Knowledge

In the high-stakes environment of emergency medicine, the mobility of a medical stretcher can be the difference between a successful intervention and a critical delay. The HAION H491 series caster is precision-engineered for high-intensity, high-frequency medical transport, blending industrial aesthetics with advanced mechanical performance.
I. Core Design of H491
   The H491 is designed to minimize the physical strain on medical staff while maximizing transport
   speed through three critical engineering features.
   1. 8-inch Large Diameter: Overcoming Friction
       According to the rolling friction formula:
       F = f*W/R
       (where F is the required force, W is the load, and R is the wheel radius),
       an increase in wheel diameter significantly reduces the force needed to overcome obstacles.
            ◆ Performance Impact: The 8-inch (200mm) diameter reduces starting resistance by 20-30%
            compared to standard 5-inch or 6-inch wheels. This allows for effortless acceleration during
            CPR or emergency intubation transport, maintaining momentum even on uneven flooring.
   2. Red Tyre Surface: Precision Swivel Torque
       The H491 features a distinct red tyre surface rather than a flat profile.
            ◆ Agility & Smoothness: On straight paths, the arched profile minimizes ground contact.
            During 90-degree turns or navigating narrow corridors, it drastically reduces Swivel Torque,
            allowing healthcare workers to achieve "one-touch turning" with minimal physical effort.
   3. High-Strength Powder-Coated housing
        Unlike standard plastic structures, the H491 utilizes a metal housing with a premium
        powder-coated finish.
             ◆Rigidity & Stability: This provides superior torsional stiffness.
             Even when carrying heavy-duty loads exceeding 200kg, the housing resists deformation,
             ensuring all four wheels remain perfectly aligned and eliminating "snaking" during
             high-speed dashes.

II. Application Environments: From ER to Medical Imaging
    Bridging the "Medical Gap"
        Elevator thresholds often cause instability. The H491's 8-inch wheels offer a superior
        obstacle-clearance angle, preventing vibrations that can displace IV poles or sensitive
        monitors.
    Emergency Transport
        Moving patients between departments requires stability. The H491 combines
        shock-absorbing materials with high rigidity to eliminate low-frequency tremors—
        essential for protecting spinal injury or intubated patients.
    Infection Prevention & Maintenance (IPC)
        Built for harsh disinfection protocols, the powder coated finish and fully sealed dust
        covers protect the double-ball bearings from hair and debris. This robust design increases
        the MTBF by 40%.

Q1: Why 8-inch casters instead of smaller wheels?
       A: Larger wheels handle the heavy payload of patients and equipment more efficiently.
       They reduce rolling resistance and clear floor thresholds smoothly, saving critical time during
       the "Golden Hour."

Q2: Does the crowned tyre reduce stability when stationary?
       A: No. The H491’s high-performance PU material is calibrated for slight elastic deformation.
       When braked, the contact area increases to provide maximum grip and patient safety.

Q3: How does metal housing solve noise issues?
       A: By integrating precision dual ball bearings with noise-dampening materials,
       H491 ensures low-decibel movement on hard floors, supporting a "Quiet Hospital" environment.

Q4: Does it support Central Locking Systems?
       A: Yes. The H491 features a central locking linkage, allowing staff to engage
       directional locks or total brakes with a single pedal stroke for maximum efficiency.

The HAION H491 is more than just a wheel; it is a systematic solution for modern clinical logistics. For emergency units prioritizing efficiency, upgrading to the H491 represents a direct investment in clinical workflow optimization and staff ergonomics.