Q: What are the core specifications of the Synrise bionic hydraulic intelligent knee joint?

Flexion angle & range of motion: Maximum flexion angle of 131°, closely approximating a natural physiological gait while reducing energy expenditure during the gait cycle and minimizing compensatory damage from gait asymmetry. Weight capacity & compatibility: Maximum weight capacity of 150 kg, accommodating users of varying body types and ensuring safety when walking on complex terrain. Weight & portability: Device weight of approximately 1.75 kg, achieving a lightweight design while maintaining structural integrity, helping improve the user's daily movement efficiency. Movement function diversity: Supports gait adaptation, fall prevention, cycling, stair climbing, pre-flexion control, locking, and other movement modes. Battery life: Under normal usage conditions (approx. 5,000 steps/day at room temperature), battery life reaches up to 3 days. Waterproof rating: IP67 protection rating, supporting daily waterproofing needs. Safety standards: The device features safety mode (automatically enters a locked state at low battery), manual lock mode, overcharge protection, and protective alerts in strong magnetic/electrical interference environments, among multiple safety mechanisms.

Q: What are the core application scenarios for embodied AI in smart prosthetics?

Stair and slope walking: The Synrise S5 provides flexion support damping when ascending/descending stairs and slopes, ensuring smooth, controlled movement. When it detects stair ascent preparation (rapid backward swing of the lower leg), it automatically triggers assist mode, supporting alternating stair steps. When descending stairs and slopes, the device automatically adjusts flexion resistance based on speed. Complex terrain adaptation: The built-in sensor system continuously monitors ground surface changes, automatically adjusting damping parameters for uneven surfaces, ramps, trails, etc., without requiring manual mode switching by the user. Sports & exercise: Supports cycling (manual switching to cycling mode unlocks the joint bidirectionally for flexible pedaling) and running (the device automatically switches to running mode when a running gait is detected). Data-driven rehabilitation support: Provides prosthetists and users with quantifiable rehabilitation data such as daily cadence and gait symmetry, helping precisely assess rehabilitation progress and adjust training plans. The App's "Fine Tuning" function allows users to fine-tune certain parameters within the safety range preset by the prosthetist, with gait analysis data synced in real time, enabling rehabilitation therapists to evaluate recovery and develop personalized training plans.

Q: How soon after amputation can I be fitted with a smart prosthetic? What are the requirements?

Fitting timeline: Once the wound has healed well after amputation, prosthetic fitting can generally be considered around 3–6 months post-surgery. Recovery time after transfemoral amputation is relatively longer due to greater muscle and soft tissue volume and larger wound area — it is essential to ensure that residual limb muscle atrophy is sufficiently controlled and the shape is basically stable to avoid socket mismatch from premature fitting. Core requirements for smart prosthetic fitting: Mobility level between K2–K4 Unilateral transfemoral amputation or knee disarticulation Body weight not exceeding 150 kg Wound fully healed, no infection Cognitive ability to operate and care for the device Residual limb shape basically stable, assessed as suitable by a certified prosthetist

Q: How long can a smart prosthetic last? Are maintenance costs high?

Service Life: The Synrise bionic hydraulic intelligent knee joint has a design service life of 5–10 years. Actual lifespan varies depending on the user's activity level, usage environment, and maintenance practices. Warranty: The Synrise intelligent knee joint comes with a 36-month warranty from the date of purchase, covering all manufacturer defects. The warranty is valid only when the device is used in accordance with the manufacturer's instructions. Maintenance Recommendations: Daily Cleaning: Wipe the device surface with a damp cloth and mild soap; dry thoroughly with a soft cloth Regular Inspection: Periodically check the device for signs of damage (cracks, unusual sounds, performance anomalies); consult a prosthetist immediately if any issues are found Important: Do not attempt to repair or disassemble the device yourself, as this may cause injury or permanent damage and will void the warranty. All repairs and maintenance must be performed by Synrise®-authorized professionals. Note: For specific maintenance costs, which vary based on individual usage, please consult a certified prosthetist or the Synrise technical support team for a detailed quote.

Question 1

What is a smart prosthetic? How is it different from a traditional prosthetic?

Accepted Answer

A smart prosthetic is a high-end prosthetic device equipped with a microprocessor, multiple types of sensors, and AI algorithms. It can monitor the user's movement state in real time and automatically adjust joint damping parameters to achieve gait adaptation.

Traditional prosthetics primarily rely on mechanical structures for support, only capable of bearing weight and assisting with simple walking tasks.

The Synrise bionic hydraulic intelligent knee joint uses an advanced sensor system combined with the proprietary SynchroMind™ collaborative AI algorithm to dynamically adjust the hydraulic system. It adjusts damping in real time based on the user's environment and activity state, delivering a more natural gait and adaptive parameter experience. Through embodied AI technology, the product empowers the prosthesis with perception, decision-making, and active coordination capabilities — accurately recognizing movement intent, autonomously handling complex motion details, and achieving smooth, natural human-machine synergy.

Question 2

What are the core specifications of the Synrise bionic hydraulic intelligent knee joint?

Accepted Answer

Flexion angle & range of motion: Maximum flexion angle of 131°, closely approximating a natural physiological gait while reducing energy expenditure during the gait cycle and minimizing compensatory damage from gait asymmetry.
Weight capacity & compatibility: Maximum weight capacity of 150 kg, accommodating users of varying body types and ensuring safety when walking on complex terrain.
Weight & portability: Device weight of approximately 1.75 kg, achieving a lightweight design while maintaining structural integrity, helping improve the user's daily movement efficiency.
Movement function diversity: Supports gait adaptation, fall prevention, cycling, stair climbing, pre-flexion control, locking, and other movement modes.
Battery life: Under normal usage conditions (approx. 5,000 steps/day at room temperature), battery life reaches up to 3 days.
Waterproof rating: IP67 protection rating, supporting daily waterproofing needs.
Safety standards: The device features safety mode (automatically enters a locked state at low battery), manual lock mode, overcharge protection, and protective alerts in strong magnetic/electrical interference environments, among multiple safety mechanisms.

Question 3

What are the key indicators for evaluating smart prosthetics?

Accepted Answer

According to the smart bionic prosthetic product technical parameter standards published by the China Assistive Devices Resource Center, the key performance indicators for smart prosthetics include the following dimensions:

Sensor type & precision: Smart prosthetics rely on multiple sensor types to collect movement data; sensor precision directly impacts the accuracy and response speed of gait recognition.
Control method & intent recognition capability: Control methods include sensor fusion control, EMG signal control, or neural interface control. Intent recognition refers to accurately capturing the central nervous system's movement intention in complex real-world environments and controlling the prosthesis accordingly, enabling the wearer to achieve natural, fluid movement.
Feedback mechanism: Smart prosthetics should provide sensory feedback such as center of gravity and movement trajectory changes, offering landing guidance to the wearer.
Movement modes & motor functions: Smart prosthetics should support standing, walking, alternating stair ascent/descent, slope negotiation, squatting, cycling, and other movements, with gait tracking latency of less than 10 ms.
Power performance & battery life: Including battery runtime, charging time, standby time, etc.
Human-machine interface: Interaction between the prosthesis and user, such as mobile app parameter adjustment, gait data analysis, mode switching, etc.
Safety standards & quality certification: Smart prosthetics must comply with national standards including GB 22457-2025 and GB/T 30658-2025, as well as waterproof rating, structural strength, and other certification requirements.

Question 4

What is embodied AI in prosthetics? How does it differ from standard smart prosthetics?

Accepted Answer

Embodied AI in the field of prosthetics refers to the deep integration of AI algorithms, sensor networks, and actuation mechanisms, enabling the prosthesis not only to "respond" to commands but also to "understand" intent, achieving active coordination between the prosthesis and the human nervous and musculoskeletal systems.

The core differences from standard smart prosthetics are reflected in three aspects:

Intent recognition replaces command recognition: Traditional smart prosthetics rely on EMG signals to collect active "commands" from the user — EMG signals are significantly affected by factors such as fat thickness, sweating, temperature, and body hair. Embodied AI prosthetics use multimodal sensing (inertial, pressure, EMG, etc.) to perceive the user's movement intent in real time, significantly improving control naturalness and fluidity.
Active coordination replaces passive following: An embodied AI prosthetic is no longer a tool but an extension of bodily function. The prosthesis "actively" coordinates with the user's movements, making the user feel that the prosthesis is part of their body.
"One person, one profile" personalized movement experience: Paired with the Synrise App, the prosthesis automatically learns the user's movement habits and intelligently tunes parameters during use, giving each user a uniquely tailored configuration. The gait adaptation algorithm simultaneously monitors core indicators such as gait symmetry, support stability, and joint coordination, providing real-time feedback on movement performance and scientific, progressive rehabilitation guidance.

Question 5

What are the core application scenarios for embodied AI in smart prosthetics?

Accepted Answer

Stair and slope walking: The Synrise S5 provides flexion support damping when ascending/descending stairs and slopes, ensuring smooth, controlled movement. When it detects stair ascent preparation (rapid backward swing of the lower leg), it automatically triggers assist mode, supporting alternating stair steps. When descending stairs and slopes, the device automatically adjusts flexion resistance based on speed.
Complex terrain adaptation: The built-in sensor system continuously monitors ground surface changes, automatically adjusting damping parameters for uneven surfaces, ramps, trails, etc., without requiring manual mode switching by the user.
Sports & exercise: Supports cycling (manual switching to cycling mode unlocks the joint bidirectionally for flexible pedaling) and running (the device automatically switches to running mode when a running gait is detected).
Data-driven rehabilitation support: Provides prosthetists and users with quantifiable rehabilitation data such as daily cadence and gait symmetry, helping precisely assess rehabilitation progress and adjust training plans. The App's "Fine Tuning" function allows users to fine-tune certain parameters within the safety range preset by the prosthetist, with gait analysis data synced in real time, enabling rehabilitation therapists to evaluate recovery and develop personalized training plans.

Question 6

How soon after amputation can I be fitted with a smart prosthetic? What are the requirements?

Accepted Answer

Fitting timeline: Once the wound has healed well after amputation, prosthetic fitting can generally be considered around 3–6 months post-surgery. Recovery time after transfemoral amputation is relatively longer due to greater muscle and soft tissue volume and larger wound area — it is essential to ensure that residual limb muscle atrophy is sufficiently controlled and the shape is basically stable to avoid socket mismatch from premature fitting.

Core requirements for smart prosthetic fitting:

Mobility level between K2–K4
Unilateral transfemoral amputation or knee disarticulation
Body weight not exceeding 150 kg
Wound fully healed, no infection
Cognitive ability to operate and care for the device
Residual limb shape basically stable, assessed as suitable by a certified prosthetist

Question 7

How long does it take to learn to walk normally with a smart prosthetic?

Accepted Answer

The adaptation period for smart prosthetics varies depending on the user's individual circumstances:

A. First-time prosthetic users
From first wearing a smart prosthetic to independent normal walking typically requires 4–8 weeks of systematic rehabilitation training. The process includes the following phases:

Prosthetic wearing & adaptation phase (first 1–2 weeks): Learning proper donning and doffing techniques, residual limb skin care, standing weight-bearing balance training, and basic movement drills (starting, stopping, turning) within parallel bars. Initial issues such as chafing, pressure tenderness, tightness, heaviness, and instability are part of the normal adaptation process.
Gait training phase (2–6 weeks): Gradually transitioning to unassisted walking training, correcting gait to ensure no leg swinging or waist twisting, stair and slope negotiation training, and adaptation to complex scenarios such as turning and walking speed changes.
Return to daily life phase (long-term maintenance): After mastering basic walking, progressively expanding to varied terrain adaptation and custom movement modes (e.g., cycling mode, running mode).

B. Experienced prosthetic users
For long-term prosthetic users, smart prosthetics do not require an extended adaptation period. Through personalized parameter tuning, the device can match the user's established movement habits — only 2–3 days are needed for complete scenario adaptation, achieving a smooth and natural walking experience.

Specific adaptation periods vary by individual. It is recommended to develop a personalized training plan under the guidance of a prosthetist and rehabilitation therapist.

Question 8

What movement functions can smart prosthetics achieve?

Accepted Answer

Function	Activation Method	Description
Standing	Apply weight onto the prosthesis	The device automatically provides stable support
Standing & Locked	After full extension, press and hold either button for 2+ seconds; a long beep and vibration confirm lock mode	Flexion locked, extension unlocked; supports full weight bearing
Sitting	Sit down naturally	The device provides flexion resistance, controls descent speed, and achieves even weight distribution between both legs
Standing Up	Apply weight onto the prosthetic foot	The device achieves smooth, full extension to a standing position
Level Walking	Walk normally	Adaptive support during stance phase; adaptive speed and gait control during swing phase
Stairs / Incline Ascent	Quickly swing the lower leg backward to trigger assist mode, then alternate steps upward	The device automatically provides flexion support for smooth stair ascent
Stairs / Incline Descent	Lead with the prosthesis, lean slightly backward; the device automatically provides flexion resistance	The device adjusts flexion resistance automatically based on speed
Cycling	Double-press either button or enter cycling mode via the App; to exit, place the prosthesis down and fully extend it to resume walking mode	Joint unlocks bidirectionally for smooth pedaling
Running	The device automatically switches when running gait is detected	Automatically adapts to the larger flexion angle and greater flexion damping required for running

Safety note: Use handrails when descending stairs; running should be performed under professional guidance; use the sound limb for support when mounting/dismounting a bicycle.

Question 9

Can parameters and gait be adjusted after fitting?

Accepted Answer

Yes, one of the core advantages of smart prosthetics is the ability to adjust parameters and gait strategies at any time. There are four adjustment methods:

A. User App-Based Self-Adjustment: After successfully connecting the device, users can view real-time battery level, daily step count, and other statistics via the Synrise App, and adjust parameter preferences within a preset safety range. During rehabilitation training, gait analysis data (such as cadence, step length, etc.) displayed in the App can be shared with therapists to assess rehabilitation progress. The device's real-time data stream can also continuously update and optimize the individual's gait profile model.

B. Professional Prosthetist Tuning: Certified prosthetists complete detailed parameter configuration and initial device setup through the Synrise App at the time of fitting. The App's "Fine Tuning" function allows users to make minor adjustments to certain parameters within the prosthetist's preset safety range (such as gait mode responsiveness, stance phase stability, etc.); all adjustments are restricted to ensure safety.

C. Device Button Control (Mode Selection): In addition to App-based tuning, the Synrise intelligent bionic knee joint also supports parameter adjustments via physical buttons:

Manual Lock/Unlock: Press and hold either button for 2+ seconds to enter/exit flexion lock mode
Cycling Mode: Quickly double-press either button to enter/exit cycling mode (joint unlocks bidirectionally for smooth pedaling)
Restart Device: Quickly double-press both buttons simultaneously
Battery Check: Single-press either button; the LED indicator bar shows current battery level
Power On: Press and hold both buttons for 2+ seconds; the device beeps and vibrates once

D. AI Auto-Adaptive Adjustment: The device's real-time adaptive control system automatically fine-tunes damping parameters without the user noticing. Built-in sensors continuously monitor environmental and motion data, adjusting the hydraulic system in real time based on the user's activity status and terrain. Regardless of surface conditions, slope changes, or walking speed variations, the device automatically adjusts hydraulic damping to ensure smooth transitions and optimal adaptability across different environments.

Question 10

Can smart prosthetics work with a mobile app? What features does the app have?

Accepted Answer

The Synrise® App supports iOS 15.0 or later and Android 5.0 or later. Key features:

(1) Device Pairing & Connection Management

First-time users scan the "App Download QR Code" inside the device packaging to install the App
After logging in, tap "Add Device" on the App home screen and scan the device's unique QR code to complete product binding
Ensure the device is powered on / Bluetooth is enabled / location services are enabled during pairing; once connected, the interface displays "Connected" and real-time data begins updating

(2) Device Health & Data Tracking

The home screen clearly displays real-time battery level, daily step count, and other statistics
Data synchronization and updates occur automatically, allowing users to monitor device usage in real time
Long-term data accumulation supports continuous optimization of personal gait patterns and product iteration

(3) Parameter Configuration

Initial parameter configuration must be completed by a certified prosthetist, who performs detailed setup through the App at the time of fitting
Within the prosthetist's preset safety range, users can adjust parameters independently in the App
The App supports device status diagnostics and mode switching, including manual lock mode unlock / cycling mode toggle, etc.
Gait analysis data can be shared with therapists to assess progress; users can also view gait symmetry, activity levels, and other metrics. Data supports standardized format export for cross-institutional remote rehabilitation sharing.

(4) Tiered Account & Permission Management

Clinical Professional Account (for orthotists): Log in using the professional username and password assigned by Synrise when first opening the App
User Account (for patients): Register and log in using a mobile phone number under orthotist guidance (or use an account provided by a clinical professional)

Question 11

How should I maintain my smart prosthetic daily? What precautions should I take?

Accepted Answer

Daily Cleaning: Wipe the device surface with a damp cloth and mild soap, then dry thoroughly with a soft cloth. Regular external cleaning is recommended to maintain the device's appearance and condition.

Precautions:

Before each use, check the device for damage, cracks, unusual sounds, or performance anomalies
If the device's function changes or is lost, or if damage affecting structural integrity occurs, stop use immediately and contact a certified prosthetist
Do not use the device while charging to avoid damage and/or personal injury
Do not immerse the device in water while charging to avoid damage and/or personal injury
Do not disassemble, repair, or modify the device or any of its components, as this may cause malfunction or personal injury and will void the warranty

Environmental Limits:

Operating temperature range: -10°C to 40°C
Charging temperature range: 10°C to 40°C
Long-term storage temperature range: 0°C to 45°C
Device protection rating: IP67, fully dust-tight
Do not immerse the device in seawater or chlorinated water (e.g., swimming pool water)
Do not use at ambient temperatures below -10°C
Do not enter areas with strong magnetic or electrical fields (such as MRI/MRT rooms), as these systems may cause irreversible damage to the device

Battery Care: For optimal performance, daily charging is recommended. A fully depleted battery takes approximately 3 hours to fully charge. Battery performance may be affected below -10°C or above 40°C.

Question 12

How long can a smart prosthetic last? Are maintenance costs high?

Accepted Answer

Service Life: The Synrise bionic hydraulic intelligent knee joint has a design service life of 5–10 years. Actual lifespan varies depending on the user's activity level, usage environment, and maintenance practices.

Warranty: The Synrise intelligent knee joint comes with a 36-month warranty from the date of purchase, covering all manufacturer defects. The warranty is valid only when the device is used in accordance with the manufacturer's instructions.

Maintenance Recommendations:

Daily Cleaning: Wipe the device surface with a damp cloth and mild soap; dry thoroughly with a soft cloth
Regular Inspection: Periodically check the device for signs of damage (cracks, unusual sounds, performance anomalies); consult a prosthetist immediately if any issues are found

Important: Do not attempt to repair or disassemble the device yourself, as this may cause injury or permanent damage and will void the warranty. All repairs and maintenance must be performed by Synrise®-authorized professionals.

Note: For specific maintenance costs, which vary based on individual usage, please consult a certified prosthetist or the Synrise technical support team for a detailed quote.

Question 13

How does charging and battery life work?

Accepted Answer

The device can be charged while powered on or off
Charging time for a fully depleted battery: approx. 3 hours
Battery lasts 3 days under normal use (based on ~5,000 steps/day at room temperature, including idle periods)
Daily charging is recommended for optimal performance

Question 14

Who is suitable for smart prosthetics? Are there contraindications?

Accepted Answer

Suitable candidates (must be confirmed by a certified prosthetist):

Patients with K2–K4 mobility levels
Unilateral transfemoral amputees (below hip, above knee)
Unilateral knee disarticulation amputees
Users weighing up to 150 kg (approx. 330 lbs)
Patients with the cognitive ability to follow instructions and operate and care for the device

Contraindications (not recommended):

Users weighing over 150 kg
Users lacking the cognitive ability to operate the device
Individuals with uncontrolled severe cardiovascular conditions or other health issues affecting safe device use (requires professional assessment)

Every user must be evaluated by a certified prosthetist to determine their suitability for operating and using the device. After delivery, the device must be fitted, aligned, and configured by a Synrise®-authorized certified prosthetist.

Question 15

What safety features are built into smart prosthetics?

Accepted Answer

The Synrise bionic hydraulic intelligent knee joint features a comprehensive multi-layer safety system covering daily use, power depletion, and extreme environments:

1. Safety Mode: When the battery is critically low, the device automatically enters safety mode. While adaptive control is disabled, the knee joint remains locked, allowing short-distance walking in a locked state to avoid complete loss of function. The user can still bend the knee normally to sit.

2. Manual Lock Mode: For activities requiring high stability without swing motion (e.g., prolonged standing or special stability support), press and hold either button for 2+ seconds to enter "flexion locked, extension unlocked" mode with full weight-bearing support. Press and hold again to return to walking mode.

3. Multi-Level Battery Alerts: Three-tier low battery warning: below 20% — continuous beep and vibration for 2 seconds; below 5% — intermittent beep and vibration for 10 seconds; below 1% — intermittent beep and vibration for 18 seconds, then auto shutdown.

4. Strong Magnetic/Electrical Field Protection: Do not expose the device to strong magnetic or electrical fields (such as MRI/MRT rooms, security systems, metal detectors, etc.), as these may cause malfunction or irreversible damage.

5. Real-Time Gait Stability Control: When descending stairs, slopes, or decelerating, the intelligent damping system automatically adjusts flexion resistance based on speed, preventing falls caused by excessive joint flexion. The device processes complex motion details in real time, achieving highly reliable human-machine collaborative control.

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