A bone cement mixing device

Abstract

This invention pertains to the field of bone cement, specifically a bone cement mixing device. Addressing the problem that existing devices cannot break the laminar flow and local concentration gradients during the mixing process, leading to low mixing efficiency, difficulty in removing air bubbles, and uneven strength after bone cement curing, the following solution is proposed: The device includes a cylinder with a detachable threaded cap at its top. A first mixing component is mounted on the cap, used for clockwise mixing of the bone cement within the cylinder. A second mixing component is also mounted on the first mixing component, used for counter-clockwise mixing of the bone cement within the cylinder. This invention achieves bidirectional synchronous mixing under a single power source by combining the two mixing components, forming a three-dimensional shear flow field. This shortens the mixing time, reduces the risk of residual air bubbles, and improves the mixing uniformity of the bone cement powder and liquid, thereby optimizing the curing strength and handling performance of the bone cement.

Description

Technical Field

[0001] This utility model relates to the field of bone cement technology, and in particular to a bone cement mixing device. Background Technology

[0002] Bone cement is a medical material used in orthopedic surgery. Its scientific name is polymethyl methacrylate (PMMA), which consists of two parts: powder and liquid monomer. Its physical properties after curing are similar to those of building cement, but its composition and uses are completely different. Bone cement is not traditional cement, but a high-molecular synthetic material with characteristics such as rapid curing, good adhesion and biocompatibility.

[0003] Currently, existing bone cement mixing devices typically employ a unidirectional mixing structure. While this can achieve basic mixing of powder and liquid, it cannot create a multidimensional shear force field to break the laminar flow state and local concentration gradient during the mixing process. This results in low mixing efficiency, undispersed clumps remaining in the mixing blind zone, and air bubbles easily becoming trapped in the unidirectional vortex and difficult to expel. Ultimately, this leads to uneven strength of the bone cement after curing, prolonged operating time, and curing defects. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as the inability to break the laminar flow state and local concentration gradient during the mixing process, which leads to low mixing efficiency, difficulty in removing air bubbles, and uneven strength after bone cement curing. Therefore, this invention proposes a bone cement mixing device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A bone cement mixing apparatus, comprising:

[0007] A cylindrical body, the top of which is detachably threadedly connected to a cap;

[0008] The cylinder cover is provided with a stirring component one, which is used to stir the bone cement in the cylinder in a clockwise direction. The stirring component one is also provided with a stirring component two, which is used to stir the bone cement in the cylinder in a counterclockwise direction.

[0009] In one possible design, the stirring assembly includes a rotating rod that is rotatably disposed at the center of the cylinder cover. Two stirring blades are longitudinally fixed at one end of the rotating rod located inside the cylinder. A crank handle is fixedly disposed at the other end of the rotating rod located outside the cylinder cover. A gear is fixedly disposed on the outside of the rotating rod located above the cylinder cover and below the crank handle.

[0010] In one possible design, the stirring assembly two includes a sleeve rotatably mounted outside the rotating rod via a bearing. A connecting frame is fixedly mounted at the bottom end of the sleeve. Two stirring blades two are longitudinally fixedly mounted on both sides of the inner wall of the connecting frame. The stirring blades two and stirring blade one are staggered. An internal gear ring is fixedly mounted at the top of the sleeve. A rotating shaft is rotatably mounted through the sleeve next to the rotating rod. A gear one is fixedly mounted at the bottom end of the rotating shaft. The gear one meshes with the internal gear ring for transmission. A gear two is fixedly mounted at the top end of the rotating shaft. The gear two meshes with a gear three for transmission.

[0011] In one possible design, the bottom of the cylinder has a discharge port, and the bottom of the cylinder can be detached from the threaded connection of a plugging head that seals the discharge port.

[0012] In one possible design, the sleeve is externally rotatable with a piston.

[0013] In one possible design, scrapers are fixedly installed on both sides of the connecting frame, and both scrapers are in contact with the inner wall of the cylinder.

[0014] In one possible design, a handle is fixedly provided on one side of the cylinder.

[0015] In this application, when starting to use the equipment, the sealing head is first screwed into the bottom outlet of the cylinder through the thread to ensure sealing and prevent material leakage during the mixing process. Then, the bone cement powder and liquid monomer are poured into the cylinder according to the ratio. The cylinder cover and the mixing component on it are pre-assembled. Then, the cylinder cover is picked up and the mixing component is vertically inserted into the cylinder. During the insertion process, the piston is pressed down along the cylinder wall to push the attached material into the mixing area. After the cylinder cover is inserted into place, it is rotated and tightened with the thread on the top of the cylinder to form a closed mixing chamber.

[0016] Then, hold the handle on the side of the cylinder with one hand to keep the device stable, and rotate the crank handle clockwise with the other hand. As the crank handle rotates, it drives the rotating rod to rotate. As the rotating rod rotates, it drives the two sets of stirring blades on it to stir the bone cement powder and liquid in the cylinder clockwise. During the rotation of the rotating rod, the third gear on it will rotate synchronously. When the third gear rotates, it will drive the second gear meshing with it to rotate in the opposite direction. When the second gear rotates in the opposite direction, it will drive the first gear at its bottom to rotate synchronously through the rotating shaft. At the same time, the rotation of the first gear will drive the internal gear ring meshing with it to rotate. The rotation of the internal gear ring will drive the sleeve and the two sets of stirring blades on it to rotate counterclockwise outside the rotating rod. Since the first and second stirring blades are staggered, bidirectional shear force will be generated during stirring, which will efficiently mix the materials.

[0017] This utility model has the following beneficial effects:

[0018] In this invention, the mixing component 1 can be used to stir the bone cement clockwise, which promotes the bone cement powder and liquid to form an axial circulation along the central area of ​​the cylinder, initially breaking the stratification of the raw materials and accelerating molecular diffusion.

[0019] In this invention, the mixing component two allows for counterclockwise mixing of the bone cement, eliminating localized eddy current dead zones, laminar flow effects, and mixing blind spots caused by clockwise mixing, thereby maximizing the efficiency of the composite mixing process.

[0020] This invention achieves bidirectional synchronous mixing under a single power source by combining two mixing components, forming a three-dimensional shear flow field. This reduces the risk of residual air bubbles while shortening the mixing time, and improves the mixing uniformity of bone cement powder and liquid, thereby optimizing the curing strength and handling performance of bone cement. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a bone cement mixing device proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of the overall disassembled structure of a bone cement mixing device proposed in this utility model;

[0023] Figure 3 This is a schematic diagram of the disassembled structure of the mixing component of a bone cement mixing device proposed in this utility model;

[0024] Figure 4 This is an enlarged structural diagram of part A of a bone cement mixing device proposed in this utility model.

[0025] In the diagram: 1. Cylinder body; 2. Handle; 3. Cylinder cover; 4. Rotating rod; 5. Stirring blade one; 6. Crank handle; 7. Sleeve; 8. Connecting frame; 9. Stirring blade two; 10. Internal gear ring; 11. Rotating shaft; 12. Gear one; 13. Gear two; 14. Gear three; 15. Piston; 16. Scraper; 17. Sealing head. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Example 1

[0028] Reference Figure 1-4 A stirring device, comprising:

[0029] The cylinder body 1 has a threaded groove on the outer ring of its top, and the cylinder cover 3 has an internal threaded tooth on its inner ring. The cylinder cover 3 is detachably threaded to the threaded groove on the outer ring of the top of the cylinder body 1 through the internal threaded tooth, so as to facilitate the feeding operation.

[0030] A stirring assembly is installed on the cylinder cover 3. The stirring assembly includes a rotating rod 4, which passes through the center of the cylinder cover 3 and can rotate freely on it. Two stirring blades 5 are longitudinally fixedly connected to one end of the rotating rod 4 inside the cylinder body 1. The stirring blades 5 are designed in the shape of inclined plates and are used to stir the bone cement in the cylinder body 1 clockwise. A crank handle 6 is fixedly connected to one end of the rotating rod 4 outside the cylinder cover 3. The rotating rod 4 can be driven to rotate clockwise by manually rotating the crank handle 6. A gear 14 is fixedly installed on the outside of the rotating rod 4 above the cylinder cover 3 and below the crank handle 6. The gear 14 is used to transmit power to the stirring assembly 2.

[0031] The second stirring assembly is mounted on the first stirring assembly. Specifically, it includes a sleeve 7 that is rotatably mounted outside the rotating rod 4 via a bearing. A connecting frame 8 is fixedly connected to the bottom end of the sleeve 7. Two stirring blades 9 are longitudinally fixedly connected to both sides of the inner wall of the connecting frame 8. The stirring blades 9 and the first stirring blade 5 are staggered to form a bidirectional shearing force during stirring, thereby improving mixing efficiency. An internal gear ring 10 is fixedly connected to the top of the sleeve 7. A rotating shaft 11 is rotatably mounted through the sleeve 3 next to the rotating rod 4. A gear 12 is fixedly connected to the bottom end of the rotating shaft 11. The internal gear ring 10 meshes with the gear 12 for transmission. A gear 13 is fixedly connected to the top end of the rotating shaft 11. The gear 13 meshes with the gear 14 for transmission. When the rotating rod 4 rotates clockwise, the gear 14 rotates clockwise, which drives the gear 13 to rotate counterclockwise, thereby driving the rotating shaft 11 to rotate counterclockwise. Then, through the meshing of the gear 12 and the internal gear ring 10, the sleeve 7 and the stirring blades 9 on it rotate counterclockwise.

[0032] This application can be used in the field of bone cement mixing technology, or in other fields applicable to this application.

[0033] Example 2

[0034] Based on Embodiment 1, Embodiment 2 further includes: a bone cement mixing device, which is applied to the field of bone cement mixing technology. The bottom of the cylinder 1 is provided with a discharge port, and a plug head 17 is detachably threaded to the discharge port for sealing the discharge port during the mixing process to prevent bone cement leakage. After the mixing is completed, the plug head 17 can be unscrewed to discharge the mixed bone cement.

[0035] The sleeve 7 is equipped with a piston 15 that can rotate on the outside. The piston 15 can slide up and down along the inner wall of the cylinder 1. When the cylinder cover 3 is assembled with the mixing component and inserted into the cylinder 1, the piston 15 presses down along the cylinder wall and pushes the material attached to the cylinder wall into the mixing area to improve the material utilization rate. At the same time, the piston 15 also controls the powder and liquid of the bone cement to always be in the mixing area during the mixing process.

[0036] Scrapers 16 are fixedly connected to both sides of the connecting frame 8. Both scrapers 16 are in contact with the inner wall of the cylinder 1. During the mixing process, the scrapers 16 can rotate together with the mixing component 2 to scrape off the residual bone cement on the inner wall of the cylinder 1, preventing material waste and scaling on the inner wall of the cylinder 1.

[0037] A handle 2 is fixedly installed on one side of the cylinder 1, which allows the operator to hold the cylinder 1 with one hand to keep the device stable, while the other hand is used to rotate the crank 6 to perform the stirring operation.

[0038] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A bone cement mixing device, characterized in that, include: The top of the cylinder (1) is detachably threaded and has a cap (3). The cylinder cover (3) is provided with a stirring component one, which is used to stir the bone cement in the cylinder (1) clockwise. The stirring component one is also provided with a stirring component two, which is used to stir the bone cement in the cylinder (1) counterclockwise.

2. The bone cement mixing device according to claim 1, characterized in that, The stirring assembly includes a rotating rod (4) that is rotatably disposed at the center of the cylinder cover (3). Two stirring blades (5) are fixedly disposed longitudinally at one end of the rotating rod (4) located inside the cylinder (1). A crank handle (6) is fixedly disposed at one end of the rotating rod (4) located outside the cylinder cover (3). A gear (14) is fixedly disposed on the outside of the rotating rod (4) located above the cylinder cover (3) and below the crank handle (6).

3. The bone cement mixing device according to claim 2, characterized in that, The stirring assembly 2 includes a sleeve (7) rotatably mounted outside the rotating rod (4) via a bearing. A connecting frame (8) is fixedly mounted at the bottom end of the sleeve (7). Two stirring blades (9) are longitudinally fixed on both sides of the inner wall of the connecting frame (8). The stirring blades (9) and stirring blade (5) are staggered. An internal gear ring (10) is fixedly mounted at the top of the sleeve (7). A rotating shaft (11) is rotatably mounted through the cylinder cover (3) next to the rotating rod (4). A gear (12) is fixedly mounted at the bottom end of the rotating shaft (11). The gear (12) meshes with the internal gear ring (10). A gear (13) is fixedly mounted at the top end of the rotating shaft (11). The gear (13) meshes with the gear (14).

4. The bone cement mixing device according to claim 1, characterized in that, The bottom of the cylinder (1) is provided with a discharge port, and the bottom of the cylinder (1) can be detached from the threaded connection of a plug head (17) to block the discharge port.

5. A bone cement mixing device according to claim 3, characterized in that, The sleeve (7) is provided with a piston (15) for external rotation.

6. A bone cement mixing device according to claim 5, characterized in that, Scrapers (16) are fixedly installed on both sides of the connecting frame (8), and both scrapers (16) are in contact with the inner wall of the cylinder (1).

7. A bone cement mixing device according to claim 1, characterized in that, A handle (2) is fixedly provided on one side of the cylinder (1).

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