Tube body capable of maintaining bending shape of local tube section and endoscope

Abstract

The utility model discloses a pipe body with a local pipe section capable of maintaining the bending shape and an endoscope, the pipe body with the local pipe section capable of maintaining the bending shape comprises a pipe main body and a pipe sleeve, and the pipe main body is assembled on an operation main body and is partially bent to form a bent pipe section; the pipe sleeve is suitable for the bent pipe section to extend in an arc shape and fixedly connected to the outer side of the bent pipe section in a sleeving mode, and the pipe sleeve is made of hard metal materials. According to the utility model, when the bent pipe section is stressed and has a bending deformation trend or a tensile deformation trend, the deformation trend can be effectively restrained by virtue of the rigidity of the pipe sleeve, so that continuous bending deformation and continuous tensile deformation of the bent pipe section can be greatly reduced in the long-term repeated use process, and the use quality of the pipe body and the endoscope is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of endoscopes, and in particular to a tube body and an endoscope whose local tube section bending shape can be maintained. Background Art

[0002] The endoscope in the prior art is generally provided with a tube body, which forms a working channel. The working channel can be used for the insertion of diagnostic instruments such as stone removal baskets, biopsy forceps, laser optical fibers, etc. Since the tube body is generally inserted through the operating body to the insertion body, and a local tube section needs to be bent in the operating body to adapt to the installation, a bending corner will be formed in the operating body.

[0003] During use, due to repeated insertion of diagnostic and treatment instruments, during each insertion process, the diagnostic and treatment instruments will inevitably pierce the bending corners, causing bending and stretching deformation of the bending corners. In addition, due to repeated sterilization of the endoscope, especially when the tube body is made of pebax (polyether block polyamide) material and alcohol is used for sterilization, the bending corners will be further bent and stretched. In this way, the structure of the endoscope is damaged, which increases the difficulty of inserting subsequent diagnostic and treatment instruments and causes inconvenience in operation. Utility Model Content

[0004] The main purpose of the utility model is to provide a tube body and an endoscope with a locally maintained bending shape of the tube section, aiming to solve the problem that the tube body forming the working channel in the traditional technology is easily bent and stretched locally.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a tube body with a partially maintained bending shape, which is applied to an endoscope and includes:

[0006] A tube body, which is used to be assembled on an operating body of an endoscope, and after assembly, a local bend of the tube body forms a bent tube section; and

[0007] The pipe sleeve is suitable for the shape of the curved pipe section and extends in an arc shape, and is fixedly sleeved on the outer side of the curved pipe section. The pipe sleeve is made of a hard metal material.

[0008] Optionally, the sleeve is provided with a clearance hole along the thickness direction thereof, and the clearance hole is used to make way during the processing of the sleeve to form an arc shape, wherein:

[0009] The clearance hole extends in an elongated shape along the circumference of the sleeve; and / or,

[0010] A plurality of the clearance holes are arranged at intervals along the axial direction of the sleeve.

[0011] Optionally, the clearance hole has two first side walls arranged opposite to each other in the circumferential direction of the sleeve, and two second side walls connected between the two first side walls;

[0012] The first side wall is arranged in an arc shape.

[0013] Optionally, the clearance hole has two first side walls arranged opposite to each other in the circumferential direction of the sleeve, and two second side walls connected between the two first side walls;

[0014] After the sleeve is formed into an arc shape, the two second side walls are spaced apart in the axial direction of the sleeve.

[0015] Optionally, the sleeve is provided with a recess along the thickness direction thereof;

[0016] The pipe body is made of a material that can be triggered to deform under set conditions. When triggered under the set conditions, the pipe sleeve and at least part of the curved pipe section are squeezed against each other to form a convex portion filled in the concave portion on the outer surface of the curved pipe section.

[0017] Optionally, at least two recesses are spaced apart along the length direction of the sleeve, and at least two protrusions are formed on each of the recesses.

[0018] Optionally, the tube body is made of a polyether block polyamide material, and the polyether block polyamide material expands and deforms under the stimulation of alcohol to form the convex portion; and / or,

[0019] The sleeve is provided with a clearance hole along the thickness direction thereof, and the clearance hole constitutes the recess.

[0020] Optionally, the sleeve is provided with an elastic layer at least on the inner surface of the recess.

[0021] Optionally, the pipe body capable of maintaining the bending shape of the local pipe segment further comprises a colloid, which is applied to the inner surface of the pipe sleeve before the pipe sleeve and the bent pipe segment are sleeved together, and solidified when the sleeve and the bent pipe segment are sleeved together to form an elastic layer.

[0022] In addition, to achieve the above-mentioned purpose, the utility model also provides an endoscope, comprising:

[0023] The operating body is formed with a mounting cavity and two mounting holes respectively disposed at one axial end and one side end of the mounting cavity; and

[0024] As described above, the tube body with a partially maintained curved shape, the tube body movably enters from one of the mounting holes, passes through the mounting cavity and movably exits from the other mounting hole, and the portion of the tube body between the two mounting holes defines the curved tube section.

[0025] In the technical solution provided by the utility model, a working channel is formed inside the tube body. In order to adapt to the installation environment of the operating body, a local tube section of the tube body is bent to form a bent tube section. Since the tube sleeve itself is made of hard metal material, it is not easy to produce bending deformation and / or stretching deformation due to external force, and the rigidity is greater than the rigidity of the bent tube section. When the bent tube section is subjected to force and has a tendency to bend or stretch, the rigidity of the tube sleeve can be used to effectively restrain the deformation tendency, thereby helping to greatly reduce the continued bending deformation and continued stretching deformation of the bent tube section during long-term and multiple uses, thereby ensuring the use quality of the tube body and the endoscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 A three-dimensional schematic diagram of an embodiment of an endoscope applied to a tube body with a partially maintained bending shape of the tube section provided by the utility model;

[0028] Figure 2 for Figure 1 An enlarged schematic diagram of the assembly of the pipe body where the bending shape of the local pipe section can be maintained;

[0029] Figure 3 for Figure 2 A three-dimensional schematic diagram of the middle pipe sleeve;

[0030] Figure 4 for Figure 2 A schematic diagram of a first embodiment of the assembly of the middle pipe sleeve and the bent pipe section;

[0031] Figure 5 for Figure 2 Schematic diagram of a second embodiment of the assembly of the middle pipe sleeve and the bent pipe section.

[0032] Description of Figure Numbers:

[0033] 1 operating body; 11 mounting cavity; 12 mounting member; 110 pipe body; 111 bent pipe section; 112 convex portion; 120 pipe sleeve; 121 clearance hole; 121a first side wall; 121b second side wall; 122 concave portion; 2 inserting body.

[0034] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0038] See also Figures 1 to 5 The utility model provides an endoscope, which includes an operating body 1 and an insertion body 2.

[0039] During the operation, the insertion body 2 is a component mainly used to be inserted into the patient's body. The insertion body 2 is generally in a longitudinal shape and has a plurality of channels therein. The front end of the insertion body 2 can generally be integrated with at least one electronic component according to actual needs. The electronic component is, for example, but not limited to, an imaging device for capturing images or videos, a lighting device for providing a light source, etc.

[0040] The operating body 1 is a component that is mainly exposed outside the patient's body and is used for medical staff to operate. By performing corresponding operations on the operating body 1, the movement of at least the front section of the insertion body 2 in the patient's body can be accurately controlled. The operating body 1 can generally include a shell. The shell can be composed of a single shell plate structure, or it can be composed of at least two shell plate structures that are detachably connected. The shell defines a mounting cavity 11. For ease of understanding, if the operating body 1 is defined as having an axial and radial arrangement that are cross-set, the insertion body 2 is inserted and connected to one axial end of the operating body 1, and extends along the axial length of the operating body 1.

[0041] In addition, the endoscope also includes a tube body with a partially maintained curved shape, and the tube body with a partially maintained curved shape has a working channel extending along its axial direction. The tube body with a partially maintained curved shape is generally installed in the operating body 1 at one section, and the other section is inserted into the insertion body 2, and is inserted or exposed from the front end of the insertion body 2. In this way, according to actual surgical needs, medical staff can operate diagnostic and treatment instruments such as stone removal baskets and biopsy forceps to be inserted into the working channel and extended to the axial end of the insertion body 2, so as to perform diagnostic and treatment operations on the diseased part in the patient's body.

[0042] In actual application, the operating body 1 is generally provided with mounting holes at one axial end and one radial side, and mounting parts 12 are provided at corresponding mounting holes. The mounting parts 12 provided at the axial end of the operating body 1 can be used for the insertion body 2 and the pipe body with a partially maintained curved shape to be inserted and fixed at the same time; the mounting parts 12 provided at one radial side of the operating body 1 can be used for the pipe body with a partially maintained curved shape to be inserted and fixed. Since the two mounting holes are oriented in different directions, when the pipe body with a partially maintained curved shape is installed in place in the operating body 1, it will inevitably be bent between the two mounting parts 12 to form a curved pipe section 111.

[0043] In view of this, in the tube body with a partially maintained curved shape of the tube section provided by the present invention, the tube body with a partially maintained curved shape of the tube section includes a tube body 110 and a constraint structure. The tube body 110 is also the above-mentioned elongated structure mainly used for assembly on the operating body 1 of the endoscope, and after assembly, the partial bending of the tube body 110 forms a curved tube section 111; the constraint structure is fixedly connected to at least the inner concave side and / or the outer convex side of the curved tube section 111, and the constraint structure is made of a rigid material, and the rigidity of the constraint structure is at least greater than the rigidity of the curved tube section 111.

[0044] In the technical solution provided by the utility model, a working channel is formed inside the tube body 110. In order to adapt to the installation environment of the operating body 1, a local tube section of the tube body 110 is bent to form a bent tube section 111. Since the constraint structure itself is made of rigid material, it is not easy to bend and / or stretch under external force. Deformation; and since the rigidity of the constraint structure is greater than the rigidity of the bent tube section 111, when the bent tube section 111 is subjected to force and has a tendency to bend or stretch, the rigidity of the constraint structure can be used to effectively restrain the deformation tendency, thereby helping to greatly reduce the continued bending deformation and continued stretching deformation of the bent tube section 111 during long-term and multiple uses, and ensuring the use quality of the tube body and endoscope that can maintain the bending shape of the local tube section.

[0045] It can be understood that the constraint structure is a structure that can exert a constraint on the pipe body 110. The constraint can be unidirectional or multi-directional. Since the main purpose of this design is to overcome the bending deformation and tensile deformation of the curved pipe section 111 of the pipe body 110 due to stress during use, in this design, the constraint structure can mainly exert axial constraint and radial constraint on the curved pipe section 111 of the pipe body 110.

[0046] On the one hand, the constraint structure is made of a rigid material, so relatively speaking, when the constraint structure itself is subjected to external force, the constraint structure itself is considered to be basically free of axial and radial deformation, that is, the deformation will not be transmitted to the pipe body 110 connected and fixed thereto. On the other hand, the rigidity of the constraint structure is at least greater than the rigidity of the bent pipe section 111, so when the constraint structure and the bent pipe section 111 are subjected to external force at the same time, or only the bent pipe section 111 is subjected to external force, even if the bent pipe section 111 has a tendency to produce axial and radial deformation, this tendency will be consumed by damping under the support of the rigidity of the constraint structure.

[0047] Of course, there are many material selection schemes for the constraint structure that can achieve the above purpose. It should be noted that the rigid material as mentioned above refers to a material that is relatively not easily deformed by external forces, which can be, but is not limited to, for example, a polymer composite material with a certain strength, a metal material with a certain hardness, etc. Figures 1 to 5 In the illustrated solution, the restraining structure is mainly made of stainless steel, which can meet the required rigidity and is not easily corroded during long-term use and sterilization.

[0048] In addition, the constraint structure includes a sheet body, which is adapted to the shape and size of the inner concave outer surface of the curved pipe segment 111, or the outer convex outer surface of the curved pipe segment 111, and the two are connected and fixed by clamping, bonding, adsorption, etc. In this way, the constraint structure is in surface contact with the inner concave outer surface of the curved pipe segment 111 and / or the outer convex outer surface of the curved pipe segment 111, and can form constraints at least in the axial and radial directions.

[0049] Or in one embodiment, the restraining structure includes a sleeve 120, which is suitable for the curved pipe section 111 to extend in an arc shape, and the sleeve 120 is fixedly sleeved on the outer side of the curved pipe section 111. The arrangement of the sleeve 120, on the one hand, can simultaneously connect and fix the inner concave outer surface of the curved pipe section 111 and the outer convex outer surface of the curved pipe section 111, thereby increasing the effective area of ​​the sleeve 120 and the pipe body 110; on the other hand, the sleeve 120 and the pipe body 110 are easier to disassemble and assemble.

[0050] As described above, the pipe sleeve 120 can be made of stainless steel, and the shape of the pipe sleeve 120 is set to match the shape of the curved pipe section 111. At this time, the pipe sleeve 120 can be directly formed by, for example, injection molding, stamping molding, smelting molding, etc. Or in one embodiment, the pipe sleeve 120 is provided with a clearance hole 121 along its thickness direction, and the clearance hole 121 is used to make way during the processing of the pipe sleeve 120 to form an arc shape. That is, the clearance hole 121 is opened on one side of the pipe sleeve 120 to form an escape space. When, for example, under suitable processing conditions such as temperature, the escape space can be used for the straight pipe sleeve 120 to be bent into an arc.

[0051] In actual application, the clearance hole 121 is elongated along the circumference of the pipe sleeve 120. However, it should be noted that the extension length of the clearance hole 121 along the circumference of the pipe sleeve 120 needs to be set within an appropriate range. If the elongated extension length of the clearance hole 121 is too long, the strength of the pipe sleeve 120 in the circumferential direction is easily affected; on the contrary, if the length of the clearance hole 121 along the circumference of the pipe sleeve 120 is too short, it is easy to make the pipe sleeve 120 difficult to be bent.

[0052] And / or in actual application, a plurality of the clearance holes 121 are arranged at intervals along the axial direction of the pipe sleeve 120. In this case, the plurality of clearance holes 121 are arranged on the same side of the pipe sleeve 120. In this way, when bending, the side of the pipe sleeve 120 without the clearance holes 121 corresponds to the convex side of the bent pipe section 111, which can effectively limit the further bending deformation of the bent pipe section 111.

[0053] Specifically, the clearance hole 121 has two first side walls 121a that are arranged opposite to each other in the circumferential direction of the sleeve 120, and two second side walls 121b connected between the two first side walls 121a. In view of this:

[0054] In one embodiment, the first side wall 121a is configured in an arc shape, so that the connecting arc transition between the two second side walls 121b does not form a sharp corner, thereby helping the sleeve 120 not to break easily during bending.

[0055] And / or in one embodiment, after the sleeve 120 is formed into an arc shape, the two second side walls 121b are spaced apart in the axial direction of the sleeve 120. That is, after the sleeve 120 is bent and formed, a certain spacing space is still reserved between the two second side walls 121b. The two second side walls 121b are not directly abutted, which helps to limit excessive bending of the sleeve 120 during the forming process on the one hand; on the other hand, when the sleeve 120 is sleeved on the outside of the bent pipe section 111, when subjected to an axial external force, the spacing between the two second side walls 121b can buffer and consume the axial external force to a certain extent.

[0056] In order to enhance the restraining effect of the pipe sleeve 120 on the curved pipe section 111, the pipe sleeve 120 can be directly set to be interference-connected with at least the curved pipe section 111 of the pipe body 110, that is, the inner diameter of the pipe sleeve 120 is set to be equal to the outer diameter of at least the curved pipe section 111 of the pipe body 110, or the inner diameter of the pipe sleeve 120 is slightly smaller than the outer diameter of at least the curved pipe section 111 of the pipe body 110. However, it can be understood that this will be disadvantageous to the sleeve connection operation of the pipe sleeve 120 relative to the pipe body 110 to a certain extent.

[0057] Therefore, in one embodiment, after the sleeve 120 and the curved pipe section 111 are sleeved and fixed, at least a part of the connection between the sleeve 120 and the curved pipe section 111 is pressed against each other under the triggering of the set condition, so as to limit the deformation of the curved pipe section 111 relative to the sleeve 120. In this way, the size restrictions on the sleeve 120 and the curved pipe section 111 before and during the sleeve connection are reduced to a certain extent. In practical applications, the inner diameter of the sleeve 120 can be set to be appropriately larger than the outer diameter of at least the curved pipe section 111 of the pipe body 110, so as to facilitate the sleeve connection operation of the sleeve 120 relative to the pipe body 110 more smoothly and unimpeded. When the sleeve connection is completed, only the set condition needs to be applied to trigger the radial deformation of the sleeve 120 and / or the curved pipe section 111, so that the connection between the sleeve 120 and the curved pipe section 111 is pressed against each other, forming a relatively large interference force, which can effectively limit the radial displacement and axial displacement of the sleeve 120 and the curved pipe section 111.

[0058] Of course, it should be noted that the local radial deformation of the pipe sleeve 120 and / or the bent pipe section 111 triggered above is set to be far from sufficient to affect the service life of the pipe sleeve 120 and / or the bent pipe section 111.

[0059] The specific scheme of setting the conditions is associated with the materials of the sleeve 120 and / or the curved pipe section 111 that are triggered to generate radial deformation, and can be but not limited to:

[0060] In one embodiment, at least one of the pipe sleeve 120 and the curved pipe section 111 is made of a water-swellable material, and the set condition is a set amount of water. It can be understood that in order to make the sleeve connection operation smooth, a certain gap is reserved between the pipe sleeve 120 and the curved pipe section 111. The pipe sleeve 120 and / or the curved pipe section 111 are made of a water-swellable material, so that when a set amount of water is provided, the pipe sleeve 120 and / or the curved pipe section 111 will produce radial expansion deformation, and the expansion deformation amount is sufficient to eliminate the gap, so that the pipe sleeve 120 and / or the curved pipe section 111 are tightly sleeved. Specific examples of water-swellable materials include polyacrylamide gel, sodium polyacrylate gel, etc.

[0061] And / or in one embodiment, at least one of the pipe sleeve 120 and the curved pipe section 111 is made of an alcohol expansion material, and the set condition is a set amount of alcohol. It can be understood that the pipe sleeve 120 and / or the curved pipe section 111 are made of a material that can expand when exposed to alcohol, so that when a set amount of alcohol is provided, the pipe sleeve 120 and / or the curved pipe section 111 will produce radial expansion deformation, and the expansion deformation amount is sufficient to eliminate the gap, so that the pipe sleeve 120 and / or the curved pipe section 111 are tightly sleeved. The alcohol expansion material is specifically, for example, a polyether block polyamide material (also commonly known as pebax material).

[0062] And / or in one embodiment, at least one of the pipe sleeve 120 and the curved pipe section 111 is made of a temperature-variable expansion material, and the set condition is a set temperature value. It can be understood that the pipe sleeve 120 and / or the curved pipe section 111 are made of a temperature-variable expandable material, so that when a set temperature value is provided, the pipe sleeve 120 and / or the curved pipe section 111 will produce radial expansion deformation, and the expansion deformation amount is sufficient to eliminate the gap, so that the pipe sleeve 120 and / or the curved pipe section 111 are tightly sleeved. The temperature-variable expansion material can specifically be a temperature-increasing expansion material or a temperature-reducing expansion material.

[0063] And / or in one embodiment, the pipe sleeve 120 is made of a temperature-dependent shrinkage material, and the setting condition is a set temperature value. At this time, when the set temperature value is provided, the pipe sleeve 120 will produce radial shrinkage deformation to tightly cover the curved pipe section 111.

[0064] And / or in one embodiment, at least one of the pipe sleeve 120 and the curved pipe section 111 is made of a magneto-expansion material, and the set condition is a set magnetic field value. It can be understood that the pipe sleeve 120 and / or the curved pipe section 111 are made of a magneto-expansion material, that is, a magneto-elongation material, so that when a set temperature value is provided, the pipe sleeve 120 and / or the curved pipe section 111 will produce radial expansion deformation, and the expansion deformation amount is sufficient to eliminate the gap, so that the pipe sleeve 120 and / or the curved pipe section 111 are tightly sleeved.

[0065] And / or in one embodiment, the sleeve 120 is made of a magnetostrictive material, and the setting condition is a set magnetic field value. At this time, when the set magnetic field value is provided, the sleeve 120 will produce radial contraction deformation and tightly wrap the curved pipe section 111.

[0066] And / or in one embodiment, at least one of the pipe sleeve 120 and the curved pipe section 111 is made of an electroexpandable material, and the set condition is a set electric field value. It can be understood that the pipe sleeve 120 and / or the curved pipe section 111 are made of an electroexpandable material, that is, an electroextensible material, so that when a set temperature value is provided, the pipe sleeve 120 and / or the curved pipe section 111 will produce radial expansion deformation, and the expansion deformation amount is sufficient to eliminate the gap, so that the pipe sleeve 120 and / or the curved pipe section 111 are tightly sleeved.

[0067] And / or in one embodiment, the tube sleeve 120 is made of an electroconstrictive material, and the setting condition is a set electric field value. At this time, when the set electric field value is provided, the tube sleeve 120 will produce radial contraction deformation and tightly cover the curved tube section 111.

[0068] It should be noted that the above materials can be reasonably selected according to actual needs.

[0069] Based on any of the above embodiments, in a further solution, the pipe sleeve 120 is provided with an elastic layer on the inner surface thereof which is sleeved with the curved pipe section 111. The elastic layer is a material layer made of an elastic material. The elastic layer is pre-arranged before the pipe sleeve 120 and the curved pipe section 111 are sleeved. In this way, when the pipe sleeve 120 and the curved pipe section 111 are sleeved and the two are squeezed and deformed against each other, the elastic layer between the pipe sleeve 120 and the curved pipe section 111 can provide a certain degree of structural protection to the curved pipe section 111.

[0070] Furthermore, in one embodiment, the constraint structure also includes a colloid, which is applied to the inner surface of the pipe sleeve 120 before the pipe sleeve 120 and the curved pipe section 111 are sleeved, and solidified when the pipe sleeve 120 and the curved pipe section 111 are sleeved to form an elastic layer. The colloid is generally in a liquid or semi-solid state before solidification. When the colloid is pre-coated before the pipe sleeve 120 and the curved pipe section 111 are sleeved, it can play a certain lubricating role in the sleeved process of the pipe sleeve 120 and the curved pipe section 111, and the sleeved action of the pipe sleeve 120 and the curved pipe section 111 can be used to achieve uniform spreading of the colloid. After the colloid is solidified, on the one hand, the solidified colloid can bond and fix the pipe sleeve 120 and the curved pipe section 111 to increase the interference effect between the two; on the other hand, when the solidified colloid has a certain elasticity, the solidified colloid also constitutes the above-mentioned elastic layer, which can play the structural protection purpose as described above.

[0071] In addition, based on the above schemes regarding setting conditions, in one embodiment, at least the inner surface of the sleeve 120 is provided with a recessed portion 122. When the setting condition is triggered, the sleeve 120 and at least a portion of the curved pipe section 111 are mutually compressed, so as to form a convex portion 112 filled in the recessed portion 122 on the outer surface of the curved pipe section 111. In this way, when the sleeve 120 and the curved pipe section 111 are mutually compressed, the portion of the curved pipe section 111 corresponding to the recessed portion 122 will be squeezed into the recessed portion 122 to form the convex portion 112, which is equivalent to forming a radial concave-convex connection at the sleeve joint of the sleeve 120 and the curved pipe section 111, which can effectively limit the axial displacement and deformation of the sleeve 120 and the curved pipe section 111.

[0072] Of course, according to actual needs, at least two recesses 122 are arranged at intervals along the length direction of the sleeve 120, and at least two protrusions 112 are formed for each recess 122. Multiple recesses 122 and protrusions 112 are arranged in a matching manner, which helps to enhance the axial limiting effect.

[0073] In addition, similarly to the above-mentioned arrangement of an elastic layer on the inner surface of the sleeve 120, an elastic layer may also be arranged on at least the inner surface of the recess 122 of the sleeve 120; and / or the inner surface of the recess 122 may be in the shape of an arc surface. In this case, the elastic layer arranged at the recess 122 may also provide structural protection for the convex portion 112 when the curved pipe section 111 is squeezed into the recess 122, and the inner surface of the recess 122 in the shape of an arc surface may similarly avoid forming a sharp structure to pierce the convex portion 112.

[0074] When the outer wall of the sleeve 120 is provided with the clearance holes 121 as described above, one or more of the clearance holes 121 can directly constitute the above-mentioned recessed portion 122. Of course, the recessed portion 122 can also be configured as other groove-shaped structures or hole-shaped structures different from the clearance holes 121, without limitation.

[0075] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A tube body with a partially maintained bending shape, applied to an endoscope, characterized in that: include: A tube body, which is used to be assembled on an operating body of an endoscope, and after assembly, a local bend of the tube body forms a bent tube segment; as well as, The pipe sleeve is suitable for the shape of the curved pipe section and extends in an arc shape, and is fixedly sleeved on the outer side of the curved pipe section. The pipe sleeve is made of a hard metal material.

2. The pipe body with a partially maintained bending shape as claimed in claim 1, characterized in that: The sleeve is provided with a clearance hole along its thickness direction, and the clearance hole is used to make way during the processing of the sleeve to form an arc shape, wherein: The clearance hole extends in an elongated shape along the circumference of the sleeve; and / or, A plurality of the clearance holes are arranged at intervals along the axial direction of the sleeve.

3. The pipe body with a partially maintained curved shape as claimed in claim 2, characterized in that: The clearance hole has two first side walls which are arranged opposite to each other in the circumferential direction of the sleeve, and two second side walls which are connected between the two first side walls; The first side wall is arranged in an arc shape.

4. The pipe body with a partially maintained curved shape as claimed in claim 2, characterized in that: The clearance hole has two first side walls which are arranged opposite to each other in the circumferential direction of the sleeve, and two second side walls which are connected between the two first side walls; After the sleeve is formed into an arc shape, the two second side walls are spaced apart in the axial direction of the sleeve.

5. The pipe body with a partially maintained bending shape according to any one of claims 1 to 4, characterized in that: The sleeve is provided with a recessed portion along the thickness direction thereof; The pipe body is made of a material that can be triggered to deform under set conditions. When triggered under the set conditions, the pipe sleeve and at least part of the curved pipe section are squeezed against each other to form a convex portion filled in the concave portion on the outer surface of the curved pipe section.

6. The pipe body with a partially maintained curved shape as claimed in claim 5, characterized in that: At least two of the concave portions are arranged at intervals along the length direction of the sleeve, and at least two of the convex portions are formed on each of the concave portions.

7. The pipe body with a partially maintained curved shape as claimed in claim 5, characterized in that: The tube body is made of a polyether block polyamide material, and the polyether block polyamide material expands and deforms under the stimulation of alcohol to form the convex portion; and / or, The sleeve is provided with a clearance hole along the thickness direction thereof, and the clearance hole constitutes the recess.

8. The pipe body with a partially maintained curved shape as claimed in claim 5, characterized in that: The sleeve is provided with an elastic layer at least on the inner surface of the recess.

9. The pipe body with a partially maintained curved shape as claimed in claim 1, characterized in that: The pipe body capable of maintaining the bending shape of a local pipe segment further comprises a colloid, which is applied to the inner surface of the pipe sleeve before the sleeve and the bent pipe segment are sleeved together, and solidified when the sleeve and the bent pipe segment are sleeved together to form an elastic layer.

10. An endoscope, characterized in that: include: The operating body is formed with a mounting cavity and two mounting holes respectively disposed at one axial end and one side end of the mounting cavity; and The tube body with a maintainable bending shape of a local pipe section as described in any one of claims 1 to 9, wherein the tube main body movably enters from one of the mounting holes and movably exits from another of the mounting holes after passing through the mounting cavity, and the portion of the tube main body between the two mounting holes defines the formation of the bent tube section.

Images