Automatic stirring and injecting device for bone cement

Abstract

Provided is an automatic stirring and injecting device for bone cement, comprising a cylindrical structure (100), a sliding block (200), a stirrer (300), a piston (400), a stirrer driving device (500), and a piston driving device (600). The two ends of the cylindrical structure (100) are an open mounting port (110) and a tapered injecting port (120), and the side wall of the cylindrical structure (100) is provided with a feeding port (130). One end of the stirrer (300) passes through the mounting port (110) of the cylindrical structure (100) and is arranged inside the cylindrical structure (100), and the other end is connected to a rotating shaft of the stirrer driving device (500). One end of the piston (400) passes through the mounting port (110) of the cylindrical structure (100) and is arranged inside the cylindrical structure (100), and the other end abuts against the sliding block (200). The sliding block (200) is connected to the piston driving device (600) and driven by the piston driving device (600) to perform linear motion. The automatic stirring and injecting device for bone cement achieves the integrated operation of stirring and injecting the bone cement by means of a unique combination of the piston (400) and the stirrer (300). The present disclosure features a high automation degree and reduced overall operation time due to the electrically driven stirring and injecting processes, thereby relieving physical burdens on operators and reducing exposure of the operators and patients to rays.

Description

A bone cement automatic stirring and injection device Technical Field

[0001] The invention relates to the field of medical surgery, and in particular to an automatic bone cement stirring and injection device. Background Art

[0002] Bone cement, a medical material widely used in orthopedic surgery, is named for its unique physical properties and its appearance and shape, after solidification, similar to white cement used in construction. As a common implant, bone cement has a wide range of applications in the medical field, playing a particularly important role in procedures such as vertebroplasty and joint replacement. With the continuous improvement of medical standards in my country, the use of bone cement has also shown an annual growth trend.

[0003] The use of bone cement involves two key processes: mixing and injection. Before surgery, the doctor mixes the solid and liquid ingredients and manually stirs them for several minutes to ensure a uniform mixture. The doctor then transfers the mixed cement into a syringe for injection.

[0004] However, the bone cement mixing devices currently developed by researchers still have some shortcomings. First, most of these devices are manually operated, using tools with stirring blades for stirring, which is time-consuming and labor-intensive. Second, these devices usually only have a stirring function and lack an injection function, which requires doctors to change tools for injection after stirring, increasing the complexity of the operation. Finally, because the injection of bone cement requires precise control of the injection volume, doctors often need to move frequently between the operating table and the medical imaging room to control the injection volume by observing the images. This method not only prolongs the operation time, but also brings inconvenience to the medical staff's operation and increases the exposure of the operator and / or patient to radiation.

[0005] To address these issues, patents CN202221323452.X and CN201120395926.7 respectively propose two new bone cement mixing devices. Patent CN202221323452.X demonstrates a miniature electric stirrer that uses a motor to drive a spiral blade to transport the raw material from the bottom of the centrifuge tube to the top and stir it, improving stirring efficiency. However, this device still has some limitations, such as the inability to adjust the stirring speed, the inability to directly use it for injection, and the inability to achieve remote operation.

[0006] Patent CN201120395926.7, on the other hand, describes a convenient bone cement stirring and injection device. This device cleverly combines a stirring frame and a syringe body, achieving integrated stirring and injection operations. The bone cement is stirred by turning the stirring handle, while injection is achieved by pressing the handle downward. This design simplifies the procedure and improves surgical efficiency. However, this device also has some shortcomings, such as manual stirring and injection operations, the inability to automate operations, and a lack of remote control capabilities.

[0007] In summary, although these two new bone cement mixing devices have solved the problems existing in the traditional surgical preparation process to a certain extent, there are still some limitations that need further improvement and perfection. Summary of the Invention

[0008] The purpose of the present invention is to propose an automatic bone cement stirring and injection device, which has the functions of automatically adjusting the stirring speed and integrating stirring and injection functions, so as to meet a wider range of clinical needs and improve surgical efficiency, thereby enhancing the convenience and efficiency of bone cement surgery.

[0009] In order to achieve the above object, the technical solution of the present invention is:

[0010] A bone cement automatic stirring and injection device comprises a cylindrical structure, a sliding block, an agitator, a piston, an agitator drive device and a piston drive device; the two ends of the cylindrical structure are respectively an open mounting port and a narrowed injection port, and a feed port is provided on its side wall; one end of the agitator passes through the mounting port of the cylindrical structure and is placed inside the cylindrical structure, and the other end is connected to the rotating shaft of the agitator drive device; one end of the piston passes through the mounting port of the cylindrical structure and is placed inside the cylindrical structure, and the other end rests on the sliding block; the sliding block is connected to the piston drive device and is driven thereby to perform linear motion.

[0011] The sliding block consists of an upper sliding block, a lower sliding block, a bearing and a retaining ring. The upper sliding block and the lower sliding block have grooves that match the outer ring of the bearing. The bearing is placed in the groove, the retaining ring rests on the bearing, and the other end of the piston rests on the retaining ring of the sliding block.

[0012] The installation port is equipped with an end cover that cooperates with the stirrer and the piston and closes the installation port.

[0013] The stirrer is installed at one end of the cylindrical structure and is provided with a plurality of blades. The blades are arranged along the axial direction of the stirrer, and the installation and movement space of the piston is formed between two adjacent blades and the cylindrical wall of the cylindrical structure.

[0014] The blades are provided with through holes to facilitate the mixing of bone cement.

[0015] One end of the piston installed inside the cylindrical structure has a columnar structure that is tightly matched with the adjacent blades and the cylindrical wall.

[0016] A nut is fixed on the sliding block, a screw is fixed on the output shaft of the piston drive device, and the nut is mounted on the screw. In this process, the cooperation between the nut and the sliding block ensures that the piston only performs linear motion.

[0017] The working principle of the present invention is as follows:

[0018] Stirring action: When the agitator drive device is started, it drives the agitator and the piston on it to rotate, thereby achieving uniform mixing of bone cement;

[0019] Injection action: The activation of the piston drive device transmits linear motion to the three pistons through a series of mechanical connections, pushing the bone cement along the axis of the mixer for injection.

[0020] The present invention realizes the integrated operation of bone cement stirring and injection through the uniquely designed piston and stirrer combination; it has a high degree of automation and uses electrical drive to drive the stirring and injection process, which shortens the overall operation time, reduces the physical burden of the operator, and reduces the exposure of the operator and / or the patient to radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of the assembly of the actuator of the present invention.

[0022] FIG2 is a cross-sectional view taken along line AA in FIG1 .

[0023] FIG3 is an exploded view of the piston and the agitator in the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] As shown in Figures 1 and 2, the bone cement automatic stirring and injection device of the present invention includes a cylindrical structure 100, a sliding block 200, an agitator 300, a piston 400, an agitator driving device 500 and a piston driving device 600; the two ends of the cylindrical structure are respectively an open mounting port 110 and a narrowed injection port 120, and a feed port 130 is provided on its side wall, which can be completely sealed after the feeding is completed; one end of the agitator passes through the mounting port of the cylindrical structure and is placed inside the cylindrical structure, and the other end is connected to the rotating shaft of the agitator driving device. This connection can be a direct connection or an indirect connection. In this embodiment, the connection is through a coupling 700; the sliding block is connected to the piston driving device and is driven by it to perform linear motion; the sliding block is composed of an upper sliding block 210, a lower sliding block 220, a bearing 230 and a retaining ring 240. The upper sliding block and the lower sliding block have grooves that match the outer rings of the bearings. The bearings are placed in the grooves, and the retaining rings are against the bearings. One end of the piston passes through the mounting port of the cylindrical structure and is placed inside the cylindrical structure, and the other end of the piston is against the retaining ring of the sliding block.

[0026] The installation port is equipped with an end cover that cooperates with the agitator and the piston and closes the installation port. The end cover in this embodiment is composed of a left end cover 1101 and a right end cover 1102.

[0027] The agitator is installed at one end of the cylindrical structure and is provided with a plurality of blades 310. In this embodiment, three blades are provided. The blades are arranged along the axial direction of the agitator, and the installation and movement space of the piston is formed between two adjacent blades and the cylindrical wall of the cylindrical structure.

[0028] The blades are provided with through holes 3101 to facilitate the mixing of bone cement.

[0029] One end of the piston installed inside the cylindrical structure has a columnar structure 410 that closely matches the adjacent blades and the cylinder wall.

[0030] The sliding block is fixed with a nut 250, which in this embodiment is fixed below the lower sliding block. The output shaft of the piston drive device is fixed with a screw rod 610, and the nut is mounted on the screw rod. In this process, the cooperation between the nut and the sliding block ensures that the piston only performs linear motion.

[0031] The agitator drive device and the piston drive device in this embodiment both use electric motors, but this choice is not used to limit the scope of protection of the present invention. Any device that can achieve the same technical effect and manual operation are within the scope of protection required by the present invention.

[0032] In another embodiment of the present invention, a remote wireless operating device may be further included. A control device disposed on the main body of the bone cement automatic stirring and injection device of the present invention receives signals from the remote wireless operating device and controls the agitator drive device and the piston drive device according to the instructions. For those skilled in the art, both the remote wireless operating device and the control device are based on existing electrical and automation technologies.

[0033] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A bone cement automatic stirring and injection device, characterized in that: It includes a cylindrical structure, a sliding block, an agitator, a piston, an agitator drive device and a piston drive device; the two ends of the cylindrical structure are an open installation port and a narrowed injection port respectively, and a feed port is provided on its side wall; one end of the agitator passes through the installation port of the cylindrical structure and is placed inside the cylindrical structure, and the other end is connected to the rotating shaft of the agitator drive device; one end of the piston passes through the installation port of the cylindrical structure and is placed inside the cylindrical structure, and the other end rests on the sliding block; the sliding block is connected to the piston drive device and is driven by it to perform linear motion.

2. The bone cement automatic stirring and injection device according to claim 1, characterized in that: The sliding block consists of an upper sliding block, a lower sliding block, a bearing and a retaining ring. The upper sliding block and the lower sliding block have grooves that match the outer ring of the bearing. The bearing is placed in the groove, the retaining ring rests on the bearing, and the other end of the piston rests on the retaining ring of the sliding block.

3. The bone cement automatic stirring and injection device according to claim 1, characterized in that: The installation port is equipped with an end cover that cooperates with the stirrer and the piston and closes the installation port.

4. The bone cement automatic stirring and injection device according to claim 1, characterized in that: The stirrer is installed at one end of the cylindrical structure and is provided with a plurality of blades. The blades are arranged along the axial direction of the stirrer, and the installation and movement space of the piston is formed between two adjacent blades and the cylindrical wall of the cylindrical structure.

5. The bone cement automatic stirring and injection device according to claim 4, characterized in that: The blades are provided with through holes to facilitate the mixing of bone cement.

6. The bone cement automatic stirring and injection device according to claim 4, characterized in that: One end of the piston installed inside the cylindrical structure has a columnar structure that is tightly matched with the adjacent blades and the cylindrical wall.

7. The bone cement automatic stirring and injection device according to claim 1, characterized in that: A nut is fixed on the sliding block, a screw rod is fixed on the output shaft of the piston driving device, and the nut is installed on the screw rod.

Images