JPH05344997A - Medical stereoscopic microscope - Google Patents

Abstract

PURPOSE:To observe a part to be observed in electronic form in accordance with each wave length even in the use of the wave length which can not be observed by naked eyes or the wave length of the visible light, by installing a plurality of electronic image pick-up means having different wave length sensitivity. CONSTITUTION:This medical stereoscopic microscope K is equipped with a radiation mechanics system, main observation mechanics system 2, subobservation mechanics system 3, and an electronic image pick-up optical system 4. The electronic image pick-up optical system 4 is equipped with a beam splitter 41, image focusing lens 60, and a wave length separating prism 61, and the wave length separating prism 61 has a dichroic surface 63a which reflects the light in a wave length region of 650nm or less and transmits the light in a wave length region over 650nm. The light reflected on the dichroic surface is image-focused to form an observed image in the area CCD64a of a color TV camera 64, and the light which passes through the dichroic surface is image-focused to form the observed image in the area CCD65a of an ultrared TV camera 65. The image signals supplied from the TV cameras 64 and 65 are inputted into a monitor TV 67 through a control circuit 56, and the image of the observed part is displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical stereomicroscope having an electronic image pickup device for electronically picking up an image of an observed region.

[0002]

2. Description of the Related Art In this type of medical stereomicroscope, illumination light from an illumination light source is projected onto an observation site through an illumination optical system, and an observed image due to reflected light from the observation site is used as a main observation optical system. By guiding to the eyepiece through the two main optical paths of the system, the operator can observe the observation site (for example, the operation site) with the binocular.

Moreover, since the surgical assistant cooperates with the operator to perform the surgery, it is necessary to observe the observation site in the same manner as the operator. Therefore, the stereoscopic microscope for medical use is provided with a sub-observation optical system that branches from the middle of one of the main optical paths so that an assistant for surgery can observe the observation site.

Further, as a recent treatment method, infrared light or light in a wavelength range where the human eye has low sensitivity such as near 400 nm or 700 nm or has no sensitivity (hereinafter, these are collectively referred to as invisible light). Called) is increasing. For example, in brain surgery, infrared laser light is used to perform surgery to remove malignant tumors and to suppress the progress of retinal detachment in ophthalmology by utilizing the property that fluorescent substances selectively remain in cancer cells. Therefore, photocoagulation surgery of the deep layer of the retina is performed.

[0005]

However, since the sensitivity of the human eye to invisible light is low, ordinary observation is difficult even if the surgery using this light is directly observed with the naked eye.

Therefore, in order to observe the operation using such invisible light, a part of the reflected light from the observation site is extracted from the other optical path of the main observation optical system, and the TV is sensitive to, for example, ultraviolet light. It is conceivable to guide the camera to a camera or a TV camera that is sensitive to infrared light so that the observed part is photographed by the TV camera and displayed on the monitor TV.

[0007] In this case, it is desirable to be able to photograph the observation site with visible light and invisible light at the same time. In some cases, it is desirable to be able to simultaneously perform imaging with a plurality of invisible lights having different wavelengths.

In view of this, the present invention meets this need and uses a wavelength (for example, infrared light) that cannot be observed by the naked eye by providing a plurality of electronic image pickup means having different wavelength sensitivities. It is an object of the present invention to provide a medical stereomicroscope capable of electronically observing an observation site according to each wavelength even when a wavelength such as visible light is used.

[0009]

In order to achieve this object, the present invention provides an illumination optical system for projecting illumination light from an illumination light source onto an observation site, and an image to be observed by reflected light reflected from the observation site. A main observation optical system provided with two main optical paths, an electronic imaging optical system branched from the middle of the main optical path, and an electronic imaging means for forming an observed image guided by the electronic imaging optical system. In the medical stereoscopic microscope, the electronic image pickup means is a medical stereoscopic microscope including a plurality of electronic image pickup devices having different wavelength sensitivities.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] In FIGS. 1 and 2, OP is an observation site such as the fundus of the eye to be inspected or another operation site, and K is a stereoscopic microscope for observing the observation site. This medical stereoscopic microscope K includes an illumination optical system 1 provided in a housing H.
(See FIG. 2), main observation optical system 2, sub-observation optical system 3
(See FIG. 1), and has an electronic imaging optical system 4.

The illumination optical system 1 is an illumination system 1a for observation and photography.
And an illumination system 1b for photographing. The illumination system 1a includes a halogen lamp 10, an illumination lens 11, a prism 12,
The objective lens 13 is provided in this order. Illumination light from the halogen lamp 10 includes an illumination lens 11, a prism 12,
The observation site OP is illuminated via the objective lens 13. The halogen lamp 10 is controlled to emit light by a CCU (control circuit unit), that is, a control circuit 66.

The illumination system 1b includes a mercury-xenon lamp 20, a light guide 21, an exciter filter 22 for transmitting only excitation light of 650 nm, a condenser lens 23,
It has a quick return mirror 24, a prism 12 and an objective lens 13 in this order. This exciter filter 2
2 transmits infrared light. Moreover,
When a button (not shown) is pressed, the control circuit 66 activates the solenoid S to insert the quick return mirror 24 into the light path of the illumination system 1a, and at the same time, the halogen lamp 1
0 is turned off to control the light emission of the mercury xenon lamp 20.

Then, the solenoid 24 is actuated to insert the quick return mirror 24 into the optical path of the illumination system 1a as indicated by the solid line, and the mercury-xenon lamp 20 is caused to emit light in this state. Through the light guide 21 to the exciter filter 2
Guided to 2 and set the exciter filter 22 to 650
Only the light of nm is transmitted and this light is collected by the condenser lens 2
3, the observation site OP is irradiated through the quick return mirror 24, the prism 12, and the objective lens 13. Then, this irradiation excites the fluorescent substance existing at the observation site and emits fluorescence longer than 650 nm.

The main observation optical system 2 has two left and right main optical paths, that is, optical systems 2a and 2b for making a binocular.
The optical system 2a includes an objective lens 13, a variable power lens 30, a beam splitter 31, an imaging lens 32, and an erecting prism 3.
3, a rhombus prism 34 for adjusting the interpupillary distance, and an eyepiece lens 35 are provided in this order. The optical system 2b includes an objective lens 13, a variable power lens 40, and a beam splitter 4 as in the optical system 2a.
1, an image forming lens 42, an erecting prism 43, a prism 44 for adjusting the interpupillary distance, and an eyepiece lens 45 in this order.

The image to be observed by the reflected light from the observation region OP is observed by both eyes of the operator through the left and right optical systems 2a and 2b.

Further, in the housing H, small-diameter lens barrel parts h1 and h2 are provided so as to project laterally corresponding to the beam splitters 31 and 41, and the sub-observation optical system 3 is provided in the lens barrel part h1.
And the electronic image pickup optical system 4 is provided in the lens barrel h2.

The sub-observation optical system 3 includes a beam splitter 3
1, an imaging lens 50, a reflection mirror 51, an optical member (not shown), and an eyepiece lens 52. Then, the observed image by the reflected light from the observation region OP is the objective lens 13,
Variable magnification lens 30, beam splitter 31, imaging lens 5
0, a reflection mirror 51, an optical member (not shown), an eyepiece lens 52, etc., and is observed by a surgical assistant.

The electronic imaging optical system 4 includes a beam splitter 4
1, an imaging lens 60, and a wavelength separation prism 61 in this order. The wavelength separation prism 61 is the roof prism 6
2, a wedge prism 63 and a trapezoidal prism 64 are bonded together.

Moreover, a dichroic surface 63a is formed at the bonding portion of the roof prism 62 and the wedge prism 63. As shown by the characteristic curve W in FIG. 3, the dichroic surface 63a reflects light in the wavelength range of about 650 nm or less and transmits light in the wavelength range exceeding this. The light incident on the wavelength separation prism 61 and reflected on the dichroic surface 63a is reflected by the color TV camera 64.
And enters an image to be observed on the area CCD 64a of the color TV camera 64. Further, the light that has entered the wavelength separation prism 61 and transmitted through the dichroic surface 63a is infrared.
Area CCD of the infrared TV camera 65 after entering the TV camera 65
An image to be observed is formed on 65a.

The TV cameras 64 and 65 are fixed to the lens barrel portion h2. Further, the wavelength separation prism 61 as described above is used for the purpose of reflecting the incident light to the wavelength separation prism 61 an odd number of times, and for the purpose of avoiding interference between the TV cameras 64 and 65, it is close to the lens barrel part h2. This is to install it.

Image signals from the TV cameras 64 and 65 are input to a monitor television 67 via a CCU (control circuit unit), that is, a control circuit 66,
An image of the observed portion is displayed on the monitor television 67.

Next, the operation of the medical stereoscopic microscope having such a configuration will be described.

(Observation during illumination by the illumination system 1a) During normal observation, the control circuit 66 controls the quick return mirror 2
4 is removed from the optical path of the illumination system 1a as indicated by the broken line in FIG. 2, and the halogen lamp 10 is turned on in this state. The illumination light from the halogen lamp 10 is used for the illumination lens 1
1, observation part O through prism 12, objective lens 13
Illuminate P. The observed image due to the reflected light from the observation site OP is observed by both eyes of the operator via the left and right optical systems 2a and 2b.

On the other hand, the reflected light from the observation region OP is the objective lens 13, the variable power lens 40, the beam splitter 41,
The light enters the wavelength separation prism 61 via the imaging lens 60. The visible light of the light reflected by the wavelength separation prism 61 is reflected by the dichroic surface 63a and enters the color TV camera 64, and the area CCD 64 of the color TV camera 64 is reflected.
The observed image is formed on a.

(Photographing when illuminated by the illumination system 1a)
For example, at the time of shooting, the wavelength of 650 nm is absorbed to absorb 650n.
A fluorescent agent that emits excitation light with a wavelength of more than m is intravenously injected into the patient.

In this state, a photographing switch (not shown) is turned on.
Then, the control circuit 66 operates the solenoid 24 to move the quick return mirror 24 to the illumination system 1a as indicated by the solid line.
Then, the mercury-xenon lamp 20 is caused to emit light.

Illumination light from the mercury-xenon lamp 20 is passed through a light guide 21 and an exciter filter 2 is provided.
Guided to 2 and set the exciter filter 22 to 650
Only the light of nm is transmitted and this light is collected by the condenser lens 2
3, the observation site OP is irradiated through the quick return mirror 24, the prism 12, and the objective lens 13. Then, this irradiation excites the fluorescent substance existing in the observation site of the patient and emits fluorescence longer than 650 nm.

Then, the reflected light (excitation light) and fluorescence from the observation region OP enter the wavelength separation prism 61 via the objective lens 13, the variable power lens 40, the beam splitter 41, and the imaging lens 60. The light having a wavelength of 650 nm that has entered the wavelength separation prism 61 is dichroic surface 63.
The light is reflected by a and enters the visible TV camera 64.

On the other hand, 6 incident on the wavelength separation prism 61
Light with a wavelength of more than 50 nm is used for the dichroic surface 63a.
And is incident on the infrared TV camera 65 to form an observed image on the area CCD 65a of the infrared TV camera 65. The image signal from this TV camera 65 is CC
It is input to the monitor television 67 via a U (control circuit unit), that is, the control circuit 66, and an image of fluorescence of the observation site is displayed on the monitor television 67.

The area CCD 64 of the visible TV camera 64
For a, use one that is sensitive to wavelengths of 650 nm or less,
If the exciter filter 22 that transmits a wavelength of 650 nm or less is used, the reflected light from the observation region OP is incident on the wavelength separation prism 61, and the light of the wavelength of 650 nm or less is reflected by the dichroic surface 63a and is reflected by the visible TV camera 64. Incident on the area of the visible TV camera 64 CCD 64a
The image to be observed is formed on the screen. An image signal from the TV camera 64 is input to a monitor television 67 via a CCU (control circuit unit), that is, a control circuit 66, and the monitor television 67 displays a whole image by reflected excitation light of an observed portion.

Therefore, the whole image of this TV camera 64
The position of the fluorescent image can be known by combining the fluorescent image from the TV camera 65.

If the exciter filter 22 is omitted during photographing, the visible TV camera 64 can perform color photographing and the infrared TV camera 65 can photograph infrared light images.

[Second Embodiment] In the above-described embodiment, the wavelength separation prism 61 is used to cause the TV cameras 64 and 65 to separately guide visible light and infrared light. However, the present invention is not limited to this. For example, it may be configured as shown in FIGS. 4 and 5.

In this embodiment, the color TV camera 64 and the infrared
With the optical axes O1 and O2 of the TV camera 65 and the optical axis O of the imaging lens 60 orthogonal to each other, the color TV camera 6
4 and the infrared TV camera 65 are attached to the lens barrel h2.
Further, a light beam guiding means, that is, a slanting mirror 68, which replaces the wavelength separation prism 61, is arranged at the intersection of the optical axes O, O1, O2 in the lens barrel portion h2 so as to be rotatable around the optical axis O. Has been done. This oblique mirror 68 is provided with a control circuit 66.
Output shaft 69a of the pulse motor 69 driven and controlled by
It is fixed to. Between the oblique mirror 68 and the infrared TV camera 65, as shown by the characteristic curve BW in FIG.
A barrier filter 70 capable of transmitting light in the wavelength range of 0 nm or more is provided.

Moreover, the control circuit 66 pushes the button (not shown) of the first embodiment to push the quick return mirror 23.
Is inserted in the optical path of the illumination system 1a, the halogen lamp 10 is turned off and the mercury xenon lamp 20 is controlled to emit light, the pulse motor 69 is operated, and the reflected light can be guided to the infrared TV camera 65 side. The oblique mirror 68 is directed toward the infrared TV camera 65 side.

Further, when the control circuit 66 removes the quick return mirror 23 from the middle of the optical path of the illumination system 1a as shown by the broken line, the mercury xenon lamp 20 is turned off, the halogen lamp 10 is controlled to emit light, and the pulse motor 69 is operated. The oblique mirror 68 is directed to the color TV camera 64 side so that the reflected light can be guided to the color TV camera 64 side.

[Other Embodiments] In the embodiments described above, the 650 nm excitation light image reflected from the observation part and the fluorescence image emitted from the observation part by this excitation light are taken by the TV cameras 64, 6.
5, and a composite image of these two images is displayed on the monitor television 67, or an image of the observation portion by visible light and the fluorescent image are captured by the TV cameras 64 and 65, and the two images are combined. Monitor image on TV 6
Although the example in which the image is displayed in FIG. 7 has been described, it is not necessarily limited to this combination.

For example, in the first embodiment, two TV cameras 6 display a color image by visible light and an ultraviolet light image by ultraviolet light.
The dichroic surface 63a allows you to shoot with 4 and 65 respectively.
May be provided with an interference film, or an interference film may be provided on the dichroic surface 63a so that an infrared light image by infrared light and an ultraviolet light image by ultraviolet light can be photographed by the two TV cameras 64 and 65, respectively.

Further, as shown in FIG. 7, the rhombic prism 3
An internal display system including a right-angled prism 70 bonded to the upper part of 4, a focusing lens 71, and a color liquid crystal display 72 is provided, and a monitor circuit 67 is provided by a control circuit 66.
The same image as that may be displayed on the color liquid crystal display 72. Display ON in this case
-The observer may arbitrarily turn the switch off by operating the switch.

[0041]

As described above, according to the present invention, the illumination optical system for projecting the illumination light from the illumination light source onto the observation site and the two main optical paths for guiding the observed image by the reflected light reflected from the observation site are provided. The main stereoscopic optical system provided, the electronic imaging optical system branching from the middle of the main optical path, and the electronic stereoscopic microscope for forming an observed image guided by the electronic imaging optical system. Since the image pickup means is composed of a plurality of electronic image pickup elements having different wavelength sensitivities, even when using a wavelength that cannot be observed with the naked eye (for example, infrared light) or when using a wavelength such as visible light, The observation site can be electronically observed according to each wavelength.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an example of an optical system of a medical stereoscopic microscope of the present invention.

FIG. 2 is a schematic explanatory view of a step surface taken along the line AA of FIG.

FIG. 3 is an explanatory diagram showing optical characteristics of the dichroic surface shown in FIG.

FIG. 4 is a schematic explanatory view showing another example of the optical system of the medical stereomicroscope of the present invention.

5 is a right side view of a portion of the TV camera shown in FIG.

6 is an optical characteristic curve diagram of the barrier filter of FIG.

FIG. 7 is a schematic explanatory view showing another example of the optical system of the medical stereomicroscope of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Illumination optical system 2 ... Main observation optical system 3 ... Sub-observation optical system 4 ... Electronic imaging optical system 10 ... Halogen lamp (illumination light source) 20 ... Mercury xenon lamp (illumination light source) 64a, 65a ... Imaging device (electronic imaging means) )

Claims (1)

[Claims] 1. An illumination optical system for projecting illumination light from an illumination light source onto an observation site, and a main observation optical system provided with two main optical paths for guiding an observed image by reflected light reflected from the observation site. In a medical stereomicroscope including an electronic imaging optical system branched from the middle of the main optical path and an electronic imaging unit for forming an observed image guided by the electronic imaging optical system, the electronic imaging unit has different wavelength sensitivities. A stereoscopic medical microscope characterized by comprising a plurality of electronic imaging devices.