# US 9,433,759 B2 · Insertion assisting tool for endoscope

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- Number: US 9,433,759 B2
- Document ID: US9433759B2
- Status: Granted
- Kind: B2
- Application number: 13/476,174
- Filed: 2012-05-21
- Published: 2012-09-13
- Granted: 2016-09-06
- Earliest claimed: 2003-12-05
- Assignees: FUJIFILM Corporation
- Applicants: Tetsuya Fujikura; Hirotaka Kawano
- Inventors: Tetsuya Fujikura; Hirotaka Kawano
- Web page: https://patentgrep.com/patent/US9433759B2

## CPC

- A61M 25/0662: {Guide tubes}
- A61B 17/3415: {for introducing tubes or catheters, e.g. gastrostomy tubes, drain catheters (A61B17/3417 takes precedence; body piercing catheter guide needles A61M25/06)}
- A61B 17/3417: {Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating (syringe needles A61M5/32; dilators A61M29/00)}
- A61B 17/3431: {being collapsible, e.g. made of thin flexible material (A61B17/3423 takes precedence)}
- A61M 25/10: Balloon catheters ({A61M25/0125 takes precedence; embolectomy A61B17/22032; retractors A61B17/02;} inflatable balloons for placing stents or stent-grafts A61F2/958 {; stomach balloons for treatment of obesity A61F5/0003; oesophagal tubes A61J15/00})
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

An insertion assisting tool for an endoscope into which an insertion section of the endoscope is inserted from a base end portion side. The insertion assisting tool may include a fluid sealing device which seals a space between a base end part of the insertion assisting tool and the endoscope insertion section, the space being formed while the insertion section of the endoscope is inserted into the base end portion side.

## Claims

### Claim 1

An insertion assisting tool for an endoscope into which an insertion section of the endoscope is inserted, comprising:
a substantially cylindrical tube formed of an elastic body in which a smaller opening than a diameter of a base end part of the insertion assisting tool is formed at one end and a smaller opening than a diameter of the endoscope insertion section is formed at the other end,
wherein in the tube, the opening formed at the one end is attached to the base end part of the insertion assisting tool in close contact with the base end part, the tube covers from outside of the insertion assisting tool an end portion of the base end part of the insertion assisting tool, and the insertion section is slidably inserted through the tube with the insertion section of the endoscope closely fitted in the opening formed at the other end, and
wherein the tube is formed in a size which satisfies a formula of d>a−c+(b−a)/2 where an inner diameter of the insertion assisting tool is a, a maximum diameter of the tube when the tube is attached to the insertion assisting tool is b, a diameter of an opening formed at the other end of the tube is c, and a distance from a fixing portion of the tube to the insertion assisting tool to an edge portion of the opening formed at the other end of the tube is d.

### Claim 2 (depends on 1)

The insertion assisting tool for an endoscope according to claim 1, further comprising: an inflatable and deflatable balloon attached to at least one of the insertion section of the endoscope and a tip end part of the insertion assisting tool.

### Claim 3 (depends on 1)

The insertion assisting tool for an endoscope according to claim 1, wherein a diameter of the opening formed at the other end of the tube is set at 70% to 90% of outer diameter of the insertion section.

### Claim 4 (depends on 1)

The insertion assisting tool for an endoscope according to claim 1, wherein a space between inner peripheral surface of the base end part of the insertion assisting tool and outer peripheral surface of the insertion section is set to be larger than spaces between inner peripheral surface of parts other than the base end part of the insertion assisting tool and outer peripheral surface of the insertion section.

### Claim 5 (depends on 1)

The insertion assisting tool for an endoscope according to claim 1, wherein in a first state, the smaller opening at the base end part has the diameter smaller than the diameter of the base end part and in a second state, has a diameter larger than the diameter of the base end part such that the tube covers an end portion of the base end part of the insertion assisting tool.