Telesurgery — a surgeon operating a robot on a patient hundreds or thousands of kilometers away — went from a single 2001 proof-of-concept between New York and Strasbourg to a defined, latency-gated clinical technology by 2026, with China's Toumai system racking up more than 100 human procedures while the United States only completed its first FDA-approved telesurgical case, a transcontinental operation between Florida and Angola, in 2025. This closes out the surgical robot series with the most technically demanding application of the technology: doing surgery when the surgeon and patient aren't even in the same country.
The Latency Threshold That Makes or Breaks Telesurgery
Telesurgery lives or dies on one specific technical number: the round-trip delay between a surgeon's hand movement at the console and the robot's corresponding motion at the patient's side. Research consistently shows that latency below 100 milliseconds preserves the hand-eye coordination surgeons rely on, while delays exceeding 150 to 200 milliseconds significantly impair surgical precision — a risk that gets more acute specifically in dual-cockpit setups where two surgeons might be coordinating remotely. Japan's 2022 Remote Surgery Guidelines (JSS-RSG) codified this into a formal requirement: end-to-end latency of 100 milliseconds or less, combined with a secure closed-network architecture and built-in redundancy, before any remote procedure can proceed clinically.
China's Toumai: The Volume Leader
Shanghai MicroPort's Toumai system, covered in the previous entry of this series, has become the platform with by far the largest real-world telesurgery track record, with more than 100 human procedures completed — described in published research as the largest series of telesurgical robotic procedures reported anywhere. The technology's early results show real technical progress: an ultra-long-distance case between Shanghai and Xinjiang, spanning roughly 5,000 kilometers, was completed with latency above 310 milliseconds — well above the ideal threshold, but still clinically successful. A later trial covering that same roughly 5,000-kilometer distance using standalone 5G networking achieved a median one-way latency of just 73 milliseconds with zero packet loss, a meaningful technical improvement over just a few years. Toumai's dual-console design, letting the surgeon's console sit either at the patient's location or entirely remote, along with being the only platform specifically approved for telesurgery in Europe as of recent research, has positioned it as the clear volume leader in this specific application.
The International Firsts of 2024 and 2025
Beyond China's domestic volume, several genuine international milestones landed in quick succession. A Bordeaux-to-Beijing partial nephrectomy in 2024 achieved 132 milliseconds of latency across 8,264 kilometers, demonstrating clinical feasibility at true intercontinental scale. Belgium hosted the first European clinical telesurgery using the Toumai system, a robot-assisted radical prostatectomy performed remotely between two centers 25 kilometers apart. The most significant regulatory milestone came in 2025, when the United States completed its first telesurgical procedure under formal FDA approval — a transcontinental operation between Florida and Angola, marking American regulators' first clinical green light for the technology after years of the US trailing China's case volume. A Brazilian public health system (SUS) pilot study, meanwhile, recorded a median 5G latency of just 32.4 milliseconds, comfortably below the threshold shown to affect surgical precision.
Does It Actually Work Clinically?
Beyond the latency engineering, the clinical safety data is genuinely reassuring so far. A prospective controlled trial comparing telesurgical and local robotic-assisted radical prostatectomy using the Toumai and Edge robotic systems found no conversions from remote to local surgery were needed at all, with average delay times of 65, 34, and 61 milliseconds across urological, general, and gynecological procedures respectively. Critically, the study found no statistically significant differences in blood loss, intraoperative complications, or postoperative outcomes between local surgery, remote telesurgery, and standard da Vinci Xi surgery — meaning the added distance and network dependency didn't measurably worsen patient outcomes in this trial. A separate randomized 5G telecholecystectomy trial and a prospective single-arm remote gastrectomy trial published in 2026 reported similarly stable performance and successful completion rates, adding to a genuinely growing body of positive feasibility evidence across multiple procedure types and countries.
What Still Needs to Be Solved
Network reliability remains described as the literal foundation of telesurgery's future — a single dropped connection or latency spike during a procedure carries real safety consequences that don't exist in conventional surgery. The first Telesurgery Consensus Conference, held in Orlando in February 2024, brought together international experts specifically to work through the ethical and technical questions the field still hasn't fully settled: cross-border liability when a surgeon in one country operates on a patient in another, credentialing and licensing across jurisdictions, and standardized minimum network requirements that different countries are still independently defining (Japan's 100-millisecond mandate is stricter than what some other trials have operated under). Telesurgery's genuine promise — extending specialist surgical expertise to underserved or remote regions without requiring a patient to travel — remains real and increasingly demonstrated in controlled trials, but the regulatory and ethical scaffolding needed for routine, everyday clinical use is still being actively built alongside the technology itself.
Telesurgery Milestones at a Glance
| Milestone | Distance | Latency | Year |
|---|---|---|---|
| First telerobotic surgery (New York-Strasbourg) | Intercontinental | Not specified in early reports | 2001 |
| Shanghai-Xinjiang (Toumai, early trial) | ~5,000 km | >310 ms | Pre-2024 |
| Bordeaux-Beijing partial nephrectomy | 8,264 km | 132 ms | 2024 |
| ~5,000 km trial with standalone 5G (Toumai) | ~5,000 km | 73 ms (median) | 2025-2026 |
| First US FDA-approved telesurgery (Florida-Angola) | Transcontinental | Not specified in available reports | 2025 |
Frequently Asked Questions
How much delay can telesurgery tolerate before it becomes unsafe?
Research shows round-trip latency below 100 milliseconds preserves hand-eye coordination, while delays exceeding 150 to 200 milliseconds significantly impair surgical precision. Japan's 2022 guidelines formally require 100 milliseconds or less for clinical telesurgery.
Which country has performed the most telesurgery procedures?
China leads by volume, with its domestically developed Toumai system completing more than 100 human telesurgical procedures, described in published research as the largest such series reported anywhere.
Has the US performed a telesurgery procedure yet?
Yes. The United States completed its first telesurgical procedure under formal FDA approval in 2025, a transcontinental operation between Florida and Angola.
Is telesurgery actually safe based on clinical trial data?
Early evidence is encouraging. A prospective controlled trial found no conversions from remote to local surgery were needed, and no statistically significant differences in blood loss, complications, or outcomes compared to standard local robotic or da Vinci surgery.