BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a cleaning tool for insertion instrument used for cleaning a distal end component portion provided at a distal end portion of an insertion portion of an insertion instrument.

2. Description of the Related Art

An example of an insertion instrument includes a medical endoscope. The endoscope includes an insertion portion, and a distal end component portion is provided on a distal end side of the insertion portion. The endoscope includes a front-view type endoscope in which an illumination lens and an objective lens are arranged on a distal end surface substantially orthogonal to an insertion-portion longitudinal axis of the distal end component portion or a side-view type endoscope in which an illumination lens and an objective lens are arranged on a side surface substantially parallel to the insertion-portion longitudinal axis of the distal end component portion.

The side-view type endoscope is a so-called duodenoscope and the like, and a turnable raising apparatus is provided at the distal end component portion. The distal end component portion including the raising apparatus is covered by a distal end cover having electrical insulation properties. The distal end cover is fixed to the distal end component portion by an adhesive or the like to prevent the distal end cover from falling off the distal end component portion.

The raising apparatus is typically configured mainly by a raising base turnably arranged on the distal end component portion, a raising base operation lever provided on an operation portion, and a raising base operation wire that moves with an operation of the raising base operation lever and swings the raising base.

A treatment instrument channel, into which a treatment instrument is inserted, is provided in the insertion portion of the side-view type endoscope. After being inserted into the treatment instrument channel, the treatment instrument is guided to the vicinity of a target site by passing onto the raising base from a distal end opening provided in the distal end component portion. A position of the distal position of the guided treatment instrument can be changed when the raising base is caused to swing by the operation of the raising base operation lever from a user.

Examples of the treatment instrument inserted into the treatment instrument channel include a contrast tube, a basket catheter, a balloon catheter, and an electric scalpel.

The endoscope is cleaned and disinfected after being used.

Japanese Patent Application Laid-Open Publication No. 2015-181914 discloses an endoscope cleaning attachment in which cleaning and disinfection work can be quickly performed by reliably supplying a cleaning liquid or the like to a target site in an accommodation chamber of a distal end component portion for endoscope where a treatment instrument raising base is turnably disposed.

Japanese Patent No. 4855824 discloses a distal end cover for endoscope capable of being removed from a distal end component portion by tearing and breaking the distal end cover for endoscope without damaging a soft member that configures an insertion portion, and capable of being prevented from falling off at the time of use.

When the insertion portion of the side-view type endoscope is cleaned, the cleaning can be easily performed by removing the distal end cover and exposing the distal end component portion.

SUMMARY OF THE INVENTION

According to an aspect of the present invention, a cleaning tool for insertion instrument includes: a cleaning cap configured to be attachable to and detachable from a distal end component portion provided on a distal end side of an insertion portion in an insertion instrument and covered by a tubular cover when the insertion instrument is used, attachment and detachment of the cleaning cap to and from the distal end component portion being performed in a state where the cover is removed from the distal end component portion; and a cap-side engaging portion provided on the cleaning cap and configured to be engaged with a distal end component portion-side engaging portion provided on an outer peripheral surface, at least a part of which is covered by the cover, of the distal end component portion.

