When I first walked into the biomedical engineering lab at San Jose State, I thought I was there to build a robot. Six months later, I realized I was there to understand healing. The project was straightforward on paper: design a six-axis robotic arm capable of delivering dielectric barrier discharge (DBD) plasma therapy to wound surfaces. Plasma therapy accelerates healing by promoting cell regeneration and killing bacteria without antibiotics. The catch? You need to maintain a precise distance from the wound — too close and you risk thermal damage, too far and the treatment loses efficacy.
The Precision Problem
My first prototype was embarrassingly imprecise. We're talking centimeter-level errors. For context, the therapeutic window for DBD plasma is measured in millimeters. I was building a system that could hurt people. That realization changed everything. Suddenly, this wasn't an engineering challenge — it was a moral one. Every design decision had stakes beyond performance metrics.
Integrating LiDAR and Thermal Imaging
The breakthrough came when I stopped thinking about the arm as a positioning system and started thinking about it as a sensing system. By integrating LiDAR for surface mapping and infrared thermal imaging for real-time feedback, we could adapt to the wound's actual geometry rather than relying on pre-programmed paths. The final system achieved a mean positional error of 0.027mm with a maximum error of 0.069mm. That's not just engineering — that's the difference between healing and harm.
What Robotics Taught Me About Medicine
Medicine isn't just about understanding biology. It's about delivering interventions with precision, consistency, and safety. Robots don't get tired. They don't have off days. They can maintain sub-millimeter accuracy for hours. But robots also can't improvise. They can't notice when something looks wrong. The future of biomedical robotics isn't about replacing human judgment — it's about augmenting human capability with machine precision. I went in thinking I'd learn about servo motors and inverse kinematics. I came out understanding why precision matters when someone's health is on the line.