@article{mohammadbagherpoor_muth_grant_2023, title={A Modular Endoscopic Tool and Laser Ablation Test-Bed for Studying Biological Tissue Ablation Control Strategies}, volume={5}, ISSN={["2576-3202"]}, DOI={10.1109/TMRB.2023.3309947}, abstractNote={Robotized laser endoscopic tools provided surgeons with increased accuracy for ablating tissue. Here, a new modular endoscopic laser scanner system test-bed was designed and fabricated for conducting experiments into control strategies. This new system used a continuous wave (CW) laser system specifically designed for the task. Experiments into biological tissue ablation with this new system were compared with experiments previously conducted using a pulsed laser system. The torque required to accurately position the light beam of the flexible fiber optic cable was derived by solving Maxwell’s equations. The new test-bed again included a photo-detector sensor, which was used to position the laser beam on the tissue and provide closed-loop feedback control. With this arrangement, laser beam tracking errors were shown to be smaller than in the original pulsed laser experiments, and the tissue ablation patterns were repeatable. Trials on biological tissue (chicken meat) with this new physical test-bed proved that the tissue ablation pattern experiments were consistent, robust, and accurate. A COMSOL simulation of heat propagation then showed that consistency between the experimental and the simulation results. It also gave indicators for additional test-bed design changes that are required for optimizing the control of laser beam/biological tissue ablation.}, number={4}, journal={IEEE TRANSACTIONS ON MEDICAL ROBOTICS AND BIONICS}, author={Mohammadbagherpoor, Hamed and Muth, John and Grant, Edward}, year={2023}, month={Nov}, pages={811–818} }
 @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 photodetector sensor. The scale of this new device was governed by the dimensions of the photodetector 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 preclinical trials, the physical experimental results showed that the designed prototype laser scanner system accurately tracks 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 <inline-formula><tex-math notation="LaTeX">$\text{50}\ \mu$</tex-math></inline-formula>m resolution at distances of less than <inline-formula><tex-math notation="LaTeX">$\text{8 mm}$</tex-math></inline-formula>, and of <inline-formula><tex-math notation="LaTeX">$\text{100}\ \mu$</tex-math></inline-formula>m resolution at a distance of <inline-formula><tex-math notation="LaTeX">$\text{15 mm}$</tex-math></inline-formula>. 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} }