@article{mohammadbagherpoor_acemoglu_mattos_caldwell_johnson_muth_grant_2022, title={Designing and Testing a Closed-Loop Magnetically Actuated Laser Scanning System for Tissue Ablation}, volume={16}, ISSN={["1932-619X"]}, DOI={10.1115/1.4053073}, abstractNote={Abstract Biomedical robotic systems continue to hold unlimited potential for surgical procedures. Robotized laser endoscopic tools provide surgeons with increased accuracy in the laser ablation of tissue and tumors. The research here catalogs the design and implementation of a new laser endoscopic tool for tissue ablation. A novel feature of this new device is the inclusion of a feedback loop that measures the position of the laser beam via a photo-detector sensor. The scale of this new device was governed by the dimensions of the photo-detector sensor. The tip of the laser's fiber optic cable is controlled by the torque interaction between permanent magnet rings surrounding the fiber optic and the custom designed solenoid coils. Prior to building the physical test-bed the system was modeled and simulated using COMSOL software. In pre-clinical trials, the physical experimental results showed that the designed prototype laser scanner system accurately track different ablation patterns and gives a consistent output position for the laser beam however, the heat diffusion into the tissue around the desired line of the geometric shape would give wider ablation margins than was desirable.}, number={2}, journal={JOURNAL OF MEDICAL DEVICES-TRANSACTIONS OF THE ASME}, author={Mohammadbagherpoor, Hamed and Acemoglu, Alperen and Mattos, Leonardo S. and Caldwell, Darwin and Johnson, James J. and Muth, John and Grant, Edward}, year={2022}, month={Jun} }
 @article{mohammadbagherpoor_ierymenko_craver_carlson_dausch_grant_lucey_2020, title={An Implantable Wireless Inductive Sensor System Designed to Monitor Prosthesis Motion in Total Joint Replacement Surgery}, volume={67}, ISSN={["1558-2531"]}, DOI={10.1109/TBME.2019.2943808}, abstractNote={Currently, the most common method for detecting prosthetic implant loosening is imaging. Unfortunately, imaging methods are imprecise in detecting the early signs of implant loosening. This paper describes a new wireless inductive proximity sensor system for detecting early implant loosening. The loosening of the implant is accurately detected by analyzing the electromagnetic field generated by the passive sensors located around the implant. The sensor system was modeled and simulated using COMSOL, and then tested experimentally. The inductive proximity sensor and the metallic implant form a coupled circuit is tuned to oscillate at a designed frequency. The circuit's integrated controller measures and records specific sensor's parameters such as resistance and inductance of the sensor that are directly related to the distance between the sensor system and the implant. A prototype has been developed and the results show that the designed proximity sensor is capable of measuring the loosening of the hip implant at 50 μm resolution at distances of less than 8 mm, and of 100 μm resolution at a distance of 15 mm. Furthermore, there is a good correlation between the simulated and experimental results.}, number={6}, journal={IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING}, author={Mohammadbagherpoor, Hamed and Ierymenko, Paul and Craver, Meghan H. and Carlson, Jim and Dausch, David and Grant, Edward and Lucey, John D.}, year={2020}, month={Jun}, pages={1718–1726} }