TWM605102U - Negative pressure suction device - Google Patents

Abstract

This creation discloses a negative pressure suction device, which includes a negative pressure suction device, an expansion tube, and a hollow sheath; the sheath is formed by connecting a proximal sheath and a distal sheath, and is located near the proximal sheath. The end is provided with a movable sealing cover, the expansion tube can be inserted from the proximal end of the proximal sheath and extend to the distal end of the distal sheath and fix the expansion tube on the proximal sheath; the proximal sheath At least two hollow side tubes are connected to the upper part, and the negative pressure suction device is connected to one end of the side tube away from the sheath tube. The purpose of this creation is to provide a negative pressure suction device that can effectively, conveniently, accurately and efficiently remove stones. At the same time, the negative pressure suction device can also be used for the removal of foreign bodies and resected tissues in the body cavity.

Description

Negative pressure suction device

This creation is about the field of medical equipment, especially a negative pressure suction device with easy operation, simple structure and high removal efficiency.

Kidney stones and gallstones have plagued humans for a long time. Complications caused by stones in the urethra or biliary tract usually require surgical intervention. The traditional surgical procedure for removing stones is that the surgeon cuts the patient's abdomen to remove the stones. The patient needs to stay in the hospital for a long time to recover. The external stone removal design reduces the patient's pain and recovery time.

In the past four decades, the treatment of stone diseases has made great progress, especially in the field of external endoscopic lithotripsy. However, all these new types focus on the breaking of channels and stones. Extracorporeal shock wave lithotripsy technology uses pressure waves to crush stones, but requires the patient to remove the stone fragments. Percutaneous nephrostomy sheaths and various ureteral sheaths allow contact with stones during lithotripsy. However, they also require patients to remove stone fragments or crushed stones by themselves through pressure washing and stone forceps. Pressure irrigation and stone forceps increase the operation time and surgical complexity.

The purpose of this creation is to provide a negative pressure suction device that can effectively, conveniently, accurately and efficiently remove stones. At the same time, the negative pressure suction device can also be used to remove foreign bodies and resected tissues in the body cavity.

The technical means of this creation is a negative pressure suction device, including a negative pressure suction device, a dilation tube, and a hollow sheath; it is characterized in that the sheath is formed by connecting a proximal sheath and a distal sheath. The proximal end of the proximal sheath is provided with a movable sealing cover, and the expansion tube can be inserted from the proximal end of the proximal sheath and extend to the distal end of the distal sheath and fix the expansion tube on the proximal sheath; At least two hollow side tubes are connected to the proximal sheath tube, and the negative pressure suction device is connected to one end of the side tube away from the sheath tube.

In the above-mentioned negative pressure suction device, an auxiliary channel is provided on the outer side of the sheath tube, and the sheath tube and the auxiliary channel form a double-lumen structure.

In the above-mentioned negative pressure suction device, an expandable structure is provided at the distal end of the distal sheath.

In the above-mentioned negative pressure suction device, the expandable structure is an inflatable airbag or an expansion spring that can be expanded or contracted.

In the above-mentioned negative pressure suction device, a radiopaque interlayer is provided on the inner wall of the sheath, or a radiopaque interlayer is provided on the outer wall of the sheath, or on the wall of the sheath. Inlaid with radiopaque interlayer.

In the above-mentioned negative pressure suction device, the movable sealing cover is provided with a through hole for inserting the endoscope, and the diameter of the through hole is adapted to the outer diameter of the endoscope.

In the above-mentioned negative pressure suction device, the inner diameter of the side tube is 0.8 to 1.2 times the diameter of the hollow part of the proximal sheath; or the inner diameter of the side tube is the diameter of the hollow part of the distal sheath 0.8 to 1.2 times of

In the above-mentioned negative pressure suction device, the side tube extends in the direction of the proximal sheath tube, and the included angle between the side tube and the proximal sheath tube is 20° to 70°.

In the above-mentioned negative pressure suction device, the sheath tube is a rigid, semi-rigid or flexible tube, and the proximal sheath tube is a transparent or semi-transparent structure; the side tube connected with the negative pressure suction device and A marking band is arranged above the connection of the proximal sheath; the side tube is connected with a pressure adjusting mechanism for adjusting the pressure.

In the above-mentioned negative pressure suction device, the negative pressure suction device includes a collection container, and the collection container includes a bottle body and an upper end cover that is detachably connected to the bottle body. The upper end cover is provided with an inlet pipe and an outlet pipe, the inlet pipe is connected to the corresponding side pipe through a connecting pipe, the outlet pipe is connected to the negative pressure generating device; the outlet pipe is connected to the corresponding side pipe through a three-way valve The negative pressure generating device is connected.

The negative pressure suction device of this creation is simple in structure and has one or more side tubes, which improves the feasibility of inserting auxiliary equipment, and improves the accuracy of positioning through the auxiliary channel, and improves the suction of rubble through the expandable mechanism Or the scope and effect of other organizational structures. The negative pressure suction device of the invention can be widely used for the removal of stones and the extraction of tissue fragments, which reduces the pain of patients and improves operation efficiency.

The technical means of this creation will be further described in detail below in conjunction with specific implementations, but it does not constitute any restriction on this creation.

Example 1

As shown in Figures 1-11, a negative pressure suction device 10 includes a negative pressure suction device, a dilation tube 90, and a hollow sheath 20; the sheath 20 is connected by a proximal sheath 30 and a distal sheath 40 The movable sealing cap 100 is provided at the proximal end of the proximal sheath 30, and the expansion tube 90 can be inserted from the proximal end of the proximal sheath 30 and extended to the distal end of the distal sheath 40 and the expansion tube Fixed on the proximal sheath 30; the proximal sheath 30 is connected with at least 2 hollow side tubes, preferably 2, 3, 4, 5, and the number of side tubes in this embodiment is Two, here are marked as the first side tube 50 and the second side tube 60, the negative pressure aspirator is connected to one of the side tubes, that is, the end of the first side tube 50 away from the sheath tube. Specifically, the proximal sheath 30 includes a first proximal end 31, a first distal end 32, and a first lumen 33, and the distal sheath 40 includes a second proximal end 41, a second distal end 42 and a Two inner cavities 43, the first side tube 50 includes a third proximal end 51, a third distal end 52 and a third inner cavity 53, the first distal end 32 and the distal sheath of the proximal sheath 30 The second proximal end 41 of the tube 40 is connected, and the connection is preferably a peelable connection or a detachable connection. For example, the distal sheath 40 is made of a peelable or tearable material. This can also be achieved with perforations made along the longitudinal axis of the distal sheath 40. Further preferably, two side wings are provided at the place where the distal sheath 40 is connected to the proximal sheath 30, which will facilitate separation, peeling, and tearing. The movable sealing cover 100 is provided on the first proximal end 31 , The expansion tube 90 is inserted into the sheath 20 through the first proximal end 31.

As shown in FIG. 3, the movable sealing cover 100 is provided with a through hole 101 for inserting an endoscope, and the diameter of the through hole 101 is adapted to the outer diameter of the endoscope. As shown in FIG. 3, the first side tube 50 is connected to the outside of the proximal sheath 31. The inner diameter of the first side tube 50 is 80% to 120% of the diameter of the first lumen 33 of the proximal sheath 30, such as 80%, 100%, 120%; or the first side tube 50 The inner diameter is 80% to 120% of the diameter of the second lumen 43 of the distal sheath 40, such as 80%, 100%, 120%, so as to ensure the smooth discharge of stones or other tissue structures. The sheath 20 is a rigid, semi-rigid or flexible tube. The sheath 20 is made of any medical grade material, including but not limited to nylon, polyethylene, polyvinyl chloride, polycarbonate, polypropylene or fluorinated ethylene propylene. The sheath 20 can be strengthened by rigid or semi-rigid coils or filaments to achieve the desired strength. The proximal sheath 30 and the distal sheath 40 may be connected together as a single piece or a sleeved connection that can be connected together. Preferably, the proximal sheath 30 is rigid and is constructed of polypropylene, polycarbonate or polyvinyl chloride, while the distal sheath 40 is semi-rigid and is composed of nylon, polyethylene or fluorinated ethylene propylene. . The sheath 20 also has an inner cavity 23 and an outer surface 24. The length of the sheath 20 may correspond to any length known in the art. For example, the length of the sheath 20 is in the range of 15 to 45 cm. The inner cavity 23 of the sheath 20 can be any diameter that allows an endoscope channel commonly used in lithotripsy. For example, the diameter of the inner cavity 23 can vary in the range of 3 to 8 mm or 8 to 24 Fr. Further preferably, a radiopaque interlayer (not shown in the figure) is provided on the inner wall of the sheath 20, or a radiopaque interlayer is provided on the outer wall of the sheath 20, or The wall of the sheath 20 is inlaid with a radiopaque interlayer. For example, a sandwich of radiopaque material can also be used on the outer surface 24 of the sheath 20, which can provide assistance in determining the position of the sheath 20 in the patient.

The proximal sheath 30 has a transparent or semi-transparent structure to facilitate visualization when the stone is sucked out. The first side pipe 50 is connected with a pressure adjusting mechanism 110 for adjusting pressure. The pressure adjusting mechanism 110 may be a simple slit or hole control vent, or it may be a more complicated mechanism, such as a valve. Furthermore, the pressure adjusting mechanism 110 is a slit extending along the axis of the first side tube 50 and whose opening degree can be adjusted. When no adjustment is required, the slit is in a closed state. In addition, the pressure adjusting mechanism 110 may also be a three-way valve or other types of valves to adjust the negative pressure. As shown in FIGS. 10-11, the second distal end 42 of the distal sheath 40, that is, the distal end 22 of the sheath 20, is an expandable structure 120, and the expandable structure 120 is an inflatable and deflated balloon. Or an expansion spring that can be expanded or contracted, and the expandable structure 120 can be used to collect stones, foreign bodies or target tissues in the sheath for treatment. Further, the distal end 22 of the sheath tube 20, that is, the second distal end 42 of the distal sheath tube 40, is configured in a tapered structure to facilitate the insertion of the sheath tube 20 into the body cavity of the patient. Once the distal end 22 of the sheath 20 is in place, the distal end 22 can then be expanded as needed, increasing the range and strength of the adsorption of stones or other tissues, and effectively improving the efficiency of negative pressure adsorption.

The first side tube 50 connected with the negative pressure aspirator and the proximal sheath 30 are provided with a marking band 36 above the connection point. The third distal end 52 of the first side tube 50 is connected to the proximal sheath 30. Side connection, the angle A between the first side tube 50 and the proximal sheath 30 from the connection to the first proximal end 31 is in the range of 0° to 180°, between 10° and 170°, 20° and 160° °, between 30° and 150°, between 20° and 110°, between 2° and 90°, or between 20° and 70°. Further preferably, the angle between the first side tube 50 and the direction from the connection to the first proximal end 31 of the proximal sheath 30 is 45°, or 25°, or 30°. The third proximal end 51 of the first side tube 50 is configured to be connected to a connecting tube 70. The third proximal end 51 of the first side tube 50 can be straight, flared, tapered, expandable, including but Not limited to a wire basket, guide wire, stylet, loop, grasping forceps, etc. The backflow preventer may also be attached to the third proximal end 51 of the first side tube 50 in combination. The function of the marker band 36 is that when the endoscope is placed in the sheath 20, the stones cannot be discharged smoothly due to the large size. The endoscope needs to be moved from the sheath 20 to the marker band, so that the stones or other human tissues can be removed. Smoothly drain through the first side tube 50.

As shown in FIG. 3, the second side tube 60 is a side tube that provides additional channels for supplementary flushing or guide wires, stone baskets, or other equipment that may be required during the foreign body removal process. It can also be used for the evacuation of stones or foreign bodies. Additional channel. The second side tube 60 can be located anywhere on the outer surface 34 of the proximal sheath. The second side tube 60 is formed diverging upward along the outer surface 34 of the proximal sheath 30, and the angle B with the proximal sheath 30 is in the range of 0° to 180°, between 10° and 170° , Between 20° and 160°, between 30° and 150°, between 20° and 110°, between 20° and 90°, or between 20° and 70°. Preferably, the angle is 45°, 30° or 25°. Preferably, the diameter of the inner cavity 63 of the second side tube 60 is smaller than the diameter of the first inner cavity 33 or smaller than the diameter of the second inner cavity 43. In another embodiment, the diameter of the inner cavity of the second side tube 60 is the same as or 120% of the diameter of the first inner cavity 33 or the second inner cavity 43. When the inner cavity of the second side tube 60 is Larger diameters can promote effective evacuation of stones, stone fragments or other foreign bodies. Each second side tube 60 includes a sixth proximal end 61 and a sixth distal end 62, and the sixth distal end 62 is fixed to the outer surface 34 of the proximal sheath 30. The second side tube 60 may also include a pressure adjustment mechanism 110. The pressure adjusting mechanism 110 may simply be a control vent in the form of a slit or a hole, or it may be a more complicated mechanism, such as a valve. Preferably, the pressure adjusting mechanism 110 of the second side tube 60 is a longitudinal slit along the axis of the second side tube 60, and the longitudinal slit is a controllable mechanism for controlling the ventilation opening. When minimum negative pressure is necessary, the slit remains open or minimally closed. When the negative pressure is required, the slit can be completely closed at most. Preferably, the pressure adjusting mechanism 110 can also be a three-way valve with a straight cavity 88 and a right angle cavity 89. Of course, as shown in FIGS. 4 and 5, the pressure adjustment mechanism 110 may not be added.

The second lumen 43 of the distal sheath 40 can be used for medical tools such as endoscopes, dilation tubes, stones, human tissue fragments, etc., and has an outer surface 44 and a locking member 45, as shown in FIG. 3 The locking member 45 is used to maintain a reliable connection between the distal sheath 40 and the proximal sheath 30, and the distal sheath 40 and the proximal sheath 30 can be configured as a single-piece telescopic structure. The distal sheath 40 may be straight, tapered, and expandable. The second distal end 42 of the distal sheath 40 may be flat, inclined, convex or concave, preferably, it is a flat end, preferably, the second distal end 42 of the distal sheath 40 It can be coated with a hydrophilic coating and/or polytetrafluoroethylene, especially in a body fluid environment to reduce friction. The distal sheath 40 may be opaque, translucent, transparent, or a combination of these. In a preferred embodiment, the distal sheath 40 is opaque to avoid reflection of the illumination light of the endoscope. As shown in FIG. 4, the distal sheath 40 may also have a measurement mark 46 to indicate that the length of the distal sheath 40 has been advanced into the body cavity. The length of the distal sheath 40 may be in the range of 15 to 45 cm.

In this embodiment, as shown in FIG. 3, the expansion tube 90 is an instrument of laparoscopic technology. The expansion tube 90 is made of rigid, semi-rigid or flexible material, and may have a shaft and an outer surface 94. Smooth, it is a solid structure or a structure with a hollow center. The expansion tube 90 has a fifth proximal end 91 and a fifth distal end 92, inserted from the first proximal end 31 of the proximal sheath, and inserted into the sheath 20 through the first lumen 33 and the second lumen 43. The fifth distal end 92 may be straight, rounded, tapered, or tapered. The expansion tube 90 is adapted to be closely attached to the inner wall of the sheath tube 20. Preferably, the expansion tube 90 has a hollow center forming a fifth inner cavity and a tapered fifth distal end 92, and the guide wire can be passed through the fifth inner cavity. More preferably, the expansion tube 90 is solid and the fifth distal end 92 is beveled. The fifth proximal end 91 of the expansion tube 90 can be configured as an easy-to-handle handle with a luer locking mechanism to allow attachment of a syringe. In this embodiment, a connecting mechanism 35 is provided at the interface between the expansion tube 90 and the proximal end 21 of the sheath tube 20, that is, the first proximal end 31 of the proximal sheath tube 30. The connection mechanism 35 is preferably a threaded connection mechanism or a screw connection mechanism to ensure a stable connection between the expansion tube 90 and the sheath tube 20. For example, the connection mechanism 35 is a screw and a corresponding screw hole, which allows the expansion tube 90 to be joined. After reaching the first proximal end 31 of the proximal sheath, the screw on the connecting mechanism can be removed, and the dilation tube 90 is removed from the inner cavity 23 of the sheath. For another example, the connecting mechanism 35 is performed through the luer locking mechanism of the wound expansion tube 90 and the sheath tube 20. This will prevent the expansion tube 90 from escaping from the sheath 20 and passing through the passage of the main body. The outer surface of the expansion tube 90 is provided with a scale 96, so that the insertion depth of the expansion tube 90 can be clearly observed.

In this embodiment, as shown in FIG. 3, the movable sealing cover 100 refers to the first proximal end 31 of the proximal sheath 30 configured to fit. The central opening may be self-sealing, and the movable sealing cover 100 may be made of rubber, silicone, or any material known to be acceptable in the art. A through hole 101 for the endoscope to pass through is provided in the center. When no endoscope passes through, the through hole 101 can be sealed by a sealing plug.

As shown in Figures 8 and 9, the negative pressure aspirator includes a collection container 80. The collection container 80 includes a bottle body 84 and an upper end cover 81 detachably connected to the bottle body. The height of the bottle body 84 is 1 to 4 times the height of the upper end cap body 81, preferably 1 to 3 times, and more preferably the height ratio of the upper end cap body 81 and the bottle body 84 is 3:7, using this ratio The advantage is that the stability of the collection container 80 can be improved. When the upper end cover 81 is provided with multiple components, a proper ratio of the upper end cover 81 to the bottle body 84 helps to maintain the sealing performance. The body 84 and the upper end cover body 81 are connected through a connecting piece. The choice of connecting pieces can be various. For example, a sealing ring is provided on the bottle body 84, and the upper end cover body 81 and the bottle body 84 are fitted with a receiving groove for accommodating the sealing ring. Or alternatively, the bottle body 84 and the upper end cover 81 are connected by bolts when they are sealed separately, or the bottle body 84 and the upper end cover 81 are connected by a fastenable plastic when they are sealed separately. Strap or lockable metal strip for fixed connection. The upper end cover 81 of the collection container 80 is provided with an inlet pipe 82 and an outlet pipe 83, and the inlet pipe 82 is connected to the corresponding first side pipe 50 through the connecting pipe 70. The connecting tube 70 may be any medical grade material in a rigid, semi-rigid or flexible tube. The connecting tube 70 has a connecting tube proximal end 71, a connecting tube distal end 72, and a connecting tube lumen 73. In some applications, the connecting pipe 70 is a transparent PVC pipe. The collection container 80 is a container of any shape. The inlet pipe 82 may or may not have a one-way valve to prevent fluid and other substances from flowing back into the connecting pipe 70. The outlet pipe 83 or any position along the outlet pipe 83 may be equipped with a sieve 85 similar to a mechanism for preventing small stones, foreign body fragments or other materials from flowing into the collection container 80. The inlet pipe 82 has a connecting mechanism for connecting to the connecting pipe 70. The outlet pipe 83 is connected to a standard negative pressure suction machine through an auxiliary connecting pipe 78, as shown in FIG. 10.

In this embodiment, the outlet pipe 83 is installed with a three-way valve. The straight cavity 88 of the three-way valve is connected to the negative pressure system and the right angle cavity 89 is connected to the syringe. The right-angle cavity is closed in normal operation. However, when stone fragments, blood clots, or tissue fragments block the outlet tube 83, the right-angle cavity 89 can be opened to flush the blockage with an additional syringe.

In practical applications, the movable sealing cap 100 is removed, and then the expansion tube 90 is inserted from the first proximal end 31, and locked to the proximal end 21 of the sheath 20 (that is, the first proximal end of the sheath 30) through the locking mechanism 35 On a proximal end 31), the distal sheath 40 is guided through the dilation tube 90 to the site where gravel or other human tissue fragments need to be sucked, and then the dilation tube 90 is removed, and the movable sealing cover 100 with the endoscope is installed. Cover the proximal end of the sheath 20 (that is, the first proximal end 31 of the proximal sheath 30), through the endoscope to assist in positioning and sucking gravel or other human tissue fragments, when the volume of the gravel or other human tissue fragments is larger When it is large but smaller than the diameter of the second inner cavity 43, the endoscope is drawn to the position of the marking tape, and then sucked out through negative pressure. In this process, the negative pressure is provided through a negative pressure suction device. Through the collection container 80, the problem of sucking back and blocking the standard negative pressure suction machine such as vacuum pump can be effectively avoided. It can be passed through the first side tube 50. The connected pressure adjusting mechanism 110 adjusts the pressure, the whole operation procedure is simple, the processing is easy, and it can effectively remove the gravel or tissue fragments. More importantly, the second distal end 42 of the distal sheath 40 can be The expansion structure 120 can effectively expand the removal range of crushed stones or tissue fragments, and improve the removal efficiency. By adding the second side tube 60, more equipment can be added, and it can also be used as a passage for crushed stones or tissue fragments to improve the accuracy of removing the crushed stones or tissue fragments.

Example 2

As shown in Figures 12a, 12b, 13a, and 13b, they are roughly the same as Embodiment 1, except that, in this embodiment, the outer side of the sheath 20 is provided with an auxiliary channel 130 for inserting a guide wire. The auxiliary channel 130 includes a fourth proximal end 131, a fourth distal end 132, and a fourth lumen 133. The guide wire is inserted into the fourth lumen 133. The fourth distal end 132 of the auxiliary channel 130 extends beyond the The second distal end 42 of the distal sheath, as shown in Figures 13a and 13b, or flush with the second distal end 42, as shown in Figures 12a and 12b, preferably extends beyond the second distal end 42. The excess distance is about 1 cm, 2 cm, 3 cm, or less than 5 cm. The auxiliary channel 130 helps to locate the distal end 22 of the sheath close to the stone or foreign body. In addition, the auxiliary channel 130 can also be used to guide additional flushing, catheters, foreign body baskets, backstop instruments or equipment to approach the location of stones or foreign bodies. The additional flushing, catheters, foreign body baskets, backstop instruments or equipment pass through the auxiliary channels 130 delivery.

The guide wire through the auxiliary channel 130 can assist in the precise positioning of the sheath 20 and improve the accuracy of the extraction of gravel or tissue fragments.

The above are only the preferred embodiments of this creation, and any modification, equivalent replacement and improvement made within the spirit and principle of this creation should be included in the protection scope of this creation.

10: Negative pressure suction device 20: sheath 21: Near end 22: remote 23: inner cavity 24: outer surface 30: Proximal sheath 31: first proximal 32: First remote 33: The first cavity 34: outer surface 35: connecting mechanism 36: Marker tape 40: Distal sheath 41: second proximal 42: second remote 43: second cavity 44: outer surface 45: Locking parts 46: measurement mark 50: first side tube 51: Third Near End 52: third far end 53: Third cavity 60: second side tube 61: sixth proximal 62: sixth far end 63: inner cavity 70: connecting pipe 71: proximal end of connecting tube 72: Connecting tube distal end 73: connecting tube lumen 78: auxiliary connecting pipe 80: Collection container 81: Upper end cover 82: inlet pipe 83: export pipe 84: bottle body 85: Sieve 88: straight cavity 89: Right Angle Cavity 90: expansion tube 91: Fifth Near End 92: Fifth Far End 94: outer surface 96: scale 100: movable sealing cover 101: Through hole 110: Pressure regulating mechanism 120: Expandable structure 130: auxiliary channel 131: Fourth Near End 132: Fourth remote 133: The fourth cavity A: Angle B: Angle

Figure 1 is a three-dimensional view of the sheath of the creative embodiment 1; Figure 2 is a perspective view of the sheath with marker tape of Creation Example 1; Figure 3 is a three-dimensional cross-sectional view of Creative Example 1; Figure 4 is a front view of Creative Embodiment 1; Figure 5 is a rear view of Creative Embodiment 1; Figure 6 is a top view of Creative Example 1; Figure 7 is a bottom view of Creative Embodiment 1; Figure 8 is a three-dimensional view of a negative pressure suction device of Creative Embodiment 1; Fig. 9 is a three-dimensional view of another negative pressure suction device of creative embodiment 1; Figure 10 is a cross-sectional view of the distal sheath with an expandable structure of Creative Embodiment 1; 11 is a cross-sectional view of the distal sheath with an expandable structure of Creation Embodiment 1 in an expanded condition; Figure 12a is a front view of an implementation form of Creative Embodiment 2; Figure 12b is a cross-sectional view of an implementation form of Creative Embodiment 2; Figure 13a is a front view of another form of realization of Creative Embodiment 2; Figure 13b is a cross-sectional view of another implementation form of Creative Embodiment 2.

10: Negative pressure suction device

20: sheath

24: outer surface

40: Distal sheath

50: first side tube

60: second side tube

88: straight cavity

89: Right Angle Cavity

90: expansion tube

96: scale

110: Pressure regulating mechanism

Claims (10)

A negative pressure suction device, comprising a negative pressure suction device, a dilation tube, and a hollow sheath; it is characterized in that the sheath is formed by connecting a proximal sheath and a distal sheath. The proximal end is provided with a movable sealing cover, the expansion tube can be inserted from the proximal end of the proximal sheath tube and extended to the distal end of the distal sheath tube and the expansion tube is fixed to the proximal sheath tube On; the proximal sheath is connected with at least two hollow side tubes, and the negative pressure suction device is connected to one end of the side tube away from the sheath. The negative pressure suction device according to claim 1, wherein an auxiliary channel is provided on the outer side of the sheath tube, and the sheath tube and the auxiliary channel form a double-lumen structure. The negative pressure suction device according to claim 1 or 2, wherein an expandable structure is provided at the distal end of the distal sheath. The negative pressure suction device according to claim 1, wherein the expandable structure is an air bag that can be inflated and deflated or an expansion spring that can be expanded or contracted. The negative pressure suction device according to claim 1, wherein a radiopaque interlayer is provided on the inner wall of the sheath, or a radiopaque interlayer is provided on the outer wall of the sheath, or the sheath is The wall of the tube is inlaid with a radiopaque interlayer. The negative pressure suction device according to claim 1, wherein the movable sealing cover is provided with a through hole for inserting the endoscope, and the diameter of the through hole is adapted to the outer diameter of the endoscope. The negative pressure suction device according to claim 1, wherein the inner diameter of the side tube is 0.8 to 1.2 times the diameter of the hollow portion of the proximal sheath; or the inner diameter of the side tube is the distal 0.8 to 1.2 times the diameter of the hollow part of the end sheath. The negative pressure suction device according to claim 1, wherein the side tube extends in the direction of the proximal sheath tube, and an included angle between the side tube and the proximal sheath tube is 20° to 70°. The negative pressure suction device according to claim 1, wherein the sheath tube is a rigid, semi-rigid or flexible tube, and the proximal sheath tube is a transparent or semi-transparent structure; the side connected with the negative pressure suction device A marking band is arranged above the connection between the tube and the proximal sheath; the side tube is connected with a pressure adjustment mechanism for adjusting the pressure. The negative pressure suction device according to claim 1, wherein the negative pressure suction device includes a collection container, the collection container includes a bottle body and an upper cover body detachably connected to the bottle body, and the collection container The upper end cap of the container is provided with an inlet pipe and an outlet pipe. The inlet pipe is connected to the corresponding side pipe through a connecting pipe. The outlet pipe is connected to the negative pressure generating device; the outlet pipe is connected to the outlet pipe through a three-way valve. The negative pressure generating device is connected.

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