shape is provided forward from the outer periphery of a distal end body. In many cases, the tip hood is attached so as to protrude from the hood.

[0003]

However, when such a distal end hood is attached to a small-diameter endoscope as in recent years, for example, when the forceps are used at a short distance, the forceps are inserted in the distal end hood. When it is necessary to open the piece, a phenomenon occurs in which the forceps piece hits the inner wall of the hood and cannot be sufficiently opened, so that it is not possible to smoothly perform tissue collection, foreign matter grasping, and the like using the forceps.

[0004] To cope with this, if the diameter of the tip hood is increased, such inconvenience can be solved. However, since the insertion property is reduced, there is no point in reducing the diameter of the endoscope. .

Therefore, the present invention provides a hood-equipped endoscope with a forceps piece that can be sufficiently opened in a tip hood to perform a treatment with forceps without increasing the diameter of the tip of the insertion portion. The purpose is to provide.

[0006]

In order to achieve the above object, the distal end of the hooded endoscope according to the present invention comprises an outer periphery of a distal end main body having an observation window and a treatment tool outlet on the distal end surface. In the distal end portion of the hood-equipped endoscope to which the distal hood is attached so as to protrude forward from the portion in a cylindrical shape, only the portion of the distal hood closest to the treatment tool outlet is formed in a shape bulging outward, or , Only the inner wall surface of the portion of the tip hood closest to the treatment tool outlet is expanded outward, and the thickness of the tip hood is made thinner only at that portion, or the portion of the tip hood closest to the treatment tool outlet is elastic. The other part is formed by a member harder than the elastic member.

[0007]

Embodiments of the present invention will be described with reference to the drawings. FIG. 7 shows the entire configuration of the endoscope. A distal end main body 2 arranged at the distal end of the flexible tubular insertion portion 1 includes:
A cylindrical tip hood 3 is detachably attached.

The operating section 4 connected to the proximal end of the insertion section 1 has a treatment tool insertion opening 7 or the like which is an entrance to a treatment tool insertion channel inserted through the entire length of the insertion section 1. Is arranged.

FIGS. 1 and 2 show a distal end of a hooded endoscope according to a first embodiment of the present invention. FIG. 1 is a side sectional view, and FIG. It is the front view of the state seen from the front.

As shown in FIG. 2, an observation window 11 and a treatment tool outlet 12 are arranged side by side on a distal end surface 2a of the distal end body 2, and an illumination window 1 for illuminating an observation range.
3 are also arranged alongside them.

As shown in FIG. 1, an objective optical system 15 is arranged inside the observation window 11, and an imaging surface of a solid-state imaging device 16 is arranged at a position where the objective optical system 15 projects a subject. Reference numeral 17 denotes a signal cable for transmitting an imaging signal and the like. The distal end of a treatment instrument insertion channel (also serving as a suction tube) 18 is connected to the treatment instrument protrusion port 12 in communication.

The tip hood 3 is formed in a substantially cylindrical shape by a transparent hard plastic material, and is detachably attached to the tip end main body 2 by an elastic connecting cylinder 30 integrally connected to the rear half thereof. Attached to. 3
Reference numeral 1 denotes an engagement portion for preventing the tip hood 3 from rotating with respect to the tip portion main body 2.

The connecting cylinder 30 is provided so as to elastically tighten a circumferential groove 2b formed on the outer peripheral surface of the distal end main body 2, whereby the distal end hood 3 is attached to the distal end main body 2. It has become. And the connecting cylinder 30
Is elastically deformed and removed from the circumferential groove 2b.
Is removed from the distal end body 2.

In the distal end hood 3 configured as described above, only the portion 3a closest to the treatment tool outlet 12 is formed in a shape bulging outward, and the portion 3a has an inner periphery as shown in FIG. Both the surface and the outer peripheral surface bulge outward in a smooth arc shape, and are formed to have the same thickness as the other portions.

The center position of the arc is substantially at the treatment tool outlet 1.
2 and the opening width (half width) of the forceps piece 101 in any direction from the axial position of the treatment tool outlet 12.
A larger distance R is ensured between the treatment tool outlet 12 and the tip hood 3.

Therefore, as shown in FIG. 1, when it is necessary to perform a treatment at a short distance through the forceps 100 through the treatment tool insertion channel 18, the forceps piece 101 is not interfered with the tip hood 3, and Inside, and the intended treatment can be performed smoothly. Since the tip hood 3 is only locally expanded, the pain given to the patient when the endoscope is inserted into the body hardly increases.

FIGS. 3 and 4 show a distal end portion of a hooded endoscope according to a second embodiment of the present invention. Only the inner wall surface of a portion 3a of the distal end hood 3 closest to the treatment instrument outlet 12 is shown. Is spread outward in the same manner as in the first embodiment, and the thickness of the tip hood 3 is formed thinner only at the portion 3a.

By doing so, the forceps piece 101 can be opened in the distal hood 3 without interfering with the distal hood 3 without increasing the pain given to the patient when inserted into the body. The configuration of the other parts is the same as that of the first embodiment.

FIGS. 5 and 6 show a distal end portion of an endoscope with a hood according to a third embodiment of the present invention. Only the closest portion 3a is formed by an elastic member.

By doing so, the tip hood 3
When the forceps piece 101 opened inside interferes with the tip hood 3, the tip hood 3 (3a) as shown by a solid line in FIG.
Since the side is elastically deformed, the forceps piece 101 can be easily opened. The configuration of the other parts is the same as that of the first embodiment.

[0021]

According to the present invention, only the portion of the distal end hood closest to the treatment tool outlet is formed in a shape bulging outward, so that the diameter of the distal end of the insertion portion is not increased.
The forceps piece is sufficiently opened in the distal end hood, so that the treatment with the forceps or the like can be performed smoothly. In addition, only the inner wall surface of the portion of the distal end hood closest to the treatment instrument outlet is expanded outward to reduce the thickness of the distal end hood only at that portion, or the portion closest to the treatment instrument outlet is an elastic member. The same effect can be obtained by forming the same.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a distal end portion of an endoscope with a hood according to a first embodiment of the present invention.

FIG. 2 is a front view of a distal end surface of a distal end body of a distal end portion of the endoscope with a hood according to the first embodiment of the present invention.

FIG. 3 is a side sectional view of a distal end portion of an endoscope with a hood according to a second embodiment of the present invention.

FIG. 4 is a front view of a distal end surface of a distal end body of a distal end portion of an endoscope with a hood according to a second embodiment of the present invention.

FIG. 5 is a side sectional view of a distal end portion of an endoscope with a hood according to a third embodiment of the present invention.

FIG. 6 is a front view of a distal end surface of a distal end body of a distal end portion of a hooded endoscope according to a third embodiment of the present invention.

FIG. 7 is an external view showing an entire configuration of an endoscope with a hood according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insertion part 2 Main part of a front-end | tip 3 Tip hood 3a The part closest to the treatment tool outlet 11 Observation window 12 Treatment tool outlet 18 Treatment instrument insertion channel 100 Forceps 101 Forceps piece

Claims (3)

[Claims] 1. A distal end portion of a hood-equipped endoscope having a distal end hood mounted so as to protrude forward from an outer peripheral portion of a distal end main body having an observation window and a treatment tool outlet on the distal end surface. 3. The distal end portion of a hooded endoscope according to claim 1, wherein only a portion of the distal end hood closest to the treatment tool outlet is bulged outward. 2. A distal end portion of a hood-equipped endoscope having a distal end hood mounted so as to protrude forward from an outer peripheral portion of a distal end portion main body having an observation window and a treatment tool outlet on the distal end surface. In the end portion of the endoscope with a hood, only the inner wall surface of a portion of the distal end hood closest to the treatment tool outlet is widened outward, and the thickness of the distal end hood is reduced only at that portion. . 3. A distal end portion of a hood-equipped endoscope having a distal end hood mounted so as to protrude forward from an outer peripheral portion of a distal end body having an observation window and a treatment tool outlet on the distal end surface. The hood, wherein a portion of the distal end hood closest to the treatment tool outlet is formed of an elastic member, and the other portion is formed of a member harder than the elastic member. The end of the endoscope.