上下肢训练设备的安全保护

结论：使用者可能无法自我保护，保护必须由设备承担

康复训练设备与健身器材在外形上有相似之处，但安全设计的前提完全不同：

健身器材的使用者身体功能正常，遇到异常可以自己停下、松手、跳开。

康复训练设备的使用者可能肌力不足、感觉障碍、认知受限、或者有痉挛。 遇到异常时可能无法松手、无法发力停止、甚至感觉不到疼痛。

所以保护不能依赖使用者的反应，必须由设备主动承担。 这是两类产品在安全设计上的根本差别。

风险的来源

风险	场景
过度牵拉	运动范围超出关节承受能力
力矩过大	阻力或驱动力超出肢体承受
痉挛对抗	使用者痉挛而设备继续驱动
夹挤	肢体或衣物卷入运动部件
固定件失效	手脚固定装置脱开
跌落	从座位或站立位失去支撑
皮肤损伤	固定件压迫或摩擦
疲劳过度	训练超出耐受而使用者未表达

「痉挛对抗」是被动训练设备的核心风险。 使用者出现痉挛时肢体僵硬，如果设备按预定轨迹继续驱动，肢体承受的力可能造成损伤。

保护措施的层次

第一层，机械限位。 运动范围由机械结构限制，即使控制失效也不会超出。这是最可靠的一层。

第二层，力矩或力的限制。 超过设定值时设备停止或让步。可以是机械式（离合、弹性元件）或电气式（电流监测）。

第三层，控制层保护。 软件监测异常并停止。

第四层，急停。 使用者或治疗师可触及的急停装置。

第五层，人员监护。 训练过程中有人在场。

层次的可靠性从上到下递减，所以关键保护应当尽量放在靠前的层次。只靠软件监测的保护，在控制系统故障时会失效。

各项保护的验证

机械限位。 验证限位的强度（能否承受设备全力冲击）和位置的可调性。

力矩限制。 验证动作阈值的准确性和响应时间。要在多种工况下验证 ——不同速度、不同位置的阈值可能不同。

痉挛检测与响应。 模拟突然的阻力增加，验证设备是否及时停止或让步。这一项是被动训练设备的关键验证。

急停功能。 验证急停后设备的行为——是立即停止还是缓慢停止，停止后肢体是否处于安全位置，能否手动解除。

固定装置。 手脚固定件的强度、快速解除、以及接触面的压力。

断电行为。 停电时设备应当停止并能手动解脱肢体，不应把使用者锁在设备中。

防夹设计。 运动部件的间隙评价，防止肢体或衣物卷入。

「断电后能否手动解脱」是必须验证的项目。 如果停电后使用者的手脚被固定在设备上无法取出，这是严重的安全缺陷。

被动训练模式的特殊考虑

被动模式下设备驱动肢体运动，使用者不主动发力。这带来几个特殊要求：

运动范围必须可精确设定。 并且设定后可靠保持。

范围设定应当便于治疗师操作。 复杂的设定过程容易出错。

速度应当可调且下限足够低。 初期训练需要很慢的速度。

阻力反馈要灵敏。 遇到异常阻力时快速响应。

渐进启动。 避免启动时的冲击。

记录功能。 记录实际完成的运动范围和次数，便于评估训练效果。

「范围设定的可靠保持」值得强调，因为设定漂移会导致实际运动范围超出治疗师的设定，而使用者可能无法表达不适。建议验证多次运行后的范围一致性。

主动与助力模式

主动模式下使用者发力，设备提供阻力或助力。相关的验证包括：

助力的响应。 使用者发力意图的检测和助力的跟随，延迟过大会影响训练效果和使用者感受。

阻力的准确性。 与训练处方相关。

模式切换的安全性。 从被动切换到主动时不应出现突变。

力的方向。 助力方向错误会造成对抗。

说明书与培训

这类设备的资料应当包括：适用人群与禁忌；治疗师的操作培训要求；训练参数的设定方法；异常情况的处理；固定装置的正确使用；每次使用前的检查；以及紧急情况的处置步骤。

「禁忌」这一项要写清楚。 某些状况的使用者不适合使用这类设备，含糊的表述会导致误用。

固定装置的设计

手脚固定装置直接接触肢体，设计上要兼顾可靠和安全：

固定力度。 够牢固以保证训练效果，又不能过紧造成压迫或影响循环。

接触面。 面积足够、有衬垫、压力分布均匀。感觉障碍的使用者无法反馈压迫感，这一点尤其重要。

快速解除。 紧急时能快速解开，包括断电情况下。

尺寸适配。 适应不同肢体尺寸，调节范围要明确。

清洁。 可拆卸清洗或便于擦拭消毒。

材料。 与皮肤长时间接触，生物相容性方面要考虑。

「感觉障碍使用者无法反馈」是这类设备设计的重要前提。 健康人会因为不适而调整，感觉障碍者不会，所以压迫造成的损伤可能持续到造成实质伤害才被发现。

训练过程的监护

设备设计应当支持监护：

参数可见。 治疗师能随时看到当前的角度、阻力、次数。

异常提示。 出现异常时有明显提示。

可随时介入。 治疗师能随时停止或调整。

使用者的示意方式。 表达能力受限的使用者如何示意不适，可以考虑简单的按钮或其他方式。

这几项虽然不是传统意义上的「安全功能」，但它们决定了异常情况能否被及时发现。

我们的做法

做训练设备的安全验证时，我们会重点验证保护功能的实际动作，而不是核对设计文件是否写了这些功能。 具体做法是人为制造异常工况——突加阻力、模拟痉挛、断电——看设备的实际响应。

另外，「断电后能否手动解脱肢体」是我们必查的项目，因为这一项的后果严重而实际中被遗漏的情况不少。

如果你有训练类设备需要安排安全验证，想先理清验证项目，可以把产品资料和训练模式发过来一起讨论，或者直接联系：132 4819 8029。检测能力见服务介绍，产品分类见手动轮椅检测与电动轮椅检测，标准信息见标准查询。

English version

Conclusion. Rehabilitation training equipment resembles fitness equipment in form, but the premises of its safety design differ entirely. Users of fitness equipment have normal physical function and can stop, let go or step away when something goes wrong. Users of rehabilitation equipment may lack muscle strength, have sensory impairment or cognitive limitation, or experience spasticity, and may be unable to let go, unable to generate force to stop, or unable to feel pain. Protection therefore cannot rely on the user's reaction and must be provided actively by the equipment. That is the fundamental difference in safety design between the two.

Sources of risk. Excessive stretch occurs when the range of movement exceeds what the joint can tolerate. Excessive torque occurs when resistance or driving force exceeds what the limb can bear. Spasticity opposition occurs when the user spasms while the equipment continues to drive. Entrapment occurs when a limb or clothing is drawn into moving parts. Fixation failure occurs when hand or foot restraints release. Falling occurs on loss of support from a seat or standing position. Skin injury occurs through pressure or friction from restraints. And overexertion occurs when training exceeds tolerance and the user cannot say so. Spasticity opposition is the core risk in passive training equipment: when the limb stiffens and the equipment continues along its programmed path, the forces imposed on the limb can cause injury.

Layers of protection. First, mechanical limits restrict the range of movement structurally, so that it cannot be exceeded even if control fails; this is the most reliable layer. Second, torque or force limiting stops or yields above a set value, implemented mechanically through clutches or compliant elements, or electrically through current monitoring. Third, control-layer protection detects abnormality in software and stops. Fourth, emergency stop provides a device reachable by user or therapist. Fifth, supervision means someone is present during training. Reliability decreases down the list, so critical protection should sit as high as possible; protection resting on software monitoring alone fails when the control system does.

Verifying each protection. Mechanical limits are verified for strength, meaning whether they withstand the equipment's full force, and for adjustability. Torque limiting is verified for threshold accuracy and response time, across several conditions, since thresholds may differ with speed and position. Spasticity detection and response is verified by simulating a sudden increase in resistance and confirming that the equipment stops or yields promptly; this is the key verification for passive equipment. Emergency stop is verified for behaviour afterwards, whether stopping is immediate or gradual, whether the limb is left in a safe position, and whether manual release is possible. Fixation devices are verified for strength, quick release and contact pressure. Power failure behaviour is verified so that the equipment stops and the limb can be freed manually, never leaving the user locked in. And anti-entrapment design is verified by assessing gaps at moving parts to prevent limbs or clothing being drawn in. Manual release after power failure must be verified: a user whose hands or feet remain fixed to the equipment after an outage represents a serious safety defect.

Passive mode considerations. In passive mode the equipment drives the limb and the user exerts no force, which brings particular requirements. Range of movement must be precisely settable and reliably held once set. Setting must be convenient for the therapist, since complex procedures invite error. Speed must be adjustable with a low enough minimum, since early training needs very slow movement. Resistance feedback must be sensitive, responding quickly to abnormal resistance. Starting must be gradual, avoiding shock. And recording functions should log the range and repetitions actually achieved, to support evaluation. Reliable retention of the range setting deserves emphasis, because drift lets actual movement exceed what the therapist set while the user may be unable to report discomfort. Verify range consistency after repeated operation.

Active and assisted modes. In active mode the user generates force and the equipment provides resistance or assistance. Verification covers assistance response, meaning detection of the user's intent and how closely assistance follows, since excessive delay affects both training effect and how the equipment feels. It covers resistance accuracy, which relates to the training prescription. It covers safety of mode switching, with no abrupt change when moving from passive to active. And it covers force direction, since assistance in the wrong direction opposes the user.

Documentation and training. Documentation should cover the intended population and contraindications, therapist training requirements, how to set training parameters, handling of abnormal situations, correct use of restraints, pre-use checks, and emergency procedures. State contraindications clearly: certain conditions make these devices unsuitable, and vague wording leads to misuse.

How we handle it. In safety verification we concentrate on whether protective functions actually operate rather than on checking that the design documentation lists them. In practice we create abnormal conditions deliberately, applying sudden resistance, simulating spasm and interrupting power, and observe what the equipment does. Manual release of the limb after power failure is an item we always check, because the consequences are serious and it is frequently overlooked.

Send us the product information and training modes and we will scope the verification. Phone or WeChat: +86 132 4819 8029.