Microclot filter

Abstract

The utility model discloses a microclot filter which comprises a shell assembly, a filter element, a filter element, a filter element, a filter element, a filter element, a filter element, a filter element, a filter element, a filter element and a filter element, and is characterized in that the shell assembly is provided with an upper shell and a lower shell; the filter material assembly is provided with a filter membrane which is continuously folded, the filter membrane is peripherally and thermally sealed in the upper shell or the lower shell to form sealed connection, and the filter cavity is divided into a pre-filter cavity and a post-filter cavity. Through the design of the filter membrane which is continuously folded, the effective filtering area is increased to more than 40 times of that of a traditional structure, large-volume blood can be treated, and blockage is not prone to occurring; by means of the sealing connection structure, the bypass leakage risk is eliminated, 20-160-micrometer microclots are accurately intercepted, and especially the filtering efficiency of 40-60-micrometer medium-sized clots is remarkably improved. In addition, the gradient filtering composite membrane is adopted, the single-layer load is reduced in the whole process, the filtering efficiency is improved, and meanwhile the service life of the filtering membrane is prolonged by more than two times.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, concretely relates to a microclot filter. BACKGROUND

[0002] In the blood storage process, red blood cells, platelet fragments and other components can form microclot of 20-160 mu m. The traditional blood filter generally adopts the filtering structure of single layer filter membrane or multiple layer filter membrane layering, and is limited by the shape of the filter housing, so the effective filtering area is usually less than 1000 mm², therefore, in the blood filtering process, there are defects such as low processing capacity, easy to be blocked and gradually reduced filtering efficiency, and the microclot in the blood cannot be effectively treated.

[0003] In addition, clinical research shows that the microaggregate formed in the stored blood has the characteristics of multi-particle size distribution, and the proportion of medium-sized microclot of 40-60 mu m is as high as the maximum, and the existing single gradient filter membrane lacks pertinence, the filtering effect is poor, and the filtering efficiency is also relatively low. SUMMARY

[0004] In order to efficiently filter the microclot in the blood, the utility model provides a microclot filter.

[0005] The technical scheme adopted by the utility model is as follows: a microclot filter, comprising a shell assembly and a filter material assembly; the shell assembly has an upper shell and a lower shell, the upper shell is provided with a liquid inlet pipe at the top, the lower shell is provided with a liquid outlet pipe at the bottom, and a filter cavity is formed between the upper shell and the lower shell; the filter material assembly has a continuously folded filter membrane, the filter membrane is heat sealed in the upper shell or the lower shell in the circumferential direction and forms a sealed connection, and the filter cavity is isolated into a pre-filtering cavity and a post-filtering cavity.

[0006] Preferably, the shell assembly and the filter material assembly are quadrangular; the filter membrane is reciprocally folded through a plane to form an overall organ-like shape, and the filter material assembly further comprises side baffles heat sealed on the left and right sides of the filter membrane.

[0007] Preferably, the shell assembly and the filter material assembly are circular; the filter membrane adopts a radial star-shaped folding mode and radiates and expands outward from the center to form an overall cylindrical shape, and the filter material assembly further comprises an upper baffle heat sealed on the top of the filter membrane.

[0008] Preferably, the filter membrane has 20-50 folding units.

[0009] Preferably, the unfolded area of the filter membrane is greater than or equal to 40000 mm².

[0010] Preferably, the filter membrane is a gradient filter composite membrane, and the filter pore size gradually decreases along the blood flow direction.

[0011] Preferably, the filter membrane is a multi-layer structure, and the support layer, the first filter layer, the second filter layer and the third filter layer are arranged in sequence along the blood flow direction; the pore size of the support layer is 500-1000 microns, the pore size of the first filter layer is 60±5 microns, the pore size of the second filter layer is 40±5 microns, and the pore size of the third filter layer is 23±5 microns; the support layer, the first filter layer, the second filter layer and the third filter layer are connected with the shell assembly after being heat sealed at the periphery.

[0012] Preferably, the material of the support layer is polypropylene non-woven fabric, and the first filter layer, the second filter layer and the third filter layer are polycarbonate membranes.

[0013] Preferably, the liquid inlet adopts a luer interface, and the liquid outlet adopts a plastic needle type interface.

[0014] Preferably, the upper shell and the lower shell are injection molded by using medical grade polycarbonate or polypropylene, and the surface roughness Ra is less than or equal to 0.8 microns.

[0015] The utility model has the following beneficial effects:

[0016] 1. The continuous folding filter membrane effectively increases the filtering area to more than 40 times of the traditional structure, can process larger capacity of blood and is not easy to be blocked; the sealed connection ensures that there is no bypass leakage in the filtering path, and the 20-160 microns microclot is intercepted in a targeted manner, and the filtering efficiency of the 40-60 microns medium-sized clot is significantly improved;

[0017] 2. The gradient designed filter membrane realizes graded filtering, the support layer performs coarse filtering, the first filter layer intercepts the large clots in the blood larger than 55 microns, the second filter layer captures the particles of 35-55 microns, and the third filter layer removes the fragments of 18-28 microns, the single layer load in the whole process is reduced, the filtering efficiency is improved, and the service life of the filter membrane is prolonged by more than 2 times. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic view of the first embodiment of the utility model.

[0019] Figure 2 It is an installation schematic view of the first embodiment of the utility model.

[0020] Figure 3 It is an enlarged schematic view of A in the first embodiment of the utility model.

[0021] Figure 4 It is a structural schematic view of the filter membrane in the first embodiment of the utility model.

[0022] Figure 5 It is a schematic view of the second embodiment of the utility model.

[0023] Figure 6 This is an installation diagram of the second embodiment of the present invention.

[0024] Figure 7 This is an enlarged schematic diagram of point B in the second embodiment of this utility model.

[0025] Housing assembly 1, upper housing 101, lower housing 102, liquid inlet 103, liquid outlet 104;

[0026] Filter media assembly 2, filter membrane 201, side baffle 202, top baffle 203, support layer 204, first filter layer 205, second filter layer 206, third filter layer 207. Detailed Implementation

[0027] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0028] In Example 1, as Figures 1-3 The image shows a microcluster filter, comprising: a housing assembly 1 having an upper housing 101 and a lower housing 102, with an inlet 103 at the top of the upper housing 101 and an outlet 104 at the bottom of the lower housing 102, forming a filtration chamber between the upper and lower housings; and a filter media assembly 2 having a continuously folded filter membrane 201, which is circumferentially heat-sealed within the upper or lower housing to form a sealed connection, isolating the filtration chamber into a pre-filtration chamber and a post-filtration chamber. This embodiment, through its continuously folded filter membrane design, increases the effective filtration area to more than 40 times that of traditional structures, enabling the processing of larger volumes of blood without clogging; the sealed connection ensures no bypass leakage along the filtration path, specifically intercepting microclusters of 20-160μm, with a particularly significant improvement in filtration efficiency for medium-sized clusters of 40-60μm.

[0029] In Example 1, as Figures 1-3 As shown, the housing assembly 1 and the filter media assembly 2 are quadrilaterals; the filter membrane 201 is folded back and forth in a plane to form an overall accordion-like shape. The filter media assembly 2 also includes side baffles 202 heat-sealed to the left and right sides of the filter membrane 201. In this form, the blood flow direction is from top to bottom. The square structure combined with the accordion-like folding can achieve the maximum effective area in a compact layout, reducing the overall size of the filter. The side baffles 202 prevent leakage at the edges of the filter membrane and enhance structural stability. They can be made of polyethylene or polyethersulfone.

[0030] In Example 1, as Figures 1-3As shown, the filter membrane 201 has 20-50 folding units. This folding density design balances the filtering area and structural strength, with 20 units achieving an unfolded area of about 20000mm2, and 50 units reaching more than 50000mm2, meeting the capacity requirements of different clinical scenarios, while avoiding the risk of membrane structure damage caused by excessive folding. Generally, the unfolded area of the filter membrane 201 is selected to be more than 40000mm2, and the large unfolded area increases the single filtering processing capacity to 5-8 times that of traditional filters, which is particularly suitable for large-flow scenarios such as intraoperative autologous blood transfusion, significantly reducing the replacement frequency of the filter and ensuring the continuity of the operation.

[0031] In Example One, as shown in Figure 4 The filter membrane 201 is a gradient filtration composite membrane, and the filter pore size gradually decreases along the blood flow direction. Specifically, the filter membrane 201 has a multi-layer structure, including a support layer 204, a first filter layer 205, a second filter layer 206, and a third filter layer 207 along the blood flow direction. The pore size of the support layer 204 is 500-1000μm, the pore size of the first filter layer 205 is 60±5μm, the pore size of the second filter layer is 40±5μm, and the pore size of the third filter layer is 23±5μm. The material of the support layer 204 is polypropylene non-woven fabric, and the first filter layer 205, the second filter layer 206, and the third filter layer 207 are polycarbonate membranes. The support layer 204, the first filter layer 205, the second filter layer 206, and the third filter layer 207 are connected to the shell assembly 1 after being heat sealed around the periphery. The support layer 204 makes the filter membrane 201 have sufficient stiffness to facilitate the shaping of the filter membrane 201 into a continuous folding type, and the support layer 204 also plays a role in rough filtration. The first filter layer 205, the second filter layer 206, and the third filter layer 207 form a three-layer gradient filtration, first intercepting large particles, then gradually filtering medium and small particles, achieving fractional filtration: the first filter layer 205 intercepts large clots in the blood of >55μm, the second filter layer 206 captures particles of 35-55μm, and the third filter layer 207 removes debris of 18-28μm, reducing the load on the single layer throughout the process, protecting the downstream filter layer, improving the filtration efficiency, and extending the service life of the filter membrane by more than 2 times.

[0032] In Example One, as shown in Figures 1-3 The liquid inlet 103 adopts a luer interface, and the liquid outlet 104 adopts a plastic needle type interface. The standardized interface design ensures quick and reliable connection with medical devices such as blood transfusion devices, blood bags, etc., the locking structure of the luer interface prevents accidental falling during operation, and the plastic needle type interface can directly pierce the blood bag port, improving the efficiency of clinical operation.

[0033] In Example 1, the upper shell 101 and the lower shell 102 are injection molded from medical-grade polycarbonate or polypropylene, with a surface roughness Ra≤0.8μm. Medical-grade materials meet biocompatibility requirements, and the smooth surface reduces the adhesion of blood components, while also facilitating sterilization and manufacturing.

[0034] In Example 2, as Figures 5-7 As shown, another type of microcluster filter has a circular housing assembly 1 and filter media assembly 2. The filter membrane 201 adopts a radial star-shaped folding pattern, radiating outward from the center to form an overall cylindrical shape. The filter media assembly 2 also includes an upper baffle 203 heat-sealed to the top of the filter membrane 201. In this form, the blood flow direction is from the periphery to the center. The circular structure is adapted to the hydrodynamic characteristics of conventional blood bag systems, and the star-shaped folding makes the liquid distribution more uniform. The upper baffle 203 can prevent blood from bypassing and leaking in the filtration path, ensuring the reliability of filtration throughout the entire area.

[0035] Obviously, the above embodiments of this utility model are merely examples for illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Other obvious variations or modifications derived from the essential spirit of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A micro clot filter, characterized in that, The application relates to a filter device, which comprises: a shell assembly (1) with an upper shell (101) and a lower shell (102), the upper shell (101) being provided with an inlet pipe (103) at the top, the lower shell (102) being provided with an outlet pipe (104) at the bottom, and a filter cavity being formed between the upper shell (101) and the lower shell (102); a filter material assembly (2) with a continuously folded filter membrane (201), the filter membrane (201) being circumferentially heat sealed in the upper shell (101) or the lower shell (102) and forming a sealed connection to separate the filter cavity into a pre-filtering cavity and a post-filtering cavity.

2. The micro clot filter of claim 1, wherein, The shell assembly (1) and the filter material assembly (2) are quadrangular; the filter membrane (201) is folded back and forth in a plane to form an overall organ-like shape; and the filter material assembly (2) further comprises side baffles (202) heat sealed on the left and right sides of the filter membrane (201).

3. The micro clot filter of claim 1, wherein, The shell assembly (1) and the filter material assembly (2) are circular; the filter membrane (201) is folded in a radial star-shaped mode to radiate and expand from the center to form an overall cylindrical shape; and the filter material assembly (2) further comprises an upper baffle (203) heat sealed on the top of the filter membrane (201).

4. The microemboli filter of claim 2 or 3, wherein, The filter membrane (201) has 20-50 folding units.

5. The microemboli filter of claim 2 or 3, wherein, The unfolded area of the filter membrane (201) is greater than or equal to 40000 mm2.

6. The micro clot filter of claim 1, wherein, The filter membrane (201) is a gradient filtering composite membrane, and the filtering pore size gradually decreases along the blood flow direction.

7. The microemboli filter of claim 6 wherein, The filter membrane (201) has a multi-layer structure, and along the blood flow direction, the filter membrane (201) comprises a support layer (204), a first filtering layer (205), a second filtering layer (206) and a third filtering layer (207) in sequence, the pore size of the support layer (204) is 500-1000 mu m, the pore size of the first filtering layer (205) is 60+ / -5 mu m, the pore size of the second filtering layer (206) is 40+ / -5 mu m, and the pore size of the third filtering layer (207) is 23+ / -5 mu m; and the periphery of the support layer (204), the first filtering layer (205), the second filtering layer (206) and the third filtering layer (207) is heat sealed and connected with the shell assembly (1).

8. The microemboli filter of claim 7 wherein, The material of the support layer (204) is polypropylene non-woven fabric, and the first filtering layer (205), the second filtering layer (206) and the third filtering layer (207) are polycarbonate membranes.

9. The micro clot filter of claim 1, wherein, The inlet pipe (103) adopts a luer interface, and the outlet pipe (104) adopts a plastic needle type interface.

10. The micro clot filter of claim 1, wherein, The upper shell (101) and the lower shell (102) are formed by medical grade polycarbonate or polypropylene injection molding, and the surface roughness Ra is less than or equal to 0.8 mu m.

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