Telemedicine ENT · technical, design & network

Twenty years of telemedicine and video conferencing

Getting an operating theatre onto a network, live, without a single re-take — and keeping it there since 2006.

Alongside the clinical and research record there is an engineering one. Since 2006 the studio in Utrecht has been the technical backbone for LION’s international live surgical education broadcasts: operations carried from theatre to an audience of surgeons in real time, across hospital networks that were never designed to carry them. Two decades without a broadcast season missed, and the work has three named strands, all still active.

20yr

Years of continuous live broadcasting

Unbroken since 2006

2006

Studio operating since

Global Telemedicine Studios, Utrecht

Protocols bridged in one call

H.323 · SIP · Zoom, through an MCU

The three strands

Technical

Live surgical broadcasting end to end: multi-camera vision mixing, microscope and endoscope feeds, theatre audio, encoding, recording and distribution. Plus the laboratory instrumentation the research rested on.

Broadcast · AV · instrumentation

Design

Digital design and build: information architecture for medical and scientific content, multilingual site structures running to several hundred pages, performance budgets, accessibility, and the measurement stack that tells you whether any of it worked.

Information design · build · measurement

The broadcasts

Public live surgical productions, the studio’s own channel archive, and the photographs of the set they came out of.

Video & photo archive · open it

Network

Firewall and routing design, protocol interoperability between hospital videoconferencing and cloud platforms, traversal, priority for latency-sensitive streams, and contingency planning for networks nobody lets you reconfigure.

Routing · firewalls · interoperability

Technical work

theatre to network

Live surgical broadcasting

A LION broadcast puts an operation in front of surgeons who would otherwise never see the case, free to the viewer. It is not a camera on a tripod: it is multi-camera vision mixing with microscope and endoscope feeds, theatre audio, surgeon commentary, and moderated questions travelling back into the room while the operation continues. The studio in Utrecht has anchored that chain since 2006.

Role: Technical manager, Telemedicine ENT
Since: 2006
Network: LION

interoperability

Video conferencing & multipoint

Hospital video estates are H.323 and SIP; the audience is on Zoom. Bridging the two is the practical problem of medical broadcasting, and it is solved with MCU-based multipoint bridging, gateway configuration and production switching through vMix — not by asking either side to change its equipment. Endpoint interoperability, codec negotiation, echo and latency management, and a fallback path for every leg of the call.

Protocols: H.323 · SIP · Zoom
Bridging: MCU multipoint
Production: vMix vision mixing

a network you do not control

Networking

Hospital networks are hostile to live media, and they are not yours to reconfigure. The engineering is in getting deterministic behaviour out of them anyway: firewall and routing design on MikroTik, NAT and port traversal for H.323 and SIP, priority for latency-sensitive streams, redundant uplinks, and a rehearsed contingency for the leg that fails on the day — because one of them will.

Firewall & routing: MikroTik
Traversal: NAT · H.323 · SIP
Resilience: QoS · redundant uplinks

a fixed point in the chain

The studio

Global Telemedicine Studios in Utrecht: encoding, mixing, graphics, recording and distribution in one facility, so that a broadcast originating in any theatre in any country still passes through a constant, known point. Running continuously since 2006.

Facility: Utrecht
Operating since: 2006
Function: Encode · mix · record · distribute

information, not decoration

Digital design & build

The second strand is design: not styling, but deciding what a reader needs to know and in what order, then building it so it loads fast, reads on a phone and survives translation. The clinical estate runs to several hundred pages across three languages, hand-built as flat static files with no framework and no third-party tracking — a deliberate choice for privacy and for pages that still work in ten years. Behind it sits a measurement stack that reports whether a change actually helped, rather than whether it looked better.

Discipline: Information architecture
Built as: Static, no framework, no trackers
Measured with: Own analytics and search-console pipeline

before the broadcasts

Instrumentation & measurement

The engineering did not start with video. It started with measurement rigs: NI DAQ hardware and LabVIEW for laboratory data acquisition, behind a first-author series built entirely on physical quantities — airflow and pressure characteristics of tracheostoma valves, aerodynamic and sound-intensity measurement in tracheoesophageal voice, vocal efficiency, and an efficiency comparison of four heat-and-moisture exchangers. Three-dimensional tracheostoma models were produced by stereolithography in 1995.

Acquisition: NI DAQ · LabVIEW
Measured: Airflow, pressure, sound intensity
Earliest: 1995

Because it is the same instinct. The research programmes are built on measured quantities — thermal and acoustic effects of a surgical laser, intracochlear sound pressure behind a dehiscence, threshold shift after a festival. The broadcast work is that discipline applied to a signal path instead of a cochlea: characterise it, instrument it, and design for the failure you can predict.

It is also what made the teaching possible. A surgical technique described in a journal is not a surgical technique you have watched. Twenty years of broadcasts exist because somebody was willing to treat the network as an engineering problem rather than an obstacle.

Live surgery video archive The studio in pictures Teaching at a distance Evidence & method