A traction tube and an endoscope device

Abstract

The present invention discloses a traction tube for an endoscope device. The endoscope device includes a capsule endoscope. One end of the traction tube is connected to the capsule endoscope to control the position of the capsule endoscope in the digestive tract of the subject to be examined. The traction tube at least includes a degradable part, and the degradable part can be degraded in the digestive tract of the subject to be examined. The present invention also discloses an endoscope, which includes a capsule endoscope, an operating mechanism and the above-mentioned traction tube. In the present invention, the traction tube is composed of a degradable part that can be degraded in the digestive tract of the subject to be examined, so that the endoscope device does not need to be recovered after use, and can be swallowed by the subject to be examined, greatly reducing the pain of the subject to be examined; it is for single use only, avoiding cross-infection. By adding through holes on the traction tube, the degradation rate of the traction tube is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular, to a traction tube and an endoscope device using the traction tube. Background Art

[0002] With the continuous development of medical technology, the application scope of endoscopes is becoming wider and wider. An endoscope can enter the digestive tract of a person to be examined to obtain an image of the part to be examined, and then determine whether there is a lesion in the part to be examined.

[0003] Since the endoscope needs to be inserted into the body of the person to be examined, during the detection process, the person to be examined may feel uncomfortable. To relieve this symptom, a capsule endoscope with a smaller size has emerged. Taking esophageal detection as an example, the person to be examined can swallow the capsule endoscope, so that the capsule endoscope enters the esophagus and slowly moves along the esophagus to obtain an image inside the esophagus.

[0004] However, the above-mentioned capsule endoscope usually stays in the body of the person to be examined for a short time, which results in incomplete images obtained by the capsule endoscope. To avoid problems such as missed detection, a traction tube can be connected to the capsule endoscope to control the retention time of the capsule endoscope in the digestive tract. However, after this solution is used, the traction tube needs to be pulled out from the esophagus, which not only brings great pain to the patient, but also increases the operation difficulty for the doctor. In addition, the traction tube may be used by multiple people. If the disinfection is insufficient, cross-infection is likely to occur. Summary of the Invention

[0005] The purpose of the present invention is to provide a traction tube that does not need to be recycled after use and an endoscope device using the traction tube.

[0006] The present invention provides a traction tube for an endoscope device, the endoscope device including a capsule endoscope, characterized in that one end of the traction tube is connected to the capsule endoscope to control the position of the capsule endoscope; the traction tube at least includes a degradable part, and the degradable part can be degraded in the digestive tract of the person to be examined.

[0007] Further, the traction tube further includes a non-degradable part, and adjacent non-degradable parts are separated by the degradable part.

[0008] Further, both the degradable part and the non-degradable part are tubular structures, and the degradable part and the non-degradable part are alternately arranged to form the traction tube.

[0009] Further, the degradable part has a grid structure, and the non-degradable part is filled in the grid cavities of the grid structure of the degradable part.

[0010] Further, there is an adhesive layer between the degradable part and the non-degradable part, and the degradable part and the non-degradable part are connected through the adhesive layer.

[0011] Further, a clamping part is provided at the front end of the traction tube. The clamping part includes a capsule clamping cavity for installing the capsule endoscope. At least a part of the capsule endoscope is located in the capsule clamping cavity. The clamping part has a tendency to restore deformation to apply a contraction clamping force to the capsule endoscope.

[0012] Further, the tube body of the traction tube is a hollow and airtight tubular structure.

[0013] Further, a sampling hole for sucking the digestive tract secretions is provided on the clamping part.

[0014] Further, a plurality of through holes are provided on the tube wall of the degradable part.

[0015] Further, the degradable part includes at least one of poly(lactic-co-glycolic acid) or poly(L-lactic acid).

[0016] Further, by mass, the ratio of poly(lactic-co-glycolic acid) to poly(L-lactic acid) is 4:1 to 1:4.

[0017] The present invention also provides an endoscope device, including the above-mentioned traction tube, a pressure control device, and a capsule endoscope. The traction tube connects the functional unit and the capsule endoscope, and the pressure control device controls the pressure environment inside the traction tube.

[0018] The traction tube provided by the present invention is composed of a degradable part that can be degraded in the digestive tract of the subject. After the endoscope device is used, the degradable part degrades in the subject's body, causing the traction tube to disintegrate. Therefore, there is no need for recovery or removal from the subject's mouth, greatly improving the comfort of the subject, facilitating single-use, and effectively avoiding the risk of cross-infection due to repeated use. By adding through holes to the traction tube, the degradation rate of the traction tube is further increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic cross-sectional structure diagram of the traction tube and the capsule endoscope of the present invention;

[0020] Figure 2 is a schematic structure diagram of the traction tube with through holes of the present invention;

[0021] Figure 3 is a schematic structure diagram of the traction tube in which both the degradable part and the non-degradable part are tubular of the present invention;

[0022] Figure 4 is Figure 3Partial enlarged schematic diagram of A;

[0023] Figure 5 Schematic diagram of the structure of the degradable part of the traction tube of the present invention being a net structure;

[0024] Figure 6 is Figure 5 Partial enlarged schematic diagram of B in;

[0025] Figure 7 Schematic diagram of the capsule endoscope of the present invention;

[0026] Figure 8 Schematic diagram of the structure of the endoscope device of the present invention;

[0027] Figure 9 Schematic diagram of the traction tube of the present invention including a sampling hole. Detailed implementation manners

[0028] The following will further describe in detail the specific implementation manners of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0029] The first embodiment

[0030] Please refer to Figure 1 As shown, the first embodiment of the present invention provides a traction tube 20, which is applied to an endoscope device. One end of the traction tube 20 is a free end, and the other end of the traction tube 20 is connected to the capsule endoscope 10 in the endoscope device. Specifically, in this embodiment, the connection between the traction tube 20 and the capsule endoscope 10 can be achieved either through a degradable adhesive or by tying the traction tube 20 to a connection structure such as a connection ring of the capsule endoscope, which will not be elaborated here. Among them, the traction tube 20 at least includes a degradable part 23, and the degradable part 23 can be degraded in the digestive tract of the subject.

[0031] In this embodiment, the traction tube 20 is entirely composed of the degradable part 23. Among them, the material of the degradable part 23 includes, for example, at least one of PLGA (poly(lactic - co - glycolic) acid, poly lactic acid - glycolic acid copolymer) and PLLA (poly - L - lactic acid, poly - L - lactic acid). Both PLGA and PLLA are biodegradable polymer materials, non - toxic, non - irritating and have good processability. PLLA has high strength and strong plasticity, however, its degradation time is very long. Therefore, in order to improve the degradation rate of the traction tube 20 and control the degradation time of the traction tube 20, in a preferred embodiment, PLGA with a shorter degradation time is added to PLLA.

[0032] This embodiment also provides a method for preparing the traction tube 20, which includes the following steps: S1. Blend the PLGA and PLLA raw materials in a preset ratio and heat them to melt to obtain a molten liquid; S2. Obtain the original tube through an extrusion or injection molding process, whereby the degradable traction tube 20 is obtained. Among them, the ratio of PLGA to PLLA can be adjusted as needed, and the present invention does not limit the specific ratio. For example, the ratio of PLGA to PLLA by mass is 4:1 to 1:4, etc. Further, for example, it is 4:1 to 2:1, 2:1 to 1:1, 1:1 to 1:2, or 1:2 to 1:4. Specifically, compared with the traction tube 20 composed only of PLLA, when the ratio of PLGA to PLLA in the traction tube 20 is 1:4 to 4:1, its degradation rate is increased by about 20% to 80%. Among them, within the above ratio range of PLGA to PLLA, when the ratio of PLGA to PLLA is 4:1, the degradation rate of the traction tube 20 is the fastest.

[0033] In other embodiments, in addition to changing the ratio of PLGA and PLLA and adjusting the wall thickness of the traction tube 20, other degradable materials can be used to replace PLGA and PLLA to adjust the degradation rate of the traction tube 20, which will not be elaborated here.

[0034] The traction tube 20 provided in this embodiment is made of a biodegradable material, so that the endoscope device does not need to be recycled after use and can be swallowed by the examinee, greatly reducing the pain of the examinee. By using a mixture of PLGA and PLLA to prepare the traction tube 20, both the mechanical properties and the degradation rate are taken into account.

[0035] For the convenience of transportation, storage, and the swallowing operation of the examinee, in this embodiment, the traction tube 20 is, for example, a flexible tube. Specifically, the degradable part 23 is made of a flexible material. Therefore, after being truncated, the traction tube 20 can curl up and be swallowed by the examinee, increasing the contact between the digestive tract fluid and the traction tube 20, facilitating the degradation rate of the degradable part 23, and improving the comfort of the examinee.

[0036] Second Embodiment

[0037] Please refer to Figure 3As shown, the second embodiment is an improvement over the first embodiment. The main improvement lies in that, in this embodiment, the traction tube 20 includes a degradable portion 23 and a non-degradable portion 24. Adjacent non-degradable portions 24 are separated by the degradable portion 23. The degradable portion 23 can be degraded in the digestive tract of the subject, so that the traction tube 20 disintegrates, and the non-degradable portion 24 will be discharged from the digestive tract. Accordingly, by controlling the ratio of the non-degradable portion 24 to the degradable portion 23, that is, controlling the amount of the traction tube 20 that needs to be degraded, the degradation time of the traction tube 20 can be controlled. Among them, the disintegration of the traction tube 20 means that the degradable portion 23 degrades, resulting in the separation of the non-degradable portions 23 from each other, and the various parts of the traction tube 20 are disassembled.

[0038] Further, in this embodiment, the non-degradable portion 24 has adhesiveness, or both the degradable portion 23 and the non-degradable portion 24 have adhesiveness. Therefore, the two can be connected by adhesiveness, thereby improving the structural strength and toughness of the traction tube 20.

[0039] In this embodiment, referring to Figure 3 , both the degradable portion 23 and the non-degradable portion 24 are formed into a tubular structure, and the degradable portion 23 and the non-degradable portion 24 are alternately arranged to form the traction tube 20. The present application does not limit the number of the degradable portion 23 and the non-degradable portion 24 in the traction tube 20, as long as it is ensured that adjacent non-degradable portions 24 are separated by one degradable portion 23, or the traction tube 20 is composed of only one degradable portion 23 and one non-degradable portion 24. In this embodiment, in order to ensure the smooth surface of the traction tube 20, the outer diameter of the tubular non-degradable portion 24 is the same as the outer diameter of the tubular degradable portion 23.

[0040] Preferably, in order to facilitate the subject to discharge the non-degradable portion 24 from the body, in a specific embodiment, the number of non-degradable portions can be greater than 10. Specifically, at the same length, the more the number of non-degradable portions 24, the smaller the length dimension that can be selected, and the easier it is to be discharged from the human body to avoid remaining in the subject's body. It should be noted that the non-degradable portion 24 is preferably made of a material that is non-toxic, harmless and difficult to degrade to the human body.

[0041] For the consideration of improving the disintegration speed of the traction tube 20, in this embodiment, the proportion of the non-degradable portion 24 in the traction tube 20 can be increased, so as to reduce the total amount that needs to be degraded to reduce the disintegration time of the traction tube 20. In this embodiment, the disintegration of the traction tube 20 can also be accelerated by increasing the number of the degradable portion 23 and the non-degradable portion 24. On the premise that the total length of the traction tube 20 is certain, the more the number of the degradable portion 23, the shorter the length of each degradable portion 23, and the shorter the degradation time of each degradable portion 23, so that the disintegration efficiency of the traction tube 20 is improved.

[0042] To improve the structural strength of the traction tube 20 and avoid breakage at the connection between the degradable part 23 and the non-degradable part 24, in this embodiment, refer to Figure 4 As shown, a viscous layer 27 for connecting the two is provided between the non-degradable part 24 and the degradable part 23. The degradable part 23 and the non-degradable part 24 are connected through the viscous layer 27, and the viscous layer 27 makes the connection more firm. Among them, the material of the viscous layer 27 is a degradable medical adhesive, such as cyanoacrylate adhesive, and the degradable part 23 and the non-degradable part 24 are connected through the viscous layer 27.

[0043] For the above-mentioned traction tube 20, this embodiment also provides a preparation method for the traction tube 20, including the following steps: S1. Heat and melt the polyurethane raw material to obtain a molten liquid; S2. Obtain the non-degradable part 24 through an extrusion or injection molding process; S3. Bond a plurality of non-degradable parts 24 using cyanoacrylate adhesive to form the traction tube 20. The above preparation method is only one for preparing the traction tube in the present invention, and the present invention does not limit the method for preparing the traction tube.

[0044] In other embodiments, medical plastics such as silicone rubber and thermoplastic elastomer can be used instead of polyurethane, and the cyanoacrylate adhesive can also be replaced by other degradable medical adhesives. The degradation rate of the traction tube 20 can also be changed by adjusting the ratio of the degradable medical adhesive and the medical plastic. This embodiment is composed of the degradable part 23 that can be degraded in the digestive tract of the subject, so that the endoscope device does not need to be recycled after use and can be swallowed by the subject, greatly reducing the pain of the subject; it is for single use and avoids cross-infection.

[0045] Third Embodiment

[0046] Please refer to Figure 5 As shown, the main difference between the third embodiment of the present invention and the above embodiment is that the degradable part 23 has a grid structure, and the non-degradable part 24 is filled in the grid cavities of the grid structure of the degradable part 23'. Among them, the grid cavity is the mesh of the grid structure.

[0047] Specifically, in this embodiment, the degradable part with a grid-like structure constitutes the framework of the traction tube, and the non-degradable part 24 is filled in the grid-like structure, thus forming an overall pipeline. Accordingly, adjacent non-degradable parts 24 are separated by the grid framework of the grid structure. The shape of the grid structure can be a polygon (such as a triangle, rectangle, pentagon or hexagon, etc.), or it can also be a circle, ellipse or rounded polygon, etc. Among them, after the traction tube enters the digestive tract for a period of time, the degradable part 23 gradually degrades in the digestive tract fluid, so it can no longer fix the non-degradable part 24, resulting in the complete disintegration of the traction tube 20 in the digestive tract.

[0048] Preferably, in this embodiment, refer to Figure 6, the adhesive layer 27 is disposed in the grid cavity of the grid structure, specifically on the side of the grid cavity facing the non-degradable portion 24. In this embodiment, the towing tube 20 increases the connection area between the non-degradable portion 24 and the degradable portion 23, and is fixed by the adhesive layer 27, which can make the towing tube 20 more secure.

[0049] Fourth Embodiment

[0050] Please refer to Figure 1 and Figure 7 As shown, this embodiment is a further improvement on any one of the first, second, and third embodiments. The main improvement lies in that a clamping portion 21 is provided at the front end of the towing tube 20. The clamping portion 21 includes a capsule clamping cavity 22 for installing the capsule endoscope 10. At least a part of the capsule endoscope 10 is located in the capsule clamping cavity 22. The clamping portion 21 has a tendency to recover from deformation to apply a contraction clamping force to the capsule endoscope 10 to fix the capsule endoscope 10.

[0051] The capsule endoscope 10 includes an optically transparent cover 11, an illumination array 12, a lens 13, an image sensor 14, a microprocessor 15, a magnetic body 16, a battery 17, a radio frequency transceiver module 18, a transceiver antenna 19, and a housing 110. The optically transparent cover 11 and the housing 110 form an accommodation space, and the other components are arranged in this accommodation space. The illumination array 12 is used to adjust the image brightness. The lens 13, the image sensor 14, and the microprocessor 15 are used for imaging and image processing. The radio frequency transceiver module 18 and the transceiver antenna 19 are used for data transmission. The battery 17 serves as the power source when the capsule endoscope 10 is working. The magnetic body 16 can be a permanent magnet or a magnetic dipole. The magnetic body 16 is controlled by an external magnetic field to control the movement of the capsule endoscope 10.

[0052] Of course, in other embodiments, the various functional modules, the external dimensions, and the arrangement forms of the capsule endoscope 10 can be increased or decreased to cope with different detection sites and detection purposes.

[0053] During the use of the above endoscopic device, the capsule endoscope 10 together with the clamping portion 21 is swallowed by the subject. The other end of the towing tube 20 is outside the subject's body and is controlled by an operator to tow, so that the capsule endoscope 10 can accurately stay in the designated area in the subject's digestive tract. After the capsule endoscope 10 completes the inspection, the towing tube 20 is swallowed, and at the same time, acidic beverages such as lemon juice and vinegar can be taken to accelerate the degradation of the towing tube 20.

[0054] In this embodiment, the shape and size of the capsule clamping cavity 22 are not limited, as long as the interference fit between the clamping portion 21 and the capsule endoscope 10 can be achieved.

[0055] Fifth Embodiment

[0056] In view of the long degradation time of PLLA, in order to control the disintegration rate of the traction tube 20, in the fifth embodiment, refer to Figure 2 As shown, a plurality of through holes 25 are arranged on the tube wall of the traction tube 20. The through holes 25 increase the contact area between the degradation part 23 and the liquid in the digestive tract (especially acidic liquid), and reduce the total amount of the traction tube to be decomposed, thereby accelerating the degradation of the degradation part 23 and helping the traction tube 20 to disintegrate in the digestive tract of the subject.

[0057] In this embodiment, the preparation method of the traction tube 20 with through holes 25 includes the following steps: S1. Heat and melt the raw material containing PLLA to obtain a molten liquid; S2. Obtain the original tube by extrusion or injection molding process; S3. Laser engrave through holes 25 on the original tube to obtain the traction tube 20 with through holes 25. Among them, the raw material in step S1 can also be a blend of PLLA and PLGA in a preset ratio, and the preset ratio can refer to the above text and will not be elaborated here.

[0058] In another embodiment, the preparation method of the traction tube 20 with through holes includes the following steps: S1. Blend the PLLA raw material and the pore-forming agent sodium chloride; S2. Dissolve the mixed material in chloroform and stir evenly at room temperature to obtain a mixed solution; S3. Pour the mixed solution into a tubular mold and vacuum dry to obtain the original tube; S4. Wash the original tube under pure water to obtain the traction tube with through holes.

[0059] Specifically, the pore-forming agent can be a substance that is soluble in water but insoluble in chloroform and harmless to the human body (such as sodium chloride, potassium chloride, etc.). The ratio of PLLA to the pore-forming agent can be adjusted according to the number of through holes 25. For example, the ratio of PLLA to the pore-forming agent by mass is 2:8 to 5:5, further 2:8 to 3:7, 3:7 to 4:6 or 4:6 to 5:5, etc. The present application does not further limit this ratio, as long as the traction tube 20 with through holes can be prepared and the structural strength of the traction tube 20 can be ensured. This preparation method omits the process of laser engraving through holes and effectively improves the manufacturing efficiency.

[0060] Sixth embodiment

[0061] Please refer to Figure 8 Figure 9, the sixth embodiment of the present invention provides an endoscope device, including a pressure control device 30, a capsule endoscope 10, and a traction tube 20 according to any one of the first to fourth embodiments. The traction tube 20 connects the pressure control device 30 and the capsule endoscope 10, and the pressure control device 30 controls the pressure environment inside the traction tube 20. Specifically, the pressure control device 30 is connected to the rear end of the traction tube 20 and is located outside the subject's body during use to provide positive pressure or negative pressure to the traction tube 20.

[0062] Specifically, when the pressure control device 30 provides positive pressure, the pressure control device 30 can be an inflation device. By inflating the traction tube 20, the pressure inside the tube increases. For example, the clamping force between the clamping portion 21 and the capsule endoscope 10 is reduced, so that the capsule endoscope 10 is separated from the traction tube 20, and the capsule endoscope 10 further performs image acquisition.

[0063] Please refer to Figure 9 , a sampling hole 26 is provided on the clamping portion 21, and the digestive juice in the subject's digestive tract can flow through the sampling hole 26 and through the traction tube 20 to be stored by the pressure control device 30. For example, samples of the subject's gastric juice, pancreatic juice, etc. can be taken.

[0064] To achieve the above object, the tube body of the traction tube 20 is a hollow and airtight tubular structure to ensure that the pressure control device 30 has sufficient negative pressure and the sampling position is accurate enough not to be contaminated by other digestive juices. Herein, the tube body of the traction tube 20 can be understood as the tubular structure of the traction tube 20 except for the clamping portion 21.

[0065] Accordingly, when the pressure control device 30 provides negative pressure, gas can be drawn out of the traction tube 20 to form a negative pressure, and the liquid at the sampling position can enter the traction tube 20 through the sampling hole 26 and then be collected by the collection device.

[0066] The endoscope device provided in this embodiment and the manufacturing method of the traction tube 20 enable the endoscope device to not only obtain the image information of the subject's digestive tract through the capsule endoscope 10, but also realize functions such as digestive juice sampling, helping doctors better judge the condition of the subject.

[0067] In the drawings, for clarity, the dimensions and relative dimensions of layers and regions are exaggerated. It should be understood that when an element such as a layer, region, or substrate is referred to as "formed on", "disposed on", or "located on" another element, the element can be directly disposed on the said another element, or there can also be an intermediate element. On the contrary, when an element is referred to as "directly formed on" or "directly disposed on" another element, there is no intermediate element.

[0068] In this article, unless otherwise specified, the meaning of "a plurality of" and "several" is two or more.

[0069] In this text, the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the sake of clarity in expressing the technical solution and convenience in description. Therefore, they should not be construed as limitations on the present invention.

[0070] In this text, unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0071] In this text, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion. In addition to the elements listed, it may also include other elements not expressly listed.

[0072] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity in description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0073] As described above, this is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claimed rights.

Claims

1. A traction tube for an endoscopic device, the endoscopic device including a capsule endoscope, characterized in that, One end of the traction tube is connected to the capsule endoscope to control the position of the capsule endoscope; the traction tube at least includes a degradable part, and the degradable part can be degraded in the digestive tract of the subject; the traction tube further includes a non-degradable part, and adjacent non-degradable parts are separated by the degradable part, and both the degradable part and the non-degradable part are tubular structures; there is an adhesive layer between the degradable part and the non-degradable part, and the degradable part and the non-degradable part are connected through the adhesive layer; a clamping part is provided at the front end of the traction tube, and the clamping part includes a capsule clamping cavity for installing the capsule endoscope, and at least a part of the capsule endoscope is located in the capsule clamping cavity, and the clamping part has a tendency to recover deformation to apply a contraction clamping force to the capsule endoscope.

2. The pulling pipe according to claim 1, characterized in that, The degradable part and the non-degradable part are alternately arranged to form the traction tube.

3. The pulling pipe according to claim 1, characterized in that, The degradable part has a grid structure, and the non-degradable part is filled in the grid cavity of the grid structure of the degradable part.

4. The pulling pipe according to claim 1, characterized in that, The tube body of the traction tube is a tubular structure that is internally hollow and airtight.

5. The pulling pipe according to claim 4, characterized in that, Sampling holes for sucking the secretions in the digestive tract are provided on the clamping part.

6. The pulling pipe according to claim 1, characterized in that, A plurality of through holes are provided on the tube wall of the degradable part.

7. The pulling pipe according to claim 1, wherein, The degradable part includes at least one of poly(lactic-co-glycolic acid) or poly(L-lactic acid).

8. The pulling pipe according to claim 7, wherein By mass, the ratio of poly(lactic-co-glycolic acid) to poly(L-lactic acid) is 4:1 to 1:

4.

9. An endoscope device, comprising a traction tube as described in any one of claims 1-8, a pressure control device, and a capsule endoscope, the traction tube is connected to the pressure control device and the capsule endoscope, and the pressure control device controls the pressure environment in the traction tube.

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