Flushing device for preventing urinary tract infection related to catheter

Abstract

The invention relates to the field of medical apparatus and instruments, and discloses a flushing device for preventing catheter-related urinary tract infection.The flushing device comprises a connecting base, the front end of the main connecting base is fixedly connected with a connector, the rear end of the main connecting base is fixedly connected with a shielding cover, and a graded supply suction mechanism is arranged between the main connecting base and the shielding cover; a propelling assembly is arranged on the inner side wall of the shielding cover and used for assisting medical staff in increasing the flow speed of injection flushing fluid. Through the structural design, ordered injection of normal saline and care solution is achieved, mixed interference of different liquids is avoided, the washing logic of first cleaning and then protection is ensured, the washing effect is effectively improved, the hidden danger of bacterial residues is reduced, and powerful guarantee is provided for prevention of urinary tract infection related to the catheter. Meanwhile, the liquid supply process is automatic, new liquid can be automatically sucked in through negative pressure after one-time flushing is completed, repeated pipeline dismounting and adding are not needed, and the operation process is simplified.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a flushing device for preventing catheter-associated urinary tract infections. Background Technology

[0002] Catheter-associated urinary tract infection (CAD) is one of the most common complications in patients with indwelling urinary catheters. It has a high incidence rate and not only prolongs the patient's hospital stay and increases medical costs, but in severe cases it can also lead to serious infections such as sepsis, threatening the patient's life.

[0003] In clinical practice, regularly flushing the urinary catheter and keeping the tubing clean are key measures to prevent this type of infection.

[0004] Traditional flushing methods often involve using a syringe to draw saline and nursing solution in stages, manually injecting them into the catheter, and then using another set of tools to aspirate the mixture. This process is cumbersome and time-consuming. However, traditional flushing methods have many drawbacks: the order of injection of saline and nursing solution depends on manual control by medical staff, which can easily lead to reversed order or mixed injection, affecting the flushing effect. Furthermore, it is difficult to accurately control the force applied to the syringe manually, and if the flow rate is too fast, it can irritate the patient's urethral mucosa, causing pain and discomfort. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a flushing device for preventing catheter-related urinary tract infections. It solves the problem that the injection sequence of saline and nursing solution depends on manual control by medical staff, which can easily lead to reversed order or mixed injection, affecting the flushing effect.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a flushing device for preventing catheter-associated urinary tract infections, comprising a main connecting seat, a connector fixedly connected to the front end of the main connecting seat, a shield fixedly connected to the rear end of the main connecting seat, a graded supply and suction mechanism provided between the main connecting seat and the shield, and a propulsion component provided on the inner sidewall of the shield.

[0007] The graded supply and suction mechanism is used to spray saline and nursing solution sequentially from the connector to flush the catheter, and then sequentially suction out the mixture of saline and nursing solution after flushing.

[0008] Propulsion components are used to assist medical personnel in increasing the flow rate of the irrigation fluid.

[0009] Preferably, the graded supply and aspiration mechanism includes two sets of supply check valves, which are fixedly connected to the rear surface of the main connector. A saline storage tube is fixedly connected to the rear surface of the upper set of supply check valves, and a nursing solution storage tube is fixedly connected to the rear surface of the lower set of supply check valves. A piston rod b is slidably connected to the inner sidewall of the saline storage tube, and a piston rod a is slidably connected to the inner side of the nursing solution storage tube. A mixture discharge tube is fixedly connected to the bottom surface of the main connector, and a piston rod c is slidably connected to the inner sidewall of the mixture discharge tube. Piston rod a is elastically connected to the inner sidewall of the nursing solution storage tube via an elastic telescopic rod. A connecting disc is fixedly connected to the rear ends of piston rod b and piston rod c. Check valves are fixedly connected to the outer arc surfaces of the nursing solution storage tube, the mixture discharge tube, and the saline storage tube. A valve is provided on the inner wall of the bottom end of the mixture discharge tube.

[0010] Preferably, a guide post is fixedly connected to the center of the front end surface of the connecting plate, a push block is slidably connected to the surface of the guide post, a connecting rod is fixedly connected to the outer wall of the bottom end of the push block, the connecting rod is elastically connected to the inner side wall of the piston rod c by a return spring, and a baffle is fixedly connected to the end of the connecting rod away from the push block.

[0011] Preferably, the propulsion assembly includes a rotating shaft, a gear is fixedly connected to the rotating center axis of the rotating shaft, a threaded rod is fixedly connected to the rotating center axis of the gear away from the rotating shaft, a slide rod is threadedly connected to the surface of the threaded rod, a guide block is slidably connected through the surface of the slide rod, a contact plate is fixedly connected to the end of the slide rod away from the threaded rod, the shield is divided into two sections, one section is fixedly connected to the surface of the rear end of the main connecting seat, and the other section is fixedly connected to the surface of the front end of the saline storage tube and the mixture discharge tube, and an internal toothed ring is rotatably connected to the inner side of the divided section of the shield.

[0012] Preferably, one end of the elastic telescopic rod is fixedly connected to the center of the rear surface of the main connecting seat, and the other end of the elastic telescopic rod is fixedly connected to the surface of the outer arc protrusion of the piston rod a. The end of the piston rod a away from the nursing fluid storage tube is in contact with the inner side of the connecting plate.

[0013] Preferably, the piston rod b passes through and is slidably connected to the inner wall of the front end of the shield, and the piston rod c passes through and is slidably connected to the inner wall of the front section of the shield.

[0014] Preferably, the bottom end of the outer wall of the press block contacts the surface of the front end of the connecting disc, and the connecting rod passes through and is slidably connected to the piston rod c and the inner side wall of the connecting disc.

[0015] Preferably, one end of the return spring is fixedly connected to the surface of the connecting rod, and the other end of the return spring is fixedly connected to the inner sidewall of the piston rod c. The bottom end of the piston rod c is provided with a slot, and the baffle is in contact with the surface of the bottom end of the mixture discharge pipe.

[0016] Preferably, the inner sidewall of the internal gear ring meshes with the outer arc surface of the gear, the rotating shaft is rotatably connected to the surface of the rear end of the main connecting seat, and the guide block is fixedly connected to the outer arc surface of the saline storage tube.

[0017] Preferably, the slide bar passes through and is slidably connected to the inner sidewall of the connecting plate, and the inner sidewall of the contact plate is in contact with the surface of the pressing block.

[0018] This invention provides a flushing device for preventing catheter-associated urinary tract infections. It has the following beneficial effects:

[0019] 1. This invention achieves the orderly injection of saline and nursing solution through structural design, avoiding interference from mixing different liquids, ensuring a flushing logic of cleaning before protection, effectively improving flushing effect, reducing the risk of bacterial residue, and providing strong protection against catheter-related urinary tract infections. Simultaneously, the fluid replenishment process is automated; after one flush, new fluid can be automatically drawn in through negative pressure, eliminating the need for repeated disassembly and refilling of tubing, thus simplifying the operation.

[0020] 2. The automatic suction and one-way protection design of this invention significantly reduces the risk of residue. After rinsing, the mixed liquid is automatically sucked out by negative pressure without the need for additional tools, reducing operation steps and pipeline exposure time, and reducing the probability of cross-infection. The one-way valve structure of each pipeline forms a closed-loop protection to prevent liquid backflow or external contaminants from entering, ensuring the sterility of the rinsing process, while reducing the labor intensity of medical staff and improving the efficiency of nursing work.

[0021] 3. This invention achieves slow and uniform propulsion of the flushing fluid through a mechanical transmission structure, avoiding flow rate fluctuations caused by manual pressing, reducing irritation to the patient's urethral mucosa, and relieving pain and discomfort; it is also easy to operate, and medical staff can flexibly adjust the flow rate according to the patient's tolerance to meet the individual needs of different patients. The overall structure has a high degree of integration, is compact in size, is easy to operate and carry in clinical practice, and is suitable for diverse nursing scenarios. Attached Figure Description

[0022] Figure 1 This is an overall perspective view of the present invention;

[0023] Figure 2 This is a three-dimensional structural diagram of the propulsion component of the present invention;

[0024] Figure 3 This is a three-dimensional structural diagram of the graded supply and extraction mechanism of the present invention;

[0025] Figure 4 This is a three-dimensional structural diagram of the elastic telescopic rod of the present invention;

[0026] Figure 5 This is a partial cross-sectional view of the connecting disc and piston rod b of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the baffle and piston rod b in the separated state of the present invention.

[0028] The components are as follows: 1. Main connecting seat; 2. Connecting head; 3. Staged supply and suction mechanism; 31. Supply check valve; 32. Nursing solution storage tube; 33. Saline solution storage tube; 34. Check valve; 35. Mixture discharge tube; 36. Piston rod a; 37. Piston rod b; 38. Piston rod c; 39. Connecting plate; 310. Guide post; 311. Elastic telescopic rod; 312. Press block; 313. Connecting rod; 314. Return spring; 315. Valve; 316. Baffle; 4. Shielding cover; 5. Propulsion assembly; 51. Rotating shaft; 52. Gear; 53. Threaded rod; 54. Slide rod; 55. Guide block; 56. Contact plate; 57. Internal gear ring. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example:

[0031] Please see the appendix Figure 1 - Appendix Figure 6 This invention provides a flushing device for preventing catheter-associated urinary tract infections, including a main connector 1, a connector 2 fixedly connected to the front end of the main connector 1, a shield 4 fixedly connected to the rear end of the main connector 1, a graded supply and suction mechanism 3 provided between the main connector 1 and the shield 4, and a propulsion component 5 provided on the inner side wall of the shield 4.

[0032] The graded supply and suction mechanism 3 is used to spray saline and nursing solution sequentially from the connector 2 to flush the catheter, and to sequentially suction out the mixture of saline and nursing solution after flushing.

[0033] Propulsion component 5 is used to assist medical staff in increasing the flow rate of the irrigation fluid.

[0034] Furthermore, the graded supply and suction mechanism 3 includes a supply check valve 31. Two sets of supply check valves 31 are provided, which are fixedly connected to the rear surface of the main connecting seat 1. The surface of the rear end of the upper supply check valve 31 is fixedly connected to a saline storage tube 33, and the surface of the rear end of the lower supply check valve 31 is fixedly connected to a nursing solution storage tube 32. The design of the supply check valve 31 allows the saline and nursing solution stored in the supply check valve 31 and the saline storage tube 33 to enter the main connecting seat 1 in one direction only, and be delivered to the catheter from the connector 2. The volume of the nursing solution storage tube 32 is only half that of the saline storage tube 33. A piston rod b37 is slidably connected to the inner side wall of the saline storage tube 33, and a piston rod a36 is slidably connected to the inner side of the nursing solution storage tube 32. A mixture discharge tube 35 is fixedly connected to the bottom surface of the main connecting seat 1. The mixture discharge tube 35, the saline storage tube 33, and the nursing solution storage tube 32 are all connected to the main connecting seat 1.

[0035] Specifically, a piston rod c38 is slidably connected to the inner wall of the mixture discharge tube 35. A piston rod b37 penetrates and is slidably connected to the inner wall of the front end of the shield 4. A piston rod c38 penetrates and is slidably connected to the inner wall of the front section of the shield 4. A piston rod a36 is elastically connected to the inner wall of the nursing solution storage tube 32 via an elastic telescopic rod 311. One end of the elastic telescopic rod 311 is fixedly connected to the center of the rear surface of the main connecting seat 1, and the other end of the elastic telescopic rod 311 is fixedly connected to the surface of the outer arc protrusion of the piston rod a36. The function of the elastic telescopic rod 311 is to automatically reset the position of the piston rod a36 after it has been moved by the contact and compression of the connecting plate 39. The end of the piston rod a36 away from the nursing solution storage tube 32 contacts the inner side of the connecting plate 39. The contact between the two causes the movement of the connecting plate 39 to first push the piston rod b37 to push the saline solution inside the saline solution storage tube 33 into the interior of the main connecting seat 1 and deliver it to the catheter. As the pushing continues, the piston rod b37 will be pushed to the inner wall of the main connecting seat 1. A36 moves along the inner wall of the nursing solution storage tube 32, thereby pushing the nursing solution into the main connecting seat 1 and delivering it into the catheter. The rear ends of piston rods B37 and C38 are fixedly connected to a connecting plate 39. One-way valves 34 are fixedly connected to the outer arc surfaces of the nursing solution storage tube 32, the mixture discharge tube 35, and the saline storage tube 33. The surfaces of the one-way valves 34 of the nursing solution storage tube 32 and the saline storage tube 33 are respectively connected to the saline supply tube and the nursing solution supply tube. After one injection is completed, the reverse movement of piston rods B37 and A36 will allow the externally connected saline supply tube and nursing solution supply tube to be supplied with negative pressure. The one-way valve 34 on the outside of the mixture discharge tube 35 can only discharge in one direction. When the piston rod C38 is pressed down, the groove on its surface opens, and no negative pressure is generated inside. After the reverse movement, the saline and impurities in the catheter are drawn into the interior of the mixture discharge tube 35 and discharged outward from the one-way valve 34.

[0036] Furthermore, a guide post 310 is fixedly connected to the center of the front surface of the connecting plate 39. A button block 312 is slidably connected to the surface of the guide post 310. The function of the guide post 310 is to guide the movement of the button block 312. A connecting rod 313 is fixedly connected to the outer wall of the bottom end of the button block 312. When the button block 312 is pressed down on the surface of the guide post 310, it will drive the connecting rod 313 to descend synchronously. The bottom end of the outer wall of the button block 312 contacts the surface of the front end of the connecting plate 39. When the button block 312 is contacted and descended by the piston rod a36, it will push the button block 312 to move on the surface of the guide post 310. The connecting rod 313 contacts the connecting plate 39, thereby pushing the connecting plate 39 to move. The connecting rod 313 passes through and is slidably connected to the inner sidewall of the piston rod c38 and the connecting plate 39. The inner side of the connecting plate 39 and the piston rod c38 is provided with a guide groove that fits the connecting rod 313, so that the connecting rod 313 can move back and forth inside the piston rod c38 and the connecting plate 39. The connecting rod 313 is elastically connected to the inner sidewall of the piston rod c38 by a return spring 314. One end of the return spring 314 is fixedly connected to the surface of the connecting rod 313, and the other end of the return spring 314 is fixedly connected to the piston rod c38. On the inner sidewall of 8, the return spring 314 automatically resets the position of the connecting rod 313 after it has been pressed and moved by the button 312. A slot is provided at the bottom end of the piston rod c38, and the baffle 316 contacts the surface of the bottom end of the mixture discharge pipe 35. This contact causes the button 312 to move the connecting rod 313 and the baffle 316 synchronously during pressing, thereby opening the slot at the bottom end of the piston rod c38 to allow air circulation. Simultaneously, as the button 312 descends, it contacts the connecting plate 39, thus pushing the connecting plate 39 to move. A baffle 316 is fixedly connected to the end of the connecting rod 313 away from the push block 312. A valve 315 is provided on the inner wall of the bottom end of the mixture discharge pipe 35. The valve 315 can block the liquid inlet at the bottom end of the mixture discharge pipe 35. When the baffle 316 blocks the groove of the mixture discharge pipe 35, a negative pressure will be generated inside the mixture discharge pipe 35. The valve 315 will open, so that the saline and nursing solution injected into the catheter through the main connecting seat 1 and the connecting head 2 will be drawn into the mixture discharge pipe 35 and discharged from the one-way valve 34 that is delivered outward from its surface.

[0037] Furthermore, the propulsion component 5 includes a rotating shaft 51, with a gear 52 fixedly connected to the rotation center axis of the rotating shaft 51. A threaded rod 53 is fixedly connected to the rotation center axis of the gear 52 away from the rotating shaft 51. The rotating shaft 51 can provide rotational support for the gear 52 and the threaded rod 53, allowing them to rotate concentrically. A slide rod 54 is threadedly connected to the surface of the threaded rod 53. An internal thread groove is provided on the inner side of the slide rod 54. The rotation of the threaded rod 53 allows the slide rod 54 to move threadedly on its surface. A guide block 55 is slidably connected through the surface of the slide rod 54. A notch that matches the inner diameter of the guide block 55 is provided on the outer arc surface of the slide rod 54, allowing the guide block 55 to guide the slide rod 54. The guide block 55 can only move back and forth, preventing the rotation of the threaded rod 53 from causing the slide rod 54 to rotate in place.

[0038] Specifically, a contact plate 56 is fixedly connected to the end of the slide rod 54 away from the threaded rod 53. The shield 4 is divided into two sections: one section is fixedly connected to the surface of the rear end of the main connecting seat 1, and the other section is fixedly connected to the surface of the front end of the saline storage tube 33 and the mixture discharge tube 35. By setting the shield 4, the graded supply suction mechanism 3 and the propulsion assembly 5 can be shielded and protected. An internal gear ring 57 is rotatably connected to the inner side of the divided section of the shield 4. The inner sidewall of the internal gear ring 57 meshes with the outer arc surface of the gear 52. The outer arc surface of the internal gear ring 57 has an anti-slip notch. By rotating the internal gear ring 57, the gear 52 can be meshed and rotated, so that the threaded rod 53 rotates synchronously. The rotating shaft 51 is rotatably connected to the surface of the rear end of the main connecting seat 1. The guide block 55 is fixedly connected to the outer arc surface of the saline storage tube 33. The slide rod 54 passes through and is slidably connected to the inner side wall of the connecting plate 39. The inner side of the connecting plate 39 has a through hole that fits the slide rod 54, so that the slide rod 54 can move back and forth on the inner wall of the connecting plate 39. The inner side wall of the contact plate 56 is in contact with the surface of the pressing block 312. The contact between the two causes the slide rod 54 to drive the contact plate 56 to contact the pressing block 312 when it moves threadedly. Thus, through the contact between the pressing block 312 and the connecting plate 39, the connecting plate 39 is pushed to drive the piston rod b37 and piston rod c38 and piston rod a36 to contact, so as to push them to move slowly. This avoids the discomfort caused to the patient due to the uncontrollable pressure of manual pressing, which could lead to an increased flow rate.

[0039] Working principle: Liquid replenishment and graded rinsing stage. In the initial state of the device, the saline storage tube 33 and the nursing solution storage tube 32 are connected to the external saline supply tube and nursing solution supply tube respectively through the one-way valve 34 on their outer arc surface. After the previous rinsing is completed, the piston rods b37 and a36 move in opposite directions under the action of the elastic telescopic rod 311 and the return spring 314, creating a negative pressure in the storage tubes. This automatically draws in saline and nursing solution through the one-way valve 34, completing the liquid replenishment. When starting the flushing, it can be done by pushing component 5 or manually: Press the button 312, the button 312 slides down along the guide post 310, driving the connecting rod 313 to descend synchronously. The connecting rod 313 pushes the baffle 316 to open the slot at the bottom of the piston rod c38, allowing air to circulate and avoiding negative pressure obstruction; continue to press the button 312 to make it contact the connecting plate 39, pushing the connecting plate 39 forward. The connecting plate 39 first drives the piston rod b37 to slide along the inner wall of the saline storage tube 33. The saline enters the main connecting seat 1 through the supply check valve 31, and then is delivered to the catheter through the connector 2, completing the initial flushing; the connecting plate 39 continues to move forward until it contacts the piston rod a36, squeezing the piston rod a36 to overcome the elastic force of the elastic telescopic rod 311 and slide along the inner wall of the nursing solution storage tube 32. The nursing solution (half the volume of the saline) enters the main connecting seat 1 through another set of supply check valves 31 and is delivered to the catheter, realizing graded sequential flushing.

[0040] Mixture extraction and flow rate control stage. After rinsing, release the button 312, and the reset spring 314 drives the connecting rod 313 and the baffle 316 to reset. The baffle 316 closes the bottom hole groove of the piston rod c38. At the same time, the elastic telescopic rod 311 pushes the piston rod a36 to reset, and the connecting plate 39 drives the piston rod b37 and the piston rod c38 to move in the opposite direction. A negative pressure is generated in the mixture discharge tube 35, the valve 315 opens, and the physiological saline, nursing solution mixture and impurities in the catheter are drawn into the mixture discharge tube 35 and finally discharged in one direction through the one-way valve 34 on its outer arc surface. If the flushing flow rate needs to be adjusted, rotate the inner toothed ring 57 on the inner side of the shield 4 segment (the outer arc surface anti-slip notch facilitates operation). The inner toothed ring 57 meshes with the gear 52 and rotates. The gear 52 drives the coaxial threaded rod 53 to rotate synchronously. The threaded rod 53 is threadedly engaged with the slide rod 54, and the guide block 55 guides the slide rod 54 to prevent it from rotating on its own. This allows the slide rod 54 to move slowly along the axial direction of the threaded rod 53. The contact plate 56 at one end of the slide rod 54 contacts the surface of the pressing block 312, smoothly pushing the pressing block 312 to move. This avoids the uncontrollable pressure of manual pressing, which can lead to an excessively fast flow rate and reduce patient discomfort.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flushing device for preventing catheter-associated urinary tract infections, characterized in that, Includes a main connector (1), with a connector (2) fixedly connected to the front end of the main connector (1), and a shield (4) fixedly connected to the rear end of the main connector (1). A graded supply and suction mechanism (3) is provided between the main connector (1) and the shield (4), and a propulsion component (5) is provided on the inner side wall of the shield (4). The graded supply and suction mechanism (3) is used to spray saline and nursing solution sequentially from the connector (2) to flush the catheter, and to suction out the mixture of saline and nursing solution after flushing. The propulsion component (5) is used to assist medical staff in injecting the flow rate of the irrigation fluid.

2. The flushing device for preventing catheter-associated urinary tract infections according to claim 1, characterized in that, The graded supply and suction mechanism (3) includes a supply check valve (31), which has two sets, respectively fixedly connected to the surface of the rear end of the main connecting seat (1). The surface of the rear end of the upper supply check valve (31) is fixedly connected to a saline storage tube (33), and the surface of the rear end of the lower supply check valve (31) is fixedly connected to a nursing solution storage tube (32). A piston rod b (37) is slidably connected to the inner side wall of the saline storage tube (33), and a piston rod a (36) is slidably connected to the inner side of the nursing solution storage tube (32). The surface of the bottom end of the main connecting seat (1) is fixedly connected to the saline storage tube (33). A mixture discharge tube (35) is fixedly connected to the inner side wall of the mixture discharge tube (35), and a piston rod c (38) is slidably connected to the inner side wall of the nursing solution storage tube (32) through an elastic telescopic rod (311). A connecting plate (39) is fixedly connected to the rear end of the piston rod b (37) and the piston rod c (38). A one-way valve (34) is fixedly connected to the outer arc surface of the nursing solution storage tube (32), the mixture discharge tube (35) and the saline storage tube (33). A valve (315) is provided on the inner wall of the bottom end of the mixture discharge tube (35).

3. The flushing device for preventing catheter-associated urinary tract infections according to claim 2, characterized in that, A guide post (310) is fixedly connected to the center of the front end surface of the connecting plate (39). A button (312) is slidably connected to the surface of the guide post (310). A connecting rod (313) is fixedly connected to the outer wall of the bottom end of the button (312). The connecting rod (313) is elastically connected to the inner side wall of the piston rod c (38) through a return spring (314). A baffle (316) is fixedly connected to the end of the connecting rod (313) away from the button (312).

4. The flushing device for preventing catheter-associated urinary tract infections according to claim 1, characterized in that, The propulsion assembly (5) includes a rotating shaft (51), a gear (52) is fixedly connected to the rotating center axis of the rotating shaft (51), a threaded rod (53) is fixedly connected to the rotating center axis of the gear (52) away from the rotating shaft (51), a slide rod (54) is threadedly connected to the surface of the threaded rod (53), a guide block (55) is slidably connected to the surface of the slide rod (54), a contact plate (56) is fixedly connected to the end of the slide rod (54) away from the threaded rod (53), the shield (4) is divided into two sections, one section is fixedly connected to the surface of the rear end of the main connecting seat (1), and the other section is fixedly connected to the surface of the front end of the saline storage tube (33) and the mixture discharge tube (35), and an internal toothed ring (57) is rotatably connected to the inner side of the divided section of the shield (4).

5. A flushing device for preventing catheter-associated urinary tract infections according to claim 2, characterized in that, One end of the elastic telescopic rod (311) is fixedly connected to the center of the rear surface of the main connecting seat (1), and the other end of the elastic telescopic rod (311) is fixedly connected to the surface of the outer arc protrusion of the piston rod a (36). The end of the piston rod a (36) away from the nursing fluid storage tube (32) is in contact with the inner side of the connecting plate (39).

6. The flushing device for preventing catheter-associated urinary tract infections according to claim 2, characterized in that, The piston rod b (37) passes through and is slidably connected to the inner wall of the front end of the shield (4), and the piston rod c (38) passes through and is slidably connected to the inner wall of the front section of the shield (4).

7. A flushing device for preventing catheter-associated urinary tract infections according to claim 3, characterized in that, The bottom end of the outer wall of the push block (312) is in contact with the surface of the front end of the connecting plate (39), and the connecting rod (313) is slidably connected to the piston rod c (38) and the inner side wall of the connecting plate (39).

8. The flushing device for preventing catheter-associated urinary tract infections according to claim 3, characterized in that, One end of the reset spring (314) is fixedly connected to the surface of the connecting rod (313), and the other end of the reset spring (314) is fixedly connected to the inner side wall of the piston rod c (38). The bottom end of the piston rod c (38) is provided with a slot, and the baffle (316) is in contact with the surface of the bottom end of the mixture discharge pipe (35).

9. A flushing device for preventing catheter-associated urinary tract infections according to claim 4, characterized in that, The inner sidewall of the internal gear ring (57) meshes with the outer arc surface of the gear (52), the rotating shaft (51) is rotatably connected to the surface of the rear end of the main connecting seat (1), and the guide block (55) is fixedly connected to the outer arc surface of the saline storage tube (33).

10. A flushing device for preventing catheter-associated urinary tract infections according to claim 4, characterized in that, The slide bar (54) passes through and is slidably connected to the inner sidewall of the connecting plate (39), and the inner sidewall of the contact plate (56) is in contact with the surface of the push block (312).

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