- 學位論文
智能化超音波牙科手術系統用換能器之設計
Design of transducer for intelligent ultrasonic dental surgery system
摘要
音波壓電陶瓷換能器目前被廣泛的運用在機械、生醫之領域，其中超音波牙科手術器具也漸漸取代傳統牙科手術所使用的電磁式器具。超音波手術器具在口腔中進行手術難免有觸碰到口腔內之軟組織的潛在危險，因此，在目前的超音波換能器中有必要加裝軟硬材質感測器以幫助避免手術中不必要的危險；更進一步，還可以協助牙醫師了解手術中的狀況。 為了使換能器具有軟硬材質感測能力，我們分別進行了在換能器的前、後蓋間裝置感測壓電陶瓷環與在後蓋末端裝置感測壓電陶瓷環的相關實驗。量測結果發現感測壓電陶瓷環裝置在前、後蓋間的智能化換能器的振動位移約是裝置感測壓電陶瓷環在後蓋末端的智能化換能器的兩到三倍。而就剛性感測的解析度而言，感測壓電陶瓷環裝置在前、後蓋之間的智能化換能器的剛性感測靈敏度是感測壓電陶瓷環裝置在後蓋末端的2.2倍。兩種設計都具有軟硬材質的辨識能力。
並列摘要
Piezoelectric ceramic ultrasonic transducer is widely used in mechanical and biomedical areas in recent years. Also, the instruments of ultrasonic dental surgery are gradually replacing the traditional magnetostrictive instruments. However, there are risks when the ultrasonic surgical instruments work in the oral cavity, since the ultrasonic surgical instruments may injure the soft tissue. Therefore, it would be necessary that we put stiffness sensor into the ultrasonic transducer to prevent from the danger that could happen in surgery. Moreover, it can help the dentists get better control of the situation in surgery. To make the transducer able to distinguish hard and soft materials, we conducted the experiments of installing sensor PZT ring between the horn and back of transducer, and installing it at the end of the back of transducer. We found that the vibration displacement of the smart transducer that installs the sensor PZT ring at the end of the back is 2 to 3 times more than the one that installs the sensor PZT ring between the horn and the back. As to the sensitivity, the smart transducer that installs the sensor PZT ring between the horn and back is 2.2 times more than installing the sensor PZT ring at the end of the back. Both designs have the ability to distinguish hard and soft materials.