An ostomy irrigation device

Abstract

The application provides a stoma irrigation device, belonging to the field of stoma irrigation, and used for solving the problem of limited physical stimulation to the intestinal tract during stoma irrigation operation; the device comprises an insertion unit, a first liquid injection unit and a second liquid injection unit; the insertion unit comprises a first expansion piece, a second expansion piece and a flow rate adjusting piece arranged in sequence along an insertion direction; the first expansion piece is arranged, and the first liquid injection unit is used to inject gas or liquid into the first expansion piece, so that the first expansion piece is expanded, thereby fixing the insertion unit in the intestinal tract and avoiding leakage of the irrigation liquid; the second liquid injection unit is used to inject the irrigation liquid into the second expansion piece, so that the second expansion piece is expanded to actively induce intestinal peristalsis, change the traditional passive flushing mode, make the intestinal contents more easily softened and removed by peristalsis, shorten the cleaning time and improve the cleanliness; and the irrigation liquid enters the intestinal tract at a slow speed after being adjusted by the flow rate adjusting piece, so that the intestinal mucosa is protected and the discomfort of the patient is reduced.

Description

Technical Field

[0001] This invention belongs to the field of stoma irrigation, and in particular relates to a stoma irrigation device. Background Technology

[0002] A stoma typically refers to an opening created by surgically reshaping the intestines or urinary tract to expose one end of the tract through the body surface, in response to diseases of the digestive or urinary system (such as rectal cancer, bladder cancer, intestinal obstruction, etc.). This type of surgery is common after the removal of lesions in the rectum, bladder, etc., and involves relocating the excretory tract to the abdominal wall to maintain the patient's life and physiological functions. Post-surgery, patients need to wear an ostomy bag at the stoma site long-term to collect involuntary feces or urine.

[0003] For patients with transverse colostomy or sigmoid colostomy, regular stoma irrigation is often necessary to establish regular bowel habits, reduce odor, and lower the risk of peristaltic skin complications. Currently, the most commonly used irrigation method in clinical practice relies on traditional enterostomy irrigation devices, which generally include a squeezeable irrigation bag, a flexible tube connected to the irrigation bag, and a flow control valve on the tube. The tube has an insertion point at the end for inserting into the stoma and injecting irrigation fluid. During this process, the irrigation fluid primarily softens the feces in the intestines and promotes their expulsion. However, these traditional devices rely solely on the flushing and softening effects of the liquid, providing limited physical stimulation to the intestines and often failing to effectively stimulate the intestines' own peristaltic reflexes. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a stoma irrigation device to solve the problem of limited physical stimulation of the intestine during irrigation operations in the prior art.

[0005] To achieve the above and other related objectives, the present invention provides a stoma irrigation device, comprising: an insertion unit, a first injection unit, and a second injection unit; the insertion unit includes a first expansion member, a second expansion member, and a flow rate regulating member arranged sequentially along the insertion direction; the first injection unit is used to inject gas or liquid into the first expansion member to expand the first expansion member and fix it in the intestine; the second injection unit is used to inject irrigation fluid into the second expansion member to expand the second expansion member to promote intestinal peristalsis; the flow rate regulating member is in fluid communication with the second expansion member and is used to reduce the flow rate of the irrigation fluid from the second expansion member and to slowly inject the irrigation fluid into the intestine.

[0006] Optionally, the flow rate regulating element is cylindrical and has an axially extending Tesla valve channel inside; the inlet of the Tesla valve channel is in fluid communication with the second expansion element, and its outlet is used to inject the irrigation fluid into the intestine.

[0007] Optionally, the insertion unit also includes a recycling bag and a return pipe; the flow rate regulating component also includes a main return channel and at least one sub-return channel, the main return channel is connected to the lateral flow branch of the Tesla valve flow channel through the sub-return channel, and the return channel is also connected to the recycling bag through the return pipe.

[0008] Optionally, the insertion unit includes a first connector, a first elastic member, a second connector, a second elastic member, and a third connector arranged sequentially along the insertion direction; the first elastic member is connected to the first connector and the second connector, and the first connector, the first elastic member, and the second connector enclose a first expansion member having a first receiving cavity; the second elastic member is connected to the second connector and the third connector, and the first connector, the second elastic member, and the third connector enclose a second expansion member having a second receiving cavity; the first connector, the second connector, and the third connector are circular, and their hardness is greater than that of the first elastic member and the second elastic member; the return pipe includes a rigid pipe section, which passes through the first connector, the second connector, and the third connector, and is partially located within the first receiving cavity and the second receiving cavity, with one end connected to the main return channel and the other end connected to the recycling bag.

[0009] Optionally, both the first elastic element and the second elastic element are made of an elastic film.

[0010] Optionally, the first injection unit includes a first connecting tube, a first injection element, and a sealing element; one end of the first connecting tube is connected to the first receiving cavity, and the other end can be selectively connected to the first injection element or the sealing element; the first injection element is used to inject gas or liquid into the first receiving cavity through the first connecting tube to cause the first expansion element to expand; the sealing element is used to connect to the first connecting tube after the first expansion element expands to seal the first receiving cavity.

[0011] Optionally, the second injection unit includes a washing bag, a second connecting tube, a third connecting tube, a first one-way valve, a second one-way valve, a tee connector, and a second injection element; one end of the second connecting tube is connected to the washing bag, and the other end is connected to the first end of the tee connector through the first one-way valve; one end of the third connecting tube passes through the first receiving cavity and is connected to the second receiving cavity, and the other end is connected to the second end of the tee connector through the second one-way valve; the second injection element is connected to the third end of the tee connector, and is used to extract the washing liquid from the washing bag and inject it into the second receiving cavity through the third connecting tube.

[0012] Optionally, the diameter of the second connecting pipe is larger than the inlet orifice diameter of the Tesla valve flow channel.

[0013] Optionally, the recycling bag is equipped with a discharge valve, and the capacity of the recycling bag is not less than the capacity of the filling bag.

[0014] As described above, the stoma irrigation device of the present invention has at least the following beneficial effects: by setting a first expansion member and injecting gas or liquid into the first expansion member using a first injection unit, the first expansion member expands, thereby fixing the insertion unit in the intestine and preventing irrigation fluid leakage; by injecting irrigation fluid into the second expansion member through a second injection unit, the second expansion member expands, thereby actively inducing intestinal peristalsis, changing the traditional passive flushing mode, making intestinal contents easier to remove, shortening the cleaning time, and improving cleanliness; and after the irrigation fluid is regulated by a flow rate regulator, it enters the intestine, reducing patient discomfort and protecting the intestinal mucosa. Attached Figure Description

[0015] Figure 1 The diagram shown is an overall structural schematic of a stoma irrigation device according to the present invention.

[0016] Figure 2 The diagram shown is a cross-sectional view of the flow rate regulating component of a stoma irrigation device according to the present invention.

[0017] Component designation explanation: 1. Insertion unit; 11. Flow rate regulating component; 111. Tesla valve flow channel; 1111. Lateral diversion section; 112. Main return channel; 113. Sub-return channel; 12. Recovery bag; 13. Return pipe; 14. First connector; 15. First elastic component; 16. Second connector; 17. Second elastic component; 18. Third connector; a. First receiving cavity; b. Second receiving cavity; 2. First injection unit; 21. First connecting pipe; 22. First injection component; 3. Second injection unit; 31. Irrigation bag; 32. Second connecting pipe; 33. Third connecting pipe; 34. First check valve; 35. Second check valve; 36. T-connector; 37. Second injection component. Detailed Implementation

[0018] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0019] Please refer to all the accompanying drawings below. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0020] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0021] Please see Figure 1-2 The present invention provides a stoma irrigation device, including an insertion unit 1, a first injection unit 2, and a second injection unit 3.

[0022] The insertion unit 1 is designed as a slender structure suitable for insertion into an enterostomy. Along the insertion direction (i.e., from the outside towards the inside of the intestine), it is sequentially equipped with a first expansion member, a second expansion member, and a flow rate regulator 11. The first expansion member is located at the end closest to the outside and its primary function is fixation. The second expansion member is located in the middle, and its core function is to stimulate intestinal peristalsis. The flow rate regulator 11 is located at the foremost end (i.e., the distal end of the insertion) and is used to regulate the rate at which the irrigation fluid ultimately enters the intestine.

[0023] The first injection unit 2 is connected to the internal cavity of the first expansion member via a conduit, and is used to inject water or air into it. When an appropriate amount of liquid or gas is injected, the first expansion member expands, increasing its volume and thus securing itself against the intestinal wall, providing fixation and sealing. This prevents the insertion unit 1 from accidentally dislodging during irrigation and reduces the risk of irrigation fluid reflux from the stoma. Preferably, the temperature of the gas or liquid injected by the first injection unit 2 is between 36-40°C, thereby reducing patient discomfort.

[0024] The second injection unit 3 is connected to the internal cavity of the second expansion member via another conduit, for injecting an irrigation solution of a preset temperature and concentration into it. When the irrigation solution is injected, the second expansion member expands accordingly. This outward expansion force exerts a gentle, continuous physical compression and stretching stimulation on the intestinal wall surrounding it. This mechanical stimulation simulates the pressure generated by feces accumulating in the intestine, effectively stimulating the intestine's own peristaltic reflex and promoting the downward movement of intestinal contents, laying the physiological foundation for subsequent cleaning.

[0025] The flow rate regulating component 11 is directly connected to the cavity of the second expansion component through an internal flow channel. Its main function is to actively regulate the flow rate of the irrigation fluid flowing out of the second expansion component, reduce the flow rate to a smooth and stable range, and inject the irrigation fluid into the deep intestine to be cleaned at this slow speed.

[0026] This embodiment first achieves reliable fixation through the first expansion member, improving operational safety and sealing. Secondly, the expansion process of the second expansion member applies effective mechanical stimulation to the intestinal wall during the injection of irrigation fluid, actively inducing physiological intestinal peristalsis and changing the traditional passive liquid flushing mode. Finally, the flow rate regulator 11 slows down the irrigation fluid, preventing high-speed flow from impacting inflamed or fragile intestinal mucosa. Furthermore, the intestinal peristalsis ensures that the irrigation fluid within the second expansion member can be injected into the intestinal lumen through the flow rate regulator 11. This sequence of "stimulating peristalsis first, then slowly cleaning" better aligns with the physiological characteristics of the human colon, improving the cleaning efficiency of a single irrigation, reducing the amount of irrigation fluid used and operation time, and enhancing patient comfort.

[0027] The flow rate regulating element 11 is specifically designed as a cylindrical tubular structure (i.e., columnar). Its interior is not a simple straight flow channel, but rather has Tesla valve flow channels 111 extending along its axial direction (i.e., consistent with the insertion direction). The Tesla valve is a passive valve without moving parts, containing a series of specially shaped channels. Resistance is low when fluid flows in a certain direction (forward), but significantly increases in the reverse direction; here, the characteristic of significantly increased resistance in reverse flow is mainly utilized. The inlet of the Tesla valve flow channel 111 is connected to the outlet of the cavity of the second expansion element via a pipeline, ensuring that all the irrigation fluid flows through this valve, and its outlet directly faces the intestinal lumen.

[0028] In the internal structure of the flow rate regulating component 11, in addition to the Tesla valve flow channel 111, a main return channel 112 and at least one sub-return channel 113 are integrated. The main return channel 112 is arranged along the axial direction of the column. One end of the sub-return channel 113 is connected to the lateral diversion section 1111 of the Tesla valve flow channel 111, and the other end merges into the main return channel 112. The end of the main return channel 112 is connected to the external recovery bag 12 through the return pipe 13. In this way, when the irrigation fluid flows from the second expansion member through the Tesla valve flow channel 111, a portion of the fluid flows into the main return channel 112 when passing through the lateral diversion section 1111 and is collected by the recovery bag 12, avoiding excessive expansion fluid injected into the second expansion member by the second injection assembly at one time, thus increasing the burden on the intestinal lumen. Furthermore, when the injection of lavage fluid into the intestinal lumen ceases, due to intestinal peristalsis, some of the lavage fluid already injected into the intestine can, under pressure, enter the main return channel 112 through the lateral diversion section 1111 and be collected by the recovery bag 12. Optionally, a switch (not shown in the figure) can also be provided on the return tube 13 to open or close the return tube 13, thereby ensuring the retention time of the lavage fluid in the intestine after the injection of lavage fluid into the intestine stops.

[0029] To facilitate the processing of the flow rate regulating component 11, the flow rate regulating component can be made by processing half of the Tesla valve flow channel 111, the main return channel 112 and the sub-return channel of each of the two semi-cylindrical structures, and then connecting the two semi-cylindrical structures together by means of hot melt welding or bonding.

[0030] During or after slow irrigation, the diluted and flushed intestinal contents (waste fluid) can be directly introduced into the recovery bag 12 via the lateral diversion section 1111 designed on the Tesla valve flow channel 111, through the internal return channel and return pipe 13. This achieves partial synchronization or orderly connection between "infusion" and "recovery," creating a relatively closed circulation system. This greatly reduces the risk of fecal leakage during irrigation, keeps the skin around the stoma clean and dry, reduces odor emission, and simplifies the cleaning work for nursing staff.

[0031] The insertion unit 1 includes a first connector 14, a first elastic member 15, a second connector 16, a second elastic member 17, and a third connector 18 arranged sequentially along the insertion direction. These three connectors are preferably annular or circular plate-like structures, providing the main support framework for the device. Their material (such as medical-grade plastic) has a higher hardness than the first elastic member 15 and the second elastic member 17, and therefore will not deform or will deform significantly less than the first elastic member 15 and the second elastic member 17 during use. The first elastic member 15 and the second elastic member 17 can each be made of a cylindrical elastic film, such as a thin film of medical-grade silicone. The two ends of the first elastic member 15 are respectively sealed to the outer edges of the first connector 14 and the second connector 16. Thus, the first connector 14, the first elastic member 15, and the second connector 16 together form an expandable sealed cavity, i.e., a first expansion member, whose internal space is the first receiving cavity a.

[0032] The two ends of the second elastic member 17 are respectively sealed to the outer edges of the second connector 16 and the third connector 18. Thus, the second connector 16, the second elastic member 17 and the third connector 18 together enclose another expandable sealed cavity, namely the second expansion member, whose internal space is the second receiving cavity b.

[0033] The reflux tube 13 comprises a rigid tube section with high rigidity and a flexible tube section with high flexibility. The rigid tube section passes sequentially through pre-set through holes in the first connector 14, the second connector 16, and the third connector 18, and is fixedly connected to them, acting as a through-axis to secure them. A portion of the rigid tube section is located inside the first receiving cavity a and the second receiving cavity b. The front end of the rigid tube section (near the intestine) communicates with the main reflux channel 112 inside the flow rate regulator 11, while the rear end connects to the externally located flexible tube section, which in turn communicates with the recovery bag 12.

[0034] This embodiment designs the two expansion components as modules composed of annular connectors and elastic elements, resulting in a clear structure that is easy to assemble and manufacture. The high rigidity of the annular connectors ensures the overall structural stability of the device, facilitating insertion and positioning. The elastic elements surrounding the connectors are responsible for achieving flexible and controllable expansion. In particular, designing the rigid section of the return pipe 13 as the central axis running through all connectors offers several advantages: First, it provides crucial structural strength and guiding support for the entire insertion unit 1, preventing bending and folding within the intestine; second, it cleverly integrates the recovery channel internally, without adding extra complexity to the external piping, making the device more regular in shape and easier to insert; third, the rigid section is located within the receiving cavity but does not affect the free expansion of the elastic elements, achieving efficient space utilization.

[0035] The first injection unit 2 specifically includes a first connecting tube 21, a first injection element 22 (such as a syringe), and a sealing element (such as a screw cap or Luer connector cap with a sealing gasket). One end of the first connecting tube 21 communicates with the first receiving cavity a of the first expansion element. The other end is provided with a standard medical interface (such as a Luer connector), which can be selectively connected to the outlet of the first injection element 22 or to the sealing element.

[0036] After inserting the device, the operator first connects the first injection element 22 (with an appropriate amount of sterile saline or air drawn) to the first connecting tube 21. Pushing the syringe piston injects the contents through the first connecting tube 21 into the first receiving cavity a, causing the first expansion element to expand until it achieves a stable fixation effect within the intestine. Then, the first injection element 22 is disconnected, and the sealing element is immediately connected to the interface of the first connecting tube 21 and tightened, thereby completely sealing the first receiving cavity a, locking in the internal liquid or gas, and maintaining the expansion state of the first expansion element. Through the design of the first injection element 22 and the sealing element, the functions of "injection" and "pressure maintenance" are separated: the syringe can be removed after the injection task is completed, avoiding the inconvenience of carrying a syringe for subsequent operations; while the sealing element provides a more durable and reliable seal, ensuring that the first expansion element remains in an expanded and fixed state throughout the irrigation process, without leakage or collapse, ensuring the safety and effectiveness of the operation.

[0037] The second injection unit 3 is used to transfer and inject the irrigation fluid. It includes: an irrigation bag 31 containing the irrigation fluid; a second connecting pipe 32 connected to the outlet of the irrigation bag 31; a third connecting pipe 33 connected to the second receiving cavity b of the second expansion member; a first one-way valve 34 installed on the second connecting pipe 32; a second one-way valve 35 installed on the third connecting pipe 33; a three-way connector 36; and a second injection device 37 (such as a syringe or manual pump). One end of the second connecting pipe 32 is connected to the irrigation bag 31, and the other end, after passing through the first one-way valve 34, is connected to the first end of the three-way connector 36. The conduction direction of the first one-way valve 34 is from the irrigation bag 31 to the three-way connector 36. One end of the third connecting pipe 33 passes through the first receiving cavity a of the first expansion member (but does not communicate with it), enters and communicates with the second receiving cavity b of the second expansion member, and the other end, after passing through the second one-way valve 35, is connected to the second end of the three-way connector 36. The conduction direction of the second one-way valve 35 is from the three-way connector 36 to the second receiving cavity b. The second injection piece 37 is connected to the third end of the tee connector 36.

[0038] During use, when the operator pulls back the piston, under negative pressure, the flushing fluid in the flushing bag 31 overcomes the resistance of the first one-way valve 34, is drawn into the second connecting pipe 32, and flows to the three-way connector 36; simultaneously, the second one-way valve 35 prevents backflow from the third connecting pipe 33. When the piston is pushed, the pressure forces the flushing fluid to flow only from the three-way connector 36 to open the second one-way valve 35, and injects it into the second receiving chamber b through the third connecting pipe 33, while the first one-way valve 34 closes at this time, preventing the liquid from flowing back into the flushing bag 31. This cycle continues, thus "pumping" the flushing fluid from the flushing bag 31 into the second expansion member.

[0039] This embodiment uses a combination of dual one-way valves and a three-way connector 36 to form a simple yet reliable manual pump module. This ensures that the liquid flows unidirectionally along the path of "washing bag 31 → three-way connector 36 → second expansion member," preventing backflow and contamination. This design allows the operator to inject liquid into the second expansion member at a controlled rhythm and volume, thereby precisely controlling the intensity of its expansion stimulation on the intestines.

[0040] In this embodiment, the diameter (inner diameter) of the second connecting pipe 32 is larger than the inlet orifice diameter of the Tesla valve flow channel 111.

[0041] The second connecting pipe 32 serves as the main supply line for the flushing fluid from the bag to the pump. Its larger diameter significantly reduces flow resistance, ensuring that the second injection element 37 can easily, smoothly, and efficiently draw the flushing fluid, making it easier for the user. Meanwhile, the inlet orifice of the Tesla valve flow channel 111 is relatively small, ensuring that most of the flushing fluid first expands the second expansion element before flowing through the Tesla valve flow channel 111. This combination of a "large supply line and a small flow-limiting inlet" optimizes the balance between fluid delivery efficiency and end-point flow rate control, ensuring precise, slow-speed injection at the end point while maintaining sufficient supply.

[0042] The recycling bag 12 is equipped with a discharge valve (such as a rotary valve or a pinch valve, not shown in the figure). The design capacity of the recycling bag 12 is not less than that of the rinsing bag 31. This allows for convenient and clean discharge of the collected waste liquid into the toilet or waste bin after rinsing, without needing to open the bag, making operation simple and hygienic. The fact that the recycling bag 12 has a capacity not less than that of the rinsing bag 31 ensures that even if all the rinsing fluid injected at once, along with some of the original contents of the intestines, is recovered, the recycling bag 12 still has sufficient capacity to hold it, effectively preventing leakage, backflow, or pipe blockage due to overfilling, ensuring the smoothness and safety of the entire recycling process.

[0043] General usage instructions: First, the insertion unit 1, in its unexpanded and compacted state, is gently inserted into the intestine to an appropriate depth through the stoma. Then, the first injection unit 2 injects a medium into the first expansion member to inflate it, securing the insertion unit firmly within the intestine and sealing the interface. Next, the second injection unit 3 is operated to pump irrigation fluid from the irrigation bag 31 into the second expansion member, causing it to expand and stimulate intestinal peristalsis; simultaneously, the irrigation fluid is slowly injected deep into the intestine via the flow rate regulator 11 for cleaning. During or after the cleaning process, waste fluid can be guided into the recovery bag 12 through the return channel and return pipe 13 within the flow rate regulator 11. Finally, the medium within the first expansion member is discharged through the first injection unit 2 to cause it to contract, allowing the insertion unit 1 to be gently removed as a whole. The discharge valve of the recovery bag 12 is opened to dispose of the waste fluid.

[0044] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0045] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A stoma irrigation device, characterized in that, include: Insertion unit (1), first injection unit (2), and second injection unit (3); The insertion unit (1) includes a first expansion member, a second expansion member, and a flow rate regulating member (11) arranged sequentially along the insertion direction. The first injection unit (2) is used to inject gas or liquid into the first expansion member so that the first expansion member expands and is fixed in the intestine; The second injection unit (3) is used to inject irrigation fluid into the second expansion member so that the second expansion member expands to promote intestinal peristalsis; The flow rate regulating element (11) is in fluid communication with the second expansion element and is used to reduce the flow rate of the irrigation fluid from the second expansion element and to slowly inject the irrigation fluid into the intestine.

2. The stoma irrigation device according to claim 1, characterized in that: The flow rate regulating member (11) is cylindrical and has an axially extending Tesla valve channel (111) inside. The inlet of the Tesla valve channel (111) is in fluid communication with the second expansion member, and its outlet is used to inject the irrigation fluid into the intestine.

3. The stoma irrigation device according to claim 2, characterized in that: The insertion unit (1) also includes a recycling bag (12) and a return pipe (13); The flow rate regulating component (11) also includes a main return channel (112) and at least one return sub-channel (113). The main return channel (112) is connected to the lateral diversion section (1111) of the Tesla valve flow channel (111) through the return sub-channel (113). The return channel is also connected to the recycling bag (12) through the return pipe (13).

4. The stoma irrigation device according to claim 3, characterized in that: The insertion unit (1) further includes a first connector (14), a first elastic member (15), a second connector (16), a second elastic member (17) and a third connector (18) arranged sequentially along the insertion direction. The first elastic member (15) is connected to the first connector (14) and the second connector (16), and the first connector (14), the first elastic member (15) and the second connector (16) together form a first expansion member having a first receiving cavity (a); The second elastic member (17) is connected to the second connector (16) and the third connector (18), and the first connector (14), the second elastic member (17) and the third connector (18) together form a second expansion member having a second receiving cavity (b); The first connector (14), the second connector (16) and the third connector (18) are circular and their hardness is greater than that of the first elastic element (15) and the second elastic element (17); The return pipe (13) includes a rigid pipe section that passes through the first connector (14), the second connector (16) and the third connector (18), and is partially located in the first receiving cavity (a) and the second receiving cavity (b). One end of the rigid pipe section is connected to the main return channel (112), and the other end is connected to the recycling bag (12).

5. The stoma irrigation device according to claim 4, characterized in that: Both the first elastic element (15) and the second elastic element (17) are made of elastic film.

6. The stoma irrigation device according to claim 4, characterized in that: The first injection unit (2) includes a first connecting tube (21), a first injection element (22), and a sealing element; One end of the first connecting tube (21) is connected to the first receiving cavity (a), and the other end can be selectively connected to the first injection piece (22) or the sealing piece; The first injection element (22) is used to inject gas or liquid into the first receiving cavity (a) through the first connecting tube (21) to cause the first expansion element to expand; The closure is used to connect to the first connecting pipe (21) after the first expansion member has expanded to close the first receiving cavity (a).

7. The stoma irrigation device according to claim 4, characterized in that: The second injection unit (3) includes a washing bag (31), a second connecting tube (32), a third connecting tube (33), a first one-way valve (34), a second one-way valve (35), a three-way connector (36), and a second injection piece (37). One end of the second connecting pipe (32) is connected to the irrigation bag (31), and the other end is connected to the first end of the three-way connector (36) through the first one-way valve (34); One end of the third connecting pipe (33) passes through the first receiving cavity (a) and communicates with the second receiving cavity (b), and the other end is connected to the second end of the three-way connector (36) through the second one-way valve (35); The second injection element (37) is connected to the third end of the three-way connector (36), which is used to extract the irrigation fluid from the irrigation bag (31) and inject it into the second receiving cavity (b) through the third connecting tube (33).

8. The stoma irrigation device according to claim 7, characterized in that: The diameter of the second connecting pipe (32) is larger than the inlet orifice diameter of the Tesla valve flow channel (111).

9. The stoma irrigation device according to claim 7, characterized in that: The recycling bag (12) is equipped with a discharge valve, and the capacity of the recycling bag (12) is not less than the capacity of the washing bag (31).

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