What is the Aethon Zena Rx?
The Aethon Zena RX is an autonomous mobile delivery robot designed specifically for hospital logistics. Manufactured by Aethon in Pittsburgh, Pennsylvania, it features four secure, lockable compartments for transporting medications, linens, meals, and medical supplies. Unlike lighter delivery robots, its 454 kg payload capacity and interchangeable carts enable heavy-duty material movement. The robot navigates via 360° LiDAR, ultrasonics, depth cameras, and an IMU, with advanced elevator integration. Launched in 2024, the Zena RX represents Aethon's latest generation of healthcare automation, building on over two decades of experience in hospital robotics.
Specifications
Here are the full technical specifications.
| Spec | Value |
|---|---|
| Height | 152.4 cm |
| Weight | 159 kg |
| Degrees of freedom | 0 |
| Battery life | 10 hours |
| Max speed | 2.74 km/h |
| Payload | 454 kg |
| Price (new) | Undisclosed (lease only) |
| Price (used range) | Not applicable |
Price & Value
New MSRP: Undisclosed (contact manufacturer for lease pricing)
Used range: Rarely available used; if available, likely 20-40% below original contract value
Aethon employs a subscription or lease model rather than direct sale, so public pricing is not available. This approach lowers upfront capital expenditure for hospitals, making the Zena RX financially accessible through operational budgets. Compared to alternatives like the Savioke Relay or Fetch Cart, the Zena RX's higher payload and purpose-built hospital design justify a premium in the logistics robot market. Depreciation is minimal in the traditional sense because the robot is typically returned at end-of-lease, but secondary-market units occasionally appear through hospital liquidations. Total cost of ownership over a 5-year lease can run into six figures per unit, but the robot often delivers ROI within 12-18 months through labor displacement and reduced error rates.
Who Is It For?
Best for: - Large hospitals and healthcare networks needing high-capacity material transport (payload 454 kg covers pharmacy, linens, meals, waste) - Facilities with multi-floor operations requiring robust elevator integration and autonomous navigation
Not for: - Small clinics or outpatient centers with low throughput and narrow corridors (robot dimensions 762x762x1524 mm require generous clearances) - Organizations seeking low-cost, lightweight delivery options (the Zena RX is a heavy-duty capital robot, not a consumer or small-business device)
Alternatives & Comparison
The hospital logistics segment features several autonomous mobile robots, each targeting specific payloads and workflows. While the Zena RX is a high-capacity workhorse, lighter or more specialized competitors offer different trade-offs.
| Model | Price | Available | Key Difference |
|---|---|---|---|
| Savioke Relay | Undisclosed | yes | Smaller 45 kg payload for lightweight hotel/hospital deliveries; not designed for heavy linens or bulk supplies |
| Diligent Robotics Moxi | Undisclosed | yes | Humanoid upper body for social interaction and light deliveries; payload only ~9 kg, suited for lab samples and pharmacy |
| Fetch Robotics Fetch Cart | Undisclosed | yes | Large payload AMR (up to 1,500 kg) for warehouses and hospitals, but lacks hospital-specific certifications (UL 3100, IEC 60601-1) |
| Vecna Robotics Vision | Undisclosed | yes | Similar payload but with bulkier frame; designed more for industrial settings, may require more integration work in tight hospital spaces |
Verdict: For pure heavy-duty hospital logistics, the Zena RX is the reference platform thanks to its purpose-built design, hospital certifications, and seamless elevator/waste management integration. However, if your facility primarily needs light item deliveries or human-robot handovers, the Savioke Relay or Moxi offer more suitable form factors and lower cost. The Fetch Cart is overkill for most hospital corridors, and the Vecna competes more in factory settings.
Use Cases & Capabilities
Pharmacy Medication Delivery
The Zena RX's four lockable compartments enable secure, auditable transport of scheduled and controlled substances from central pharmacy to nursing stations. Access is managed via PIN or badge, ensuring chain-of-custody. The robot can autonomously navigate multiple floors via elevator, eliminating the need for couriers. With a 454 kg payload, it can carry large daily medication batches, reducing delivery frequency. Integration with hospital information systems allows real-time tracking and priority routing.
Linen and Meal Distribution
Large hospitals generate high volumes of clean linens and dietary trays. The Zena RX's interchangeable carts can be pre-staged in the kitchen or laundry, then dispatched on scheduled routes. Its 10-hour battery life covers a full shift without recharging. The 360° LiDAR and sensor suite allow safe navigation amidst gurneys, visitors, and equipment. Temperature sensors in some cart configurations ensure food safety compliance during transit.
Medical Supply and Bulk Item Transport
Central stores need to supply multiple departments with bulky items such as IV bags, surgical kits, and personal protective equipment. The robot's high payload and large volume capacity (>164 liters) enable fewer trips compared to manual carts. It can be summoned on-demand or run pre-set routes during off-peak hours. Safety certifications (UL 3100, IEC 60601-1) allow operation in patient care areas without disrupting clinical workflows.
Waste and Soiled Linen Removal
Infection control is critical in healthcare. The Zena RX can be configured with sealed cart modules for collecting soiled linens and regulated medical waste. These carts lock during transit to prevent accidental contact. The robot can be scheduled for evening pickups, reducing cross-contamination risk. Its compliance with ANSI/RIA R15.08 ensures safe operation alongside staff and patients in corridors.
History & Background
Aethon Inc. was founded in 2001 in Pittsburgh, Pennsylvania, initially developing autonomous mobile robots for hospital material transport. The company's early TUG robot achieved widespread adoption in healthcare logistics. In 2017, Aethon was acquired by ST Engineering, a Singapore-based technology group, providing resources for R&D expansion. The Zena RX was officially launched on April 29, 2024, as the next-generation successor to the TUG platform. It incorporates lessons from over two decades of hospital deployments, featuring improved navigation, higher payload, and enhanced safety certifications. As of 2026, Aethon operates as a subsidiary of ST Engineering, continuing to focus exclusively on healthcare automation.
Buying Used — What to Check
Verify lease transfer terms Zena RX is typically leased; used units may require transfer of existing service contract. Ensure Aethon approves the transfer and will continue support.
Inspect battery health Battery packs degrade over 10-hour cycles. Request the battery cycle count and compare against factory specifications for expected remaining life.
Confirm compliance certifications Hospital environments require UL 3100 and IEC 60601-1 certifications. Validate that the unit's safety systems are up-to-date and not tampered with.