Continuous flushing type intestinal anastomosis metal stent system

Abstract

The invention provides a continuous flushing type intestinal anastomosis metal stent system which comprises a metal stent, an inner layer membrane, an outer layer membrane, a drainage tube and a stent release device, and the metal stent is in the stent release device before being released; the metal stent is a full-bare metal stent formed by weaving nickel-titanium alloy wires, is dumbbell-shaped and comprises a head part, a tail part and a body part; the inner-layer film is arranged on the inner surface of the metal stent, the outer-layer film is arranged on the outer surface of the metal stent, and the outer-layer film and the inner-layer film corresponding to the head and the tail are attached to the metal stent into a whole; a space is formed between the inner-layer film and the outer-layer film, and a plurality of through holes communicated with the space are formed in the outer-layer film; the drainage tube is communicated with the space. After the metal stent is released, liquid secreted by an intestinal canal anastomotic stoma, intestinal mucosa, blood vessels and leakage tissue can be blocked or supported, the liquid can enter a gap between the outer-layer membrane and the inner-layer membrane through the through holes and is sucked out by negative pressure, the anastomotic stoma and the leakage can be kept clean, and healing of the anastomotic stoma and the leakage is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more particularly, to a continuously irrigated intestinal anastomosis metal stent system. Background Art

[0002] Digestive tract obstruction is relatively common clinically. According to the obstruction site, it can be divided into esophageal obstruction, gastric obstruction, duodenal obstruction, small intestine obstruction, colon obstruction, and rectal obstruction; according to the benign or malignant nature of the obstructive disease, it can be classified into benign obstruction and malignant obstruction; according to the time of occurrence of the obstruction, it can be acute obstruction, subacute obstruction, and chronic obstruction; according to the nature of the obstruction, it can be divided into mechanical obstruction, dynamic obstruction, and strangulating obstruction.

[0003] Removing the cause of obstruction, excising the diseased organ, and digestive tract anastomosis are the conventional surgical procedures for treating digestive tract obstruction. The application of staplers has made the anastomosis between organs very simple, but complications such as anastomotic leakage and bleeding are still common. For acute-phase patients, in order to reduce the incidence of complications, gastrointestinal fistula is often performed, and then digestive tract organ anastomosis and reduction are carried out after the organ edema subsides. Gastrointestinal fistula not only has cumbersome care, affects daily life and work, but also the second operation to complete digestive tract organ anastomosis and reduction will increase the patient's economic burden and physical pain again.

[0004] Fully covered nitinol metal stents have been widely used in the treatment of bile leakage. By blocking the leakage opening with the tube wall of the fully covered metal stent, the leakage of bile can be terminated, thereby promoting the healing of the leakage opening. The above-mentioned fully covered metal stents have also been applied to the treatment of digestive tract perforation and anastomotic leakage. However, under gastrointestinal peristalsis, the cylindrical fully covered metal stent is prone to displacement, losing the function of blocking the leakage opening, thereby limiting its clinical application. In order to reduce the displacement rate of the stent, the fully covered metal stent is designed in a dumbbell shape. However, the fluid secreted by the gastrointestinal mucosa and the leakage opening is easily accumulated in the middle depression of the fully covered metal stent, which is not only not conducive to the healing of the leakage opening, but also can lead to the further deterioration of anastomotic leakage.

[0005] To facilitate the drainage of the secretions accumulated in the grooves of the metal stent, VAC Stent Company has applied for a negative pressure suction stent (Patent No.: WO2024170414A1). This stent is a dumbbell-shaped fully covered metal stent, with a polyurethane sponge sleeved in the middle of the depression of the stent, and a vacuum tube between the sponge and the concave surface of the metal stent. By continuously sucking out various secretions, inflammatory mediators, and pus filtered by the polyurethane sponge through the vacuum tube, it can promote the healing of the leakage opening. However, the above-mentioned negative pressure suction stent still has the following problems: 1. The gastrointestinal mucosa adheres closely to the polyurethane sponge, and the friction between the polyurethane sponge and the gastrointestinal mucosa can cause edema of the gastrointestinal mucosa and promote the production of secretions; 2. The polyurethane sponge has a filtering effect on the liquids secreted by the gastrointestinal mucosa and the leakage opening. Blocky necrotic tissues or purulent moss will deposit on the surface and gaps of the polyurethane sponge or block the suction tube, gradually reducing the negative pressure drainage effect; 3. During the continuous negative pressure suction process, the digestive juices in the gastrointestinal tract at both ends of the stent will enter the grooves of the metal stent through the gaps between the metal stent and the gastrointestinal mucosa, and the damage of the digestive juices to the leakage opening tissue is not conducive to the closure of the leakage opening; 4. The outer sheath of the stent release device is provided with a raised protective pad, which is not conducive to the application of this stent in surgical operations. Summary of the Invention

[0006] In view of the above-mentioned technical problems, a continuous flushing type intestinal anastomosis metal stent system is provided.

[0007] The technical means adopted by the present invention are as follows:

[0008] A continuous flushing type intestinal anastomosis metal stent system, comprising: a metal stent, an inner layer film, an outer layer film, a drainage tube, and a stent release device. The metal stent is arranged in the stent release device before being released;

[0009] The metal stent is a fully naked metal stent woven from nitinol wires. The metal stent is dumbbell-shaped, including a head and a tail arranged at both ends and a body arranged in the middle. The head and the tail bulge relative to the body, and the body is a groove part arranged between the head and the tail;

[0010] The inner layer film is arranged on the inner surface of the metal stent, and the outer layer film is arranged on the outer surface of the metal stent. The outer layer film and the inner layer film corresponding to the head and the tail are integrally attached to the metal stent;

[0011] There is a space between the inner layer film and the outer layer film. Multiple through holes are provided on the outer layer film corresponding to the body part, and the multiple through holes are communicated with the space;

[0012] The drainage tube is communicated with the space.

[0013] Further, recovery wire loops are provided at both the head and the tail.

[0014] Further, the inner surface of the inner layer film is smooth, and the outer surface of the inner layer film corresponding to the body part is provided or not provided with a first protrusion.

[0015] Further, the outer surface of the outer layer film is smooth, the plurality of through holes are arranged in a criss-cross pattern, the inner surface of the outer layer film is provided or not provided with a second protrusion, and the second protrusion is located between two adjacent through holes.

[0016] Further, the drainage tube enters through the inside of the bulge on one side of the metal stent, passes through the bulge on this side and enters the space, and fits on the inner surface and / or outer surface of the metal stent; the drainage tube located in the space is arranged along the length direction of the entire groove part.

[0017] Further, the drainage tube is single or double.

[0018] Further, the single drainage tube is a suction tube. The suction tube located in the space fits on the outer surface of the metal stent. The leading end of the suction tube is connected to an external negative pressure device through a negative pressure suction joint. A plurality of first side holes are provided on the tube wall of the suction tube, and the plurality of first side holes are used to connect the suction tube and the space.

[0019] Further, the single drainage tube is a double-channel tube. The double-channel tube located in the space fits on the outer surface of the metal stent. An attraction channel and a water injection channel are provided inside the double-channel tube. A plurality of second side holes and a plurality of third side holes are provided on the tube wall of the double-channel tube. The plurality of second side holes communicate the attraction channel and the space, and the plurality of third side holes communicate the water injection channel and the space; the leading end of the double-channel tube is connected with a negative pressure suction joint and an air injection joint. The negative pressure suction joint communicates with the attraction channel and is connected to an external negative pressure device, and the air injection joint communicates with the water injection channel and is connected to an external water injection pipe.

[0020] Further, the drainage tube is double. The double drainage tubes include a suction tube and a flushing tube. Both the suction tube and the flushing tube are single-channel tubes. The suction tube is connected to an external negative pressure device through a negative pressure suction joint. The flushing tube is connected to an external water injection pipe through an air injection joint. A plurality of fourth side holes are provided on the tube wall of the suction tube, and the plurality of fourth side holes are used to connect the suction tube and the space. A plurality of fifth side holes are provided on the tube wall of the flushing tube, and the plurality of fifth side holes are used to connect the flushing tube and the space;

[0021] Inside the space, the suction tube fits on the inner surface of the metal stent, and the flushing tube fits on the outer surface of the metal stent; or the suction tube fits on the outer surface of the metal stent, and the flushing tube fits on the inner surface of the metal stent; the suction tube and the flushing tube are distributed on both sides in the diameter direction of the metal stent;

[0022] The flushing tube is in a straight line shape or a circular shape.

[0023] Furthermore, the stent releasing device includes an outer sheath tube and a pusher. The pusher is inserted into the inner part of the outer sheath tube. Before the metal stent is released, it is sleeved on the pusher and located inside the outer sheath tube.

[0024] The head end of the outer sheath tube wraps or does not wrap a silica gel protection ring, and a first handle is provided at the tail of the outer sheath tube.

[0025] The head end of the pusher is in a conical structure, and a limiting structure is provided on the tube wall of the pusher. Before the metal stent is released, it is sleeved between the conical structure and the limiting structure. A second handle is provided at the tail of the pusher.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. For the continuous flushing type intestinal anastomosis metal stent system provided by the present invention, a biological membrane is attached to the inner and outer surfaces of the fully naked metal stent, and the structure and manufacturing process are simpler.

[0028] 2. For the continuous flushing type intestinal anastomosis metal stent system provided by the present invention, the outer surface of the outer layer membrane is smooth, which can reduce the irritation of the digestive tract mucosa and reduce the generation of secretion fluid.

[0029] 3. For the continuous flushing type intestinal anastomosis metal stent system provided by the present invention, holes are provided on the outer layer membrane, and the liquid secreted by the gastrointestinal mucosa and the leakage opening can enter the gap between the outer layer membrane and the inner layer membrane through the holes and be sucked out by the negative pressure drainage tube, which can promote the healing of the anastomosis and the leakage opening.

[0030] 4. For the continuous flushing type intestinal anastomosis metal stent system provided by the present invention, a sealed space is formed between the outer layer membrane and the inner layer membrane, which can promote large pieces of pus and necrotic tissue to enter the sealed space through the holes on the outer layer membrane, and the drainage efficiency is higher.

[0031] 5. For the continuous flushing type intestinal anastomosis metal stent system provided by the present invention, multiple protrusions are provided on the inner surface of the outer layer membrane and the outer surface of the inner layer membrane. Under the extrusion of the gastrointestinal mucosa on the outer layer membrane and the extrusion of the intestinal contents on the inner layer membrane, there is still a large gap between the outer layer membrane and the inner layer membrane, and the negative pressure drainage efficiency is high. The flushing liquid can enter the suction tube through the gap, avoiding the accumulation of the flushing liquid.

[0032] 6. For the continuous flushing type intestinal anastomosis metal stent system provided by the present invention, recovery line loops are provided at both ends of the metal stent, and the metal stent can be taken out through the digestive tract by pulling the recovery line loops under endoscopy.

[0033] Based on the above reasons, the present invention can be widely promoted in the fields of medical treatment and the like. Description of the Drawings

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic structural diagram of the system of the present invention.

[0036] Figure 2 It is a schematic structural diagram of the metal stent, inner layer film, outer layer film and drainage tube of the present invention.

[0037] Figure 3 is Figure 2 a cross-sectional view of.

[0038] Figure 4 It is a schematic structural diagram of the inner layer film with the first protrusion of the present invention

[0039] Figure 5 It is a schematic structural diagram of the outer layer film with through holes and the second protrusion of the present invention.

[0040] In the figure: 1, metal stent; 21, outer sheath tube; 22, pusher; 23, silica gel protection ring; 3, inner layer film; 31, first protrusion; 4, outer layer film; 41, through hole; 42, second protrusion; 5, drainage tube. Detailed embodiments

[0041] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The following will refer to the drawings and combine with the embodiments to detail the present invention.

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the sake of convenience of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.

[0045] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present invention: the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0046] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figure is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "beneath" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations will be made for the spatial relative descriptions used herein.

[0047] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meaning, and thus should not be construed as limiting the protection scope of the present invention.

[0048] The present invention provides a continuously flushing intestinal anastomosis metal stent system, comprising: a metal stent 1, an inner layer film 3, an outer layer film 4, a drainage tube 5, and a stent releasing device. The metal stent 1 is disposed in the stent releasing device before being released; the metal stent 1 is a fully naked metal stent 1 woven from nitinol wires, and the metal stent 1 is in a dumbbell shape, including a head and a tail provided at both ends and a body provided in the middle. The head and the tail are raised relative to the body, and the body is a groove portion provided between the head and the tail; the inner layer film 3 is disposed on the inner surface of the metal stent 1, the outer layer film 4 is disposed on the outer surface of the metal stent 1, and the outer layer film 4 and the inner layer film 3 corresponding to the head and the tail are integrally bonded to the metal stent 1; there is a space between the inner layer film 3 and the outer layer film 4, and a plurality of through holes 41 are provided on the outer layer film 4 corresponding to the body, and the plurality of through holes 41 communicate with the space; the drainage tube 5 communicates with the space.

[0049] Preferably, recovery wire loops are provided at both the head and the tail.

[0050] Preferably, the inner surface of the inner layer film 3 is smooth, and the outer surface of the inner layer film 3 corresponding to the body is provided or not provided with a first protrusion 31.

[0051] Preferably, the outer surface of the outer layer film 4 is smooth, the plurality of through holes 41 are arranged in a crisscross pattern, and the inner surface of the outer layer film 4 is provided or not provided with a second protrusion 42, and the second protrusion 42 is located between two adjacent through holes 41.

[0052] Preferably, the drainage tube 5 enters through the inside of the bulge on one side of the metal stent 1, passes through the bulge on this side and enters the space, and adheres to the inner surface and / or outer surface of the metal stent 1; the drainage tube 5 located in the space is arranged along the length direction of the entire groove part.

[0053] Preferably, the drainage tube 5 is single or double.

[0054] Preferably, the single drainage tube 5 is a suction tube. The suction tube located in the space adheres to the outer surface of the metal stent 1 (the drainage tube can enter through the inside of the head on the right side of the metal stent, penetrate the inner layer membrane and metal mesh of the metal stent, and adhere to the outside of the metal mesh body part). The leading end of the suction tube is connected to an external negative pressure device through a negative pressure suction joint. A plurality of first side holes are provided on the tube wall of the suction tube, and the plurality of first side holes are used to communicate the suction tube and the space.

[0055] Preferably, the single drainage tube 5 is a double-channel tube. The double-channel tube located in the space adheres to the outer surface of the metal stent 1. An attraction channel and a water injection channel are provided inside the double-channel tube. A plurality of second side holes and a plurality of third side holes are provided on the tube wall of the double-channel tube. The plurality of second side holes communicate the attraction channel and the space, and the plurality of third side holes communicate the water injection channel and the space; the leading end of the double-channel tube is connected with a negative pressure suction joint and an air injection joint. The negative pressure suction joint communicates with the attraction channel and is connected to an external negative pressure device, and the air injection joint communicates with the water injection channel and is connected to an external water injection pipe.

[0056] Preferably, the drainage tube 5 is double. The double drainage tubes 5 include a suction tube and a flushing tube. Both the suction tube and the flushing tube are single-channel tubes. The suction tube is connected to an external negative pressure device through a negative pressure suction joint, and the flushing tube is connected to an external water injection pipe through an air injection joint. A plurality of fourth side holes are provided on the tube wall of the suction tube, and the plurality of fourth side holes are used to communicate the suction tube and the space. A plurality of fifth side holes are provided on the tube wall of the flushing tube, and the plurality of fifth side holes are used to communicate the flushing tube and the space;

[0057] Inside the space, the suction tube adheres to the inner surface of the metal stent 1, and the flushing tube adheres to the outer surface of the metal stent 1; or the suction tube adheres to the outer surface of the metal stent 1, and the flushing tube adheres to the inner surface of the metal stent 1; the suction tube and the flushing tube are distributed on both sides in the diameter direction of the metal stent 1, and are approximately symmetrically arranged; the flushing tube is linear or annular.

[0058] Preferably, the stent releasing device includes an outer sheath 21 and a pusher 22. The pusher 22 is inserted into the interior of the outer sheath 21. Before the metal stent 1 is released, it is sleeved on the pusher 22 and located inside the outer sheath 21. The head end of the outer sheath 21 wraps or does not wrap a silica gel protection ring 23, and the tail of the outer sheath 21 is provided with a first handle. The head end of the pusher 22 is in a conical structure, and a limiting structure (which can adopt the existing limiting structure) is provided on the tube wall of the pusher 22. Before the metal stent 1 is released, it is sleeved between the conical structure and the limiting structure. The tail of the pusher 22 is provided with a second handle.

[0059] After the metal stent of the present invention is released, it can block the intestinal fistula or support the intestinal anastomosis. The liquid secreted by the intestinal mucosa, blood vessels, and fistula tissues can enter the gap between the outer layer membrane and the inner layer membrane through the holes on the outer layer membrane and be sucked out by negative pressure, which can keep the anastomosis and fistula clean and promote the healing of the anastomosis and fistula. By continuously injecting saline or air into the gap between the outer layer membrane and the inner layer membrane to continuously flush the anastomotic mucosa and fistula, it can not only promote the discharge of inflammatory mediators secreted by the anastomosis and fistula, but also reduce the blockage rate of the negative pressure drainage tube, thereby accelerating the healing of the anastomosis and fistula. A gap is formed between the protrusions on the inner surface of the outer layer membrane and the protrusions on the outer surface of the inner layer membrane to keep the drainage between the outer layer membrane and the inner layer membrane unobstructed.

[0060] Use of the present invention:

[0061] 1. Treatment of digestive tract perforation or anastomotic leakage

[0062] During gastroscopy examination, when digestive tract perforation or anastomotic leakage is found, a guide wire is inserted and enters the distal digestive tract. Under the guidance of the guide wire, the present stent system is inserted. Fix the stent pusher of the stent releasing device and pull back the outer sheath. The metal stent is gradually released from the outer sheath until the metal stent is completely released. Fix the drainage tube and pull back the stent releasing device until the drainage tube is separated from the stent releasing device.

[0063] 1.1. Single suction tube

[0064] The suction tube is connected to negative pressure, and the secretions entering the gap between the outer layer membrane and the inner layer membrane can be intermittently or continuously sucked out.

[0065] 1.2. Single double-channel irrigation and drainage tube

[0066] The double-channel drainage tube is connected to a connector. Air or water is injected through the air injection connector, and the air or water enters the cavity between the inner layer membrane and the outer layer membrane. The negative pressure suction connector is connected to a negative pressure suction tube, and the air, water, and secretions between the inner layer membrane and the outer layer membrane are intermittently or continuously sucked out.

[0067] 1.3. Double single-channel irrigation and drainage tubes

[0068] An air drainage tube injects air or water through an air injection joint. The air or water flows into the cavity between the inner membrane and the outer mesh through the side holes of the drainage tube. A negative pressure suction joint is connected to a negative pressure suction tube to intermittently or continuously suck out the water and secretions in the cavity between the inner membrane and the outer membrane.

[0069] 2. Acute intestinal anastomosis

[0070] For patients with acute intestinal obstruction, after resection of the necrotic and stenotic intestinal tract, there is no need for enterostomy, and the edematous intestinal tract is directly anastomosed end to end. The intestinal wall is incised away from the anastomosis, and the stent system is inserted through the incision. The anastomosis is located in the middle of the stent. After squeezing the intestinal tracts at both ends of the anastomosis towards the middle of the stent, the stent pusher of the stent release device is fixed and the outer sheath tube is pulled back. The metal stent is gradually released from the outer sheath tube until the metal stent is completely released. The drainage tube is fixed and the stent release device is pulled back until the drainage tube is separated from the stent release device. At this time, the intestinal wall on the groove of the metal stent is in a folded state, and there is no tension at the anastomosis. The intestinal wall is fixed to the raised tube walls at both ends of the metal stent with absorbable sutures to prevent stent displacement. The absorbable sutures are fixed to the drainage tube after suturing the entire intestinal wall incision and the descending muscular layer. The drainage tube runs parallel to the intestinal wall, and the seromuscular layer is sutured to wrap the drainage tube. Finally, the drainage tube is led out through a puncture hole in the abdominal wall, and the drainage tube is sutured and fixed on the abdominal wall. Through negative pressure suction, the secretions in the gap between the inner membrane and the outer membrane are intermittently or continuously sucked out. Air or water can also be continuously injected into the gap between the inner membrane and the outer membrane to continuously dilute the secretions and promote the discharge of the secretions.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A continuously flushing type intestinal anastomosis metal stent system, characterized in that, Comprising: A metal stent (1), an inner layer membrane (3), an outer layer membrane (4), a drainage tube (5) and a stent releasing device, wherein the metal stent (1) is arranged in the stent releasing device before being released; The metal stent (1) is a fully naked metal stent (1) woven from nitinol wires. The metal stent (1) is dumbbell-shaped, including a head and a tail provided at both ends and a body provided in the middle. The head and the tail bulge relative to the body, and the body is a groove part provided between the head and the tail; The inner layer membrane (3) is arranged on the inner surface of the metal stent (1), and the outer layer membrane (4) is arranged on the outer surface of the metal stent (1). The outer layer membrane (4) and the inner layer membrane (3) corresponding to the head and the tail are integrally attached to the metal stent (1); There is a space between the inner layer membrane (3) and the outer layer membrane (4). A plurality of through holes (41) are provided on the outer layer membrane (4) corresponding to the body, and the plurality of through holes (41) communicate with the space; The drainage tube (5) communicates with the space.

2. The continuously flushing intestinal anastomosis metal stent system according to claim 1, wherein Both the head and the tail are provided with recovery wire loops.

3. The continuously flushing intestinal anastomosis metal stent system according to claim 1, characterized in that, The inner surface of the inner layer membrane (3) is smooth, and the outer surface of the inner layer membrane (3) corresponding to the body is provided or not provided with a first protrusion (31).

4. The continuous flushing type intestinal anastomosis metal stent system according to claim 1, wherein The outer surface of the outer layer membrane (4) is smooth, the plurality of through holes (41) are arranged in a crisscross pattern, the inner surface of the outer layer membrane (4) is provided or not provided with a second protrusion (42), and the second protrusion (42) is located between two adjacent through holes (41); 5. The continuously flushing intestinal anastomosis metal stent system according to claim 1, wherein The drainage tube (5) enters through the interior of the bulge on one side of the metal stent (1), passes through the bulge on that side and enters the space, and adheres to the inner surface and / or the outer surface of the metal stent (1); The drainage tube (5) located in the space is arranged along the length direction of the entire groove part.

6. The continuous flushing type intestinal anastomosis metal stent system according to claim 1, wherein The drainage tube (5) is single or double.

7. The continuously flushing intestinal anastomosis metal stent system according to claim 6, wherein The single drainage tube (5) is a suction tube. The suction tube located in the space adheres to the outer surface of the metal stent (1). The leading end of the suction tube is connected to an external negative pressure device through a negative pressure suction joint. A plurality of first side holes are provided on the tube wall of the suction tube, and the plurality of first side holes are used to communicate the suction tube and the space.

8. The continuous flushing type intestinal anastomosis metal stent system according to claim 6, wherein, The single drainage tube (5) is a dual-channel tube. The dual-channel tube located in the space adheres to the outer surface of the metal stent (1). An attraction channel and a water injection channel are provided inside the dual-channel tube. A plurality of second side holes and a plurality of third side holes are provided on the tube wall of the dual-channel tube. The plurality of second side holes communicate the attraction channel and the space, and the plurality of third side holes communicate the water injection channel and the space; the leading end of the dual-channel tube is connected with a negative pressure suction joint and an air injection joint. The negative pressure suction joint communicates with the attraction channel and is connected to an external negative pressure device, and the air injection joint communicates with the water injection channel and is connected to an external water injection pipe.

9. The continuous flushing type intestinal anastomosis metal stent system according to claim 6, wherein, The drainage tube (5) is double-rooted. The double-rooted drainage tube (5) includes a suction tube and a flushing tube. Both the suction tube and the flushing tube are single-channel tubes. The suction tube is connected to an external negative pressure device through a negative pressure suction joint, and the flushing tube is connected to an external water injection tube through an air injection joint. A plurality of fourth side holes are provided on the tube wall of the suction tube, and the plurality of fourth side holes are used to connect the suction tube and the space. A plurality of fifth side holes are provided on the tube wall of the flushing tube, and the plurality of fifth side holes are used to connect the flushing tube and the space; Inside the space, the suction tube is attached to the inner surface of the metal stent (1), and the flushing tube is attached to the outer surface of the metal stent (1); Or the suction tube is attached to the outer surface of the metal stent (1), and the flushing tube is attached to the inner surface of the metal stent (1); The suction tube and the flushing tube are distributed on both sides in the diameter direction of the metal stent (1); The flushing tube is in a straight shape or a circular shape.

10. The continuously irrigating intestinal anastomosis metal stent system according to claim 1, characterized in that, The stent releasing device includes an outer sheath tube (21) and a pusher (22). The pusher (22) is inserted into the inside of the outer sheath tube (21). Before the metal stent (1) is released, it is sleeved on the pusher (22) and is located inside the outer sheath tube (21); The head end of the outer sheath tube (21) wraps or does not wrap a silica gel protection ring (23), and a first handle is provided at the tail of the outer sheath tube (21); The head end of the pusher (22) is in a conical structure, and a limiting structure is provided on the tube wall of the pusher (22). Before the metal stent (1) is released, it is sleeved between the conical structure and the limiting structure. A second handle is provided at the tail of the pusher (22).

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