Medical instrument for endoscope and treatment method

• US 9,827,038 B2
• Filed: 09/12/2013
• Issued: 11/28/2017
• Est. Priority Date: 06/11/2007
• Status: Active Grant

• Current Assignee: Olympus Corporation
• Original Assignee: Olympus Corporation
• Inventors: Yanuma, Yutaka
• Primary Examiner(s): Gray, Phillip
• Application Number:
  US14/025,131
• Publication Number:
  US 20140018800A1
• Time in Patent Office: 1,538 Days
• Field of Search: 604 96, 604604, 604 22, 604100-103, 606 39
• CPC Class Codes: A61B 17/22 Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for dilators A61M29/00
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 18/1485 having a short rigid shaft for accessing the inner body through natural openings
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2017/22067 Blocking; Occlusion A61B2017/22054 takes precedence
• CPC Class Codes: A61B 2018/00535 Biliary tract
• CPC Class Codes: A61B 2018/144 Wire

Abstract

A medical instrument for an endoscope according to the invention is the medical instrument to be used in the endoscope by being inserted therein, and the medical instrument includes: a flexible elongated sheath having a first lumen and a second lumen; a conductive wire which is inserted into the first lumen and of which a portion of a distal side is exposed to the outside of the sheath as an instrument unit; and a balloon which is attached to the sheath and is expandable with the supply of fluid from the second lumen. The balloon is configured such that an axial dimension thereof is larger than a radial dimension upon expansion and a distal end of the balloon upon expansion is located closer to a proximal side than the treatment unit exposed from the sheath.

Claims

1. A medical instrument for an endoscope to be used in the endoscope by being inserted therein, comprising:

a first flexible elongate sheath having a first lumen;

a conductive wire which is inserted into the first lumen and of which a portion of a distal side is exposed to the outside of the sheath as an instrument unit;

a second sheath into which the first sheath is inserted so as to advance and retreat in an axial direction; and

a balloon which is attached to an outer circumference of a distal side of the second sheath and is expandable with the supply of fluid, and an outer diameter of the balloon is equal to or less than an outer diameter of a portion of the second sheath that is proximal to the balloon in an initial state of the balloon,

wherein the balloon is configured such that an axial dimension thereof is larger than a radial dimension upon expansion,

the second sheath is movable relative to the first sheath in a range from a position where a distal end of the balloon is superposed on the treatment unit to a position where the distal end of the balloon is located more proximal than a proximal end of the treatment unit by a predetermined distance,

the first sheath has a distal portion at which the treatment unit is exposed, a proximal portion which is extended more proximal than the proximal end of the treatment unit, and a step which is formed between an outer circumference surface of the distal portion of the first sheath and an outer circumference surface of the proximal portion of the first sheath,

the second sheath has a small-diameter portion which is formed with an inner diameter smaller than an outer diameter of the proximal portion of the first sheath, the balloon being attached to the outer circumference surface of the small-diameter portion of the second sheath, and a large-diameter portion which is formed with an inner diameter larger than an outer diameter of the proximal portion of the first sheath and is extended more proximal than a proximal end of the balloon, and

the second sheath is capable of being retracted until a proximal end of the small-diameter portion of the second sheath abuts to the step of the first sheath.

2. A medical instrument for an endoscope to be used in the endoscope by being inserted therein, comprising:

a first flexible elongate sheath having a first lumen and a second lumen;

a conductive wire which is inserted into the first lumen and of which a portion of a distal side is exposed to the outside of the first sheath as an instrument unit;

a balloon which is attached to the sheath located closer to a proximal side than the treatment unit and is expandable with the supply of fluid from the second lumen, and an outer diameter of the balloon is equal to or less than an outer diameter of a portion of the first sheath that is proximal to the balloon in an initial state of the balloon; and

a second sheath into which the first sheath is inserted so as to move relatively in an axial direction,

wherein the balloon is configured such that an axial dimension thereof is larger than a radial dimension upon expansion,

the second sheath covers a proximal side of the balloon so that the axial dimension of the balloon varies upon expansion, and

a distal end of the balloon is positioned between a proximal end of the treatment unit and a proximal end of the balloon.

3. A medical instrument for an endoscope to be used in the endoscope by being inserted therein, comprising:

a first flexible elongate sheath having a first lumen;

a conductive wire which is inserted into the first lumen and of which a portion of a distal side is exposed to the outside of the first sheath as an instrument unit;

a second sheath into which the first sheath is inserted in an axial direction; and

a balloon of which a distal end is fixed in an airtight manner to an outer surface of the first sheath located closer to a proximal side than the treatment unit and a proximal end is fixed to an outer surface of the second sheath in an airtight manner, and an outer diameter of the balloon is equal to or less than an outer diameter of a portion of the second sheath that is proximal to the balloon in an initial state of the balloon,

wherein the balloon is expanded by supplying fluid in a space between the outer surface of the first sheath and an inner surface of the second sheath, and

the distal end of the balloon is positioned between a proximal end of the treatment unit and the proximal end of the balloon.