Laser endoscope

• US 4,589,404 A
• Filed: 01/03/1984
• Issued: 05/20/1986
• Est. Priority Date: 01/03/1984
• Status: Expired due to Term

• Current Assignee: Medical Dynamics, Inc. (Eastman Kodak Company)
• Original Assignee: Medical Dynamics, Inc. (Eastman Kodak Company)
• Inventors: Case, Steven K., Barath, James D.
• Primary Examiner(s): Davis, Curtis R.
• Application Number:
  US06/567,800
• Time in Patent Office: 868 Days
• Field of Search: 128/6, 128/7, 128/8
• US Class Current: 600/108
• CPC Class Codes: A61B 1/00117 Optical cables in or with an endoscope
• CPC Class Codes: A61B 1/00126 optical, e.g. for light supply cables
• CPC Class Codes: A61B 1/00128 mechanical, e.g. for tubes or pipes
• CPC Class Codes: A61B 1/042 characterised by a proximal camera, e.g. a CCD camera
• CPC Class Codes: A61B 1/317 for bones or joints, e.g. osteoscopes, arthroscopes
• CPC Class Codes: A61B 18/20 using laser
• CPC Class Codes: A61B 18/24 with a catheter A61B18/26, A61B18/28 take precedence
• CPC Class Codes: A61B 2018/00636 Sensing and controlling the application of energy
• CPC Class Codes: A61B 2018/2216 Braided or helically wound
• CPC Class Codes: A61B 2018/2244 Features of optical fibre cables, e.g. claddings
• CPC Class Codes: G02B 23/2469 using optical fibres

Abstract

A laser endoscope includes a micro-thin optic cable assembly which may be inserted into a body cavity by micro-surgical or non-surgical procedures. A coherent jacketed fiber optical bundle is provided in the center of the assembly having a diameter of no more than 3.5 mm. with an optical lens system at the distal end for reflecting an image of a portion of the interior of the cavity. A pair of single optical fibers are spirally wound around the cable, each of which has a total diameter including a jacket of approximately 140 microns. One of these fibers carries a laser light beam to the cavity and the other is for redundancy.

The proximate end of the optical cable assembly connects to a remote unit wherein a laser diode light source is provided to direct a beam of light into the end of one of the single optical fibers. A TV camera is also provided in the remote unit together with suitable optics for transmitting the image from the optical cable to a viewing screen on the remote unit.

Claims

1. Apparatus for viewing and/or treatment within body cavities by non-surgical or micro-surgical procedures, said apparatus comprising;

a coherent fiber optical cable whose diameter is micro-thin having a planar distal end for insertion into a body cavity and a planar proximate end;

a single optical fiber, having a distal end adjacent said distal end of said optical cable and a proximate end adjacent said proximate end of said optical cable;

a laser light source alignable with said proximate end of said single fiber to transmit light to said distal end to illuminate the body cavity;

optical lens means at the distal end of said optical cable to focus an image of a portion of the cavity on said distal end of said optical cable for transmission through said optical cable;

optical focus means connectable to said proximate end of said optical cable to focus an image of the portion of the body cavity reflected through said optical cable; and

viewing means connected to said focus means for displaying an image of the portion of the body cavity.

2. Apparatus, as claimed in claim 1, further including:

interface means aligning said proximate end of said single fiber with said laser light source and aligning said proximate end of said optical cable with said optical focus means.

3. Apparatus, as claimed in claim 1, wherein:

said single fiber is spirally wound around the outside of said optical cable.

4. Apparatus, as claimed in claim 1 wherein:

said single fiber extends through the center of said optical cable.

5. Apparatus as claimed in claim 1, wherein:

said laser light source is a laser diode.

6. Apparatus, as claimed in claim 5, wherein:

said laser diode emits light in the infrared and near infrared range.

7. Apparatus, as claimed in claim 6, wherein;

said laser diode emits light having a wavelength between 790 and 860 nm.

8. A laser endoscope for viewing and/or treatment within body cavities by non-surgical or micro-surgical procedures, said endoscope comprising:

a remote viewing unit which includes;

a TV camera;

a viewing monitor for displaying an image of the image viewed by said TV camera;

an optical cable interface including optical focus means for focusing an image from an optical cable on said TV camera;

a laser diode for providing a beam of light to an optical fiber; and

a laser fiber interface for aligning a light beam from said laser diode with the optical fiber;

an endoscopic cable assembly including;

a coherent multi-fiber optical cable of micro-thin diameter having a planar distal end for insertion into a body cavity and a planar proximate end;

optical lens means at the distal end of said optical cable to focus an image of a portion of the cavity on said distal end of said optical cable for transmission of the image therethrough;

a single optical fiber having a distal end adjacent said distal-end of said optical cable and a proximate end adjacent said proximate end of said optical cable; and

an interface connector for removable connection to said remote viewing unit for aligning said optical cable with said optical cable interface and for aligning said single optical fiber with said laser fiber interface.

9. A laser endoscope, as claimed in claim 8, wherein said optical focus means includes:

a stationary optical system within said remote unit with which said optical cable is alignable; and

means to movably adjust said camera with respect to said stationary optical system to focus an image from said optical cable.

10. A laser endoscope, as claimed in claim 8, further including:

a redundant optical fiber having a distal end adjacent said distal end of said optical cable and a proximate end adjacent said proximate end of said optical cable;

a pair of spaced optic fiber pins in said interface connector aligned respectively with the ends of said single optic fiber and said redundant fiber;

socket means in said laser fiber interface for selectively receiving one of said optic fiber pins in one end thereof and aligning one of them with the beam of light from said laser diode; and

means for selectively shifting said socket means for alignment with the desired one of said pins prior to insertion of said interface connector.

11. A laser endoscope, as claimed in claim 10, further including:

an illuminator bundle connected to the other end of said socket means for directing the beam of light from said laser diode into said proximate end of said single optic fiber or said redundant fiber.

12. A laser endoscope, as claimed in claim 10, wherein said shifting means includes:

a slide member supporting said socket means and mounted for sliding movement on said remote unit, which is movable respectively from the first position to locate said socket means to receive said optic fiber pin to align said single optic fiber with the beam of light from said laser diode to a second position to locate said socket means to receive said redundant fiber pin to align said redundant optic fiber with the beam of light from said laser diode; and

lever means connected to said slide member for selectively moving it form said first position to said second position.