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吳嘉珮 (Chia-Pei Wu)
吳嘉珮 (Chia-Pei Wu)
Improvement of magnetic targeting devices with drilling test for distal locking in intramedullary nailing surgery
Improvement of magnetic targeting devices with drilling test for distal locking in intramedullary nailing surgery
骨髓內釘固定孔之磁力式定位裝置改進與鑽孔測試
骨髓內釘固定孔之磁力式定位裝置改進與鑽孔測試
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.
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.
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. By using the magnetic targeting devices, we test on transparent bone with a laser LED and swine tibia with drilling. First of all, we place intramedullary nail including a positioning magnet into tibia medullary cavity. 1st-stage targeting device targets approximate area of the positioning magnet with two responding magnets quickly. 2nd-stage targeting device is component of transparent material, consisting of three magnetic pins and an electrical conductive board. The three symmetrically placed magnetic pins can rotate freely and point to the positioning 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 observed by the overlap of magnetic pins and aligning line and detected through the contact between magnetic pins and upper conductive board. When the device is not aligned with the positioning magnet in the nail properly, either in position or direction, the magnetic pins then will contact with the board to trigger a system of two light-emitting diodes for indicating And when the device is right aligned with the positioning magnet in the nail, we can drill the location where we target by a screwdriver.
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. By using the magnetic targeting devices, we test on transparent bone with a laser LED and swine tibia with drilling. First of all, we place intramedullary nail including a positioning magnet into tibia medullary cavity. 1st-stage targeting device targets approximate area of the positioning magnet with two responding magnets quickly. 2nd-stage targeting device is component of transparent material, consisting of three magnetic pins and an electrical conductive board. The three symmetrically placed magnetic pins can rotate freely and point to the positioning 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 observed by the overlap of magnetic pins and aligning line and detected through the contact between magnetic pins and upper conductive board. When the device is not aligned with the positioning magnet in the nail properly, either in position or direction, the magnetic pins then will contact with the board to trigger a system of two light-emitting diodes for indicating And when the device is right aligned with the positioning magnet in the nail, we can drill the location where we target by a screwdriver.
We modify the magnetic targeting device that our lab developed. The primary emphasis of our research is (1) Promoted accuracy: The design of the diameter of the hole on the 2nd –stage targeting device decreases the movable space and reduces targeting error. (2) Indicated direction of 2nd –stage targeting device: Transparent material constitutes 2nd –stage targeting device, and it provide a function that the state of the magnetic pins are visible. With the function, we can target screw hole effectively. (3) Indicator with two light-emitting diodes: We can confirm that the electric loop is not breakdown when the light was red. The targeting is finished when the light was green. After we improved the magnetic targeting device, we verify the feasibility of the proposed design and applying on swine tibia.
We modify the magnetic targeting device that our lab developed. The primary emphasis of our research is (1) Promoted accuracy: The design of the diameter of the hole on the 2nd –stage targeting device decreases the movable space and reduces targeting error. (2) Indicated direction of 2nd –stage targeting device: Transparent material constitutes 2nd –stage targeting device, and it provide a function that the state of the magnetic pins are visible. With the function, we can target screw hole effectively. (3) Indicator with two light-emitting diodes: We can confirm that the electric loop is not breakdown when the light was red. The targeting is finished when the light was green. After we improved the magnetic targeting device, we verify the feasibility of the proposed design and applying on swine tibia.
The improvement of the magnetic targeting devices provides accurate targeting in position and direction quickly. It is shown that the accuracies in position and direction are 2.1 mm and 7 degrees, respectively, with remote vertical distance of 16mm-20mm, which takes less than 5 minutes to target and a screw hole, less than 10 minutes to target and drill a screw hole.
The improvement of the magnetic targeting devices provides accurate targeting in position and direction quickly. It is shown that the accuracies in position and direction are 2.1 mm and 7 degrees, respectively, with remote vertical distance of 16mm-20mm, which takes less than 5 minutes to target and a screw hole, less than 10 minutes to target and drill a screw hole.
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