A suction type bone cement mixer

Abstract

The utility model relates to medical instrument technical field especially is a kind of air-bleed formula bone cement mixer, including stirring container body, the upper part of stirring container body is movably installed with cover body subassembly, and the upper part and lower part of cover plate are fixedly installed with stirring subassembly, and stirring subassembly includes fixed handle, and fixed handle is fixedly installed on the upper surface of cover plate, protective shell is fixedly installed on the side of fixed handle, double-sided driving gear is rotatably installed in the middle part of protective shell, rocker is rotatably installed at the center of double-sided driving gear, bevel gear is meshed in the both sides of double-sided driving gear, and the center of bevel gear is fixedly installed with shaft, and the bottom of shaft is fixedly installed with stirring paddle. The utility model can remove air bubble by negative pressure environment, and the design of external double gear transmission, double-sided driving gear and bevel gear realize bidirectional synchronous stirring, improve mixing uniformity, protective shell isolates to prevent gear and bone cement direct contact, avoid metal particle pollution.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a vacuum-type bone cement mixer. Background Technology

[0002] Bone cement is a medical material used to fix artificial joints, repair bone defects, or fill cavities after bone tumor removal. Its function is similar to cement in construction; it rapidly solidifies to form a strong structure, providing support and fixation for the bone and aiding in functional recovery. The core component of bone cement is polymethyl methacrylate (PMMA), which consists of both powder and liquid components. When used, these two components are mixed, and the mixture polymerizes through a chemical reaction to form a hard substance. There is also calcium phosphate bone cement, which is made by mixing calcium phosphate salt powder with a liquid such as water or saline solution. Under physiological conditions, it self-solidifies to form hydroxyapatite, which is similar in composition to human bone tissue.

[0003] An existing vacuum-type bone cement mixer, with publication number CN218553890U, includes a first container, a second container, and a mixer. The mixer includes a mixing container, a cover, a rocker arm, a mixing element, and a vacuum pump. The cover and the mixing container are detachably and sealed together. The rocker arm passes through the cover and can rotate relative to the cover along an axis. A first gear is provided at the end of the rocker arm facing the mixing container, perpendicular to the rocker arm. The mixing element is connected to the side of the first gear away from the rocker arm. The vacuum pump is provided with a second gear and is fixed to the cover through the second gear. The first gear and the second gear mesh.

[0004] However, the first and second gears are located inside the mixing container and are in direct contact with the bone cement material. During the gear transmission process, metal particles may be generated due to friction and mixed into the bone cement. The accumulation of particles may form stress concentration points, reducing the compressive strength of the bone cement. The mixing paddle adopts a hollow design in the middle to enhance the mixing effect, but the hollow structure may reduce the strength of the mixing paddle, especially when rotating at high speed, it is easy to deform or break. Damage to the mixing paddle will lead to uneven mixing of bone cement, or even get stuck in the mixing container, requiring interruption of the procedure for cleaning. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this utility model provides a vacuum-type bone cement mixer. The negative pressure environment can remove air bubbles, and the external double gear transmission design enhances the uniformity of mixing. The double-sided drive gear and bevel gear achieve bidirectional synchronous mixing, improving the uniformity of mixing. The protective shell isolates the gears from direct contact with the bone cement, avoiding contamination by metal particles.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a vacuum-type bone cement mixer, comprising a mixing container body for placing bone cement material, a cover assembly movably mounted on the upper part of the mixing container body, the cover assembly including a cover plate, a vacuum conduit fixedly mounted on the upper part of the cover plate, and a mixing component for mixing bone cement fixedly mounted on the upper and lower parts of the cover plate, the mixing component including a fixed handle, a protective shell, a rocker arm, a double-sided drive gear and a bevel gear, the fixed handle being fixedly mounted on the upper surface of the cover plate, the protective shell being fixedly mounted on one side of the fixed handle, the double-sided drive gear being rotatably mounted in the middle of the protective shell, the rocker arm being rotatably mounted at the center of the double-sided drive gear, two sets of bevel gears being rotatably mounted on the upper surface of the cover plate and located on both sides of the bottom of the protective shell, the bevel gears meshing with the double-sided drive gears on both sides, a rotating shaft being fixedly mounted at the center of the bevel gear, and a stirring paddle being fixedly mounted at the bottom of the rotating shaft, the rotating shaft and the stirring paddle being located inside the mixing container body.

[0007] As a preferred technical solution of this utility model, a fixing ring plate is fixedly installed at the upper end of the stirring container body, and a number of limiting grooves are opened on the upper surface of the fixing ring plate, and a threaded groove is opened on the upper inner wall of the stirring container body.

[0008] As a preferred embodiment of this utility model, a number of limiting posts are fixedly installed on the outer wall of the cover plate. The limiting posts can be inserted into the inside of the limiting groove. A sealing ring is fixedly installed at the bottom of the cover plate. A threaded strip is welded to the outer wall of the sealing ring. The threaded strip and the limiting groove drive the sealing ring and the cover plate to rotate inside the stirring container body.

[0009] As a preferred embodiment of this utility model, the upper surface of the cover plate is provided with an arrow mark groove.

[0010] As a preferred embodiment of this utility model, the bottom wall of the protective shell is provided with snap-fit ​​blocks on both sides, and the two sides of the cover plate are snap-fitted into the snap-fit ​​blocks and bolted in place.

[0011] Compared with the prior art, the beneficial effects that this utility model can achieve are: The mixing container holds the bone cement powder and liquid. The container is disposable and made of polycarbonate. The cover assembly includes a cover plate and a vacuum conduit for sealing and evacuation. A handle secures the protective shell, providing an operating fulcrum. The protective shell isolates the double-sided drive gears, preventing bone cement contamination. A rocker arm manually drives the double-sided drive gears, which transmit power to the two bevel gears via gear meshing. The bevel gears convert horizontal rotation to vertical rotation, driving the shaft and mixing paddle. The shaft and paddle directly mix the bone cement. The paddle design balances mixing efficiency and structural strength. A negative pressure environment removes over 99% of air bubbles. The external double-gear drive design enhances mixing uniformity. The double-sided drive gears and bevel gears achieve bidirectional synchronous mixing, improving uniformity. The protective shell isolates the gears from direct contact with the bone cement, preventing metal particle contamination. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the present utility model; Figure 2 This is a structural diagram of the stirring assembly of this utility model; Figure 3 This is an unfolded view of the mixing container body and mixing assembly of this utility model; Figure 4 This is an unfolded view of the stirring assembly and the cover assembly of this utility model.

[0013] The components are as follows: 1. Stirring container body; 11. Fixing ring plate; 111. Limiting groove; 12. Threaded groove; 2. Cover assembly; 21. Cover plate; 211. Limiting column; 212. Arrow mark groove; 22. Sealing ring; 23. Vacuum conduit; 221. Threaded strip; 3. Stirring assembly; 31. Fixing handle; 32. Protective shell; 321. Snap-fit ​​block; 33. Rocker arm; 34. Double-sided drive gear; 35. Bevel gear; 351. Rotating shaft; 352. Stirring paddle. Detailed Implementation

[0014] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this utility model. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0015] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this utility model provides a vacuum-type bone cement mixer, including a mixing container body 1 for holding bone cement material. A cover assembly 2 is movably installed on the upper part of the mixing container body 1. The cover assembly 2 includes a cover plate 21, and a vacuum conduit 23 is fixedly installed on the upper part of the cover plate 21. A mixing component 3 for mixing bone cement is fixedly installed on the upper and lower parts of the cover plate 21. The mixing component 3 includes a fixed handle 31, a protective shell 32, a rocker arm 33, a double-sided drive gear 34, and a bevel gear 35. The fixed handle 31 is fixedly installed on the upper surface of the cover plate 21, protecting the bone cement. The shell 32 is fixedly installed on one side of the fixed handle 31. The double-sided drive gear 34 is rotatably installed in the middle of the protective shell 32. The rocker arm 33 is rotatably installed at the center of the double-sided drive gear 34. Two sets of bevel gears 35 are rotatably installed on the upper surface of the cover plate 21 and located on both sides of the bottom of the protective shell 32. The bevel gears 35 mesh with the two sides of the double-sided drive gear 34. A rotating shaft 351 is fixedly installed at the center of the bevel gear 35. A stirring paddle 352 is fixedly installed at the bottom of the rotating shaft 351. The rotating shaft 351 and the stirring paddle 352 are located inside the stirring container body 1.

[0016] In this embodiment, the mixing container body 1 is used to hold bone cement powder and liquid. The mixing container body 1 is a disposable item made of polycarbonate. The cover assembly 2 includes a cover plate 21 and a vacuum conduit 23 to achieve sealing and air extraction functions. The fixed handle 31 of the mixing assembly 3 fixes the protective shell 32 and provides an operating fulcrum. The protective shell 32 isolates the double-sided drive gear 34 to prevent bone cement from contaminating the gear. The rocker arm 33 manually drives the double-sided drive gear 34 to rotate. The double-sided drive gear 34 transmits power to the two bevel gears 35 through gear meshing. The bevel gears 35 convert the horizontal rotation into vertical rotation, driving the rotating shaft 351 and the mixing paddle 352. The rotating shaft 351 and the mixing paddle 352 directly mix the bone cement. The paddle design needs to take into account both mixing efficiency and structural strength. Pour the bone cement powder and liquid into the mixing container body 1 in proportion, close the cover assembly 2 and ensure it is sealed, connect an external vacuum pump through the vacuum conduit 23, and use a bottom air suction device with a limit negative pressure value greater than 0.09MPa and a pumping rate of 232L / min to remove the air in the container to -80kPa to -90kPa to eliminate air bubbles in the bone cement. Rotate the rocker arm 33 to drive the double-sided active gear 34 to rotate, which drives the two bevel gears 35 on both sides to rotate synchronously through gear meshing, thereby driving the rotating shaft 351 and the stirring paddle 352 to stir the bone cement at a speed of 300-500rpm for 2-3 minutes until uniform. Open the cover assembly 2 and take out the mixed bone cement for implantation or filling operations. The negative pressure environment can remove more than 99% of air bubbles. The external double gear drive design enhances the uniformity of mixing. The double-sided drive gear 34 and bevel gear 35 realize bidirectional synchronous mixing and improve the uniformity of mixing. The protective shell 32 isolates and prevents the gears from direct contact with the bone cement, avoiding metal particle contamination.

[0017] Specifically, a fixing ring plate 11 is fixedly installed at the upper end of the mixing container body 1. Several sets of limiting grooves 111 are opened on the upper surface of the fixing ring plate 11, and a threaded groove 12 is opened on the upper inner wall of the mixing container body 1.

[0018] In this embodiment, the fixing ring plate 11 is welded or integrally formed on the upper end of the mixing container body 1 to form an annular boss structure. The number of limiting grooves 111 is designed to be 3 sets with a 120° interval, evenly distributed on the upper surface of the fixing ring plate 11. It cooperates with the limiting post 211 of the cover assembly 2 to ensure accurate positioning of the cover and avoid sealing failure due to eccentricity during mixing. The threaded groove 12 is opened on the upper inner wall of the mixing container body 1, 10-20mm from the port, and screws into the threaded strip 221 of the cover assembly 2. The threaded groove 12 cooperates with the sealing ring 22 and can withstand the negative pressure generated by the vacuum pump to avoid air leakage and bone cement air bubbles remaining.

[0019] Specifically, a number of limiting posts 211 are fixedly installed on the outer wall of the cover plate 21. The limiting posts 211 can be inserted into the inside of the limiting groove 111. A sealing ring 22 is fixedly installed at the bottom of the cover plate 21. A threaded strip 221 is welded to the outer wall of the sealing ring 22. The threaded strip 221 and the limiting groove 111 drive the sealing ring 22 and the cover plate 21 to rotate inside the mixing container body 1.

[0020] In this embodiment, the limiting post 211 and the limiting groove 111 are inserted and matched. The limiting post 211 is usually designed as 3 sets, which are evenly distributed at 120° intervals along the outer circumference of the cover plate 21 and correspond one-to-one with the limiting groove 111 on the fixing ring plate 11. The sealing ring 22 is made of medical grade silicone rubber. The threaded strip 221 is spirally welded along the outer wall of the sealing ring 22 and matches the threaded groove 12 on the inner wall of the mixing container body 1. When the cover plate 21 rotates, the threaded strip 221 engages with the threaded groove 12, and the axial force is converted into radial sealing force through the thread helix angle, thereby improving the sealing reliability.

[0021] Specifically, the upper surface of the cover plate 21 is provided with an arrow mark groove 212.

[0022] In this embodiment, it is usually opened in the central area of ​​the upper surface of the cover plate 21, aligned with the rotation axis of the cover plate 21. The screwing direction of the cover plate 21 is clearly indicated by the arrow. It is tightened clockwise and opened counterclockwise to avoid the medical staff causing the seal to fail or the equipment to be damaged due to incorrect direction.

[0023] Specifically, the bottom wall of the protective shell 32 has snap-fit ​​blocks 321 on both sides, and the cover plate 21 is snap-fitted into the inside of the snap-fit ​​blocks 321 and bolted in place.

[0024] In this embodiment, the snap-fit ​​block 321 and the protective shell 32 are integrally injection molded, and the protective shell 32 and the cover plate 21 are integrated for easy operation.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A vacuum-type bone cement mixer, characterized in that: The container includes a mixing vessel body (1) for holding bone cement material. A cover assembly (2) is movably mounted on the upper part of the mixing vessel body (1). The cover assembly (2) includes a cover plate (21). A vacuum conduit (23) is fixedly mounted on the upper part of the cover plate (21). A mixing assembly (3) for mixing bone cement is fixedly mounted on the upper and lower parts of the cover plate (21). The mixing assembly (3) includes a fixed handle (31), a protective shell (32), a rocker arm (33), a double-sided drive gear (34), and a bevel gear (35). The fixed handle (31) is fixedly mounted on the upper surface of the cover plate (21), and the protective shell (32) is fixedly mounted on the fixed handle (35). On one side of the handle (31), the double-sided drive gear (34) is rotatably mounted in the middle of the protective shell (32), the rocker arm (33) is rotatably mounted at the center of the double-sided drive gear (34), and two sets of bevel gears (35) are rotatably mounted on the upper surface of the cover plate (21) and located on both sides of the bottom of the protective shell (32). The bevel gears (35) mesh with the two sides of the double-sided drive gear (34). A rotating shaft (351) is fixedly mounted at the center of the bevel gears (35), and a stirring paddle (352) is fixedly mounted at the bottom of the rotating shaft (351). The rotating shaft (351) and the stirring paddle (352) are located inside the stirring container body (1).

2. The vacuum-type bone cement mixer according to claim 1, characterized in that: A fixing ring plate (11) is fixedly installed at the upper end of the stirring container body (1). Several sets of limiting grooves (111) are opened on the upper surface of the fixing ring plate (11). A threaded groove (12) is opened on the upper inner wall of the stirring container body (1).

3. The vacuum-type bone cement mixer according to claim 1, characterized in that: The outer wall of the cover plate (21) is fixedly installed with several sets of limiting posts (211). The limiting posts (211) can be inserted into the inside of the limiting groove (111). The bottom of the cover plate (21) is fixedly installed with a sealing ring (22). The outer wall of the sealing ring (22) is welded with a threaded strip (221). The threaded strip (221) and the limiting groove (111) drive the sealing ring (22) and the cover plate (21) to rotate inside the stirring container body (1).

4. The vacuum-type bone cement mixer according to claim 1, characterized in that: The upper surface of the cover plate (21) is provided with an arrow mark groove (212).

5. The vacuum-type bone cement mixer according to claim 1, characterized in that: The protective shell (32) has snap-fit ​​blocks (321) on both sides of its bottom wall. The cover plate (21) is snap-fitted into the inside of the snap-fit ​​blocks (321) and bolted in place.

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