JPH04109926A - Optical axis adjusting method for blood vessel endoscoping catheter - Google Patents

Abstract

PURPOSE:To allow for the install space of an optical axis adjusting mechanism and to improve the operability by providing an optical axis adjusting mechanism between an optical system of an eye piece and a television camera, and operating the optical axis adjusting mechanism while observing the screen of a monitor. CONSTITUTION:An image guide 1A forming a blood, vessel endoscoping catheter 1 is inserted in an eyepiece 2, light S2 from an illuminating light source 6 is applied to a subject 7 through a light guide 1B, an image formed by reflected light is conducted to the image guide 1A to enter the eyepiece 2. The coming image SO is passed through an optical system L and passed through a parallel plate glass G of an optical axis adjusting mechanism 3 to enter a solid state image pickup plate 4A of a television camera 4 to be converted to a video signal S1. The video signal S1 is inputted to a monitor 5 and image-processed to be displayed as an optical axis image 11 of the image guide. Simultaneously, when a switch is turned on, an optical axis image I2 of the eyepiece, taking the axis of abscissa as X and the axis of ordinate as Y, is displayed on the monitor 5. Though the optical axis image 12 is previously displayed on the central portion of the monitor 5, the optical axis adjusting mechanism 3 is operated in the case where the center 02 is not aligned with the center O1.

Description

Detailed Description of the Invention [I] Industrial Application Field The present invention provides an optical axis adjustment method for a catheter for vascular endoscopic vision, in particular, an optical axis adjustment method for a catheter for vascular endoscopic vision, in particular, by aligning the optical axis of an image guide with the optical axis of an eyepiece. The present invention relates to an optical axis adjustment method for a vascular endoscopic catheter that clearly displays the entire vascular lumen image in the center of a monitor screen.

(II) Prior art (1) Background of the invention - In IIR, a vascular endoscopic catheter is composed of a light guide and an image guide, and irradiates light from an illumination source to the lumen of a blood vessel via the light guide. An image of the illuminated blood vessel lumen is guided by an image guide and displayed on a monitor screen via an eyepiece.

In this case, the eyepiece may be used to enlarge the image of the blood vessel lumen and observe the affected area in detail.

Therefore, in order to increase the effectiveness of this observation and make it useful for accurate diagnosis and treatment, it is necessary to make sure that the entire magnified blood vessel lumen image can be completely fit on the monitor screen.

(2) Conventional Example An image guide constituting a conventional vascular endoscopic catheter had a structure shown in FIG.

In the figure, reference numeral 10 indicates an image guide 12 which is a fiber bundle, 14 a first cladding tube, and 16 a second cladding tube.

As shown in FIG. 5(A), the fiber bundle 12 consists of a plurality of fibers 12A, 12B, . . . , which are covered with a first cladding tube 14 via a filler 13.

Further, the first cladding tube 14 is covered with a second cladding tube 16 via a filler 15.

The second image guide 10 having such a structure
The outer surface 16A of the cladding tube 16 is inserted into the eyepiece 20 (FIG. 5(B)), and the blood vessel lumen image transmitted through the fiber bundle 12 is converted into an electrical signal by the CCD camera 3O.
It is displayed on the monitor screen.

(In) Problems to be Solved by the Invention In the conventional example shown in FIG.
If the inner center C2 of the image guide 10 and the optical axis A2 of the eyepiece 20 coincide with each other (FIG. 5(B)), the optical axis A1 of the image guide 10 and the optical axis A2 of the eyepiece 20 coincide with each other.

Therefore, the blood vessel lumen image i is displayed in the center of the monitor screen 40, and the image I obtained by enlarging this i is also displayed on the monitor screen 40.
displayed in the center of the screen.

However, in reality, there are manufacturing variations in the image guide 10, and the inner center C1 of the first cladding tube 14 is different from that of the second cladding tube 1.
It is eccentric with respect to the inner center C2 of 6 (FIG. 5(C)).

The degree of eccentricity is determined between the outer surface 14A of the first cladding tube 14 and the second cladding tube 14.
The distance between the inner surfaces 16B of the cladding tube 16 reaches a maximum of 1100a (FIG. 5(C)).

In this case, since the inner centers C1 and C2 of the multiple tubes 14 and 16 do not coincide, the optical axis Al of the image guide 10 also
0 does not coincide with the optical axis A2.

Therefore, the blood vessel lumen image i' is displayed offset from the center of the monitor screen 40, and the enlarged image of i' is displayed on the monitor screen 40.
Not all of them can fit into 0.

Since the eyepiece 20 and the CCD camera 30 can be integrally fixed in advance, their optical axes can be made to coincide.

That is, the above A2 is also the optical axis of the eyepiece 20,
It is also the optical axis of the CCD camera 30. However, since the image guide 10 must be inserted into the eyepiece 20 immediately before internal viewing of the blood vessel, the two cannot be fixed together in advance.

Therefore, without providing any adjustment mechanism, the image guide 1
0 into the eyepiece 20, it is actually difficult to align the optical axes of the two simply by inserting the image guide 100 into the eyepiece 20 due to variations in the precision of the parts and the processing precision of the image guide 100, as described above.

As described above, conventionally, due to mismatching of the optical axes between the image guide and the eyepiece, there has been a problem that the image of the vascular lumen is not displayed in the center of the monitor screen, making it impossible to use it for accurate diagnosis and treatment.

In order to solve this problem, the applicant of the present application disclosed an invention related to an optical axis adjustment method for a catheter for vascular endoscopic vision in a patent application filed on May 25, 1990.

According to this invention, an optical axis adjustment mechanism composed of a screw or the like is installed in front of the optical system of the eyepiece, and by operating the optical axis adjustment mechanism, the eyepiece optical axis image displayed on the monitor screen can be adjusted. The image guide optical axis images can be superimposed and the optical axis of the eyepiece and the optical axis of the image guide can be aligned. Mechanical means of displacing parts are used.

That is, by moving the image guide, the optical axis of the image guide is brought into alignment with the optical axis of the eyepiece.

Therefore, the installation space for the optical axis adjustment mechanism is limited to the space occupied by the image guide and its tightening, and there is not enough room.

Additionally, in this method, the position of the image guide moved by the optical axis adjustment mechanism and the position of the monitor screen where the optical axis image of the image guide is displayed are on opposite sides of the eyepiece optical system. , the range in which the optical axis image of the image guide displayed on the monitor screen moves is larger than the range in which the image guide moves.

In other words, even if the image guide is slightly moved by the optical axis adjustment mechanism, the image guide's optical axis image displayed on the monitor screen will move over a wide range, and the image guide's optical axis image may disappear from the monitor screen. .

Therefore, when operating the optical axis adjustment mechanism while viewing both the optical axis images of the image guide and the eyepiece displayed on the monitor screen, the operability is low.

An object of the present invention is to install an optical axis adjustment mechanism of a vascular endoscopic catheter with sufficient space and to improve the operability of the tip axis adjustment mechanism.

CI! ,') Means for solving the problem The above problem is to create a predetermined angle θ between the optical system of the eyepiece 2 into which the image guide 1A constituting the vascular endoscopic catheter 1 is inserted and the television camera 4. Optical axis adjustment mechanism 3 including a parallel flat glass G installed as shown in FIG.
The optical axis image I1 of the image guide 1A and the optical axis image I2 of the eyepiece 2 are displayed on the monitor 5 via the television camera 4, and the optical axis adjustment mechanism 3 is operated to display the optical axis image I2 on the monitor 5. By superimposing the optical axis image 11 of the image guide 1A on the displayed optical axis image 2 of the eyepiece 2, the optical axis OAI of the image guide 1A and the optical axis OA2 of the eyepiece 2 are made to coincide. This problem is solved by the optical axis adjustment method of the vascular endoscopic catheter.

(V) Effect As described above, according to the present invention, the eyepiece is installed between the optical system of the eyepiece 2 and the television camera 4 at a predetermined angle θ, and is rotatable about the longitudinal axis LA. Parallel flat glass G tiltable about the transverse axis TA
The optical axis OAI of the image guide 1A and the optical axis OA2 of the eyepiece 2 can be made to coincide by providing an optical axis adjustment mechanism 3 including an optical axis adjustment mechanism 3 and operating the optical axis adjustment mechanism 3 while looking at the screen of the monitor 5. .

According to this configuration, the optical axis adjustment mechanism 3 is installed between the optical system and the television camera 4, that is, at the rear of the optical system.

Moreover, this optical axis adjustment mechanism 3 is not a mechanical means of moving the image guide itself as in the past, but an optical method of changing the optical path of the optical axis OAI of the image guide 1A via the parallel flat glass G. This is an optical means that utilizes the refraction effect of

That is, when an axis misalignment occurs between the image guide 1A and the eyepiece 2 (FIG. 4(A)), when the parallel flat glass G forming a predetermined angle θ is rotated about the longitudinal axis LA (FIG. 4(A)), (B)) Accordingly, the image guide optical axis image 11 on the monitor 5 also rotates along the circle B indicating its initial position (■ to ■ in FIG. 4(B)).

Therefore, by rotating the parallel flat glass G, when the center 01 of the image guide optical axis image II intersects the eyepiece optical axis image I2 (■ in FIG. 4(C)), the parallel flat glass G is aligned with the horizontal axis. If it is tilted with respect to TA, the image guide optical axis image 11 will move up and down or left and right, as shown in Figure 4 (
In the case of C), move upward from ■ and come to position ■'),
Image guide optical axis image 1 with respect to eyepiece optical axis image I2
1 can be superimposed, thereby making it possible to match the optical axis OA1 of the image guide 1A and the optical axis OA2 of the eyepiece 2.

Therefore, unlike in the past, the optical axis adjustment mechanism 3 is not limited to the image guide and its tightening is limited to the space occupied by the image guide, and there is sufficient space between the optical system and the television camera 4. Now it can be installed.

In addition, the image guide optical axis image 1 after passing through the optical system
1 is rotated and moved vertically or horizontally on the monitor 5 by rotating and tilting the parallel flat glass G constituting the optical axis adjustment mechanism 3.

Therefore, there is no big difference between the range in which the parallel flat glass G moves and the range in which the image guide optical axis image 11 on the monitor 5 moves, and the image guide optical axis image disappears from the monitor screen as in the conventional case. Nothing happens.

Therefore, when operating the optical axis adjustment mechanism 3 while viewing the image guide optical axis image (1) and the eyepiece optical axis image (I2) displayed on the monitor 5, the operability has been significantly improved.

[VI) Examples The present invention will now be described by way of examples with reference to the accompanying drawings.

(1) Configuration FIG. 1 is an overall view showing an embodiment of the present invention.

In the same figure, reference numeral 1 indicates a vascular endoscopic catheter, and 2
is an eyepiece, 3 is an optical axis adjustment mechanism, 4 is a television camera,
5 is a monitor, 6 is an illumination source, and 7 is a subject.

The vascular endoscopic catheter 1 has an image guide 1A and a light guide IB, and the above-mentioned image SO is generated by reflected light when the light S2 from the illumination source 6 irradiates the subject 7 via the light guide IB. The eyepiece 2, which is guided by the image guide 1A, has the image guide 1A inserted in its front part and a television camera 4 fixed to its rear part, and uses an optical system to focus the image SO on the television. The optical axis adjustment mechanism 3 (Fig. 2, Figure 3) is provided.

The television camera 4 is a device that converts the image SO into a video signal S1, and is, for example, a CCD including a solid-state image pickup plate 4A.
A camera may also be used.

The monitor 5 displays the optical axis OA of the image guide 1A by displaying both the optical axis image 11 of the image guide 1A and the optical axis image 2 of the eyepiece 2 (so-called reticle display).
This is a device for checking whether or not I and the optical axis OA2 of the eyepiece 2 coincide.

FIG. 2 is a diagram showing a first embodiment of the present invention.

Figure 2 (A) is a schematic diagram of the optical axis adjustment mechanism 3, Figure 2 (B)
is a detailed view of the optical axis adjustment mechanism 3, FIG. 2(C) is a diagram showing the state of refraction of light by the optical axis adjustment mechanism 3, FIG. Figure (E) is a diagram showing the relationship between the installation angle θ of the parallel flat glass G constituting the optical axis adjustment mechanism 3 and the optical path change amount d.

The optical axis adjustment mechanism 3 includes a parallel flat glass G installed at a predetermined angle θ and rotatable about the longitudinal axis LA and tiltable about the transverse axis TA, and holds the parallel flat glass G. Rotate with (arrow α direction)
a rotating holder 3A that tilts the parallel flat glass G together with the rotating holder 3A (in the direction of arrow β);
It is composed of.

The parallel flat glass G is a flat cylindrical body (second
(D)), at a predetermined angle θ with respect to its longitudinal axis LA.
is installed on the rotating holder 3A (the first
Fig. 2(E)).

The reason why the parallel flat glass G is installed tilted by a predetermined angle θ is to rotate the parallel flat glass G with respect to the longitudinal axis LAN2 when an axis misalignment occurs (FIG. 4(A)). The optical axis image 1 of the image guide 1A is rotated on the screen of the monitor 5 using the refraction of light (Fig. 4 (B)).
), in order to intersect the optical axis image I2 of the eyepiece 2 (FIG. 4(C)).

In other words, as is well known, refraction of light is the phenomenon that occurs when the angle of incidence of light from one transparent medium (e.g., air) to another transparent medium (e.g., parallel plate glass) is not perpendicular. This is a phenomenon in which the direction of light travels changes.

In the present invention, by utilizing this refraction of light, the parallel flat glass G is installed so that the angle of incidence is not perpendicular to the parallel light beam, and the optical path is changed.

The relationship between the installation angle θ and the amount of optical path change d is well known, assuming that the thickness of the parallel flat glass G is h, and the refractive indexes of air and glass are nl and n2, respectively (Fig. 2 (E)). As shown, it is expressed by the following equation.

The rotating holder 3A has a knob 3A1 housed in the inclined holder 3B and loosely fitted into the through groove 3Bl of the inclined holder 3B. The rotating holder 3A and therefore the parallel flat glass G are rotated about the longitudinal axis ILA.

The tilted holder 3B has a pivot 3H relative to the fixed ring 3C.
The rotating shaft 3E of the gear 3D is in contact with the upper part when viewed from the drawing, and the pressing bar 3G is in contact with the lower part.

The pressing bar 3G always presses the lower part of the inclined holder 3B due to the spring action of the coil spring 3F.

Therefore, when the gear 3D is rotated, the rotating shaft 3E moves to the right or left in the drawing, so that the tilt holder 3B is tilted with respect to the transverse axis TA.

This inclined holder 3B is connected to the optical axis OAI of the image guide 1A and the eyepiece 2, as shown in FIG. 2(C)-(1).
If the optical axes OA2 of OA2 coincide with each other, that is, if there is no axis misalignment, rotate the gear 3D to tilt it upward in advance so that no refraction of light occurs at the parallel flat glass G. That's how it is.

However, when the axis misalignment occurs, if the tilt holder 3B is held at the same position (FIG. 2(C)-(2)), the light will not be refracted and the optical axis cannot be adjusted.

Therefore, if the gear 3D is rotated in the opposite direction and the tilted holder 3B is made to stand upright (Fig. 2 (C)-(3)), the light is refracted by the parallel flat glass G, and the optical axis OAI of the image guide 1A is The optical axis OA2 of the eyepiece 2 can be made to coincide with the optical axis OA2 of the eyepiece 2.

The optical axis adjustment mechanism 3 is actually provided in the base cylinder 2A of the eyepiece, as shown in the detailed view of FIG. It is rotatably supported by.

The knob 3A1 of the rotary holder 3A passes through the base tube 2A and is attached to a rotary ring 3J provided on the outer surface of the base tube 2A.
When the rotary ring 3J is rotated by hand, the rotary holder 3A and hence the parallel flat glass G are also rotated.

In addition, the gear 3D also passes through the base cylinder 2A, and the rotating ring 3
When the rotary ring 3K is rotated, the gear 3D rotates, thereby tilting the tilting holder 3B.

FIG. 3 is a diagram showing a second embodiment of the present invention, and FIG.
A) is a schematic diagram of the optical axis adjustment mechanism 3, FIG. 3(B) is a detailed diagram thereof, and FIG. 3(C) is an exploded perspective view thereof.

The first embodiment shown in FIG. 2 is the same in that it includes a parallel flat glass G and utilizes light refraction (FIG. 2 (C) and (E)), but the configuration of the optical axis adjustment mechanism 3 are different.

That is, the second embodiment includes a first rotating ring 3P rotatably attached to the base tube 2A, a second rotating ring 3Q rotatable with respect to the first rotating ring 3P, and a second rotating ring 3Q. and a holder 3R that is screwed together on its inner surface to hold the parallel flat glass G.

The first rotating ring 3P has an annular groove 3P2, and the groove 3P has an annular groove 3P2.
The annular end portion 3Q2 of the second rotating ring 3Q is loosely fitted into P2.

Furthermore, a threaded portion 3Q1 is provided on the inner surface of the second rotating ring 3Q in the circumferential direction, and the corresponding threaded portions 3R1 and 3R2 of the holder 3R are screwed together, respectively.

The holder 3R is connected to the first rotating ring 3P via the pivot 3S.
A parallel flat glass G similar to that of the first embodiment is provided.

When the first rotating ring 3P is rotated, the second rotating ring 3Q also rotates, and the holder 3R screwed onto the inner surface of the second rotating ring 3Q also rotates. G is adapted to rotate about the longitudinal axis LA (in the direction of arrow α).

On the other hand, while keeping the first rotating ring 3P stationary, the second rotating ring 3P
When only Q is rotated, the screw portions 3Q1 and 3R1, 3
Since R2 is engaged, the holder 3R rotates around the pivot 3S, and the parallel flat glass G is inclined with respect to the transverse axis TA (in the direction of arrow β).

(2) Effects Below, the effects of the present invention having the above configuration will be explained based on FIG. 4.

First, the image guide 1A constituting the vascular endoscopic catheter 1 is inserted into the eyepiece 2 (Fig. 1), the light S2 from the illumination source 6 is irradiated onto the subject 7 via the light guide IB, and an image SO is created by the reflected light. is guided by the image guide 1A and made incident on the eyepiece 2.

The image SO that has entered the eyepiece 2 passes through the optical system, passes through the parallel flat glass G of the optical axis adjustment mechanism 3, and enters the solid-state image pickup plate 4A of the television camera 4, where it is converted into a video signal S1.

The video signal S1 is input to the monitor 5, undergoes image processing, and is displayed as an optical axis image 11 of the image guide 1A (fourth
Figure (A)).

At the same time, when the switch is turned on, the horizontal axis is displayed on the monitor 5.
, an optical axis image I2 of the eyepiece 2 whose @ axis is Y is also displayed (FIG. 4(A)).

The optical axis image I2 of the eyepiece 2 is displayed in advance at the center of the monitor 5, but if its center 02 does not coincide with the center O1 of the optical axis image 11 of the image guide 1A, that is, the optical axis image I2 of the eyepiece 2 If the image guide optical axis images 11 do not overlap (FIG. 4(A)), the optical axis adjustment mechanism 3 is operated as follows.

In addition, in Fig. 4 (A), the image guide optical axis image ■1
corresponds to the first cladding tube 14 constituting the image guide (FIG. 5(C)), and the circle A indicated by a broken line corresponds to the second cladding tube 16 constituting the image guide (FIG. 5(C)). The circle indicating the image guide optical axis image ■1 is this circle A.
is the inscribed circle of

In this case, when the parallel flat glass G forming a predetermined angle θ is rotated about the longitudinal axis iLA (Fig. 4(B)),
Along with this, the image guide optical axis image 11 on the monitor 5
also rotates along circle B indicating its initial position (fourth
(■ to ■) in Figure (B).

In the case of the first embodiment (Fig. 2), the rotating ring 3J (Fig. 2 (Fig. 2)
B) In the case of the second embodiment (FIG. 3), the first rotating ring 3P is rotated.

When the parallel flat glass G is rotated in this way, the center 01 of the image guide optical axis image 11 is aligned with the eyepiece optical axis image
It always intersects the Y axis of 2 (■ in Figure 4 (C)).

At this time, if the parallel flat glass G is tilted with respect to the transverse axis TA, the image guide optical axis image ■1 will move up and down, and in the case of Fig. 4(C), it will move upward from ■ and come to the position ■'. ), the image guide optical axis image ■1 can be superimposed on the eyepiece optical axis image I2, and thereby the optical axis OAl of the image guide 1A and the optical axis O of the eyepiece 2 can be superimposed.
A2 can be matched.

In the case of the first embodiment (Fig. 2), the rotating ring 3K (Fig. 2 (Fig. 2)
B) In the case of the second embodiment (FIG. 3), the second rotating ring 3Q is rotated.

In the embodiments described above (FIGS. 2 and 3), the transverse axis TA is located perpendicularly to the drawing, and the parallel flat glass G is tilted around the horizontal axis.

However, the transverse axis TA may also lie parallel to the drawing, and the parallel flat glass G may be tilted about the vertical axis.

In this case, after rotating the image guide optical axis image 11 displayed on the monitor 5 along the circle B (Fig. 4 (B))
, the center 01 of the optical axis image ■1 is Y of the eyepiece optical axis image I2
The image guide optical axis image 11 is stopped at a position intersecting the axis, and then moved left and right to overlap with the center 02 of the eyepiece optical axis image I2.

[■] Effects of the Invention As described above, according to the present invention, the eyepiece 2 is installed between the optical system of the eyepiece 2 and the television camera 4 at a predetermined angle θ, and is rotatable about the longitudinal axis LA. Parallel flat glass G tiltable with respect to the transverse axis TA
By operating the optical axis adjustment mechanism 3 while viewing the screen of the monitor 5, the optical axis OAI of the image guide 1 and A and the optical axis OA of the eyepiece 2 can be adjusted.
Technical measures were taken to bring the numbers into line.

According to this configuration, the optical axis adjustment mechanism 3 is installed between the optical system and the television camera 4, that is, at the rear of the optical system.

Moreover, this optical axis adjustment mechanism 3 is not a mechanical means of moving the image guide itself as in the past, but an optical method of changing the optical path of the optical axis OAI of the image guide 1A via the parallel flat glass G. This is an optical means that utilizes the refraction effect of

Therefore, unlike in the past, the optical axis adjustment mechanism 3 is not limited to the image guide and its tightening is limited to the space occupied by the image guide, and there is sufficient space between the optical system and the television camera 4. Now it can be installed.

In addition, the image guide optical axis image 1 after passing through the optical system
1 is rotated and moved vertically or horizontally on the monitor 5 by rotating and tilting the parallel flat glass G constituting the optical axis adjustment mechanism 3.

Therefore, there is no big difference between the range in which the parallel flat glass G moves and the range in which the image guide optical axis image 11 on the monitor 5 moves, and the image guide optical axis image disappears from the monitor screen as in the conventional case. Nothing happens.

Therefore, when operating the optical axis adjustment mechanism 3 while viewing the image guide optical axis image (1) and the eyepiece optical axis image (I2) displayed on the monitor 5, the operability has been significantly improved.

Therefore, according to the present invention, the optical axis adjustment mechanism of the vascular endoscopic catheter can be installed with sufficient space, and the technical effects of improving the operability of the optical axis adjustment mechanism can be achieved.

[Brief explanation of drawings]

FIG. 1 is an overall view showing an embodiment of the present invention, FIG. 2 is a diagram showing a first embodiment of the present invention, FIG. 3 is a diagram showing a second embodiment of the present invention, and FIG. 4 is a diagram showing a second embodiment of the present invention. FIG. 5 is an explanatory diagram of the prior art. ■... Catheter for vascular endoscopy, 2... Eyepiece, 3... Optical axis adjustment mechanism, 4... Television camera, 5... Monitor, 1A... Image guide, OAI, OA2...・Optical axis, I1, I2...Optical axis image, L...Optical system, G...Parallel flat glass, θ...Installation angle of parallel flat glass, LA...Longitudinal axis line, TA・...horizontal axis.

Claims (6)

[Claims] (1) The image guide 1A constituting the endovascular catheter 1 is installed at a predetermined angle θ between the optical system L of the eyepiece 2 into which it is inserted and the television camera 4, and is rotated about the longitudinal axis LA. An optical axis adjustment mechanism 3 including a parallel flat glass G that is tiltable with respect to the transverse axis TA is provided to adjust the optical axis image I1 of the image guide 1A.
and the optical axis image I2 of the eyepiece 2 are displayed on the monitor 5 via the television camera 4, and the optical axis image I2 of the eyepiece 2 displayed on the monitor 5 is displayed by operating the optical axis adjustment mechanism 3.
An optical axis of a vascular endoscopic catheter characterized in that the optical axis OA1 of the image guide 1A and the optical axis OA2 of the eyepiece 2 are made to coincide with each other by superimposing the optical axis image I1 of the image guide 1A on the Adjustment method. (2) The optical axis of the vascular endoscopic catheter according to claim 1, wherein the optical axis adjustment mechanism 3 comprises a rotating holder 3A that holds the parallel flat glass G, and an inclined holder 3B that accommodates the rotating holder 3A. Adjustment method. (3) The rotary holder 3A is rotatable by a knob 3A1 passing through the inclined holder 3B, and the inclined holder 3
3. The optical axis adjustment method for a vascular endoscopic catheter according to claim 2, wherein B is tiltable by a gear 3D and a pressing bar 3G. (4) The above knob 3A1 is the base tube 2A of the eyepiece 2.
The gear 3D is fixed to a rotating ring 3J provided on the outer surface of the base cylinder 2A, and the gear 3D is fixed to a rotating ring 3J provided on the outer surface of the base cylinder 2A.
4. The optical axis adjustment method for a catheter for vascular endoscopy according to claim 3, wherein the catheter is screwed into K. (5) The optical axis adjustment mechanism 3 includes a holder 3R that holds the parallel flat glass G, a second rotating ring 3Q that is threadedly engaged with the holder 3R, and a second rotating ring 3Q that is loosely fitted with the second rotating ring 3Q. 2. The optical axis adjustment method for a catheter for vascular endoscopic vision according to claim 1, comprising a one-rotation ring 3P. (6) The optical axis adjustment method for a vascular endoscopic catheter according to claim 5, wherein the second rotating ring 3Q is rotatable together with the first rotating ring 3P, and is also rotatable independently.