Enema device for preventing reflux of enema liquid

Abstract

The present invention relates to the field of medical device technology, and discloses an enema device for preventing backflow of enema liquid, comprising an enema bag, a catheter and an anal cannula, wherein the catheter is connected to the bottom of the enema bag, a cannula assembly is fixedly installed at the bottom end of the catheter, a sleeve assembly is fixedly installed at one end of the anal cannula opening, the cannula assembly is threadedly connected to the sleeve assembly, the bottom end of the anal cannula is sealed, an array of drainage holes are opened on the circumferential surface of the bottom end of the anal cannula, and an anti-backflow assembly is fixedly installed in the upper half of the anal cannula. The enema liquid flows from right to left along the square channel, and after being diverted by the V-shaped end of the guide block, part of the liquid continues to flow along the square channel, and the other part of the liquid flows through the U-shaped groove. After the liquid passes through the U-shaped groove, the flow direction changes, and convection is generated with the liquid inside the square channel, thereby slowing down the flow speed of the liquid inside the square channel, thereby achieving the purpose of preventing the enema liquid from flowing back to the inside of the enema device.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to an enema device for preventing backflow of enema liquid. Background Art

[0002] An enema is a medical device consisting of a liquid storage container, a catheter, and an anal canal. Made of polymer materials, it's primarily used for clinical enema administration. By inserting the anal canal into the anus and suspending the liquid storage container at a high altitude, the enema liquid enters the intestines through gravity and manual compression.

[0003] During enema administration, reflux can easily occur due to factors such as intestinal blockage, the patient's own intestinal motility disorders, body positioning during enema administration, the choice and insertion depth of the enema tube, and the temperature and volume of the enema solution. During reflux, the enema solution and intestinal fluids can enter the anal canal, contaminating the canal and catheter. Conventional enema devices lack reflux prevention mechanisms, which could be improved. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the shortcomings of the existing technology, the present invention provides an enema device for preventing the backflow of enema liquid, which has the advantages of preventing the enema liquid from flowing back into the enema device, and solves the problem that the backflow occurs during enema and the conventional enema device does not have an anti-backflow structure.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned purpose of preventing enema liquid from flowing back into the enema device, the present invention provides the following technical solution: an enema device for preventing enema liquid from flowing back, comprising an enema bag, a catheter and an anal cannula, the catheter being connected to the bottom of the enema bag, a cannula assembly being fixedly mounted on the bottom end of the catheter, a sleeve assembly being fixedly mounted on one end of the anal canal opening, the cannula assembly being threadedly connected to the sleeve assembly, the bottom end of the anal canal being sealed, drainage holes being formed in an array on the circumferential surface of the bottom end of the anal canal, and an anti-backflow assembly being fixedly mounted in the upper half of the anal canal.

[0008] Preferably, a Morse dropper is integrally formed on the conduit, and a speed regulator is provided on the conduit.

[0009] Preferably, an embedded tube is provided in the tail end of the anal canal, the axis of the embedded tube coincides with the axis of the anal canal, a bell mouth is integrally formed at the right end of the embedded tube, a spacer ring is fixedly installed on the outer wall of the left end of the embedded tube, a spiral rubber sheet is fixed in an array on the outer wall of the embedded tube, the bell mouth, the spacer ring and the spiral rubber sheet are fixed on the inner wall of the anal canal, and a tapered ring is fixed in an array on the inner wall of the embedded tube along its length direction; a drainage cavity is enclosed between the spacer ring and the tail end of the embedded tube, and the drainage hole is connected to the drainage cavity.

[0010] Preferably, the cannula assembly includes a blocking piece fixedly mounted on the bottom end of the catheter, an externally threaded tube fixedly mounted on the bottom end of the blocking piece, a cannula body fixedly mounted on the bottom end of the externally threaded tube, the blocking piece, the externally threaded tube and the cannula body have the same inner diameter as the catheter, the outer diameter of the blocking piece is larger than the outer diameter of the externally threaded tube, and the outer diameter of the externally threaded tube is larger than the outer diameter of the cannula body.

[0011] Preferably, the sleeve assembly includes a sleeve body fixedly mounted on the top end of the anal canal, a retaining ring 1 is fixedly mounted on the outer wall of the top end of the sleeve body, a retaining ring 2 is fixedly mounted on the outer wall of the bottom end of the sleeve body, and an annular support is fixedly mounted on the inner wall of the lower half of the sleeve body; the cannula body is inserted into the upper half of the sleeve body and fits on the top of the annular support, the outer diameter of the cannula body is equal to the inner diameter of the sleeve body, the inner diameter of the cannula body is equal to the inner diameter of the annular support, and the externally threaded tube abuts against the top of the retaining ring 1; a sleeve is provided on the outer side of the sleeve body and the retaining ring 1, a nut is fixedly mounted on the top of the sleeve, and the nut is threadedly connected to the externally threaded tube.

[0012] Preferably, a sliding ring is sleeved on the outer side of the sleeve body, and sliding columns are fixed in an array on the inner wall of the sliding ring, and a valve tube is fixedly installed between the sliding columns; a sliding groove is opened in an array on the circumferential surface of the lower half of the sleeve body, and the sliding groove passes through the annular support, the sliding columns correspond to the sliding grooves one by one, and the sliding columns are slidably connected in the sliding grooves; the valve tube is slidably connected in the annular support, the outer diameter of the valve tube is equal to the inner diameter of the annular support, and a sealing plug is fixedly installed on the inner wall of the bottom end of the annular support, and the sealing plug is used to seal the bottom end of the valve tube, and a water leakage groove is opened on the sealing plug; a spring is fixed in an array between the top of the sliding ring and the bottom of the retaining ring.

[0013] Preferably, the sealing plug includes a valve core, a support plate and a support rod. The valve core is in the shape of a cone. The inner wall of the bottom end of the valve tube is adapted to the circumferential surface of the valve core. The support plate is fixedly installed at the bottom of the valve core, and the support rod array is fixed between the circumferential surface of the support plate and the inner wall of the annular support.

[0014] Preferably, the anti-backflow component includes a reinforcing tube fixedly installed in the upper half of the anal canal, a square channel is opened through the center of the reinforcing tube, the square channel is arranged along the axis direction of the reinforcing tube, V-shaped openings are opened at both ends of the reinforcing tube, the V-shaped openings are connected to the square channel, and U-shaped grooves are opened in an array on the top wall and bottom wall of the reinforcing tube located in the square channel, the U-shaped grooves are U-shaped and inclined to the left, and guide blocks are fixed in an array between the front and rear side walls of the square channel.

[0015] Preferably, the left half of the guide block cross section is C-shaped, and the right half of the guide block cross section is V-shaped. When the liquid in the square channel flows from right to left, the guide block is used to divert the liquid to the inside of the U-shaped groove.

[0016] (3) Beneficial effects

[0017] Compared with the prior art, the present invention provides an enema device for preventing backflow of enema liquid, which has the following beneficial effects:

[0018] 1. The enema device for preventing backflow of enema liquid, the enema liquid enters the anal canal through the drainage hole, and then flows from left to right along the embedded tube. The enema liquid is blocked by multiple conical rings to suppress the backflow of the enema liquid; thereby suppressing the relatively mild backflow of the enema liquid; when the backflow effect is large, the enema liquid flows from right to left along the square channel, and after being diverted by the V-shaped end of the guide block, part of the liquid continues to flow along the square channel, and the other part of the liquid flows through the U-shaped groove. After the liquid passes through the U-shaped groove, the flow direction changes, and convection is generated with the liquid inside the square channel, thereby slowing down the flow speed of the liquid inside the square channel. By arranging multiple U-shaped grooves and guide blocks in an array, the liquid in the square channel is decelerated multiple times, thereby avoiding the backflow of the enema liquid; thereby achieving the purpose of preventing the enema liquid from flowing back into the enema device;

[0019] 2. The enema device for preventing backflow of enema liquid has a tendency to move downward by the elasticity of the spring, so that the valve tube fits on the surface of the valve core, thereby sealing the annular support through the cooperation of the valve tube and the valve core to prevent the interior of the anal canal from being contaminated;

[0020] 3. This enema device, which prevents backflow of enema liquid, uses a spiral rubber sheet to strengthen the end of the anal canal while still allowing it to bend, preventing intestinal peristalsis and other factors from squeezing the end of the anal canal excessively and affecting the flow of the enema liquid. The tapered ring ensures smooth flow of the enema liquid from right to left, while encountering greater resistance when flowing from left to right. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of an enema device for preventing backflow of enema liquid proposed by the present invention;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of an enema device for preventing backflow of enema liquid proposed by the present invention with the enema bag removed;

[0023] Figure 3 This is a schematic diagram of the three-dimensional cross-section structure of an enema device for preventing backflow of enema liquid proposed by the present invention with the enema bag removed;

[0024] Figure 4 This is a schematic diagram of the main cross-sectional structure of the anal canal tail end of an enema device for preventing enema liquid backflow proposed by the present invention;

[0025] Figure 5 This is a schematic diagram of the three-dimensional structure of the anal canal tail end of an enema device for preventing backflow of enema liquid proposed by the present invention;

[0026] Figure 6 This is a schematic diagram of the main cross-sectional structure of the cannula assembly and sleeve assembly of an enema device for preventing enema liquid backflow proposed by the present invention;

[0027] Figure 7 This is a schematic diagram of the three-dimensional structure of the cannula assembly and sleeve assembly of the enema device for preventing enema liquid backflow proposed by the present invention;

[0028] Figure 8 This is a schematic diagram of the three-dimensional structure of the sleeve assembly of an enema device for preventing backflow of enema liquid proposed by the present invention;

[0029] Figure 9 This is a schematic diagram of a three-dimensional cross-sectional structure of a sleeve assembly of an enema device for preventing backflow of enema liquid proposed by the present invention;

[0030] Figure 10 This is a schematic diagram of the structure of the sliding ring and valve tube of an enema device for preventing backflow of enema liquid proposed by the present invention;

[0031] Figure 11 The present invention provides a schematic diagram of the main cross-sectional structure of an anti-reflux component of an enema device for preventing backflow of enema liquid.

[0032] In the figure: 100, enema bag; 200, catheter; 300, anal cannula; 400, cannula assembly; 500, sleeve assembly; 600, drainage hole; 700, anti-backflow assembly; 201, Morse dropper; 202, speed regulator; 301, embedded tube; 302, bell mouth; 303, spacer ring; 304, spiral rubber sheet; 305, tapered ring; 401, blocking sheet; 402, externally threaded tube; 403, cannula body; 5 01. Sleeve body; 502. Retaining ring 1; 503. Retaining ring 2; 504. Ring support; 505. Sleeve; 506. Nut; 507. Sliding ring; 508. Sliding column; 509. Valve pipe; 510. Slide groove; 511. Spring; 512. Valve core; 513. Support plate; 514. Support rod; 701. Reinforcement pipe; 702. Square channel; 703. V-shaped mouth; 704. U-shaped groove; 705. Guide block. DETAILED DESCRIPTION

[0033] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 3 An enema device for preventing backflow of enema liquid includes an enema bag 100, a catheter 200, and an anal canal 300. The catheter 200 is connected to the bottom of the enema bag 100 and has a Morse dropper 201 integrally formed thereon. A speed regulator 202 is also provided on the catheter 200. A cannula assembly 400 is fixedly mounted at the bottom end of the catheter 200, and a cannula assembly 500 is fixedly mounted at the open end of the anal canal 300. The cannula assembly 400 and the cannula assembly 500 are threadedly connected. The bottom end of the anal canal 300 is sealed, and drainage holes 600 are arranged in an array throughout the circumference of the bottom end of the anal canal 300. A backflow prevention assembly 700 is fixedly mounted within the upper half of the anal canal 300. The backflow prevention assembly 700 blocks backflowing liquid and prevents it. Furthermore, the placement of the backflow prevention assembly 700 at the patient's anus prevents the anal canal 300 from being squeezed excessively due to patient non-cooperation, which could affect the stability of the anal canal 300 in delivering the enema liquid.

[0036] See also Figure 4-Figure 5 An embedded tube 301 is disposed within the rear end of the anal canal 300. The axis of the embedded tube 301 coincides with the axis of the anal canal 300. A bell-shaped opening 302 is integrally formed at the right end of the embedded tube 301. A spacer ring 303 is fixedly mounted on the outer wall of the left end of the embedded tube 301. The bell-shaped opening 302, spacer ring 303, and spiral rubber sheet 304 are fixedly mounted on the inner wall of the anal canal 300. The spacer ring 303 and the rear end of the embedded tube 301 form a drainage cavity, which is connected to the drainage hole 600. Thus, enema fluid within the anal canal 300 can enter the embedded tube 301 through the bell-shaped opening 302, then into the drainage cavity, and finally into the patient's intestines through the drainage hole 600. A spiral rubber sheet 304 is fixed in an array on the outer wall of the inner tube 301, and a tapered ring 305 is fixed in an array along its length on the inner wall of the inner tube 301. The spiral rubber sheet 304 strengthens the end of the anal canal 300 while still allowing it to bend, preventing intestinal peristalsis and other factors from exerting excessive pressure on the end of the anal canal 300 and affecting the flow of the enema liquid. The tapered ring 305 ensures smooth flow of the enema liquid from right to left, while encountering greater resistance when flowing from left to right.

[0037] See also Figure 6-Figure 7 The cannula assembly 400 includes a blocking piece 401 fixedly installed at the bottom end of the catheter 200, an external threaded tube 402 fixedly installed at the bottom end of the blocking piece 401, and a cannula body 403 fixedly installed at the bottom end of the external threaded tube 402. The blocking piece 401, the external threaded tube 402 and the cannula body 403 have the same inner diameter as the catheter 200, the outer diameter of the blocking piece 401 is larger than the outer diameter of the external threaded tube 402, and the outer diameter of the external threaded tube 402 is larger than the outer diameter of the cannula body 403.

[0038] See also Figures 6-10 The sleeve assembly 500 includes a sleeve body 501 fixedly mounted on the top end of the anal canal 300, a retaining ring 502 is fixedly mounted on the outer wall of the top end of the sleeve body 501, a retaining ring 2 503 is fixedly mounted on the outer wall of the bottom end of the sleeve body 501, and an annular support 504 is fixedly mounted on the inner wall of the lower half of the sleeve body 501; the cannula body 403 is inserted into the upper half of the sleeve body 501 and fits on the top of the annular support 504, the outer diameter of the cannula body 403 is equal to the inner diameter of the sleeve body 501, and the inner diameter of the cannula body 403 is equal to the inner diameter of the annular support 504, and the external threaded tube 402 abuts against the top of the retaining ring 502; a sleeve 505 is provided on the outside of the sleeve body 501 and the retaining ring 1 502, and a nut 506 is fixedly mounted on the top of the sleeve 505, and the nut 506 is threadedly connected to the external threaded tube 402. The cannula body 403 is inserted into the interior of the sleeve body 501 , and the sleeve 505 is screwed to connect the nut 506 to the external threaded tube 402 , so that the cannula assembly 400 and the sleeve assembly 500 are stably connected together.

[0039] See also Figures 6-10 A sliding ring 507 is sleeved on the outside of the sleeve body 501. The inner diameter of the sliding ring 507 is equal to the outer diameter of the sleeve body 501, and the outer diameter of the sliding ring 507 is equal to the inner diameter of the sleeve 505. Sliding posts 508 are fixed to the inner wall of the sliding ring 507. Valve tubes 509 are fixedly installed between the sliding posts 508. The length of the valve tube 509 and the sliding ring 507 are equal.

[0040] The lower circumference of the sleeve body 501 is formed with an array of sliding grooves 510 extending through the annular support 504. Sliders 508 correspond to and slide within the grooves 510. A valve tube 509 slides within the annular support 504. The outer diameter of the valve tube 509 matches the inner diameter of the annular support 504. Furthermore, the length of the valve tube 509 and the sliding ring 507 is greater than twice the length of the grooves 510. As the sliders 508 slide within the grooves 510, the valve tube 509 and the sliding ring 507 maintain a constant seal against the grooves 510.

[0041] A sealing plug is fixedly mounted on the inner wall of the bottom end of the annular support 504. This plug seals the bottom end of the valve tube 509 and has a water leakage groove running through it. Springs 511 are fixed in an array between the top of the sliding ring 507 and the bottom of the first retaining ring 502. The elasticity of the springs 511 causes the sliding ring 507 to move downward. Initially, the sliding ring 507 rests on the bottom wall of the sleeve 505, the bottom of the sleeve 505 rests on the top of the second retaining ring 503, the top of the sleeve 505 rests on the top of the first retaining ring 502, and the sliding post 508 rests on the bottom wall of the sliding groove 510. At this point, the sealing plug seals the bottom end of the valve tube 509.

[0042] See also Figures 6-10 The sealing plug includes a valve core 512, a support plate 513, and support rods 514. The valve core 512 is truncated, and the inner wall of the bottom end of the valve tube 509 matches the circumference of the valve core 512. The support plate 513 is fixedly mounted on the bottom of the valve core 512, and the support rods 514 are fixed in an array between the circumference of the support plate 513 and the inner wall of the annular support 504. The gaps between the support rods 514 form a water leakage channel. When the valve tube 509 moves upward, the valve tube 509 separates from the valve core 512, allowing the enema liquid to pass through the valve tube 509 and the gaps between the support rods 514 into the interior of the anal canal 300.

[0043] See also Figure 3 and Figure 11The anti-backflow assembly 700 includes a reinforcing tube 701 fixedly installed in the upper half of the anal canal 300. A square channel 702 is provided through the center of the reinforcing tube 701. The square channel 702 is arranged along the axis of the reinforcing tube 701. V-shaped openings 703 are provided at both ends of the reinforcing tube 701. The V-shaped openings 703 are connected to the square channel 702. U-shaped grooves 704 are provided in an array on the top and bottom walls of the reinforcing tube 701 located in the square channel 702. The U-shaped grooves 704 are U-shaped and tilted to the left. A guide block 705 is fixed in an array between the front and rear side walls of the square channel 702. The wall thickness of the anti-backflow assembly 700 is greater than the wall thickness of the anal canal 300, thereby enhancing the strength of the anti-backflow assembly 700. This prevents the patient's anus from squeezing the anti-backflow assembly 700 too much, causing deformation of the anti-backflow assembly 700.

[0044] See also Figure 11 The left half of the cross-section of the guide block 705 is C-shaped, and the right half of the cross-section of the guide block 705 is V-shaped. When the liquid in the square channel 702 flows from right to left, the guide block 705 is used to divert the liquid into the U-shaped groove 704. Therefore, when the enema liquid flows back, the liquid flows from right to left. After being diverted by the V-shaped end of the guide block 705, part of the liquid continues to flow along the square channel 702, while the other part flows through the U-shaped groove 704. After the liquid passes through the U-shaped groove 704, the flow direction changes, and convection is generated with the liquid in the square channel 702, thereby slowing the flow rate of the liquid in the square channel 702. By arranging multiple U-shaped grooves 704 and guide blocks 705 in an array, the liquid in the square channel 702 is decelerated multiple times, thereby preventing the enema liquid from flowing back.

[0045] When the enema liquid is normally injected into the intestine, the enema liquid in the square channel 702 flows from left to right. Even if the enema liquid enters the U-shaped groove 704, when the enema liquid passes through the U-shaped groove 704 and enters the square channel 702 again, the enema liquid flows in the same direction, ensuring that the enema can be carried out normally.

[0046] During use, the elasticity of the spring 511 causes the sliding ring 507, the sliding post 508 and the valve tube 509 to move downward, so that the valve tube 509 is attached to the surface of the valve core 512. The valve tube 509 and the valve core 512 cooperate to seal the annular support 504, thereby preventing the interior of the anal canal 300 from being contaminated.

[0047] During enema administration, the cannula body 403 is inserted into the sleeve body 501, and the sleeve 505 is screwed to thread the nut 506 onto the externally threaded tube 402, thereby stably connecting the cannula body 403 and the sleeve body 501. During this process, the sleeve 505 moves upward, thereby pushing the sliding ring 507, the sliding column 508, and the valve tube 509 to move upward, thereby separating the valve tube 509 from the valve core 512. The enema liquid can smoothly pass through the cannula assembly 400 and the sleeve assembly 500 into the interior of the anal canal 300, and finally be delivered to the interior of the intestine through the drainage hole 600.

[0048] When reflux occurs, the enema liquid enters the anal canal 300 through the drainage hole 600 and then flows from left to right along the embedded tube 301. The enema liquid is blocked by the multiple conical rings 305 to inhibit reflux of the enema liquid.

[0049] When the backflow effect is strong, the enema liquid flows from right to left along the square channel 702. After being diverted by the V-shaped end of the guide block 705, part of the liquid continues to flow along the square channel 702, while the other part flows through the U-shaped groove 704. After passing through the U-shaped groove 704, the flow direction of the liquid changes, and convection is generated with the liquid inside the square channel 702, thereby slowing down the flow speed of the liquid inside the square channel 702. By arranging multiple U-shaped grooves 704 and guide blocks 705 in an array, the liquid in the square channel 702 is decelerated multiple times, thereby preventing the backflow of the enema liquid.

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An enema device for preventing backflow of enema liquid, comprising an enema bag (100), a catheter (200) and an anal canal (300), wherein the catheter (200) is connected to the bottom of the enema bag (100), and is characterized in that: The bottom end of the catheter (200) is fixedly mounted with an intubation assembly (400), and one end of the opening of the anal canal (300) is fixedly mounted with a sleeve assembly (500), the intubation assembly (400) and the sleeve assembly (500) are threadedly connected, the bottom end of the anal canal (300) is sealed, and drainage holes (600) are arranged in an array on the circumferential surface of the bottom end of the anal canal (300), and an anti-backflow assembly (700) is fixedly mounted in the upper half of the anal canal (300); The anti-backflow component (700) comprises a reinforcing tube (701) fixedly mounted in the upper half of the anal canal (300); a square channel (702) is provided through the center of the reinforcing tube (701); the square channel (702) is arranged along the axial direction of the reinforcing tube (701); V-shaped openings (703) are provided at both ends of the reinforcing tube (701); the V-shaped openings (703) are communicated with the square channel (702); U-shaped grooves (704) are provided in an array on the top and bottom walls of the reinforcing tube (701) located in the square channel (702); the U-shaped grooves (704) are U-shaped and inclined to the left; guide blocks (705) are fixed in an array between the front and rear side walls of the square channel (702); The left half of the cross section of the guide block (705) is C-shaped, and the right half of the cross section of the guide block (705) is V-shaped. When the liquid in the square channel (702) flows from right to left, the guide block (705) is used to divert the liquid to the inside of the U-shaped groove (704).

2. The enema device for preventing backflow of enema liquid according to claim 1, characterized in that: A Morse dropper (201) is integrally formed on the conduit (200), and a speed regulator (202) is provided on the conduit (200).

3. The enema device for preventing backflow of enema liquid according to claim 1, characterized in that: An embedded tube (301) is provided in the tail end of the anal canal (300), the axis of the embedded tube (301) coincides with the axis of the anal canal (300), a bell mouth (302) is integrally formed at the right end of the embedded tube (301), a spacer ring (303) is fixedly installed on the outer wall of the left end of the embedded tube (301), a spiral rubber sheet (304) is fixed in an array on the outer wall of the embedded tube (301), the bell mouth (302), the spacer ring (303) and the spiral rubber sheet (304) are fixedly installed on the inner wall of the anal canal (300), and a tapered ring (305) is fixed in an array on the inner wall of the embedded tube (301) along its length direction; The spacer ring (303) and the tail end of the embedded tube (301) together form a drainage cavity, and the drainage hole (600) is in communication with the drainage cavity.

4. The enema device for preventing backflow of enema liquid according to claim 1, characterized in that: The cannula assembly (400) includes a blocking piece (401) fixedly mounted on the bottom end of the catheter (200), an externally threaded tube (402) fixedly mounted on the bottom end of the blocking piece (401), and a cannula body (403) fixedly mounted on the bottom end of the externally threaded tube (402), the blocking piece (401), the externally threaded tube (402) and the cannula body (403) having the same inner diameter as the catheter (200), the outer diameter of the blocking piece (401) being greater than the outer diameter of the externally threaded tube (402), and the outer diameter of the externally threaded tube (402) being greater than the outer diameter of the cannula body (403).

5. The enema device for preventing backflow of enema liquid according to claim 4, characterized in that: The sleeve assembly (500) includes a sleeve body (501) fixedly mounted on the top end of the anal canal (300), a retaining ring (502) fixedly mounted on the outer wall of the top end of the sleeve body (501), a retaining ring (503) fixedly mounted on the outer wall of the bottom end of the sleeve body (501), and an annular support (504) fixedly mounted on the inner wall of the lower half of the sleeve body (501); The cannula body (403) is inserted into the upper half of the sleeve body (501) and fits on the top of the annular support (504). The outer diameter of the cannula body (403) is equal to the inner diameter of the sleeve body (501). The inner diameter of the cannula body (403) is equal to the inner diameter of the annular support (504). The external threaded tube (402) abuts against the top of the retaining ring (502). A sleeve (505) is sleeved on the outside of the sleeve body (501) and the retaining ring (502), and a nut (506) is fixedly installed on the top of the sleeve (505), and the nut (506) is threadedly connected to the external threaded pipe (402).

6. The enema device for preventing backflow of enema liquid according to claim 5, characterized in that: The outer side of the sleeve body (501) is sleeved with a sliding ring (507), the inner wall of the sliding ring (507) is fixed with sliding posts (508) in an array, and valve pipes (509) are fixedly installed between the sliding posts (508); The lower half of the circumferential surface of the sleeve body (501) is provided with a sliding groove (510) in an array, the sliding groove (510) passes through the annular support platform (504), the sliding column (508) corresponds to the sliding groove (510) one by one, and the sliding column (508) is slidably connected in the sliding groove (510); The valve tube (509) is slidably connected in the annular support (504). The outer diameter of the valve tube (509) is equal to the inner diameter of the annular support (504). A sealing plug is fixedly installed on the inner wall of the bottom end of the annular support (504). The sealing plug is used to seal the bottom end of the valve tube (509). A water leakage groove is opened through the sealing plug. A spring (511) is fixed in an array between the top of the sliding ring (507) and the bottom of the retaining ring (502).

7. The enema device for preventing backflow of enema liquid according to claim 6, characterized in that: The sealing plug includes a valve core (512), a support plate (513) and a support rod (514); the valve core (512) is in the shape of a truncated cone; the inner wall of the bottom end of the valve tube (509) is adapted to the circumferential surface of the valve core (512); the support plate (513) is fixedly installed at the bottom of the valve core (512); and the support rod (514) array is fixed between the circumferential surface of the support plate (513) and the inner wall of the annular support platform (504).

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