| Summary: | 碩士 === 國立交通大學 === 機械工程學系 === 100 === Intramedullary nailing is a common surgical operation to repair fractures of long bones. One difficult part of the surgery is to locate the accurate drilling position and direction for interlocking screws, which is invisible to the naked eyes. In clinical case, medical professional can use manoeuvrable X-ray machine to locate drilling position. However, the high radiation environment is harmful.
In the previous literatures of non-radiation position, most approaches only locate drilling position, not the drilling direction. Only few of them used active system to locate drilling position and direction at the same time. Here a novel and simple design using passive magnets is proposed to locate drilling position and direction to simplify the distal locking process in intramedullary nailing operation in a more intuitive way. The device consists of three magnetic pins and an electrical conductive board. The three symmetrically placed magnetic pins can rotate freely and point to the permanent magnet inside the nail. The drilling position and direction can be obtained by moving the device with those magnetic pins to align with the magnet in the nail. The alignment can be detected through the contact between magnetic pins and upper conductive board. When the device is not aligned with the magnet in the nail properly, either in position or direction, the pins then will contact with the board to trigger a light-emitting diode for alarming.
It is shown that the accuracies in position and direction are 3 mm and 10 degrees, respectively, with remote vertical distance of 15mm-20mm, which takes less than 5 minutes to complete and verifies the feasibility of the proposed design.
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