JPS649854B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an endoscope capable of suctioning and recovering foreign matter such as polyps using a suction port.

[Background technology and its problems] Currently, when a foreign body such as a polyp inside a body cavity is expelled from the body as an example of a treatment using an endoscope, the foreign body such as a polyp is inserted into the suction port at the tip of the endoscope. A method is known in which the endoscope is sucked and pulled out of the body together with the endoscope (Japanese Utility Model Publication No. 143804/1983). However, in this method, if the foreign object such as a polyp is relatively large, the observation window on the distal end of the endoscope is covered with the foreign object, making it impossible to observe the inside of the body cavity. For this reason, the tip is removed blindly without being able to confirm the current position of the tip. Therefore, since the body cavity is extracted without knowing the situation inside the body cavity, it is not possible to take appropriate measures (for example, angle manipulation) and foreign objects such as polyps are likely to fall off during the extraction. Furthermore, safety is likely to be compromised due to blind removal.

Therefore, a structure as shown in FIG. 1 was considered. This is because the field-of-field center optical axis l direction of the objective observation optical system b whose optical axis l is along the longitudinal axis L direction of the insertion portion a intersects with the normal direction of the tip opening surface S of the suction port c, and the tip opening surface S of the suction port c is at an angle θ of less than 180° with the front surface e of the objective window of the objective observation optical system b.
This endoscope is configured so that the two sides intersect at each other and face outward.

However, with this method, when a polyp f is adsorbed to the tip opening surface S of the suction port c,
As shown in Figure 1, the polyp f protrudes beyond the outer circumferential surface of the insertion part a, so when the insertion part a is removed with the polyp f still attached, the polyp f gets caught on the body cavity wall. , there is a risk of it falling. In other words, with this type of polyp, the amount of polyp f that protrudes outside the position of the outer circumferential surface of the insertion section a becomes large, and there is a problem that there are many chances of the polyp falling off when the insertion section a is removed.

[Object of the invention] The present invention has been made focusing on the above circumstances, and
The purpose is to provide an endoscope that does not obstruct the observation field of view by the polyps that are being collected by adsorption, and that can prevent the adsorbed polyps from falling off when the insertion section is removed. It is in.

[Summary of the Invention] The present invention provides an endoscope having a suction port and an objective observation optical system in the insertion portion, wherein the normal direction of the distal opening surface of the suction port is the same as the longitudinal axis direction of the insertion portion; The normal direction of the tip opening surface of the suction port intersects with the field-of-view center axis direction of the objective observation optical system,
The endoscope is configured such that the front surface of the objective window of the objective observation optical system and the opening surface of the distal end of the suction port intersect at an angle of less than 180°.

[Embodiment of the Invention] FIG. 2 shows an embodiment of the invention.
Reference numeral 1 in FIG. 2 is the distal end of the insertion section 2 of the endoscope. The distal end surface of the distal end portion 1 is formed with a first surface portion 3 that is perpendicular to the longitudinal axis direction L of the insertion portion 2, and a second surface portion 4 that is continuous with the first surface portion 3 and faces diagonally forward. There is. A suction pipe 11 is provided on the first surface portion 3.
A suction port 12 communicating with is provided, and this tip opening surface S is flush with the first surface portion 3 thereof. Further, the second surface portion 4 is provided with an objective window 5, and the outer surface of the objective window 5 is flush with the second surface portion 4. An objective lens 6 is installed inside the objective window 5 via a prism 16, and an objective observation optical system 9 forms an image of the field of view seen through the objective window 5 onto the incident end surface 8 of the optical fiber bundle 7 for image guide. is provided. The central optical axis l of the field of view of the objective observation optical system 9 does not coincide with the longitudinal direction L of the insertion section 2, but faces diagonally forward of the insertion section 2. That is, the objective observation optical system 9 performs oblique observation. Also,
The normal line of the distal opening surface S of the suction port 12 is the insertion part 2
It coincides with the longitudinal axis direction L of.

On the other hand, a suction conduit 11 that also serves as a forceps insertion conduit opens in the first surface portion 3 to form a suction port 12 . The suction conduit 11 is formed parallel to the longitudinal axis direction L of the insertion portion 2, and penetrates through the first surface portion 3 as it is to form the suction port 12. Therefore, the tip opening surface S of the suction port 12 coincides with the first surface portion 3 described above. That is, the normal n to the opening surface S of the distal end of the suction port 12 is along the longitudinal axis direction L of the insertion section 2 .

Furthermore, the normal n to the center of the distal opening surface S is arranged to intersect at a point on an extension of the visual field central axis l. In addition, the front surface of the objective window 5 (second
corresponds to surface portion 4 of . ) and the tip opening surface S of the suction port 12 (which coincides with the first surface portion 3) form an angle of θ=135°. That is, the angle θ is less than 180°.

Further, a forceps raising stand 14 is provided at the inward portion of the suction port 12, and is used when the suction line 11 is used as a forceps insertion line. It is operated from the hand-side operation section. Further, 16 in FIG. 2 is a prism of the objective observation optical system 9, and in this case, the optical axis of the objective observation optical system 9 is bent in the middle.

According to this configuration, the foreign matter 13 such as a polyp adsorbed to the suction port 12 is removed by the objective observation optical system 9.
The object will not move away from the objective window 5 and block its field of view. Therefore, even during retrieval, the situation inside the body cavity can be observed through the objective observation optical system 9, and foreign objects 13 such as polyps can be prevented from falling out by appropriately bending the insertion section 2 according to the situation. The insertion section 2 of the endoscope can be safely removed.

Furthermore, since the second surface section 4 is formed to face obliquely outward relative to the first surface section 3, the distal end section 1 can be easily inserted into the body cavity, and pain to the patient can be alleviated.

Furthermore, as shown in FIG. 2, the opening surface S at the tip of the suction port 12 that adsorbs foreign objects 13 such as polyps is formed on the first surface 3 perpendicular to the longitudinal axis direction L of the insertion section 2. The foreign matter 13 adsorbed to the insertion portion 2 enters into the diameter of the insertion portion 2. In other words, as in the case shown in FIG. 2, the amount of foreign matter 13 pulled out laterally from the position of the side outer peripheral surface of insertion portion 2 can be reduced or eliminated. Therefore, it is possible to prevent as much as possible the situation in which the adsorbed foreign matter 13 comes into contact with the body cavity wall and falls when the insertion section 2 is pulled out.
Therefore, the endoscope can be safely removed while preventing foreign objects 13 such as polyps from falling off.

In each of the above embodiments, the normal line n of the central axis l of the field of view of the objective observation optical system 9 and the aperture surface S at the tip end of the suction port 12
In this case, the two intersect at one point, but the present invention is not limited to this. In other words, this includes the case where the central axis l of the visual field and the normal line n are different from each other. In other words,
Each direction (parallel direction) between the visual field center axis l and the normal line n
It is sufficient if they intersect.

Alternatively, an objective window of an objective observation optical system may be provided on the side circumferential surface of the distal end of the insertion section near the front distal surface (so-called side viewing type), and a suction port may be provided on the front distal surface of the distal end.

[Effects of the Invention] As described above, according to the present invention, foreign objects such as polyps that are attracted to the suction port and are to be collected do not obstruct the observation field of view. Therefore,
Even during retrieval, the situation inside the body cavity can be observed, and appropriate operations such as bending operations can be performed according to the situation. Moreover, since the amount by which foreign objects such as polyps adsorbed to the suction port protrude laterally from the outer circumferential surface of the insertion section can be reduced, it is possible to prevent the foreign objects from touching the body cavity wall and falling off when the insertion section is withdrawn. Therefore, the endoscope can be safely removed while preventing foreign objects such as polyps from falling off.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration near the distal end of an insertion section showing a prior example of the present invention, and FIG. 2 is an explanatory diagram of the configuration near the distal end of the insertion section showing an embodiment of the present invention. 2... Insertion part, 3... First surface part, 4... Second
surface portion, 5...objective window, 9...objective observation optical system,
12...Suction port, 13...Foreign object, l...Center axis of visual field, n...Normal line, S...Tip opening surface.

Claims (1)

[Claims] 1. In an endoscope having a suction port and an objective observation optical system in the insertion section, the normal direction of the distal opening surface of the suction port is the same as the longitudinal axis direction of the insertion section, and the distal opening surface of the suction port The normal direction of the objective observation optical system intersects with the central axis of the field of view of the objective observation optical system, and the front surface of the objective window of the objective observation optical system and the tip aperture of the suction port intersect at an angle of less than 180°. An endoscope featuring: