Endoscope

• US 5,257,618 A
• Filed: 11/06/1991
• Issued: 11/02/1993
• Est. Priority Date: 11/06/1990
• Status: Expired due to Term

• Current Assignee: Fujinon Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Optical Co. Ltd (Fujifilm Holdings Corporation)
• Inventors: Kondo, Mituo
• Primary Examiner(s): RICHARD, KAREN
• Assistant Examiner(s): Jalbert, Karen A.
• Application Number:
  US07/788,417
• Time in Patent Office: 727 Days
• Field of Search: 138/120, 138/118, 128/4, 604/95, 604/280
• US Class Current: 600/150
• CPC Class Codes: G02B 23/26 using light guides for illumination G02B23/2469

Abstract

An endoscope has a flexible insert portion that is inserted into an object to be inspected. A light guide, an image guide or signal cable, an instrument channel and other lengthwise members are provided therein. At least one elastic restoring body is provided in the insert portion in order to restore the lengthwise members to their original positions when straightened back after bending or curving of the insert portion.

Claims

1. An endoscope which comprises:

a flexible insert portion adapted to be inserted into an object to be inspected;

a plurality of lengthwise members including at least an optical fiber bundle for transmitting illuminating light to said object and a channel member which are provided within said flexible insert portion in a freely movable manner and;

at least one elastic restoring body which is elastically compressible in a cross-sectional direction of said flexible insert portion in a flexible section of said flexible insert portion so as to partition said lengthwise members off from each other;

wherein said elastic restoring body allows for movement of said lengthwise members in a cross-sectional plane of said flexible insert portion in arbitrary directions while keeping said lengthwise members partitioned off from each other when said flexible insert portion is bent, and restoring said lengthwise members to their predetermined original positions when said insert portion is straightened.

2. The endoscope according to claim 1, wherein said restoring body is provided at three separate locations in the insert section, respectively, at a first location near a bending section, at a second junction position of said insert section with respect to a control unit, and a third, midway position of said first and second positions.

3. The endoscope according to claim 1, wherein said restoring member comprises foamed rubber.

4. The endoscope according to claim 3, wherein said restoring body is made of two-liquid foamed rubber materials that are allowed to foam by mixing two liquids so as to react with each other.

5. The endoscope according to claim 1, wherein said restoring body comprises a piece of sponge shaped to partition the cross-sectional space in said insert section into a desired number of sections.