A closed loop filling system applied to a porous implant
By using a closed-loop dynamic filling system to simulate the natural bone formation process, the system achieves precise filling of porous implants, overcoming the bottleneck of traditional filling techniques and improving the therapeutic effect of porous implants and the quality of life of patients.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YIQIANGU (BEIJING) MEDICAL TECH CO LTD
- Filing Date
- 2025-04-07
- Publication Date
- 2026-07-10
Smart Images
Figure CN224474490U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to medical devices, and more specifically, to a closed-loop filling system for porous implants, particularly an internal material filling system for porous implants. It is primarily used to address the problem of precise filling of porous implants in situations involving damage, necrosis, or defects in tissues such as bone, cartilage, muscle, and fat, as well as organs. The focus is on technical solutions to improve the reconstruction and microcirculation of these tissues and organs. Background Technology
[0002] In the medical field, a series of diseases caused by damage, necrosis or defects of tissues and organs such as bones, muscles, fat, etc. seriously threaten patients' quality of life and physical health. Traditional treatment methods have many problems that cannot be ignored, while the development of new treatment technologies faces the bottleneck of filling technology. Clinical needs are extremely urgent.
[0003] Avascular necrosis of the femoral head (ONFH) is a common and challenging condition in orthopedics. It is primarily caused by insufficient blood supply to the femoral head due to various factors, leading to ischemia and necrosis of bone cells, fracture of bone trabeculae, and ultimately, collapse of the femoral head. Without effective treatment, approximately 80% of patients will experience femoral head collapse within 1-4 years, resulting in joint dysfunction, often requiring total joint replacement surgery to alleviate symptoms. However, total joint replacement surgery is expensive (approximately 50,000-150,000 RMB for a single joint replacement), and the lifespan of artificial joints is limited (generally 10-15 years). Younger and middle-aged patients also face various postoperative complications such as infection and thrombosis, as well as challenges like revision surgery and secondary replacement. The increased difficulty and risk of repeat surgery further exacerbate the financial burden on patients and significantly reduce their quality of life. In recent years, the incidence of ONFH has been on the rise and increasingly affects younger patients; therefore, early treatment methods that preserve the patient's own joint function have received considerable attention.
[0004] Besides avascular necrosis of the femoral head, nonunion and bone defects caused by traumatic fractures, bone tumor resection, and other reasons are also common. For example, long bone fractures caused by traffic accidents or workplace injuries can easily lead to nonunion and bone defects if not treated properly. Among traditional treatment methods, autologous bone transplantation has good biocompatibility, but the source of bone donors is limited, and the bone harvesting process can cause additional trauma to patients; allogeneic bone transplantation carries the risks of immune rejection and disease transmission; and the integration of artificial bone materials with the host bone and the matching of mechanical properties still need improvement.
[0005] In the field of oral and maxillofacial surgery, jawbone defects are mostly caused by trauma, tumor resection, congenital diseases, etc. Jawbone defects not only affect facial appearance and functions such as chewing and speech, but also negatively impact patients' mental health. Current repair methods, such as autologous bone grafting, require creating a second surgical site, increasing patient pain and surgical risks; artificial bone materials have shortcomings in terms of integration with surrounding tissues and bone regeneration capacity. Moreover, the complex anatomy of the oral and maxillofacial region demands extremely high precision and uniformity in the filling of repair materials, requirements that existing filling techniques struggle to meet.
[0006] Due to its avascular nature and low regenerative capacity, cartilage tissue is difficult to heal itself after damage. Traditional treatments (such as microfracture surgery and autologous chondrocyte transplantation) suffer from problems such as a mismatch between the mechanical properties of the repaired tissue and natural cartilage, and poor long-term efficacy. Novel cartilage implants (such as collagen scaffolds and hydrogel carriers) require precise filling with chondrocytes or bioactive materials, but current filling techniques cannot achieve uniform cell distribution, leading to fibrosis of the repaired tissue or insufficient cartilage differentiation, which affects the recovery of joint function.
[0007] Traditional treatments for muscle injury repair have significant shortcomings: autologous muscle transplantation requires harvesting healthy tissue from the patient's own body, carries a high risk of donor site damage, and results in limited muscle function recovery after repair; cell transplantation (such as muscle satellite cells) uses a static injection method, leading to low cell survival rates and uneven distribution, and lacks effective simulation of the dynamic muscle microenvironment, resulting in poor neuromuscular function reconstruction efficiency. In tissue engineering, muscle-inducing scaffolds need to be simultaneously filled with multiple functional components (myocellular cells, vascular endothelial cells, growth factors, etc.), but traditional filling techniques cannot simulate the mechanical conditions of the muscle microenvironment, leading to decreased growth factor activity, insufficient angiogenesis, and weak interfacial bonding, ultimately affecting the recovery of limb motor function. Therefore, a more precise dynamic filling technique is urgently needed to overcome the current repair bottlenecks.
[0008] In the field of adipose tissue repair and cosmetic procedures, autologous fat grafting is an important method for soft tissue filling (such as facial rejuvenation and breast reconstruction). However, its clinical effectiveness is limited by the inherent defects of traditional filling techniques. Traditional manual injection methods result in a high rate of mechanical damage to fat particles. The hypoxic environment after transplantation induces a large number of adipocyte apoptosis, ultimately leading to low survival rates and a high risk of complications such as cysts and calcification. In the repair of large-area soft tissue defects (such as post-traumatic depression deformities and tissue reconstruction after tumor resection), adipose tissue engineering scaffolds need to be loaded with adipose-derived stem cells (ADSCs) and vascular endothelial cells to promote fat regeneration and vascularization. However, existing static filling techniques cannot achieve a uniform distribution of fat particles and growth factors (such as VEGF), resulting in a significant decrease in the survival rate of adipocytes in the central area of the scaffold, insufficient neovascularization density, and poor maintenance of soft tissue volume after repair. In addition, fat grafting requires extremely high filling precision, especially in delicate areas of the face. Traditional methods, due to a lack of dynamic control capabilities, often result in local unevenness or excessive absorption, requiring multiple surgical corrections, increasing patient suffering and treatment cycles.
[0009] With the development of 3D bioprinting technology, vascularized tissue engineering scaffolds and artificial organ implants (such as heart patches and vascular grafts) have placed higher demands on filling techniques.
[0010] In cell / material composite filling, seed cells (such as mesenchymal stem cells) and extracellular matrix materials (such as hyaluronic acid and chitosan) need to be uniformly filled into a porous scaffold. Existing manual filling methods result in low cell survival rate and uneven distribution.
[0011] In functionalization modifications, the precise filling of angiogenic factors (such as VEGF) and neural-guided materials requires precise control of flow rate and pressure, which is difficult to achieve using traditional methods.
[0012] In allogeneic organ transplantation, the vascularization pretreatment of porous biological scaffolds (such as decellularized matrix) requires dynamic cyclic filling with endothelial cell suspension. Existing static filling methods result in low efficiency of vascular network formation (vessel density <10 vessels / mm²). 2 This method cannot meet the blood supply needs of transplanted organs.
[0013] It is evident that with the continuous development of materials science and medical technology, porous implants, due to their unique structure and good biocompatibility, have been widely used in the repair of bone, cartilage, muscle, fat, and other tissues and organs. These porous implants provide three-dimensional space for the growth of new cells, promote blood vessel ingrowth, and facilitate the reconstruction of new tissues. However, in practical applications, filling techniques have become a key factor limiting treatment outcomes. Currently, manual filling is commonly used in clinical practice. This method is not only inconvenient to operate but also makes it difficult to guarantee the quality and effectiveness of the filling, easily leading to uneven filling, unfilled or overfilled pores in the porous implant, and other problems, thus affecting the integration of the implant with surrounding tissues and reducing the success rate of repair.
[0014] Faced with the aforementioned clinical challenges, the development of novel treatment technologies has placed higher demands on filling techniques. On the one hand, novel nano-hydroxyapatite / collagen composite materials have shown great potential in tissue repair, but these smart materials require specific deposition conditions (such as flow rates of 0.5-2 mL / min and pressures of 3-5 kPa), which traditional filling methods simply cannot meet. On the other hand, with the development of minimally invasive surgery, the requirements for the integration and convenience of surgical equipment are increasing. Filling systems need to be able to be rapidly deployed intraoperatively, shortening incision length to 3-5 cm to reduce patient trauma and postoperative recovery time. Simultaneously, the concept of precision medicine is gaining popularity, requiring the filling process to be linked with intraoperative navigation systems to achieve precise planning and real-time feedback of the filling path, thereby improving the accuracy and effectiveness of filling.
[0015] like Figure 10-12 As shown, taking a bone implant used in the ONFH treatment procedure as an example, the assembled state of the bone implant is illustrated. The scaffold includes: a scaffold housing 9 and a base 10.
[0016] The scaffold, as a supporting implant, can be provided for insertion into surgical sites (such as holes in the bone), and in this specific example, into the femoral head. It should be noted that the supporting implant is referred to as the head end on the inner side of the implanted bone and the tail end on the outer side. The scaffold housing 9 includes a porous portion at the head end and a connecting portion at the tail end. The porous portion can be a 3D-printed, integrally porous material with interconnected voids. The connecting portion is located at the tail end of the porous portion.
[0017] The connecting part of the bracket housing 9 has a tail end opening that connects to the internal cavity of the bracket housing 9, through which internal filler can be placed into the internal cavity of the bracket housing 9. The bracket housing 9 has a cup-shaped outer wall 91 made of porous material and forms a longitudinally extending inner cavity 92.
[0018] The inner cavity 92 of the outer shell 9 can be filled with materials such as healthy autologous bone, allogeneic bone, artificial bone, bioactive materials, cells, and growth factors to promote the repair of surrounding bone. The filler is also attached to the porous material of the outer wall 91, meaning the filler in the inner cavity, the filler on the porous material of the outer wall 91, and the autologous bone around the bone pores are completely fused together. The autologous bone can be selected from bone tissue material drilled during the main surgery; backfilling avoids intraoperative loss, and the use of autologous bone aids in bone repair. The artificial bone induction material can also be selected from one or more of the following: artificial bone synthesized from collagen + sodium alginate + nano-hydroxyapatite, artificial bone synthesized from collagen + nano-hydroxyapatite, hydroxyapatite (HA), tricalcium phosphate (TCP), and bidirectional calcium phosphate (BCP). Bioactive materials include, for example, platelet-rich plasma (PRP).
[0019] In actual surgical applications, the outer wall 91 and inner cavity 92 of the porous material stent shell 9 need to be filled with corresponding materials, and the filling material needs to achieve adhesion and tight filling within the pores of the porous material. In actual applications, the filling operation is performed during surgery, which is inconvenient and does not achieve the desired filling effect. Utility Model Content
[0020] This invention aims to overcome the shortcomings of existing technologies by proposing a closed-loop dynamic filling system. This system innovatively simulates the biomimetic mineralization mechanism during natural bone formation, promoting the directional deposition of materials through fluid circulation; it meets the specific deposition conditions required by smart materials; it adapts to the trend of minimally invasive surgery, enabling integrated device design and rapid intraoperative deployment; and it can be linked with intraoperative navigation systems to meet the needs of precision medicine. The closed-loop dynamic filling system provides multi-scenario solutions for bone, cartilage, muscle, fat, and organ implants, breaking through the tissue-specific limitations of traditional technologies, significantly improving the clinical efficacy and technological foresight of biomaterial implantation, reducing patient suffering and economic burden, and promoting the development of medicine in the field of tissue repair.
[0021] A closed-loop filling system for porous implants, comprising a storage assembly, a filling assembly, a circulation assembly, and a base assembly, characterized in that:
[0022] The upper surface of the base assembly has multiple mounting holes for mounting the storage assembly, filling assembly and circulation assembly, respectively.
[0023] The storage component is connected to the first mounting port on the base component via the bottom interface;
[0024] The filling component includes a container in which a porous implant is placed;
[0025] The bottom interface of the container connects to the third mounting port on the base assembly;
[0026] The circulation component inlet is connected to the fourth mounting port on the base component;
[0027] The return water pipe is connected to the second mounting port on the base assembly via one end interface, and the other end is connected to the filling assembly;
[0028] The outlet of the circulation component is connected to the water injection pipe, which is then connected to the storage component.
[0029] Furthermore, the mounting ports of the base assembly adopt threaded connections or quick-connect interfaces.
[0030] Furthermore, fluid channels, including return water channels and drainage channels, are machined within the base assembly;
[0031] The return water channels are connected to the first installation port and the second installation port respectively;
[0032] The drainage channels are connected to the third and fourth installation ports respectively.
[0033] Furthermore, the container consists of multiple components, including a lower filter assembly, a middle sedimentation chamber, and an upper sealing joint.
[0034] Furthermore, the lower filter assembly is formed by the interlocking of the upper and lower components, with a filter sheet placed in the middle;
[0035] The upper and lower components interlock to form an integrated filter assembly, which is placed in the third mounting port on the base assembly.
[0036] Furthermore, the sedimentation chamber in the middle is installed in the third mounting port via a threaded connection or a quick-connect connection, while simultaneously positioning the filter assembly in the third mounting port.
[0037] Furthermore, a support recess is formed on the upper surface of the upper component, and multiple support ribs are formed in the support recess;
[0038] A porous implant is placed in the deposition chamber, and an elastic filter layer is wrapped around the outside of the porous implant before it is fixed and positioned using support ribs.
[0039] Furthermore, the upper sealing connector presses against the tail end of the porous implant to secure it; the sealing connector is connected to the fluid lines in the filling assembly using a flexible hose.
[0040] Furthermore, the filling assembly includes an upper chamber and a lower chamber, with the container located in the lower chamber and a buffer mesh layer and a liquid collection plate formed in the upper chamber to guide the fluid.
[0041] Furthermore, the storage assembly is equipped with a multi-stage filter, which includes multiple filtration sections, each with a different filtration mesh size.
[0042] This invention breaks through the bottlenecks of traditional filling technology through biomimetic mineralization mechanism, closed circulation system, modular design and precise control technology, and achieves improvements in filling effect, operation efficiency, infection control and cost optimization, and has significant clinical application value.
[0043] The specific advantages are as follows:
[0044] I. Innovative Applications of Biomimetic Mineralization Mechanisms
[0045] Dynamic deposition enhances bonding strength:
[0046] ■ By simulating the natural bone mineralization process through a closed-loop system, the fluid circulation drives the filling slurry to continuously flush the porous implant, causing materials such as cells, growth factors, nano-hydroxyapatite, autologous bone, allogeneic bone, artificial bone, bioactive materials, and composite materials to be deposited in the pores in a directional manner, forming a natural bone trabecular structure and improving the bonding strength.
[0047] ■ The elastic filter layer and support rib design in the container ensure uniform material deposition, avoid stress concentration, and reduce the risk of postoperative displacement.
[0048] Smart material adaptability:
[0049] ■ The multi-stage filter supports different mesh sizes (e.g., 50-500 mesh) and can dynamically adjust the filtration precision according to the particle size of the filling material (e.g., 100-800μm) to ensure optimal deposition conditions for materials such as cells, growth factors, nano-hydroxyapatite, autologous bone, allogeneic bone, artificial bone, bioactive materials, and composite materials.
[0050] II. Functional optimization of closed-loop systems.
[0051] Fluid dynamics optimization of U-shaped pipes:
[0052] ■ A U-shaped structure (H1>H2>H3) is formed by the storage assembly (height H1), the horizontal section of the return water pipe (height H2), and the filling assembly (height H3), achieving the following function through the liquid level difference:
[0053] Solid-liquid separation: During operation, the storage component maintains a high liquid level, while the filling component circulates to maintain a small amount of filling liquid, avoiding waste of filling material and improving subsequent dehydration efficiency.
[0054] Self-balancing circulation: Utilizes the siphon effect to reduce pump energy consumption, and stabilizes the circulation flow rate at the optimal flow rate (e.g., 1.5 mL / min ± 10%) to ensure uniform filling.
[0055] Integrated negative pressure dehydration design:
[0056] ■ After filling, the negative pressure drainage component is used to quickly remove the moisture from the material, shortening the operation time to within 15 minutes, while reducing the risk of postoperative infection.
[0057] III. Modular integration and precise control.
[0058] Intraoperative rapid response capability:
[0059] ■ The base assembly design integrates storage, filling, and circulation modules, supporting rapid assembly and adapting to the needs of minimally invasive surgery.
[0060] ■Utilizes transparent return water pipes to monitor water quality changes in real time. When the light transmittance is >95%, it triggers a stop circulation to avoid overfilling.
[0061] Improving implant compatibility across multiple application scenarios:
[0062] ■ The collection plate and buffer mesh layer can ensure stable filling pressure, improve filling density, and avoid the settling of fusion device implant material in spinal fusion surgery.
[0063] ■ The elastic filter layer ensures the surface roughness of the deposited material, meeting the requirements of the implant's outer surface during jawbone repair surgery;
[0064] ■ Multi-stage filters support composite filling of one or more materials such as cells, growth factors, nano-hydroxyapatite, autologous bone, allogeneic bone, artificial bone, bioactive materials, and composite materials. Composite materials can be used to fill bone defects to promote vascularization.
[0065] IV. Increase clinical value and economic benefits.
[0066] Cost and efficiency optimization:
[0067] ■ Autologous tissue and material filling can be performed quickly in the operating room without the need for a second surgery. This improves material utilization, reduces the cost per surgery, shortens the operation time, and reduces complications related to anesthesia.
[0068] Infection control innovation
[0069] ■ Closed systems reduce material exposure time and, in conjunction with filter components, intercept foreign objects, resulting in a lower infection rate compared to open systems.
[0070] V. Functional structural innovation.
[0071] ■ Multi-stage filtration components: Vertically stacked filter sections support quick replacement of filters with different mesh sizes to meet individual needs;
[0072] ■ Buffer and guide structure: The combination of a conical buffer mesh layer and a liquid collection plate achieves uniform fluid distribution;
[0073] ■ Elastic retention design: The elastic filter layer and the support ribs work together to ensure stable retention of the implant. Attached Figure Description
[0074] Figure 1 System composition 3D diagram;
[0075] Figure 2 System composition cross-sectional diagram;
[0076] Figure 3 Schematic diagram of the material storage assembly;
[0077] Figure 4 , 5 Schematic diagram of the filling component;
[0078] Figure 6 Enlarged view of a portion of the container;
[0079] Figure 7-9 Schematic diagram of the container structure;
[0080] Figure 10-12 This is a schematic diagram of a porous material scaffold implant.
[0081] In the diagram: 1. Storage assembly, 11. Storage cover, 12. Outer cylinder, 13. Bottom of cylinder, 14. Filter section, 2. Return water pipe, 3. Filling assembly, 31. Filling cover, 32. Cylinder, 321. Upper chamber, 322. Lower chamber, 323. Collection plate, 324. Buffer mesh layer, 34. Operation port, 4. Circulation assembly, 5. Storage tank, 6. Water injection pipe, 7. Base assembly, 71. First mounting port, 72. Second mounting port, 73. Third mounting port, 74. Fourth mounting port, 75. Fifth mounting port, 76. Drain valve, 77. Return water channel, 78. Drain channel, 8. Container, 81. Filter assembly, 811. Lower element, 812. Upper element, 813. Support rib, 814. Filter sheet, 82. Sedimentation chamber, 83. Sealing joint, 84. Elastic filter layer, 85. Sealing ring, 86. Connecting hose, 9. Support shell (porous implant), 91. Outer wall, 92. Inner cavity, 10. Base, 11. Detailed Implementation
[0082] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0083] like Figure 1 , 2As shown, a closed-loop filling system for porous implants includes a storage component 1, a filling component 3, and a circulation component 4. The storage component 1, filling component 3, and circulation component 4 are all mounted on a base component 7. The upper surface of the base component 7 has multiple mounting openings for mounting the storage component 1, filling component 3, and circulation component 4, respectively.
[0084] like Figure 3 As shown, the storage assembly 1 adopts a cylindrical structure with a certain height for holding the material to be filled. The material is pre-crushed and prepared. The storage assembly 1 includes an outer cylinder 12, with a cylinder bottom 13 installed and connected to the lower end of the outer cylinder 12. The upper surface of the cylinder bottom 13 forms a conical liquid collection area, and the lower surface forms a water outlet pipe. The water outlet pipe is connected to the first mounting port 71 on the base assembly 7 by threads or other quick-connect methods. A multi-stage filter is also vertically arranged inside the outer cylinder 12. The multi-stage filter includes multiple filter sections 14, each of which consists of a wall cylinder and a filter screen at the bottom. The wall cylinder is fitted with the inner diameter of the outer cylinder 12 and can slide and be positioned inside the outer cylinder 12. Each filter section is positioned by upper and lower support of the wall cylinder.
[0085] Each filter screen has a different mesh size. The mesh size of each section of the multi-stage filter can be selected based on the pore size of the porous implant and the particle size of the filling material. The configuration principle is from top to bottom, with the mesh size of each section increasing. A connecting cap is installed at the upper end of the outer cylinder 12. After the cap is screwed onto the outer cylinder 12, a closed internal material mixing and filtration working space is formed inside the material storage assembly 1. A water injection pipe 6 is also connected to the cap, and the water injection pipe 6 is connected to the circulation assembly 4.
[0086] The configured filter sections are sequentially placed into the outer cylinder 12. The uppermost filter section 14 serves as a storage container, where pre-crushed and prepared filling material is placed. The appropriate material weight is selected based on the size and type of the porous implant being filled. After a suitable amount of material is placed into the storage component 1, the cylinder cap is screwed on, and the circulation component 4 is activated. The carrier liquid is injected into the storage component 1, mixing with the filling material to form a mixture (filling slurry). This mixture then passes through a multi-stage filter, filtering out coarser particles. Finer particles can enter the downstream fluid pipeline through the outlet pipe at the bottom 13 and continue into the filling component 3 for filling the porous implant. During operation, the circulation component 4 continuously circulates the carrier liquid into the storage component 1, effectively impacting and mixing the filling material through multi-stage filtration, ensuring full utilization of the filling material.
[0087] like Figure 4 , 5As shown, the filling component 3 also adopts a cylindrical structure, and a liquid collection plate 323 is provided in the middle of its cylindrical cavity. The liquid collection plate 323 divides the cylindrical cavity into two independent upper and lower parts.
[0088] The upper chamber 321 serves to guide the fluid. The bottom of the upper chamber 321 is a collection plate 323, which collects the filling slurry. The collection plate 323 is conical, with its lower tip connected to the lower chamber 322 via an outlet 324. A buffer mesh layer 33, also conical in shape, is fitted to the upper port of the upper chamber 321, and an array of perforations is machined onto it. The buffer mesh layer 33 can be made of either a rigid or flexible material. The upper port of the upper chamber 321 is sealed by a cap. A return water pipe 2 is connected to the cap.
[0089] One end of the return water pipe 2 is connected to the second mounting port 72 on the base assembly 7. The filling slurry from the storage assembly 1 enters the upper chamber 321 after passing through the return water pipe 2. To prevent the high-velocity fluid at the outlet of the return water pipe 2 from impacting the container 8 in the lower chamber 322, the fluid needs to be buffered and guided in the upper chamber 321. A buffer mesh layer 33 is set below the outlet of the return water pipe 2. The high-velocity fluid at the outlet of the return water pipe 2 directly impacts the buffer mesh layer 33 for guidance, and then forms a uniformly distributed flow field with a lower velocity through the array of holes on the buffer mesh layer 33.
[0090] Furthermore, the low-velocity uniform flow field below the buffer mesh layer 33 will be collected by the conical liquid collection plate 323 and continue to flow into the container 8 below through the outlet pipe. The fluid flow rate entering the container 8 remains constant, which helps the solid components flowing into the container 8 to adhere and deposit on the porous implant.
[0091] like Figure 6 As shown, the lower chamber 322 below the collection plate 323 is used to place and install the target porous implant.
[0092] A container 8 is provided in the lower chamber 322. The porous implant can be placed in the container 8 and connected to the fluid line. The container 8 is used to place the porous implant and serves as a working space for the deposition of filling material in the slurry on the porous implant.
[0093] like Figure 7-9As shown, the container 8 consists of multiple components, including a lower filter assembly 81, a middle sedimentation chamber 82, and an upper sealing joint 83. The lower filter assembly 81 is formed by the interlocking of an upper element 812 and a lower element 811. A mating recess is formed on the upper surface of the lower element 811, within which a filter element 814 can be placed. The upper element 812 can be screwed into or pressed into the mating recess of the lower element 811 to position the filter element 814. After the upper element 812 is screwed into or pressed into the mating recess, the upper element 812 and the lower element 811 interlock to form an integral filter assembly 81, which can be placed in the third mounting port 73 on the base assembly 7. The filter element 814 allows liquid to pass through while filtering out solid materials; the pores of the filter element 814 are slightly smaller than the pores of the actual support. The middle sedimentation chamber 82 is threaded onto the third mounting port 73, simultaneously positioning the filter assembly 81 placed in the third mounting port 73. The central deposition chamber 82 serves as the area for accommodating porous implants.
[0094] Taking the bone implant used in ONFH treatment as an example, the porous implant is cylindrical, and the deposition chamber 82 can also be designed as a tube. However, it is not limited to this. For porous implants in different application scenarios, the deposition chamber can be designed with corresponding chamber structures as needed, so as to adapt to porous implants with different shapes.
[0095] The upper surface of the upper component 812 also has a support recess, in which multiple support ribs 813 are formed. The gaps between the multiple support ribs 813 form fluid passages. When the porous implant is placed into the deposition chamber 82, an elastic filter layer 84 is first fitted over the outside of the porous implant. The elastic filter layer 84 is made of an elastic filter material. The elastic filter layer 84 covers the outer peripheral surface of the porous implant, which can trap the solid components in the filling slurry. Under the containment effect of the elastic filter layer 84, the solid components are deposited on the porous implant to form a smooth surface. When the porous implant with the elastic filter layer 84 is placed into the deposition chamber 82, the inner diameter of the deposition chamber is larger than the outer diameter of the elastic filter layer, so that there is a certain flow gap between the elastic filter layer 84 and the deposition chamber 82.
[0096] The head end of the porous implant is pressed against multiple support ribs 813 in the support recess, and then screwed into the deposition chamber 82 using the upper sealing connector 83. The sealing connector 83 presses against the tail end 11 of the porous implant to fix the porous implant in place. The sealing connector 83 can be connected to the outlet pipe below the collection plate 323 using an elastic hose 86. The filling slurry in the upper chamber 321 enters the deposition chamber 82 through the outlet pipe below the collection plate 323. Most of the solid components are trapped by the elastic filter layer 84, while the liquid components pass through the elastic filter layer 84 and flow out along the flow gaps on the side wall of the deposition chamber 82 and the gaps between the support ribs 813.
[0097] To facilitate installation operations in the lower chamber 322, an operating port 34 is provided on the side wall of the lower chamber 322, allowing the operator to easily reach in and perform operations such as installing, placing, removing, and connecting pipelines to the sedimentation chamber 82. Several support columns can also be formed on the side wall of the lower chamber 322, with sufficiently large operating gaps between the columns to facilitate operator access.
[0098] The circulation component 4 employs a fluid transfer pump connected to the fluid pipeline. The inlet of the fluid transfer pump is connected to the fourth mounting port 74 on the base component 7. The outlet of the fluid transfer pump is connected to the storage component 1 via a water injection pipe. Furthermore, the return water pipe 2 is connected to the filling component 3. Driven by the fluid transfer pump, the solid-liquid mixture circulates between the storage component 1 and the filling component 3, continuously depositing onto the porous implant in the container 8. The return water pipe 2, connected to the filling component 3, is made of transparent material. After the solid-liquid mixture circulates for a certain period, the water passing through the return water pipe 2 becomes transparent, indicating that most of the solid components have deposited onto the porous implant, at which point the fluid transfer pump can be stopped. The transparent return water pipe allows for real-time monitoring of water quality changes. When the light transmittance is >95%, circulation is stopped to prevent overfilling. This can be achieved through manual visual inspection or monitoring using optical sensors, ensuring accurate equipment operation.
[0099] The storage assembly 1, filling assembly 3, and circulation assembly 4 are all mounted on the base assembly 7. The upper surface of the base assembly 7 has mounting ports for mounting the storage assembly 1, filling assembly 3, and circulation assembly 4. Fluid channels are machined within the base assembly 7, including a return water channel 77 and a drain channel 78. The return water channel connects to the first mounting port 71 and the second mounting port 72. The ports of the return water channel are sealed with plugs, which can be removed when cleaning the inside of the fluid channel. The drain channel connects to the third mounting port 73 and the fourth mounting port 74. The ports of the drain channel are also sealed with plugs, which can be removed when cleaning the inside of the fluid channel. The drain channel also connects to a fifth mounting port 75 for connecting to a negative pressure drainage assembly. A drain valve 76 is provided between the fourth mounting port 74 and the fifth mounting port 75 of the drain channel. During circulation filling, the drain valve 76 is closed; after filling is complete, the drain valve 76 can be opened for negative pressure drainage.
[0100] After installing the storage component 1, filling component 3, and circulation component 4 on the base component 7, a water inlet pipe is connected between the cylinder cover of the storage component 1 and the outlet of the circulation component 4, and a return water pipe 2 is connected between the second mounting port 72 and the cylinder cover of the filling component 3, thus forming a complete circulation pipeline. The return water pipe 2 from the second mounting port 72 to the cylinder cover of the filling component 3 consists of a vertical section and a horizontal section. The height H1 of the storage component 1 > the height H2 of the horizontal section of the return water pipe 2 > the height H3 of the filling component 3, thus forming a U-shaped pipe in the return water pipe 2 between the storage component 1 and the filling component 3.
[0101] The return water pipe 2, configured as a U-shaped pipe, serves the following functions:
[0102] First, only the crushed filler granules are placed in the storage component 1, and a certain amount of liquid is injected only into the upper cavity of the filling component 3. The storage component 1 and the filling component 3 serve as separate spaces for the filler and flow-carrying components, facilitating user operation and material metering.
[0103] During fluid circulation, the return water pipe 2 of the U-shaped pipe downstream of the storage component 1 maintains a high water level within the storage component 1, facilitating thorough solid-liquid mixing. The filler slurry only enters the filling component 3 after passing through the horizontal section of the return water pipe 2. At this point, the storage component 1 retains most of its liquid volume, while the filling component 3 contains only a small portion of the liquid.
[0104] Once filling is complete and circulation component 4 is stopped, only a small portion of the liquid remains in filling component 3. This small portion of retained liquid is easily drained under negative pressure, facilitating operation and saving dehydration time. The majority of the liquid in storage component 1 can be directly poured out.
[0105] The negative pressure drainage assembly is activated when the water in the return water pipe 2 becomes transparent, using negative pressure to drain the water. The assembly includes a storage tank 5 and a vacuum device (not shown in the figure). Two pipes extend from the storage tank 5, connecting to the fifth mounting port 75 on the base assembly 7 and the vacuum device, respectively. After the vacuum device is activated, a negative pressure environment is created in the storage tank 5, draining excess liquid from the filling component 3 into the storage tank 5 through the pipes. After a certain period of time, once the liquid in the filling component 3, especially the liquid in the container 8, has been fully drained, the vacuum device can be stopped. At this point, material has deposited on the porous implant in the container 8, and after sufficient dehydration and drying, the material can be removed for use during the procedure.
[0106] In practical applications
[0107] 1) The porous implant is installed in the container 8, and the container 8 is placed in the lower chamber of the filling component 3 for tubing connection.
[0108] 2) Place the appropriate amount of pretreated material into the storage component 1 and tighten the storage cover.
[0109] 3) Inject sufficient liquid into the upper chamber of filling component 3 and tighten the filling cap.
[0110] 4) Start the circulation component 4. After the liquid enters the storage component 1 through the water injection pipe, it forms a filling slurry. After being filtered through multiple stages, it flows into the filling component 3 through the return water pipe 2.
[0111] 5) After passing through the buffer mesh layer 33 and the collection plate 323 within the filling component 3, the material enters the container 8 and passes through the porous implant in the container 8. Material particles are deposited and attached to the porous implant.
[0112] 6) The filling slurry circulates repeatedly in the closed pipeline. When the liquid in the outlet pipe becomes transparent, the circulation component 4 can be stopped.
[0113] 7) Open the valve on the drainage channel, open the filling cover, and start the negative pressure drainage assembly to drain the liquid retained in the upper chamber of the filling assembly 3 and the container 8 under negative pressure. When the liquid level in the negative pressure drainage tank no longer rises, stop the negative pressure drainage assembly.
[0114] 8) Remove the container 8, open the upper sealing connector 83, and remove the porous implant filled with material for use during the operation.
[0115] Finally, it should be noted that the above description is merely an explanation of this utility model and is not intended to limit it. Although this utility model has been described in detail, those skilled in the art can still modify the foregoing technical solutions or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A closed-loop filling system for porous implants, comprising a storage assembly, a filling assembly, a circulation assembly, and a base assembly, characterized in that, The upper surface of the base assembly has multiple mounting holes for mounting the storage assembly, filling assembly and circulation assembly, respectively. The storage component is connected to the first mounting port on the base component via the bottom interface; The filling component includes a container in which a porous implant is placed; The bottom interface of the container connects to the third mounting port on the base assembly; The circulation component inlet is connected to the fourth mounting port on the base component; The return water pipe is connected to the second mounting port on the base assembly via one end interface, and the other end is connected to the filling assembly; The outlet of the circulation component is connected to the water injection pipe, which is then connected to the storage component.
2. The closed-loop filling system for porous implants according to claim 1, characterized in that, The mounting ports of the base assembly use threaded connections or quick-connect interfaces.
3. The closed-loop filling system for porous implants according to claim 1, characterized in that, The base assembly has fluid channels machined inside, including return water channels and drainage channels; The return water channels are connected to the first installation port and the second installation port respectively; The drainage channels are connected to the third and fourth installation ports respectively.
4. The closed-loop filling system for porous implants according to claim 1, characterized in that, The container consists of several components, including a lower filter assembly, a middle sedimentation chamber, and an upper sealing joint.
5. The closed-loop filling system for porous implants according to claim 4, characterized in that, The lower filter assembly is formed by the interlocking of the upper and lower components, with a filter element placed in the middle; The upper and lower components interlock to form an integrated filter assembly, which is placed in the third mounting port on the base assembly.
6. The closed-loop filling system for porous implants according to claim 5, characterized in that, The sedimentation chamber in the middle is installed in the third mounting port via a threaded connection or quick-connect connection, and the filter assembly in the third mounting port is positioned at the same time.
7. The closed-loop filling system for porous implants according to claim 6, characterized in that, The upper surface of the upper component also has a support recess, and multiple support ribs are formed in the support recess; A porous implant is placed in the deposition chamber, and an elastic filter layer is wrapped around the outside of the porous implant before it is fixed and positioned using support ribs.
8. The closed-loop filling system for porous implants according to claim 7, characterized in that, The upper sealing connector presses against the tail end of the porous implant to secure it; the sealing connector is connected to the fluid lines in the filling assembly using a flexible hose.
9. The closed-loop filling system for porous implants according to claim 1, characterized in that, The filling assembly includes an upper chamber and a lower chamber. The container is located in the lower chamber, and a buffer mesh layer and a liquid collection plate are formed in the upper chamber to guide the fluid.
10. The closed-loop filling system for porous implants according to claim 1, characterized in that, The storage assembly is equipped with a multi-stage filter, which includes multiple filtration sections, each with a different filtration mesh size.