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李孟學 (Meng-Shiue Lee)
李孟學 (Meng-Shiue Lee)
Development of positioning systems for distal locking of intramedullary nails
Development of positioning systems for distal locking of intramedullary nails
骨髓內釘固定孔定位系統的研發
骨髓內釘固定孔定位系統的研發
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.
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.
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.
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.
[1] M.-S. Lee, S.-Y. Wu, T.-H. Wong, W. Hsu, T.-K. Chung (October 2012). A Novel Guiding Device for Distal Locking of Intramedullary Nails. The 11th IEEE Conference on Sensors, Taipei, Taiwan.
[1] M.-S. Lee, S.-Y. Wu, T.-H. Wong, W. Hsu, T.-K. Chung (October 2012). A Novel Guiding Device for Distal Locking of Intramedullary Nails. The 11th IEEE Conference on Sensors, Taipei, Taiwan.
[2] T.-K. Chung, H.-J. Chu, T.-H. Wong, W. Hsu, M.-S. Lee, W.-T. Lo, and C.-Y. Tseng (October 2012). An Electromagnetic-Induction Approach for Screw-Hole Targeting in Interlocking-Nail Surgery. IEEE Conference on Sensors, Taipei, Taiwan.
[2] T.-K. Chung, H.-J. Chu, T.-H. Wong, W. Hsu, M.-S. Lee, W.-T. Lo, and C.-Y. Tseng (October 2012). An Electromagnetic-Induction Approach for Screw-Hole Targeting in Interlocking-Nail Surgery. IEEE Conference on Sensors, Taipei, Taiwan.
[3] T.-K. Chung, H.-J. Chu, T.-H. Wong, Y.-W. Cheng, W. Hsu, and M.-S. Lee (March 2013). Electromagnetic Coil/Inductance-Based Nondestructive Methods for Locating Distal Screw-Holes of an Intramedullary Interlocking-Nail. 2013 SPIE Conference on Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, San Diego, U.S.A..
[3] T.-K. Chung, H.-J. Chu, T.-H. Wong, Y.-W. Cheng, W. Hsu, and M.-S. Lee (March 2013). Electromagnetic Coil/Inductance-Based Nondestructive Methods for Locating Distal Screw-Holes of an Intramedullary Interlocking-Nail. 2013 SPIE Conference on Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, San Diego, U.S.A..
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