Digital 3D printing bone forming manufacturing process for clinical bone grafting operation

Abstract

The invention relates to the field of plastic material forming, in particular to a clinical bone grafting operation digital 3D printing bone forming manufacturing process which comprises the following steps: S1, receiving clinical CBCT data, importing CBCT jaw bone data, and adjusting a CBCT threshold value; s2, two CBCT jaw bone original files are imported; s3, adding and subtracting the reconstruction part of the jaw bone; s4, opening Magics software, and importing an original file of the jaw bone and a reconstructed model of the jaw bone; s5, storing the remaining reconstruction part in a file, and trimming; s6, opening Magics software, and newly building a square box; s7, dividing the hollowed-out box into two parts by utilizing a software division function; and S8, printing the template into a finished product by using a printer. S9, disinfecting the template; and S10, taking out the bone meal, mixing the bone meal with the mucus to form a blocky body, placing the blocky body into a disinfected template, placing the template into a vacuum bag, and compacting the template by using the vacuum bag. The purpose of the invention is to effectively guarantee the forming quality of the composite bone grafting material.

Description

Technical Field

[0001] The present application relates to the field of plastic material forming, and in particular to a digital 3D printing bone forming manufacturing process for clinical bone grafting surgery. Background Art

[0002] With the promotion of oral implant technology, dental implants are widely used in patients with various edentulous and missing teeth. However, severe periodontitis, trauma, long-term tooth loss or failed implants can cause horizontal and vertical three-dimensional bone defects in the alveolar ridge. It is very challenging to reconstruct such severe bone defects and obtain long-term stable aesthetic effects. Due to the limited amount of autologous bone in the oral cavity, it is often necessary to restore bone defects through guided bone regeneration technology combined with bone transplant materials. Among them, the composite bone graft material adhesive bone is composed of bone powder, growth factors and autologous fibrin, which has strong operability and stable structure. At the same time, the autologous fibrin network inside the material can prevent the migration of soft tissue cells, promote the recruitment of osteoblasts, reduce bone loss in the surgical area and accelerate bone tissue healing.

[0003] In the related art, the specific process of making the composite bone graft material is: take out the bone powder, then mix the bone powder and mucus to form a block, place the block formed by mixing the bone powder and mucus into a two-part sterilized template, and then press the two parts of the template against each other. After the block is extruded and formed in the two parts of the template, the two parts of the template are opened, and the viscous bone (composite bone graft material) is completely formed, and it can be taken out for inspection and standby.

[0004] In the actual production process, due to the presence of gas inside the block formed by mixing bone powder and mucus, when the two parts of the template are extruding the block, the gas is affected, resulting in incomplete filling inside the adhesive bone after it is extruded, causing a certain degree of "honeycomb pockmarks" inside the adhesive bone, which will affect the molding quality of the adhesive bone, shorten the service life of the adhesive bone, and is not conducive to long-term use by patients. Summary of the invention

[0005] The present application provides a digital 3D printing bone forming production process for clinical bone grafting surgery, the purpose of which is to effectively avoid the phenomenon of incomplete filling inside the composite bone grafting material after molding due to gas between blocks formed after the mixture of bone powder and mucus during the process of manufacturing composite bone grafting materials, thereby effectively preventing the appearance of "honeycomb roughness" inside the molded viscous bone, which is beneficial to ensuring the molding quality of the viscous bone and extending the service life of the viscous bone.

[0006] The present application provides a digital 3D printing bone shaping manufacturing process for clinical bone grafting surgery, which adopts the following technical solution: comprising the following steps: S1, receiving clinical CBCT data, importing CBCT jaw data, and adjusting the appropriate CBCT threshold value; S2, two original jaw files imported from CBCT, one for comparison and the other for designing jaw reconstruction model; S3, add or subtract the part of the jaw that needs to be reconstructed; S4. Open Magics software and import the original file of the jaw and the reconstructed model of the jaw; S5. Save the remaining reconstructed part as a file and import it into exocad software again for final finishing. S6. Open Magics software again, create a new box that is larger than the reconstructed part of the jaw, move the reconstructed part to the middle of the box, adjust the direction, and use Boolean operation to remove the reconstructed part in the box. At this time, the box has been hollowed out according to the reconstructed part. S7. Use the software segmentation function to divide the hollow box into two parts; S8, using a printer to print the template into a finished product; S9. Before operating the finished template, disinfect the template with iodine first, and then perform the block forming operation in a sterile operating room; S10. Take out the bone powder, mix it with mucus to form a block, place the block in a sterilized template, and then put the template into a vacuum bag. Use the vacuum bag to compact the template with relative force. After opening, the sticky bone is completely formed and taken out for inspection and use.

[0007] By adopting the above technical solution and using digital technology for personalized design, the guide plate has a simple structure, reasonable design, higher personalized fit, shorter operation time, and adjustable shape. It is easy to use, improves the controllability and predictability of bone grafting, reduces the operation time and error, reduces the difficulty of the operation, avoids complications such as poor postoperative healing due to the movement of bone powder / blocks, or excessive swelling due to prolonged operation time, and improves the success rate of the operation.

[0008] This method can also be combined with other technologies (such as titanium mesh, absorbable / non-absorbable membranes) to perform complex bone grafting, protect the compensatory absorption of autologous bone or bone powder materials, and also reduce the amount of bone required for bone grafting, thereby obtaining greater bone increment benefits.

[0009] Preferably, an exhaust hole is provided on the vacuum bag, an air pump is installed on the exhaust hole, the template includes a first pressing block and a second pressing block, a first molding cavity is provided on a side of the first pressing block close to the second pressing block, a second molding cavity is provided on a side of the second pressing block close to the first pressing block, and an overflow hole is provided on the inner wall of the second molding cavity running through it in a vertical direction.

[0010] By adopting the above technical solution, the block formed by mixing bone powder and mucus is placed in the second molding cavity, and the air pump is turned on. The air pump gradually evacuates the air in the vacuum bag through the air extraction holes. In this process, negative pressure is gradually formed in the vacuum bag, and the gas inside the block formed by mixing bone powder and mucus will gradually be extracted from the inside of the block into the vacuum bag, and then discharged to the outside of the vacuum bag through the air extraction holes on the vacuum bag. This allows the gas inside the block to be exhausted, and can effectively avoid the phenomenon of incomplete filling of the composite bone graft material after molding due to the gas between the blocks formed by mixing bone powder and mucus, and can effectively prevent the appearance of "honeycomb pockmarks" inside the molded viscous bone, which is beneficial to ensuring the molding quality of the viscous bone and extending the service life of the viscous bone.

[0011] At the same time, as the air pump extracts the air in the vacuum bag, negative pressure gradually forms in the vacuum bag, and the vacuum bag gradually shrinks. In the process of gradual shrinkage, the vacuum bag squeezes the first pressing block and the second pressing block, so that the first pressing block and the second pressing block move towards each other. In the process of mutual squeezing of the first pressing block and the second pressing block, a block formed by mixing bone powder and mucus is squeezed and formed in the first molding cavity and the second molding cavity. In the process of squeezing the blocks by the first molding cavity and the second molding cavity, excess blocks are discharged from the overflow hole.

[0012] This setting method uses a vacuum bag and an air pump to extract the air in the vacuum bag so that negative pressure is gradually formed in the vacuum bag. There are two effects: first, it effectively ensures that the gas inside the block formed by the mixture of bone powder and mucus is smoothly extracted, and then it can effectively prevent the appearance of "honeycomb surface" inside the formed viscous bone, which is beneficial to ensure the molding quality of the viscous bone and extend the service life of the viscous bone; second, the contraction of the vacuum bag is used to squeeze the first pressing block and the second pressing block, so that the first pressing block and the second pressing block move in a direction close to each other. In the process of mutual squeezing of the first pressing block and the second pressing block, the block formed by the mixture of bone powder and mucus is squeezed and formed in the first molding cavity and the second molding cavity.

[0013] Then, in the process of extracting the gas inside the block by using the vacuum bag, the first pressing block and the second pressing block are squeezed towards each other at the same time. The two steps are performed simultaneously, which can effectively improve the quality and efficiency of the viscous bone forming.

[0014] Preferably, a plurality of guide rods are integrally formed along the vertical direction on a side of the first pressing block close to the second pressing block, and a plurality of guide holes are integrally opened along the vertical direction on a side of the second pressing block close to the first pressing block, the plurality of guide rods and the plurality of guide holes correspond one to one, and one end of the guide rod away from the first pressing block is inserted into the corresponding guide hole.

[0015] By adopting the above technical solution, the vacuum bag guides the first and second pressing blocks by using the guide rods and guide holes during the process of squeezing the first and second pressing blocks. The purpose of this is to limit the first and second pressing blocks by the corresponding guide rods and guide holes, thereby effectively avoiding the first and second pressing blocks from being offset during the process of squeezing the first and second pressing blocks by the vacuum bag, thereby ensuring that the first and second pressing blocks are squeezed more accurately on the block body, and improving the molding quality of the viscous bone.

[0016] Preferably, an auxiliary spring is installed in the guide hole along the vertical direction, and the end of the auxiliary spring extends upward from the guide hole and is connected to the corresponding bottom of the guide rod.

[0017] By adopting the above technical solution, when the air pump is turned on to extract the air in the vacuum bag, the first pressing block and the second pressing block are gradually squeezed. In this process, in order to effectively ensure that the gas in the block is completely extracted, the first pressing block and the second pressing block cannot be squeezed too quickly, otherwise the gas in the block has not been completely extracted, and the first pressing block and the second pressing block are attached to each other, and the gas in the block can no longer be further extracted, which will still affect the subsequent molding quality of the adhesive bone.

[0018] The auxiliary spring is supported between the first pressure block and the second pressure block. When the first pressure block and the second pressure block gradually approach each other, the auxiliary spring relies on its own elasticity to buffer the approach of the first pressure block and the second pressure block, which is beneficial to prolong the time for the gas inside the block to be extracted and improve the subsequent molding quality of the viscous bone.

[0019] Preferably, both left and right ends of the first pressing block close to the second pressing block are integrally formed with toothed portions, and both left and right ends of the second pressing block close to the first pressing block are integrally formed with toothed portions, and the toothed portions are connected with the corresponding toothed portions by snapping.

[0020] By adopting the above technical solution, the tooth portion and the tooth groove portion are utilized to further prevent the first pressing block and the second pressing block from shifting in position after being squeezed together, thereby further ensuring the quality of the viscous bone forming.

[0021] Preferably, two cutting plates are added inside the second pressing block, and the two cutting plates are located on the side away from the two overflow holes and close to the top of the overflow hole. The cutting plates are horizontally arranged and slidably installed in the second pressing block along the horizontal direction. After the viscous bone in the first molding cavity and the second molding cavity is extruded and molded, the cutting plates will cut off the viscous bone molded in the first molding cavity, the second molding cavity and the excess viscous bone in the overflow hole.

[0022] By adopting the above technical solution, during the extrusion molding process of the adhesive bone, the excess aggregate will be squeezed into the overflow hole. This makes the adhesive bone in the first molding cavity and the second molding cavity connected to the excess adhesive bone in the overflow hole during the extrusion process. When the molded adhesive bone is dried and taken out in the drying equipment, the excess adhesive bone in the overflow hole will also be dried and molded together, which requires cutting these excess adhesive bones. However, since the adhesive bone has been dried at this time and has a certain hardness, it is difficult to separate the excess adhesive bone from the adhesive bone required by the patient. This increases the difficulty of cutting the excess adhesive bone, and it is easy to cut the required adhesive bone together in the process of cutting the excess adhesive bone.

[0023] The excess adhesive bone in the overflow hole and the adhesive bone formed in the first molding cavity and the second molding cavity are cut off by using a cutting plate. The purpose of doing this is to cut off the adhesive bone needed by the patient formed in the first molding cavity and the second molding cavity and the excess adhesive bone in the overflow hole before the adhesive bone is dried. This makes it necessary to dry only the adhesive bone needed by the patient, and no further cutting is required after drying, which helps to reduce the difficulty of the overall production of the adhesive bone.

[0024] Preferably, two sets of driving components are additionally provided in the second pressing block, the two driving components respectively correspond to the two cutting plates, and the driving components are used to drive the corresponding cutting plates to slide in the second pressing block.

[0025] By adopting the above technical solution, the driving component is used to drive the cutting plate to cut the excess sticky bone in the overflow hole.

[0026] Preferably, a mounting cavity is provided in the second pressing block, the driving assembly and the cutting plate are both located in the mounting cavity, and the driving assembly includes a rack, a gear, a rotating shaft and a cam; The gear is vertically arranged in the mounting cavity, the second pressure block is provided with a slide rail which is connected to the mounting cavity, and the slide rail has an "L"-shaped structure as a whole, the side wall of the rack is integrally formed with a connecting plate in the horizontal direction, the connecting plate is located in the slide rail, the first pressure block is integrally formed with a lower pressure plate in the vertical direction on one side close to the second pressure block, the position of the lower pressure plate corresponds to the slide rail, a return spring is vertically installed between the bottom of the rack and the bottom of the mounting cavity, the gear is meshed with the rack, the end of the rotating shaft is connected to the inner wall of the mounting cavity through a bearing seat, the gear is integrally sleeved on the rotating shaft, and the end of the rotating shaft away from the gear is integrally connected to the axis of the cam, the second pressure block is horizontally provided with a slide groove for the cutting plate to slide, the slide groove is connected to the overflow hole, and the cam is used to drive the cutting plate to slide in the slide groove.

[0027] By adopting the above technical solution, specifically, during the downward movement of the first pressing block, the lower pressing plate is synchronously driven to move downward into the slide rail, and the lower pressing plate extends into the slide rail to press down the connecting plate. When the connecting plate moves downward, the rack is synchronously driven to move downward. During the downward movement, the rack meshes with the gear, thereby driving the gear to rotate. During the rotation of the gear, the shaft is driven to rotate, and the shaft drives the cam to rotate. During the rotation of the cam, when the protrusion of the cam rotates to the cutting plate, the protrusion of the cam pushes the cutting plate to slide from the slide groove into the overflow hole, thereby completing the cutting of the excess sticky bone in the overflow hole.

[0028] Preferably, a roller is provided at one end of the cutting plate close to the cam, and the roller is mounted on the cutting plate through a corresponding fixing seat.

[0029] By adopting the above technical solution, when the protrusion on the cam rotates to the cutting plate, the roller can play a transition role between the cam and the cutting plate, and the connection between the roller and the cam is smoother to increase the stability of the cam pushing the cutting plate.

[0030] Preferably, a guide seat is provided on the peripheral side of the cutting plate, and the guide seat is used to guide the sliding of the cutting plate.

[0031] By adopting the above technical solution, the guide seat is used to guide the sliding of the cutting plate, which is beneficial to improve the stability of the cutting plate during the sliding process.

[0032] In summary, the present application includes at least one of the following beneficial technical effects: 1. Place the block formed by mixing bone powder and mucus into the second molding cavity, turn on the air pump, and gradually evacuate the air in the vacuum bag through the air pump holes. During this process, negative pressure is gradually formed in the vacuum bag, and the gas inside the block formed by mixing bone powder and mucus will gradually be extracted from the inside of the block into the vacuum bag, and then discharged to the outside of the vacuum bag through the air pump holes on the vacuum bag. This allows the gas inside the block to be exhausted, and can effectively avoid the phenomenon of incomplete filling of the composite bone graft material after molding due to the gas between the blocks formed by mixing bone powder and mucus, and can effectively prevent the appearance of "honeycomb pockmarks" inside the molded viscous bone, which is beneficial to ensuring the molding quality of the viscous bone and extending the service life of the viscous bone.

[0033] At the same time, as the air pump extracts the air in the vacuum bag, negative pressure gradually forms in the vacuum bag, and the vacuum bag gradually shrinks. In the process of gradual shrinkage, the vacuum bag squeezes the first pressing block and the second pressing block, so that the first pressing block and the second pressing block move towards each other. In the process of mutual squeezing of the first pressing block and the second pressing block, a block formed by mixing bone powder and mucus is squeezed and formed in the first molding cavity and the second molding cavity. In the process of squeezing the blocks by the first molding cavity and the second molding cavity, excess blocks are discharged from the overflow hole.

[0034] This setting method uses a vacuum bag and an air pump to extract the air in the vacuum bag so that negative pressure is gradually formed in the vacuum bag. There are two effects: first, it effectively ensures that the gas inside the block formed by the mixture of bone powder and mucus is smoothly extracted, and then it can effectively prevent the appearance of "honeycomb surface" inside the formed viscous bone, which is beneficial to ensure the molding quality of the viscous bone and extend the service life of the viscous bone; second, the contraction of the vacuum bag is used to squeeze the first pressing block and the second pressing block, so that the first pressing block and the second pressing block move in a direction close to each other. In the process of mutual squeezing of the first pressing block and the second pressing block, the block formed by the mixture of bone powder and mucus is squeezed and formed in the first molding cavity and the second molding cavity.

[0035] Then, in the process of extracting the gas inside the block by using the vacuum bag, the first pressing block and the second pressing block are pressed towards each other at the same time. The two steps are performed simultaneously, which can effectively improve the quality and efficiency of the viscous bone forming. 2. When the air pump is turned on to extract the air in the vacuum bag, the first pressing block and the second pressing block are gradually squeezed. In this process, in order to effectively ensure that the gas in the block is completely extracted, the first pressing block and the second pressing block cannot be squeezed too quickly, otherwise the gas in the block has not been completely extracted, and the first pressing block and the second pressing block are attached to each other, and the gas in the block can no longer be extracted, which will still affect the subsequent molding quality of the adhesive bone.

[0036] The auxiliary spring is supported between the first pressing block and the second pressing block. When the first pressing block and the second pressing block gradually approach each other, the auxiliary spring relies on its own elasticity to buffer the approach of the first pressing block and the second pressing block, thereby facilitating the extraction time of the gas inside the block and improving the subsequent molding quality of the viscous bone. 3. When the guide rod moves downward in the guide hole, it presses the rack downward, and the rack meshes with the gear during the downward movement, thereby driving the gear to rotate. When the gear rotates, it drives the shaft to rotate, and then drives the cam to rotate through the shaft. When the cam rotates, when the cam protrusion rotates to the cutting plate, the cam protrusion pushes the cutting plate from the slide groove into the overflow hole, completing the cutting of the excess sticky bone in the overflow hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application; Figure 2 It is a structural schematic diagram of the embodiment of the present application specifically showing the positional relationship between the first pressing block, the second pressing block, the first molding cavity, the overflow hole, the guide rod, the tooth portion, the tooth groove portion and the lower pressing plate; Figure 3 is a structural schematic diagram of an embodiment of the present application specifically showing the positional relationship between the second molding cavity, the guide hole, the auxiliary spring and the slide rail; Figure 4 It is a structural schematic diagram of the embodiment of the present application specifically showing the positional relationship between the cutting plate, the cam, the mounting cavity and the slide groove; Figure 5 This is a structural diagram showing the positional relationship of the rack, gear, rotating shaft, slide rail, return spring and connecting plate in the embodiment of the present application; Figure 6 It is a structural schematic diagram of an embodiment of the present application that specifically shows the positional relationship among the roller, the fixing seat and the guide seat.

[0038] Figure numerals: 1. vacuum bag; 2. exhaust hole; 3. air pump; 4. first pressure block; 5. second pressure block; 6. first molding cavity; 7. second molding cavity; 8. overflow hole; 9. guide rod; 10. guide hole; 11. auxiliary spring; 12. tooth portion; 13. tooth groove portion; 14. cutting plate; 15. drive assembly; 151. rack; 152. gear; 153. rotating shaft; 154. cam; 16. installation cavity; 17. slide rail; 18. reset spring; 19. slide groove; 20. roller; 21. fixed seat; 22. guide seat; 23. connecting plate; 24. lower pressure plate. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1 -Attached Figure 6 , further details of this application are given.

[0040] Example: The present application embodiment discloses a digital 3D printing bone shaping manufacturing process for clinical bone grafting surgery, comprising the following steps: S1. Receive clinical CBCT data, import CBCT jaw data, adjust the appropriate CBCT threshold value, convert it into the required stl three-dimensional data format, and save the original file of CBCT converted stl jaw file; S2, two original jaw files imported from CBCT, one for comparison and the other for designing jaw reconstruction model; S3. Use the software function to add or subtract the part of the jaw that needs to be reconstructed to achieve the required restoration standard, and save the restored jaw reconstruction model; S4. Open Magics software, import the original file of the jaw and the reconstructed model of the jaw, and use the Boolean operation in the software to remove the intersecting models. The remaining reconstructed part is the part that needs to be used to make the template; S5. Save the remaining reconstructed part as a file, import it into exocad software again for final trimming, and save the reconstructed part after the trimming is correct. S6. Open Magics software again, create a new box that is 1 to 5 mm larger than the volume of the jaw reconstruction part, move the reconstruction part to the middle of the box, adjust the direction, and use Boolean operation to remove the reconstruction part in the box. At this time, the box has been hollowed out according to the reconstruction part. S7. Use the software splitting function to divide the hollow box into two parts. In order to prevent the box from being unstable when pressing bone powder, use serrated lines to split the box. Then use the punching function to open the overflow hole. The template is complete. S8, using a printer to print the template into a finished product; S9. Before operating the finished template, disinfect the template with iodine first, and then perform the block forming operation in a sterile operating room; S10, take out the bone powder, mix it with mucus to form a block, place the block in a sterilized template, then put the template into a vacuum bag 1, use the vacuum bag 1 to compact the template relatively hard, after opening, the sticky bone is completely formed, take it out for inspection and use.

[0041] The use of digital technology for personalized design has a simple guide structure, reasonable design, higher personalized fit, shorter operation time, and adjustable shape. It is easy to use, improves controllability and predictability of bone grafting, reduces operation time and errors, reduces the difficulty of surgery, avoids complications such as poor postoperative healing due to movement of bone powder / blocks, or excessive swelling due to prolonged operation time, and improves the success rate of surgery.

[0042] Reference Figure 1 , Figure 2 as well as Figure 3 The vacuum bag 1 is hollow inside, and an exhaust hole 2 is provided on the vacuum bag 1. An air pump 3 is installed on the exhaust hole 2. When the air pump 3 is turned on, the air in the vacuum bag 1 is gradually evacuated through the exhaust hole 2, so that the inside of the vacuum bag 1 is in a vacuum state. The template includes a first pressing block 4 and a second pressing block 5. The first pressing block 4 and the second pressing block 5 are both rectangular as a whole. Both are arranged horizontally, and the first pressing block 4 is located above the second pressing block 5. A first molding cavity 6 is provided on the side of the first pressing block 4 close to the second pressing block 5, and a second molding cavity 7 is provided on the side of the second pressing block 5 close to the first pressing block 4. The first molding cavity 6 and the second molding cavity 7 are arranged opposite to each other. An overflow hole 8 is provided on the inner wall of the second molding cavity 7 in a vertical direction.

[0043] Specifically, the block formed by mixing bone powder and mucus is placed in the second molding cavity 7, and the air pump 3 is turned on. The air pump 3 gradually evacuates the air in the vacuum bag 1 through the air extraction hole 2. In this process, negative pressure is gradually formed in the vacuum bag 1, and the gas inside the block formed by mixing bone powder and mucus is gradually extracted from the inside of the block into the vacuum bag 1, and then discharged to the outside of the vacuum bag 1 through the air extraction hole 2 on the vacuum bag 1. This allows the gas inside the block to be exhausted, and can effectively avoid the phenomenon of incomplete filling inside the composite bone graft material after molding due to the gas between the blocks formed by mixing bone powder and mucus, and can effectively prevent the appearance of "honeycomb pockmarks" inside the molded viscous bone, which is beneficial to ensuring the molding quality of the viscous bone and extending the service life of the viscous bone.

[0044] At the same time, as the air pump 3 extracts the air in the vacuum bag 1, the vacuum bag 1 gradually shrinks as negative pressure gradually forms in the vacuum bag 1. In the process of gradual shrinkage, the vacuum bag 1 squeezes the first pressing block 4 and the second pressing block 5, so that the first pressing block 4 and the second pressing block 5 move toward each other. In the process of mutual squeezing of the first pressing block 4 and the second pressing block 5, the block formed by the mixture of bone powder and mucus is squeezed and formed in the first molding cavity 6 and the second molding cavity 7. In the process of squeezing the blocks by the first molding cavity 6 and the second molding cavity 7, the excess blocks are discharged from the overflow hole 8.

[0045] This arrangement, using the vacuum bag 1 and the air pump 3 to extract the air in the vacuum bag 1 so that negative pressure is gradually formed in the vacuum bag 1, has two effects: first, it effectively ensures that the gas inside the block formed by the mixture of bone powder and mucus is smoothly extracted, thereby effectively preventing the appearance of "honeycomb surface" inside the formed viscous bone, which is beneficial to ensuring the molding quality of the viscous bone and extending the service life of the viscous bone; second, it utilizes the contraction of the vacuum bag 1 to squeeze the first pressing block 4 and the second pressing block 5, so that the first pressing block 4 and the second pressing block 5 move toward each other. During the mutual squeezing of the first pressing block 4 and the second pressing block 5, the block formed by the mixture of bone powder and mucus is squeezed and formed in the first molding cavity 6 and the second molding cavity 7.

[0046] Furthermore, in the process of extracting the gas inside the block by using the vacuum bag 1, the first pressing block 4 and the second pressing block 5 are squeezed towards each other at the same time. The two steps are performed simultaneously, which can effectively improve the quality and efficiency of the viscous bone forming.

[0047] Further, refer to Figure 2 and Figure 3 A plurality of guide rods 9 are integrally formed along the vertical direction on one side of the first pressing block 4 close to the second pressing block 5, and a plurality of guide holes 10 are integrally opened along the vertical direction on one side of the second pressing block 5 close to the first pressing block 4. These guide rods 9 correspond to these guide holes 10 one by one, and one end of the guide rod 9 away from the first pressing block 4 is inserted into the corresponding guide hole 10.

[0048] The vacuum bag 1 guides the first pressing block 4 and the second pressing block 5 by means of the guide rod 9 and the guide hole 10 during the extrusion of the first pressing block 4 and the second pressing block 5. The purpose of this is to limit the first pressing block 4 and the second pressing block 5 by means of the corresponding guide rod 9 and the guide hole 10, thereby effectively avoiding the first pressing block 4 and the second pressing block 5 from being offset during the extrusion of the first pressing block 4 and the second pressing block 5 by the vacuum bag 1, thereby ensuring that the extrusion of the block by the first pressing block 4 and the second pressing block 5 is more accurate, and thus improving the molding quality of the viscous bone.

[0049] Further, refer to Figure 2 and Figure 3 An auxiliary spring 11 is installed in the guide hole 10 along the vertical direction, and the end of the auxiliary spring 11 extends upward out of the guide hole 10 and is connected to the bottom of the corresponding guide rod 9.

[0050] When the air pump 3 is turned on to extract the air in the vacuum bag 1, the first pressing block 4 and the second pressing block 5 are gradually squeezed. In this process, in order to effectively ensure that the gas in the block is completely extracted, the first pressing block 4 and the second pressing block 5 cannot be squeezed too fast, otherwise the gas in the block has not been completely extracted, and the first pressing block 4 and the second pressing block 5 are attached to each other, and the gas in the block can no longer be further extracted, which will still affect the subsequent molding quality of the adhesive bone.

[0051] The auxiliary spring 11 is supported between the first pressure block 4 and the second pressure block 5. When the first pressure block 4 and the second pressure block 5 gradually approach each other, the auxiliary spring 11 relies on its own elasticity to buffer the approach of the first pressure block 4 and the second pressure block 5, which is beneficial to prolong the time for the gas inside the block to be extracted and improve the subsequent molding quality of the viscous bone.

[0052] Further, refer to Figure 2 and Figure 3 The first pressing block 4 has teeth 12 formed integrally on both ends of the left and right sides close to the second pressing block 5, and the second pressing block 5 has teeth 13 formed integrally on both ends of the left and right sides close to the first pressing block 4. After the first pressing block 4 and the second pressing block 5 are squeezed together, the corresponding teeth 12 and teeth 13 are engaged with each other. The teeth 12 and teeth 13 are used to further prevent the first pressing block 4 and the second pressing block 5 from shifting in position after being squeezed together, thereby further ensuring the quality of the adhesive bone forming.

[0053] Further, refer to Figure 2 , Figure 3 as well as Figure 4 Two cutting plates 14 are added inside the second pressing block 5. The two cutting plates 14 are located on the side away from the two overflow holes 8 and close to the top of the overflow hole 8. The cutting plates 14 are horizontally arranged and are slidably installed in the second pressing block 5 along the horizontal direction. After the viscous bone in the first molding cavity 6 and the second molding cavity 7 is extruded and molded, the cutting plates 14 cut off the viscous bone molded in the first molding cavity 6, the second molding cavity 7 and the excess viscous bone in the overflow hole 8.

[0054] After the adhesive bone is extruded and formed in the first molding cavity 6 and the second molding cavity 7, the first pressing block 4 and the second pressing block 5 squeezed together are taken out of the vacuum bag 1 and placed in a corresponding drying device, and the formed adhesive bone is dried by the drying device. After the adhesive bone is dried to a certain structural strength, the adhesive bone is taken out for inspection and standby.

[0055] During the extrusion molding process of the adhesive bone, excess aggregate will be squeezed into the overflow hole 8. This means that during the extrusion process, the adhesive bone in the first molding cavity 6 and the second molding cavity 7 is connected to the excess adhesive bone in the overflow hole 8. When the molded adhesive bone is dried and taken out in the drying equipment, the excess adhesive bone in the overflow hole 8 will also be dried and molded together, which requires cutting of the excess adhesive bone. However, since the adhesive bone has been dried at this time and has a certain hardness, it is difficult to separate the excess adhesive bone from the adhesive bone required by the patient. This increases the difficulty of cutting the excess adhesive bone, and it is easy to cut the required adhesive bone together during the process of cutting the excess adhesive bone.

[0056] The cutting plate 14 is used to cut off the excess adhesive bone in the overflow hole 8 and the adhesive bone formed in the first molding cavity 6 and the second molding cavity 7. The purpose of this is to cut off the adhesive bone needed by the patient formed in the first molding cavity 6 and the second molding cavity 7 and the excess adhesive bone in the overflow hole 8 before the adhesive bone is dried. This makes it only necessary to dry the adhesive bone needed by the patient, and there is no need to cut it after drying, which is beneficial to reduce the difficulty of the overall production of the adhesive bone.

[0057] It should be noted here that although the cutting plate 14 is arranged at the top of the overflow hole 8, when the excess adhesive bone in the overflow hole 8 is cut off, the cutting plate 14 cannot completely remove it because the bottom of the second molding cavity 7 is in an arc shape. The cutting plate 14 is installed as close to the top of the overflow hole 8 as possible. After the cutting plate 14 cuts the excess adhesive bone in the overflow hole 8, a part of the excess adhesive bone will still remain at the bottom of the adhesive bone required by the patient in the first molding cavity 6 and the second molding cavity 7. However, compared with the excess adhesive bone in the entire overflow hole 8, this part of the residual adhesive bone is very small and can be quickly disposed of, so it will not affect the overall production of the adhesive bone.

[0058] Specifically, refer to Figure 4 and Figure 5 Two sets of driving components 15 are added in the second pressing block 5. The two driving components 15 correspond to the two cutting plates 14 respectively. The driving components 15 are used to drive the corresponding cutting plates 14 to slide in the second pressing block 5, so that the cutting plates 14 can cut the excess sticky bone in the overflow hole 8.

[0059] Specifically, refer to Figure 4 and Figure 5 The second pressing block 5 is provided with an installation cavity 16, and the driving assembly 15 and the cutting plate 14 are both located in the installation cavity 16. The driving assembly 15 includes a rack 151, a gear 152, a rotating shaft 153 and a cam 154.

[0060] Reference Figure 3 , Figure 4 as well as Figure 5 The rack 151 is slidably arranged in the installation cavity 16 along the vertical direction. The second pressing block 5 is provided with a slide rail 17 which is connected to the installation cavity 16. The slide rail 17 is an "L"-shaped structure. The side wall of the rack 151 is integrally formed with a connecting plate 23 along the horizontal direction. The connecting plate 23 is located in the slide rail 17. At the same time, referring to Figure 2 , Figure 3 as well as Figure 5 A lower pressing plate 24 is integrally formed on one side of the first pressing block 4 close to the second pressing block 5 in the vertical direction, and the position of the lower pressing plate 24 corresponds to the slide rail 17 on the second pressing block 5. A return spring 18 is installed between the bottom of the rack 151 and the bottom of the installation cavity 16 in the vertical direction.

[0061] The gear 152 is vertically arranged in the installation cavity 16, and the gear 152 is meshed with the rack 151. The end of the shaft 153 is connected to the inner wall of the installation cavity 16 through the bearing seat, the gear 152 is integrally sleeved on the shaft 153, and the end of the shaft 153 away from the gear 152 is integrally connected to the axis of the cam 154. Figure 4 The second pressing block 5 is provided with a sliding groove 19 for the cutting plate 14 to slide in the horizontal direction, and the sliding groove 19 is connected with the overflow hole 8. The cam 154 is used to drive the cutting plate 14 to slide in the sliding groove 19, so that when the cutting plate 14 slides from the sliding groove 19 into the overflow hole 8, the excess sticky bone in the overflow hole 8 is cut off.

[0062] Specifically, during the downward movement of the first pressing block 4, the lower pressing plate 24 is synchronously driven to move downward into the slide rail 17. The lower pressing plate 24 extends into the slide rail 17 to press down the connecting plate 23. When the connecting plate 23 moves downward, the rack 151 is synchronously driven to move downward. During the downward movement, the rack 151 meshes with the gear 152, thereby driving the gear 152 to rotate. During the rotation of the gear 152, the rotating shaft 153 is driven to rotate, and the cam 154 is driven to rotate through the rotating shaft 153. During the rotation of the cam 154, when the protrusion of the cam 154 rotates to the cutting plate 14, the protrusion of the cam 154 pushes the cutting plate 14 to slide from the slide groove 19 into the overflow hole 8, thereby completing the cutting of the excess sticky bone in the overflow hole 8.

[0063] Further, refer to Figure 4 , Figure 5 as well as Figure 6 A roller 20 is provided at one end of the cutting plate 14 near the cam 154, and the roller 20 is mounted on the cutting plate 14 through a corresponding fixing seat 21. When the protrusion on the cam 154 rotates to the cutting plate 14, the roller 20 can play a transition role between the cam 154 and the cutting plate 14, and the connection between the roller 20 and the cam 154 is smoother to increase the stability of the cam 154 pushing the cutting plate 14.

[0064] Further, refer to Figure 4 and Figure 6 A guide seat 22 is sleeved around the cutting plate 14. When the cutting plate 14 slides in the slide groove 19, the guide seat 22 guides the sliding of the cutting plate 14, which is beneficial to improve the stability of the cutting plate 14 during the sliding process.

[0065] The implementation principle of a digital 3D printing bone shaping manufacturing process for clinical bone grafting surgery in the present application embodiment is as follows: The use of the vacuum bag 1 and the air pump 3 to extract the air in the vacuum bag 1 so that negative pressure is gradually formed in the vacuum bag 1 has two effects: first, it effectively ensures that the gas inside the block formed by the mixture of bone powder and mucus is smoothly extracted, thereby effectively preventing the appearance of "honeycomb surface" inside the formed viscous bone, which is beneficial to ensuring the molding quality of the viscous bone and extending the service life of the viscous bone; second, the contraction of the vacuum bag 1 is used to squeeze the first pressing block 4 and the second pressing block 5, so that the first pressing block 4 and the second pressing block 5 move toward each other. During the mutual squeezing of the first pressing block 4 and the second pressing block 5, the block formed by the mixture of bone powder and mucus is squeezed and formed in the first molding cavity 6 and the second molding cavity 7.

[0066] Furthermore, in the process of extracting the gas inside the block by using the vacuum bag 1, the first pressing block 4 and the second pressing block 5 are squeezed towards each other at the same time. The two steps are performed simultaneously, which can effectively improve the quality and efficiency of the viscous bone forming.

[0067] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A digital 3D printing bone shaping process for clinical bone grafting surgery, characterized by: The following steps are included: S1, receiving clinical CBCT data, importing CBCT jaw data, and adjusting the appropriate CBCT threshold value; S2, two original jaw files imported from CBCT, one for comparison and the other for designing jaw reconstruction model; S3, add or subtract the part of the jaw that needs to be reconstructed; S4. Open Magics software and import the original file of the jaw and the reconstructed model of the jaw; S5. Save the remaining reconstructed part as a file and import it into exocad software again for final finishing. S6. Open Magics software again, create a new box that is larger than the reconstructed part of the jaw, move the reconstructed part to the middle of the box, adjust the direction, and use Boolean operation to remove the reconstructed part in the box. At this time, the box has been hollowed out according to the reconstructed part. S7. Use the software segmentation function to divide the hollow box into two parts; S8, using a printer to print the template into a finished product; S9. Before operating the finished template, disinfect the template with iodine first, and then perform the block forming operation in a sterile operating room; S10, taking out the bone powder, mixing it with mucus to form a block, placing the block in a sterilized template, and then placing the template in a vacuum bag (1). The template is pressed relatively hard using the vacuum bag (1). After opening, the sticky bone is completely formed and taken out for inspection and use.

2. According to claim 1, a digital 3D printing bone shaping process for clinical bone grafting surgery is characterized by: The vacuum bag (1) is provided with an exhaust hole (2), and an air pump (3) is installed on the exhaust hole (2). The template comprises a first pressing block (4) and a second pressing block (5). A first molding cavity (6) is provided on a side of the first pressing block (4) close to the second pressing block (5), and a second molding cavity (7) is provided on a side of the second pressing block (5) close to the first pressing block (4). An overflow hole (8) is provided on the inner wall of the second molding cavity (7) and penetrates in a vertical direction.

3. According to claim 2, a digital 3D printing bone shaping process for clinical bone grafting surgery is characterized by: A plurality of guide rods (9) are integrally formed along the vertical direction on one side of the first pressing block (4) close to the second pressing block (5), and a plurality of guide holes (10) are integrally opened along the vertical direction on one side of the second pressing block (5) close to the first pressing block (4). The plurality of guide rods (9) and the plurality of guide holes (10) correspond one to one, and one end of the guide rod (9) away from the first pressing block (4) is inserted into the corresponding guide hole (10).

4. A digital 3D printing bone shaping process for clinical bone grafting surgery according to claim 3, characterized in that: An auxiliary spring (11) is installed in the guide hole (10) along the vertical direction, and the end of the auxiliary spring (11) extends upward from the guide hole (10) and is connected to the bottom of the corresponding guide rod (9).

5. A digital 3D printing bone shaping process for clinical bone grafting surgery according to claim 4, characterized in that: The first pressing block (4) has teeth portions (12) integrally formed at both left and right ends of a side close to the second pressing block (5), and the second pressing block (5) has teeth portions (13) integrally formed at both left and right ends of a side close to the first pressing block (4), and the teeth portions (12) and the corresponding teeth portions (13) are connected by snapping.

6. A digital 3D printing bone shaping process for clinical bone grafting surgery according to claim 5, characterized in that: Two cutting plates (14) are provided inside the second pressing block (5). The two cutting plates (14) are located on the side of the two overflow holes (8) that are away from each other and close to the top of the overflow hole (8). The cutting plates (14) are arranged horizontally and are slidably installed in the second pressing block (5) along the horizontal direction. After the viscous bone in the first molding cavity (6) and the second molding cavity (7) is extruded and molded, the cutting plates (14) cut off the viscous bone molded in the first molding cavity (6) and the second molding cavity (7) and the excess viscous bone in the overflow hole (8).

7. A digital 3D printing bone shaping manufacturing process for clinical bone grafting surgery according to claim 6, characterized in that: Two sets of driving components (15) are additionally arranged in the second pressing block (5), and the two driving components (15) correspond to the two cutting plates (14) respectively. The driving components (15) are used to drive the corresponding cutting plates (14) to slide in the second pressing block (5).

8. A digital 3D printing bone shaping process for clinical bone grafting surgery according to claim 7, characterized in that: The second pressing block (5) is provided with an installation cavity (16), the driving assembly (15) and the cutting plate (14) are both located in the installation cavity (16), and the driving assembly (15) comprises a rack (151), a gear (152), a rotating shaft (153) and a cam (154); The rack (151) is slidably arranged in the installation cavity (16) along the vertical direction, and a slide rail (17) which is connected to the installation cavity (16) is provided on the second pressure block (5), and the slide rail (17) is an "L"-shaped structure as a whole. A connecting plate (23) is integrally formed on the side wall of the rack (151) along the horizontal direction, and the connecting plate (23) is located in the slide rail (17). A lower pressure plate (24) is integrally formed on the side of the first pressure block (4) close to the second pressure block (5) along the vertical direction, and the position of the lower pressure plate (24) corresponds to the slide rail (17). A return spring (18) is installed between the bottom of the rack (151) and the bottom of the installation cavity (16) along the vertical direction. The gear (152) is vertically arranged in the installation cavity (16), the gear (152) is meshed and connected with the rack (151), the end of the rotating shaft (153) is connected to the inner wall of the installation cavity (16) through a bearing seat, the gear (152) is integrally sleeved on the rotating shaft (153), and the end of the rotating shaft (153) away from the gear (152) is integrally connected to the axis of the cam (154), and the second pressing block (5) is provided with a sliding groove (19) in the horizontal direction for the cutting plate (14) to slide, and the sliding groove (19) is connected to the overflow hole (8), and the cam (154) is used to drive the cutting plate (14) to slide in the sliding groove (19).

9. A digital 3D printing bone shaping manufacturing process for clinical bone grafting surgery according to claim 8, characterized in that: A roller (20) is provided at one end of the cutting plate (14) close to the cam (154), and the roller (20) is mounted on the cutting plate (14) via a corresponding fixing seat (21).

10. A digital 3D printing bone shaping process for clinical bone grafting surgery according to claim 9, characterized in that: A guide seat (22) is sleeved on the peripheral side of the cutting plate (14), and the guide seat (22) is used to guide the sliding movement of the cutting plate (14).

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