All-in-One Veterinary
Warming + Grounding Mattress
No Sticky Pads. No Shaving.
The U501V combines active underbody warming with capacitive return electrode functionality for compatible monopolar electrosurgery — eliminating the need for a separate adhesive return electrode pad and dedicated shave site. It also acts as a pressure-reduction pad.
See How the Warming + Grounding Mattress Works
The U501V has two independent connections: one for active underbody warming and one for return electrode functionality. This video shows the basic setup, cable connections, patient positioning, and compatibility checkpoints before use.
HOW IT WORKS
Two Functions. One Mattress.
Designed with veterinarians in mind, the U501V simplifies your setup by combining safe, conductive warming with a built-in capacitive return electrode.
No dedicated shave site. No adhesive return electrode pad. One reusable surface underneath the patient.
Air-Free Underbody Warming
Low-voltage DC current flows through the ThermAssure™ conductive fabric, generating uniform heat across the patient-facing surface.
The U501V connects to the WC77V Controller through the blue A112 Mattress Cable and reaches setpoint from room temperature in less than 10 minutes.
The WC77V continuously monitors the connected warming device and stops warming if readings move outside safe operating parameters.
Radiolucent heater fabric supports X-ray use. Position the busbars and sensor area outside the imaging field when possible.
Capacitive Return Electrode
The large-surface mattress acts as a neutral electrode, safely collecting monopolar ESU current and returning it to the generator. No adhesives or extra preparation.
Connects via the green A136 cable. Compatible with single or dual ESU setups (use A137 Y-cable for dual generators). May require adapter cable.
Capacitive return electrode technology has been used safely in over 100 million human surgical procedures.
A BETTER RETURN ELECTRODE WORKFLOW
Skip the Shave. Skip the Sticky Pad.
Traditional adhesive return electrodes require a suitable placement site and may require clipping or shaving fur to achieve appropriate pad contact.
With the U501V, the patient lies directly over a large-area capacitive return electrode. For compatible patients and ESU setups, there is no dedicated return-electrode shave site and no adhesive pad to apply or remove.
No Dedicated Shave Site
Less patient preparation before surgery and no fur removal solely for return electrode placement.
No Adhesive Return Pad
No adhesive pad placement, removal, or disposal between cases.
One Underbody Device
The same mattress provides active warming and return electrode functionality.
RETURN ELECTRODE TECHNOLOGY
A Large-Surface Return Path Under the Patient
During monopolar electrosurgery, high-frequency current travels from the active electrode through the patient and must return to the electrosurgical generator.
Instead of collecting that current through a small adhesive return electrode attached to the skin, the U501V uses the large surface underneath the patient as a capacitive return electrode.
Adequate patient contact with the mattress is essential for effective capacitive coupling.
PATIENT SIZE GUIDANCE
Return Electrode Use by Patient Weight
Safe capacitive coupling requires at least 4 nanofarads of capacitance — approximately 120 cm² of patient-body contact on the mattress surface. Patient weight is a practical guide, but actual body contact should always be assessed. Verify before each procedure.
| Zone | Patient Weight | Expected Pad Contact | Recommendation |
|---|---|---|---|
| Green | ≥ 5 kg (≥ 11 lb) | Torso + limbs cover ≥ 65% of pad | Proceed as normal |
| Yellow | 2–5 kg (4.4–11 lb) | Aim for ≥ 50% coverage; spread all limbs | Use low-to-moderate ESU power. If cutting feels weak — improve contact before raising power. |
| Red | < 2 kg (< 4.4 lb) | Contact area < ~120 cm² | Do not use U501V as return electrode. Switch to adhesive pad or bipolar technique. |
Note: Avian, reptile, and exotic species have lower effective capacitance due to feathers, scales, or narrow body profiles — treat as one weight category smaller than body weight alone suggests.
setup overview
Ready in Three Steps
1
Position the Mattress
Position the U501V on the surgical table with appropriate non-conductive layer between the mattress and any metal surface. Place a thin barrier (under 0.8 mm — a drape or bed sheet) between the mattress and patient. Maximize patient contact: spread all limbs and tail across the surface.
2
Connect Warming
Align the red dots and push the blue A112 cable into the mattress connector, then into a blue port on the WC77V controller. Listen for the beep — it confirms the safety monitoring system is active.
3
Connect to ESU
Connect the green A136 cable from the mattress to your ESU return electrode port. If your ESU uses CQM, REM, NEM, or Nessy monitoring, the A138 adapter may be required. Power on and confirm the ESU recognizes the return electrode.
Cables and Adapters
For active warming, the U501V connects to the WC77V Temperature Management Controller using the A112 Mattress Cable. For return electrode use, the U501V connects to a compatible monopolar electrosurgical generator using the A136 Return Electrode Cable. Both functions can operate simultaneously, or the return electrode can be used independently without the WC77V controller.
The A17 Y-Cable and A138 Adapter may be required depending on your ESU configuration.
Warming · Required
A112
Blue Mattress Cable
5 m (16.4 ft)
Grounding · Required
A136
Return Electrode Cable
4 m (13.1 ft)
Dual ESU · If Needed
A137
Dual Generator “Y” Cable
Two ESU connections
Adapter · If Needed
A138
REM Adapter Cable
For CQM, REM, NEM, Nessy ESUs
Get U501V Pricing & Confirm Your Setup
Our team can help you:
- Confirm ESU compatibility
- Identify required cables and adapters
- Select the right warming and grounding configuration
- Receive a facility-specific quote
Prefer to order directly?
Request Pricing and Info
Why the U501V
Simpler Setup. Less Waste. No Shaving.
No Shaving
No sticky pads, no skin prep, no burn risk from loose adhesive contact.
Reusable for 2 years
One U501V replaces over 2,000 single-use return electrode pads across its 24-month lifespan based on four procedures per day. Lower per-procedure cost, dramatically less disposable waste.
85.7% normothermia
Iowa State University RCT (Ayers and Riedesel, n=28) showed 85.7% normothermia with HotDog conductive warming above and below vs. 14.3% with forced-air above the patient and circulating water below.
One Operating Room setup
One device connects to both the WC77V and your ESU simultaneously. Less table clutter, faster patient positioning, fewer cables to manage between cases.
Built-in Safety Monitoring
The WC77V continuously monitors the mattress and stops operation if patient warming functionality leaves safe parameters. Error codes E1, E2, E4, and E8 identify specific issues and guide resolution. Refer to your electrosurgical generator IFU for related safety features.
Water-resistant and Easy to Clean
Fully sealed seams and a water-resistant surface make routine wipe-downs possible in under 30 seconds. Compatible with approved disinfectants. Follow the disinfectant manufacturer’s required contact time and drying instructions.
REUSABLE AND ENVIRONMENTALLY FRIENDLY
One Mattress. Hundreds of Procedures.
Every adhesive return electrode is used once and discarded.
The U501V is reusable until its labeled expiration date, allowing the same return electrode surface to support repeated procedures while also providing active patient warming.
A reusable return electrode means fewer disposable adhesive pads entering the waste stream after every monopolar electrosurgery procedure.
Illustrative two-year comparison based on four procedures per day, five days per week, and 52 weeks per year, assuming one disposable return electrode and one forced-air underbody warming blanket per procedure.