JPS6351686B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intrabody cavity diagnostic device such as an endoscope,
In particular, the present invention relates to an intrabody cavity diagnostic device that has an improved watertight structure in the penetrating portion of an operating body that can be operated from the outside.

In general, an endoscope performs various operations in an operating section, and in each case, a mechanism within the operating section is operated from the outside via an operating shaft that passes through a casing. If the structure is such that the operating shaft passes through the casing, it is generally difficult to make it watertight. However, recently, while improving the durability of endoscopes, it has been desired to clean and disinfect the entire endoscope.

Therefore, a method of inserting an O-ring into the gap between the through hole of the casing and the operating shaft was devised. However, with this method, if the operating shaft is even slightly eccentric with respect to the through hole in the casing, the crushing margin of the O-ring will be offset, making it difficult to rotate the operating shaft and reducing its watertight performance. There are drawbacks such as insufficient water leakage and O-ring damage in a short period of time.

Another method has been considered in which a flexible tube is fitted onto the operating shaft, one end of which is watertightly fixed to the operating shaft, and the other end is watertightly fixed to the casing side. However, there were problems in that the range of rotation of the operating shaft was limited to the range in which the flexible tube could be twisted, that the operation became difficult, or that the tube could break.

Furthermore, in the method using this tube, a rotation ring is fixed to the other end of the tube,
It has also been considered to allow this rotating ring to rotate in a watertight manner relative to the casing. However, even in this method, the watertight structure is complicated and there is considerable operational resistance, and the tube itself still twists, so the above-mentioned disadvantages such as poor durability cannot be solved.

The present invention has been made focusing on the above circumstances,
The purpose is to provide an intrabody cavity diagnostic device that can reduce the amount of force required to operate the operating shaft from outside the watertight casing, and improve its sealing performance and durability without limiting the operating range. .

Hereinafter, each embodiment of the present invention will be described based on the drawings.

First, a first embodiment will be described based on FIGS. 1 and 2.

In this first embodiment, an endoscope is used as a body cavity diagnostic device, and 1 in FIG. 1 indicates the endoscope. This endoscope 1 consists of an operating section 2 and an insertion section 3. The insertion section 3 is formed by connecting a distal end portion 6 to the distal end of a flexible tube 4 via a curved tube 5, and the curved tube 5 arranges a plurality of curved nodes 7 in its axial direction, and The objects are rotatably attached to each other and can be bent both upward and downward. A pair of operating wires 8, 8 are inserted into the insertion portion 3 so as to be freely advanced and retracted. 8,
The bending tube 5 can be bent up and down by introducing the proximal end of the tube 8 into the operating section 2 and alternately pushing and pulling it using a bending operation mechanism 9, which will be described later. In addition, as shown in FIG.
and a back cover 13, both covers 12,
A substrate 14 serving as a base body is inserted between the substrates 13 . Furthermore, for each cover 12, 13, the substrate 14 has a sealing sheet 15 on both sides, respectively.
16, and are fastened and fixed by tightening screws 17 and nuts 18.

On the other hand, the bending operation mechanism 9 is incorporated into the watertight casing 11. This bending operation mechanism 9 is constructed as follows. That is, a rotary bearing 19 is attached and fixed to the substrate 14, and the base end of the rotary shaft 21 of the wire hoisting drum 20 is rotatably inserted into the rotary bearing 19, and the other end of the rotary shaft 21 is exposed. It protrudes to the outside through a through hole 22 formed in the cover 12. A bending operation knob 23 is attached to the end of the rotating shaft 21 that projects outside, so that the wire winding drum 20 can be rotated together with the rotating shaft 22. In addition, the through hole 22 and the rotating shaft 2
1, an O-ring 24 for sealing is inserted. Also, the rotating shaft 2 inserted into the rotating bearing 19
The end portion 1 is formed to have a larger diameter than the other portions, and this large diameter portion 25 is fitted into the rotary bearing 19, and the stepped end face is held down by a nut 26 to prevent it from coming off. The operating wires 8, 8 are attached to the wire hoisting drum 20 so that the base end sides thereof are respectively wound from the reflective side, and by rotating the wire hoisting drum 20, the operating wires 8, 8 are alternately pushed. It is now possible to pull it. Furthermore, a gear 27 is coaxially attached and fixed to the rotating shaft 21. This gear 27 is connected to a brake mechanism 28 installed on the side of this bending operation mechanism 9.

The brake mechanism 28 is constructed as follows. That is, a guide shaft 29 is attached and fixed to the base plate 14, and a brake gear 30, a friction plate 31, a disc spring 32, an axial rotary plate 33, and a rotation transmission member 34 are sequentially mounted on this guide shaft 29 toward its distal end. They are fitted together coaxially.

The brake gear 30 is the large diameter portion 2 of the guide shaft 29.
9a, and its gear portion 30a is engaged with the gear 27 of the bending operation mechanism 9. In other words, when the gear 27 on the bending operation mechanism 9 side rotates, this brake gear 30 also rotates in conjunction.

The friction plate 31 has a friction member 31a and a back plate 31b.
The friction member 31a is brought into pressure contact with the bottom surface of a recess 30b formed in the brake gear 30. Furthermore, back plate 3
1b has a rectangular square hole 35 in its center, and this square hole 35 is fitted into a corner 36 with a square cross section formed in the guide shaft 29, and is attached so that it can move in the axial direction as a whole but cannot rotate. be. In other words, the friction plate 31 moves only in the axial direction along the guide shaft 29 and cannot rotate.

The axial rotating plate 33 has a female threaded portion 37 at its center.
This female threaded portion 37 is screwed into a male threaded portion 38 formed to correspond to the guide shaft 29. By rotating, it moves in the axial direction of the guide shaft 29.

Note that the disc spring 32 has a friction plate 31 and an axial rotation plate 3.
It is interposed between 3.

The rotation transmission member 34 is rotatably fitted to the guide shaft 29, and the watertight casing 11
A shaft portion 40 is provided that protrudes to the outside through a through hole 39 formed in the wall portion of the front cover 12 that constitutes the front cover 12 . A brake operation lever 41 is attached to the protruding outer end of this shaft portion 40, so that the rotation transmission member 34 can be rotated externally. Further, the rotation transmission member 34 is provided with a pin 42 that projects toward the axial rotation plate 33 side. Further, facing the pin 42, an engagement hole 4 into which the pin 42 is loosely inserted is provided in the axial rotating plate 33.
3 is provided. The length of the pin 42 is always in charge of the coordination hole in the total range where the axial rotation plate 33 can be moved.
It is set to keep inserting to 3. In other words, the rotation of the rotation transmission member 34 is transmitted to the axial rotation plate 33 via the pin 42, so that the axial rotation plate 33 can be moved in the axial direction. and,
In this case, the axial rotation plate 33 is connected to the rotation transmission member 3.
They are set so that they do not come into contact with each other even when they are closest to the 4th side. In other words, there is a gap S ₁ between them for absorbing the assembly position error in the axial direction.
is beginning to form. At this time, the axial rotary plate 33 refers to the first operating member in the claims, and the rotation transmission member 34 refers to the second operating member. On the other hand, the rotation transmission member 3
4 and the inner surface of the watertight casing 11, an O-ring 44 as an elastic sealing member is inserted in an axially compressed state. A portion of this O-ring 44 is fitted into a groove 45 formed on the rotation transmission member 34 side, and is coaxially attached to the rotation transmission member 34. However, watertight casing 11
The inside and outside of the building are watertightly separated. Note that an annular sealing sheet 46 is inserted between the brake operating lever 41 and the outer surface of the watertight casing 11.

Further, the shaft portion 40 of the rotation transmitting member 34 passes through the through hole 39, and the diameter of the through hole 39 is larger than that of the shaft portion 40, so that the watertight casing 11 and the rotation transmitting member 34 can be connected to each other. In between, a gap _S2 for absorbing assembly position error in the radial direction is formed.

On the other hand, the rotary bearing 19 and the guide shaft 29 are provided with positioning protrusions 19a and 29a on their base end surfaces, and these are inserted into the positioning hole 4 formed in the substrate 14.
7 and 48 respectively, and are positioned at correct relative positions and fixed by set screws 49. In addition, the front cover 12 and the back cover 13 are attached to the sealing sheet 1 as described above.
5, 16 and the tightening screw 17 via the board 14.
is tightened and fixed by a nut 18, but the insertion hole 14a through which the tightening screw 17 is inserted is
Since the tightening screw 17 is formed larger than the outer diameter to provide a margin, the overlapping position of the front cover 12 and the substrate 14 can be shifted. Therefore, the rotating shaft 21 can be accurately aligned with the through hole 22 of the front cover 12.

The bending operation mechanism 9 is provided with a stopper (not shown) for regulating the amount of rotation of the wire hoisting drum 20. Further, the brake mechanism 28 is also provided with a stopper (not shown) for regulating the amount of rotation of the axial rotary plate 33.

Next, the operation of the endoscope 1 of this embodiment will be explained. First, when performing an operation of bending the bending tube 5 of the insertion section 3 to change the direction of the tip end 6, the brake operating lever 41 is rotated to the free side.
That is, the axial rotary plate 33 is rotated so that the axial rotary plate 33 is moved in a direction in which it is retracted from the friction plate 31 . This rotation is transmitted via the rotation transmission member 34 and the pin 42. As the axial rotary plate 33 retracts, the disc spring 32 also retracts, and the friction plate 31 is not pressed against the brake gear 30, so no friction force is generated therebetween. Therefore, the brake gear 30 can freely rotate around the guide shaft 29 while being engaged with the gear 27 of the bending operation mechanism 9. In other words, the brakes are not applied.

Therefore, when the bending operation knob 23 of the bending operation mechanism 9 is turned in one direction, the wire winding drum 20 rotates to wind in one operating wire 8 and let out the other operating wire 8. Therefore, the bending tube 5 can be bent toward the pulled operation wire 8 side. As mentioned above, this operation does not involve applying the brakes, so it can be performed with light force.

On the other hand, when the brake operating lever 41 is turned to the opposite side, the axial rotary plate 33 moves toward the friction plate 31 and presses the friction plate 31 against the brake gear 30 via the disc spring 32. Therefore, a frictional force is generated between the brake gear 30 and the friction plate 31, and since the friction plate 31 is originally unable to rotate, the brake gear 30 is also fixed. That is, the gear 27 that engages with the brake gear 30 is fixed, and a brake is applied to the bending operation of the bending operation mechanism 9. Therefore, the curved tube 5 can be fixed in its curved state. Further, by strongly turning the bending operation knob 23 while the brake is applied, fine bending operation can be performed.

On the other hand, in the configuration of the above embodiment, the front cover 1
2. When assembling the back cover 13, substrate 14, bending operation mechanism 9, and brake mechanism 28, pay attention to the following points. That is, when positioning the front cover 12 with respect to the substrate 14, the rotating shaft 21 of the bending operation mechanism 9 is accurately aligned with the through hole 22 of the front cover 12, and the front cover 12 is attached and fixed.
However, for this reason, the rotation transmission member 34 (second operating member) of the brake mechanism 28 and the through hole 39 are eccentric due to machining errors. However, since the gap _S2 for absorbing the radial assembly position error exists, the rotation transmission member 34 does not come into contact with the inner wall of the through hole 39. Therefore, the front cover 1 is attached to the substrate 14.
2, there is no problem even if the position of the through hole 39 is out of alignment with respect to the guide shaft 29.

Further, although the rotation transmission member 34 is positioned with respect to the front cover 12, a gap _S1 is provided between the rotation transmission member 34 and the axial rotation plate 33 for absorbing assembly errors in the axial direction. Therefore, even if the distance between the substrate 14 and the front cover 12 is incorrect during processing or assembly, as shown by l in FIG. I don't feel any force. Of course, even if there is misalignment, there is no effect on the O-ring 44. Therefore, the sealing performance of the O-ring 44 does not deteriorate and the durability of the O-ring 44 does not deteriorate, and the brake operating lever 41 can be operated with a light operating force.

Further, the rotation transmission member 34 is fitted onto a guide shaft 29 rigidly fixed to the base plate 14, and a gap is provided between the rotation transmission member 34 and the front cover 12 for absorbing assembly position errors in the radial direction. Since _S2 is provided, even if a strong force in the radial direction is applied to the rotation transmission member 34, no burden is placed on the front cover 12, etc. Therefore, the front cover 12 can be made of any material such as synthetic resin.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 to 5.

This second embodiment is applied to a treatment tool raising operation mechanism 62 of an endoscope 61. As shown in FIG. 3, the endoscope 61 has an operating section 63 connected to an insertion section 64, and a channel 66 through which a treatment instrument 65 is inserted is formed inside the endoscope 61. channel 6
6 is open at the distal end of the insertion portion 64. A treatment instrument 65 is provided within this opening 66a.
An inductor 67 is pivotally mounted to regulate the direction of the lead-out direction. The tip of an operating wire 68 guided to the operating section 63 side through the insertion section 64 is connected to the distal end of the inductor 67. By pulling the operating wire 68, the inductor 67 is appropriately rotated to raise the treatment instrument 65.

The treatment instrument raising operation mechanism 62 is incorporated into the operation section 63 as shown in FIG. The main body of the operating section 63 is formed by fitting a base plate 70 as a base into the opening of a watertight casing 69 to form a case body 71. Inside the case body 71, a guide shaft is provided on the inner surface of the base plate 70. 72 is fixed. A pinion 73 is rotatably attached to this guide shaft 72. The pinion 73 is adapted to engage a rack 74 for operating the operating wire 68 to advance the rack 74. The rack 74 is fitted into and guided by a cylinder 75 fixedly attached to the base plate 70. Pinion 73 engages rack 74 through a window 76 formed in cylinder 75. The watertight casing 69 is provided with a through hole 77, and a rotation transmitting member 78 is rotatably inserted through the through hole 77, facing the guide shaft 72. The guide shaft 72 and the rotation transmission member 78 are arranged substantially coaxially. Further, between the rotation transmission member 78 and the inner periphery of the through hole 77, an O-ring 7 as an elastic sealing member is provided coaxially therewith.
9 is installed. An operating lever 80 is attached and fixed to the outer end of the rotation transmission member 78. Further, the rotation transmitting member 78 includes the pinion 7.
A pair of engagement legs 81, 81 protruding from the side of the pinion 73 are provided.
2, 82 and engages with each other. The above engagement groove 8
2, 82 are formed long along the radial direction, and the engagement legs 8 are formed along the engagement grooves 82, 82.
1,81 can be moved. In other words, the rotation transmission member 78 is disposed in the radial direction of the guide shaft 72.
A gap _S3 for absorbing radial assembly position errors is formed to absorb positional deviations between the two. Note that the first operating body in the claims herein refers to the pinion 73, and the second operating body refers to the rotation transmission member 78. Furthermore, the tips of the engagement legs 81, 81 and the bottom surfaces of the engagement grooves 82, 82 do not come into contact with each other;
There is a gap between this to absorb the assembly position error in the axial direction.
Forming S ₄ . Further, as shown in FIG. 4, the flange portion 83 of the rotation transmission member 78 contacts the inner surface of the watertight casing 69, while a seat 84 is inserted between the operating lever 81 and the outer surface of the watertight casing 69 on the outer end side. and the rotation transmission member 78
The axial mounting position is determined by the watertight casing. Further, the mounting position in the radial direction is determined by the through hole 77.

The watertight casing 69 and the substrate 70 are each made of synthetic resin, for example, and an engagement recess 85 is formed at the periphery of the opening of the watertight casing 69, and the engagement recess 85 is elastically deformed at the periphery of the substrate 70. It is designed to be used and fitted. Therefore,
The positional relationship between the two is uniquely determined. Note that an elastic packing 86 is interposed between the engagement parts.

Next, the operation of the endoscope 61 of this embodiment will be explained. When raising the treatment instrument 65 inserted into the channel 66, the operating lever 80 is rotated. That is, when the operation lever 80 is rotated, the rotation transmission member 78 is rotated together with the rotation, and the engagement grooves 82, 8 are rotated.
By rotating the pinion 73 via the engaging foot 81 that engages the rack 74, the rack 74 moves and pulls the operating wire 68. As a result, the inductor 67
can be raised to raise the treatment instrument 65. Furthermore, by changing the amount and direction of rotation of the operating lever 80, the operating wire 68 can be moved forward and backward to lower and raise the treatment instrument 65.

On the other hand, as described above, the guide shaft 72 is attached and fixed to the base plate 70, and the rotation transmission member 78 as the second operating member is positioned in the watertight casing 69. However, between the pinion 73 as the first operating member and the rotation transmission member 78, there is a gap S ₃ for absorbing assembly position errors in the radial direction and a gap S ₄ for absorbing assembly position errors in the axial direction. Since they are provided respectively, even if a positional shift occurs between the guide shaft 72 and the rotation transmitting member 78, this can be absorbed. Therefore, the O-ring 79 is not subjected to uneven compression or unnecessarily strong compression, so that its sealing performance and durability can be ensured. Furthermore, the rotation transmission member 78 and, in turn, the operation lever 80 can be operated easily. Furthermore, the watertight casing 69 and the substrate 7 in this embodiment
0 means that even if a simple and inexpensive method of fitting by elastic deformation is adopted, there will be no problem since assembly errors can be absorbed as described above.

Next, a third embodiment of the present invention will be described with reference to FIGS. 6 to 8. This embodiment shows an endoscope 91 equipped with a so-called focusing mechanism. The operating section 92 of this endoscope 91 is constructed as shown in FIG. 6, and the vicinity of the distal end of the insertion section 93 is constructed as shown in FIG. An observation window 95 and an illumination window 96 are provided on the distal end surface 94 of the insertion portion 93, and an objective lens 98 attached to a lens frame 97 that is movable in the optical axis direction is installed inside the observation window 95. The objective lens 98 focuses an observation light image on the distal end surface of the image guide 99 by adjusting the position of the lens frame 97.
The image guide 99 is guided through the insertion section 93 to the eyepiece section 100 of the operating section 92. Further, the tips of the light guides 101 are installed opposite to each other inside the illumination window 96, and the light guides 101
1 is guided to the operating section 92 side through the insertion section 93 so that it can be connected to a light source device (not shown).

On the other hand, the lens frame 97 can be moved back and forth by a focus adjustment operation mechanism 103 built into the operation section 92 via an operation wire 102 inserted into the insertion section 93.

The focus adjustment operation mechanism 103 is constructed as shown in FIG. That is, a guide shaft 105 is fixedly provided on the base body 104 that constitutes the main body of the operating section 92. A helicoid tube 106 is rotatably fitted onto the outer periphery of the guide shaft 105. Further, the helicoid tube 106 is surrounded by a guide tube 107 arranged concentrically. The guide tube 107 is attached and fixed to the base body 104 by screws 108. Furthermore, a guide groove 109 formed along the axial direction of the helicoid tube 106 is formed on the inner surface of the guide tube 107, and the helicoid tube 10 is inserted into the guide groove 109.
A helicoid piece 111 that engages with the helicoid screw 110 of No. 6 is fitted. Thus, by rotating the helicoid tube 106, the helicoid piece 111 can be moved in the axial direction according to the rotation direction. Then, the operation wire 102
is connected to the helicoid piece 111, so that the operating wire 102 can be pushed or pulled.

In addition, a base body 104 that constitutes the main body of the operation unit 92
is covered by a watertight casing 112.
The watertight casing 112 accommodates members such as the guide shaft 105. Further, a through hole 113 is formed in the wall of the watertight casing 112 corresponding to the guide shaft 105, and an operating shaft 114 as a second operating member is inserted into this through hole 113 and is pivotally supported. . The operating shaft 114 passes through the watertight casing 112, and an O-ring 115 as an elastic sealing member is coaxially inserted between the operating shaft 114 and the inner surface of the through hole 113. A focusing knob 116 is attached to the outer end of the operating shaft 114. Further, the inner end of the operating shaft 114 enters into the helicoid cylinder 106, and its tip surface contacts the tip surface of the guide shaft 105 via an elastic sheet plate 117. Further, protrusions 118, 118 are provided on the outer periphery of the inner end portion to protrude in the radial direction. The protrusions 118, 118 are adapted to fit into and engage with engagement grooves 119, 119 formed on the inner surface of the helicoid cylinder 106. In addition, each protrusion 118, 11
8 is in contact with the inner surface in the axial direction of the end edge 106a of the helicoid tube 106. In other words, the operation shaft 114 is positioned in the axial direction because its protrusions 118, 118 contact the axial inner surface of the end edge 106a, and also contact the tip end surface of the guide shaft 105 via the elastic sheet plate 117. will be done. Therefore,
The axial assembly positional relationship between the watertight casing 112 and the operating shaft 114 is arbitrary. This can be considered to mean that a gap is substantially formed between the watertight casing 112 and the operating shaft 114 for absorbing assembly position errors in the axial direction. on the other hand,
There is a gap between the tips of the protrusions 118, 118 and the inner bottom surface of the engagement groove 119, which forms a gap _S5 for absorbing assembly position errors in the radial direction.

Therefore, when performing focusing in the endoscope 91 of this embodiment, while observing through the eyepiece 100, the focusing knob 116 is
By turning the lens, the objective lens 98 is moved in the optical axis direction and focused. That is, when the focusing knob 116 is turned, the rotation causes the projections 118, 118 and the engagement grooves 119, 11
9 to the helicoid cylinder 106. When the helicoid cylinder 106 rotates, the helicoid piece 111 that engages with it moves in the axial direction along the guide groove 109, thereby moving the operating wire 102. Thus, the objective lens 98 can be adjusted by moving the lens frame 97 connected to the operating wire 102.

On the other hand, in this embodiment, the helicoid cylinder 10
6 and the operation shaft 114, there is a gap S ₅ for absorbing the radial assembly position error, and the operation shaft 114
and the watertight casing 112, there is a gap for absorbing assembly position errors in the axial direction. Therefore, in this embodiment as well, there is no problem even if there is an assembly position error in each direction as in the above embodiment.

Note that the present invention is not limited to what is shown in the above embodiments, and can be applied to various other cases. For example, it can be applied to a wire winding drum, sprocket, or bevel gear as the first operating member, and its functions include a diopter adjustment mechanism of an endoscope eyepiece, a film winding mechanism, etc. Applicable.

As explained above, the operating body of the present invention is divided into a first operating member and a second operating member, and the first operating member is rotatably engaged with a guide shaft fixed to the base side, The second operation member penetrates the watertight casing and maintains a watertight relationship with the watertight casing by an elastic seal member provided coaxially, and when rotated from outside the watertight casing, the second operation member engaged with the operating member so as to transmit its rotational force, and further provided between the watertight casing and the second operating member and at least one of the first operating member and the second operating member. A gap for absorbing an assembly position error is provided in at least one of the axial direction and the radial direction of the guide shaft.

Therefore, no eccentric force is applied to the elastic seal member coaxially attached to the operating body that penetrates the watertight casing, and no deviation occurs in the crushing margin. This prevents the operation from becoming heavy and allows easy operation.
Moreover, the watertight performance is not sufficient to cause water leakage, and the elastic sealing member is not damaged in a short period of time. Further, since the O-ring-shaped elastic seal member is used, which does not limit the rotational operation range of the operating body, a sufficient rotational operation range can be obtained. Furthermore, the structure of the watertight part can be simplified, and the reliability of sealing performance can be improved accordingly.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of an endoscope showing a first embodiment of the present invention, FIG. 2 is a sectional view of the operating section thereof, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a sectional side view of the endoscope, FIG. 4 is a sectional view of its operating section, FIG. 5 is a perspective view of its pinion, and FIG.
The figure is a cross-sectional view of the operating section of an endoscope showing a third embodiment of the present invention, FIG. 7 is a cross-sectional view taken along the line -- in FIG. 6, and FIG. FIG. 3 is a side sectional view of the vicinity of the tip. DESCRIPTION OF SYMBOLS 1... Endoscope, 19... Rotation bearing, 28... Brake mechanism, 29... Guide shaft, 33... Axial rotating plate, 34... Rotation transmission member, 61... Endoscope, 6
2... Treatment instrument raising operation mechanism, 69... Watertight casing, 72... Guide shaft, 73... Pinion, 78
...Rotation transmission member, 79...O ring, 81...
Engagement foot, 82...Engagement groove, 91...Endoscope, 10
3... Focus adjustment operation mechanism, 104... Base, 10
5... Guide shaft, 106... Helicoid tube, 107
...Guide cylinder, 112 ...Watertight casing, 11
3...Through hole, 114...Operation shaft, 118...Protrusion, 119...Engagement groove.

Claims (1)

[Scope of Claims] 1. A base covered by a watertight casing, a guide shaft fixed to the base and installed in the watertight casing, and a guide shaft rotatably provided around the guide shaft and penetrating the watertight casing. a ring-shaped elastic sealing member that is coaxially attached to the operating body and seals between the watertight casing, and the operating body has a first operating member and a second operating member. The first operating member is rotatably engaged with the guide shaft, and the second operating member penetrates the watertight casing and is connected to the watertight casing by the elastic seal member. is held watertight, and when rotated from outside the watertight casing, engages with the first operating member so as to transmit its rotational force, while between the watertight casing and the second operating member. , and at least one of the first operating member and the second operating member is provided with a gap for absorbing an assembly position error in at least one of the axial direction and the radial direction of the guide shaft. An intrabody cavity diagnostic device characterized by: 2. In the intrabody cavity diagnostic device according to claim 1, the elastic seal member is compressed in the axial direction of the guide shaft, and there is a gap between the first operating member and the second operating member. An intrabody cavity diagnostic device characterized in that a gap for absorbing the assembly position error is formed in the axial direction of the guide shaft. 3. In the body cavity diagnostic device according to claim 2, the second operating member is fitted to the guide shaft, and the guide shaft is radially assembled to the watertight casing at the penetrating portion. An intrabody cavity diagnostic device characterized by forming a gap for absorbing positional errors. 4. In the intrabody cavity diagnostic device according to claim 3, the first operating member is guided by the guide shaft and is engaged so as to be able to perform rotational and axial movement. Characteristics of the body cavity diagnostic device. 5. In claim 1, the elastic seal member is compressed in the radial direction of the guide shaft, and the first operating member and the second operating member are compressed in the radial direction of the guide shaft at the assembly position. An intrabody cavity diagnostic device characterized by forming a gap for absorbing errors.