When people think about surgical robotics, they often imagine what they can see: robotic arms, motors, instruments, and mechanical precision.
But one of the most critical parts of a surgical robot is invisible.
Software is what transforms a collection of mechanical, electronic, and optical components into a system capable of assisting a surgeon during one of the most delicate procedures in medicine.
At AcuSurgical, where LUCA is being developed for retinal surgery, software is far more than code. It is part of the surgical instrument itself.
The invisible intelligence behind the robot
A surgical robot does not simply move because a surgeon moves. Between the surgeon’s hand and the robotic instrument, software is constantly interpreting, calculating, checking, and coordinating.
It captures the surgeon’s intention, translates it into robotic motion, communicates with the system’s different components, and continuously monitors that everything remains within safe operating conditions.
As one AcuSurgical software engineer explains: “The hardware brings the force; the software brings the intelligence, control and safety.”
This is why software is often described by the team as the “brain” of the robot. It is also the connection point between every part of the system: control, user interface, robotic arms, sensors, tests, logs, and safety mechanisms.
Without it, even the most sophisticated hardware cannot become a surgical device.
“Without software, we only have sophisticated sculptures.”
A software-first philosophy
Behind all of this sits a deliberate design principle at AcuSurgical: if not necessary, don’t reinvent the wheel in hardware.
Where a challenge can be solved either mechanically or in software, the instinct is to solve it in software. Proven mechanical components are used where they already do the job well, rather than reengineering them from scratch. The intelligence, the differentiation, and the hardest problems are pushed into software.
There are solid engineering reasons for this.
Software is faster. A mechanical revision can mean new parts, new tooling, and new manufacturing cycles. A software revision can be designed, tested, and validated far more quickly – so the system evolves at the pace of what surgeons actually need.
Software brings flexibility and agility. The same hardware platform can gain new capabilities and refinements without being physically rebuilt. What the robot can do is not frozen the day the hardware is finished.
And, perhaps counterintuitively, doing more in software makes the system more reliable and easier to service. Fewer bespoke mechanical parts means fewer things to wear, fail, or adjust in the field. Behavior becomes more predictable, updates simpler, and maintenance cleaner.
None of this is a shortcut. Every software-driven choice is still specified, tested, verified, documented, and traced to the same medical-grade standard as any other part of the system. The goal is not to do less – it is to put the engineering effort where it creates the most value, safely.
Mechanics where they are truly needed. Software wherever it can do the job better.
Why retinal surgery makes software especially demanding
Retinal surgery raises the bar for every engineering discipline involved.
The retina is extremely fragile. The surgical workspace is tiny. Movements can be measured in microns. In this environment, precision alone is not enough. The system must also be responsive, reliable, predictable, and safe.
For software engineers, this creates a very specific challenge: combining real-time performance with medical-grade safety.
The system must react immediately to the surgeon’s actions while continuously verifying that every movement remains controlled. It must support the surgeon’s gesture without adding complexity. It must contribute to comfort and performance, while never compromising patient safety.
“In surgery, there is no second chance. We have to prove, not just believe, that the system will behave correctly whatever happens.” – Acusurgical’s Software Engineer
This sentence captures what makes medical software different from ordinary software. A feature is not finished when it works. It must be specified, implemented, tested, verified, documented, and traceable.
What happens when the surgeon moves?
A simple movement from the surgeon triggers a complex chain of events.
The control interface captures the gesture. The software interprets the command. Control algorithms calculate the appropriate response. Commands are sent to the robotic motors. The instrument moves. At the same time, the system continues to monitor the action and verify that it remains aligned with the expected behavior.
This happens continuously.
The robot is not simply copying a movement. It is receiving, interpreting, adapting, executing, and checking.
“We translate the surgeon’s gestures into machine language so that the robot can perform the same operation in a safer way.”
That translation is at the heart of surgical robotics. Software connects human intention to robotic precision.
The work nobody sees
For many people, software is what appears on a screen. For the engineers building medical devices, much of the most important work remains invisible: testing, verification, code consolidation, documentation, traceability, regulatory requirements, and quality processes.
“For a feature visible for a few seconds on screen, there are often weeks of invisible testing and validation. That is what separates a prototype from a true medical device.”– Acusurgical’s Software Engineer
This invisible discipline is essential. In surgical robotics, software engineering is not only about innovation. It is about rigor.
The team describes the most important skills as curiosity, problem-solving, pragmatism, humility, teamwork, and above all, rigor. Because in a medical device, every detail matters.
One system, many disciplines
Surgical robotics is one of the most multidisciplinary fields in engineering.
Software must work closely with mechanical engineering, electronics, systems engineering, clinical teams, product, quality, and regulatory experts. A decision in one area can influence the entire system.
This is why the software cannot be treated as a separate layer added at the end. It must be designed as part of the complete medical device.
In a surgical robot, excellence does not come only from excellent components. It comes from making every component work together safely, reliably, and coherently.
The robotic arm may be what people notice first.
But software is what gives it intelligence.
It connects the surgeon’s intention to the robot’s movement. It coordinates, verifies, adapts, and secures every action. It turns precision mechanics into a surgical partner.
At AcuSurgical, the Software Team is not simply writing code.
They are helping shape how surgeons and robots may one day work together during some of the most delicate procedures in medicine.