Medical instrument

A medical instrument comprising:

• a first elongated member including:
• a fluid lumen through which a fluid is flowable,
• a fluid supply section through which fluid is suppliable to the fluid lumen, and
• an aperture opening located in a distal end surface of the first elongated member, the aperture being configured to allow fluid to exit the fluid lumen via the aperture;
• a second elongated member including:
• an insertion lumen in which the first elongated member is insertable, and
• a discharge section through which the fluid can be discharged;
• and
• a movement section comprising a seal member configured to form a seal between the first elongated member and the second elongated member in a state where the first elongated member is disposed in the insertion lumen of the second elongated member, the movement section being configured to allow the first elongated member and the second elongated member to move relative to each other such that the discharge section of the second elongated member is positionable on a distal side of the aperture of the first elongated member,
• wherein the first elongated member is more rigid than the second elongated member,
• wherein the first elongated member has a first tapered section in which a diameter of the fluid lumen gradually increases from a distal side toward a proximal side,
• wherein the second elongated member has a second tapered section in which a diameter of the insertion lumen gradually increases from the distal side toward the proximal side, and
• wherein the first tapered section and the second tapered section are configured to be disposed in an axially positionally matched state in a condition in which the first elongated member is disposed in the insertion lumen.

A medical instrument comprising:

• a main body section;
• a first elongated member including:
• a fluid lumen through which a fluid is flowable,
• a fluid supply section through which fluid is suppliable to the fluid lumen, and
• an aperture opening located in a distal end surface of the first elongated member, the aperture being configured to allow fluid to exit the fluid lumen via the aperture;
• a second elongated member disposed in the main body section such that the second elongated member is slidable relative to the main body section, the second elongated member including:
• an insertion lumen in which the first elongated member is insertable, and
• a discharge section through which the fluid can be discharged;
• and
• a movement section comprising a seal member configured to form a seal between the first elongated member and the second elongated member in a state where the first elongated member is disposed in the insertion lumen of the second elongated member, the movement section being configured to allow the first elongated member and the second elongated member to move relative to each other such that the discharge section of the second elongated member is positionable on a distal side of the aperture of the first elongated member;
• a connection section attached to the main body section, the connection section being configured to connect to an imaging device;
• and
• an inflation section fixed to an outer periphery of the first elongated member,
• wherein the first elongated member is more rigid than the second elongated member.