| Fracture healing is a completely renewable healing way. Due to the specialization of structure and function of the bone, a long time is required for fracture healing. The low-intensity pulsed ultrasound for bone healing treatment is based on ultrasonic wave stimulate fracture wound and arouse the recovery of the bone tissue, and accelerate osteoblast growth and promote bone growth. This therapy has been used in clinical treatment, but the therapeutic result differs from the different ages, genders and different fracture location, significantly. What conditions make osteoblasts grow fastest with a best curative effect is not yet clear. Accordingly, it is necessary to analyze the sound field near fracture.ObjectiveIn order to achieve the best therapeutic effect, it is necessary to select the most appropriate treatment parameters to fracture patients according to their different age, gender, and different fracture position during the LIPUS bone healing treatment. In the study, the experimental measurement is applied to evaluate the influence of different power, bone characteristics, bone injury on the distribution of the near sound field pressure and provide a reference data during the LIPUS clinical bone healing treatment.MethodsDesign a acoustic pressure field measurement system and measure the distribution of the acoustic pressure in the water with propagating through the bone plate and without propagating through the bone plate based on the plane ultrasound transducer. Then draw the profile of the pressure measured in the experiment and analyze the relationship curve of the sound field when the therapy parameters and bone characteristics changed, respectively.ResultsIn the near field stimulated by LIPUS, the acoustic pressure rises nonlinearly with the increase of the input power; When the bone tissue thickness ranges from lmm to5mm, the acoustic pressure on acoustic axis rises obviously at the maximum point with the bone thickness increasing, however, acoustic pressure changes little at the minimum point; The water between the bone tissue and the transducer exerted little effect on the sound pressure; with the fracture crack width increased, the amplitude of pressure in the acoustic axis ascends as well.ConclusionThe sound field distribution and the maximum and minimum values of the near-sound inside the sound pressure level are effected by bone tissue thickness the position of the fracture cracks, shape; It is necessary to make different treatment parameters of LIPUS to promote fracture healing treatment according to different conditions. |
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