JPH06292652A - Endoscope - Google Patents

Abstract

(57) [Summary] [Object] To provide a scope and an endoscope which can be easily inserted into a meandering body cavity such as a sigmoid colon, a spleen flexion and the like. A guiding hollow tube 21 provided in a scope and an endoscope of the present invention includes a spiral tube 22 as a second hollow member formed of a shape memory alloy inside a spiral tube 11 as a first hollow member. So that the outer diameter of the spiral tube 22 is substantially larger than the inner diameter of the spiral tube 11 in a predetermined temperature range, and is substantially the same as the above-mentioned inner diameter outside the predetermined temperature range. Has been formed. In other words, the spiral tube 22 remembers a shape whose outer diameter is larger than the inner diameter of the spiral tube 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope such as an electronic endoscope and a fiberscope, and more particularly to an electronic endoscope including a large intestine scope.

[0002]

2. Description of the Related Art An endoscope is capable of observing the inside of a body cavity of a patient, for example, the inside of the body cavity located near the distal end of the scope by inserting the scope into the digestive tract, large intestine or the like.

FIG. 11 is an overall perspective view showing an electronic endoscope.

As shown in FIG. 1, the electronic endoscope 1 includes a scope 2, a main body 3 and a monitor 4, and
Is for inserting a tip portion called a rigid portion 5 provided with a solid-state image sensor, a cleaning nozzle, etc., a curved portion 6 for orienting the rigid portion 5 in a desired direction, and inserting the rigid portion 5 to a desired position in a body cavity. An intermediate portion called a guide tube 7 and an operating portion 8 for performing various operations are sequentially connected.

The guiding hollow tube 7 is, as shown in FIG. 12, a metal spiral tube 11, a mesh metal blade 12 and a rubber outer skin 1.
It is formed of a hollow structure in which 3 is laminated.

Here, the outer skin 13 and the blade 12 are fixed to each other with an adhesive or the like, but the blade 12 and the spiral tube 11 are formed so as to be slidable with respect to each other, and when the guiding tube 21 is bent. The guiding hollow tube 21 is designed to flex freely.

In the hollow portion formed in the spiral tube 11,
An optical fiber for illumination, an electric cable, an air / water supply tube, etc., which are not shown, are passed through. The bending hardness of the guiding tube 7 is set to a predetermined hardness at the time of manufacture by adjusting the flex pitch of the spiral tube 11, the thickness of the outer cover 13, the rubber hardness, etc. 30 to 40c
It is formed softer up to m and harder on the rear side.

In order to display a diseased part in a body cavity, for example, the large intestine on the monitor using the electronic endoscope 1, the guiding tube 7 is gradually inserted into the large intestine while holding the operating part 8 by hand, and the rigid part 5
Is sent to the desired affected part position. Next, the TV of the rigid part 5
The inside of the body cavity is imaged with a camera. The imaged image of the inside of the body cavity is sent to the main body 3 via the universal cord 9, is appropriately subjected to image processing in the main body 3, and then is displayed on the monitor 4.

[0009]

Here, even if the scope 2 is inserted and passed through the sigmoid colon and then the scope 2 is straightened in preparation for insertion into the spleen flexion, the guiding central tube 7 is There is a problem that it is difficult to linearize the scope because it is bent.

Further, after straightening, even if the distal end of the scope 2 is inserted into the transverse colon through the spleen bending portion, the guiding central tube 7
May bend in the middle and the insertion force may not be transmitted to the tip of the scope. Even if an attempt is made to insert the tube further in such a situation, the guiding hollow tube 7 only loops in the middle, rather causing pain to the patient.

In order to avoid the inability to insert due to the bending of the guiding hollow tube 7, conventionally, a hollow sliding tube is used to insert the scope 2 while preventing the bending of the guiding hollow tube 7 so that the spleen bending portion is inserted. I was supposed to insert the scope 2 in the back.

However, in the method using the sliding tube, the intestinal wall may be sandwiched between the sliding tube and the scope 2, or the intestinal wall may be damaged to cause bleeding, which may cause great pain to the patient.

For this reason, it is necessary to perform a highly difficult procedure such as carefully inserting the scope 2 while performing X-ray fluoroscopy, and it takes a very long time just to insert the scope 2.

The present invention has been made in consideration of the above-mentioned circumstances, and an object thereof is to provide a scope and an endoscope which can be easily inserted into a meandering body cavity such as the sigmoid colon, the spleen flexion and the like. To do.

[0015]

In order to achieve the above object, the endoscope of the present invention has an observation means capable of observing the inside of a body cavity of a subject as described in claim 1 as desired. In an endoscope including a guiding hollow tube that can be inserted to a position, the guiding hollow tube is provided inside a first hollow member and the first hollow member, and is stored in advance in a predetermined temperature range. A second hollow member formed of a shape memory alloy that attempts to return to a predetermined shape, and temperature control means for changing the temperature of the second hollow member, wherein the second hollow member has an outer diameter Memorizes a shape larger than the inner diameter of the first hollow member.

Further, as described in claim 6, the endoscope of the present invention comprises a guiding tube capable of inserting an observation means capable of observing the inside of the body cavity of the subject to a desired position in the body cavity. In the endoscope, the guiding hollow tube is provided with a first hollow member, and a shape memory alloy that is provided inside the first hollow member and that tries to return to a pre-stored shape in a predetermined temperature range. A second hollow member formed by, a temperature control means for changing the temperature of the second hollow member in a predetermined segment unit, and a display means for displaying a control state of the temperature control means. The second hollow member has a shape in which the outer diameter is larger than the inner diameter of the first hollow member.

Further, as described in claim 7, the endoscope of the present invention comprises a guiding tube capable of inserting observation means capable of observing the inside of the body cavity of the subject to a desired position in the body cavity. In the endoscope, the guiding hollow tube is provided with a first hollow member, and a shape memory alloy that is provided inside the first hollow member and that tries to return to a pre-stored shape in a predetermined temperature range. A second hollow member formed by the above, a detection means for detecting the insertion length of the guiding hollow tube into the subject, and a predetermined temperature based on a value detected by the detection means for the temperature of the second hollow member. The second hollow member stores a shape having an outer diameter larger than the inner diameter of the first hollow member.

[0018]

In the endoscope of the present invention, when the scope is inserted and passed through, for example, the sigmoid colon, the sigmoid colon is inserted near the distal end of the scope which is about to be inserted along the sigmoid colon. The bending rigidity of the guiding tube is reduced so that it can be easily inserted along the curve. On the other hand, for the portion that has already been inserted, the bending rigidity of the guiding tube is increased in a straightened state so that the insertion force can be easily transmitted to the tip.

Here, in order to increase the bending rigidity of the guiding hollow tube, the second hollow member is heated or cooled to a predetermined temperature range so that its outer diameter is larger than the inner diameter of the first hollow member, The second hollow member is pressed against the inner surface of the first hollow member. In such a state, the friction between the outer surface of the second hollow member and the inner surface of the first hollow member becomes large and becomes almost integral with bending, and the bending rigidity of the guiding hollow tube increases.

On the other hand, in order to reduce the bending rigidity of the guiding hollow tube, the second hollow member is cooled or heated so as to be out of a predetermined temperature range, and its outer diameter is almost equal to the inner diameter of the first hollow member. By making them the same, the friction between the second hollow member and the first hollow member is made substantially zero.

In this way, the scope is inserted while the bending rigidity of the distal end portion of the guiding tube is small and the bending rigidity of the front portion is high, and the scope is passed through the sigmoid colon.

Next, when the guide tube is completely exited from the sigmoid colon, the bending rigidity of the guide tube is increased over a predetermined section, for example, the entire section, while the guide tube is straightened. In this state, the guiding tube is easily inserted without bending in the middle.

Next, when the scope is further inserted and, for example, the spleen flexion between the descending colon and the transverse colon is to be passed therethrough, the guiding central tube corresponding to the portion passing through the spleen flexion is used. Only flexural rigidity is reduced. In such a state, the guiding central tube remains difficult to bend before the splenic flexure, but in the part along the flexure, the scope is easily bent along the splenic flexion, so that the scope extends along the splenic flexion. And easily inserted.

Next, the scope is inserted while sequentially shifting the region where the bending rigidity of the guiding tube is reduced from the vicinity of the tip toward the front.

[0025]

Embodiments of the endoscope of the present invention will be described below with reference to the accompanying drawings. Parts substantially the same as those in the prior art will be designated by the same reference numerals and description thereof will be omitted. To do.

The scope included in the electronic endoscope of the present embodiment is similar to that shown in FIG. 11 in that a rigid portion 5 provided with a solid-state imaging device, a cleaning nozzle, forceps, etc., and a curve for orienting the rigid portion 5 in a desired direction. A portion 6, a guiding tube 21 for inserting the rigid portion 5 to a desired position in a body cavity, and an operating portion 8 for performing various operations such as an angle operation are sequentially connected.

FIG. 1 is a partially cutaway perspective view of the guiding hollow tube 21 of this embodiment. As you can see in the figure,
The guiding hollow tube 21 is the metal spiral tube 1 as the first hollow member.
1, a spiral tube 22 as a second hollow member is further arranged inside the conventional guiding hollow tube 7 in which the mesh metal blade 12 and the rubber outer skin 13 are laminated.

The spiral tube 22 is substantially larger than the inner diameter of the spiral tube 11 in a predetermined temperature range, for example, in the range above 50 to 60 degrees Celsius, and in the range below 50 to 60 degrees Celsius. The inner diameter of 11 is substantially the same. In other words, the spiral tube 22 remembers a shape whose outer diameter is larger than the inner diameter of the spiral tube 11. When the shape memory alloy having the reverse transformation temperature Af and the transformation end temperature Mf is heated, the martensite phase (low temperature phase) changes to the austenite phase (high temperature phase) at the reverse transformation temperature Af, and the shape memory alloy Indicates a shape memory state, but conversely, when cooled, the austenite phase (high temperature phase) changes from the austenite phase (high temperature phase) to the martensite phase (low temperature phase) at the transformation end temperature Mf and returns to the original size. Here, the spiral tube 22 is made of, for example, Ni-Ti.
In the case of forming a shape memory alloy made of an alloy, if the Ni concentration is 48 to 50% by weight, it becomes possible to set the above transformation temperature.

The spiral tube 11 and the spiral tube 22 are the guiding tube 2
In order to easily twist 1 in any direction, it is preferable that the spiral directions are opposite to each other.

Inside the spiral tube 22, water cooling pipes 23a and 23b are arranged so that the spiral tube 22 can be cooled. The water cooling pipes 23a and 23b are preferably formed using a metal having a high thermal conductivity, such as copper.

FIG. 2 is a sectional view of the guiding hollow tube 21 in the axial direction.

FIG. 3 shows a cooling system diagram including the water cooling pipes 23a and 23b. As can be seen in the figure, the water cooling pipes 23a and 23b are respectively for the forward path,
The cooling water 32 for the return path, which is connected to each other near the tip of the guiding tube 21 and is sent from the container 31 built in the main body 3 via a predetermined pump, is for the water cooling for the outward path. After being sent from the operation section 8 side of the guiding hollow tube 21 to the bending section 6 side through the pipe 23a, this time, the reverse path is followed through the water cooling pipe 23b for the return path and the container 31 in the main body 3 is reached. To return to.

The cooling water 32 is preferably used also as water to be sent to a water supply nozzle for cleaning a lens (not shown) attached to the tip of the scope. Further, the cooling water 32 is constantly sent to the water supply nozzle at a desired timing by operating the water supply valve 33, and to the water cooling pipe 23a by keeping the inside of the container 31 at a constant pressure higher than the atmospheric pressure. It is good to keep it.

The guiding hollow tube 21 is provided with temperature control means for changing the temperature of the spiral tube 22. The temperature control means can selectively energize the spiral tube 22 divided into predetermined segments for each segment, and the electric energy supplied by the energization is converted into Joule heat, whereby the spiral tube 2 is heated.
2 is heated for each segment. The segment length is preferably 10 cm, for example.

FIG. 4 shows a state in which the spiral tube 22 is divided, and as can be seen in the figure, the spiral tube 22 is S
..Sk-1, Sk, Sk + 1, ... Sn are divided into n segments, and lead wires are connected to each segment.

FIG. 5 is a block diagram showing an electric system relating to the spiral tube 22.

The main body 3 of the electronic endoscope of this embodiment includes an image processing section 41 capable of processing an image from a scope and outputting the image to the monitor 4, and a power source capable of energizing the spiral tube 22 for each segment Si. And an image processing unit 41.
Displays an identification indicating whether or not each segment is energized on the monitor 41 together with an image of the inside of the body cavity. A keyboard 43 is attached to the main body 3 so that a segment to be energized can be designated.

The spiral tube 22 is made of an electrically insulating heat-resistant resin or an electrically insulative ceramic so as to ensure electrical insulation from the spiral tube 21 and the conductors passing through the hollow portion and to withstand the temperature change sufficiently. It is better to coat.

Next, the operation of the electronic endoscope of this embodiment will be described.

When the scope is inserted and passed through the sigmoid colon, for example, the vicinity of the tip of the scope which is about to be inserted along the sigmoid colon is easily inserted along the curve of the sigmoid colon. First, the bending rigidity of the guiding hollow tube 21 is reduced. On the other hand, with respect to the already inserted portion, the bending rigidity of the guiding hollow tube 21 is increased in a straightened state so that the insertion force can be easily transmitted to the tip.

Here, in order to increase the bending rigidity of the guiding tube, the desired segments to be energized are designated using the keyboard 43, and those segments are energized by the power supply section 42. The electric energy of the energized segment is changed to Joule heat, and the spiral tube 22 at the segment position is heated.

When the spiral tube 22 is heated, the composition of the shape memory alloy, which is a constituent material of the spiral tube 22, changes from the martensite phase (low temperature phase) to the austenite phase (high temperature phase) at the boundary of the reverse transformation temperature Af, and the spiral tube 22 is heated. The outer diameter is substantially larger than the inner diameter of the spiral tube 11, that is, the shape memory state.

Then, the spiral tube 22 is pressed against the inner surface of the spiral tube 11, and the friction between the outer surface of the spiral tube 22 and the inner surface of the spiral tube 11 is increased, and as a result, the spiral tube 22 is rotated.
The bending rigidity increases as a result of being integrated with 1. Further, the change of the internal composition to the austenite phase (high temperature phase) also contributes to the increase of the bending rigidity.

On the other hand, in order to reduce the bending rigidity of the guiding hollow tube 21, the keyboard 43 is used to specify the segment to be deenergized, and the power source section 42 is deenergized to the designated segment.

Since the cooling water constantly circulates on the inner surface of the spiral tube 22, the spiral tube 22 is cooled at the segment position where the energization is interrupted.

When the spiral tube 22 is cooled, the composition of the shape memory alloy, which is the constituent material of the spiral tube 22, changes from the austenite phase (high temperature phase) to the martensite phase (low temperature phase) with the transformation end temperature Mf as a boundary, and The outer diameter of the spiral tube 11 returns to its original size under the stress of the spiral tube 11, that is, becomes substantially the same as the inner diameter of the spiral tube 11.

Then, the spiral tube 22 can freely slide and move with respect to the spiral tube 11, and the bending rigidity of the spiral tube 22 is reduced. Further, the change of the internal composition to the martensite phase also contributes to the reduction of the bending rigidity.

In this way, the scope is inserted while the bending rigidity of the distal end portion of the guiding hollow tube 21 is made small and the bending rigidity of the front portion is made high, and the scope is passed through.

Next, when the sigmoid colon is completely exited, the bending rigidity of the guiding hollow tube 21 is increased over the entire section in a state where the guiding hollow tube 21 is linearized. In this state, the guiding tube 21
Can be easily inserted without bending in the middle.

FIG. 6 (a) shows that the scope is inserted into the large intestine,
It shows a state in which the scope is linearized after passing through the sigmoid colon 51.

Next, when the scope is further inserted and the spleen flexion portion 54 between the descending colon 52 and the transverse colon 53 is to be passed therethrough, the guide corresponding to the portion passing through the spleen flexion portion 54 is introduced. Only the bending rigidity of the middle pipe 21 is reduced. In this state, the guiding central tube 21 remains difficult to bend in front of the splenic flexion portion 54, but in the portion along the splenic flexion portion 54, it is easy to flex along the splenic flexion portion 54, so that the scope is It is easily inserted along the splenic flexion portion 54.

FIG. 6B shows the display screen of the monitor 4.

As can be seen in the figure, the monitor 4 displays an image 60 of the inside of the body cavity and an identification display 61 indicating whether or not each segment is energized. Identification display 6
Reference numeral 1 is composed of a display 62 showing the guiding hollow tube 21 and a scale 63 showing the position of each segment with respect to the entire guiding hollow tube 21. For example, the gray level of the display 62 is energized and not energized. By changing with, the energization state of each segment can be seen at a glance.

Next, the region for reducing the bending rigidity of the guiding hollow tube 21 is sequentially shifted from the vicinity of the tip toward the front, and the scope is inserted while confirming the state of the shift on the identification display 61 of the monitor 4.

As described above, since the endoscope of the present embodiment is configured so that the bending rigidity of the guiding tube can be freely changed by using the shape memory alloy, the sigmoid colon can be easily formed. You can get out. Also, before inserting the scope into the bent part of the large intestine, it is possible to increase the bending rigidity of the guiding tube to make it difficult to bend, so it becomes easier to transmit the insertion force to the tip of the scope, and insertion of the scope It will be easier.

Therefore, it is not necessary to use a sliding tube, and insertion of the scope becomes very easy. Thus, the examination time is greatly reduced, the pain to the patient is reduced, and the exposure dose due to fluoroscopy is reduced.

In the above-described embodiment, the spiral tube 22 is divided into segments as shown in FIG. 4, and the electric circuit for energizing each segment is configured as shown in FIG. 5, but the spiral tube 22 is shown in FIG. Alternatively, each segment may be configured to be independently energizable by being divided into each segment via the electric insulator 71 and connected to the power source unit 72 as shown in FIG.

In the above embodiment, the keyboard 43 is used to specify the segment to be energized, but the operation unit 8 may be provided with a segment specifying switch. In this case, the segment to be energized can be easily changed while performing the insertion operation. Further, the segment may be designated automatically instead of manually using a keyboard, a designation switch, or the like.

FIG. 9 is a block diagram showing a modification in which segment designation is automatically performed.

The endoscope according to the present modification is provided with a detection section 81 capable of detecting the insertion length of the guiding tube 21 into the patient, and the power supply section 42 sets the segment to be energized to the above insertion length. It is possible to switch control accordingly. The detection unit 81 is configured to determine the insertion length by the insertion length detection circuit 82 from the output signal of the encoder 83 arranged near the guiding tube 21.

FIG. 10 shows the relative positional relationship between the encoder 83 and the guiding tube 21 of the scope.

When the endoscope of this modification is inserted into the large intestine, the encoder 83 outputs a predetermined rotational position signal due to the interaction between the guiding tube 21 and the encoder 83, and this output signal The insertion length from the splenic flexion portion is calculated by the insertion length detection circuit 82 using
Send to.

Since the power supply section 42 sequentially reduces only the bending rigidity of the segment of the spiral tube 22 corresponding to the insertion length, the operator only has to insert the scope.

While the scope and endoscope of the present invention are applied to the electronic endoscope in the above-mentioned embodiments and modifications, the scope and endoscope may be applied to a so-called fiber scope.

[0065]

As described above, the endoscope of the present invention is
In an endoscope including a guiding hollow tube capable of inserting an observing means capable of observing the inside of a body cavity of a subject to a desired position in the body hollow, the guiding hollow tube includes a first hollow member and the first hollow member. Changing the temperature of the second hollow member, which is provided inside the hollow member and is formed of a shape memory alloy that tries to return to a previously stored shape in a predetermined temperature range. A second hollow member,
Since the shape in which the outer diameter is larger than the inner diameter of the first hollow member is memorized, the scope can be easily inserted into the meandering body cavity such as the sigmoid colon and the spleen bent portion.

Further, the endoscope of the present invention is an endoscope having a guiding tube capable of inserting an observing means capable of observing the inside of a body cavity of a subject to the desired position in the body cavity, The tube is provided with a first hollow member and a second hollow provided inside the first hollow member and formed of a shape memory alloy that tries to return to a pre-stored shape in a predetermined temperature range. A member, temperature control means for changing the temperature of the second hollow member in units of a predetermined segment, and display means for displaying a control state of the temperature control means, wherein the second hollow member has an outer diameter Since it stores a shape larger than the inner diameter of the first hollow member, the scope can be easily inserted into a meandering body cavity such as the sigmoid colon, the spleen bent portion.

Further, the endoscope of the present invention is an endoscope including a guiding tube capable of inserting an observing means capable of observing the inside of a body cavity of a subject to a desired position in the body cavity. The tube is provided with a first hollow member and a second hollow provided inside the first hollow member and formed of a shape memory alloy that tries to return to a pre-stored shape in a predetermined temperature range. A member, a detection means for detecting the insertion length of the guiding tube into the subject, and a temperature control means for changing the temperature of the second hollow member in predetermined segment units based on the value detected by the detection means. Since the second hollow member has a shape in which the outer diameter is larger than the inner diameter of the first hollow member, the scope is placed in a meandering body cavity such as a sigmoid colon, a spleen bent portion, or the like. Can be easily inserted.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a guiding hollow tube of the present embodiment.

FIG. 2 is an axial sectional view of a guiding hollow tube.

FIG. 3 is a cooling system diagram including a water cooling pipe.

FIG. 4 is a diagram showing a state in which a spiral tube is divided into segments.

FIG. 5 is a block diagram showing an electric system relating to a spiral tube.

FIG. 6 (a) is a view showing a state in which the scope is linearized after the scope is inserted into the large intestine and passed through the sigmoid colon,
(b) is a diagram showing the display screen of the monitor.

FIG. 7 is a view showing a modification of segment division of the spiral tube.

FIG. 8 is a view showing a modified example of an electric circuit relating to a spiral tube.

FIG. 9 is a block diagram showing a modified example of automatically specifying a segment.

FIG. 10 is a diagram showing a relative positional relationship between an encoder and a guiding center tube of a scope.

FIG. 11 is an overall perspective view showing a conventional endoscope.

FIG. 12 is a partially cutaway perspective view showing a guiding tube of a scope included in a conventional endoscope.

[Explanation of symbols]

 3 Main Body 4 Monitor 5 Hard Section 6 Curved Section 11 Spiral Tube 12 Metal Blade 13 Rubber Outer Shell 21 Conductive Middle Tube 22 Spiral Tube (Formed of Shape Memory Alloy) 23 Cooling Pipe 41 Image Processing Section 42 Power Supply Section 43 Keyboard 81 Detection unit

Claims (7)

[Claims] 1. An endoscope including a guiding hollow tube capable of inserting an observing means capable of observing the inside of a body cavity of a subject to a desired position in the body hollow, wherein the guiding hollow tube is a first hollow member. A second hollow member provided inside the first hollow member, the second hollow member being formed of a shape memory alloy that tries to return to a pre-stored shape in a predetermined temperature range; and the second hollow member. An endoscope having a temperature control means for changing a temperature of a member, wherein the second hollow member stores a shape having an outer diameter larger than an inner diameter of the first hollow member. 2. The first and second hollow members are formed in a spiral tube shape.
The described endoscope. 3. The temperature control means utilizes Joule heat generated by passing an electric current through the second hollow member, according to any one of claims 1 and 2. Endoscope. 4. The endoscope according to claim 1, wherein the second hollow member is provided with a water cooling pipe. 5. The temperature control means changes the temperature of the second hollow member in a predetermined segment unit, according to any one of claims 1 to 4. Endoscope. 6. An endoscope including a guiding hollow tube capable of inserting an observing means capable of observing the inside of a body cavity of a subject to a desired position in the body hollow, wherein the guiding hollow tube is a first hollow member. A second hollow member provided inside the first hollow member, the second hollow member being formed of a shape memory alloy that tries to return to a pre-stored shape in a predetermined temperature range; and the second hollow member. The second hollow member has a temperature control means for changing the temperature of the member in a predetermined segment unit, and a display means for displaying the control state of the temperature control means, and the second hollow member has an outer diameter of that of the first hollow member. An endoscope characterized by remembering a shape larger than the inner diameter. 7. An endoscope provided with a guiding hollow tube capable of inserting an observing means capable of observing the inside of a body cavity of a subject to a desired position in the body hollow, wherein the guiding hollow tube is a first hollow member. A second hollow member which is provided inside the first hollow member and which is made of a shape memory alloy and which is intended to return to a pre-stored shape in a predetermined temperature range; A detection means for detecting the insertion length into the subject, and a temperature control means for changing the temperature of the second hollow member in predetermined segment units based on the value detected by the detection means,
An endoscope characterized in that the second hollow member has a shape in which the outer diameter is larger than the inner diameter of the first hollow member.