A Sensor and a Pump in the Same City
Most wearable clusters organize around consumer products. San Diego’s organizes around devices that go through the FDA, and that one fact explains most of what is distinctive about it.
The clearest way to see it is to notice what sits inside a single metro area. Dexcom makes the sensor that reads glucose continuously. Tandem Diabetes Care makes the pump that delivers insulin. Control-IQ, Tandem’s automated dosing algorithm, is the thing that closes the loop between them. Both halves of an artificial pancreas, plus the algorithm that joins them, are built within a few miles of each other — and Biolinq, in Sorrento Valley, is trying to make the sensing half needle-free and disposable.
| Company | San Diego role | What it does |
|---|---|---|
| Dexcom | HQ | Continuous glucose monitoring at scale — G7 and the 15-day G7, the OTC Stelo, and a next-generation sensor unveiled in 2026 with an FDA filing targeted for 2027 |
| Tandem Diabetes Care | HQ | Insulin delivery — t:slim X2 and Tandem Mobi pumps running the Control-IQ family of automated dosing algorithms |
| Biolinq | HQ | Needle-free intradermal microneedle-array glucose sensor; FDA De Novo classification for the Shine patch in September 2025 |
| ResMed | HQ | Cloud-connected devices and software for sleep apnea and chronic respiratory disease, with more than 11 million patients remotely monitored |
| Qualcomm | HQ | The silicon layer — Snapdragon W5-series wearable platforms pairing a 4 nm SoC with an always-on co-processor, plus the low-power RF underneath |
The Institution in the Middle
Clusters usually have a center of gravity that is not a company. San Diego’s is the Center for Wearable Sensors at UC San Diego, an industry-facing research center inside the Jacobs School of Engineering with roughly twenty affiliated faculty spanning electrical engineering, nanoengineering, bioengineering, and data science. It is directed by Joseph Wang and co-directed by Patrick Mercier.
Wang is a foundational figure in modern electrochemical biosensing and wearable, microneedle-based bioelectronics — one of the most-cited analytical chemists alive, with an h-index above 200 and more than 200,000 citations. The lineage matters more than the citation count. Wang advised Electrozyme, the 2012 microneedle glucose startup whose student founders went on to seed the line of work that Biolinq now commercializes. That is a fourteen-year path from a university lab bench to an FDA De Novo, and it ran entirely inside San Diego.
Mercier runs the Energy-Efficient Microsystems Lab, working the layer below the sensor: ultra-low-power integrated circuits, RF, power converters, energy harvesting, and magnetic human body communication. Between the two of them sits the core competence of the cluster — the chemistry that recognizes a molecule, and the silicon that reads it without draining a battery.
The physical infrastructure is at the Qualcomm Institute, UC San Diego’s Calit2 building, which houses nano3 — the nanofabrication cleanroom where a large share of this device work is actually fabricated. Below that sits the Institute of Engineering in Medicine, founded in 2008, an organized research unit with more than 300 faculty across some fourteen centers, which is where the clinical collaborations get formalized.
The Labs
Drew Hall runs the BioSensors & BioElectronics Group, working on CMOS integrated circuit design combined with nanotechnology for electrochemical and magnetoresistive biosensors, sensor front-ends, data converters, neural recording, and single-molecule proteomics. The group sits exactly on the boundary between chip design and biology, which is the boundary this cluster lives on.
Sheng Xu built the wearable ultrasound group at UC San Diego from 2015 onward and left for Stanford in November 2025, where he now directs emerging technologies in the medical school. The spin-offs from that group stayed behind. A cluster that exports principal investigators to other universities is doing something different from a cluster that only exports graduates — it is producing the people who go on to build the field elsewhere.
What the Cluster Is Actually Good At
San Diego is good at regulated sensing hardware: the chemistry that recognizes a molecule, the silicon that reads it at low power, the fabrication that makes it manufacturable, and the clinical pathway that turns it into a cleared product. The distance between those four things is unusually short here — a lab bench in a university cleanroom, a spin-off with a MedTech track incubator, a first customer that is also a Fortune 500 device company, and a hospital system that can run the validation study.
It is correspondingly less good at the layer above the sensor. The interpretation layer — the models, the coaching, the software that turns a signal into a decision a person acts on — is the Bay Area’s game, and nothing in this cluster’s structure pulls it toward San Diego. The companies here sell a measurement and a clinical claim; the consumer experience around that measurement is largely someone else’s business.
That is a coherent position rather than a gap. A cluster that owns the sensor and the clearance owns the part of the stack that is hardest to replicate and slowest to commoditize. It is also why the most interesting thing happening in San Diego right now is not a new wearable — it is the fourteen-year path from a university lab to an FDA De Novo, running end to end without ever leaving the county.
References
- Center for Wearable Sensors, UC San Diego. cws.ucsd.edu
- Institute of Engineering in Medicine, UC San Diego. iem.ucsd.edu
- Energy-Efficient Microsystems Lab, UC San Diego (Patrick Mercier). efficiency.ucsd.edu
- BioSensors & BioElectronics Group, UC San Diego (Drew Hall). bioee.ucsd.edu
- Qualcomm Institute, UC San Diego — nano3 nanofabrication facility. qi.ucsd.edu