Enemator for preventing enema liquid from regurgitating

Abstract

The invention relates to the technical field of medical instruments, and discloses an enemator for preventing enema reflux, which comprises an enema bag, a catheter and an anal tube, the catheter is connected to the bottom of the enema bag, the bottom end of the catheter is fixedly provided with a cannula assembly, the open end of the anal tube is fixedly provided with a cannula assembly, the cannula assembly is in threaded connection with the cannula assembly, and the cannula assembly is fixedly connected with the anal tube. The bottom end of the anal tube is sealed, drainage holes are formed in the circumferential face of the bottom end of the anal tube in an array penetrating mode, and an anti-backflow assembly is fixedly installed in the upper half portion of the anal tube. The clysis liquid flows from right to left along the square channel, after the clysis liquid is divided by the V-shaped end of the flow guide block, one part of the liquid continues to flow along the square channel, the other part of the liquid penetrates through the U-shaped groove to flow, the flowing direction of the liquid is changed after the liquid passes through the U-shaped groove, convection is generated between the liquid and the liquid in the square channel, and therefore the flowing speed of the liquid in the square channel is slowed down. Therefore, the purpose of preventing the enema liquid from flowing back to the inside of the enemator is achieved.

Description

Technical Field

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

[0002] Enema is a medical device, which consists of a liquid storage container, a catheter, and an anal canal. It is made of polymer materials and is mainly used for clinical enema. The anal canal is inserted into the anus, the liquid storage container is hung at a high place, and the enema liquid enters the intestine by gravity and squeezing the liquid storage container by hand.

[0003] During the enema process, reflux is likely to occur due to intestinal blockage, intestinal motility disorders of the patient, body position during enema, selection and insertion depth of the enema tube, temperature and amount of the enema solution, etc. During reflux, the enema solution and the body fluid in the intestine enter the anal canal together, causing contamination to the anal canal and catheter. Conventional enema devices do not have a reflux prevention structure, so further improvements can be made. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides an enema device for preventing backflow of enema liquid, which has the advantages of preventing backflow of enema liquid into the enema device, etc., and solves the problem that backflow occurs during enema and conventional enema devices do not have a backflow prevention structure.

[0006] (II) Technical solution

[0007] In order 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 canal, the catheter being connected to the bottom of the enema bag, a cannula assembly being fixedly installed at the bottom end of the catheter, a sleeve assembly being fixedly installed at 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 arranged in an array on the circumferential surface of the bottom end of the anal canal, and an anti-backflow assembly being fixedly installed 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 conical 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 an inner diameter equal to that of 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 installed on the top end of the anal canal, a retaining ring 1 is fixedly installed on the outer wall of the top end of the sleeve body, a retaining ring 2 is fixedly installed on the outer wall of the bottom end of the sleeve body, and an annular support is fixedly installed on the inner wall of the lower half of the sleeve body; the insert 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 insert body is equal to the inner diameter of the sleeve body, the inner diameter of the insert 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 installed 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, 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 a truncated cone shape, 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 platform.

[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 axial 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, 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] (III) 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 the 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 occurs with the liquid inside the square channel, thereby slowing down the flow speed of the liquid inside the square channel. And 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 the backflow of enema liquid has a tendency to move downwards through the elasticity of the spring, so that the valve tube is attached to the surface of the valve core, and the annular support is sealed through the cooperation of the valve tube and the valve core to prevent the inside of the anal canal from being contaminated;

[0020] 3. The enema device for preventing the backflow of enema liquid enhances the strength of the tail end of the anal canal by setting the spiral rubber sheet, while the tail end of the anal canal can still be bent to prevent the intestinal peristalsis from squeezing the tail end of the anal canal too much and affecting the flow of the enema liquid. The setting of the conical ring makes the enema liquid flow smoothly from right to left, and encounters greater resistance when flowing from left to right. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 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 after the enema bag is removed;

[0023] Figure 3 It 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 after removing the enema bag;

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

[0025] Figure 5 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 A schematic diagram of the front cross-sectional structure of a cannula assembly and a sleeve assembly of an enema device for preventing backflow of enema liquid proposed by the present invention;

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

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

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

[0030] Fig.10 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 when viewed from above;

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

[0032] In the figure: 100, enema bag; 200, catheter; 300, anal tube; 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, conical ring; 401, blocking sheet; 402, external threaded tube; 403, cannula body; 5 01, sleeve body; 502, retaining ring 1; 503, retaining ring 2; 504, annular support; 505, sleeve; 506, nut; 507, sliding ring; 508, sliding column; 509, valve pipe; 510, sliding groove; 511, spring; 512, valve core; 513, support plate; 514, support rod; 701, reinforcement tube; 702, square channel; 703, V-shaped mouth; 704, U-shaped groove; 705, guide block. DETAILED DESCRIPTION

[0033] In the description of the present 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 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 should not be understood as a limitation on the present application.

[0034] The following will be combined with 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 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 creative work 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, 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, a Morse dropper 201 is integrally formed on the catheter 200, and a speed regulator 202 is arranged on the catheter 200. A cannula assembly 400 is fixedly installed at the bottom end of the catheter 200, a sleeve assembly 500 is fixedly installed at one end of the opening of the anal canal 300, the cannula assembly 400 is threadedly connected with the sleeve assembly 500, the bottom end of the anal canal 300 is sealed, and a drainage hole 600 is 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 installed in the upper half of the anal canal 300. The anti-backflow assembly 700 blocks the backflowing liquid to prevent backflow. And the anti-backflow assembly 700 is located at the patient's anus to prevent the anal canal 300 from being squeezed and transitioned due to the patient's non-cooperation, which affects the stability of the anal canal 300 in transporting the enema liquid.

[0036] See also Figure 4-Figure 5 , an embedded tube 301 is arranged 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, 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, the spacer ring 303 and the tail end of the embedded tube 301 are surrounded to form a drainage cavity, and the drainage hole 600 is connected to the drainage cavity. Therefore, the enema liquid inside the anal canal 300 can enter the embedded tube 301 through the bell mouth 302, then enter the drainage cavity, and finally enter the patient's intestine through the drainage hole 600. The outer wall of the embedded tube 301 is fixed with spiral rubber sheets 304 in an array, and the inner wall of the embedded tube 301 is fixed with tapered rings 305 in an array along its length direction; the arrangement of the spiral rubber sheets 304 enhances the strength of the tail end of the anal canal 300, while the tail end of the anal canal 300 can still be bent, preventing the intestinal peristalsis from squeezing the tail end of the anal canal 300 too much, thereby affecting the flow of the enema liquid. The arrangement of the tapered ring 305 allows the enema liquid to flow smoothly from right to left, but encounters 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 externally threaded tube 402 is fixedly installed at the bottom end of the blocking piece 401, and a cannula body 403 is fixedly installed at the bottom end of the externally threaded tube 402. The blocking piece 401, the externally 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 externally threaded tube 402, and the outer diameter of the externally threaded tube 402 is larger than the outer diameter of the cannula body 403.

[0038] See also Figure 6-Figure 10 The sleeve assembly 500 includes a sleeve body 501 fixedly installed on the top of the anal tube 300, a retaining ring 502 is fixedly installed on the outer wall of the top end of the sleeve body 501, a retaining ring 2 503 is fixedly installed on the outer wall of the bottom end of the sleeve body 501, and an annular support 504 is fixedly installed 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, and 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, a nut 506 is fixedly installed 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 Figure 6-Figure 10 A sliding ring 507 is sleeved on the outer side of the sleeve body 501, and 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 columns 508 are fixed to the inner wall array of the sliding ring 507, and valve pipes 509 are fixedly installed between the sliding columns 508, and the lengths of the valve pipe 509 and the sliding ring 507 are equal.

[0040] The lower half of the circumferential surface of the sleeve body 501 is provided with a sliding groove 510 in an array, and the sliding groove 510 penetrates the annular support 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 pipe 509 is slidably connected in the annular support 504, and the outer diameter of the valve pipe 509 is equal to the inner diameter of the annular support 504. Moreover, the length of the valve pipe 509 and the sliding ring 507 is greater than twice the length of the sliding groove 510. When the sliding column 508 slides inside the sliding groove 510, the valve pipe 509 and the sliding ring 507 always maintain a sealing effect on the sliding groove 510.

[0041] 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 1 502. The elasticity of the spring 511 makes the sliding ring 507 have a tendency to move downward. Initially, the sliding ring 507 fits on the bottom wall of the sleeve 505, the bottom of the sleeve 505 fits on the top of the retaining ring 2 503, the top wall of the sleeve 505 fits on the top of the retaining ring 1 502, and the sliding column 508 fits on the bottom wall of the sliding groove 510. At this time, the sealing plug seals the bottom of the valve tube 509.

[0042] See also Figure 6-Figure 10 The sealing plug includes a valve core 512, a support plate 513 and a support rod 514. The valve core 512 is in a truncated cone shape. The inner wall of the bottom end of the valve tube 509 is matched with the circumferential surface of the valve core 512. The support plate 513 is fixedly installed at the bottom of the valve core 512. 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. The gap between the support rods 514 forms a leaking groove. When the valve tube 509 moves upward, the valve tube 509 is separated from the valve core 512, and the enema liquid can pass through the valve tube 509 and the gap between the support rods 514 to enter the interior of the anal canal 300.

[0043] See also Figure 3 and Fig.11The anti-backflow component 700 includes a reinforcing tube 701 fixedly installed in the upper half of the anal canal 300, a square channel 702 is opened through the center of the reinforcing tube 701, and the square channel 702 is arranged along the axis direction of the reinforcing tube 701. V-shaped openings 703 are opened at both ends of the reinforcing tube 701, and the V-shaped openings 703 are connected to the square channel 702. The reinforcing tube 701 is located on the top wall and the bottom wall of the square channel 702. U-shaped grooves 704 are arranged in an array, and the U-shaped grooves 704 are U-shaped and inclined 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 component 700 is greater than the wall thickness of the anal canal 300, thereby enhancing the strength of the anti-backflow component 700. It is prevented that the patient's anus extrudes too much pressure on the anti-backflow component 700, causing the anti-backflow component 700 to deform.

[0044] See also Fig.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 to the inside of the U-shaped groove 704. Therefore, when the enema liquid flows back, the liquid flows from right to left, and 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, and the other part of the liquid 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 inside the square channel 702, thereby slowing down the flow speed of the liquid inside the square channel 702. And 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 avoiding the backflow of the enema liquid.

[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] When in use, the elasticity of the spring 511 causes the sliding ring 507, the sliding column 508 and the valve tube 509 to move downward, so that the valve tube 509 fits on the surface of the valve core 512, so that the valve tube 509 and the valve core 512 cooperate to seal the annular support 504, thereby preventing the inside of the anal canal 300 from being contaminated;

[0047] When performing enema, the cannula body 403 is inserted into the interior of the sleeve body 501, and then the sleeve 505 is screwed to make the nut 506 threadedly connected to the external threaded tube 402, so that the cannula body 403 and the sleeve body 501 are stably connected together; and in 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, so that the valve tube 509 is separated from the valve core 512, and 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 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 multiple conical rings 305 to inhibit the reflux of the enema liquid.

[0049] When the backflow effect is large, 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, and the other part of the liquid 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 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 avoiding the backflow of the enema liquid.

[0050] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present 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 characterized in that: The bottom end of the catheter (200) is fixedly mounted with a cannula assembly (400), the open end of the anal canal (300) is fixedly mounted with a sleeve assembly (500), the cannula assembly (400) is threadedly connected to the sleeve assembly (500), 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).

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 arranged in 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 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 fixedly installed 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 conical ring (305) is fixedly installed in an array on the inner wall of the embedded tube (301) along its length direction; The spacer ring (303) and the rear 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) comprises 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), 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) comprises 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 insert tube 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 insert tube body (403) is equal to the inner diameter of the sleeve body (501). The inner diameter of the insert tube 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 outer side 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 columns (508) in an array, and valve pipes (509) are fixedly installed between the sliding columns (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) penetrates 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 platform (504); the outer diameter of the valve tube (509) is equal to the inner diameter of the annular support platform (504); a sealing plug is fixedly installed on the inner wall of the bottom end of the annular support platform (504); the sealing plug is used to seal the bottom end of the valve tube (509); and a water leakage groove is penetrated through the sealing plug; Springs (511) are 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 comprises 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).

8. The enema device for preventing backflow of enema liquid according to claim 1, characterized in that: The anti-backflow component (700) comprises 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 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 wall and the bottom wall of the reinforcing tube (701) located in the square channel (702); the U-shaped grooves (704) are U-shaped and inclined to the left; and guide blocks (705) are fixed in an array between the front and rear side walls of the square channel (702).

9. The enema device for preventing backflow of enema liquid according to claim 1, characterized in that: 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).

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