Perfusion and suction system

Abstract

The utility model provides a perfusion and suction system which comprises a guide sheath, the guide sheath comprises a handle and a sheath tube, the size and the shape of the sheath tube are suitable for entering a target area in a body through a body lumen, and the sheath tube longitudinally extends from a near end to a far end, a first tube cavity suitable for external instruments to enter is defined by the sheath tube, and an auxiliary tube cavity longitudinally extending from the near end to the far end is formed in the wall of the sheath tube. The handle comprises a handle body, a first connecting piece and a third connecting piece, the first connecting piece and the third connecting piece are arranged on the handle body, the first connecting piece is suitable for being connected with a negative pressure device so that liquid media in the body can be discharged out of the body through the liquid discharging path, and the third connecting piece is communicated with the auxiliary pipe cavity to form a liquid supplementing channel. The third connecting piece is configured to be suitable for being connected with external equipment so that liquid media can conveniently flow into the auxiliary pipe cavity and enter the body.

Description

TECHNICAL FIELD

[0001] The utility model belongs to medical treatment instrument, and specifically relates to a perfusion suction system. BACKGROUND

[0002] In a conventional ureteral flexible mirror lithotripsy operation, the powder of the calculus and the hematuria in the renal pelvis can cause the visual field to be blurred, and it is necessary to perfuse the flushing liquid to keep the visual field clear, but at the same time, the pressure in the renal pelvis can be obviously increased due to too fast perfusion and poor reflux, and the infected urine, bacteria and endotoxin enter the blood and lymph circulation, causing the patient to have fever and systemic inflammatory response syndrome after the operation, and even causing fatal urosepticemia. In order to prevent serious infection caused by too high pressure in the renal pelvis during the flexible mirror operation, it is necessary to control the pressure in the renal pelvis in a safe range during the operation, and it is further necessary to adjust the perfusion speed and / or the high and low values of the negative pressure suction according to the feedback of the pressure in the renal pelvis during the operation, and whether the pressure measuring method can measure the pressure in the renal pelvis in real time and accurately is the cornerstone to ensure that the pressure measuring and controlling system has good performance and safe operation.

[0003] The ureter pressure measuring sheath 10 is mainly used for establishing an operation channel for treatment when ureteral stenosis, adhesion, obstruction, blockage and calculus occur, and endoscopes 20, laser fibers, stone removal instruments or operation cables are introduced through the channel. At the same time, in order to keep the visual field clear during the existing urological operation, it is necessary to perfuse the flushing liquid, but the pressure in the renal pelvis can be obviously increased due to too fast perfusion and poor reflux, and in order to prevent a series of complications such as fever and renal pelvis rupture caused by changes in the pressure in the renal pelvis, it is necessary to control the pressure in the renal pelvis in a safe range during the operation.

[0004] The existing bendable pressure measuring sheath retains the pressure measuring lumen, the sensor and the pressure measuring control module are placed on the main control machine or the main control machine pipeline, then the pressure measuring lumen of the connecting pipeline and the pressure measuring sheath are connected, and then the pressure is transmitted to the sensor, however, the pressure measuring precision of the structure is greatly affected by the pipeline, the pressure measuring precision is poor, and the operation keys are divided on the main machine, which is not convenient for doctors to control and operate, and it is difficult to control the perfusion and suction process in the process of focusing on stone crushing and stone cleaning. In addition, some schemes also install the pressure sensor on the pressure measuring sheath or the endoscope, and the pressure measuring control module is on the main machine or the main machine pipeline, and the sensor and the pressure measuring control module are connected through a cable, the operability of this control structure is poor, and the pressure measuring precision cannot be completely guaranteed. SUMMARY

[0005] The present application provides a perfusion suction system, which comprises

[0006] A guide sheath comprising a handle and a sheath tube, the sheath tube being sized and shaped to pass through a body lumen to a target region within the body, and extending longitudinally from a proximal end to a distal end, the sheath tube defining a first lumen adapted for passage of an external instrument, and an auxiliary lumen formed within the sheath tube wall extending longitudinally from the proximal end toward the distal end;

[0007] The handle comprises a handle body defining a port in communication with the first lumen, the port being provided with a seal member including a passage therethrough, a medical instrument being sealably passed through the port into the first lumen, a first connector provided on the handle body, the first connector having a first passage in communication with the first lumen to constitute a drainage path, the first connector being adapted to be connected to a negative pressure device to cause a liquid medium within the body to be drained out of the body through the drainage path, and a third connector in communication with the auxiliary lumen to constitute a replenishment passage, the third connector being configured to be adapted to be connected to an external device to facilitate inflow of the liquid medium into the auxiliary lumen and into the body;

[0008] An endoscope sealably passed through the port of the handle body into the first lumen, a gap between the first lumen and the endoscope draining waste fluid within the body;

[0009] A perfusion device connected to the endoscope to deliver the liquid medium into the body through the endoscope catheter, the perfusion device pressurizing and expanding the patient's cavity with the liquid medium to form a visualized region, and cleaning the cavity of impurities, so that the physician can observe through the endoscope and the surgical field is clear;

[0010] A suction device connected to the first connector, the suction device providing negative pressure to the drainage path to suck waste fluid within the body out of the body;

[0011] A master control connected to the perfusion device and the suction device to control the operation state of the perfusion and the suction.

[0012] In some embodiments, a pressure measuring lumen is formed within the sheath tube wall extending longitudinally from the proximal end toward the distal end, the pressure measuring lumen being provided with a pressure measuring port at the distal end for sensing the pressure of the liquid within the body, the handle comprising a second connector provided on the handle body, the second connector having a second passage in communication with the pressure measuring lumen, a pressure sensor being provided on the pressure measuring lumen, the second passage or any path in communication therewith.

[0013] In some embodiments, the pressure measuring lumen, the first lumen and the auxiliary lumen are separately provided.

[0014] In some embodiments, a liquid outlet is provided at the bottom end of the first lumen, the first passage being located below the handle, and the axis of the first passage being perpendicular to the axis of the first lumen to constitute a straight drainage path.

[0015] In some embodiments, the sheath is sealingly connected with the handle body to form a calibration chamber in the handle body, the calibration chamber is in communication with the outside, the handle body port is provided with a seal to facilitate the endoscope or dilator sealingly passing through, the calibration chamber is provided with a PCB and a pressure sensor, the pressure sensor is a gauge pressure sensor, the gauge pressure sensor is positioned in the calibration chamber and at least its sensing diaphragm is arranged at the pressure measuring hole to collect the pressure in the pressure measuring tube cavity, and the second channel has an opening in communication with the outside, the opening can be opened or closed by a sealing part, and the calibration of the pressure sensor is realized by the opening and the calibration chamber.

[0016] In some embodiments, the guide sheath further comprises:

[0017] A PCB is mounted in the handle body, the PCB is connected with the pressure sensor, the PCB is provided with at least one data connector, the data connector extends out of the handle body, and the data connector is configured to be connected with the external perfusion and suction device to transmit signals;

[0018] An operation button is arranged on the handle body and connected with the PCB to control the running state of perfusion and suction.

[0019] In some embodiments, the first connector is arranged at the bottom of the handle body, the second connector and the third connector are arranged at the left side wall and the right side wall of the handle respectively, and the operation button is arranged at the upper part of the handle.

[0020] In some embodiments, the third connector has an interface, and the interface can be closed or opened by a closing part.

[0021] In some embodiments, the handle body is provided with a pressure regulating part, the pressure regulating part comprises a manual operation part arranged on the handle body, the manual operation part is in communication with the first tube cavity to manually adjust the pressure of the first tube cavity.

[0022] In some embodiments, the pressure regulating part comprises a pressure relief valve arranged on the handle body, the handle body is provided with a pressure relief cavity in communication with the first tube cavity, and the pressure relief valve seals or opens the pressure relief cavity; preferably, the pressure relief valve comprises a pressing part, the pressing part is connected with a pressure relief hose, and the pressure relief hose is formed with an openable and closable valve.

[0023] The present application generates a tiny pressure fluctuation in the body by assisting the liquid into the cavity, so that a dynamic pressure environment is formed around the calculus, promoting the loosening and movement of the calculus. The pressure fluctuation periodically changes the flow rate and direction of the liquid, thereby generating an impact force on the calculus, gradually reducing the adhesion and static friction between the calculus and the surrounding tissue. In addition, the introduction of the auxiliary cavity provides more liquid paths, ensuring the stable supply of liquid medium, avoiding the pressure instability caused by uneven liquid supply through a single channel, and solving the technical problem that the calculus is difficult to be effectively aspirated due to excessive perfusion pressure.

[0024] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings.

[0026] Figure 1 The structure schematic diagram of the perfusion system related to the pressure measuring sheath provided by the present application;

[0027] Figure 2 The principle schematic diagram of the pressure measuring sheath provided by the embodiment of the present application;

[0028] Figure 3 The structure schematic diagram of the pressure measuring sheath (cooperating with the dilator) provided by the present application;

[0029] Figure 4 The partial structure schematic diagram of the pressure measuring sheath (cooperating with the dilator) provided by the present application;

[0030] Figure 5 The structure split schematic diagram of the pressure measuring sheath (cooperating with the dilator) provided by the present application;

[0031] Figure 6 The structure sectional view of the pressure measuring sheath provided by the present application;

[0032] Figure 7 The structure side view of the pressure measuring sheath provided by the present application;

[0033] Figure 8 The structure sectional view of the pressure measuring sheath provided by the present application;

[0034] Figure 9 The distal end schematic diagram of the pressure measuring sheath (cooperating with the dilator) provided by the present application;

[0035] Figures 10-13 The structure schematic diagram of the pressure measuring port provided by the present application;

[0036] Figure 14A schematic diagram of the pressure measuring sheath pumping in carbon dioxide provided by the present application;

[0037] Figures 15-16 A schematic diagram of the pressure measuring sheath pressure detection principle provided by the present application;

[0038] Figures 17-18 A structure sectional view of the distal end of the pressure measuring sheath provided by the present application;

[0039] Figure 19 A structure sectional view of the cable provided by the present application;

[0040] Figure 20 A structure schematic diagram of the sheath tube (with a sensor at the distal end) provided by the present application.

[0041] Figures 21-22 An operation schematic diagram of the pressure measuring sheath provided by the present application.

[0042] wherein,

[0043] 10 - pressure measuring sheath, 11 - data joint, 20 - endoscope, 200 - endoscope catheter

[0044] 101 - handle main body, 102 - sheath tube, 103 - calibration chamber, 104 - first lumen, 105 - pressure measuring lumen, 106 - sealing member, 107 - pressure measuring port, 108 - port, 109 - finger ring, 120 - first connecting member, 121 - third connecting member, 122 - first sealing cap, 123 - auxiliary lumen, 124 - second connecting member, 125 - second sealing cap, 126 - pressure measuring hole, 127 - pressure relief chamber, 18 - pressure regulating member, 128 - pressing part, 130 - pressure relief hole, 131 - switch, 132 - first connecting part, 133 - pressing part, 134 - rotating part, 135 - limiting part, 136 - flexible section, 138 - valve;

[0045] 50 - pressure sensor, 51 - PCB board, 52 - data joint, 521 - wire core, 522 - insulating outer covering, 53 - joint, 54 - operation button, 55 - exhaust pipe;

[0046] 60 - dilator, 601 - second connecting part, 602 - dilator lumen, 605 - groove, 603 - side hole, 604 - blocking part, 70 - connecting pipe, 71 - carbon dioxide gas pump, 73 - hydrophilic or hydrophobic coating, 74 - one-way valve;

[0047] 80 - resistance bridge sensor, 81 - stainless steel sleeve, 82 - signal line;

[0048] 90 - first negative pressure suction tube, 91 - suction container, 92 - second negative pressure suction tube, 93 - liquid storage container, 94 - liquid inlet tube, 95 - liquid outlet tube, 100 - machine case, 201 - endoscope cable, 202 - image processor. DETAILED DESCRIPTION

[0049] In the description of the present application, it should be understood that the terms "front", "back", "head", "tail", "distal", "proximal", "axial" and "radial" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0050] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection" should be understood broadly, for example, it can be a mechanical connection or an electrical connection, it can be a communication between two elements, it can be directly connected, or indirectly connected through an intermediate medium, and those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0051] Please refer to Figure 1The present embodiment provides a perfusion suction system, which comprises a pressure measuring sheath 10, an endoscope 20, a perfusion device, a suction device, a pressure detection component and a main control machine, the endoscope 20 is inserted into the pressure measuring sheath 10 to observe the inside of the renal pelvis; the perfusion device uses a liquid medium to pressurize and expand the patient's cavity to form a visible interval, and can clean the impurities in the cavity, so that the doctor can observe through the endoscope 20 and the surgical field is clear; the suction device is used to suck the waste liquid in the patient's cavity out of the body, the pressure detection component comprises a pressure sensor 50, which is used to detect the intracavity pressure in the renal pelvis, and the pressure detection component, the perfusion device, the suction device and the main control machine are connected, that is, the main control machine controls the flow and pressure of the perfusion device and the suction device according to the pressure value output by the pressure sensor 50. Specifically, the perfusion device sends liquid into the cavity through the channel of the endoscope 20, the suction device is used to suck the waste liquid and stones in the cavity out through the channel of the pressure measuring sheath 10 under negative pressure, the waste liquid and stones are collected into the suction container 91 through the negative pressure suction pipe, and the perfusion device and the suction device cooperate to keep the cavity at a suitable pressure. Exemplarily, the suction device comprises a diaphragm pump, a first negative pressure suction pipe 90, a suction container 91 and a second negative pressure suction pipe 92, the first negative pressure suction pipe 90 connects the diaphragm pump and the suction container 91, and the second negative pressure suction pipe 92 connects the suction container 91 and the liquid outlet of the pressure measuring sheath 10. The perfusion device comprises a liquid storage container 93 and a perfusion pump, the perfusion pump is connected with the liquid storage bag through a liquid inlet pipe 94, and the perfusion pump communicates with the liquid sending channel through a liquid outlet pipe 95. It can be understood that the liquid medium can enter the renal pelvis through the endoscope 20 or through the pressure measuring sheath 10. Optionally, the perfusion pump and the suction pump are installed on the same machine case 100 with the main control machine. Specifically, the perfusion pump is a peristaltic pump, and the suction pump is a diaphragm pump. In addition, the endoscope is connected with an image processor 202 through an endoscope cable 201, and the main control machine can be installed on the endoscope 20 or the image processor 202.

[0052] The following embodiments are based on the existing perfusion suction equipment, which aims to improve the efficiency of stone removal, the accuracy of pressure measurement and the convenience of operation by improving the sheath tube 102, the endoscope 20, the dilator 60 and the perfusion suction equipment.

[0053] Embodiment 1

[0054] Please refer to Figures 2-13 The pressure measuring sheath 10 provided by the present embodiment comprises a handle and an elongated sheath tube 102, the handle is gripped by the hand of an adult user, the user holds the handle with one hand to flexibly operate the pressure measuring sheath 10, the size and shape of the sheath tube 102 are suitable for entering the body through the body cavity, for example, the target area of the renal pelvis, and longitudinally extends from the proximal end to the distal end, and the handle is connected to the proximal side of the sheath tube 102 so that the handle can be kept outside the body.

[0055] The sheath 102 defines at least a first lumen extending longitudinally from a proximal end to a distal end, and the handle comprises a handle body 101 and a first connector 120 disposed on the handle body 101, wherein the handle body 101 extends in a direction consistent with the axis of the sheath 102 to facilitate user gripping.

[0056] The handle body 101 defines a port 108 in communication with the first lumen 104, and a seal 106 is disposed at the port 108, the seal 106 comprising a passageway therethrough to form a sealed cavity between the first lumen 104 and the body when a medical instrument is passed through the passageway.

[0057] The first connector 120 has a first passageway in communication with the first lumen to constitute a drainage path, and the first connector 120 is adapted to be connected to a negative pressure device to cause the liquid medium in the body to be drained out of the body through the drainage path. Exemplarily, the first connector 120 can be a luer connector or the like, which is connected to a suction device, and the waste liquid is drained into a collection container of the suction device through the first lumen 104 and the first connector 120.

[0058] Please refer to Figure 8 , the handle body 101 is further provided with a pressure regulating member 18, which is used to regulate the pressure of the first lumen. Thus, when the suction pressure is too large to cause the pressure in the renal pelvis to be too large and the organ to be sucked flat, etc., air is quickly introduced through the pressure regulating member 18 to quickly release pressure to ensure the progress of the operation. In some preferred embodiments of the present application, the pressure regulating member 18 is in communication with the first lumen and is disposed away from the drainage path, i.e., the pressure regulating member 18 is away from the drainage path of the waste liquid, so that the user will not be contaminated by the liquid when manually operating the pressure regulating member 18, achieving touch-free and aseptic operation. In addition, the pressure regulating member 18 is provided on the handle body 101, which is ingenious in that when the suction pressure is too large to cause the suction of the calculus to fail, the user needs to manually increase the suction force. Based on the pressure regulating member 18 provided in the present embodiment, the handle body 101 is held, and the pressure in the state chamber is quickly fluctuated between pressure release and negative pressure by repeatedly and quickly controlling the pressure regulating member 18. The repeated pressure fluctuation can produce a strong suction effect, making it easier to extract the calculus or other objects that are adsorbed or stuck. The rapidly changing pressure can produce sufficient impact force to help clear the blockage and ensure the smoothness of the suction passage. By controlling the pressure fluctuation, stronger suction force can be provided when needed, improving the efficiency and success rate of the operation.

[0059] In some embodiments of the present application, the pressure regulating member 18 comprises a pressure relief valve, the handle body is provided with a pressure relief cavity 127 in communication with the first lumen 104 of the sheath 102, and the handle body 101 is provided with a pressure relief valve for sealing or opening the pressure relief cavity 127. In some preferred embodiments of the present application, the pressure relief cavity 127 is arranged proximally to the liquid outlet, i.e. the path of the pressure relief cavity 127 is not the discharge path of the waste liquid, and it is away from the discharge path of the waste liquid. In this way, the waste liquid does not pass through the pressure relief cavity 127, and the user will not be contaminated by the liquid when manually operating the pressure relief valve, achieving touch-free and aseptic operation. In addition, the pressure relief cavity 127 and the pressure relief valve arranged on the handle body 101 are ingenious in that when the suction pressure is too large to cause the suction of the calculus to fail, the user needs to manually increase the suction force. Based on the pressure relief cavity 127 and the pressure relief valve provided in the present embodiment, the handle body 101 is held, when the pressure relief valve is quickly opened, external air quickly enters the cavity, the pressure quickly rises, and the pressure relief effect is achieved; when the pressure relief valve is quickly closed, the suction device continues to work, the pressure in the cavity quickly drops, forming a negative pressure for suction; by repeatedly opening and closing the pressure relief valve, the pressure in the cavity will quickly fluctuate between pressure relief and negative pressure, and the repeated pressure fluctuations can produce a strong suction effect, making it easier to extract the calculus and other objects that are adsorbed or stuck. Illustratively, the pressure relief valve comprises a pressing portion 128 connected with the pressure relief hose (pressure relief cavity 127), and a flapper 138 is formed on the pressure relief hose (pressure relief cavity 127) to be openable and closable. In this way, the user controls the opening degree and closing of the flapper 138 by pressing the pressing portion 128. Illustratively, the pressing portion is connected with the pressure relief pipe, and pressing the pressing portion can adjust the opening degree and closing of the flapper thereon, thereby adjusting the volume of external air entering the first lumen.

[0060] In an embodiment of the present application, the guide sheath further comprises a PCB board 51 and an operation button 54, the PCB board 51 is arranged in the handle body, the PCB board 51 is provided with at least one data connector 52, the data connector 52 extends from the handle body 101, and the data connector 52 is adapted to be connected with an external perfusion and suction device. Further, the handle body 101 is provided with the operation button 54, and the user controls the operation of perfusion and suction by controlling the operation button 54. Specifically, the operation button 54 is located at the upper part of the handle body 101 for controlling the operation of perfusion and suction, and the pressure regulating member 18 is also arranged at the upper part. Thus, please refer to Figures 21-22The upper part of the handle body 101 constitutes the operation area, where perfusion, suction, pressure relief, and increased suction force operations are performed. All these operations can be completed by fingers, greatly simplifying the use process. The operation button 54 and the pressure regulating piece 18 are both set in the upper part, and no frequent movement of the handle is required during operation, only the fingers need to operate on the upper part of the handle body 101. This reduces the range of hand movement and improves operation efficiency. Compared with the traditional design that requires simultaneous control of multiple devices, the invention integrates multiple control functions into one. Doctors no longer need to switch or coordinate multiple devices, and only one handle needs to be operated to complete multiple functions, which reduces the complexity of operation.

[0061] The PCB board 51 is set in the middle of the handle body 101, optimizing the internal space layout and making the shape and weight distribution of the handle body 101 more reasonable. The handle body 101 is designed more ergonomically, increasing the comfort of use. In some examples of the invention, the bottom of the handle body 101 is provided with a finger ring 109, so that the operation surface is located on the top surface of the handle body 101. Such design is ergonomic, ensuring that users can maintain a natural and comfortable grip posture during operation. The design of the finger ring 109 provides an additional support point, helping users to hold the handle more stably and reducing hand muscle fatigue. Due to the presence of the finger ring 109, users can pass a finger through the finger ring 109, which can both firmly hold the handle and flexibly use other fingers for operation. The operation surface on the top of the handle body 101 is more convenient for finger access, and the operation is more simple and efficient. The setting of the finger ring 109 makes the center of gravity of the handle more stable, and when holding the handle, the weight can be more evenly distributed, improving the comfort of operation. The finger ring 109 makes the handle more stable, and the handle is not easy to slide or rotate during operation, thereby improving the accuracy and control of the operation. In summary, the design of the finger ring 109 makes the handle body 101 more in line with the user's usage habits and needs, especially in scenarios that require long-term holding and delicate operation, significantly improving the user experience.

[0062] In the embodiment of the present application, the bottom end of the sheath tube 102 is provided with a liquid outlet, where the bottom end refers to the end facing the ground, i.e. the design of the bottom end liquid outlet utilizes gravity to make the waste liquid and stones flow downward, thereby enhancing the discharge efficiency. One end of the first connecting member 120 is arranged at the liquid outlet, and the other end extends out of the handle main body 101. The first connecting member defines a first channel axis perpendicular to the axis of the sheath tube 102. In this way, compared with discharging waste liquid through an inclined side arm extending from the sheath tube 102, the present application forms a straight discharge path for discharging waste liquid, which directly flows into the first connecting member 120 through the bottom end of the sheath tube 102. The straight path reduces the resistance encountered by the liquid and stones in the channel, thereby reducing the risk of blockage. Since the first connecting member 120 is directly connected to the liquid outlet without a bent pipe, the waste liquid and stones do not need to change the flow direction when being discharged. This design significantly reduces the probability of stones being trapped and stuck in the pipe. In addition, the first connecting member is arranged below the handle main body 101 instead of the side, so that the operation of the doctor is not disturbed by the negative pressure suction device, further improving the smoothness and accuracy of the operation.

[0063] In the embodiment, the handle main body 101 is provided with a first connecting part 132 at the port 108, which is suitable for detachable connection with the dilator 60. The dilator 60 has a hand-held part and an elongated catheter. The first connecting part 132 is suitable for detachable connection with a second connecting part 601 of the hand-held part of the dilator 60, and specifically, the first connecting part 132 is snap-connected with the second connecting part 601. A rubber sealing ring (106) is connected with the elongated sheath tube, and is located in the handle main body 101. The rubber sealing ring is connected to the proximal end of the sheath tube, and is used for sealing penetration of the elongated dilator 60 or the catheter of the endoscope 20. Specifically, the handle main body 101 is provided with a pressing member, which includes a pressing part 133 pressed above a rubber valve and a rotating part 134 rotationally matched with the handle main body 101. The rubber sealing ring is provided with a lower pressure relief hole 130, and the pressing cover is provided with an upper pressure relief hole 130. The pressing cover is rotated by rotating the ring to make the lower pressure relief hole 130 communicate with the upper pressure relief hole 130, thereby achieving pressure stabilization.

[0064] In addition, the handle main body 101 is further provided with a limiting part 135 for preventing the dilator 60 from being pulled out, so as to limit rotation of the dilator 60 during cooperation of the dilator 60 with the sheath, facilitate operation, and improve efficiency.

[0065] In an example of the present application, the distal end of the sheath tube 102 is a flexible section 136 that can be bent. The endoscope 20 includes an operating part and a bending part, and the operating part can drive the bending part to bend. The endoscope 20 is inserted into the sheath tube 102, the bending part is accommodated in the flexible section 136, and the bending part can drive the flexible section 136 to bend.

[0066] Embodiment 2

[0067] On the basis of embodiment 1, the present application further provides a pressure measuring sheath for detecting the pressure in the body, such as the pressure in the renal pelvis, wherein a pressure measuring lumen 105 extending longitudinally from the proximal end to the distal end is formed in the tube wall of the sheath tube, wherein the pressure measuring lumen 105 is arranged side by side with the first lumen 104, and a pressure measuring port for sensing the pressure of the liquid in the body is arranged at the distal end of the pressure measuring lumen 105, and the handle comprises a second connecting member 124 arranged on the handle body, the second connecting member 124 has a second channel communicating with the pressure measuring lumen 105, and a pressure sensor is arranged on the pressure measuring lumen 105, the second channel or any path communicating therewith, which can collect the pressure data of the pressure measuring lumen. Exemplarily, the pressure sensor 50 can be arranged at the distal end of the endoscope 20, at the distal end of the pressure measuring sheath 10, in the pressure measuring lumen 105 in the pressure measuring sheath 10, or at any position on the pressure measuring path communicating with the pressure measuring lumen 105, such as an external device, and the positions herein include but are not limited to the second connecting member 124 communicating with the pressure measuring lumen 105.

[0068] Further, in the present embodiment, the pressure sensor 50 is mounted on the inner side or the outer side of the second channel. In the present embodiment, the outer wall of the second channel is provided with a pressure measuring hole 126, and the pressure sensor 50 is arranged on the inner side of the handle body, and at least the sensing part thereof is arranged at the pressure measuring hole 126 to sense the pressure of the pressure measuring lumen 105. It almost does not occupy the space of the second channel, and the second channel 124 can also be used as other auxiliary lumens, avoiding resource occupation by other instruments. It can be understood that the detection signal of the pressure sensor 50 can be connected with external devices through a connecting line for signal transmission and processing.

[0069] In some embodiments of the present application, the pressure sensor 50 is a gauge pressure sensor, the sheath tube 102 and the handle body 101 are sealingly connected to build a calibration chamber 103 in the handle body, the calibration chamber 103 is open to the outside for calibration and adjustment of the pressure sensor 50, the PCB board 51 and the pressure sensor 50 are arranged in the calibration chamber 103, the outer wall of the second channel is provided with a pressure measuring hole 126 communicating with the calibration chamber, the gauge pressure sensor is positioned in the chamber 103, and at least the sensing film thereof is arranged at the pressure measuring hole 126 to collect the pressure in the pressure measuring lumen, and the second channel has an opening which can be open or closed by a sealing part such as a second sealing cap 125, and the calibration of the pressure sensor 50 is realized by the opening and the calibration chamber 103.

[0070] Specifically, the working principle of the gauge pressure sensor is to determine the pressure value by measuring the pressure change of the sensor sensing film caused by the fluid or gas, and then compare this value with the ambient pressure to obtain the relative pressure value. If the pressure at the measurement point is higher than the atmospheric pressure, the sensor outputs a positive value; if it is lower than the atmospheric pressure, it outputs a negative value or zero. When the pressure sensing sheath is not inserted into the body, the pressure sensing port 107 at the distal end of the pressure sensing sheath 10 is in communication with the calibration chamber 103, which realizes the calibration of the gauge pressure sensor. When the pressure sensing sheath is inserted into the body, the second sealing cap 125 is opened, the second channel is open and in communication with the outside, at this time, the calibration of the gauge pressure sensor is realized in cooperation with the calibration chamber 103. In addition, the gauge pressure sensor is installed in the handle main body 101, compared with being installed in the external setting such as the main control machine, it is set at the handle position, which reduces the volume of the pressure sensing cavity, quickly and accurately responds to pressure changes, avoids the attenuation and lag of the signal in a large space, and has higher precision.

[0071] In the present embodiment, the pressure sensor 50 is located in the handle main body 101 for electrical connection with the PCB board 51. The data connector 52 is used to connect with external devices such as the main control machine, perfusion device, suction device, display device, etc. to realize the transmission of pressure signal and control of perfusion and suction operation state.

[0072] Please refer to Figure 19 , the data connector 52 (including the wire core 521 and the insulating outer covering 522) has an exhaust pipe 55 in communication with the outside and the handle main body 101 to realize the communication between the calibration chamber in the handle main body and the outside. In addition, due to the pressing operation of the operation button or other operations of the handle, the pressure change in the sealed calibration chamber 103 in the handle main body 101 will cause the basic deviation of the sensor, the design of the exhaust pipe eliminates the pressure fluctuation caused by the operation button 54, maintains the pressure stability in the handle main body 101, and avoids the pressure fluctuation in the handle main body 101 to reduce the pressure measurement accuracy of the pressure sensor 50. Through reasonable layout of the pressure sensor 50 and its auxiliary equipment, combined with the design of the sealed cavity and the exhaust pipe 55, accurate pressure monitoring of the pressure sensing pipe cavity 105 is realized, while the system stability and operation simplicity are ensured.

[0073] As mentioned before, the distal end of the pressure sensing pipe cavity 105 has a pressure sensing port 107 which is adapted to sense the pressure in the human body cavity and transmit it to the pressure sensing pipe cavity. The pressure sensing port can be set in various ways: for example, please refer to Figure 10 , the pressure sensing port 107 is in communication with the outside and not in communication with the first pipe cavity 104, i.e. the outer wall of the pressure sensing pipe cavity 105 is opened to form the pressure sensing port. The outer communication type pressure sensing port is in communication with the high pressure area in the cavity, has higher measurement accuracy, and can truly feedback the pressure in the cavity, but foreign matters can easily enter the pressure sensing pipe cavity through the outer pressure sensing port, and the pressure sensing accuracy will decrease after the pressure sensing pipe cavity is blocked; another embodiment is shown in Figure 11, the pressure measuring port 107 is in communication with the first lumen 104 and not with the outside, that is, the inner wall of the pressure measuring lumen 105 has an opening to form a pressure measuring port, which is in communication with the low pressure area in the cavity, the measured value is relatively lower than the overall pressure in the cavity, but the risk of foreign matter blocking the pressure measuring lumen is excluded; in another embodiment, please refer to Figure 12 and Figure 13 , the pressure measuring port 107 is in communication with the outside and the first lumen 104, at this time, the inner wall and the outer wall of the pressure measuring lumen 105 have openings, and in this embodiment, the openings of the inner wall and the openings of the outer wall correspond radially, the full-through type pressure measuring channel port is in communication with the high pressure area and the low pressure area in the cavity at the same time, the measurement accuracy is higher, and the cavity pressure can be truly fed back, but there is also the risk of pipe blocking. Or the openings of the inner wall and the openings of the outer wall are staggered, for example, in the form of Z, the Z-shaped pressure measuring port is in communication with the high pressure area and the low pressure area in the cavity at the same time, the measurement accuracy is higher, and the cavity pressure can be truly fed back, and there is no risk of pipe blocking. More preferably, the distal end of the pressure measuring lumen 105 is located proximally to the distal end of the first lumen, and the distal end of the pressure measuring lumen is provided with a pressure measuring port penetrating the outside and the first lumen, that is, the distal end of the pressure measuring lumen is not consistent with the distal end of the first lumen, and the pressure measuring port penetrates the outside and the first lumen.

[0074] In some embodiments of the present application, the proximal end of the sheath 102 is provided with a pressure relief hole 130, which is adapted to communicate with the outside to facilitate the entry of air. When the sheath 102 is placed into operation through an instrument or the like, it will cause pressure fluctuation, and by opening the pressure relief hole 130 to introduce an appropriate amount of air, the stability of the cavity pressure can be ensured. In this way, the pressure fluctuation caused by external operation is avoided, and the pressure measurement accuracy is improved. It can be understood that the pressure relief hole 130 should be a small hole or a hole with valve control to introduce an appropriate amount of air to relieve the excessive internal pressure when necessary. In the embodiments of the present application, the proximal end of the sheath 102 is provided with a sealing member 106, and the endoscope 20 or the dilator 60 is sealingly inserted into the sheath 102. The sealing member 106 is provided with a pressure relief hole 130, and the pressure relief hole 130 is provided with an on-off switch to open or close the pressure relief hole 130, so as to solve the influence of pressure fluctuation caused by the entry of an instrument or the like on pressure detection, and to achieve small-scale pressure relief. Alternatively, the sheath 102 comprises a sealing member 106 and an elongated sheath, the sealing member 106 has a valve port, the sealing member 106 is connected to the proximal end of the sheath, the valve port is for the sealing penetration of the elongated dilator 60 or the endoscope 20, the proximal end of the handle body 101 is provided with a pressing member, the pressing member comprises a pressing part 133 which is pressed above the sealing member 106 and a rotating part 134 which is rotationally connected with the handle body 101, the sealing member 106 is provided with a lower pressure relief hole 130, and the pressing part 133 is provided with an upper pressure relief hole 130, the rotating ring is rotated to drive the pressing part 133 to rotate, so that the lower pressure relief hole 130 communicates with the upper pressure relief hole 130 to achieve pressure stabilization.

[0075] Embodiment 3

[0076] In some embodiments of the present application, the present application utilizes dual channel perfusion, the flow of fluid between different channels is affected by the pressure difference. The liquid in the high pressure area will flow to the low pressure area, while the low pressure area will attract more fluid. The endoscope 20 enters the sheath tube 102, the waste liquid is sucked out of the body through the first lumen 104 of the sheath tube 102, the liquid enters the body through the endoscope 20 conduit, one suction and one injection, when the negative pressure suction pressure in the sheath tube 102 is very large, the pressure inside the sheath tube 102 is much lower than the pressure in the endoscope 20, such a large pressure difference will cause more liquid to enter the body, at this time it will cause the perfusion of the liquid to be too large, and form a too high perfusion pressure in the local area, causing the waste liquid such as stones to be difficult to suck.

[0077] Based on this, the handle body 101 of the present embodiment is provided with a third connecting piece 121, which can be blocked by a first sealing cap 122. When liquid needs to be sent, the first sealing cap 122 is opened, and when it is not needed, the first sealing cap 122 is closed, so as to avoid the influence on the negative pressure. The sheath tube 102 has an auxiliary lumen 123 which is isolated from the first lumen 104 and the pressure measuring lumen 105, the third connecting piece 121 communicates with the auxiliary lumen 123, and the third connecting piece 121 and the auxiliary lumen 123 constitute a liquid inlet channel for the perfusion liquid medium to enter, so that the perfusion liquid enters the body through the third connecting piece 121 and the auxiliary lumen 123 to generate a small pressure fluctuation, so that a dynamic pressure environment is formed around the stones, promoting the loosening and movement of the stones. The pressure fluctuation will periodically change the flow rate and direction of the liquid, thereby generating an impact force on the stones, gradually reducing the adhesion and static friction between the stones and the surrounding tissue. In addition, the introduction of the auxiliary lumen 123 provides more liquid inlet paths, ensuring the stable supply of liquid medium, avoiding the pressure instability caused by uneven liquid supply in a single channel, and solving the technical problem that the stones are difficult to be effectively sucked due to excessive perfusion pressure.

[0078] Optionally, the inner diameter of the second channel 124 and the third connecting piece 121 is greater than the inner diameter of the pressure measuring lumen 105 and the auxiliary lumen 123, so as to facilitate the entry of external instruments.

[0079] Embodiment 4

[0080] A water film is easily formed at the pressure measuring port 107 at the distal end of the pressure measuring lumen 105. The formation of the water film makes it difficult for the pressure signal to be transmitted to the pressure sensor 50 in a timely and accurate manner, and it is difficult to detect the pressure in real time. In addition, the water film tension causes the signal transmitted to the pressure sensor 50 to deviate from the actual pressure signal, thereby affecting the accuracy of the measurement. The pressure sensor 50 measures the pressure P=P3=P1+P2, P1 is the intracavity pressure, P2 is the water film tension, and P3 is the pressure in the pressure measuring lumen 105.

[0081] Based on this, in some embodiments of the present application, the pressure measuring sheath 10 further comprises a tension eliminating mechanism to eliminate the influence of water film on intracavity pressure detection

[0082] As mentioned before, please refer to Figure 14 The handle body 101 is provided with a first connecting piece 124 in communication with the pressure measuring tube cavity 105, the first connecting piece 124 has an opening which can be sealed or opened by a second sealing cap 125, the first connecting piece 124 constitutes an air inlet tube for the high-frequency low-pressure gas from the outside to eliminate the water film; since the pressure sensor 50 does not occupy the space of the first connecting piece 124, the first connecting piece 124 can be used as other auxiliary tube cavities, improving the space utilization efficiency of the pressure measuring sheath 10. Effectively eliminating the interference of water film on the signal transmission of the pressure sensor 50, ensuring the timely and accurate transmission of the pressure signal. For example, please refer to Figure 15 , open the second sealing cap 125 of the second channel 124, and send high-frequency micro-pressure gas such as carbon dioxide to the second channel 124 to break the water film tension balance of the liquid in the cavity at the distal end port 108 of the pressure measuring tube cavity 105, at this time the pressure measured by the pressure measuring module is P=P3+P4=P1+P2 (when the water film tension balance is broken P4=P2, P=P3=P1), wherein P1 is the intracavity pressure, P2 is the water film tension, P3 is the pressure in the pressure measuring tube cavity 105, and P4 is the pressure of the high-frequency pulse carbon dioxide gas P4. For example, the second connecting piece 124 is connected to the carbon dioxide gas pump 71 interface through the connecting tube 70.

[0083] In addition, a one-way valve 74 is provided at the second connecting piece 124 to allow gas to be pumped into the pressure measuring tube cavity 105 from the outside only to remove the pressure accuracy decline caused by water film tension. If the one-way valve 74 is not provided, after the second sealing cap 125 is closed, foreign matter and water column will re-enter the pressure measuring tube cavity 105, and the second sealing cap 125 will press the air, causing a pressure difference in the pressure measuring tube cavity 105, combined with the influence of water film, causing the pressure measuring accuracy to decline. The use of the one-way valve 74 can prevent the water in the cavity from flowing backward into the pressure measuring tube cavity 105 after the inflation is completed, improving the pressure measuring accuracy.

[0084] In other embodiments, please refer to Figure 16 The inner wall of the pressure measuring tube cavity 105 is provided with a hydrophilic or hydrophobic coating 73, and the water film tension can be considered as no contact to the pressure measuring tube cavity 105, at this time the pressure measured by the pressure measuring module is P=P3=P1. Reducing the retention of water film, improving the self-cleaning ability and measurement accuracy of the pressure measuring tube cavity 105.

[0085] This embodiment effectively eliminates the influence of water film on pressure detection by introducing high-frequency low-pressure gas, coating treatment, one-way valve and other measures, significantly improving the measurement accuracy and stability of the system,

[0086] Example 5

[0087] When the pressure sensing sheath 10 (usually used in catheterization and other surgical operations) enters the body cavity, the negative pressure suction and perfusion have not yet started. At this time, the dilator 60 has been inserted into the pressure sensing sheath 10 to ensure that the pressure sensing sheath 10 can smoothly enter the body cavity. Since the dilator 60 occupies the first lumen 104 of the sheath tube 102, it is easy to cause foreign matter to enter the pressure sensing lumen 105, causing the pressure sensing lumen 105 to be blocked, and the pressure sensing accuracy to drop sharply.

[0088] The dilator 60 is provided with a blocking part to limit the foreign matter from entering the pressure sensing lumen 105 through the pressure sensing port 107. Please refer to Figure 17 .

[0089] In some embodiments of the present application, the pressure sensing port 107 is in communication with the outside and the first lumen, at this time, the inner wall and the outer wall of the pressure sensing lumen have openings in the inner wall and the outer wall of the opening corresponding to the radial direction, that is, the distal end of the pressure sensing lumen is not consistent with the distal end of the first lumen, and the pressure sensing port penetrates the outside and the first lumen. The dilator 60 forms a cavity inside, and the side wall of the cavity has a side hole 603 in communication with the distal end of the pressure sensing lumen 105 and the pressure sensing port 107, and the foreign matter can enter the cavity from the side hole 603 of the dilator 60 and be discharged from the cavity.

[0090] The side hole 603 is not less than the diameter of the pressure sensing port 107. The diameter of the side hole 603 of the dilator 60 is not less than the diameter of the pressure sensing port 107, which ensures that the foreign matter can smoothly pass through the side hole 603 and be discharged from the cavity, prevents the pressure sensing lumen 105 from being blocked, and improves the safety and convenience of the surgical operation.

[0091] In other embodiments, please refer to Figure 18 , the dilator 60 is provided with a blocking part 60 that can block the pressure sensing port 107 at the distal end of the pressure sensing lumen 105 to limit the foreign matter from entering the pressure sensing lumen 105. In this way, when entering the cavity, the dilator 60 is pulled out of the sheath tube 102, avoiding the introduction of foreign matter into the pressure sensing lumen 105, ensuring the smoothness of the pressure sensing lumen 105 and the pressure sensing accuracy. For example, the blocking part 60 is made of flexible material to allow the dilator 60 to be pulled out of the sheath tube 102. The blocking part 60 is made of flexible material, allowing the dilator 60 to be smoothly pulled out of the sheath tube 102 during use, avoiding the inconvenience and potential damage caused by hard materials.

[0092] A gap is reserved between the blocking part 60 and the pressure sensing port 107. A suitable gap is reserved between the blocking part 60 and the pressure sensing port 107 to ensure the blocking effect while avoiding the difficulty of operation and the pressure change of the pressure sensing lumen 105 caused by excessive sealing. The area of the dilator outer wall near the blocking part forms a groove 605 for the blocking part to retract into the groove after exiting the pressure sensing port, so as to facilitate the smooth extraction of the dilator from the sheath tube.

[0093] By setting the blocking part and the plugging part 60 on the dilator 60, the problem of blockage and pressure measurement accuracy reduction caused by foreign matter entering the pressure measuring lumen 105 during the process of entering the body cavity of the pressure measuring sheath 10 is solved.

[0094] In the present embodiment, referring to Figure 20 , the pressure measuring lumen 105 is provided with a pressure sensor 50 at a position close to the pressure measuring port, a signal line 82 is arranged in the pressure measuring lumen to transmit the pressure signal, the pressure sensor 50 is a resistance bridge sensor 80, and the sensor is arranged at the distal end of the sheath. The temperature acts on the surface of the sensor, the resistance of the temperature measuring bridge arm changes, and a pressure difference is generated. At the same time, the gas and liquid pressure act on the surface of the sensor, the sensor generates a micro-strain, the resistance of the pressure measuring bridge arm changes, and a pressure difference is generated. Then, the two groups of voltage signals are converted into digital signals by the internal collector, and finally the data is read out through the SPI interface. In this way, the resistance bridge sensor can measure both temperature and pressure, and through the principle of resistance change and pressure difference, accurate data collection and transmission are realized.

[0095] The distal cavity of the pressure measuring lumen 105 is provided with a protective sleeve, the resistance bridge sensor 80 is installed in the protective sleeve, and the sensing surface of the resistance bridge sensor 80 is in communication with the pressure measuring port 107 at the distal end of the pressure measuring lumen 105. Preferably, a stainless steel protective tube sleeve is used for protection to avoid accidental extrusion of the sensor or accidental hits by laser energy devices.

[0096] The resistance sensor 80 transmits signals through the signal line 82 arranged in the pressure measuring lumen.

[0097] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0098] Although embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A perfusion suction system, characterized in that, The system comprises The guide sheath comprises a handle and a sheath tube, the sheath tube is sized and shaped to access a target region in a body through a body lumen, and it extends longitudinally from a proximal end to a distal end, the sheath tube defines a first lumen adapted for entry of an external instrument, and a secondary lumen is formed in the sheath tube wall extending longitudinally from the proximal end towards the distal end; The handle comprises a handle body, a first connector and a third connector disposed on the handle body, the handle body defines a port in communication with the first lumen, the port is provided with a seal, the seal comprises a passage therethrough, a medical instrument can be sealed through the port to enter the first lumen, the first connector has a first channel, the first channel is in communication with the first lumen to form a drainage path, the first connector is adapted to be connected with a negative pressure device to enable the liquid medium in the body to be drained out of the body through the drainage path, the third connector is in communication with the secondary lumen to form a liquid supplement channel, and the third connector is configured to be adapted to be connected with an external device to facilitate the inflow of the liquid medium into the secondary lumen and into the body; An endoscope is sealed through the port of the handle body to enter the first lumen, and the gap between the first lumen and the endoscope drains the waste liquid in the body; An irrigation device is connected with the endoscope to send the liquid medium into the body through the endoscope catheter, the irrigation device uses the liquid medium to pressurize and expand the patient's cavity to form a visible interval, and can clean the impurities in the cavity, so that the doctor can observe through the endoscope and the surgical field is clear; An aspiration device is connected with the first connector, and the aspiration device provides negative pressure for the drainage path to suck the waste liquid in the body out of the body; A master control machine is connected with the irrigation device and the aspiration device to control the operating state of the irrigation and aspiration.

2. The irrigation suction system according to claim 1, characterized in that A pressure measuring lumen is formed in the sheath tube wall extending longitudinally from the proximal end towards the distal end, a pressure measuring port is provided at the distal end of the pressure measuring lumen for sensing the pressure of the liquid in the body, the handle comprises a second connector disposed on the handle body, the second connector has a second channel in communication with the pressure measuring lumen, and a pressure sensor is provided on the pressure measuring lumen, the second channel or any path connected therewith.

3. The irrigation suction system of claim 2, wherein, The pressure measuring lumen, the first lumen and the secondary lumen are separately provided.

4. The irrigation suction system of claim 2, wherein, The bottom end of the first lumen is provided with a liquid outlet, the first channel is located below the handle, and the axis of the first channel is perpendicular to the axis of the first lumen to form a straight drainage path.

5. The irrigation suction system of claim 2, wherein, The sheath tube is sealingly connected with the handle body to build a calibration chamber in the handle body, the calibration chamber is in communication with the outside, the handle body port is provided with a seal to facilitate the endoscope or dilator to be sealed therethrough, a PCB board and a pressure sensor are installed in the calibration chamber, the pressure sensor is a gauge pressure sensor, a pressure measuring hole is provided on the outer wall of the second channel in communication with the calibration chamber, the gauge pressure sensor is positioned in the chamber, and at least its sensing film is arranged at the pressure measuring hole to collect the pressure in the pressure measuring lumen, and the second channel has an opening that can be in communication with the outside, the opening can be opened or closed by a sealing part, and the calibration of the pressure sensor is realized by the cooperation of the opening and the calibration chamber.

6. The irrigation suction system of claim 5, wherein, The guide sheath further comprises: A PCB board is installed in the handle body, the PCB board is connected with the pressure sensor, the PCB board is provided with at least one data connector, the data connector extends from the handle body, and the data connector is configured to be connected with an external perfusion and suction device to transmit a signal. An operation button is arranged on the handle body and connected with the PCB board to control the operation state of perfusion and suction.

7. The irrigation suction system according to claim 6, characterized in that The first connector is arranged at the bottom of the handle body, the second connector and the third connector are arranged at the left side wall and the right side wall of the handle respectively, and the operation button is arranged at the upper part of the handle.

8. The irrigation suction system of claim 6, wherein, The third connector is provided with an interface, and the interface is closed or opened by a closure.

9. The irrigation suction system of claim 6, wherein, The handle body is provided with a pressure regulating part, the pressure regulating part comprises a manual operation part arranged on the handle body, and the manual operation part is communicated with the first lumen to manually adjust the pressure of the first lumen.

10. The irrigation suction system of claim 9, wherein, The pressure regulating part comprises a pressure relief valve arranged on the handle body, the handle body is provided with a pressure relief cavity communicated with the first lumen, and the pressure relief valve seals or opens the pressure relief cavity; preferably, the pressure relief valve comprises a pressing part, the pressing part is connected with a pressure relief hose, and a valve capable of being opened and closed is formed on the pressure relief hose.

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