Double-face filtering exhaust type filter and using method thereof

Abstract

The invention discloses a double-face filtering exhaust type filter and a using method thereof, and relates to the field of medical instruments, a first micron filtering membrane is arranged on the upper side in the filter, a second micron filtering membrane is arranged on the lower side in the filter, and the filtering aperture of the first micron filtering membrane is larger than that of the second micron filtering membrane; a graded filtering structure is formed in the filter through the aperture difference of the first micron filtering membrane and the second micron filtering membrane, impurities with large particle sizes are intercepted firstly, then fine impurities are filtered, various impurities in liquid medicine can be comprehensively blocked, the pipeline blocking risk is effectively avoided, meanwhile, the impurities are prevented from stimulating blood vessels of a patient, the safety of the infusion process is guaranteed, and the safety of the infusion process is improved. The first micron filtering membrane and the second micron filtering membrane adopt a conical design, and the wider ends are oppositely arranged, so that the contact area with the liquid medicine is greatly increased.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and in particular relates to a double-sided filtering and air exhausting filter and a method for using the same. BACKGROUND

[0002] The double-sided filtering and air exhausting filter is mainly applied in the pipeline of an intravenous infusion device and a syringe pump, filters particulate impurities in the medicine liquid, and exhausts air in the pipeline to prevent air embolism.

[0003] The infusion device is mainly used to establish a channel between a vein and a medicine liquid for intravenous infusion, and mainly comprises the following parts: a venous needle or a syringe needle, a needle cap, an infusion hose, a medicine liquid filter, a drip bottle, and an air filter. The venous needle or the syringe needle is used for venipuncture and is connected to the infusion device for intravenous infusion of the medicine liquid. The venous needle or the syringe needle is a key part of the infusion device that contacts the human body and must be sterile and sharp to smoothly puncture the vein. The needle cap is used to protect the venous needle or the syringe needle from being contaminated and from injuring others. Before infusion, the medical staff removes the cap and properly disposes of it after the infusion. The infusion hose has the function of guiding the infusion and is connected to the venous needle and an infusion container (such as an infusion bottle or an infusion bag) to smoothly flow the medicine liquid into the human body. For special medicine that needs to be infused in the dark, a disposable infusion device that avoids light is used to avoid the adverse effects of light on the medicine. The medicine liquid filter is located in the infusion hose and is used to filter particulate impurities in the medicine liquid.

[0004] The utility model patent CN223208761U discloses an air exhausting infusion device, which comprises an infusion tube, an injection needle, a flow rate regulator, a drip bottle, and a bottle plug puncture needle arranged in sequence on the infusion tube, a precision medicine liquid filter arranged on the infusion tube near the drip bottle, a catheter, and a liquid stopping clamp. The drip bottle side is provided with an air hole, and the air hole is provided with a connecting pipe. One end of the catheter is connected with the connecting pipe, and the other end is used for being connected with the air storage cavity or the air exhaust end of the precision medicine liquid filter. The liquid stopping clamp is arranged on the catheter.

[0005] Although the infusion device can avoid air accumulation, the filter on the existing infusion device adopts a micrometer filter membrane. If there are large rubber chips, glass particles, and pipeline falling impurities in the medicine liquid, the micrometer filter membrane is easy to be blocked. Once blocked, the efficiency of the infusion is affected, or the blocked filter membrane increases the probability of blood return. Therefore, the present application is proposed. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a double-sided filtering and air exhausting filter that can overcome the above problems or at least partially solve the above problems.

[0007] To solve the above technical problems, the basic idea of the technical solution of the present application is: The application discloses a double-face filtering exhaust type filter, which is arranged on a main pipeline, the upper end of the filter is provided with the main pipeline, a drip pot is arranged on the main pipeline, a transfusion bottle is inserted into the main pipeline, a connecting pipeline is arranged at the bottom of the filter, a transfusion needle is arranged at the tail end of the connecting pipeline, a first micron filter membrane is arranged at the upper side of the inside of the filter, and a second micron filter membrane is arranged at the lower side of the inside of the filter, the filter hole diameter of the first micron filter membrane is larger than that of the second micron filter membrane.

[0008] Further, the first micron filter membrane and the second micron filter membrane are conical, and the wider ends of the first micron filter membrane and the second micron filter membrane are oppositely arranged.

[0009] Further, the first micron filter membrane is internally provided with a filter membrane support, and the second micron filter membrane is externally provided with a filter membrane support, the filter membrane support is used for supporting the first micron filter membrane and the second micron filter membrane.

[0010] Further, the filter membrane support comprises a clamping ring body, a plurality of inclined supporting plates and a filtering cavity, each of the inclined supporting plates is fixedly connected with the clamping ring body, and the space between every two inclined supporting plates is the filtering cavity.

[0011] Further, the filter comprises a first shell and a second shell, an internally threaded pipe is fixedly connected with the bottom of the first shell near the outer edge, an externally threaded pipe is fixedly connected with the upper end of the inner edge of the second shell, and the externally threaded pipe is threadedly connected with the internally threaded pipe.

[0012] Further, the externally threaded pipe is provided with an inwardly extending L-shaped trailer near the inner edge of the upper end, the bottom of the clamping ring body on the upper side is in contact with the upper end of the L-shaped trailer, and the first shell is internally provided with a clamping convex ring.

[0013] Further, the second shell is provided with a supporting flange on the inner wall near the bottom of the externally threaded pipe, the inner diameter of the supporting flange is smaller than the inner diameter of the L-shaped trailer, the diameter of the clamping ring body on the filter membrane support in the second micron filter membrane is smaller than the diameter of the clamping ring body on the filter membrane support outside the first micron filter membrane.

[0014] Further, the second shell is internally provided with an inclined surface, and the wider end of the second shell is located between the second micron filter membrane and the first micron filter membrane.

[0015] Further, the upper end of the filter is provided with an exhaust pipe, and the tail end of the exhaust pipe is provided with a one-way valve.

[0016] The application further discloses a use method of the double-face filtering exhaust type filter, which is based on the double-face filtering exhaust type filter and comprises the following steps. S1, the infusion bottle is connected with the main pipeline, the liquid medicine flows out from the infusion bottle into the main pipeline, and after the stable flow rate of the drip bottle, it continuously flows into the filter inside; S2, the liquid medicine first contacts the first micron filter membrane on the upper side of the filter inside, and the larger particle size impurities in the liquid medicine are intercepted through the larger filter pore diameter; the liquid medicine after preliminary filtration continues to flow downward, passes through the second micron filter membrane on the lower side of the filter inside, and filters the remaining fine impurities by using the smaller filter pore diameter, so that two-stage fractional filtration is realized; S3, by means of the conical structure of the first micron filter membrane and the second micron filter membrane and the layout of the relatively wide end, the contact area of the filter membrane and the liquid medicine is increased, the liquid medicine filtration amount per unit time is improved, and the liquid medicine passing rate is accelerated; S4, the filtered liquid medicine output step: the clean liquid medicine after removing impurities through two-stage filtration is conveyed to the infusion needle through the connecting pipeline at the bottom of the filter, and finally infused into the patient's vein.

[0017] After adopting the above technical scheme, the present application has the following beneficial effects compared with the prior art: The filter inside the present application forms a fractional filtration structure through the pore diameter difference of the first micron filter membrane and the second micron filter membrane, first intercepts larger particle size impurities, and then filters fine impurities, which can block all kinds of impurities in the liquid medicine, effectively avoid the risk of pipeline blockage, prevent impurities from stimulating the patient's blood vessels, and ensure the safety of the infusion process; the first micron filter membrane and the second micron filter membrane are designed in a conical shape and relatively arranged at the wider end, which greatly increases the contact area with the liquid medicine; in combination with the guiding effect of the inclined supporting plate of the filter membrane support and the drainage effect of the filter chamber, the liquid medicine flow speed is accelerated, the filtration amount per unit time is improved, and it is ensured that the liquid medicine can quickly and smoothly pass through the filter, meeting the requirements of infusion rate in different clinical scenarios.

[0018] The specific embodiments of the present application will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] In the drawings: Figure 1 It is a double-face filtration and exhaust type filter structure schematic diagram of the present application; Figure 2 It is a front structure schematic diagram of the double-face filtration and exhaust type filter of the present application; Figure 3 It is a side structure schematic diagram of the double-face filtration and exhaust type filter of the present application; Figure 4 It is a filter cross-sectional structure schematic diagram of the present application; Figure 5 It is a Figure 4 It is an enlarged structure schematic diagram of part A of the present application; Figure 6For the present invention Figure 4 Enlarged structural diagram of section B; Figure 7 This is a schematic diagram of the filter membrane support structure of the present invention; Figure 8 This is a schematic diagram of the liquid flow and exhaust process of the present invention.

[0020] In the diagram: 100, infusion bottle; 101, main pipeline; 102, drip chamber; 103, connecting pipeline; 104, infusion needle; 200. Filter; 201. Exhaust pipe; 202. One-way valve; 203. First micron filter membrane; 204. Second micron filter membrane; 205. First housing; 206. Second housing; 207. Internally threaded pipe; 208. Externally threaded pipe; 209. L-shaped support; 210. Support flange; 211. Filter membrane support; 212. Snap-fit ​​ring; 213. Inclined support plate; 214. Filter chamber. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] Reference Figures 1-3 This is a schematic diagram of a double-sided filtration exhaust type filter structure in this embodiment. In this embodiment, the filter 200 is mounted on the main pipe 101, a drip chamber 102 is mounted on the main pipe 101, an infusion bottle 100 is inserted into the main pipe 101, a connecting pipe 103 is mounted at the bottom of the filter 200, an infusion needle 104 is mounted at the end of the connecting pipe 103, and an exhaust pipe 201 is mounted at the upper end of the filter 200, with a one-way valve 202 at the end of the exhaust pipe 201. In this example, the medication enters the main pipeline 101 through the infusion bottle 100, passes through the filter 200, and then enters the connecting pipeline 103. Finally, it is injected into the vein through the infusion needle 104. The filter 200 can filter out impurities in the medication, and the gas in the pipeline can be discharged outward through the exhaust pipe 201 and the one-way valve 202. The one-way valve 202 can prevent external air containing bacteria from entering the pipeline, and the exhaust function can reduce the problem of air bubbles trapped in the medication due to its high viscosity.

[0023] like Figure 4As shown, this is a cross-sectional view of the filter in this embodiment. A first micron-sized filter membrane 203 is disposed on the upper inner side of the filter 200, and a second micron-sized filter membrane 204 is disposed on the lower inner side of the filter 200. The pore size of the first micron-sized filter membrane 203 is larger than that of the second micron-sized filter membrane 204. In this embodiment, by setting the pore size of the first micron-sized filter membrane 203 to be larger than that of the second micron-sized filter membrane 204, graded filtration is achieved. The specific filtration flow direction is as follows... Figure 8 As shown, it can effectively block impurities and prevent tubing blockage or vascular irritation in patients.

[0024] To increase the throughput of the drug solution and the contact area between the first micron filter membrane 203 and the second micron filter membrane 204 and the drug solution, the specific structure can be as follows: Figure 4 In the embodiment shown, the first micron filter membrane 203 and the second micron filter membrane 204 are conical. The first micron filter membrane 203 has a filter membrane support 211 inside, and the second micron filter membrane 204 has a filter membrane support 211 outside. The filter membrane support 211 is used to support the first micron filter membrane 203 and the second micron filter membrane 204. The wider ends of the first micron filter membrane 203 and the second micron filter membrane 204 are arranged opposite to each other. In this embodiment, the conical arrangement of the first micron filter membrane 203 and the second micron filter membrane 204 results in a larger contact area with the drug solution and an increased filtration rate per unit time.

[0025] like Figure 7 As shown, this is a schematic diagram of the filter membrane support structure in this embodiment. The filter membrane support 211 includes a snap-fit ​​ring 212, inclined support plates 213, and a filter chamber 214. There are multiple inclined support plates 213, and each inclined support plate 213 is fixedly connected to the snap-fit ​​ring 212. The space between every two inclined support plates 213 is the filter chamber 214. In this embodiment, the inclined support plates 213 can guide the flow of the drug solution. The filter chamber 214 above allows the filtered drug solution to flow downwards, increasing the flow effect of the drug solution and making the filtration speed of the drug solution faster. In addition, the cavity supported by the filter membrane supports 211 on both sides can store a large amount of air. When there is too much air in the pipeline, it is pre-stored and then slowly discharged, which can prevent too much air from entering the patient's vein.

[0026] like Figure 5 As shown, this is the embodiment of the present invention. Figure 4The enlarged structural diagram of part A shows that, due to the different sizes of impurities and the different viscosities of different medicinal solutions, the pore sizes of the first micron filter membrane 203 and the second micron filter membrane 204 need to be changed according to the type of medicinal solution. In this embodiment, the filter 200 includes a first outer shell 205 and a second outer shell 206. An internally threaded tube 207 is fixedly connected to the bottom of the first outer shell 205 near its outer edge, and an externally threaded tube 208 is fixedly connected to the upper inner edge of the second outer shell 206. The externally threaded tube 208 and the internally threaded tube 207 are threadedly connected. In this embodiment, by adopting a split and detachable design for the first outer shell 205 and the second outer shell 206, the first micron filter membrane 203 and the second micron filter membrane 204 inside the filter 200 can be disassembled and replaced. This allows for the selection of different combinations of first micron filter membranes 203 and second micron filter membranes 204 according to different medicinal solutions, making the filter 200 more widely applicable.

[0027] like Figure 6 As shown, this is the embodiment of the present invention. Figure 4 The enlarged structural diagram of part B shows that, in order to facilitate the installation and disassembly of the first micron filter membrane 203 and its external filter membrane support 211, in this embodiment, an inwardly extending L-shaped support 209 is provided near the upper inner edge of the external threaded tube 208. The bottom of the upper snap-fit ​​ring 212 contacts the upper end of the L-shaped support 209. A snap-fit ​​protrusion is provided inside the first outer shell 205. In this embodiment, when installing the first micron filter membrane 203, the narrower end of the first micron filter membrane 203 is placed into the first outer shell 205 with the inner side facing it. After the snap-fit ​​ring 212 contacts the snap-fit ​​protrusion inside the first outer shell 205, it is limited. Then, after the second outer shell 206 is connected to the first outer shell 205, the bottom of the snap-fit ​​ring 212 is held in place by the L-shaped support 209, thus completing the replacement of the first micron filter membrane 203 and its internal filter membrane support 211.

[0028] The specific structure for replacing the second-micron filter membrane 204 and its internal filter support 211 can be as follows: Figure 6In the embodiment shown, a support flange 210 is provided on the inner wall of the second outer shell 206 near the bottom of the external threaded tube 208. The inner diameter of the support flange 210 is smaller than the inner diameter of the L-shaped support table 209. The diameter of the snap ring 212 on the filter membrane support 211 inside the second micron filter membrane 204 is smaller than the diameter of the snap ring 212 on the filter membrane support 211 outside the first micron filter membrane 203. In this embodiment, when replacing the second micron filter membrane 204, the snap ring 212 on the filter membrane support 211 inside the second micron filter membrane 204 is inserted into the interior of the external threaded tube 208. The snap ring 212 is supported by the support flange 210. Then, the first micron filter membrane 203 and its internal filter membrane support 211 are installed, thereby completing the replacement of the second micron filter membrane 204 and its internal filter membrane support 211, and leaving a cavity between the first micron filter membrane 203 and the second micron filter membrane 204.

[0029] To facilitate the upward floating of bubbles, the specific structure can be as follows: Figure 4 In the embodiment shown, the interior of the second outer shell 206 is provided with an inclined surface. The wider end of the interior of the second outer shell 206 is located between the second micron filter membrane 204 and the first micron filter membrane 203. In this embodiment, the bubbles in the liquid medicine have a natural tendency to rise because their density is much smaller than that of the liquid. Through the conical structure with a wider surface and a narrower bottom inside the conical surface of the second outer shell 206, the rising bubbles can be more easily gathered in a wider area, avoiding the bubbles from being dispersed and stagnant in a narrow space. At the same time, the inclined inner wall of the cone can guide the bubbles to flow in a directional direction towards the top exhaust pipe 201 and the one-way valve 202, shortening the path of the bubbles to the exhaust port.

[0030] This embodiment also discloses a method for using a dual-sided filtration exhaust filter, the method comprising the following steps: S1. Connect the infusion bottle 100 to the main pipeline 101. The medicine flows out of the infusion bottle 100 and into the main pipeline 101. After the flow rate is stabilized by the dripper 102, it continues to flow into the filter 200. S2. The liquid medicine first comes into contact with the first micron filter membrane 203 on the upper side of the inside of the filter 200, which intercepts larger particles of impurities in the liquid medicine through its larger pore size. The liquid medicine that has been initially filtered continues to flow downward and passes through the second micron filter membrane 204 on the lower side of the inside of the filter 200, which filters out the remaining fine impurities through its smaller pore size, thus achieving two-stage filtration. S3. By utilizing the conical structure of the first micron filter membrane 203 and the second micron filter membrane 204 and their relatively wide ends being arranged opposite each other, the contact area between the filter membrane and the liquid is increased, the amount of liquid filtered per unit time is increased, and the liquid throughput rate is accelerated. S4. Post-filtration drug output steps: The clean drug solution after removing impurities through two-stage filtration is delivered to the infusion needle 104 through the connecting pipe 103 at the bottom of the filter 200, and finally infused into the patient's vein.

[0031] In summary, the specific working principle of this embodiment is as follows: As a core component of the infusion system, this filter 200 achieves drug filtration, gas discharge, and flexible filter membrane replacement through multi-structure collaboration, ensuring the safety and efficiency of the infusion process.

[0032] After the medication flows out of the infusion bottle 100, it enters the main pipeline 101. After the flow rate is stabilized by the drip chamber 102, it flows into the filter 200. After passing through two stages of filtration, it enters the connecting pipeline 103 and is finally infused into the patient's vein through the infusion needle 104.

[0033] The first micron filter membrane 203 on the upper side and the second micron filter membrane 204 on the lower side of the filter 200 form a graded filtration structure. The pore size of the first micron filter membrane 203 is larger than that of the second micron filter membrane 204. It first intercepts larger particle impurities in the drug solution, and then filters out fine impurities through the second micron filter membrane 204. This effectively blocks various impurities and avoids blockage of the pipeline or stimulation of the patient's blood vessels.

[0034] Both the first-micron filter membrane 203 and the second-micron filter membrane 204 adopt a conical design and are positioned with their wider ends facing each other, which greatly increases the contact area with the liquid, improves the filtration volume per unit time, and accelerates the liquid's passage rate.

[0035] The filter membrane support 211 inside the filter membrane is fixed by the snap ring 212. Multiple inclined support plates 213 are connected to the snap ring 212. A filter chamber 214 is formed between adjacent inclined support plates 213. The inclined support plates 213 guide the flow of the drug solution. The filter chamber 214 promotes the downward flow of the filtered drug solution. At the same time, the cavity supported by the filter membrane supports 211 on both sides can store excess air in the pipeline and then slowly discharge it to prevent a large amount of air from entering the patient's vein.

[0036] The exhaust pipe 201 at the top of the filter 200 works in conjunction with the one-way valve 202 at the end to achieve the exhaust function. The gas in the pipeline is discharged to the outside through the exhaust pipe 201. The one-way valve 202 can block the entry of external bacteria-laden air into the pipeline and at the same time reduce the risk of infusion caused by the retention of air bubbles in high-viscosity medicine solutions.

[0037] The second outer shell 206 adopts a tapered inclined structure that is wider at the top and narrower at the bottom. Its wider end is located between the two-stage filter membrane. Taking advantage of the fact that the density of bubbles is less than that of liquids, the bubbles are guided to gather in a wider area, avoiding dispersion and retention. At the same time, the inclined inner wall guides the top exhaust pipe 201 and the one-way valve 202 to shorten the bubble discharge path and improve exhaust efficiency.

[0038] The filter 200 adopts a split design with a first outer shell 205 and a second outer shell 206. It is detachable and assembleable via a threaded connection between an internally threaded tube 207 and an externally threaded tube 208, facilitating the replacement of the internal filter membrane. The L-shaped support 209 inside the externally threaded tube 208 engages with the snap-fit ​​protrusion of the first outer shell 205 to limit and fix the first micron filter membrane 203 and its corresponding filter membrane support 211. The supporting flange 210 on the inner wall of the second outer shell 206 supports the filter membrane support 211 of the second micron filter membrane 204. Furthermore, the diameter of the snap-fit ​​ring 212 corresponding to the second micron filter membrane 204 is smaller than that of the snap-fit ​​ring 212 of the first micron filter membrane 203, ensuring that a cavity remains after the two-stage filter membranes are installed. This accommodates the replacement needs of different specifications of filter membrane combinations, expanding the applicability of the filter 200. Content not described in detail in this specification is prior art known to those skilled in the art.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention.

Claims

1. A double-sided filtration exhaust type filter, wherein the filter (200) is disposed on a main pipe (101), a drip chamber (102) is disposed on the main pipe (101), an infusion bottle (100) is inserted into the main pipe (101), a connecting pipe (103) is disposed at the bottom of the filter (200), and an infusion needle (104) is disposed at the end of the connecting pipe (103), characterized in that, A first micron filter membrane (203) is provided on the upper inside of the filter (200), and a second micron filter membrane (204) is provided on the lower inside of the filter (200). The pore size of the first micron filter membrane (203) is larger than that of the second micron filter membrane (204).

2. The double-sided filtration exhaust type filter according to claim 1, characterized in that, The first micron filter membrane (203) and the second micron filter membrane (204) are conical, with the wider ends of the first micron filter membrane (203) and the second micron filter membrane (204) arranged opposite each other.

3. The double-sided filtration exhaust type filter according to claim 2, characterized in that, The first micron filter membrane (203) has a filter membrane support (211) inside, and the second micron filter membrane (204) has a filter membrane support (211) outside. The filter membrane support (211) is used to support the first micron filter membrane (203) and the second micron filter membrane (204).

4. The double-sided filtration exhaust type filter according to claim 3, characterized in that, The filter membrane support (211) includes a snap ring (212), an inclined support plate (213), and a filter chamber (214). There are multiple inclined support plates (213), and each inclined support plate (213) is fixedly connected to the snap ring (212). The space between every two inclined support plates (213) is the filter chamber (214).

5. The double-sided filtration exhaust type filter according to claim 1, characterized in that, The filter (200) includes a first housing (205) and a second housing (206). An internally threaded tube (207) is fixedly connected to the bottom of the first housing (205) near the outer edge, and an externally threaded tube (208) is fixedly connected to the upper inner edge of the second housing (206). The externally threaded tube (208) and the internally threaded tube (207) are threaded together.

6. The double-sided filtration exhaust type filter according to claim 5, characterized in that, An L-shaped platform (209) extending inward is provided near the inner edge of the upper end of the external threaded pipe (208). The bottom of the upper snap ring body (212) contacts the upper end of the L-shaped platform (209). A snap ring protrusion is provided inside the first outer shell (205).

7. The double-sided filtration exhaust type filter according to claim 5 or 6, characterized in that, The second outer shell (206) has a support flange (210) on its inner wall near the bottom of the external threaded tube (208). The inner diameter of the support flange (210) is smaller than the inner diameter of the L-shaped drag table (209). The diameter of the snap ring (212) on the filter membrane support (211) inside the second micron filter membrane (204) is smaller than the diameter of the snap ring (212) on the filter membrane support (211) outside the first micron filter membrane (203).

8. The double-sided filtration exhaust type filter according to claim 1, characterized in that, The interior of the second housing (206) is provided with a slope, and the wider end of the interior of the second housing (206) is located between the second micron filter membrane (204) and the first micron filter membrane (203).

9. The double-sided filtration exhaust type filter according to claim 1, characterized in that, The filter (200) is provided with an exhaust pipe (201) at the upper end, and a one-way valve (202) is provided at the end of the exhaust pipe (201).

10. A method of using a double-sided filtration exhaust filter, based on the double-sided filtration exhaust filter of claim 2, characterized in that, Includes the following steps: S1. Connect the infusion bottle (100) to the main pipeline (101). The medicine flows out of the infusion bottle (100) and into the main pipeline (101). After the flow rate is stabilized by the dripper (102), it continues to flow into the filter (200). S2. The liquid first comes into contact with the first micron filter membrane (203) on the upper side of the filter (200), which intercepts larger particles of impurities in the liquid through its larger pore size. The liquid continues to flow downward after the initial filtration and passes through the second micron filter membrane (204) on the lower side of the filter (200), which filters the remaining fine impurities through its smaller pore size, thus achieving two-stage filtration. S3. By utilizing the conical structure of the first micron filter membrane (203) and the second micron filter membrane (204) and their relatively wide ends being arranged opposite each other, the contact area between the filter membrane and the liquid is increased, the amount of liquid filtered per unit time is increased, and the liquid throughput is accelerated. S4. Filtered drug output steps: The clean drug solution after removing impurities through two-stage filtration is delivered to the infusion needle (104) through the connecting pipe (103) at the bottom of the filter (200) and finally infused into the patient's vein.

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