JPH0447401B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an automatic depth of focus adjustment method in a medical shadowless illumination device, and in particular to a method for automatically adjusting the depth of focus in a medical shadowless illumination device. The present invention relates to an automatic depth of focus adjustment method in a medical shadowless illumination device that can be automatically moved based on the light emitted from a light emitter.

[Prior Art] Medical shadowless illumination devices for illuminating a subject during surgery are generally known.

This type of device is required to be able to illuminate the treatment area in a shadowless state and to be able to adjust the depth of focus as desired by the practitioner.

This type of conventional medical shadowless illumination device has an illumination lamp with a plurality of illumination bulbs whose optical axis can be moved. , the practitioner brings a portable light emitter, which is constructed separately from the illumination lamp, to a desired position in the treatment area, and the light from this emitter is received and collected by a light receiver attached to the illumination lamp. It is known that the focal position can be adjusted by specifying the light position and moving the optical axis of the illumination bulb (Japanese Patent Publication No. 61-13817 and Publication Utility Model Publication No. 54-30864).

However, bringing the light emitting device into direct contact with the treatment area may cause secondary infection during surgery.
The light emitting device is located slightly above the treatment area, and does not allow it to get too close to the treatment area.

Therefore, each of the above-mentioned devices has the problem that the light is focused slightly above the area where the light should be directly focused, and in order to correct this, other correction means must be taken. There is also the problem of not being able to do so.

In contrast, the light from the light emitter is emitted toward the treatment area, the reflected light is received by the light receiver built into the illumination lamp, the light collection position is specified, and the optical axis of the illumination bulb is moved. A medical shadowless illumination device in which the focal point position can be adjusted has also been proposed (Japanese Patent Application Laid-open No. 226031/1983).

With this type of device, the light waves are simply reflected at the treatment area, so there is no risk of direct contact with the treatment area, and secondary infection can be reliably prevented, and the position where you want the light to be focused does not shift. There is an advantage.

[Problems to be Solved by the Invention] However, each of the medical shadowless illumination devices proposed above can reliably automatically focus light in the X-axis and Y-axis directions, but cannot focus the light in the Z-axis direction. The problem is that it is not possible to automatically focus the light, or even if it is possible, it is not possible to precisely adjust the depth of focus.

That is, in each of the above-mentioned conventional devices, in order to adjust the focusing position in the direction perpendicular to the subject on the operating table, the light receiver is on the focal point movement axis (Japanese Patent Laid-Open No. 61-226031). The light emitter emits light from outside the housing of the illumination lamp (Japanese Patent Application Laid-Open No. 61-226031, Publication No. 54 of 1982)
-30864 Publication), the focus movement axis and the light emission angle are relatively large, and if the surgical site is deep within the patient, the light source must be moved almost directly above the surgical site. The optical axis does not reach deep into the surgical area. However, such movement of the light emitter not only interferes with the shadowless effect of the shadowless illumination lamp, but also may cause problems during the treatment, resulting in the problem that sufficient depth of focus cannot be adjusted during the treatment. be.

If this vertical focusing point position cannot be adjusted sufficiently, for example, in open surgery, the light may be focused on the treatment area during laparotomy, but after the laparotomy the light should be focused on the deeper part. Despite the shift, the light is no longer focused on the deepest part, and when adjusting the focal position during surgery, the surgery must be interrupted, or the surgery can be continued with the shadowless effect reduced, and the surgical assistant can be asked to adjust the focal position. Problems arise, such as the operator not being able to concentrate on the surgery.

In addition, in the above-mentioned proposed medical shadowless illumination device, the focal point cannot be moved in the Z-axis direction unless the light from the light emitter is applied to the treatment area from the outside or the light emitter is moved along the optical axis of the illumination lamp. There is a problem that not only is it not done, but it is not done automatically.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional techniques, and to eliminate the need to apply light from a light emitting device to the treatment area from the outside, and to utilize light emitted from a light emitting device installed in the lighting device itself. An object of the present invention is to provide an automatic depth of focus adjustment method in a medical shadowless illumination device that allows automatic focus movement in the Z-axis direction.

[Means for Solving the Problems] In order to achieve the above object, the present invention creates a focal point by aligning the optical axes of a plurality of illumination bulbs at appropriate positions on the focal point movement axis, and Each illumination bulb is installed in the housing so that the focal point is displaced in conjunction with the focal point movement axis, and the illumination bulb is installed in the housing so that the focal point of each illumination bulb is displaced in conjunction with the displacement of the focal point from an appropriate angle away from the focal point movement axis. Attach a Z-axis receiver whose central axis is displaced along the focus movement axis,
Furthermore, a light emitter is installed on the focal point movement axis in the housing, and the light reflected from the treatment area emitted from the light emitter is received by the Z-axis light receiver, and the direction of this light receiver is automatically controlled. The device is characterized in that the direction of the illumination sphere is also displaced with respect to the focus movement axis at the same time as the device displaces it with respect to the focus movement axis, so that the focus is automatically moved in the Z-axis direction. be.

[Operation] According to the present invention, when the light emitted from the light emitter disposed at the center hits the treatment area, this light is reflected by the treatment area and is received by the Z-axis light receiver.

When the light is received here, the Z-axis light receiver is displaced by the automatic control device so as to face the direction to be adjusted, and along with this displacement, the illumination bulb is also displaced,
As a result, the focal point is automatically moved in the Z-axis direction with respect to the treatment area.

[Example] Hereinafter, an example of an automatic depth of focus adjustment method in a medical shadowless illumination device according to the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 indicates a housing of an illumination lamp, and this housing 1 includes a plurality of illumination bulbs 2, 2, .
2 is installed.

The illumination bulb 2 is connected via a link 3 to a connecting ring 5 disposed concentrically on the center side of the housing 1, and this connecting ring 5 is connected to a drive motor 6, which is driven. , the connecting ring 5 is rotated, and the illumination bulb 2 is connected via the link 3.
, that is, the optical axis a is displaced with respect to the central axis of the housing 1, that is, the focus movement axis b.

The optical axis a of each illumination sphere 2 is made to coincide with a desired position of the focal point movement axis b to form a focal point.

Further, when the Z-axis light receiver 7 is connected to the connection ring 5 via the link 8 so as to be located on the same circumference as the illumination bulb 2, and the drive motor 6 is driven,
The direction of the Z-axis light receiver 7 as well as the illumination bulb 2, that is, the central axis c, is displaced with respect to the central axis of the housing 1, that is, the focus movement axis b.

Further, a light emitter 9 for emitting light toward the treatment area M (see FIG. 2) is attached to the center of the housing 1, that is, the focus movement axis b at the center of the circle. FIG. 2 is an explanatory diagram illustrating how light is focused on the treatment area.

The light from the light emitter 9 is reflected by the treatment area M and is directed to the above Z
The light is received by the shaft light receiver 7.

This Z-axis light receiver 7 is composed of a lens 11 and a photodiode sensor 12, as shown in FIGS. 3a and 3b, and this sensor 12 has a positive region and a It is divided into a negative area and a negative area.

When the image is focused on the positive region or the negative region, the drive motor 6 is driven by the automatic control device until the image is focused on the point Q, as will be described later, and the Z-axis light receiver 7 is displaced, and the illumination bulb 2 is also displaced together with this, so that the light is automatically focused on the treatment area M.

When the housing 1 is in the position indicated by the dotted line, the light from the illumination bulb 2 is focused on point A of the treatment area M.

The light from the light emitter 9 is then
The light is received by the shaft light receiver 7.

Here, if the practitioner wants to focus the light on point B of the treatment area M, the X-axis and Y-axis light receivers (not shown) receive the light from the external light emitter (not shown), By receiving this light, the X-axis and Y-axis motors (not shown) are driven, and the housing 1 is moved to the position shown by the solid line so that the illumination bulb 2 moves toward the point B of the treatment area M.

This causes the light to be focused horizontally on the treatment object, but since focusing the light in the horizontal direction is not an important part of this embodiment, a detailed explanation will be omitted.

From this state, according to this embodiment, the focal point is automatically moved in the Z-axis direction, that is, the focal point is moved in the direction of the central axis b of the housing 1 with respect to the treatment object.

As described above, the light from the light emitter 9 is received by the Z-axis light receiver 7.

When this light receiver 7 forms an image on the sensor 12,
If the imaging point is in the positive or negative region, the drive motor 6 is driven until the imaging point moves to point Q (FIG. 3b), and the Z-axis light receiver 7 is displaced, the illumination sphere 2 is also displaced together with this, and the focus is automatically moved to point B on the treatment area M.

FIG. 4 is an explanatory diagram illustrating a state in which light is automatically focused on the treatment area M when performing laparotomy or the like.

Here, the housing 1 is provided with a switch 15, and this switch 15 is provided with an up button 16, a down button 17, and an autofocus button 18.

To move the focus of the light that was focused on the deep part N of the body to be treated at the time of laparotomy to the surface M of the body to be treated at the time of suturing, the light is emitted from the light emitter 9 by pressing the autofocus button 18, and this light is is reflected by the surface M of the treatment object and received by the Z-axis light receiver 7, the illumination sphere 2 is displaced as described above, and the focus is automatically moved to the treatment area M.

If you want to move the focus further above the treatment area M, press the up button 16, and if you want to move the focus further below from the treatment area M, press the down button 17.

The autofocus button 18 can be left on at all times, and in this way, it will automatically track and adjust the depth of focus during instrument preparation and adjustment during surgery, or when moving the treatment area. is also done automatically.

FIG. 5 is a block diagram.

When the autofocus button 18 of the switch 15 is turned on, the transmitter circuit 20 is activated and the light emitter 9 emits light.

When the light reflected from the treatment area M is received by the Z-axis light receiver 7, it is subjected to signal processing.

The signal from the Z-axis light receiver 7, whether in the positive region (+Z) or in the negative region (-Z), is sent from the signal amplification circuit 21 to the detection circuit 22, and further to the central processing circuit 23. The signal is then sent to the output control circuit 24 from here.

Current is sent from the transformer 25 to the output control circuit 24 via the DC stabilizing power supply circuit 26, where it is controlled and sent to the Z-axis drive motor _Mz , and the Y-axis clutch _Cz is activated as necessary. It is driven by

Further, the current of the drive source is sent to the signal amplification circuit 21, the detection circuit 22, and the central processing circuit 23 via the DC stabilized power supply circuit 26.

If the light received by the Z-axis light receiver 7 is in the positive region (+Z), the Z-axis drive motor _Mz is driven via the above-mentioned control circuit, and the Z-axis light receiver 7 until the image is formed on the point Q of the sensor 12 of
The direction of the illumination sphere 2 is adapted to be displaced.

Furthermore, even in the negative region (-Z), the direction of the illumination sphere 2 is displaced until the image is formed on the point Q of the sensor 12 of the Z-axis light receiver 7, as described above. There is.

When the up button 16 or down button 17 of the switch 15 is turned on, the output control circuit 2
4, the Z-axis drive motor Mz is driven, and the focus moves up or down along the focus movement axis b.

In this embodiment, the illumination bulbs 2 are arranged on the same circumference, but even if they are arranged linearly or irregularly, the focal point created by them can move in the same direction at the same time. As long as it is configured, it does not matter how it is installed.

[Effects of the Invention] As is clear from the above explanation, according to the method of the present invention, the light emitting device is provided on the focal point movement axis within the housing, so that the treatment area can be shallowly and deeply located directly under this focal point movement axis. The deepest part of the treatment area can be irradiated according to the treatment area without any special measures, and the best illumination can always be achieved. Z provided at an appropriate angle from the focus movement axis
The light is received by the axial light receiver, which allows the direction of the light receiver to be changed and at the same time the direction of the illumination bulb to be changed, automatically and reliably providing shadowless illumination to the treatment area in the Z-axis direction. This has the advantage that the focus can be easily shifted during the treatment without interfering with the shadowless effect of the light, allowing the practitioner to concentrate on the treatment.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a device used in the automatic depth of focus adjustment method in a medical shadowless illumination device according to the present invention, FIG. 2 is an explanatory diagram illustrating focus movement to a treatment area, and FIG. Figures a and b are explanatory diagrams explaining the structure of the Z-axis light receiver, and Figures 4 a and b are explanatory diagrams illustrating how the light is automatically focused on the treatment area when performing laparotomy, etc., and the switch. Detailed drawing of 5th
The figure is a block diagram for explaining a circuit of a device used in the automatic depth of focus adjustment method in a medical shadowless illumination device according to the present invention. 1... Housing, 2... Lighting bulb, 3, 8...
Link, 5... Connection ring, 6... Drive motor,
7... Z-axis light receiver, 9... Emitter, a... Optical axis, b... Focus movement axis.

Claims (1)

[Claims] 1. A focal point is created by aligning the optical axes of a plurality of illumination spheres at appropriate positions on the focal point movement axis, and the focal points of these illumination spheres are displaced in conjunction with each other along the focal point movement axis. Each illumination bulb is installed in the housing, and within the housing there is a Z-axis whose central axis is displaced along the focal point movement axis in conjunction with the displacement of the focal point of each illumination sphere from an angle appropriately separated from the focal point movement axis. A light receiver is attached to the Z-axis light receiver, and a light emitter is mounted on the focus movement axis in the housing, and the reflected light from the treatment area is received by the Z-axis light receiver. The focus is automatically moved in the Z-axis direction by displacing the direction of the instrument with respect to the focus movement axis using an automatic control device and simultaneously displacing the direction of the illumination sphere with respect to the focus movement axis. A method for automatically adjusting depth of focus in a medical shadowless illumination device, characterized by: 2. The automatic depth of focus adjustment method in a medical shadowless illumination device according to claim 1, wherein the light emitter is configured to emit light at all times. 3. The automatic depth of focus adjustment method in a medical shadowless illumination device according to claim 1, wherein the light emitter is configured to emit light manually.