Medical optical apparatus

• US 5,865,829 A
• Filed: 11/17/1995
• Issued: 02/02/1999
• Est. Priority Date: 06/15/1992
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Topcon
• Original Assignee: Kabushiki Kaisha Topcon
• Inventors: Kitajima, Nobuaki
• Primary Examiner(s): Shay, David M.
• Application Number:
  US08/559,802
• Time in Patent Office: 1,173 Days
• Field of Search: 128/633, 128/634, 128/664-666, 128/654, 128/657, 606/2-4, 606/6, 606/7, 606/9-18, 607/88-93, 359/368-377, 359/351, 600/473-476
• US Class Current: 606/3
• CPC Class Codes: A61B 2017/00061 spectrum
• CPC Class Codes: A61B 3/1241 specially adapted for observation of ocular blood flow, e.g. by fluorescein angiography
• CPC Class Codes: A61F 2009/00863 Retina
• CPC Class Codes: A61F 9/008 using laser
• CPC Class Codes: G02B 21/082 for incident illumination only
• CPC Class Codes: G02B 21/18 Arrangements with more than one light path, e.g. for comparing two specimens
• CPC Class Codes: G02B 21/22 Stereoscopic arrangements
• CPC Class Codes: G02B 21/361 Optical details, e.g. image relay to the camera or image sensor G02B21/364 takes precedence; illumination details G02B21/06 and subgroups

Abstract

A medical optical system includes an observation optical system for guiding light emitted from a light source to a predetermined part to be illuminated, and causing light reflected from the predetermined part to be incident on the observation optical system. The medical optical system further includes a light separator, a guide optical system, and a display unit. The light separator is disposed at an intermediate part of the observation optical system, for separating the reflected light into reflected light of a visible observation wavelength area to be passed therethrough and reflected light or fluorescent light of the other wavelength area to be extracted therefrom. The guide optical system guides the light separated and extracted by the light separator to an image pick-up device so that an image of the separated light is formed on the image pick-up device. And the display unit displays the separated light image picked up by the image pick-up device.

Claims

1. A surgical stereoscopic microscope comprising an illumination optical system for guiding light emitted from a light source to a predetermined part to be illuminated, and right and left optical systems each having an occular lens for observation of the predetermined part and located at one end of an optical path having a variable lens and an eye width adjusting prism, light reflected from said predetermined part entering the right and left optical systems, said surgical stereoscopic microscope further comprising:

an electronic image pick-up optical system disposed along the optical path of each of said right and left optical systems, said electronic image pick-up optical system including light separation means for extracting only infrared fluorescent light entering said right and left optical systems from said predetermined part from between the variable lens and the eye width adjusting prism of the optical path of each of said right and left optical systems;

an infrared fluorescent light image pick-up TV camera to receive light reflected from said predetermined part and guided by said electronic image pick-up optical systems;

a pair of display means for displaying an image of said predetermined part formed on said infrared TV camera simultaneously with observation of the predetermined part at the ocular lenses of said right and left optical systems; and

movable mirror means, located between the variable lens and the eye width adjusting prism of the optical path of each of said right and left optical systems, for guiding an infrared fluorescent light image of said predetermined part displayed on said display means to ocular lenses of said right and left optical systems when said movable mirror means is inserted in each optical path of said right and left optical systems, so that the infrared fluorescent light image of said predetermined part is presented at the ocular lenses of both said left and right optical systems, and simultaneously, a visible light image of said predetermined part is presented at the ocular lenses of both said left and right optical systems, whereby the infrared fluorescent light image and the visible light image of said predetermined part are superimposed upon each other and stereoscopically observed.

2. A surgical stereoscopic microscope according to claim 1, wherein said light source includes a white illumination light source for emitting a white illumination light beam and an infrared illumination light source for emitting an infrared excitation light beam, and visible and infrared laser light sources each having a different wavelength for illuminating said predetermined part, the light beams emitted from said white illumination light source, infrared illumination light source, visible laser light source, and infrared laser light source being guided to said predetermined part by an optical fiber.

3. A surgical stereoscopic microscope according to claim 1, wherein said light source includes a visible laser light source and an infrared laser light source each having a different wavelength for illuminating said predetermined part, the light beams emitted from said visible laser light source and infrared laser light source being guided to said predetermined part by an optical fiber.

4. A surgical stereoscopic microscope according to claim 3, wherein at least one of said laser light sources is controlled by a control circuit to selectively emit an aiming light beam having a low emissive intensity for illuminating said predetermined part or a treatment laser light beam having a high emissive intensity for treating said predetermined part.

5. A surgical stereoscopic microscope comprising an illumination optical system for guiding light emitted from a light source to a predetermined part of an eye fundus to be illuminated, and right and left optical systems each having an occular lens for observation of the predetermined part and located at one end of an optical path having a variable lens and an eye width adjusting prism, light reflected from said predetermined part entering the right and left optical systems, said surgical stereoscopic microscope further comprising:

an electronic image pick-up optical system disposed along the optical path of each of said right and left optical systems, said electronic image pick-up optical system including light separation means for extracting only infrared fluorescent light entering said right and left optical systems from said predetermined part from between the variable lens and the eye width adjusting prism of the optical path of each of said right and left optical systems;

an infrared fluorescent light image pick-up TV camera to receive light reflected from said predetermined part and guided by said electronic image pick-up optical systems;

a pair of display means for displaying an image of said predetermined part formed on said infrared TV camera in simultaneously with observation of the predetermined part at the ocular lenses of said right and left optical systems; and

means, disposed between the variable lens and the eye width adjusting prism of the optical path of each of said right and left optical systems, for guiding an infrared fluorescent light image of said predetermined part displayed on said display means to the ocular lenses of said right and left optical systems so that the infrared fluorescent light image of said predetermined part is stereoscopically observed.

6. A surgical stereoscopic microscope according to claim 5, wherein said light source includes a visible laser light source and an infrared laser light source each having a different wavelength for illuminating said predetermined part, the light beams emitted from said visible laser light source and infrared laser light source being guided to said predetermined part by an optical fiber.

7. A surgical stereoscopic microscope according to claim 5, wherein said light source includes a white illumination light source for emitting a white illumination light beam and an infrared illumination light source for emitting an infrared excitation light beam, and visible and infrared laser light source each having a different wavelength for illuminating said predetermined part, the light beams emitted from said white illumination light source, infrared illumination light source, visible laser light source, and infrared laser light source being guided to said predetermined part by an optical fiber.