Insertion tube and endoscope

Abstract

The utility model relates to the technical field of medical equipment, and discloses an insertion tube and an endoscope, the insertion tube comprises a support part, the support part is matched with an operation unit, a working cavity is formed in the support part, the support part comprises a first support layer and a second support layer which are arranged from inside to outside, and the second support layer comprises a first support section and a second support section; the second supporting layer is arranged outside the first supporting layer, the rigidity of the first supporting layer in the length direction of the first supporting layer is different, the rigidity of the second supporting layer is of a two-section type, and the overall rigidity of the supporting part has the trend of gradually decreasing in the direction away from the operation unit. The supporting performance is better while the requirement for the rigidity of the insert tube is met, the first supporting layer, the second supporting layer and the wrapping part are directly assembled when the insert tube is manufactured, and the rigidity of the insert tube can be effectively changed without a multi-layer extrusion process.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an insertion tube and an endoscope. Background Art

[0002] An endoscope is a medical device used for visual inspection of human cavities and surgery. An endoscope usually includes an operating handle, an insertion tube, and a lens assembly. The insertion tube is a composite tubular structure. When the endoscope is used, the insertion tube is inserted into the inner cavity of the human body. The insertion tube can bend and deflect inside the human cavity under the action of external force and drive the lens assembly to rotate. In order to enable the endoscope to change the shooting angle more flexibly, improve the efficiency of the lens insertion and the controllability of the lens, the rigidity of the distal end of the insertion tube is usually required to be less than that of the proximal end.

[0003] In the related art, the stiffness variation trend of the insertion tube along the axial direction is mainly determined by the stiffness variation trend of its own resin layer. The resin layer in the related art is mostly made of materials with both processing plasticity and elasticity, and is made by multiple extrusion processes. The multiple extrusion processes in the related art can control the thickness of the resin layer formed at the current position, and change the thickness of the resin layer at each position of the insertion tube to make the stiffness of each position different. However, the operation process of the multiple extrusion processes is relatively complicated, resulting in the production process of the existing insertion tube being time-consuming, labor-intensive and inefficient. Utility Model Content

[0004] In view of this, the utility model provides an insertion tube and an endoscope to solve the problem of low efficiency in the production process of the existing insertion tube.

[0005] In a first aspect, the utility model provides an insertion tube, which is applied to an endoscope. The endoscope includes an operating unit, and the insertion tube includes: a support portion, which is connected to the operating unit and forms a working cavity inside, one end of the working cavity is connected to the operating unit, the support portion includes a first support layer and a second support layer arranged from the inside to the outside, the stiffness of the first support layer gradually decreases along the direction away from the operating unit, the second support layer includes a first support segment and a second support segment, the first support segment and the second support segment are arranged in sequence along the direction close to the operating unit, the stiffness of the first support segment is consistent with the stiffness of the end of the first support layer away from the operating unit, and the stiffness of the second support segment is consistent with the stiffness of the end of the first support layer close to the operating unit; and a covering portion, which is sleeved outside the support portion.

[0006] Beneficial effect: A second supporting layer is arranged outside the first supporting layer, the first supporting layer has different stiffness along its own length direction and the stiffness of the second supporting layer is in two stages, after the first supporting layer and the second supporting layer cooperate, the overall stiffness of the supporting part has a tendency to gradually decrease in the direction away from the operating unit, while meeting the stiffness requirements of the insertion tube and providing better supporting performance, when manufacturing the insertion tube, the first supporting layer, the second supporting layer and the covering part can be directly assembled, and there is no need to perform a multi-layer extrusion process to effectively change the stiffness of the insertion tube, which effectively solves the problem of low efficiency in the production process of existing insertion tubes.

[0007] In some embodiments, the first supporting layer includes a first mating section, a transition section, and a second mating section. The first mating section, the transition section, and the second mating section are arranged in sequence along the direction approaching the operating unit, and the stiffness of the transition section gradually decreases along the direction away from the operating unit, or the stiffness of each part of the transition section is equal, the stiffness of each part of the transition section is greater than or equal to the stiffness of the first mating section, and the stiffness of each part of the transition section is less than or equal to the stiffness of the second mating section.

[0008] Beneficial effects: The structure of the first support layer is simple and reliable, and the overall stiffness trend of the transition section can be flexibly selected according to usage requirements.

[0009] In some embodiments, the first support layer is a first spring, the pitch of the first support layer gradually decreases along the direction away from the operating unit, and / or the second support layer is a second spring, the pitch of the first support segment is smaller than the pitch of the second support segment.

[0010] Beneficial effect: The form of changing the stiffness is simple and clever, and the stiffness is changed without affecting the radial size thereof.

[0011] In some embodiments, the covering portion includes a heat shrinkable layer, the heat shrinkable layer has an inner diameter larger than an outer diameter of the support portion in an unassembled state, and the heat shrinkable layer also has an assembled state in which it cooperates with the outer wall of the support portion after heat shrinkage.

[0012] Beneficial effects: The covering part has a simple structure and is easy to install, and the heat shrinkable layer can be more closely matched with the supporting part through the heat shrinking process.

[0013] In some embodiments, the covering portion further includes a connecting layer disposed inside the heat shrinkable layer, and the heat shrinkable layer cooperates with the supporting portion through the connecting layer.

[0014] Beneficial effect: The connecting layer can make the heat shrinkable layer and the supporting part fit more closely, and can effectively reduce the gap existing during the fitting.

[0015] In some embodiments, the heat shrinkable layer is at least one of a polyester heat shrinkable tube, a polyurethane heat shrinkable tube, a silicone heat shrinkable tube, a polyvinyl chloride heat shrinkable tube, a fluororubber heat shrinkable tube, and a cross-linked polyolefin heat shrinkable tube, and / or the material of the connecting layer is at least one of ethylene-vinyl acetate copolymer, thermoplastic polyurethane, polyamide, polyester, and polyolefin.

[0016] Beneficial effects: The material sources are wide and can be flexibly selected according to the manufacturing requirements of the insertion tube.

[0017] In some embodiments, the support portion further includes a third support layer sleeved outside the second support layer, and the third support layer is arranged in a mesh shape.

[0018] Beneficial effect: The third supporting layer can improve the stress-bearing performance outside the second supporting layer. When the covering part is in close contact with the supporting part, the meshed third supporting layer can provide more uniform supporting force for various parts of the second supporting layer in the inner layer of the second supporting layer.

[0019] In some embodiments, the insertion tube further includes a friction portion disposed outside the covering portion.

[0020] Beneficial effects: The friction part can protect the scales set on the insertion tube and can also improve the wear resistance of the insertion tube.

[0021] In some embodiments, the friction portion includes at least one coating selected from the group consisting of an elastomeric coating, a wear-resistant coating, a hydrophilic coating, and an antibacterial coating.

[0022] Beneficial effect: There are many types of friction parts to choose from, which can be flexibly selected according to needs.

[0023] In a second aspect, the utility model further provides an endoscope, which comprises: an operating unit; a lens unit; the above-mentioned insertion tube, one end of which is connected to the operating unit and the other end of which is connected to the lens unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a schematic cross-sectional structure diagram of an insertion tube according to an embodiment of the utility model;

[0026] Figure 2 for Figure 1 The insertion tube shown is provided with a cross-sectional structural schematic diagram of a covering portion;

[0027] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of the insertion tube in a top view shown;

[0028] Figure 4 for Figure 1 A schematic structural diagram of the first support layer of the insertion tube shown;

[0029] Figure 5 for Figure 1 A schematic structural diagram of a second support layer of the insertion tube shown;

[0030] Figure 6 for Figure 1 The heat shrink layer of the insertion tube is shown in cross section, and the connecting layer is not shown in cross section;

[0031] Figure 7 for Figure 2 A schematic diagram showing the insertion tube in cooperation with the operating unit is shown.

[0032] Description of reference numerals:

[0033] 1. Supporting part; 101. First supporting layer; 1011. First matching section; 1012. Transition section; 1013. Second matching section; 102. Second supporting layer; 1021. First supporting section; 1022. Second supporting section; 103. Third supporting layer; 2. Covering part; 201. Heat shrinkable layer; 202. Connecting layer; 3. Friction part; 4. Operating unit. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0035] Combine the following Figures 1 to 7 , describing an embodiment of the utility model.

[0036] According to an embodiment of the utility model, on the one hand, an insertion tube is provided, which is applied to an endoscope, the endoscope includes an operating unit 4, and the insertion tube includes: a support part 1 and a covering part 2, the support part 1 is connected to the operating unit 4 and forms a working cavity inside, one end of the working cavity is connected to the operating unit 4, the support part 1 includes a first support layer 101 and a second support layer 102 arranged from the inside to the outside, the stiffness of the first support layer 101 gradually decreases along the direction away from the operating unit 4, the second support layer 102 includes a first support segment 1021 and a second support segment 1022, the first support segment 1021 and the second support segment 1022 are arranged in sequence along the direction close to the operating unit 4, the stiffness of the first support segment 1021 is consistent with the stiffness of the end of the first support layer 101 away from the operating unit 4, the stiffness of the second support segment 1022 is consistent with the stiffness of the end of the first support layer 101 close to the operating unit 4, and the covering part 2 is sleeved outside the support part 1.

[0037] In the insertion tube of the present embodiment, the second supporting layer 102 is arranged outside the first supporting layer 101. The first supporting layer 101 has different stiffness along its own length direction, while the stiffness of the second supporting layer 102 is in two stages. After the first supporting layer 101 and the second supporting layer 102 cooperate with each other, the overall stiffness of the support portion 1 has a tendency to gradually decrease in the direction away from the operating unit 4, which not only meets the stiffness requirements of the insertion tube, but also has better supporting performance. When manufacturing the insertion tube, the first supporting layer 101, the second supporting layer 102 and the covering portion 2 can be directly assembled. There is no need to use a multi-layer extrusion process to effectively make the stiffness of different parts of the insertion tube different, which effectively solves the problem of low efficiency in the production process of existing insertion tubes.

[0038] Specifically, in the related art, the insertion tube can also change its stiffness at different positions by controlling the feed ratio of soft and hard raw materials in the resin layer, but the resin layer still needs to be formed by multi-layer extrusion. Since the extrusion process is difficult to control, there is still a problem of high defective rate.

[0039] In this embodiment, the covering portion 2 is no longer manufactured through an extrusion process. It is only necessary to make the first supporting layer 101 and the second supporting layer 102 have different stiffnesses at different positions. The required insertion tube can be directly assembled later, which effectively improves the assembly efficiency and increases the yield rate.

[0040] In this embodiment, the first supporting layer 101 includes a first matching section 1011, a transition section 1012 and a second matching section 1013. The first matching section 1011, the transition section 1012 and the second matching section 1013 are arranged in sequence along the direction close to the operating unit 4. The stiffness of the transition section 1012 gradually decreases along the direction away from the operating unit 4, or the stiffness of each part of the transition section 1012 is equal, the stiffness of each part of the transition section 1012 is greater than or equal to the stiffness of the first matching section 1011, and the stiffness of each part of the transition section 1012 is less than or equal to the stiffness of the second matching section 1013. The structural form of the first supporting layer 101 is simple and reliable, and the overall stiffness trend of the transition section 1012 can be flexibly selected according to usage requirements.

[0041] Furthermore, if Figure 4 and Figure 5 As shown, the first supporting layer 101 includes a first matching segment 1011, a transition segment 1012 and a second matching segment 1013. The first matching segment 1011 is formed at one end of the first supporting layer 101 away from the operating unit 4, and the second matching segment 1013 is formed at one end of the first supporting layer 101 close to the operating unit 4. The segment in the first supporting layer 101 connecting the first matching segment 1011 and the second matching segment 1013 is the transition segment 1012. The stiffness of the first matching segment 1011, the transition segment 1012 and the second matching segment 1013 increases sequentially.

[0042] Preferably, since the transition section 1012 is a longer section in the middle of the first supporting layer 101 , the rigidity of the transition section 1012 gradually decreases in a direction away from the operating unit 4 .

[0043] It can be understood that it is not strictly limited that the stiffness of the transition section 1012 gradually decreases in the direction away from the operating unit 4, and the stiffness of each part of the transition section 1012 can also have the same stiffness.

[0044] Among them, the stiffness of the first supporting section 1021 is consistent with the stiffness of the first matching section 1011, the stiffness of the second supporting section 1022 is consistent with the stiffness of the second matching section 1013, the first supporting section 1021 cooperates with the first matching section 1011 and a part of the transition section 1012 at the same time, and the second supporting section 1022 cooperates with the second matching section 1013 and another part of the transition section 1012 at the same time.

[0045] In addition, it should be noted that there is no limitation on the method of making the stiffness of different parts of the first supporting layer 101 and the second supporting layer 102 different, and the method may be to change the material, change the thickness, etc.

[0046] In this embodiment, the covering portion 2 and the supporting portion 1 together form a tubular structure.

[0047] In this embodiment, the first supporting layer 101 and the second supporting layer 102 are both elastic members. The first supporting layer 101 and the second supporting layer 102 have better resilience, higher strength and better supporting performance.

[0048] Specifically, there is no limitation on the specific types of the first supporting layer 101 and the second supporting layer 102 , and they may be tubular structures formed of materials such as plastic and rubber, or tubular springs formed of metal, plastic or rubber.

[0049] In this embodiment, the first support layer 101 is a first spring, and the pitch of the first support layer 101 gradually decreases along the direction away from the operating unit 4, and / or the second support layer 102 is a second spring, and the pitch of the first support segment 1021 is smaller than the pitch of the second support segment 1022. The form of changing the stiffness is simple and clever, and changing the stiffness will not affect its own radial size.

[0050] It can be understood that, as an alternative embodiment, the first spring and the second spring can also have different stiffness at different locations by changing the wire diameter or the thickness of the sheet structure constituting the spring.

[0051] Specifically, in some embodiments, the first support layer 101 and the first support layer 101 are springs formed by bending a sheet structure, such as Figure 4 and Figure 5 As shown, L1 represents the pitch at the first support section 1021, L2 represents the pitch at the second support section 1022, L3 represents the pitch at the first matching section 1011, L4 represents the pitch at the transition section 1012, L5 represents the pitch at the second matching section 1013, and D represents the width of the first support layer 101 and the sheet structure of the first support layer 101, wherein L1=L3, L2=L5, D>L3≥L4≥L5, the width of the sheet structure is greater than the pitch to ensure that the supporting function of the first support layer 101 and the first support layer 101 meets the use requirements, and at the same time, since the thickness of the first support layer 101 and the sheet structure of the first support layer 101 is itself thin, if the width of the sheet structure is less than the pitch of the spring, it is easy to deform during repeated bending.

[0052] It should be noted that, since L4 represents the pitch at the transition section 1012 , the pitch of the transition section 1012 near the end may be consistent with that of the first matching section 1011 or the second matching section 1013 .

[0053] Furthermore, there is no limitation on the rotation direction of the first supporting layer 101 and the second supporting layer 102 , and they may be in the same direction or in opposite directions.

[0054] Preferably, the first support layer 101 and the second support layer 102 are springs formed by curling metal sheets, the first support layer 101 and the second support layer 102 rotate in opposite directions, and the first support layer 101 and the second support layer 102 are made of 304 stainless steel material.

[0055] In this embodiment, the covering portion 2 includes a heat shrinkable layer 201, and the heat shrinkable layer 201 has an unassembled state in which the inner diameter is larger than the outer diameter of the supporting portion 1. The heat shrinkable layer 201 also has an assembled state in which it cooperates with the outer wall of the supporting portion 1 after heat shrinkage. The covering portion 2 has a simple structure and is easy to install. The heat shrinkable layer 201 can cooperate more closely with the supporting portion 1 through the heat shrinking process.

[0056] Specifically, there is no limitation on the number of the heat shrinkable layer 201 , and the number of layers can be selected according to the needs.

[0057] Among them, since the heat shrinkable layer 201 is made of heat shrinkable material and has the characteristics of softening at high temperature and shrinking when cooled when not assembled, the heat shrinkable layer 201 can be tightly fitted with the support part 1 after heat shrinkage processing. This form of insertion tube assembly process is simple and quick, which can effectively reduce the difficulty of insertion tube production.

[0058] In this embodiment, the covering portion 2 also includes a connecting layer 202 arranged on the inner side of the heat shrinkable layer 201. The heat shrinkable layer 201 cooperates with the supporting portion 1 through the connecting layer 202. The connecting layer 202 can make the heat shrinkable layer 201 and the supporting portion 1 fit more closely, which can effectively reduce the gap existing during fitting.

[0059] In this embodiment, the heat shrink layer 201 is at least one of a polyester heat shrink tube, a polyurethane heat shrink tube, a silicone heat shrink tube, a polyvinyl chloride heat shrink tube, a fluororubber heat shrink tube and a cross-linked polyolefin heat shrink tube, and / or the material of the connecting layer 202 is at least one of ethylene-vinyl acetate copolymer, thermoplastic polyurethane, polyamide, polyester and polyolefin. The material sources are wide and can be flexibly selected according to the manufacturing requirements of the insertion tube.

[0060] Specifically, the polyester heat shrink tube, polyurethane heat shrink tube, silicone heat shrink tube, polyvinyl chloride heat shrink tube, fluororubber heat shrink tube and cross-linked polyolefin heat shrink tube can refer to the structure and construction of the existing corresponding types of heat shrink tubes, which will not be described in detail here.

[0061] In this embodiment, the support portion 1 also includes a third support layer 103 which is sleeved outside the second support layer 102. The third support layer 103 is arranged in a mesh shape. The third support layer 103 can improve the force-bearing performance of the outer side of the second support layer 102. When the covering portion 2 is tightly attached to the support portion 1, the mesh third support layer 103 can provide more uniform supporting force for various parts of the second support layer 102 on the inner side of the second support layer 102.

[0062] Specifically, the third supporting layer 103 is a mesh structure woven from metal, which is stronger and more durable.

[0063] In this embodiment, the insertion tube also includes a friction portion 3 arranged outside the covering portion 2. The friction portion 3 can not only improve the wear resistance of the insertion tube, but also improve the flexibility of the insertion tube. The friction portion 3 can protect the scale set on the insertion tube and also improve the wear resistance of the insertion tube.

[0064] The friction portion 3 refers to the portion located at the outermost layer of the insertion tube and mainly rubs against the outside.

[0065] Specifically, there is no strict limitation on the material and thickness of the friction part 3 , and they can be selected according to actual manufacturing requirements.

[0066] In this embodiment, the friction part 3 includes at least one coating selected from the group consisting of an elastomeric coating, a wear-resistant coating, a hydrophilic coating, and an antibacterial coating. There are many types of optional coatings for the friction part 3, which can be flexibly selected according to needs.

[0067] In this embodiment, the material of the friction part 3 is at least one of thermoplastic polyurethane elastomer, thermoplastic polyolefin elastomer and thermoplastic polyester elastomer. The friction part 3 made of such material has better resilience performance.

[0068] In addition, it should be noted that if Figure 2 and Figure 3 As shown, since the friction part 3 will be in direct contact with the human body, the friction part 3 mainly plays the role of protecting the scale and improving the wear resistance to facilitate insertion of the mirror. The friction part 3 can prevent the scale from being rubbed or disappearing due to corrosion caused by washing. Therefore, the thickness of the friction part 3 does not need to be set too thick, and the thickness of the friction part 3 can be less than or equal to the thickness of the covering part 2.

[0069] Specifically, there is no limitation on the molding method of the friction part 3 , and molding methods such as brushing, spraying, spin coating, and dipping may be used but are not limited to.

[0070] The following is a description of the manufacturing process of the insertion tube of this embodiment:

[0071] The spring structure of the second supporting layer 102 is sleeved outside the first supporting layer 101, and a braiding machine is used to weave a metal braided mesh outside the second supporting layer 102 to form the third supporting layer 103. The first supporting layer 101, the second supporting layer 102 and the third supporting layer 103 form a tubular structure; the two ends of the tube are soldered and polished; a core rod is inserted into the inside of the first supporting layer 101, and the covering part 2 is sleeved outside the metal braided mesh, and a heat shrinkage treatment is performed within a certain heat shrinkage temperature range, so that the covering part 2 is tightly combined with the third supporting layer 103; and the friction part 3 is formed by coating the outside of the covering part 2.

[0072] According to an embodiment of the present invention, on the other hand, an endoscope is provided, which includes: an operating unit 4, a lens unit and the above-mentioned insertion tube, one end of the insertion tube is connected to the operating unit 4 and the other end is connected to the lens unit.

[0073] In this embodiment, the endoscope further includes necessary components such as an image display unit and a power supply unit.

[0074] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An insertion tube for use in an endoscope, the endoscope comprising an operating unit (4), characterized in that: The insertion tube comprises: A support portion (1) connected to the operating unit (4) and forming a working cavity therein, one end of the working cavity being in communication with the operating unit (4), the support portion (1) comprising a first supporting layer (101) and a second supporting layer (102) arranged from the inside to the outside, the rigidity of the first supporting layer (101) gradually decreasing in a direction away from the operating unit (4), the second supporting layer (102) comprising a first supporting segment (1021) and a second supporting segment (1022), the first supporting segment (1021) and the second supporting segment (1022) being arranged in sequence in a direction approaching the operating unit (4), the rigidity of the first supporting segment (1021) being consistent with the rigidity of one end of the first supporting layer (101) away from the operating unit (4), and the rigidity of the second supporting segment (1022) being consistent with the rigidity of one end of the first supporting layer (101) close to the operating unit (4); The covering portion (2) is sleeved outside the supporting portion (1).

2. The insertion tube according to claim 1, characterized in that The first supporting layer (101) comprises a first matching section (1011), a transition section (1012) and a second matching section (1013); the first matching section (1011), the transition section (1012) and the second matching section (1013) are arranged in sequence along a direction approaching the operating unit (4); the rigidity of the transition section (1012) gradually decreases along a direction away from the operating unit (4); Alternatively, the stiffness of each part of the transition section (1012) is equal, the stiffness of each part of the transition section (1012) is greater than or equal to the stiffness of the first matching section (1011), and the stiffness of each part of the transition section (1012) is less than or equal to the stiffness of the second matching section (1013).

3. The insertion tube according to claim 1, characterized in that The first supporting layer (101) is a first spring, and the pitch of the first supporting layer (101) gradually decreases in a direction away from the operating unit (4). And / or, the second supporting layer (102) is a second spring, and the pitch of the first supporting segment (1021) is smaller than the pitch of the second supporting segment (1022).

4. The insertion tube according to any one of claims 1 to 3, characterized in that The covering portion (2) comprises a heat shrinkable layer (201), wherein the heat shrinkable layer (201) has an inner diameter greater than an outer diameter of the support portion (1) in an unassembled state, and the heat shrinkable layer (201) also has an assembled state in which it cooperates with the outer wall of the support portion (1) after heat shrinkage.

5. The insertion tube according to claim 4, characterized in that The covering portion (2) further comprises a connecting layer (202) arranged on the inner side of the heat shrinkable layer (201), and the heat shrinkable layer (201) cooperates with the supporting portion (1) via the connecting layer (202).

6. The insertion tube according to claim 5, characterized in that The heat shrinkable layer (201) is one of a polyester heat shrinkable tube, a polyurethane heat shrinkable tube, a silicone heat shrinkable tube, a polyvinyl chloride heat shrinkable tube, a fluororubber heat shrinkable tube and a cross-linked polyolefin heat shrinkable tube. And / or, the material of the connecting layer (202) is one of ethylene-vinyl acetate copolymer, thermoplastic polyurethane, polyamide, polyester and polyolefin.

7. The insertion tube according to any one of claims 1 to 3, characterized in that The support portion (1) further comprises a third support layer (103) sleeved outside the second support layer (102), and the third support layer (103) is arranged in a mesh shape.

8. The insertion tube according to any one of claims 1 to 3, characterized in that The insertion tube further comprises a friction portion (3) arranged outside the covering portion (2).

9. The insertion tube according to claim 8, characterized in that The friction part (3) comprises at least one coating selected from the group consisting of an elastomeric coating, a wear-resistant coating, a hydrophilic coating and an antibacterial coating.

10. An endoscope, characterized in that: include: Operation unit (4); Lens unit; The insertion tube according to any one of claims 1 to 9, one end of which is connected to the operating unit (4) and the other end of which is connected to the lens unit.

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