Design Of An Ultrasonic Motor-driven External Fixator

For intractable orthopedic illnesses such fractures and skeletal abnormalities,external fixation is a viable therapy option.The principle of external bone fixation is based on traction regeneration technology.It applies pressure to both ends of the broken bone with external bone fixation brackets to stimulate the healing of muscles,blood vessels,nerves,and other tissues around the wound.It offers a wide range of applications,a high cure rate,and the added benefit of reducing disease.Bone external fixation frames with a high clinical frequency currently suffer from a variety of issues,including complicated manual operation,high learning costs for doctors,manual adjustment errors,and structural faults.For a long time,foreign countries have had a monopoly on external bone fixing technology.In our country,there is no self-developed bone external fixation frame,resulting in expensive treatment expenses and bone external fixation technology prices.In this study,the research is carried out from two sides of hardware and software,combining the features of the existing bone external fixator,and an accurate,simple,and high-stability electronic bone external fixator driven by an ultrasonic motor is built.The following are the key research findings:The bone external fixator’s spatial structure was designed around a six-degree-offreedom parallel mechanism;the electric support rod and other parts were designed around an ultrasonic motor as the driving motor;the universal joint was improved;and the transmission system’s stability analysis.A PLC motion controller-based ultrasonic motor control system is planned,the control circuit diagram is made,the control system software is written,and the HMI human-machine interface is drawn using SATOOL software at the same time.The picture of the external fixation frame was rigorously calibrated using binocular stereo vision technology to get precise internal and external parameters,and the original image was processed using the internal and external parameters to obtain an undistorted image.The undistorted pictures were used to compute the relative positional connection between the upper and lower portions of the shattered bone and the external fixation frame,and the treatment prescription was formulated.To maximize the formulated treatment prescription,use the particle swarm algorithm.A binocular stereo vision system was constructed using two industrial cameras instead of X-ray machines as an experimental platform for bone external fixation.A bone reduction simulation experiment was conducted using the tibia as an example.For rectification,enter the formed treatment prescription into the touch screen.The experimental results are satisfactory,The distance of the broken bone is controlled at 2mm,and the deviation of the anatomical axis is less than 1mm,meets clinical standards,and creates the groundwork for future research.