Axial variable-size fat cutting and filtering device and fat cutting and filtering method

Abstract

The invention discloses an axial variable-size fat cutting and filtering device and a fat cutting and filtering method, and belongs to the technical field of fat separation. The axial variable-size fat cutting and filtering device comprises a first shell and a second shell, a first containing cavity is formed in the first shell, a second containing cavity is formed in the second shell, and the first containing cavity and the second containing cavity are spliced into an ellipsoidal filtering cavity; a feeding hole communicated with the filtering cavity is formed in one end of the filtering cavity, and a discharging hole communicated with the filtering cavity is formed in the other end of the filtering cavity; a cutting filter screen for cutting and filtering fat is arranged in the filter cavity, the cutting filter screen comprises a first cutting screen, and at least a second cutting screen and a third cutting screen are symmetrically arranged on the two sides of the first cutting screen respectively. By the adoption of the axial variable-size fat cutting and filtering device and the fat cutting and filtering method, the problems that an existing fat cutting and filtering device is prone to blockage, and the fat cutting and filtering efficiency is affected can be solved.

Description

Technical Field

[0001] This invention relates to the field of fat separation technology, and in particular to an axially variable-size fat cutting and filtering device and a fat cutting and filtering method. Background Technology

[0002] With the increasing demand for cosmetic surgery and related medical technologies, especially the widespread application of autologous fat transplantation technology in plastic and reconstructive surgeries, the market demand for fat tissue cutting and filtering devices is also growing.

[0003] Currently, mechanical force is commonly used in clinical practice to cut adipose tissue, including manual injection and electric cutting. Electric cutting devices have high fat cutting and filtration efficiency, but due to flawed filter pore design, the filtration effect is poor; uneven pressure distribution within the filter cavity and forced breakage by the motor lead to a high cell death rate. Furthermore, electric cutting devices are prone to bacterial growth during secondary use, aseptic cleaning is time-consuming and laborious, and the cost of single-use is too high.

[0004] The manual injection method involves adding a filter between connected syringes and repeatedly pushing and pulling to force fat through the filter, thus cutting it and filtering out connective tissue. However, the filter's pore size is not adjustable or difficult to replace; small-pore filters are prone to clogging and require laborious operation, while large-pore filters have poor cutting results. Summary of the Invention

[0005] The purpose of this invention is to provide an axially variable-size fat cutting and filtering device and a fat cutting and filtering method, which solves the problem that existing fat cutting and filtering devices are prone to clogging and affect fat cutting and filtering efficiency.

[0006] To achieve the above objectives, the present invention provides an axially variable-size fat cutting and filtering device, comprising an assembled first housing and a second housing. The first housing has a first receiving cavity inside, and the second housing has a second receiving cavity inside. The first receiving cavity and the second receiving cavity are assembled to form an ellipsoidal filtering cavity. One end of the filtering cavity is provided with a feed inlet communicating with the filtering cavity, and the other end of the filtering cavity is provided with a discharge outlet communicating with the filtering cavity. The filtering cavity is provided with a cutting filter screen for cutting and filtering fat. The cutting filter screen includes a first cutting screen disposed at the center of the filtering cavity, and at least a second cutting screen and a third cutting screen symmetrically disposed on both sides of the first cutting screen.

[0007] Preferably, the mesh size of the second cutting mesh is smaller than that of the third cutting mesh but larger than that of the first cutting mesh; the first, second, and third cutting meshes are all disc-shaped, and the diameter of the second cutting mesh is larger than that of the first cutting mesh but smaller than that of the third cutting mesh.

[0008] Preferably, the first housing includes a first body, and the second housing includes a second body. Both the first body and the second body are semi-ellipsoidal structures. One end of the first body is provided with a first feed pipe, and the other end of the first body is provided with a first discharge pipe. One end of the second body is provided with a second feed pipe, and the other end of the second body is provided with a second discharge pipe. The first feed pipe and the second feed pipe are assembled to form a feed inlet, and the first discharge pipe and the second discharge pipe are assembled to form a discharge outlet.

[0009] Preferably, the first feed tube and the second feed tube are provided with fixing sleeves to fix the first feed tube and the second feed tube, and the first discharge tube and the second discharge tube are provided with fixing sleeves to fix the first discharge tube and the second discharge tube. The inner surface of the fixing sleeve is provided with internal threads that are threaded to the first feed tube, the second feed tube, the first discharge tube and the second discharge tube, and the outer surface of the fixing sleeve is provided with external threads that are connected to the syringe.

[0010] Preferably, the inner surface of the first body is provided with a plurality of semi-circular first slots, and the inner surface of the second body is provided with a plurality of semi-circular second slots corresponding one-to-one with the first slots. The first cutting mesh, the second cutting mesh and the third cutting mesh are fitted into the circular slots formed by the first slots and the second slots. The first body has a protruding ring on one end face near the second body, and the second body has a groove on one end face near the first body that matches the protruding ring. The protruding ring is engaged in the groove to connect the first body and the second body.

[0011] Preferably, the cutting filter includes a filter screen and a fixed frame. The filter screen is connected to the first housing and the second housing through the fixed frame. The filter screen includes a central cutting blade located at the center of the filter screen. A central hole is provided at the center of the central cutting blade. Several coaxial annular cutting rings are provided outside the central cutting blade. A material passage hole for fat to pass through is provided between adjacent cutting rings. The cutting rings include several cutting arrays distributed in a circumferential array. Adjacent cutting arrays and cutting rings are connected by straight connecting sections. The cutting arrays include several cutting units distributed in a linear array.

[0012] Preferably, the central cutting edge is a regular hexagonal structure, the central hole is a regular hexagonal cutting edge, the cutting ring is a regular hexagonal structure including 6 identical cutting arrays, the cutting unit is a regular hexagonal structure, and the two ends of adjacent cutting units are connected; the cutting unit includes a top edge arranged on both sides of the cutting unit along the length direction of the cutting array, and a first side edge that is inclined outward on both sides of the top edge. The first side edges of adjacent cutting units are assembled to form an isosceles trapezoidal first cutting groove, and the first cutting groove is opposite to the top edge of the adjacent cutting array.

[0013] Preferably, the cutting filter screen includes a filter screen and a fixed frame, and the filter screen is connected to the first housing and the second housing through the fixed frame; the filter screen includes a number of horizontally arranged crossbeams and vertically arranged longitudinal beams, and the crossbeams and longitudinal beams are assembled into a number of square cutting units.

[0014] Preferably, the cutting unit includes a cutting blade, which is disposed on a crossbeam and a longitudinal beam, and the cutting blade is located at the center of the four sides of the cutting unit; the cutting blade includes a second side blade and a second cutting groove, the second side blade is disposed on both sides of the cutting blade and is parallel to the crossbeam or longitudinal beam, and the second cutting groove is disposed on the side of the cutting blade facing the center of the cutting unit, and the second cutting groove is an isosceles triangular groove.

[0015] The fat cutting and filtering method of the above-mentioned axially variable-size fat cutting and filtering device includes the following steps: S1. The first cutting mesh, the second cutting mesh, and the third cutting mesh are installed inside the first housing and the second housing. The first housing and the second housing are assembled. Both ends of the first housing and the second housing are connected to syringes. S2. The fat concentrate enters the filtration chamber through a syringe. First, it is cut and filtered through the third cutting mesh with larger openings, then through the second cutting mesh, and then through the first cutting mesh with the smallest openings. Finally, it is discharged from the filtration chamber through the second and third cutting meshes, completing the cutting and filtering of the fat.

[0016] The advantages and positive effects of the axially variable-size fat cutting and filtering device and method described in this invention are as follows: By setting the filter chambers inside the first and second shells into an ellipsoidal structure, the aperture of the cutting filter screen gradually decreases and then increases from the inlet end to the outlet end, effectively ensuring the smooth flow of fat and reducing the risk of blockage. The spider web-like design of the filter screen improves the uniformity of force on the filter screen, enhances the smoothness of fat flow, and reduces the risk of blockage; it also helps to reduce pressure drop and ensure cell activity.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is an exploded structural diagram of the axially variable-size fat cutting and filtering device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the axially variable-size fat cutting and filtering device according to an embodiment of the present invention; Figure 3 This is a three-dimensional structural diagram of the axially variable-size fat cutting and filtering device according to an embodiment of the present invention; Figure 4This is a schematic diagram of the first housing structure of the axially variable-size fat cutting and filtering device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the second housing structure of the axially variable-size fat cutting and filtering device according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the filter screen according to Embodiment 1 of the present invention; Figure 7 This is a front view schematic diagram of the filter screen structure according to Embodiment 1 of the present invention; Figure 8 For the appendix Figure 7 Enlarged view of A in the middle; Figure 9 This is a schematic diagram of the three-dimensional structure of the cut filter screen according to Embodiment 2 of the present invention; Figure 10 This is a front view schematic diagram of the cut filter screen according to Embodiment 2 of the present invention; Figure 11 For the appendix Figure 10 Enlarged view of B in the middle.

[0019] Figure Labels 1. First housing; 11. First body; 12. First feed pipe; 13. First discharge pipe; 14. Protruding ring; 15. First receiving cavity; 16. First slot; 2. Second housing; 21. Second body; 22. Second feed pipe; 23. Second discharge pipe; 24. Groove; 25. Second receiving cavity; 26. Second slot; 3. Fixing sleeve; 4. Cutting filter screen; 41. First cutting screen; 42. Second cutting screen; 43. Third cutting screen; 44. Fixing frame; 45. Filter screen; 46. Central cutting blade; 47. Central hole; 48. Connecting section; 49. Cutting array; 410. Material passage hole; 411. Cutting unit; 412. Top blade; 413. First side blade; 414. First cutting groove; 415. Crossbeam; 416. Longitudinal beam; 417. Cutting blade; 418. Second side blade; 419. Second cutting groove; 5. Filter chamber; 6. Feed inlet; 7. Discharge outlet. Detailed Implementation

[0020] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0022] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] Example 1 like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, an axially variable-size fat cutting and filtering device includes a first housing 1 and a second housing 2 assembled together. The first housing 1 includes a first body 11, and the second housing 2 includes a second body 21. Both the first body 11 and the second body 21 have a semi-ellipsoidal structure. The first housing 1 and the second housing 2 are assembled to form an ellipsoidal cutting and filtering device. The first housing 1 has a first receiving cavity 15 inside, and the second housing 2 has a second receiving cavity 25 inside. The first receiving cavity 15 and the second receiving cavity 25 are assembled to form an ellipsoidal filtering cavity 5. The ellipsoidal filtering cavity 5 helps to improve the uniformity of pressure distribution, avoid local high pressure or turbulence within the filtering cavity 5, improve the smoothness of fat flow, and reduce the probability of blockage.

[0024] A first feed pipe 12 is provided at one end of the first body 11, and a first discharge pipe 13 is provided at the other end of the first body 11. A second feed pipe 22 is provided at one end of the second body 21, and a second discharge pipe 23 is provided at the other end of the second body 21. The first feed pipe 12 and the second feed pipe 22 are assembled to form a feed inlet 6, and the first discharge pipe 13 and the second discharge pipe 23 are assembled to form a discharge outlet 7. The feed inlet 6 and the discharge outlet 7 are located at both ends of the filter chamber 5 and are connected to the filter chamber 5. The fat concentrate enters the cutting and filtering device through the feed inlet 6 and is discharged from the discharge outlet 7.

[0025] A protruding ring 14 is fixedly provided on the end face of the first body 11 near the second body 21, and a groove 24 adapted to the protruding ring 14 is provided on the end face of the second body 21 near the first body 11. The protruding ring 14 is engaged in the groove 24 to connect the first body 11 and the second body 21. The detachable first body 11 and second body 21 facilitate the installation and disassembly of the cutting filter 4, facilitate the cleaning and disinfection of the cutting filter device, and facilitate the reuse of the cutting filter device.

[0026] A fixing sleeve 3 is provided on the outside of the first feed tube 12 and the second feed tube 22 to fix the first feed tube 12 and the second feed tube 22. A fixing sleeve 3 is provided on the outside of the first discharge tube 13 and the second discharge tube 23 to fix the first discharge tube 13 and the second discharge tube 23. The fixing sleeve 3 seals and fixes the two ends of the first housing 1 and the second housing 2. The inner surface of the fixing sleeve 3 is provided with internal threads for threaded connection with the first feed tube 12, the second feed tube 22, the first discharge tube 13, and the second discharge tube 23, and the outer surface of the fixing sleeve 3 is provided with external threads for connection with the syringe. The threaded connection facilitates the assembly and disassembly of the first housing 1 and the second housing 2.

[0027] The filter chamber 5 is equipped with a cutting filter 4 for cutting and filtering fat. The cutting filter 4 includes a first cutting mesh 41 located at the center of the filter chamber 5, and at least two second cutting meshes 42 and three cutting meshes 43 symmetrically arranged on both sides of the first cutting mesh 41. The mesh size of the second cutting mesh 42 is smaller than that of the third cutting mesh 43 but larger than that of the first cutting mesh 41. The first cutting mesh 41, the second cutting mesh 42, and the third cutting mesh 43 are all disc-shaped, with the diameter of the second cutting mesh 42 being larger than that of the first cutting mesh 41 but smaller than that of the third cutting mesh 43. The first cutting mesh 41, the second cutting mesh 42, and the third cutting mesh 43 are evenly distributed within the filter chamber 5. In the fat cutting and filtering path, the fat first flows through the large-pore third cutting mesh 43, improving the smoothness of fat flow and separating coarse connective tissue, thus reducing blockage. Then, the fat passes through the second cutting mesh 42 with medium holes and finally through the first cutting mesh 41 with small holes. After secondary buffering, the fat is cut and filtered in a step-like manner, which effectively reduces the problem of clogging of the cutting filter 4 and improves the efficiency of fat cutting and filtering.

[0028] The cutting filter 4 includes a filter screen 45 and a fixing frame 44. The filter screen 45 is connected to the first housing 1 and the second housing 2 via the fixing frame 44. The filter screen 45 is a metal mesh, such as stainless steel mesh or titanium alloy mesh. The inner surface of the first body 11 is provided with several semi-circular first slots 16, and the inner surface of the second body 21 is provided with several semi-circular second slots 26 corresponding to the first slots 16. The fixing frame 44 is fitted into the circular slot formed by the first slots 16 and the second slots 26. The arrangement of the first slots 16 and the second slots 26 improves the stability of the cutting filter 4 in the filter chamber 5 and facilitates the installation and removal of the cutting filter 4.

[0029] like Figure 6 , Figure 7 , Figure 8 As shown, the filter screens 45 of the first cutting mesh 41, the second cutting mesh 42, and the third cutting mesh 43 have the same structure. Each filter screen 45 includes a central cutting blade 46 located at its center, with a central hole 47 at its center. The central cutting blade 46 has a regular hexagonal structure, and the central hole 47 has a regular hexagonal cutting edge. Both the central hole 47 and the outer surfaces of the central cutting blade 46 can cut and filter fat.

[0030] The central cutting blade 46 has several coaxial annular cutting rings on its outer side, with passage holes 410 between adjacent cutting rings to allow fat to pass through. As fat passes through the passage holes 410, the blades on both sides of the cutting rings cut the fat and filter the connective tissue. Each cutting ring includes several circumferentially arranged cutting arrays 49, with adjacent cutting arrays 49 and cutting rings connected by straight connecting sections 48. The cutting ring itself is a regular hexagonal structure comprising six identical cutting arrays 49.

[0031] The cutting array 49 includes several cutting units 411 arranged in a linear array. Each cutting unit 411 has a regular hexagonal structure, with the ends of adjacent cutting units 411 connected. Each cutting unit 411 includes a top blade 412 arranged along the length of the cutting array 49 on both sides of the cutting unit 411, and outwardly inclined first side blades 413 on both sides of the top blade 412. The first side blades 413 of adjacent cutting units 411 are assembled to form an isosceles trapezoidal first cutting groove 414, which faces the top blades 412 of the adjacent cutting array 49.

[0032] The filter screen 45 features a hexagonal, spiderweb-inspired design, ensuring even force distribution and low resistance, thus improving fat flow and reducing blockage. The large-pore filter screen first removes coarse connective tissue, preventing it from clogging the central pores. The cutting groove, in conjunction with the feed hole 410, shreds easily accumulated fibrous tissue, reducing buildup on the filter surface. The combined effect of the central hole 47, the top blade 412, the first side blade 413, and the cutting groove enables multi-directional, multi-angle cutting, resulting in more uniform fat particle distribution and avoiding the incomplete cutting often associated with traditional single-blade designs.

[0033] A fat cutting and filtering method for an axially variable-size fat cutting and filtering device includes the following steps: S1. The first cutting mesh 41, the second cutting mesh 42, and the third cutting mesh 43 are secured in the first slot 16 and the second slot 26 within the first housing 1 and the second housing 2. The first housing 1 and the second housing 2 are assembled using the protruding ring 14 and the groove 24. The two ends of the first housing 1 and the second housing 2 are fixedly connected by the fixing sleeve 3. Both ends of the first housing 1 and the second housing 2 are connected to syringes.

[0034] S2. The fat solution enters the filter chamber 5 through the syringe. First, it is cut and filtered through the third cutting mesh 43 with larger mesh size. Then, it is cut and filtered through the second cutting mesh 42. Next, it is cut and filtered through the first cutting mesh 41 with the smallest mesh size. Finally, it is discharged from the filter chamber 5 through the second cutting mesh 42 and the third cutting mesh 43, thus completing the cutting and filtering of the fat.

[0035] Example 2 like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, an axially variable-size fat cutting and filtering device includes a first housing 1 and a second housing 2 assembled together. The first housing 1 includes a first body 11, and the second housing 2 includes a second body 21. Both the first body 11 and the second body 21 have a semi-ellipsoidal structure. The first housing 1 and the second housing 2 are assembled to form an ellipsoidal cutting and filtering device. The first housing 1 has a first receiving cavity 15 inside, and the second housing 2 has a second receiving cavity 25 inside. The first receiving cavity 15 and the second receiving cavity 25 are assembled to form an ellipsoidal filtering cavity 5. The ellipsoidal filtering cavity 5 helps to improve the uniformity of pressure distribution, avoid local high pressure or turbulence within the filtering cavity 5, improve the smoothness of fat flow, and reduce the probability of blockage.

[0036] A first feed pipe 12 is provided at one end of the first body 11, and a first discharge pipe 13 is provided at the other end of the first body 11. A second feed pipe 22 is provided at one end of the second body 21, and a second discharge pipe 23 is provided at the other end of the second body 21. The first feed pipe 12 and the second feed pipe 22 are assembled to form a feed inlet 6, and the first discharge pipe 13 and the second discharge pipe 23 are assembled to form a discharge outlet 7. The feed inlet 6 and the discharge outlet 7 are located at both ends of the filter chamber 5 and are connected to the filter chamber 5. The fat concentrate enters the cutting and filtering device through the feed inlet 6 and is discharged from the discharge outlet 7.

[0037] A protruding ring 14 is fixedly provided on the end face of the first body 11 near the second body 21, and a groove 24 adapted to the protruding ring 14 is provided on the end face of the second body 21 near the first body 11. The protruding ring 14 is engaged in the groove 24 to connect the first body 11 and the second body 21. The detachable first body 11 and second body 21 facilitate the installation and disassembly of the cutting filter 4, facilitate the cleaning and disinfection of the cutting filter device, and facilitate the reuse of the cutting filter device.

[0038] A fixing sleeve 3 is provided on the outside of the first feed tube 12 and the second feed tube 22 to fix the first feed tube 12 and the second feed tube 22. A fixing sleeve 3 is provided on the outside of the first discharge tube 13 and the second discharge tube 23 to fix the first discharge tube 13 and the second discharge tube 23. The fixing sleeve 3 seals and fixes the two ends of the first housing 1 and the second housing 2. The inner surface of the fixing sleeve 3 is provided with internal threads for threaded connection with the first feed tube 12, the second feed tube 22, the first discharge tube 13, and the second discharge tube 23, and the outer surface of the fixing sleeve 3 is provided with external threads for connection with the syringe. The threaded connection facilitates the assembly and disassembly of the first housing 1 and the second housing 2.

[0039] The filter chamber 5 is equipped with a cutting filter 4 for cutting and filtering fat. The cutting filter 4 includes a first cutting mesh 41 located at the center of the filter chamber 5, and at least two second cutting meshes 42 and three cutting meshes 43 symmetrically arranged on both sides of the first cutting mesh 41. The mesh size of the second cutting mesh 42 is smaller than that of the third cutting mesh 43 but larger than that of the first cutting mesh 41. The first cutting mesh 41, the second cutting mesh 42, and the third cutting mesh 43 are all disc-shaped, with the diameter of the second cutting mesh 42 being larger than that of the first cutting mesh 41 but smaller than that of the third cutting mesh 43. The first cutting mesh 41, the second cutting mesh 42, and the third cutting mesh 43 are evenly distributed within the filter chamber 5. In the fat cutting and filtering path, the fat first flows through the large-pore third cutting mesh 43, improving the smoothness of fat flow and separating coarse connective tissue, thus reducing blockage. Then, the fat passes through the second cutting mesh 42 with medium holes and finally through the first cutting mesh 41 with small holes. After secondary buffering, the fat is cut and filtered in a step-like manner, which effectively reduces the problem of clogging of the cutting filter 4 and improves the efficiency of fat cutting and filtering.

[0040] The cutting filter 4 includes a filter screen 45 and a fixing frame 44. The filter screen 45 is connected to the first housing 1 and the second housing 2 via the fixing frame 44. The filter screen 45 is a metal mesh, such as stainless steel mesh or titanium alloy mesh. The inner surface of the first body 11 is provided with several semi-circular first slots 16, and the inner surface of the second body 21 is provided with several semi-circular second slots 26 corresponding to the first slots 16. The fixing frame 44 is fitted into the circular slot formed by the first slots 16 and the second slots 26. The arrangement of the first slots 16 and the second slots 26 improves the stability of the cutting filter 4 in the filter chamber 5 and facilitates the installation and removal of the cutting filter 4.

[0041] like Figure 9 , Figure 10 , Figure 11 As shown, the filter screens 45 of the first cutting mesh 41, the second cutting mesh 42, and the third cutting mesh 43 have the same structure. The filter screen 45 includes several horizontally arranged crossbeams 415 and longitudinally arranged longitudinal beams 416, which are integral structures. The crossbeams 415 and longitudinal beams 416 are assembled into several square cutting units 411.

[0042] The cutting unit 411 includes a cutting blade 417, which is mounted on a crossbeam 415 and a longitudinal beam 416, and is located at the center of the four sides of the cutting unit 411. The cutting blade 417 includes a second side blade 418 and a second cutting groove 419. The second side blade 418 is located on both sides of the cutting blade 417 and is parallel to the crossbeam 415 or the longitudinal beam 416. The second cutting groove 419 is located on the side of the cutting blade 417 facing the center of the cutting unit 411, and is an isosceles triangular groove.

[0043] The crossbeams 415 and longitudinal beams 416 form a regular fluid channel, allowing fat to flow directionally along the channel and reducing turbulence. The cutting blade 417 is located at the center of the unit, not blocking the main flow path, and its resistance is lower than that of traditional dense filters. The open structure of the square unit facilitates the passage of fat, and the triangular cutting groove of the cutting blade 417 can cut long fibrous connective tissue, preventing it from entangled in the filter. The gradient mesh intercepts coarse impurities in advance, reducing the risk of blockage in the square unit. The second side blade 418 of the cutting blade 417 and the triangular cutting groove form a "shearing + squeezing" dual action, precisely cutting the fat as it passes through, resulting in high particle uniformity. The dense distribution of units results in a higher cutting frequency than traditional filters.

[0044] A fat cutting and filtering method for an axially variable-size fat cutting and filtering device includes the following steps: S1. The first cutting mesh 41, the second cutting mesh 42, and the third cutting mesh 43 are secured in the first slot 16 and the second slot 26 within the first housing 1 and the second housing 2. The first housing 1 and the second housing 2 are assembled using the protruding ring 14 and the groove 24. The two ends of the first housing 1 and the second housing 2 are fixedly connected by the fixing sleeve 3. Both ends of the first housing 1 and the second housing 2 are connected to syringes.

[0045] S2. The fat solution enters the filter chamber 5 through the syringe. First, it is cut and filtered through the third cutting mesh 43 with larger mesh size. Then, it is cut and filtered through the second cutting mesh 42. Next, it is cut and filtered through the first cutting mesh 41 with the smallest mesh size. Finally, it is discharged from the filter chamber 5 through the second cutting mesh 42 and the third cutting mesh 43, thus completing the cutting and filtering of the fat.

[0046] To verify the technical effectiveness of the cutting and filtering device described in this invention, a simulation was performed on the fat cutting and filtering device described in Example 1. A fluid dynamics (CFD) model was established in COMSOL, and the particle tracking module was used to simulate the movement and interception process of fat microclusters. The fat particle size distribution and inlet flow rate were set, resulting in a fat throughput of 58%-90% for the filter. Maximum shear stress was also measured. With a stress of 0.13 Pa, the cell viability was approximately 87.6% by comparing the maximum shear stress with the cell tolerance threshold. This indicates that the filter can effectively capture fat clumps of different sizes, achieving the cutting and retention of coarse particles and providing a filtering effect. The filter of this invention, through a spiderweb-inspired biomimetic design, can evenly distribute pressure, reduce shear force, and maintain cell structure and activity.

[0047] A simplified calculation was performed using a porous media (Darcy flow) model. Pressure values ​​before and after the three filter screens were obtained, and the pressure drops ΔP1 (third cut screen 43), ΔP2 (second cut screen 42), and ΔP3 (first cut screen 41) were analyzed. ΔP1 was approximately 1.2 kPa, ΔP2 was approximately 2.7 kPa, and ΔP3 was approximately 6.7 kPa. The total pressure drop ΔPtotal was approximately 10.6 kPa. This invention effectively disperses fluid resistance by using cascaded decreasing pore sizes, ensuring the fluidity of fats and reducing the risk of blockage.

[0048] Using CFD steady-state flow field simulation, the flow uniformity index U was calculated to be approximately 0.9, with a maximum small channel flow ratio of 1:1.1. This invention improves the uniformity of flow distribution through multiple parallel channels, eliminating significant flow deviation and enhancing the uniformity of fat flow.

[0049] Therefore, the axially variable size fat cutting and filtering device and fat cutting and filtering method described in this invention can solve the problem that existing fat cutting and filtering devices are prone to clogging, which affects the fat cutting and filtering efficiency.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An axially variable-size fat cutting and filtering device, characterized in that: The device includes a first housing and a second housing, which are assembled together. The first housing has a first receiving cavity inside, and the second housing has a second receiving cavity inside. The first receiving cavity and the second receiving cavity are assembled to form an ellipsoidal filter cavity. One end of the filter cavity is provided with an inlet communicating with the filter cavity, and the other end of the filter cavity is provided with an outlet communicating with the filter cavity. The filter cavity is provided with a cutting filter screen for cutting and filtering fat. The cutting filter screen includes a first cutting screen located at the center of the filter cavity, and at least a second cutting screen and a third cutting screen symmetrically arranged on both sides of the first cutting screen.

2. The axially variable-size fat cutting and filtering device according to claim 1, characterized in that: The mesh size of the second cutting mesh is smaller than that of the third cutting mesh but larger than that of the first cutting mesh; the first, second, and third cutting meshes are all disc-shaped, and the diameter of the second cutting mesh is larger than that of the first cutting mesh but smaller than that of the third cutting mesh.

3. The axially variable-size fat cutting and filtering device according to claim 1, characterized in that: The first housing includes a first body, and the second housing includes a second body. Both the first body and the second body are semi-ellipsoidal structures. One end of the first body is provided with a first feed pipe, and the other end of the first body is provided with a first discharge pipe. One end of the second body is provided with a second feed pipe, and the other end of the second body is provided with a second discharge pipe. The first feed pipe and the second feed pipe are assembled to form a feed inlet, and the first discharge pipe and the second discharge pipe are assembled to form a discharge outlet.

4. The axially variable-size fat cutting and filtering device according to claim 3, characterized in that: The first feed tube and the second feed tube are provided with fixing sleeves to fix the first feed tube and the second feed tube. The first discharge tube and the second discharge tube are provided with fixing sleeves to fix the first discharge tube and the second discharge tube. The inner surface of the fixing sleeve is provided with internal threads that are threaded to the first feed tube, the second feed tube, the first discharge tube and the second discharge tube. The outer surface of the fixing sleeve is provided with external threads that are connected to the syringe.

5. The axially variable-size fat cutting and filtering device according to claim 3, characterized in that: The inner surface of the first body is provided with a plurality of semi-circular first slots, and the inner surface of the second body is provided with a plurality of semi-circular second slots corresponding one-to-one with the first slots. The first cutting mesh, the second cutting mesh and the third cutting mesh are fitted into the circular slots formed by the first slots and the second slots. The first body has a protruding ring on one end face near the second body, and the second body has a groove on one end face near the first body that matches the protruding ring. The protruding ring is engaged in the groove to connect the first body and the second body.

6. The axially variable-size fat cutting and filtering device according to claim 1, characterized in that: The cutting filter includes a filter screen and a fixed frame. The filter screen is connected to the first housing and the second housing through the fixed frame. The filter screen includes a central cutting blade located at the center of the filter screen. A central hole is provided at the center of the central cutting blade. Several coaxial annular cutting rings are provided outside the central cutting blade. A material passage hole is provided between adjacent cutting rings to allow fat to pass through. The cutting rings include several cutting arrays distributed in a circumferential array. Adjacent cutting arrays and cutting rings are connected by straight connecting sections. The cutting arrays include several cutting units distributed in a linear array.

7. The axially variable-size fat cutting and filtering device according to claim 6, characterized in that: The central cutting edge is a regular hexagonal structure, the central hole is a regular hexagonal cutting edge, the cutting ring is a regular hexagonal structure including 6 identical cutting arrays, the cutting unit is a regular hexagonal structure, and the two ends of adjacent cutting units are connected; the cutting unit includes a top edge arranged on both sides of the cutting unit along the length direction of the cutting array, and a first side edge that is inclined outward on both sides of the top edge. The first side edges of adjacent cutting units are assembled to form an isosceles trapezoidal first cutting groove, and the first cutting groove is opposite to the top edge of the adjacent cutting array.

8. The axially variable-size fat cutting and filtering device according to claim 1, characterized in that: The cutting filter screen includes a filter screen and a fixed frame. The filter screen is connected to the first housing and the second housing through the fixed frame. The filter screen includes several horizontally arranged crossbeams and vertically arranged longitudinal beams. The crossbeams and longitudinal beams are assembled into several square cutting units.

9. The axially variable-size fat cutting and filtering device according to claim 8, characterized in that: The cutting unit includes a cutting blade, which is mounted on a crossbeam and a longitudinal beam. The cutting blade is located at the center of the four sides of the cutting unit. The cutting blade includes a second side blade and a second cutting groove. The second side blade is mounted on both sides of the cutting blade and is parallel to the crossbeam or longitudinal beam. The second cutting groove is mounted on the side of the cutting blade facing the center of the cutting unit and is an isosceles triangular groove.

10. A fat cutting and filtering method for an axially variable-size fat cutting and filtering device according to any one of claims 1-9, characterized in that, Includes the following steps: S1. The first cutting mesh, the second cutting mesh, and the third cutting mesh are installed inside the first housing and the second housing. The first housing and the second housing are assembled. Both ends of the first housing and the second housing are connected to syringes. S2. The fat concentrate enters the filtration chamber through a syringe. First, it is cut and filtered through the third cutting mesh with larger openings, then through the second cutting mesh, and then through the first cutting mesh with the smallest openings. Finally, it is discharged from the filtration chamber through the second and third cutting meshes, completing the cutting and filtering of the fat.

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