CN113117397B

CN113117397B - Medical filter

Info

Publication number: CN113117397B
Application number: CN201911406951.8A
Authority: CN
Inventors: 贾建东; 陈玉道; 高庆文
Original assignee: Hangzhou Kebaite Technology Co ltd
Current assignee: Hangzhou Kebaite Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2023-01-03
Anticipated expiration: 2039-12-31
Also published as: CN113117397A

Abstract

The invention discloses a medical filter for transfusion, which comprises a main body and a side cover, wherein an inner cavity is formed between the main body and the side cover, the inner cavity comprises a first cavity and a second cavity, the first cavity is limited by the side cover, the main body and a filtering membrane, the second cavity is limited by the main body and the filtering membrane, two ends of the main body are respectively provided with a first channel for inflow of fluid and a second channel for outflow of fluid, and the medical filter is characterized in that: the inside of main part is equipped with the filter membrane mounting bracket, the filter membrane mounting bracket with be provided with the reposition of redundant personnel chamber between the export of first passageway, be equipped with reposition of redundant personnel portion in the reposition of redundant personnel intracavity, reposition of redundant personnel portion with the export counterpoint setting of first passageway, reposition of redundant personnel portion is fixed on the filter membrane mounting bracket, just reposition of redundant personnel portion is for the filter membrane mounting bracket orientation the direction of side cap is outstanding to be set up, the reposition of redundant personnel chamber with first cavity intercommunication, the second passageway with second cavity intercommunication. The invention aims to provide a medical filter for medical infusion, which can realize high-efficiency and precise filtration.

Description

Medical filter

Technical Field

The invention relates to a filter, in particular to a medical filter for transfusion.

Background

Intravenous injection is always an effective way for clinically rescuing critical patients and treating various diseases, can directly inject liquid medicine into blood, and can play the drug effect at the highest speed. However, the liquid medicine or the transfusion system itself always has inevitable insoluble particles, which is a problem for medical staff and patients. When these insoluble particles enter the human body through the drug solution, they may cause the microcirculation of the human body and organs to be clogged, and in severe cases, they may cause venous embolism and venous inflammation. Especially for patients requiring long-term infusion, the injury is unconsciously slow and the consequences are more serious. At present, when medicines are injected intravenously, hospitals usually use disposable intravenous infusion filters, so that most fine particles can be blocked in the filters, and the safety of patients is ensured.

In the utility model patent document with publication number US20020058913A1, a medical filter for infusion is disclosed, comprising a box-shaped body having a cavity, in which a filter channel is provided, so that the filtered liquid flows out of the filter through an outflow handle.

The chemical liquid filter should have a sufficient membrane area to ensure a sufficient flow rate. However, the prior art still has some problems which cannot be overcome, for example, due to the low utilization rate of the filter membrane, the medical filter has an excessively large shape and volume, which is inconvenient for medical staff to use, and the large volume also causes waste of the liquid medicine.

Disclosure of Invention

The invention aims to provide a medical filter for medical infusion, which can realize high-efficiency and precise filtration.

In order to achieve the purpose, the invention adopts the following technical scheme: a medical filter, includes main part and side cap, form the inner chamber between main part and the side cap, the inner chamber includes first cavity and second cavity, first cavity by side cap, main part and filtration membrane are injectd, the second cavity by main part and filtration membrane are injectd, the both ends of main part are equipped with the first passageway that supplies the fluid inflow and the second passageway that supplies the fluid outflow respectively, its characterized in that: the inside of main part is equipped with the filter membrane mounting bracket, the filter membrane mounting bracket with be provided with the reposition of redundant personnel chamber between the export of first passageway, be equipped with reposition of redundant personnel portion in the reposition of redundant personnel intracavity, reposition of redundant personnel portion with the export counterpoint setting of first passageway, reposition of redundant personnel portion is fixed on the filter membrane mounting bracket, just reposition of redundant personnel portion for the filter membrane mounting bracket orientation the direction of side cap is outstanding to be set up, the reposition of redundant personnel chamber with first cavity intercommunication, the second passageway with second cavity intercommunication.

The working principle of the invention is as follows: after the main body and the side cover are fixedly sleeved, the first channel is connected with an infusion tube of a medical infusion apparatus, liquid medicine enters the first cavity through the first channel, the liquid medicine enters the second cavity after being filtered by the filtering membrane under the action of pressure, and then the filtered liquid medicine flows out from the second channel which is connected to the intravenous needle; specifically, a shunting cavity is formed between the filter membrane mounting frame inside the main body and the first channel, the shunting cavity is communicated with the first cavity, a shunting part is arranged inside the shunting cavity, and the shunting part protrudes from the filter membrane mounting frame relative to the shunting part and is arranged on the shunting cavity. When the medical filter is provided with only one first cavity, namely the medical filter is provided with only one side cover and one main body, the shunting chamber can buffer partial potential energy of the medical liquid, and the medical liquid with the potential energy is prevented from directly contacting the filtering membrane to cause deformation or damage of filtering; when the medical filter consists of two side covers and a main body, the medical filter at the moment is provided with two first cavities, and the shunting cavity can buffer partial potential energy of liquid medicine and distribute the liquid medicine, so that the liquid medicine with uniform flow in the two first cavities is ensured. Because liquid can tend to flow along the shortest path and the path of minimum resistance, consequently when the liquid medicine gets into first cavity from the reposition of redundant personnel chamber, can assemble into a share of liquid medicine and flow along the same path, and other regions then can form the dead zone that the liquid medicine flows, consequently filterable membrane's effective utilization area greatly reduced, and because filtration membrane fixes on the filter membrane mounting bracket, the liquid medicine that gets into first cavity from the reposition of redundant personnel chamber is along the fixed department that tangential continuation scour filtration membrane and filter membrane mounting bracket, influence the steadiness of filtration membrane on the filter membrane mounting bracket. The shunting part positioned on the filter membrane mounting frame can reduce the scouring force of the liquid medicine to the fixed part of the filter membrane, and prolong the service life of the medical filter. Moreover, because reposition of redundant personnel portion and first passageway counterpoint the setting, consequently the reposition of redundant personnel portion can be effectual will get into the liquid medicine dispersion of first cavity and come, with the effect maximize of reposition of redundant personnel portion, the flow distribution area of increase liquid medicine has improved the utilization ratio of filter membrane.

Further, the flow dividing portion is located on the central axis of the second chamber, a perpendicular distance between the flow dividing portion and the center of the first passage outlet is denoted by H, a width of the flow dividing portion in a direction perpendicular to the central axis of the first passage is denoted by W, an angle between the center of the first passage outlet and the width W of the flow dividing portion is denoted by θ, and H, W, and θ satisfy: θ =2arctan (W/2H), wherein θ has a value range of: theta is more than 20 degrees and less than 90 degrees.

The reposition of redundant personnel portion is located the axis of second cavity on, and such design can be with the liquid medicine maximum contact filtration membrane through reposition of redundant personnel portion dispersion, increases filtration membrane's effective utilization area, improves filtration membrane's utilization ratio. The perpendicular distance of the center of the first channel outlet is recorded as H, the width of the flow dividing part in the direction perpendicular to the central axis of the first channel is recorded as W, and the included angle between the center of the first channel outlet and the width W of the flow dividing part is =2arctan (W/2H). If theta is less than or equal to 20 degrees, the volume of the shunting part in the shunting cavity is too small, and when the liquid medicine enters the first cavity from the shunting cavity, the shunting part has small dispersion effect on the liquid medicine, so that the filtering membrane cannot be fully utilized; when theta is larger than or equal to 90 degrees, the volume occupied by the shunt part in the shunt cavity is too large, so that the flow of the liquid medicine is blocked, and a part of the filtering membrane positioned right below the shunt part cannot contact the liquid medicine to form a filtering blank area, so that the filtering efficiency and the utilization rate of the filtering membrane are not facilitated; when theta is more than 20 degrees and less than 90 degrees, the flow dividing part can not obstruct the flow of the liquid medicine, the diffusion area of the liquid medicine flow can be greatly increased, the whole filtering membrane can be in contact with the liquid medicine, the liquid medicine is filtered, and the effective utilization rate and the filtering efficiency of the filtering membrane are improved.

Further, the flow dividing portion has an arc-shaped curved surface, and the arc-shaped curved surface is arranged towards the first passage.

Due to the design, because the arc-shaped curved surface has the largest surface area compared with other geometric shapes, the shunt part has the arc-shaped curved surface and can increase the contact area between the shunt part and the liquid medicine, so that the liquid medicine entering the first cavity can be dispersed through the shunt part, dead angles cannot exist, the whole shunt effect is best, and the resistance of the liquid medicine is smaller when the arc-shaped curved surface flows.

Furthermore, the shunting part is in contact with the inner surface of the side cover, and a first groove matched with the shunting part is formed in the contact position of the inner surface of the side cover and the shunting part.

The shunt part extends towards the side cover to contact with the inner surface of the side cover, and the inner surface of the side cover is provided with a first groove matched with the shunt part. So design, when main part and side cap cup jointed, reposition of redundant personnel portion and first recess can play prepositioning's effect for main part and side cap need not the alignment of visualing when cup jointing, the efficiency of the improvement production line that can be very big. And the structure can also enhance the assembly strength of the medical filter, and the side cover is not separated from the main body when the medical filter is stressed. Furthermore, when the medical filter is filled with the liquid medicine, the shunting part extending to the inner surface of the side cover can still shunt and diffuse the liquid medicine.

Further, be fixed with filtration membrane on the filtration membrane mounting bracket, form the second cavity, filtration membrane supports and leans on reposition of redundant personnel portion sets up.

So design, when filtration membrane fixed on the filtration membrane mounting bracket, the outstanding reposition of redundant personnel portion that sets up on the filtration membrane mounting bracket can play the effect of fixing in advance for fixed filtration membrane's operating procedure is simple and convenient, does not need the range estimation to aim at, the efficiency of the improvement production line that can be very big.

Further, the diversion cavity is provided with an arc-shaped side wall, and the arc-shaped side wall faces the filter membrane mounting frame.

So design, the liquid medicine that gets into medical filter from first passageway gets into first cavity through the buffering and the distribution in reposition of redundant personnel chamber earlier, and the reposition of redundant personnel chamber lateral wall towards the membrane mounting bracket is the guide liquid medicine that the arc structure can be fine and flows towards first cavity, and the resistance is minimum when the liquid medicine flows along the arc lateral wall moreover, can reduce the flow resistance of liquid medicine in reposition of redundant personnel chamber effectively. According to the stress concentration principle, the arc-shaped side wall can better avoid the phenomenon of stress concentration compared with the side walls with other shapes, and the strength of the medical filter is improved.

Further, the side cap internal surface is equipped with at least one second recess, the second recess sets up reposition of redundant personnel chamber below, and with the reposition of redundant personnel chamber faces mutually, the second recess has annular lateral wall surface and diapire, the diapire is provided with at least one bleeder vent, annular lateral wall surface be provided with the parallel annular platform face of diapire, be fixed with first waterproof ventilated membrane on the annular platform face, with the diapire of second recess forms the gas escape chamber, first waterproof ventilated membrane with the annular lateral wall surface of annular platform face top forms liquid and slows down the room.

And the side shell is provided with a second groove which forms a gas escape chamber and a liquid slow flow chamber together with the first waterproof breathable film. By the design, when the liquid medicine containing gas flows in the first cavity, the gas can escape from the liquid medicine to a high position due to the low density of the gas, and the gas escape chamber with the structure can effectively discharge the gas in the liquid medicine. And be equipped with liquid slow flow room between gas escape chamber and the first cavity, so design because the liquid medicine blocks up when the buffering of reposition of redundant personnel chamber with distribute the first cavity of entering easily, leads to the liquid medicine to flow slowly in reposition of redundant personnel chamber and first cavity department of meeting, has influenced filtration efficiency. The existence of the liquid slow flow chamber increases the flow cross-sectional area of the liquid medicine, so that the liquid medicine can enter the first cavity more smoothly. And because the flow area of the liquid medicine is increased, the flow speed of the liquid medicine when entering the first cavity can not be increased, thereby preventing the particles in the liquid medicine from scratching or excessively extruding the first waterproof breathable film.

Further, the side cover is provided with the second grooves at both ends near the first and second passages, respectively.

The side covers are provided with the grooves near the first and second channels, respectively. By the design, the liquid medicine entering the medical filter from the first passage can inevitably carry a large amount of gas, and the groove is arranged near the first chamber, so that the gas in the liquid medicine can be discharged as soon as possible. And in order to prevent the gas that does not arrange completely in the liquid medicine from getting into the second chamber, perhaps the gas that contains in the second chamber enters into the patient through the second passageway, causes medical negligence, consequently second passageway department also need set up the recess, further guarantees that the gas in the liquid medicine can be arranged completely.

Furthermore, two side surfaces of the filter membrane mounting rack are respectively provided with mounting surfaces, and the filter membranes are respectively fixed on the mounting surfaces to form the second chambers.

It will be appreciated that medical filters for medical fluids should have sufficient filter membrane area to ensure adequate flow. When the filtering aperture is smaller, the area of the filtering membrane needs to be increased to ensure enough flow, so that the appearance volume of the medical filter is too large, the medical filter is inconvenient for medical staff to use, and the large volume can cause liquid medicine waste. In the invention, the second chamber is provided with the double-layer filtering membrane, so that the membrane area of the medical filter can be ensured, and the flow of the liquid medicine is ensured.

Further, the side covers comprise two side covers with the same structure, and the two side covers, the main body and the filter membrane together form two first chambers.

The side cover comprises two side covers with the same structure, and two first cavities are formed. By the design, the volume of the medical filter can be increased under the condition that the size of the medical filter is unchanged or is slightly changed, and the flow of liquid medicine is ensured.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

Drawings

The invention will be further described with reference to the accompanying drawings in which:

FIG. 1 is a schematic view of a medical filter according to one embodiment of the present invention;

FIG. 2 is an exploded view of a filter for TCM according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a filter for TCM according to an embodiment of the present invention;

FIG. 4 is a partially enlarged schematic view of a Chinese medical filter according to an embodiment of the present invention;

FIG. 5 is a schematic view of a side cover according to an embodiment of the present invention;

FIG. 6 is a schematic view of a medical filter according to one embodiment of the present invention;

fig. 7 is a schematic diagram of an experimental method for testing the fouling capacity of the filter membrane in the first embodiment of the present invention.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein and, therefore, the scope of the present invention is not limited by the specific embodiments disclosed below.

The first embodiment is as follows:

fig. 1 is a schematic view of a medical filter 1 for medical use containing medical liquids according to the invention, and fig. 2 is an exploded view of the medical filter. In order to ensure the flow rate and the air permeability of the medical liquid and increase the capacity of the medical filter 1, the medical filter 1 comprises two side covers 2, a main body 3 and a filtering membrane 4 which have the same structure. The two ends of the main body 3 are respectively provided with a first channel 7 for the inflow of the liquid medicine and a second channel 8 for the outflow of the liquid medicine. The main body 3 is provided with a filter mounting rack 18 inside, and the shunt part 23 is arranged on the filter mounting rack 18 in a protruding manner. In the embodiment, in order to increase the filtering area, the two side surfaces of the filter mounting frame 18 respectively have mounting surfaces 19, the mounting surfaces 19 are respectively fixed with the filter membrane 4 to form the second chamber 6, the two side covers 2 and the main body 3 form the two first chambers 5, and the flow dividing chamber 12 between the filter mounting frame 18 and the outlet of the first channel 7. The distribution chamber 12 communicates with said first chamber 5, while the second passage 8 communicates with the second chamber 6. When the medical liquid enters the medical filter 1 from the first passage 7 and has a certain potential energy, in order to prevent the medical liquid from excessively extruding the filtering membrane 4, a shunting cavity 12 is arranged between the first cavity 5 and the first passage 7, and the medical liquid is buffered and distributed to uniformly enter the two first cavities 5. In order to bring more area of the filtration membrane 4 into contact with the chemical solution, the membrane mounting frame 18 is provided with a flow dividing portion 23. When the medical liquid passes through the filtering action of the filtering membrane 4 in the first chamber 5, the filter residue is remained in the first chamber 5, and the filtered medical liquid enters the second chamber 6 and flows out of the medical filter 1 through the second channel 8.

Specifically, in order to better disperse the liquid medicine in the first chamber 5 and ensure that the liquid medicine more smoothly enters the first chamber 5 from the flow dividing cavity 12, the flow dividing portion 23 is a semi-cylindrical shape having an arc-shaped curved surface, and the arc-shaped curved surface faces the first passage 7, so that the occurrence of a flowing dead angle is avoided. Meanwhile, the filtering membrane 4 is abutted against the shunting part 23 and fixed on the filtering membrane mounting frame 18, so that the shunting part 23 can be used as a pre-positioning structure of the filtering membrane 4, the operation steps of fixing the filtering membrane are simple and convenient, visual alignment is not needed, and the efficiency of the production line can be greatly improved. It should be understood by those skilled in the art that the shunt portion 23 is not limited to only a semi-cylindrical shape.

When the medical liquid entering the medical filter 1 from the first passage 7 fills the shunting cavity 12, the shunting cavity 12 can well guide the medical liquid to flow towards the first cavity 5 towards the arc-shaped side wall 26 of the filter membrane mounting frame 18, so that the flowing resistance of the medical liquid is reduced, and the stress concentration phenomenon can be avoided due to the arc-shaped structure, and the strength of the medical filter can be enhanced.

When the liquid medicine containing gas flows in the first chamber, because the gas density is lower, the gas can escape from the liquid medicine towards high position, and by utilizing the performance of the gas, as shown in the schematic diagram of the side cover in fig. 5, at least one second groove 13 is arranged on the inner surface of the side cover 2, the second groove 13 is provided with an annular side wall surface 15 and a bottom wall 17, the bottom wall 17 of the second groove 13 is provided with at least one vent hole 14 communicated with the external atmosphere, the annular side wall surface 15 is provided with an annular platform surface 16 parallel to the bottom wall 17, the first waterproof breathable film 9 is fixed on the annular platform surface 16, and the first waterproof breathable film and the bottom wall 17 form a gas escape chamber 10 together. The jam takes place easily when the buffering of liquid medicine through reposition of redundant personnel chamber gets into first cavity with the distribution, leads to the liquid medicine to flow slowly in reposition of redundant personnel chamber and first cavity department of meeting, has influenced filtration efficiency, consequently is equipped with liquid chamber 11 that slows down between gaseous effusion room and first cavity, so design because the existence of liquid chamber 11 that slows down makes the circulation cross-sectional area increase of liquid medicine, lets the liquid medicine more smoothly get into in first cavity 5. And because the flow area of the liquid medicine is increased, the flow speed of the liquid medicine when entering the first chamber 5 cannot be increased, thereby preventing the particles in the liquid medicine from scratching or excessively extruding the first waterproof breathable film 9. Further, in order to completely exhaust the gas in the chemical liquid, the two end portions of the side cover 2 are respectively provided with a second groove 13. In order to increase the assembly efficiency of the medical filter 1, the branches 23 extend towards the two side covers 2 until they contact the inner surfaces thereof, and the inner surfaces of the side covers 2 are correspondingly provided with first grooves 25 matching the branches 23. The shunt part 23 and the first recess 25 may serve as a pre-positioning for the assembly of the medical filter 1. Also, the shape of the flow dividing portion 23 is not limited to only that in the present embodiment.

In this embodiment, the flow rate and the filtration rate of the chemical solution can be increased without changing the volume of the filter or with a small change in the volume of the filter, and this can be achieved by increasing the filtration area. Thus, the filter mounting frame 18 has mounting surfaces 19 on both sides thereof, and the filter membrane 4 is fixed to the mounting surfaces 19 to form the second chamber 6. Of course, as shown in a cross-sectional view of a medical filter in fig. 6, the medical filter 21 has a first chamber and a second chamber formed by a side cover 2 and a main body 3, and in this case, the filter mounting frame is provided with only one mounting surface, the filter membrane 4 is fixed on the mounting surface, and the medical fluid in the second chamber is filtered by the single-side filter membrane. In order to prevent the filter membrane 4 from being deformed or even broken by the squeezing of the liquid medicine, either the double-sided filtration as shown in fig. 3 or the single-sided filtration as shown in fig. 6, at least one filter support rib 22 may be provided inside the filter mounting bracket 18 even when the filter membrane 4 is deformed against the filter support rib 22. Of course, those skilled in the art will appreciate that the shape, configuration, or number of the filter support ribs 22 can be adjusted to suit particular filtration needs.

In particular, in order to increase the efficiency of the filtering membrane 4, the flow-splitting section 23 is located on the central axis of said second chamber 6. The perpendicular distance of reposition of redundant personnel portion 23 and the center that first passageway 7 exported is recorded as H, and the width of reposition of redundant personnel portion 23 in the axis direction that is perpendicular to first passageway 7 is recorded as W, and the angle that the center that first passageway 7 exported and the width W of reposition of redundant personnel portion 23 included is theta, satisfies between H, W and theta: θ =2arctan (W/2H). In order to disperse the liquid medicine as much as possible when the liquid medicine enters the first chamber 5 so as to increase the utilization rate of the filtering membrane 4, the value range of theta is more than 20 degrees and less than 90 degrees.

In order to obtain the value range of the angle theta, the following experiment is performed by referring to the chemical industry standard HG/T2353-92 of the people's republic of China.

The experimental method and the steps are as follows:

(1) Two filter membranes with the same area S are taken, the mass M of the filter membrane is weighed by an electronic balance, the filter membrane with the mass M is selected as an experimental sample (a PES filter membrane with the diameter of 10um is selected), the classification method is as shown in FIG. 7, one end of the filter membrane abutting against the flow splitting part is divided into 10 areas with the same area by a marker pen, namely, the areas are S1, S2, S3, S4, S5, S6, S7, S8, S9 and S10 respectively, and then the masses of the 10 areas are ((M x (S1 + S2+ S3+ S4+ S5+ S6+ S7+ S8+ S9+ S10))/(10S)). The two filtration membranes are respectively installed in the medical filter in this embodiment.

(2) The test powder was added to distilled water to prepare a test solution containing 5g of the powder per liter of water.

(3) The test liquid enters the medical filter through the first channel at a rated flow rate, and the test is stopped after 1h (the test time can be adjusted according to actual conditions, but cannot be longer than the service life of the filter).

(4) The filtration membrane was removed from the medical filter and allowed to air dry under natural conditions.

(5) The 10 areas are cut off one by one along the mark of the marker by a pair of scissors, and the masses M1, M2, M3, M4, M5, M6, M7, M8, M9 and M10 are respectively weighed by an electronic balance.

(6) The fouling storage amount Yn = (((M × (S1 + S2+ S3+ S4+ S5+ S6+ S7+ S8+ S9+ S10))/(10S)) -Mn) of the above-mentioned 10 zone filtration membranes in milligrams

(7) The θ value was taken as a control group at 0 °, and the amount of stain received by the sample area was measured every 10 ° from 0 ° to 90 ° and the variance was calculated, as detailed in the following table one:

of course, the area of the sample region is not limited to be equally divided into 10 parts, and experimental tests can be performed according to the precision requirement. In this embodiment, the flow dividing portion 23 is located on the central axis of the second chamber 6, and therefore the two symmetrical sample areas have the same dirt holding amount theoretically with the central axis of the second chamber 6 as a symmetry line, and therefore, the dirt holding amount of one sample area only needs to be measured.

Variance reflects the average degree of dispersion of the variables. When theta =0 degrees, namely no shunt part exists in the medical filter, the data in the table shows that the variance of the pollutant carrying capacity of the sample area is large at the moment, which shows that only a small area of the filtering membrane close to the shunt cavity can be contacted with the liquid medicine, and when the liquid medicine enters the first chamber from the shunt cavity, the liquid medicine tends to be concentrated into a strand of liquid flowing along the filtering membrane, so that the filtering efficiency and the filtering effect are greatly influenced; when theta is larger than 0 degree and smaller than or equal to 20 degrees, the variance of the pollutant carrying capacity of the sample area is far larger than that of the sample area provided with other shunting parts, which shows that when theta is larger than 0 degree and smaller than or equal to 20 degrees, when the liquid medicine enters the first chamber from the shunting cavity, the shunting parts have small dispersion effect on the liquid medicine, so that the filtering membrane can not be fully utilized, and at the moment, the shunting parts have no effective influence on the improvement of the utilization rate of the filtering membrane; when theta is more than 20 degrees and less than 90 degrees, the variance floating range of the pollutant carrying capacity of the sample area is very small, which shows that the flow dividing part can effectively disperse and expand the flow of the liquid medicine, the contact area of the liquid medicine and the filtering membrane is increased, and the utilization rate of the filtering membrane is improved; but when theta is more than or equal to 90 degrees, the variance of the pollutant carrying capacity of the sample area increases suddenly, which indicates that the existence of the shunt part hinders the contact between the liquid medicine and the filtering membrane of the sample area, because the volume occupied by the shunt part in the shunt cavity is too large, the shunt part prevents the contact between the liquid medicine and the filtering membrane of the sample area, and the shunt part at the moment can also cause the blockage and detention of the liquid medicine in the shunt cavity, which is not beneficial to improving the utilization rate and the efficiency of the filtering membrane.

Those skilled in the art will appreciate that the position of the flow dividing portion 23 is not limited to only the position in the present embodiment. When the position of the flow dividing part 23 is changed, the influence of the flow dividing part 23 on the utilization rate of the filter membrane 4 can be tested by using the above test principle, but the statistical calculation method of the dirt holding amount of the sample area at this time is changed according to specific situations. Whether the medical filter is the double-sided filtration as shown in fig. 3 or the single-sided filtration as shown in fig. 6, the above method can be used for testing to obtain the range of the included angle θ between the flow dividing part 23 and the center of the outlet of the first channel 7.

While the preferred embodiments of the present invention have been illustrated and described in detail, it should be understood that various changes and modifications of the invention can be effected therein by those skilled in the art after reading the above teachings of the invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims

1. The utility model provides a medical filter, includes main part and side cover, form the inner chamber between main part and the side cover, the inner chamber includes first cavity and second cavity, first cavity by side cover, main part and filtration membrane are injectd, the second cavity by main part and filtration membrane are injectd, the both ends of main part are equipped with the first passageway that supplies the fluid inflow and the second passageway that supplies the fluid outflow respectively, its characterized in that: a filter membrane mounting frame is arranged inside the main body, a shunt cavity is arranged between the filter membrane mounting frame and the outlet of the first channel, a shunt part is arranged in the shunt cavity and is positioned on the central axis of the second cavity, the shunt part and the outlet of the first channel are arranged in an aligned mode, the shunt part is fixed on the filter membrane mounting frame and protrudes towards the side cover relative to the filter membrane mounting frame, the shunt cavity is communicated with the first cavity, and the second channel is communicated with the second cavity;

the perpendicular distance between the flow dividing part and the center of the first channel outlet is recorded as H, the width of the flow dividing part in the direction perpendicular to the central axis of the first channel is recorded as W, the included angle between the center of the first channel outlet and the width W of the flow dividing part is recorded as theta, and the H, the W and the theta satisfy the following conditions: θ =2arctan (W/2H), wherein θ has a value range of: theta is more than 20 degrees and less than 90 degrees.

2. The medical filter according to claim 1, wherein the flow dividing portion has a curved surface of a circular arc shape disposed toward the first passage.

3. The medical filter of claim 1, wherein the shunt portion is in contact with an inner surface of the side cover, the inner surface of the side cover being provided with a mating first groove at the contact with the shunt portion.

4. The medical filter of claim 1, wherein a filter membrane is secured to the filter membrane mounting bracket forming a second chamber, the filter membrane being disposed against the diverter portion.

5. The medical filter of claim 1, wherein the distribution chamber has an arcuate sidewall disposed toward the filter mounting bracket.

6. The medical filter according to claim 1, wherein the inner surface of the side cover is provided with at least one second groove, the second groove is disposed below the distribution chamber and adjacent to the distribution chamber, the second groove has an annular side wall surface and a bottom wall, the bottom wall is provided with at least one vent hole, the annular side wall surface is provided with an annular terrace surface parallel to the bottom wall, a first waterproof breathable film is fixed on the annular terrace surface, a gas escape chamber is formed with the bottom wall of the second groove, and the first waterproof breathable film and the annular side wall surface above the annular terrace surface form a liquid slow flow chamber.

7. The medical filter of claim 6, wherein the side cover is provided with the second grooves proximate both ends of the first and second channels, respectively.

8. The medical filter as set forth in claim 1, wherein said filter membrane mounting bracket has mounting surfaces on both sides thereof, respectively, said mounting surfaces having said filter membrane secured thereto, respectively, to form said second chamber.

9. The medical filter of claim 8, wherein the side cover comprises two side covers of identical construction that together with the main body and filter membrane form the two first chambers.