Endoscope

Abstract

Provided is an endoscope capable of improving the assembly operability when assembling various pipelines in an insertion portion and facilitating maintenance. The endoscope comprises: an insertion portion (101); a handheld operation portion (102) connected to the insertion portion (101); a plurality of pipelines (121 to 124) arranged inside the insertion portion (101) and the handheld operation portion (102); a main board (211) as a fixing member fixedly provided relative to the handheld operation portion (102); and a relay portion (a first relay portion (201) and a second relay portion (202)) for relaying the plurality of pipelines. The relay portion has a structure capable of being fixed relative to the main board (211).

Description

Technical Field

[0001] The present invention relates to endoscopes. Background Art

[0002] An endoscope device generally includes an insertion portion that is inserted into a subject's body (eg, digestive organs). The insertion portion includes a light guide for transmitting light and electrical wiring for transmitting electrical signals from an imaging unit provided at a distal end.

[0003] In addition, the insertion section contains various conduits, including air and water supply lines for air and water delivery, suction lines for aspirating body fluids and resected material, and therapeutic instrument lines for inserting and removing therapeutic instruments. In endoscopes, it is crucial to connect these lines in a manner that prevents connection failures. Furthermore, ease of assembly is crucial for cost reduction and maintenance.

[0004] As a technology that facilitates the connection of various pipelines, improves assembly workability, and facilitates maintenance, the endoscope described in Patent Document 1 is known. In this endoscope, the water and air supply pipelines can be divided, and at the divided position, the front and rear pipelines are relayed (connected) via a relay member. The device of Patent Document 1 facilitates the piping and replacement of various pipelines, reducing costs and facilitating maintenance.

[0005] However, although the device of Patent Document 1 can divide the conduit, there is a problem that its operability is insufficient. In addition, since multiple conduits are present in the insertion portion, it is not easy to reliably connect the same type of conduits without causing connection errors.

[0006] Patent Document 1: Japanese Patent No. 3488170 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an endoscope capable of improving assembly workability when assembling various tubes in the endoscope and facilitating maintenance.

[0009] Means for solving problems

[0010] To solve the above-mentioned problems, the endoscope according to the present invention comprises: an insertion portion; a handheld operation portion connected to the insertion portion; a plurality of conduits disposed within the insertion portion and the handheld operation portion; a fixing member fixedly provided relative to the handheld operation portion; and a relay portion for relaying the plurality of conduits. The relay portion has a structure capable of being fixed relative to the fixing member.

[0011] Effects of the Invention

[0012] According to the endoscope of the present invention, it is possible to improve the assembling workability when assembling various conduits in the insertion portion and to facilitate maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an external perspective view of the endoscope system 1 according to the first embodiment of the present invention.

[0014] Figure 2 This is a perspective view illustrating the internal structure of the distal end portion of the endoscope 100 .

[0015] Figure 3 It is a plan view for explaining the structure of the relay portion of the pipes 121 to 124 .

[0016] Figure 4 It is a cross-sectional view for explaining the structure of the relay portion of the pipes 121 to 124 .

[0017] Figure 5 This is a perspective view illustrating the structure of the relay portion of the pipes 121 to 124 .

[0018] Figure 6 This is a perspective view illustrating the steps of assembling the relay unit.

[0019] Figure 7 This is a perspective view illustrating the steps of assembling the relay unit.

[0020] Figure 8 This is a perspective view illustrating the steps of assembling the relay unit.

[0021] Figure 9 It is a perspective view illustrating the configuration of an endoscope system 1 according to a second embodiment of the present invention.

[0022] Figure 10 It is a perspective view illustrating the configuration of an endoscope system 1 according to a third embodiment of the present invention.

[0023] Figure 11 It is a perspective view illustrating the configuration of an endoscope system 1 according to a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present embodiment is described below with reference to the accompanying drawings. In the accompanying drawings, functionally identical elements are sometimes denoted by the same reference numerals. Furthermore, the accompanying drawings illustrate embodiments and installation examples based on the principles of the present disclosure. These are provided for understanding the present disclosure and are not intended to limit the present disclosure in any way. The descriptions in this specification are merely exemplary and do not in any way limit the scope of the claims or application examples of the present disclosure.

[0025] In this embodiment, it should be understood that although the present disclosure is described in sufficient detail for those skilled in the art to implement the present disclosure, other installations / methods are possible, and changes in the configuration / structure and replacement of various elements are possible without departing from the scope and spirit of the technical concept of the present disclosure. Therefore, the following description is not to be interpreted as limiting.

[0026] [First embodiment]

[0027] First, an endoscope system according to an embodiment of the present invention will be described in detail. Figure 1 is a perspective view of the appearance of the endoscope system 1 according to the first embodiment. Figure 2 1 is a perspective view showing the internal structure of the distal end portion of the endoscope 100. The endoscope system 1 is roughly composed of the endoscope 100, a processor 200, a light source device 300, a water and air supply unit 400, a suction unit 500, a display 600, and an input unit 700.

[0028] The endoscope 100 is configured to be inserted into a subject's body, to image the subject, and to transmit image signals of the captured images to the processor 200. The processor 200 receives the image signals from the endoscope 100 and performs predetermined signal processing.

[0029] The light source device 300 is configured to be connectable to the processor 200 and internally includes a light source for generating light for illuminating the subject. Light from the light source is directed toward the subject via a light guide, described later. The light source device 300 may be configured independently of and connectable to the processor 200, or may be incorporated into the processor 200.

[0030] The water and air supply unit 400 includes an air pump and a water flow pump (not shown) for releasing water or air flow to the subject. The suction unit 500 includes a pump and a tank (not shown) for sucking body fluids and resected material from the subject's body through the insertion unit 101.

[0031] The display 600 is a display device for displaying, for example, the results of data processing by the processor 200. The input unit 700 is a device for inputting instructions from an operator in various measurement operations.

[0032] The endoscope 100 includes an insertion portion 101 , a handheld operation portion 102 , a bending portion 103 , a distal end portion 104 , a universal cable 105 , and a connector portion 106 .

[0033] like Figure 1As shown, the endoscope 100 is flexible and includes an insertion portion 101 for insertion into a subject's body. One end of the insertion portion 101 is connected to a handheld operating unit 102. The handheld operating unit 102 includes, for example, a bending operation knob 102A and an operating unit operable by a user, and is used by the operator to perform various operations for imaging using the endoscope system 1.

[0034] A bending portion 103 configured to bend is provided at the front end of the insertion portion 101. The bending portion 103 is bent by pulling an operating wire (not shown) linked to the rotation operation of the bending operation knob 102A provided on the handheld operation portion 102. In addition, a front end portion 104 having a photographing element (photographing portion) is connected to the front end of the bending portion 103. The orientation of the front end portion 104 changes according to the bending action of the bending portion 103 generated by the rotation operation of the bending operation knob 102A, thereby changing the photographic area based on the endoscope 100. The universal cable 105 extends from the opposite side of the handheld operation portion 102 toward the connector portion 106. Similar to the insertion portion 101, the universal cable 105 includes a light guide, various wirings, and various pipes therein.

[0035] The connector section 106 includes various connectors for connecting the endoscope 100 to the processor 200. The connector section 106 also includes a water and air supply tube 108, which serves as a path for conveying water and air from the water and air supply section 400 toward the insertion section 101, and a suction tube 109, which is used to introduce body fluids and resected material aspirated from the subject's body into the suction section 500.

[0036] Reference Figure 2 , the internal structure of the endoscope 100 is described. Figure 2 This is a perspective view showing an enlarged partial structure of the distal end portion 104 of the endoscope 100 .

[0037] Inside the endoscope 100, a light guide 111 extends from the distal end portion 104 to the connector portion 106. Light from the light source of the light source device 300 is guided by the light guide 111 and condensed by a condenser lens 112 disposed at the distal end thereof to be irradiated toward the subject.

[0038] The endoscope 100 also includes an objective lens 113 and an imaging element 114 at the distal end portion 104 . The objective lens 113 focuses scattered light and reflected light from the subject, and forms an image of the subject on the light receiving surface of the imaging element 114 .

[0039] As an example, the imaging element 114 can be formed of a Complimentary Metal Oxide Semiconductor Sensor (CMOS sensor). The imaging element 114 is controlled by signals (such as a gain control signal, an exposure control signal, and a shutter speed control signal) supplied from the processor 200 via the electrical wiring 115. The imaging element 114 also supplies an image signal of the captured image to the processor 200 via the electrical wiring 115 and an A / D conversion circuit (not shown).

[0040] Furthermore, the end surface of the distal end portion 104 of the endoscope 100 is provided with a water supply port 116, an air supply port 117, a secondary water supply port 118, and a suction port 119, serving as the ends or openings of various conduits. The water supply port 116 is connected to a water supply conduit 121 for introducing water from the water and air supply unit 400 for cleaning the distal end portion 104, etc. The air supply port 117 is connected to an air supply conduit 122 for introducing air from the water and air supply unit 400. The secondary water supply port 118 is connected to a secondary water supply conduit 123 for introducing secondary water from the water and air supply unit 400 for cleaning liquid, staining liquid, etc. for removing contaminants from the field of view. Furthermore, the suction port 119 is connected to a suction conduit 124 for introducing body fluids and resected material aspirated from the subject's body into the suction unit 500. The conduits 121 to 124 are arranged to extend along the distal end portion 104 , the bending portion 103 , the insertion portion 101 , the handheld operation portion 102 , and the interior of the universal cord 105 .

[0041] In addition to these conduits 121-124, treatment tool conduits 127 and 128 are also provided within the endoscope 100. These conduits 127 and 128 allow for the flexible advancement and retraction of treatment tools such as forceps. The distal ends of the treatment tool conduits 127 and 128 define treatment tool openings 120A and 120B in the distal end portion 104.

[0042] The aforementioned conduits 121 to 124 are divided near the connection between the handheld operating unit 102 and the insertion unit 101. The conduits before and after the division are relayed (connected) by relay units (a first relay unit 201 and a second relay unit 202). In this embodiment, the following configuration is provided to facilitate the connection operation using the relay units.

[0043] Reference Figures 3 to 5 , the structure of the relay portion of the pipelines 121 to 124 will be described. Figure 3 This is a top view of the vicinity of the relay unit. Figure 4 yes Figure 3 AA cross-sectional view, Figure 5 It is a perspective view of the vicinity of the relay unit.

[0044] like Figure 3As shown, the water supply line 121, the air supply line 122, the auxiliary water supply line 123, and the suction line 124 extend within the insertion portion 101 along the longitudinal direction of the insertion portion 101. Meanwhile, the water supply line 121A, the air supply line 122A, the auxiliary water supply line 123A, and the suction line 124A extend within the universal cable 105 and the handheld operation unit 102. The water supply line 121, the air supply line 122, the auxiliary water supply line 123, and the suction line 124 are relayed (connected) to the water supply line 121A, the air supply line 122A, the auxiliary water supply line 123A, and the suction line 124A by the first relay unit 201 and the second relay unit 202.

[0045] The handheld operation unit 102 is provided with a main plate 211 as a fixed member. The main plate 211 is a plate-shaped member fixed to the housing of the handheld operation unit 102 and extends toward the insertion unit 101. The first relay unit 201 and the second relay unit 202 are fixedly attached to the main plate 211.

[0046] Reference Figure 4 , the structure of the relay unit (the first relay unit 201 and the second relay unit 202) will be described. The relay unit in the illustrated example includes the first relay unit 201 and the second relay unit 202. In addition, the first relay unit 201 and the second relay unit 202 are configured to be directly or indirectly mounted on the main board 211.

[0047] Figure 4 In the example, the second relay part 202 has a structure that can be fixed relative to the main board 211 by screws 212, and on the other hand, the first relay part 201 has a structure that can be fixed relative to the second relay part 202 by screws 203. Thus, the first relay part 201 and the second relay part 202 are fixedly arranged relative to the main board 211. However, the structure shown in the figure is only an example after all, and the fixing method is arbitrary as long as the relay part can be fixedly arranged relative to the main board 211. For example, the first relay part 201 and the second relay part 202 can also adopt a structure that is directly fixed to the main board 211. In addition, the upper and lower relationship of the first relay part 201 and the second relay part 202 can also be reversed. In addition, the number of relay parts is not limited to two, and can be three or more.

[0048] The main board 211 is also an example of a fixing member for fixing the first relay unit 201 and the second relay unit 202, and is not limited thereto. The first relay unit 201 and the second relay unit 202 can be connected to a fixing member that is not movable relative to the handheld operation unit 102, and the details of the method are arbitrary.

[0049] like Figure 3 as well as Figure 5 As shown, the first relay unit 201 is configured such that the water supply line 121, the air supply line 122, and the auxiliary water supply line 123 are connected on one side, and the water supply line 121A, the air supply line 122A, and the auxiliary water supply line 123A are connected on the other side. Figure 4 As shown, the first relay section 201 has holes H1-H3 extending from the front side to the back side. Relay pipes CP1-CP3 can be inserted and secured in these holes H1-H3. Relay pipes CP1-CP3 extend from one side of the first relay section 201 to the other side. Pipes 121-123 are secured to one end of these pipes CP1-CP3 via pipe stoppers CL1-CL3. Furthermore, pipes 121A-123A are secured to the other ends of these pipes CP1-CP3 via pipe stoppers CLA1-CLA3.

[0050] like Figure 3 as well as Figure 5 As shown, the second relay section 202 is configured to have the suction line 124 connected to one side and the suction line 124A connected to the other side. Figure 4 As shown, the second relay section 202 has a hole H4 extending from the front side to the back side, and a relay tube CP4 can be inserted and fixed in this hole H4. The suction line 124 is fixed to one end of the relay tube CP4 by a tube stopper CL4. Furthermore, the suction line 124A is fixed to the other end of the relay tube CP4 by a tube stopper CLA4.

[0051] In addition, Figures 3 to 5 In the example shown, the first relay portion 201 has a shape in which the holes H1 to H3 are arranged in a direction substantially parallel to the plate surface of the main plate 211, but this shape is an example and is not limited thereto. Figures 3 to 5 In the illustrated example, the width of the first relay portion 201 in the transverse direction (a direction intersecting the longitudinal direction of the insertion portion 101) is greater than the width of the second relay portion 202 in the transverse direction. This creates a space SP1 between the first relay portion 201 and the main plate 211. For example, the treatment instrument conduit 127 can be disposed in this space SP1. By sandwiching the treatment instrument conduit 127 between the first relay portion 201 and the main plate 211 in the space SP1, the treatment instrument conduit 127 can be stably positioned within the insertion portion 101, thereby facilitating efficient assembly.

[0052] Reference Figures 6 to 8 , the steps of assembling the first relay unit 201 and the second relay unit 202 are described. Figure 6 As shown, in this embodiment, the second relay portion 202 is fixed to the main board 211 by screws 212 , and the first relay portion 201 is fixed to the second relay portion 202 by screws 203 .

[0053] Before the second relay portion 202 is screwed and fixed to the main board 211, Figure 7 As shown, the relay pipe CP4 is inserted and fixed in the hole H4, and the pipeline 124A is connected to the other end side of the relay pipe CP4 via the pipe stopper CLA4. Thereafter, the second relay part 202 is fixed by the screw 212.

[0054] Similarly, before the first relay portion 201 is screwed and fixed to the second relay portion 202, Figure 8 As shown, relay pipes CP1 to CP3 are inserted and fixed in the holes H1 to H3, and the other ends of the relay pipes CP1 to CP3 are connected to the pipe lines 121A to 123A via the pipe stoppers CLA1 to CLA3.

[0055] Thereafter, the first intermediary portion 201 inserts the screw 203 into the screw hole SH1, and screws the screw 203 into the screw hole SH2 of the second intermediary portion 202 (see FIG. Figure 6 Left). Subsequently, pipes 121-1234 are connected to one end of relay pipes CP1-3 via pipe stoppers CL1-CL3. At this point, first relay units 201 and 202 are already secured to main plate 211, so the operator can perform assembly work while holding only pipe stoppers CL1-CL4 and pipes 121-124.

[0056] As described above, according to the endoscope of this embodiment, the relay unit for connecting the pipeline has a structure that can be fixed to the fixing member fixed to the handheld operation unit 102. Therefore, the pipeline connection operation can be performed relative to the fixed relay unit. Therefore, the efficiency of the pipeline assembly operation can be improved. In addition, it is possible to suppress the application of excessive force to the pipeline during operation, and the risk of damage such as bending of the pipeline can be reduced. Moreover, when performing maintenance, the operation can also be performed by fixing the pipeline to be connected by the relay units 201 and 202, thereby achieving efficient maintenance work.

[0057] [Second embodiment]

[0058] Next, refer to Figure 9 The endoscope system 1 according to the second embodiment of the present invention will be described. The overall structure of the endoscope system 1 according to the second embodiment is similar to that of the first embodiment ( Figure 1 、 Figure 2 ) are the same, and therefore, repeated descriptions are omitted below. The second embodiment differs from the first embodiment in the details of the structure of the relay unit. Figure 9 (a) is a perspective view of the vicinity of the relay portion as viewed from the side of the tube stoppers CLA1 to CLA3. Figure 9 (b) is a perspective view of the vicinity of the relay portion as viewed from the relay pipes CP1 to CP3. Figure 9(c) is a perspective view of the second relay unit 202X. Figure 9 (d) is a perspective view showing the state where the relay unit is assembled.

[0059] In the second embodiment, Figure 9 As shown in (c), the second relay unit 202X and the main board 211X are integrated into one structure, which is different from the first embodiment. When assembling the endoscope system 1 of the second embodiment, as shown in FIG. Figure 9 As shown in (b), the relay pipe CP4 is inserted and fixed to the second relay section 202X integrally formed with the main plate 211X, and the other end of the relay pipe CP4 is connected to the pipeline 124A via the pipe stopper CLA4. Furthermore, as in the first embodiment, before the first relay section 201 is screwed and fixed to the second relay section 202X, the relay pipes CP1 to CP3 are inserted and fixed to the holes H1 to H3, and the other ends of the relay pipes CP1 to CP3 are connected to the pipelines 121A to 123A via the pipe stoppers CLA1 to CLA3.

[0060] Thereafter, the first intermediary portion 201 is fixed to the second intermediary portion 202X by inserting the screw 203 into the screw hole SH1 and screwing the screw 203 into the screw hole SH2 of the second intermediary portion 202. Figure 9 As shown in (d), one end of the relay pipes CP1 to CP4 is connected to the pipes 121 to 124 via the pipe stoppers CL1 to CL4. At this point, the first relay unit 201 is already fixed to the main plate 211 via the second relay unit 202X. Therefore, the operator can perform the assembly operation by holding only the pipe stoppers CL1 to CL4 and the pipes 121 to 124.

[0061] As described above, the second embodiment can achieve the same effects as the first embodiment. In the second embodiment, since the second relay unit 202X is integrally structured with the main board 201, the number of assembly steps can be reduced compared to the first embodiment.

[0062] [Third embodiment]

[0063] Next, refer to Figure 10 The endoscope system 1 according to the third embodiment of the present invention will be described. The overall structure of the endoscope system 1 according to the third embodiment is similar to that of the first embodiment ( Figure 1 、 Figure 2 ) are the same, and therefore, repeated descriptions are omitted below. The third embodiment differs from the first embodiment in the details of the structure of the relay unit. Figure 10 (a) is a perspective view of the vicinity of the relay portion as viewed from the side of the tube stoppers CLA1 to CLA3. Figure 10 (b) is a perspective view of the vicinity of the relay portion as viewed from the relay pipes CP1 to CP3. Figure 10 (c) is a perspective view of the relay unit 201X. Figure 10 (d) is a perspective view showing the state where the relay unit is assembled.

[0064] In the third embodiment, Figure 10 As shown in (c), the relay portion 201X is configured to be fixed to the main plate 211 by direct screw fastening. In other words, the relay portion 201X has a shape in which the first relay portion 201 and the second relay portion 202 of the first embodiment are integrally configured.

[0065] In assembling the endoscope system 1 of the third embodiment, as shown in FIG. Figure 10 As shown in (b), the relay pipes CP1 to CP4 are inserted and fixed to the relay unit 201X, and the pipes 121A to 124A are connected to the other ends of the relay pipes CP1 to CP4 via the pipe stoppers CLA1 to CLA4. Thereafter, the relay unit 201X is fixed to the main board 211 by inserting the screw 203 into the screw hole SH5. Figure 10 As shown in (d), the pipes 121 to 124 are connected to one ends of the relay pipes CP1 to CP4 via the pipe stoppers CL1 to CL4.

[0066] As described above, according to the third embodiment, the same effects as those of the first embodiment can be obtained. In the third embodiment, the number of relays is small, and accordingly, the number of assembly steps can be reduced compared to the above-mentioned embodiments.

[0067] [Fourth embodiment]

[0068] Next, refer to Figure 11 The endoscope system 1 according to the fourth embodiment of the present invention will be described. The overall structure of the endoscope system 1 according to the fourth embodiment is similar to that of the first embodiment ( Figure 1 、 Figure 2 ) are the same, and therefore, repeated descriptions are omitted below. The fourth embodiment differs from the first embodiment in the details of the structure of the relay unit. Figure 11 (a) is a perspective view of the vicinity of the relay portion as viewed from the side of the tube stoppers CLA1 to CLA3. Figure 11 (b) is a perspective view of the vicinity of the relay portion as viewed from the relay pipes CP1 to CP3. Figure 11 (c) is a three-dimensional diagram of the relay unit 201XX. Figure 11 (d) is a perspective view showing the state where the relay unit is assembled.

[0069] In the fourth embodiment, Figure 11As shown in (c), similar to the relay unit 201X of the third embodiment, the relay unit 201XX is configured to be fixed to the main plate 211 by direct screw fastening. In other words, it has a shape that integrates the first relay unit 201 and the second relay unit 202 of the first embodiment. However, the insertion holes of the relay pipes CP1-4 of the relay unit 201XX are arranged parallel to the main plate 211. Other aspects are the same as those of the third embodiment.

[0070] [other]

[0071] The present invention is not limited to the above-described embodiments but also includes various variations. For example, the above-described embodiments are described in detail to facilitate understanding of the present invention and are not necessarily limited to all of the described configurations. Furthermore, a portion of the configuration of one embodiment can be replaced with a configuration of another embodiment, and a configuration of another embodiment can be added to a configuration of another embodiment. Furthermore, other configurations can be added, deleted, or substituted for a portion of the configuration of each embodiment.

[0072] Description of Reference Numerals

[0073] 1…Endoscope system; 100…Endoscope; 101…Insertion portion; 102…Handheld operation portion; 102A…Bending operation knob; 103…Bending portion; 104…Tip portion; 105…Universal cable; 106…Connector portion; 108…Water and air supply tubes; 109…Suction tube; 111…Light guide; 112…Converging lens; 113…Objective lens; 114…Image pickup element; 115…Electrical wiring; 116…Water supply port; 117…Air supply port; 118…Auxiliary water supply port; 119…Suction port; 120A, 120B…Treatment tool openings; 121…Water supply line; 121A…Water supply line; 122… Air supply line; 122A…air supply line; 123…auxiliary water supply line; 123A…auxiliary water supply line; 124…suction line; 124A…suction line; 127…treatment tool line; 128…treatment tool line; 200…processor; 201…first relay unit; 202, 202X…second relay unit; 201X, 201XX…relay unit; 203…screw; 211…main board; 212…screw; 300…light source device; 400…water and air supply unit; 500…suction unit; 600…display; 700…input unit; CP1~4…relay pipes; H1~4…hole unit; SP1…space.

Claims

1. An endoscope, characterized in that: have: Insertion; A handheld operating portion connected to the insertion portion; A plurality of pipelines are arranged inside the insertion portion and the handheld operation portion; a fixing member, fixedly arranged relative to the handheld operating part; as well as A relay unit relays the plurality of pipelines. The relay portion has a structure capable of being fixed relative to the fixing member, The relay unit includes: a first relay unit for relaying a first pipeline among the plurality of pipelines; as well as The second relay unit relays the second pipeline among the plurality of pipelines. The first relay portion is configured to be fixed to the second relay portion, and the second relay portion is configured to be fixed to the fixing member. The width of the first intermediary portion in a second direction intersecting a first direction which is the longitudinal direction of the insertion portion is greater than the width of the second intermediary portion in the second direction, and a space is provided between the first intermediary portion and the fixing member.

2. The endoscope according to claim 1, wherein The fixing member is a plate-shaped member extending from the handheld operation portion toward the insertion portion.

3. The endoscope according to claim 1, wherein The relay portion includes a relay tube extending from the first surface side to the second surface side of the relay portion. The first-side pipeline is connected to one end of the relay tube, and the second-side pipeline is connected to the other end of the relay tube.

Images