Bone cement mixing device applied to biomedicine

Abstract

The invention relates to a bone cement mixing device applied to biomedicine, which comprises a container, an upper cover, a rocker arm, a handle, a coupler and a stirring blade, and further comprises a bull gear, a pinion and an air bag assembly, the large gear and the small gear form a rotating extrusion mechanism, the air bag assembly is composed of a plurality of adjusting air bag units, and the rotating extrusion mechanism sequentially extrudes / releases the adjusting air bag units so that the sizes of the adjusting air bag units can be reduced or elastically reset. Therefore, after the adjusting air bag unit sucks air in the bone cement in the container into the adjusting air bag unit, the air is extruded out of the bone cement mixing device applied to the biomedicine through the exhaust flow channel.

Description

[0001] Technical Field This invention relates to the field of biomedical engineering equipment technology, and more particularly to a bone cement mixing device for biomedical applications.

[0002] Background Technology: Bone cement technology and bone cement mixing equipment technology are important interdisciplinary branches in the field of biomedical engineering, integrating materials science, mechanical engineering, and clinical medicine. The core of bone cement technology lies in the engineering design of biocompatible materials (such as polymethyl methacrylate (PMMA) or biodegradable calcium phosphate ceramics) to achieve functions such as bone defect repair, joint fixation, and local sustained drug release. Its development not only focuses on the mechanical properties, curing characteristics, and bioactivity of the materials themselves, but also strives to solve clinical pain points such as excessive exothermic polymerization, mechanical fatigue, and interfacial bonding issues in traditional bone cement. Bone cement mixing equipment technology is a key engineering guarantee for ensuring the stable performance of the material.

[0003] Bone cement, as a fixation and repair material, is used in artificial joint replacement surgery and for unstable fractures caused by malignant tumors. In its application, the bone cement and binder must first be thoroughly mixed before being delivered to the body via a delivery system. Biomedical bone cement mixing devices are used to thoroughly mix bone cement and binder.

[0004] Currently, most existing bone cement mixing equipment consists of a non-sealed mixing bowl and a scraper. In use, the bone cement and binder are poured into the mixing bowl together, and then manually mixed evenly using the scraper.

[0005] This approach has the following drawbacks: (1) Manual stirring with a scraper is inefficient and arbitrary. It cannot ensure that the bone cement in the mixing bowl is mixed evenly. There will always be areas where the bone cement is not mixed evenly with the binder, which reduces the effectiveness and lifespan of the bone cement.

[0006] (2) Small air bubbles are generated during the mixing process of bone cement and binder. The non-sealed mixing bowl cannot effectively remove these air bubbles, which affects the uniformity of mixing and thus reduces the effectiveness and lifespan of bone cement.

[0007] (3) Ordinary vacuum stirring devices usually require an external negative pressure source or negative pressure equipment, which are complex in structure, require large equipment investment, and have complicated surgical procedures.

[0008] Summary of the Invention In order to solve the problems existing in the prior art, the present application aims to provide a bone cement mixing device for biomedicine, including a container, a top cover, a rocker arm, a handle, a coupling, a stirring blade, a large gear, a small gear, and an airbag assembly; the rocker arm is connected to the coupling, and the coupling is disposed in the middle of the top cover in a manner that allows it to rotate around its central axis.

[0009] The large gear is fixedly installed inside the upper cover. The large gear is an internal gear and meshes with the small gear. The rocker arm can rotate to drive the small gear to rotate on its own axis and to drive the small gear to revolve around the internal teeth of the large gear.

[0010] The large gear and the small gear form a rotating extrusion mechanism. The airbag assembly consists of several adjustable airbag units. The rotating extrusion mechanism sequentially extrudes / releases the adjustable airbag units to reduce the volume of the adjustable airbag units / elastically reset them. This allows the adjustable airbag units to draw gas from the bone cement in the container into the adjustable airbag units and then squeeze it out and discharge it through the exhaust channel outside the bone cement mixing device used in biomedicine.

[0011] Adjacent regulating airbag units are connected by a flexible membrane. The large gear has several first cavities and several second cavities. The regulating airbag unit is sealed and installed in the first cavity, and the flexible membrane is sealed and installed in the second cavity.

[0012] In one embodiment, the adjustable airbag unit is installed with an interference fit to the first cavity, and the flexible membrane is installed with an interference fit to the second cavity, the second cavity being a narrow groove.

[0013] In another embodiment, the regulating airbag unit is sealed and installed in the first cavity by a sealing adhesive, and the flexible membrane is sealed and installed in the second cavity by a sealing adhesive.

[0014] The first cavity is an incomplete cylindrical shape, that is, the cross-section of the first cavity is fan-shaped and the fan shape is greater than 180 degrees. The edges on both sides of the inner wall of the first cavity form openings. The adjusting airbag unit is tightly fitted into the first cavity, and a part of the adjusting airbag unit is exposed outside the opening. The tooth tip of the pinion squeezes / releases the adjusting airbag unit at the opening.

[0015] When the tip of the pinion rotates, it sequentially contacts and disengages from the regulating airbag unit of the airbag assembly. When the tip of the pinion contacts the regulating airbag unit, it compresses the regulating airbag unit, causing its volume to shrink. After the tip of the pinion disengages from the regulating airbag unit, the volume of the regulating airbag unit automatically and elastically returns to its original position. This allows the regulating airbag unit to draw gas from the bone cement in the container into the regulating airbag unit, then expel it through the exhaust channel, thus discharging it outside the bone cement mixing device used in biomedicine.

[0016] Preferably, the number of the regulating airbag units is equal to the number of teeth of the large gear.

[0017] One end of the rocker arm is connected to the handle, and the other end of the rocker arm is connected to the rotating shaft. The stirring blade is eccentrically arranged, and the rotation axis of the stirring blade is concentric with the rotation axis of the pinion.

[0018] The exhaust flow channel includes: a first chamber, a second chamber, and an exhaust passage.

[0019] In another embodiment, the thickness of the pinion is equal to the thickness of the gear, and the pinion and the gear are fully meshed in the thickness direction, making the structure more compact and more stable.

[0020] The bone cement mixing device for biomedical applications provided by this invention has the following advantages: (1) The mixing blades of the bone cement mixing device applied in biomedicine of this application are eccentrically set, and the rotation axis of the mixing blades is concentrically set with the rotation axis of the pinion, so as to ensure good contact between the mixing blades and the inner wall of the container, and so that the bone cement material on the inner wall of the container is uniformly mixed.

[0021] (2) The large gear and the small gear form a rotating extrusion mechanism. The rotating extrusion mechanism sequentially extrudes / releases the regulating airbag unit to reduce the volume of the regulating airbag unit / elastically reset it, so that the regulating airbag unit draws the gas in the bone cement in the container into the regulating airbag unit and then squeezes it out and discharges it through the exhaust channel. It is used in biomedical bone cement mixing devices. The structure is simple and does not require an external negative pressure source or negative pressure equipment.

[0022] (3) The airbag assembly is embedded in the first and second cavities of the large gear and the airbag unit is installed with an interference fit with the first cavity and the flexible membrane is installed with an interference fit with the second cavity. This not only achieves a stable airtight seal, but also saves the volume of the entire bone cement mixing device used in biomedicine in the height direction, making the structure more compact. The design of the airbag unit, which is squeezed / released at the opening of the first cavity by the tip of the small gear, makes the deformation of the airbag unit during the inhalation and exhaust process more stable, ensuring the long service life of the entire device. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a bone cement mixing device applied to biomedicine according to an embodiment of this application; Figure 2 This is a cross-sectional schematic diagram of a bone cement mixing device applied to biomedicine according to an embodiment of this application; Figure 3 This is another cross-sectional schematic diagram of a bone cement mixing device applied to biomedicine according to an embodiment of this application; Figure 4 This is a schematic diagram of the gas exhaust channel of a bone cement mixing device applied to biomedicine, according to an embodiment of this application; Figure 5 This is a bottom-view cross-sectional schematic diagram of a bone cement mixing device applied to biomedicine according to an embodiment of this application; Figure 6 A schematic diagram of a bone cement mixing device applied to biomedicine according to an embodiment of this application, viewed from below; Figure 7 This is a schematic diagram of the intermediate morphological structure of the adjustable airbag in the manufacturing process of the bone cement mixing device applied to biomedicine according to an embodiment of this application; Figure 8 This is a schematic diagram of the final shape of the adjustable airbag structure of the bone cement mixing device applied to biomedicine according to an embodiment of this application. Figure 9 This is a schematic diagram of the deployment of the airbag assembly of a bone cement mixing device applied to biomedicine according to an embodiment of this application; Figure 10 This is a schematic diagram of the vertical structure of the airbag assembly of a bone cement mixing device applied to biomedicine according to an embodiment of this application.

[0024] Explanation of reference numerals in the attached drawings: 1-Container, 2-Top cover, 3-Rock arm, 4-Handle, 5-Coupling, 6-Large gear, 61-Internal gear, 7-Small gear, 71-Gear tip, 8-Stirring blade, 9-Rock shaft, 10-Sealing gasket, 11-Sealing ring, 12-Adjusting airbag unit, 121-First end, 122-Second end, 13-First chamber, 14-Second chamber, 15-Exhaust channel, 20-Flexible membrane. Detailed Implementation

[0025] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] The following disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0028] Example like Figures 1-5 As shown, this embodiment provides a bone cement mixing device for biomedical applications, including a container 1, a top cover 2, a rocker arm 3, a handle 4, a coupling 5, and stirring blades, and also includes: a large gear 6, a small gear 7, and an airbag assembly; the rocker arm 3 is connected to the coupling 5, and the coupling 5 is arranged in the middle of the top cover 2 in a manner that allows it to rotate around its central axis.

[0029] The large gear 6 is fixedly installed inside the upper cover 2. The large gear 6 is an internal gear and meshes with the small gear 7. The rocker arm 3 can rotate to drive the small gear 7 to rotate on its own axis and to drive the small gear 7 to revolve around the internal teeth 61 of the large gear 6.

[0030] The large gear 6 and the small gear 7 form a rotating extrusion mechanism. The airbag assembly includes several adjustable airbag units 12. The rotating extrusion mechanism sequentially extrudes / releases the adjustable airbag units 12 to reduce the volume of the adjustable airbag units 12 / elastically reset them. This allows the adjustable airbag units 12 to draw gas from the bone cement in the container 1 into the adjustable airbag units 12 and then squeeze it out and discharge it through the exhaust channel outside the bone cement mixing device used in biomedicine.

[0031] like Figure 6 As shown, adjacent regulating airbag units are connected by a flexible membrane. The large gear has several first cavities and several second cavities. The regulating airbag unit 12 is installed with an interference fit to the first cavity, and the flexible membrane 20 is installed with an interference fit to the second cavity. The second cavity is a narrow groove.

[0032] The first cavity is an incomplete cylindrical shape, that is, the cross-section of the first cavity is fan-shaped and the fan shape is greater than 180 degrees. The edges on both sides of the inner wall of the first cavity form openings. The adjusting airbag unit 12 is tightly fitted into the first cavity, and a part of the adjusting airbag unit 12 is exposed outside the opening. The tooth tip 71 of the pinion 7 squeezes / releases the adjusting airbag unit at the opening.

[0033] When the tip 71 of the pinion 7 rotates, it sequentially contacts and disengages from the regulating airbag unit 12 of the airbag assembly. When the tip 71 contacts the regulating airbag unit 12, it squeezes the regulating airbag unit 12, causing its volume to shrink. After the tip 71 disengages from the regulating airbag unit 12, the volume of the regulating airbag unit 12 automatically and elastically returns to its original position. This allows the regulating airbag unit 12 to draw gas from the bone cement in the container 1 into the regulating airbag unit 12, then squeeze it out and discharge it through the exhaust channel outside the bone cement mixing device used in biomedicine.

[0034] The number of the regulating airbag units 12 is equal to the number of teeth of the large gear 6.

[0035] One end of the rocker arm 3 is connected to the handle 4, and the other end of the rocker arm 3 is connected to the rotating shaft 9. The stirring blade 8 is eccentrically arranged, and the rotation axis of the stirring blade 8 is concentrically arranged with the rotation axis of the pinion 7, so as to ensure good contact between the stirring blade 8 and the inner wall of the container, so that the bone cement material on the inner wall of the container is uniformly stirred.

[0036] The exhaust flow path includes: a first chamber 13, a second chamber 14, and an exhaust channel 15.

[0037] The pinion 7 and the gear 6 have the same thickness.

[0038] like Figure 7 , Figure 8 As shown, during the manufacturing process of the adjustable airbag, it has an intermediate form. The adjustable airbag unit 12 has a first end 121 and a second end 122. The first end 121 is provided with an exhaust valve, and the second end 122 is provided with an intake valve. Figure 6 Figure b on the right is a cross-sectional view of figure a along the BB direction. The regulating airbag unit 12 is made of an elastic material with a certain hardness. The second end 122 of the intermediate-shaped regulating airbag unit 12 is folded inward along the axis of the regulating airbag unit 12 to form the final shape of the regulating airbag unit 12. Figure 7 The diagram d on the right is a cross-sectional view of diagram c along the CC direction. (See diagram d on the right.) Figure 9 , Figure 10 As shown, a plurality of adjustable airbag units 12 constitute an airbag assembly, and adjacent adjustable airbag units 12 are connected by a flexible membrane 20. A sealing ring 11 is installed between the coupling 5 and the upper cover, and a sealing gasket 9 is installed between the upper cover and the container.

[0039] Working principle: The operator places the bone cement into container 1, seals the top cover 2 to container 1, holds the handle and turns the rocker arm 3. The rocker arm 3 drives the pinion 7 to rotate via the coupling 5 and also drives the pinion 7 to revolve around the inner teeth 61 of the large gear 6. When the pinion 7 revolves, it drives the stirring blade 8 to rotate and stir the bone cement in container 1. Simultaneously, the pinion 7 contacts / detaches from the regulating airbag unit 12 and squeezes / releases the regulating airbag unit 12, causing the regulating airbag unit 12 to shrink in volume / elastically reset. When the tooth tip 71 of the pinion 7 contacts and squeezes the regulating airbag unit 12, the gas in the regulating airbag unit 12 is squeezed out by the exhaust valve and discharged outside the bone cement mixing device used in biomedicine through the first chamber 13, the second chamber 14, and the exhaust channel 15. The process of the pinion squeezing the regulating airbag unit 12 causes the regulating airbag unit 12 to store a certain elastic potential energy. When the tooth tip 71 detaches from the regulating airbag unit 12, the intake valve draws gas into the container 1. This process is repeated, and the regulating airbag unit 12 resets. Through continuous intake and exhaust, the regulating airbag unit 12 draws the gas in the bone cement in the container 1 into the regulating airbag unit 12, squeezes it out, and discharges it outside the bone cement mixing device used in biomedicine through the exhaust channel.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

Claims

1. A bone cement mixing apparatus for biomedical applications, comprising a container (1), a top cover (2), a rocker arm (3), a handle (4), a coupling (5), and a mixing blade (8), characterized in that, Also includes: Large gear (6), small gear (7), airbag assembly; The rocker arm (3) is connected to the coupling (5), and the coupling (5) is arranged in the middle of the upper cover (2) in a manner that allows it to rotate about its central axis; The large gear (6) is fixedly installed inside the upper cover (2). The large gear (6) is an internal gear and meshes with the small gear (7). The rocker arm (3) can rotate to drive the small gear (7) to rotate on its own axis and to drive the small gear (7) to revolve around the internal teeth (61) of the large gear (6). The large gear (6) and the small gear (7) form a rotating extrusion mechanism. The airbag assembly consists of several adjustable airbag units (12). The rotating extrusion mechanism sequentially extrudes / releases the adjustable airbag units (12) to reduce the volume of the adjustable airbag units (12) / elastically reset them. This allows the adjustable airbag units (12) to draw the gas in the bone cement in the container (1) into the adjustable airbag units (12) and then squeeze it out and discharge it through the exhaust channel to the outside of the bone cement mixing device used in biomedicine.

2. The bone cement mixing device for biomedical applications according to claim 1, characterized in that, Adjacent regulating airbag units (12) are connected by a flexible membrane (20). The large gear has a plurality of first cavities and a plurality of second cavities. The regulating airbag unit (12) is sealed in the first cavity, and the flexible membrane (20) is sealed in the second cavity.

3. The bone cement mixing device for biomedical applications according to claim 2, characterized in that, The first cavity is an incomplete cylindrical shape, the cross-section of the first cavity is fan-shaped and the fan shape is greater than 180 degrees, the edges of the inner wall of the first cavity form openings, the adjusting airbag unit is tightly fitted into the first cavity, and a part of the adjusting airbag unit is exposed outside the opening.

4. The bone cement mixing device for biomedicine according to claim 1, wherein the adjusting airbag is made of an elastic material of a certain hardness so that the adjusting airbag unit (12) can be elastically reset after the rotating compression mechanism releases it.

5. The bone cement mixing device for biomedicine according to claim 4, characterized in that, One end of the regulating airbag unit (12) is equipped with an inhalation valve and the other end is equipped with an exhaust valve.

6. The bone cement mixing device for biomedical applications according to claim 4, characterized in that, The number of airbag units (12) is equal to the number of teeth of the large gear (6).

7. The bone cement mixing device for biomedical applications according to claim 1, characterized in that, The exhaust flow channel includes: a first chamber, a second chamber, and an exhaust passage.

8. The bone cement mixing device for biomedical applications according to claim 1, characterized in that, One end of the rocker arm (3) is connected to the handle (4), and the other end of the rocker arm (3) is connected to the rotating shaft (9).

9. The bone cement mixing device for biomedical applications according to claim 3, characterized in that, The thickness of the pinion (7) is less than or equal to the thickness of the gear (6).

10. The bone cement mixing device for biomedicine according to claim 1, characterized in that, The stirring blade (8) is eccentrically arranged, and the rotation axis of the stirring blade (8) is concentrically arranged with the rotation axis of the pinion (7).

Images