Endoscopic treatment instrument and retaining device

An endoscopic treatment instrument comprising:

• a casing holding portion that is provided at a distal end of an insertion portion to be inserted into a body and that holds a casing connected to a tip member by a thread, the casing containing the tip member detachably attached to one of a pair of forceps members after being passed through a tissue in response to a closing motion of the pair of forceps members at least one of which is pivoted openably and closably with respect to the other forceps member;
• a casing locking member which engages the casing holding portion and the casing together;
• and
• a guide member that is provided at the tip cover and that controls an engagement state made by the casing locking member between the casing holding portion and the casing.

An endoscopic treatment instrument comprising:

• a pair of forceps members;
• a tip cover which supports a pivot shaft that pivots at least one of the pair of forceps members openably and closably with respect to the other forceps member;
• a receiving portion that detachably holds a side of a distal end of an endoscope to be inserted into a body;
• and
• a regulating member that regulates a position of the distal end of the endoscope at a relative position with respect to the tip cover in order to restrict an amount of projection of the distal end of the endoscope with respect to the receiving portion.

An endoscopic treatment instrument comprising:

• a first sheath and a second sheath to a distal end of each of which a treatment portion used to perform treatment is connected and to a proximal end of each of which a control portion that operates the treatment portion is connected;
• a first holder which bundles the first sheath and the second sheath together;
• a second holder which bundles the first sheath and the second sheath are and that is provided nearer to the distal end than the first holder;
• a first adjusting member that provides sliding friction to the second sheath with respect to the first holder;
• and
• a second adjusting member that provides greater sliding friction than the first adjusting member to the first sheath with respect to the second holder.

A retaining device comprising:

• a string member that has an end and an opposite end;
• a tip member that is connected to the end of the string member;
• a thread locking member provided at the string member;
• a casing that has a space where the tip member and the thread locking member are contained and in which a tip-member locking member that is engaged with the tip member is provided;
• and
• a hole that is formed in the casing and into which a device that releases locking of the tip member by the tip-member locking member can be inserted.