The human body is one of the most complex machines ever created, making it equally challenging to fix when things don’t go as planned. Navigating the inner workings of biological and chemical processes in the human body for patient treatment is a tedious task requiring a nuanced approach. The engineering methodology has yielded a new framework for medical intervention, critical care, and the potential for life saving procedures to be conducted at scales and conditions that modern day medical devices are currently unable to operate in.
This article will cover the ongoing developments in nanotechnology for medical applications, focusing on the engineering implications and their significance to the design process of medical nanodevices. There are several foundational engineering principles being used in the development of medical nanotechnology; sensors, actuation, control systems, fluid mechanics and materials are key components of the design process in this context, implementing techniques normally used in large-scale machinery and infrastructure at the nano-scale.
Proximity sensors can help with identifying the vasculature that the devices travel through by detecting the distance between the nanobot and walls of the structure (veins, arteries, capillaries) as well as changes such as inflammatory responses, blockages and plaque buildup (Weerarathna et al., 2025; Patrick, 2025). This ensures that the devices operate in the correct environment and allows them to back track should there be an instance where they do not follow their intended path (Patrick, 2025). Ultrasonic sensors detect high frequency sound waves that can be programmed to output an image, similarly to ultrasound technology, capable of producing high fidelity imaging of tumors, cancer cells, and potentially blood clots in early stages of formation (Weerarathna et al., 2025; Patrick, 2025).
These same sensors, when calibrated correctly, give these small-scale devices the ability to move against blood flow gradients and resist motion when performing a procedure to remain in place (Weerarathna et al., 2025). This also ties into control systems, where AI algorithms interpret data input from onboard sensors to make calculated decisions, assess the risk of a procedure, adapt to environmental changes such as blood pressure, and change course in case of restricted pathways (Patrick, 2025).
Flow rates and derived equations from fluid mechanics make motion feasible, facilitating the design of nano motors and cell-like protrusions (flagellum) through mathematical models of the environment within the biological structures of the body, while also making considerations of the chemical make-up of fluids (blood, plasma, saliva etc) through live density calculations and thermal efficiency (Weerarathna et al., 2025).
Lastly, the selective choice of materials for construction of nanodevices is crucial to the early testing stages of these devices. Biocompatibility is directly affected by material selection, making it essential to focus on organic structures constructed using carbon, metals, proteins, DNA, and biopolymers to minimize disruption of processes in the body (Arvidsson & Hansen, 2020; Weerarathna et al., 2025). This in turn makes it more feasible to remove the devices once their function has been fulfilled, either through a chemical identification tag or through a programmed degradation (Arvidsson & Hansen, 2020).
All of these factor into the design process directly to optimize the devices for their specific environments and respective functions, allowing them to navigate through harsh conditions for prolonged period of time, and carry out a wide range of functions in a medical context. This exciting field of biomedical engineering shows promise in treating severe medical conditions, some which are currently untreatable, through minimally invasive nonsurgical techniques, drug delivery, and many more possibilities.
Arvidsson, R., & Hansen, S. F. (2020). Environmental and health risks of nanorobots: an early review. Environmental Science: Nano, 7(10), 2875–2886. https://doi.org/10.1039/D0EN00nan570C
Induni Nayodhara Weerarathna, Kumar, P., Dzoagbe, H. Y., & Kiwanuka, L. (2025). Advancements in Micro/Nanorobots in Medicine: Design, Actuation, and Transformative Application. ACS Omega, 10(6). https://doi.org/10.1021/acsomega.4c09806
Patrick, G. (2025, November 12). Can Medical Nanobots Really Navigate the Human Body? The Future of Nanorobotics in Healthcare. Science Times. https://www.sciencetimes.com/articles/60753/20251111/can-medical-nanobots-really-navigate-human-body-future-nanorobotics-healthcare.htm