A new blood reservoir filter

Abstract

The application discloses a novel blood storage device filter element and belongs to the field of medical devices, which comprises a framework, a filter screen and a sponge, the inner side of the framework is provided with a clamping groove; the filter screen and the framework form an integrated structure; one end of the sponge is inserted into the clamping groove, and the outer side surface of the sponge is attached to the inner side surface of the framework. The filter screen and the framework are integrally formed, effectively avoiding the problem of invalid filtering area caused by the traditional sewing process, and significantly improving the effective filtering area. Meanwhile, the sponge and the framework are inserted and matched through the clamping groove, ensuring the close attachment between the two, eliminating the blood flow phenomenon, and improving the filtering efficiency. In addition, the structure simplifies the assembly process, reduces the process steps, reduces the production cost, and improves the product yield and reliability.

Description

Technical Field

[0001] This application relates to the technical field of autologous fluid recovery containers in medical devices, and in particular to a novel blood storage filter element. Background Technology

[0002] A blood reservoir is a medical device designed to temporarily store blood during medical procedures. These devices are components of systems such as cardiopulmonary bypass (CPB) and autologous blood transfusion. The primary function of a blood reservoir is to collect blood flowing from the surgical area during surgery (e.g., cardiac aspiration) or to temporarily drain blood from the patient's circulation during procedures such as CPB. Another important function of a blood reservoir is to capture and remove air bubbles (defoaming) and particulate matter (filtration) from the collected blood before it is returned to the patient. A blood reservoir filter is defined as a component located inside or connected to the blood reservoir specifically designed to remove particulate matter, air bubbles, and other contaminants from the blood.

[0003] In related technologies, patent CN202146473U discloses a blood storage and filtration device, comprising: a matching upper cover and a cylinder; the upper cover has a blood collection port, a pressure balancing port, a medication injection port, and a negative pressure inlet; the bottom of the cylinder has a bleeding port; the inner cavity of the cylinder has a primary filtration device; and the bottom of the inner cavity of the cylinder also has a secondary filtration device, located below the primary filtration device and above the bleeding port. This invention can filter out blood clots and flocculent matter generated during autologous blood recovery in clinical surgery, thereby ensuring the safety of autologous blood reinfusion, effectively reducing the cost of filtering blood clots and flocculent matter, and significantly improving economic efficiency.

[0004] At the same time, refer to Figure 1 In related technologies, a blood storage filter element adopts a layered assembly structure. A cylindrical skeleton 10 with supporting ribs is formed by injection molding of ABS material. A polyurethane perforated sponge 11 is wrapped around the outer surface of the cylindrical skeleton 10, and finally a nylon woven filter screen is fitted on it and fixed with sewing thread.

[0005] The aforementioned technology has the following problems: 1) The three-layer structure of skeleton, sponge, and filter requires strict tolerance, resulting in a low assembly yield. 2) Insufficient interlayer adhesion of the three-layer structure leads to blood bypass, reducing filtration efficiency by approximately 30%. 3) There is an ineffective filtration area of ​​approximately 2-3 mm at the filter suture interface, resulting in a loss of 15-20% of the effective filtration area. 4) The risk of suture breakage leads to filter detachment (clinical incidence rate of approximately 0.3%). Utility Model Content

[0006] To address issues such as large ineffective filtration areas, insufficient interlayer adhesion, and cumbersome manufacturing processes, this application provides a novel blood storage filter element.

[0007] The novel blood storage filter element provided in this application adopts the following technical solution: A novel blood collection filter element includes: A frame, wherein a snap-fit ​​groove is provided on the inner side of the frame; The filter screen and the frame form an integral structure; A sponge, one end of which is inserted into the snap-fit ​​groove, and the outer surface of the sponge is in contact with the inner surface of the skeleton.

[0008] By adopting the above technical solution, an integrated molding design of the filter and frame is achieved, effectively avoiding the problem of ineffective filtration areas caused by traditional sewing processes and significantly increasing the effective filtration area. Simultaneously, the sponge and frame are joined by interlocking grooves, ensuring a tight fit and eliminating blood circumference, thus improving filtration efficiency. Furthermore, this structure simplifies the assembly process, reduces process steps, lowers production costs, and improves product yield and reliability.

[0009] Optionally, the frame includes a chassis and a frame body, the frame body surrounds and connects to the peripheral side of the chassis, the snap-fit ​​groove is provided on the chassis, the snap-fit ​​groove includes a first inner side and a second inner side disposed opposite to each other, the first inner side is closer to the center of the chassis than the second inner side, and the second inner side and the inner side of the frame body are located on the same plane.

[0010] By adopting the above technical solution, an optimized design of the skeleton structure was achieved. This structural design enhances overall stability and provides reliable support for the installation of subsequent components. This design ensures precise positioning and secure fixation during sponge insertion, avoiding the problem of insufficient interlayer adhesion in traditional processes, thereby effectively preventing blood circumference and improving filtration efficiency. Improvements to the skeleton structure simplify the assembly process, increase production efficiency, and reduce assembly defect rates, laying the foundation for integrated product molding.

[0011] Optionally, the chassis includes a central disc and an edge disc connected together, the snap-fit ​​groove is disposed between the central disc and the edge disc, the frame is fixed to the edge disc, and the height of the central disc is higher than the height of the edge disc.

[0012] By adopting the above technical solution, the structural design of the central and edge discs allows for precise positioning of the snap-fit ​​grooves, improving the stability of the sponge insertion. The design of the central disc being higher than the edge discs increases the structural strength of the chassis and provides a reasonable spatial layout for the snap-fit ​​grooves, ensuring a full fit between the sponge and the inner surface of the frame, effectively preventing blood circumference and improving filtration efficiency. Furthermore, this design facilitates the flow of blood out of the frame gaps after passing through the sponge, making blood circulation smoother.

[0013] Optionally, the height of the central disk gradually decreases from the center to the peripheral side.

[0014] By adopting the above technical solutions, blood flow is made smoother, thereby reducing blood bypassing and further improving filtration efficiency.

[0015] Optionally, a weight-reducing groove is provided on the bottom side of the chassis.

[0016] By adopting the above technical solution, the weight-reducing tank effectively reduces the weight of the chassis, thereby reducing the amount of material used in the entire blood collection filter element and lowering manufacturing costs. At the same time, the weight-reducing tank design achieves lightweighting while maintaining structural strength, which helps improve the assembly efficiency of the filter element and reduces the impact on the overall weight of the blood recovery system.

[0017] Optionally, the distance between the first inner side and the second inner side is equal, or the distance between the first inner side and the second inner side gradually decreases from the bottom of the snap-fit ​​groove to the opening of the snap-fit ​​groove.

[0018] By adopting the above technical solution, the distance between the first and second inner sides of the snap-fit ​​groove is designed to be equal or gradually decrease from the bottom to the opening of the groove, ensuring that the sponge is subjected to uniform force or forms a tight fit during insertion. This design effectively avoids blood flow problems caused by insufficient interlayer adhesion, thereby improving filtration efficiency. At the same time, the tight fit helps to further lock the sponge in place.

[0019] Optionally, the skeleton is a cylindrical skeleton or a frustum-shaped skeleton.

[0020] By adopting the above technical solutions, the filter element's skeleton is designed in a cylindrical or frustum shape, making the overall structure of the filter element more stable and better adaptable to the internal space of blood collection devices of different shapes. This design optimizes the blood flow path, reduces blood retention in the filter element's edge area, and improves filtration efficiency. Furthermore, the cylindrical or frustum shape simplifies production and assembly processes, reduces manufacturing costs, and enhances the product's market competitiveness.

[0021] Optionally, the filter screen is disposed on the outer side of the skeleton or on the inner side of the skeleton frame.

[0022] By adopting the above technical solution, the filter screen can be flexibly placed on the outer side or the inner side of the frame according to actual needs, thereby optimizing the filtration path. This design can effectively adapt to different filtration scenarios and requirements, improving the overall applicability of the filter element. Specifically, placing the filter screen on the outer side of the frame increases the effective filtration area of ​​the filter element and improves filtration efficiency; while placing the filter screen on the inner side of the frame reduces the direct impact of external impurities on the filter screen and extends its service life.

[0023] Optionally, the filter screen is ultrasonically welded to form an integral structure with the frame.

[0024] By adopting the above technical solution, the filter and the frame form an integrated structure, effectively avoiding the filter detachment problem that may occur in traditional sewing processes. It also eliminates ineffective filtration areas at the sewing joint, significantly increasing the effective filtration area and improving filtration efficiency. Specifically, the application of ultrasonic welding technology ensures a tight fit between the filter and the frame, reducing blood flow around the filter and further improving the stability and reliability of the filtration effect. Furthermore, this solution simplifies the manufacturing process, reduces production costs, and improves the overall product yield.

[0025] Optionally, the outer surface of the skeleton is an arc surface.

[0026] By adopting the above technical solution, the outer surface of the filter element is designed as a rounded surface, which can effectively reduce eddies and stagnation during blood flow, thereby reducing the risk of damage to blood components and improving filtration efficiency. At the same time, the rounded surface design helps to optimize the overall structural stability of the filter element, making the integral molding of the filter screen and the filter element fit better, further improving the interlayer adhesion and avoiding blood circumference problems.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. By integrating the filter and frame into one piece, the ineffective filtration area in traditional stitching processes is eliminated, effectively increasing the filtration area by approximately 15-20% and significantly improving blood filtration efficiency; 2. The sponge and the skeleton are tightly fitted together through snap-fit ​​grooves. The sponge is placed inside the skeleton. When pushed by blood, the sponge and the skeleton fit together more tightly, avoiding the problem of insufficient interlayer adhesion, reducing blood circumference, and improving filtration efficiency by about 30%. 3. The use of ultrasonic welding to replace the traditional sewing process not only eliminates the risk of filter screen falling off due to broken sewing threads, but also simplifies the manufacturing process, reducing it from the original 5 steps to 3 steps, which greatly improves production efficiency and reduces costs. Attached Figure Description

[0028] Figure 1 This is an exploded structural diagram of a blood storage filter element in related technologies.

[0029] Figure 2 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0030] Figure 3 This is an exploded view of the overall structure of Embodiment 1 of this application.

[0031] Figure 4This is a cross-sectional view of the overall structure of Embodiment 1 of this application.

[0032] Figure 5 This is a cross-sectional view of the overall structure of Embodiment 2 of this application.

[0033] Explanation of reference numerals in the attached figures: 10. Cylindrical frame; 11. Perforated sponge; 20. Frame; 21. Snap-fit ​​groove; 211. First inner side; 212. Second inner side; 22. Chassis; 221. Central disc; 222. Edge disc; 23. Frame; 24. Weight reduction groove; 30. Sponge. Detailed Implementation

[0034] The following will be combined with the appendix Figure 1-5 The technical solutions in the embodiments of this utility model are clearly and completely described herein. The described embodiments are only possible technical implementations of this utility model and not all possible implementations. Those skilled in the art can obtain other embodiments in conjunction with the embodiments of this utility model without creative effort, and these embodiments are also within the protection scope of this utility model.

[0035] To address the problems of low assembly yield, loss of effective filtration area, decreased filtration efficiency, and filter screen detachment in the layered assembly structure of blood collection system filters in existing technologies, this application mainly adopts the following solution, which achieves the effect of significantly improving filtration efficiency, reducing ineffective filtration areas, and improving product reliability by optimizing structural design and manufacturing process.

[0036] Example 1 This application provides a novel blood storage filter element, referring to... Figure 2 and Figure 3 The system includes a frame 20, a filter screen (not shown in the figure), and a sponge 30. The frame 20 has a snap-fit ​​groove 21 on its inner side, and the filter screen and the frame 20 form an integral structure. One end of the sponge 30 is inserted into the snap-fit ​​groove 21, and the outer side of the sponge 30 is attached to the inner side of the frame 20, which significantly improves the filtration efficiency and assembly yield.

[0037] Specifically, refer to Figure 3 and Figure 4The frame 20 includes a base 22 and a frame 23. The base 22 encloses the lower end of the frame 20, and the frame 23 surrounds and connects to the peripheral side of the base 22. Preferably, the base 22 includes an integrally formed and connected central disc 221 and edge discs 222. A snap-fit ​​groove 21 is formed between the central disc 221 and the edge discs 222. The snap-fit ​​groove 21 includes a first inner surface 211 and a second inner surface 212 disposed opposite to each other. The first inner surface 211 is closer to the center of the base 22 than the second inner surface 212, while the second inner surface 212 is located on the same plane as the inner surface of the frame 23. This structural design ensures that the sponge 30 can be stably inserted into the snap-fit ​​groove 21, while ensuring good fit between the sponge 30 and the inner surface of the frame 20, thereby improving the filtration efficiency.

[0038] In a preferred embodiment, the height of the central disc 221 is higher than the height of the edge discs 222, and the height of the central disc 221 gradually decreases from the center to the peripheral side. This height difference design effectively guides blood flow and reduces the possibility of blood bypassing.

[0039] Furthermore, a weight-reducing groove 24 is provided on the bottom side of the chassis 22, which reduces the overall weight without sacrificing structural strength, thus helping to reduce production costs. In other embodiments, reinforcing ribs can be added inside the weight-reducing groove 24. The reinforcing ribs can be arranged in a cross shape or a grid pattern. This design improves structural strength while reducing weight, and is particularly suitable for applications that need to withstand high pressure, such as in the process of filtering high-viscosity blood. It can effectively prevent the skeleton 20 from deforming, thereby ensuring the stability of the filtration effect.

[0040] Optionally, the distance between the first inner surface 211 and the second inner surface 212 can be equal, or it can gradually decrease from the bottom of the snap-fit ​​groove 21 to the opening of the snap-fit ​​groove 21. This design can be flexibly adjusted according to actual needs to adapt to the usage requirements under different working conditions. For example, when the distance is equal, the sponge 30 is easier and faster to insert; while when the distance gradually decreases, the tightness of the insertion can be further improved to prevent loosening.

[0041] Optionally, the skeleton 20 can be cylindrical or frustum-shaped. The choice between these two shapes depends on the actual application environment and requirements. For example, a cylindrical shape is suitable for situations with high symmetry, while a frustum-shaped shape is suitable for scenarios that require guiding blood flow. In addition, the outer surface of the skeleton 20 can be a curved surface, which helps to reduce blood flow resistance and improve filtration efficiency.

[0042] Furthermore, the filter screen can be located on the outer side of the frame 20 or on the inner side of the frame 20. The filter screen is ultrasonically welded to the frame 20 to form an integral structure. This process not only avoids ineffective filtration areas caused by traditional sewing processes but also improves the fixing reliability of the filter screen. For example, ultrasonic welding can form a strong connection between the filter screen and the frame 20, avoiding the risk of stitching breakage.

[0043] Optionally, the filter material can be polypropylene fiber or polyester fiber. Both materials have good filtration performance and corrosion resistance, effectively removing impurities from the blood. Furthermore, the pore size of the filter can be adjusted according to actual needs, typically ranging from 50 to 200 micrometers, to meet different filtration precision requirements.

[0044] The material for Sponge 30 can be either polyurethane foam or polyethylene foam. Both materials have good elasticity and adsorption properties, effectively adsorbing tiny particles in the blood. For example, the open-cell structure of polyurethane foam can increase the filtration area and improve filtration efficiency; while polyethylene foam has better durability and is suitable for long-term use.

[0045] The implementation principle of this embodiment is as follows: By optimizing the structural design of the frame 20, an ultrasonic welding process is used to form an integral structure between the filter screen and the frame 20, and the snap-fit ​​groove 21 is used to achieve stable insertion of the sponge 30. This structural design significantly improves the interlayer adhesion, reduces ineffective filtration areas, and thus improves filtration efficiency. At the same time, it simplifies the production process, reduces production costs, and improves the reliability and safety of the product, effectively improving upon existing technologies.

[0046] Example 2 The difference between this embodiment and Embodiment 1 is that, referring to... Figure 5 The frame 20 is designed in the shape of a frustum, and the filter screen is located inside the frame of the frame 20. This design is particularly suitable for scenarios that require guiding blood flow, such as under high flow rate conditions. The frustum-shaped frame 20 can effectively disperse blood flow pressure and reduce the impact of blood impact on the filter screen, thereby further improving filtration efficiency and service life.

[0047] The implementation principle of this embodiment is as follows: by adopting a frustum-shaped frame 20 and an inner filter layout, combined with ultrasonic welding technology, this structural design not only retains the original advantages, but also further enhances the ability to guide blood flow, improves the adaptability and durability of the product, and further optimizes the existing technology.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A novel blood reservoir filter element, characterized in that, include: The frame (20) has a snap-fit ​​groove (21) on its inner side; The filter screen and the frame (20) form an integral structure; Sponge (30), one end of which is inserted into the snap-fit ​​groove (21), and the outer side of the sponge (30) is in contact with the inner side of the skeleton (20).

2. The novel blood reservoir filter element according to claim 1, characterized in that: The frame (20) includes a chassis (22) and a frame (23). The frame (23) surrounds and connects to the periphery of the chassis (22). The snap-fit ​​groove (21) is provided on the chassis (22). The snap-fit ​​groove (21) includes a first inner side (211) and a second inner side (212) arranged opposite to each other. The first inner side (211) is closer to the center of the chassis (22) than the second inner side (212). The second inner side (212) and the inner side of the frame (23) are located on the same plane.

3. The novel blood reservoir filter element according to claim 2, characterized in that: The chassis (22) includes a central disc (221) and an edge disc (222) connected together. The snap-fit ​​groove (21) is disposed between the central disc (221) and the edge disc (222). The frame (23) is fixed to the edge disc (222). The height of the central disc (221) is higher than the height of the edge disc (222).

4. A novel blood reservoir filter element according to claim 3, characterized in that: The height of the central disk (221) gradually decreases from the center to the periphery.

5. A novel blood reservoir filter element according to claim 2, characterized in that: The chassis (22) has a weight-reducing groove (24) on its bottom side.

6. A novel blood reservoir filter element according to claim 2, characterized in that: The distance between the first inner side (211) and the second inner side (212) is equal, or the distance between the first inner side (211) and the second inner side (212) gradually decreases from the bottom of the snap-fit ​​groove (21) to the opening of the snap-fit ​​groove (21).

7. A novel blood reservoir filter element according to claim 1, characterized in that: The skeleton (20) is a cylindrical skeleton or a frustum-shaped skeleton.

8. A novel blood reservoir filter element according to claim 1, characterized in that: The filter screen is disposed on the outer side of the frame (20) or on the inner side of the frame (20).

9. A novel blood reservoir filter element according to claim 1, characterized in that: The filter screen is ultrasonically welded to the frame (20) to form an integral structure.

10. A novel blood reservoir filter element according to claim 1, characterized in that: The outer surface of the skeleton (20) is an arc surface.

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