Disposable precision filter infusion set with needle

Abstract

The present invention belongs to the field of infusion sets, and in particular to a disposable precision filtering infusion set with a needle. In view of the fact that the existing infusion sets do not have a corresponding mixing device, it is easy to cause uneven mixing of the added medicine liquid, and the insoluble particles in the medicine liquid cannot be filtered. The following scheme is proposed, which includes a fixed seat, a mounting chamber is provided on the fixed seat, and a first infusion tube and a second infusion tube are fixedly installed on the top inner wall and the bottom inner wall of the mounting chamber respectively. The present invention pushes the medicine liquid into the connecting chamber and impacts the blades, so that the medicine liquid can be pushed into the mounting tube and mixed with the medicine liquid in the mounting tube. After that, the insoluble particles in the medicine liquid can be filtered by using the medicine film, so that the insoluble particles can be prevented from entering the patient's body, so that no damage is caused to the patient's body. When adding medicine, it can be fully stirred with the medicine liquid in the infusion bottle.

Description

Technical Field

[0001] The invention relates to the technical field of infusion sets, and in particular to a disposable precision filtering infusion set with a needle. Background Art

[0002] Intravenous infusion is an important means of routine clinical treatment, and an infusion set is required for infusion. An infusion set is a disposable medical consumable that is mainly used for intravenous infusion and has been sterilized. The working principle of the infusion set is that under the action of gravity, the liquid in the bottle flows into the Murphy's dropper along the thinner infusion hose. When the water column pressure of the Murphy's dropper is greater than the venous pressure, the liquid in the bottle flows into the vein along the hose.

[0003] When patients are given infusions now, it is often necessary to add medicine during the infusion process. However, the existing method of adding medicine generally only uses a syringe to push the medicine into a dropper bottle without a corresponding mixing device, so it is easy to cause uneven mixing of the added medicine. At the same time, due to the differences in function and structure of different infusion sets, the filtering effects on insoluble particles (most of which have a diameter of less than 15μm) and bubbles in the medicine during the infusion process are different; if these insoluble particles and bubbles enter the human body, they will cause the patient to have clinical symptoms such as infusion reactions, pyrogen-like reactions, phlebitis, and pulmonary granulomas. Improper handling may even threaten the patient's life. Therefore, we propose a disposable precision filtration infusion set with a needle to solve the above-mentioned problems. Summary of the invention

[0004] Based on the technical problem that there is no corresponding mixing device in the background technology, which easily causes uneven mixing of the added medicine liquid and the insoluble particles in the medicine liquid cannot be filtered, the present invention proposes a disposable precision filtering infusion set with a needle.

[0005] The disposable precision filtration infusion set with needle proposed in the present invention comprises a fixing seat, a mounting chamber is provided on the fixing seat, and a first infusion tube and a second infusion tube are fixedly installed on the top inner wall and the bottom inner wall of the mounting chamber respectively, the ends of the first infusion tube and the second infusion tube that are away from each other extend to the top and the bottom of the fixing seat respectively and are fixedly installed with a bottle stopper puncture needle and a needle head respectively, and a flow limiter is provided on the second infusion tube, the ends of the first infusion tube and the second infusion tube that are close to each other are fixedly installed with mounting plates, and the same mounting tube is sealed and fixedly connected on the two mounting plates, the first infusion tube and the second infusion tube are both connected to the mounting tube, a medicine film is fixedly installed in the mounting tube, a dosing tube is fixedly installed on the top side of the fixing seat, the bottom end of the dosing tube passes through the mounting plate located above and extends into the mounting tube, and an L-shaped tube is sealed and fixedly installed in the dosing tube.

[0006] Preferably, mounting rings are fixedly mounted on the sides of the two mounting plates close to each other, and the two mounting rings are sealed and fixedly connected to the inner wall of the mounting tube. The mounting rings can be used to achieve a sealed and fixed connection between the mounting tube and the mounting plate.

[0007] Preferably, a fixing rod is fixedly installed in the installation chamber, and a connecting tube is rotatably connected to the fixing rod, the top of the connecting tube is rotatably connected to a connecting seat, a connecting chamber is provided on the connecting seat, the top of the connecting tube extends into the connecting chamber, connecting holes are provided on the top inner walls on both sides of the connecting tube, and the two connecting holes are both located in the connecting chamber, two stirring shafts are symmetrically fixedly installed on the bottom end of the connecting tube, and the bottom end of the L-shaped tube extends into the connecting chamber, so as to facilitate the flow of the added liquid medicine and realize the flow of the liquid medicine into the installation tube.

[0008] Preferably, a fixed plate is fixedly installed on the top of the connecting tube, and a plurality of blades are fixedly installed on the fixed plate at equal intervals, and a rotating seat is fixedly installed on the bottom of the connecting tube, a flow chamber is provided on the rotating seat, and two stirring shafts are respectively fixedly installed on both sides of the bottom of the rotating seat, a flow groove is opened on the top of the stirring shaft, through holes are opened on the inner walls on both sides of the bottom of the flow chamber, and the flow groove is connected with the through holes, and a plurality of flow holes are opened on the inner walls on both sides of the flow groove at equal intervals, and the impact force of the medicine can be used to drive the blades to rotate, and further can drive the stirring shaft to perform circular displacement.

[0009] Preferably, a sealing plate is sealingly fixedly installed on the inner wall of the dosing tube, and a sliding ring is sealingly and slidably connected to the inner wall of the dosing tube. A conical hole is opened on the sealing plate, and a sphere is sealingly fitted in the conical hole. The sliding ring is fixedly connected to the sphere, and the sphere can be used to achieve the effect of sealing the dosing tube.

[0010] Preferably, a mounting rod is fixedly mounted on the inner wall of the sliding ring, a push rod is fixedly mounted on one side of the mounting rod, one end of the push rod extends into the tapered hole and is fixedly connected to the sphere, and the mounting rod and the push rod can be used to achieve a fixed connection between the sphere and the sliding ring.

[0011] Preferably, a limit rod is fixedly mounted on the inner wall of the tapered hole, and a limit hole is provided on the limit rod. The push rod passes through the limit hole and is slidably connected to the inner wall of the limit hole. The limit rod can be used to slide the ball to limit the position.

[0012] Preferably, a limit spring is provided on the push rod, and the limit spring is located between the limit rod and the mounting rod. The two ends of the limit spring are respectively fixedly connected to the mounting rod and the limit rod. The limit spring can be used to elastically limit the sphere, so that under normal conditions, the sphere and the inner wall of the conical hole are sealed and fitted.

[0013] The beneficial effects of the present invention are:

[0014] When it is necessary to add medicine, first use a syringe to insert it into the medicine adding tube, and push the sliding ring to move. When the sliding ring moves, the ball can be driven to move by the push rod. When the ball moves, the medicine adding tube can be opened.

[0015] At this time, the syringe can be pushed to push the medicine to be added into the medicine adding tube. At this time, the medicine will impact the blades, thereby driving the connecting tube to rotate. When the connecting tube rotates, the two stirring shafts can be driven by the rotating seat to move in a circle. At the same time, the medicine entering the connecting chamber will flow into the mounting tube through the connecting tube, the flow chamber, the flow groove and the flow hole, and mix with the medicine in the infusion bottle. Since the stirring shaft moves in a circle, the mixed medicine is filtered through the medicine film, and the insoluble particles in the medicine can be filtered. Therefore, when the medicine enters the mounting tube, it will be mixed and stirred with the medicine in the infusion bottle and evenly flow into the patient's blood vessels.

[0016] The present invention pushes the medicine liquid into the connecting chamber and impacts the blades, so that the medicine liquid can be pushed into the installation tube and mixed with the medicine liquid in the installation tube. After that, the insoluble particles in the medicine liquid can be filtered by the medicine film, so as to prevent the insoluble particles from entering the patient's body, so as not to cause harm to the patient's body. When adding medicine, it can be fully stirred with the medicine liquid in the infusion bottle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural front view of the disposable precision filtering infusion set with a needle proposed by the present invention;

[0018] Figure 2 This is a front view of the connector structure of the disposable precision filter infusion set with a needle proposed by the present invention;

[0019] Figure 3 A top view of the connection seat structure of the disposable precision filtering infusion set with a needle proposed by the present invention;

[0020] Figure 4 This is a front view of the rotating seat structure of the disposable precision filtering infusion set with a needle proposed by the present invention;

[0021] Figure 5 This is a front view of the sealing plate structure of the disposable precision filtering infusion set with a needle proposed by the present invention;

[0022] Figure 6 This is an enlarged view of structure A of the disposable precision filtering infusion set with a needle proposed by the present invention.

[0023] In the figure: 1 a fixing seat, 2 a first infusion tube, 3 a bottle stopper puncture needle, 4 a second infusion tube, 5 a flow restrictor, 6 a needle, 7 a dosing tube, 8 a mounting plate, 9 a mounting tube, 10 a mounting ring, 11 an L-shaped tube, 12 a connecting seat, 13 a connecting chamber, 14 a fixing plate, 15 a connecting tube, 16 a blade, 17 a rotating seat, 18 a flow chamber, 19 a stirring shaft, 20 a sliding ring, 21 a mounting rod, 22 a sealing plate, 23 a tapered hole, 24 a sphere, 25 a push rod, and 26 a limit spring. DETAILED DESCRIPTION

[0024] The present invention will be further explained below in conjunction with specific embodiments.

[0025] Embodiment 1

[0026] refer to Figure 1-6 In this embodiment, a disposable precision filtering infusion set with a needle is proposed, comprising a fixed seat 1, a mounting chamber is provided on the fixed seat 1, and a first infusion tube 2 and a second infusion tube 4 are fixedly installed on the top inner wall and the bottom inner wall of the mounting chamber respectively, the ends of the first infusion tube 2 and the second infusion tube 4 that are away from each other extend to the top and bottom of the fixed seat 1 respectively and are fixedly installed with a bottle stopper puncture needle 3 and a needle 6 respectively, and a flow limiter 5 is provided on the second infusion tube 4, the ends of the first infusion tube 2 and the second infusion tube 4 that are close to each other are fixedly installed with a mounting plate 8, and the two mounting plates 8 are sealed and fixedly connected with the same mounting tube 9, the first infusion tube 2 and the second infusion tube 4 are both connected to the mounting tube 9, a medicine film is fixedly installed in the mounting tube 9, a dosing tube 7 is fixedly installed on one side of the top of the fixed seat 1, the bottom end of the dosing tube 7 passes through the mounting plate 8 located above and extends into the mounting tube 9, and an L-shaped tube 11 is sealed and fixedly installed in the dosing tube 7.

[0027] In this embodiment, a mounting ring 10 is fixedly mounted on one side of the two mounting plates 8 that are close to each other, and the two mounting rings 10 are sealed and fixedly connected to the inner wall of the mounting tube 9 .

[0028] In this embodiment, a fixing rod is fixedly installed in the installation chamber, and a connecting pipe 15 is rotatably connected to the fixing rod. The top of the connecting pipe 15 is rotatably connected to a connecting seat 12. A connecting chamber 13 is provided on the connecting seat 12. The top of the connecting pipe 15 extends into the connecting chamber 13. Connecting holes are provided on the top inner walls on both sides of the connecting pipe 15, and the two connecting holes are both located in the connecting chamber 13. Two stirring shafts 19 are symmetrically fixedly installed at the bottom end of the connecting pipe 15, and the bottom end of the L-shaped tube 11 extends into the connecting chamber 13.

[0029] In this embodiment, a fixed plate 14 is fixedly installed on the top of the connecting tube 15, and a plurality of blades 16 are fixedly installed on the fixed plate 14 at equal intervals. A rotating seat 17 is fixedly installed on the bottom of the connecting tube 15, and a flow chamber 18 is provided on the rotating seat 17. Two stirring shafts 19 are respectively fixedly installed on both sides of the bottom of the rotating seat 17. A flow groove is provided on the top of the stirring shaft 19. Through holes are provided on the inner walls on both sides of the bottom of the flow chamber 18, and the flow groove is connected with the through holes. A plurality of flow holes are evenly spaced on the inner walls on both sides of the flow groove.

[0030] In this embodiment, a sealing plate 22 is sealed and fixedly installed on the inner wall of the dosing tube 7, and a sliding ring 20 is sealed and slidably connected to the inner wall of the dosing tube 7. A conical hole 23 is opened on the sealing plate 22, and a ball 24 is sealed and fitted in the conical hole 23. The sliding ring 20 is fixedly connected to the ball 24.

[0031] In this embodiment, a mounting rod 21 is fixedly mounted on the inner wall of the sliding ring 20 , a push rod 25 is fixedly mounted on one side of the mounting rod 21 , and one end of the push rod 25 extends into the tapered hole 23 and is fixedly connected to the ball 24 .

[0032] In this embodiment, a limiting rod is fixedly installed on the inner wall of the tapered hole 23, and a limiting hole is provided on the limiting rod. The push rod 25 passes through the limiting hole and is slidably connected to the inner wall of the limiting hole.

[0033] In this embodiment, a limit spring 26 is sleeved on the push rod 25 , and the limit spring 26 is located between the limit rod and the mounting rod 21 . Two ends of the limit spring 26 are fixedly connected to the mounting rod 21 and the limit rod, respectively.

[0034] Embodiment 2

[0035] refer to Figure 1-6In this embodiment, a disposable precision filter infusion set with a needle is proposed, comprising a fixing seat 1, a mounting chamber is provided on the fixing seat 1, and a first infusion tube 2 and a second infusion tube 4 are respectively bonded to the top inner wall and the bottom inner wall of the mounting chamber, the first infusion tube 2 and the second infusion tube 4 are respectively extended to the upper and lower ends of the fixing seat 1 away from each other and are respectively fixedly mounted with a bottle stopper puncture needle 3 and a needle 6, and a flow restrictor 5 is provided on the second infusion tube 4, and a mounting plate 8 is bonded to the ends of the first infusion tube 2 and the second infusion tube 4 close to each other, and the two mounting plates 8 are sealed and bonded with the same mounting plate. The first infusion tube 2 and the second infusion tube 4 are both connected to the installation tube 9, a drug film is bonded inside the installation tube 9, a dosing tube 7 is bonded to one side of the top of the fixing seat 1, the bottom end of the dosing tube 7 passes through the mounting plate 8 located above and extends into the installation tube 9, an L-shaped tube 11 is sealed and welded inside the dosing tube 7, when dosing is needed, a syringe is first inserted into the dosing tube 7, and the sliding ring 20 is pushed to move, when the sliding ring 20 moves, the ball 24 can be driven to move by the push rod 25, when the ball 24 moves, the dosing tube 7 can be in an open state, at this time The syringe can be pushed to push the medicine to be added into the medicine adding tube 7. At this time, the medicine will impact the blades 16, thereby driving the connecting tube 15 to rotate. When the connecting tube 15 rotates, the two stirring shafts 19 can be driven by the rotating seat 17 to move in a circular manner. At the same time, the medicine entering the connecting chamber 13 will flow into the mounting tube 9 through the connecting tube 15, the flow chamber 18, the flow groove and the flow hole, and mix with the medicine in the infusion bottle. Since the stirring shaft 19 moves in a circular manner, the mixed medicine is filtered through the medicine film, and the insoluble microorganisms in the medicine can be removed. The particles are filtered, so when the medicine liquid enters the mounting tube 9, it will be mixed and stirred with the medicine liquid in the infusion bottle and evenly flow into the patient's blood vessels. The present invention pushes the medicine liquid into the connecting chamber 13 and impacts the blades 16, so that the medicine liquid can be pushed into the mounting tube 9 and mixed and stirred with the medicine liquid in the mounting tube 9. After that, the insoluble particles in the medicine liquid can be filtered by the medicine film, so as to prevent the insoluble particles from entering the patient's body, so as not to cause harm to the patient's body, and when adding the medicine, it can be fully stirred with the medicine liquid in the infusion bottle.

[0036] In this embodiment, mounting rings 10 are bonded to the sides of the two mounting plates 8 that are close to each other, and the two mounting rings 10 are sealingly bonded to the inner wall of the mounting tube 9. The mounting rings 10 can be used to achieve a sealed and fixed connection between the mounting tube 9 and the mounting plate 8.

[0037] In this embodiment, a fixing rod is bonded in the installation chamber, and a connecting tube 15 is rotatably connected to the fixing rod, the top of the connecting tube 15 is rotatably connected to a connecting seat 12, a connecting chamber 13 is provided on the connecting seat 12, the top of the connecting tube 15 extends into the connecting chamber 13, connecting holes are provided on the top inner walls on both sides of the connecting tube 15, and the two connecting holes are both located in the connecting chamber 13, two stirring shafts 19 are symmetrically bonded to the bottom end of the connecting tube 15, and the bottom end of the L-shaped tube 11 extends into the connecting chamber 13, so as to facilitate the flow of the added liquid medicine and realize the flow of the liquid medicine into the installation tube 9.

[0038] In this embodiment, a fixed plate 14 is bonded to the top of the connecting tube 15, and a plurality of blades 16 are welded on the fixed plate 14 at equal intervals. A rotating seat 17 is bonded to the bottom of the connecting tube 15, and a flow chamber 18 is provided on the rotating seat 17, and two stirring shafts 19 are respectively bonded to the two sides of the bottom of the rotating seat 17, and a flow groove is opened at the top of the stirring shaft 19, and through holes are opened on the inner walls on both sides of the bottom of the flow chamber 18, and the flow groove is connected with the through holes, and a plurality of flow holes are opened on the inner walls on both sides of the flow groove at equal intervals. The impact force of the liquid medicine can be used to drive the blades 16 to rotate, and further drive the stirring shaft 19 to perform annular displacement.

[0039] In this embodiment, a sealing plate 22 is sealed and bonded to the inner wall of the dosing tube 7, and a sliding ring 20 is sealed and slidably connected to the inner wall of the dosing tube 7. A conical hole 23 is opened on the sealing plate 22, and a sphere 24 is sealed and fitted in the conical hole 23. The sliding ring 20 and the sphere 24 are welded to each other, and the sphere 24 can be used to achieve the effect of sealing the dosing tube 7.

[0040] In this embodiment, a mounting rod 21 is welded on the inner wall of the sliding ring 20, and a push rod 25 is welded on one side of the mounting rod 21. One end of the push rod 25 extends into the tapered hole 23 and is fixedly connected to the sphere 24. The mounting rod 21 and the push rod 25 can be used to achieve a fixed connection between the sphere 24 and the sliding ring 20.

[0041] In this embodiment, a limiting rod is welded on the inner wall of the tapered hole 23, and a limiting hole is provided on the limiting rod. The push rod 25 passes through the limiting hole and is slidably connected to the inner wall of the limiting hole. The limiting rod can be used to slide the ball 24 to limit the position.

[0042] In this embodiment, a limit spring 26 is sleeved on the push rod 25, and the limit spring 26 is located between the limit rod and the mounting rod 21. The two ends of the limit spring 26 are respectively welded to the mounting rod 21 and the limit rod. The limit spring 26 can be used to elastically limit the sphere 24, so that under normal conditions, the sphere 24 and the inner wall of the tapered hole 23 are sealed and fitted.

[0043] In this embodiment, when the patient is given infusion therapy, the medicine will flow from the infusion bottle through the first infusion tube 2, the installation tube 9, the second infusion tube 4 and the needle 6 in sequence, and finally flow into the patient's blood vessels, and the flow rate of the medicine can be controlled by the flow restrictor 5. When it is necessary to add medicine during this period, first use a syringe to insert it into the medicine adding tube 7, and push the sliding ring 20 to move. When the sliding ring 20 moves, the ball 24 can be driven to move by the push rod 25. When the ball 24 moves, the medicine adding tube 7 can be in an open state. At this time, the syringe can be pushed to push the medicine to be added into the medicine adding tube 7. At this time, the medicine will flow through the medicine adding tube 7 and the L-shaped tube 11, and the caliber of the L-shaped tube 11 is smaller than the caliber of the medicine adding tube 7. Therefore, when the medicine flows out, the pressure will be relatively large. At this time, the medicine will impact the blades 16, so that it can bring The movable connecting tube 15 is rotated. When the connecting tube 15 rotates, the two stirring shafts 19 can be driven by the rotating seat 17 to move in a circle. At the same time, the medicine liquid entering the connecting chamber 13 will flow into the mounting tube 9 through the connecting tube 15, the flow chamber 18, the flow groove and the flow hole, and mix with the medicine liquid in the infusion bottle. Since the stirring shaft 19 moves in a circle, the mixed medicine liquid is filtered through the medicine film, and the insoluble particles in the medicine liquid can be filtered. Therefore, when the medicine liquid enters the mounting tube 9, it will be mixed and stirred with the medicine liquid in the infusion bottle and evenly flow into the patient's blood vessels. The insoluble particles in the medicine liquid can be filtered by the medicine film, so as to prevent the insoluble particles from entering the patient's body, so it will not cause damage to the patient's body. When adding medicine, it can be fully stirred with the medicine liquid in the infusion bottle.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A disposable precision filter infusion set with a needle, comprising a fixing seat (1), a mounting chamber being provided on the fixing seat (1), and a first infusion tube (2) and a second infusion tube (4) being fixedly mounted on the top inner wall and the bottom inner wall of the mounting chamber, respectively, the first infusion tube (2) and the second infusion tube (4) having ends away from each other extending to the top and the bottom of the fixing seat (1) respectively and being fixedly mounted with a bottle stopper puncture needle (3) and a needle head (6), respectively, and a flow restrictor (5) being provided on the second infusion tube (4), characterized in that: The first infusion tube (2) and the second infusion tube (4) are fixedly mounted with a mounting plate (8) at their ends close to each other, and the two mounting plates (8) are sealed and fixedly connected to the same mounting tube (9), the first infusion tube (2) and the second infusion tube (4) are both connected to the mounting tube (9), a drug film is fixedly mounted inside the mounting tube (9), a drug adding tube (7) is fixedly mounted on one side of the top of the fixing seat (1), the bottom end of the drug adding tube (7) passes through the mounting plate (8) located above and extends into the mounting tube (9), an L-shaped tube (11) is sealed and fixedly mounted inside the drug adding tube (7), a fixing rod is fixedly mounted inside the mounting chamber, and a connecting tube (15) is rotatably connected to the fixing rod, the top of the connecting tube (15) is rotatably connected to a connecting seat (12), a connecting chamber (13) is provided on the connecting seat (12), and the top end of the connecting tube (15) extends to the connecting chamber (13) The connecting tube (15) has two connecting holes formed on the inner walls of the top on both sides, and the two connecting holes are both located in the connecting chamber (13). Two stirring shafts (19) are symmetrically fixedly mounted on the bottom end of the connecting tube (15), and the bottom end of the L-shaped tube (11) extends into the connecting chamber (13). A fixing plate (14) is fixedly mounted on the top end of the connecting tube (15), and a plurality of blades (16) are fixedly mounted on the fixing plate (14) at equal intervals. A rotating seat (17) is fixedly mounted on the bottom of the connecting tube (15), and a flow chamber (18) is provided on the rotating seat (17). The two stirring shafts (19) are respectively fixedly mounted on the two sides of the bottom of the rotating seat (17). A flow groove is formed on the top end of the stirring shaft (19). Through holes are formed on the inner walls on both sides of the bottom of the flow chamber (18), and the flow grooves are connected to the through holes. A plurality of flow holes are evenly spaced on the inner walls on both sides of the flow groove.

2. The disposable precision filtration infusion set with needle according to claim 1, characterized in that: A mounting ring (10) is fixedly mounted on one side of the two mounting plates (8) that is close to each other, and the two mounting rings (10) are sealed and fixedly connected to the inner wall of the mounting tube (9).

3. The disposable precision filtration infusion set with needle according to claim 1, characterized in that: A sealing plate (22) is fixedly and sealingly mounted on the inner wall of the dosing tube (7), and a sliding ring (20) is sealingly and slidably connected to the inner wall of the dosing tube (7). A conical hole (23) is formed on the sealing plate (22), a ball (24) is sealingly fitted in the conical hole (23), and the sliding ring (20) is fixedly connected to the ball (24).

4. The disposable precision filtration infusion set with needle according to claim 3, characterized in that: A mounting rod (21) is fixedly mounted on the inner wall of the sliding ring (20), a push rod (25) is fixedly mounted on one side of the mounting rod (21), and one end of the push rod (25) extends into the tapered hole (23) and is fixedly connected to the ball (24).

5. The disposable precision filtering infusion set with needle according to claim 3, characterized in that: A limit rod is fixedly mounted on the inner wall of the tapered hole (23), and a limit hole is provided on the limit rod. The push rod (25) passes through the limit hole and is slidably connected to the inner wall of the limit hole.

6. The disposable precision filtration infusion set with needle according to claim 4, characterized in that: A limit spring (26) is sleeved on the push rod (25), the limit spring (26) is located between the limit rod and the mounting rod (21), and two ends of the limit spring (26) are respectively fixedly connected to the mounting rod (21) and the limit rod.

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