Application of Communication Servo in Medical Equipment

AC servo systems rely on high-precision positioning, high dynamic response, and stable speed/torque control capabilities and high reliability , and are widely used in medical devices. Medical devices require extremely high precision, safety, and stability in motion control, and the characteristics of AC servo systems perfectly match these needs. The following are typical application scenarios:

1. Surgical and minimally invasive treatment equipment

Surgical equipment demands the strictest requirements for motion precision and stability, with AC servo systems as the core control unit:

Surgical robots (such as the Da Vinci surgical robot): The end effectors of the robotic arm (such as surgical forceps and suturing needles) need to simulate the surgeon's hand movements and eliminate hand tremors (precision at the 0.1mm level). AC servo motors achieve high-precision position tracking through closed-loop control, combined with the low backlash characteristics of reducers, ensuring smooth and responsive robotic arm movements to meet the needs of delicate operations (such as suturing and dissection) in minimally invasive surgery.
Laparoscopic / endoscopic equipment The rotation, extension, and angle adjustment of the lens must be precisely controllable to avoid accidental damage to tissues. The low-speed smoothness (no creeping) and high repeat positioning accuracy (±0.01mm) of AC servo systems ensure stable alignment of the lens with the surgical area.

2. Diagnostic imaging equipment

Imaging equipment requires precise motion control to ensure image clarity and consistency:

CT scanners The rotation speed of the scanning frame (usually 30-60 revolutions per minute) must be stable, and the rotation angle must be precisely controlled (error <0.1°) to avoid image blurring. The high-speed stability and position closed-loop control capability of AC servo systems meet this requirement.
Magnetic Resonance Imaging (MRI) The patient bed's translation requires high precision (error <0.5mm) and absolute smoothness during movement (to avoid vibration interference with the magnetic field). The low-speed smoothness (no pulsation) and low noise characteristics of AC servo systems are suitable for MRI environments.
X-ray machines The angle adjustment of the radiation source and detector (such as the rotation of a C-arm machine) requires fast response and precise positioning to ensure accurate irradiation angles. The high dynamic response (acceleration time <100ms) of AC servo systems enables rapid posture switching.

3. Rehabilitation and physiotherapy equipment

Rehabilitation equipment needs to adjust motion parameters in real time according to the patient's condition, and the torque/speed closed-loop control capability of AC servo systems is key:

Rehabilitation robots (such as lower limb exoskeletons): They need to match the patient's gait and adjust joint torque in real time (such as assistance or resistance) to avoid secondary injury to the patient. The high-precision torque control (error <2%) and fast feedback (response time <50ms) of AC servo systems enable dynamic adaptation.
Electric therapy beds Multi-axis movements (such as headboard lifting and bed surface rotation) need to be smooth and impact-free, with precise adjustable position ranges (such as angle control ±0.5°). The smooth motion characteristics and position memory function of AC servo systems enhance patient comfort.

4. Laboratory and testing equipment

Laboratory equipment requires precise motion to ensure operational accuracy:

Fully automatic biochemical analyzers The aspiration and release of sample and reagent needles require high-precision positioning (error <0.1mm), and adjustable motion speed (to avoid liquid splashing). The high repeat positioning accuracy and speed adjustability (0-300mm/s continuously adjustable) of AC servo systems meet these needs.
Centrifuges The rotor speed must be stable (such as high-speed centrifuges with speed error <0.5%), and the start-stop process must be smooth (to avoid sample stratification disturbance). The speed closed-loop control of AC servo systems (real-time feedback via encoder) ensures stable speed.

5. Hospital beds and nursing equipment

Electric hospital beds Movements such as headboard/tailboard lifting and overall translation need to be smooth (to avoid jolting the patient) and have overload protection (automatic stop when encountering obstacles). The torque limiting function and low-speed smoothness of AC servo systems enhance safety.

Special requirements for AC servo systems in medical scenarios

Safety Must have fault self-diagnosis (such as overcurrent and overvoltage protection), emergency stop functions (compliant with IEC 61508 safety standards) to prevent equipment loss of control.
Compatibility Non-magnetic servo motors must be used in strong electromagnetic environments (such as MRI) to avoid magnetic field interference; waterproof and dustproof designs (IP65 or above) are required in clean environments (such as operating rooms).
Low noise Operating noise must be less than 50dB (to avoid disturbing patient rest or equipment detection).

In summary, AC servo systems, through high-precision and highly stable motion control, have become the core technological support for medical devices to achieve "precise operation and safety reliability," promoting the development of medical devices toward intelligence, minimally invasive procedures, and humanization.

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