JPS6015526Y2 - Endoscope hood - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a hood attached to the tip of an endoscope.

A cover glass for an illumination optical system, an observation optical system, or the like is watertightly attached to the end surface of the distal end portion of the endoscope using an adhesive or the like.

In some cases, this cover glass also serves as a lens for an optical system.

However, endoscopes are often used under harsh temperature and pressure conditions, such as high-pressure sterilization of water and fish, and temperature rises due to strong light from light source devices, so if used for a long period of time, the If the adhesive that attaches the glass deteriorates, the attachment may become loose, and in some cases, the cover glass may fall off during use.

If the cover glass falls off in this way, not only will the optical system become unusable, but if the cover glass falls off inside the cavity, it will be difficult and dangerous to recover.

This invention was made based on the above circumstances, and its purpose is to provide an endoscope hood that can reliably prevent the cover glass from falling off and allow the endoscope to be used safely.

An embodiment of this invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a distal end component made of metal, synthetic resin, or the like, and this distal end component 1 is located at the distal end of the insertion section of the endoscope.

The tip component 1 is equipped with an objective lens group 2 that serves as the base for the observation optical system. 4 is fixed watertightly with adhesive or the like.

Further, a light guide 5 constituting an illumination optical system is inserted alongside these observation optical systems.

This light guide 5 is made of optical fiber or the like, and a cover glass 6 that also serves as a lens, a so-called -cover lens, is provided at the end of the light guide 5.

Similar to the cover glass 4 of the observation optical system described above, this cover glass 6 is watertightly attached to a cover glass attachment hole 7 provided in the end surface of the tip component 1 using an adhesive or the like.

Reference numerals 8 and 9 designate channel openings used for insertion of treatment tools or as suction passages.

A hood 10 is attached to the distal end component 1 in order to protect the body cavity wall or the distal end component itself.

This hood 10 includes a cylindrical hood body lea made of a relatively soft material such as synthetic resin, and a cylindrical hood body lea made of a relatively soft material such as synthetic resin.
It is integrally formed with a locking part 11.11 for fixing the tip part 1 to the tip part 1, and a cover part 12 that covers the end surface of the tip part 1.

In this cover part 12, an opening window 13.13 having an inner diameter slightly smaller than the outer diameter of each cover glass 4, 6 is formed at a position facing the cover glasses 4, 6. Another opening window 14,14 is formed which has an inner diameter slightly larger than the inner diameter of the channel openings 8,9.

Further, the locking portions 11, 11 prevent the hood 10 from being pulled out from the tip component 1, and also engage the locking recess 15, which is an example of a locked portion, to prevent the hood 10 from being removed from the tip component 1. The position of the hood 10 in the circumferential direction relative to the hood 1 is regulated to fix the hood 10 at a predetermined position.

Therefore, the opening windows 13° 13, 14, 14 are correctly fixed in positions corresponding to the respective cover glasses 4° 6 and channel openings 8, 9, respectively.

According to this embodiment, since the opening window 13.13 is provided with a diameter smaller than that of the cover glass 4.6, even if the attachment of the cover glasses 4, 6 becomes loose while the endoscope is in use, the opening window 13.13 can be easily fixed. As shown in the figure, the edges of the cover glasses 4 and 6 form an opening window 13.
By being caught on the cover glasses 13, the cover glasses 4 and 6 can be prevented from falling off, resulting in safety.

Note that it is desirable to form the aperture window as large in diameter as possible so as not to block the light rays of each optical system, but if the cover part 12 is made of a transparent material, the light of the optical system will not be blocked. It is possible to prevent the characteristics of the optical system from deteriorating.

This idea is as explained above, and an opening window smaller in diameter than the cover glass is formed in a part of the cover provided on the hood body, and an opening window smaller in diameter than the cover glass is formed on the inner periphery of the hood body. The locking part that engages with the locking part to fix the hood body in the circumferential and axial directions is provided, so it can withstand harsh temperatures and
Even if the attachment of the cover glass becomes loose due to use under pressure conditions, the cover glass can be prevented from falling off during use, which is highly effective in safely performing endoscopy.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, with Fig. 1 being a front view of the tip of the endoscope with the hood attached, Fig. 2 being a longitudinal side view of the tip, and Fig. 3 showing the operation of the opening window. FIG. 3 is a cross-sectional view of the cover glass attachment portion. 1...Tip component, 4, 6...Cover glass, 10...Hood, 10a...
Hood body, 11... Locking part, 12...
・Part of the cover, 13...Opening window, 15...
- Locking recess (locked part).

Claims (2)

[Scope of utility model registration request] (1) On the hood body attached to the tip component of the endoscope,
A part of the cover is provided on the inner periphery of the hood body to cover the end surface of the tip component, and engages with a locked part formed on the outer periphery of the tip component to move the hood body in the circumferential and axial directions. A locking portion for fixing is provided, and an opening window having a smaller diameter than the outer diameter of the cover glass is formed in a part of the cover at a position facing the cover glass of the optical system disposed on the end surface of the tip component. Features of the endoscope hood. (2) The endoscope hood according to claim 1, wherein a portion of the cover is made of a transparent material.