输液泵与注射泵送检要点

结论：精度和报警是这类设备的两条主线

输液泵和注射泵的功能是按设定的速率把液体输入人体。它的安全性建立在两件事上：输得准，以及出问题时能报警。

输不准的后果直接。 流速偏高可能造成过量给药，偏低可能达不到治疗效果。对于高危药物，偏差的后果可能很严重。

报警的作用是在异常时中断输注并提示。 管路阻塞、气泡、输液完毕、电池低电量，这些情况如果没有报警，使用者可能长时间不知情。

所以送检项目虽然多，但重点围绕这两条主线。

项目的组织

「防自由流」是这类设备特有的关键项。 管路从泵体中取出或泵门打开时，如果没有保护，液体可能在重力作用下自由流入，造成快速大量给药。

流速精度的考察

测试方法。 通常用称重或量筒法测量实际输出量，计算与设定值的偏差。

速率范围。 在整个可设定范围内验证，特别是低流速。低流速的相对误差通常更大，而临床上低流速常用于高危药物。

短时与长时。 短时间内的瞬时偏差与长时间的累计偏差是两回事，都要看。

启动特性。 从静止到稳定输注的过渡，这段时间的输出量偏差。

背压的影响。 不同背压下的流速变化。实际输注中管路末端有一定压力。

耗材的影响。 不同批次、不同品牌管路对流速的影响。

温度的影响。 环境温度对液体粘度和泵机构的影响。

「低流速下的精度」是重点。 很多设备在中高流速下表现良好，低流速时偏差明显，而新生儿用药、某些高危药物恰恰使用低流速。

「启动特性」也容易被忽略。 有些泵在启动初期存在输出滞后或者过冲，这段时间的给药量与设定不符。

阻塞报警的考察

报警阈值。 触发报警的压力值，以及是否可调。

报警时间。 从阻塞发生到报警发出的时间。这个时间与流速相关——低流速下压力上升慢，报警时间可能很长。

不同流速下的报警时间。 应当在多个流速下测量。

压力释放（防推注）。 阻塞解除时，管路中积累的压力可能造成一次性推注。设备应当有释放机制。

报警的可靠性。 不应漏报也不应频繁误报。

「低流速下的阻塞报警时间」是临床关注的问题。 以很低的速率输注时，阻塞后压力上升需要很长时间才能达到报警阈值，这期间患者实际上没有得到药物。这一项应当实测并在资料中说明。

气泡检测的考察

检测能力。 能检出多大的气泡、累积气泡的检测。

误报的控制。 对气泡以外的干扰（管路位置、液体性质）是否误报。

报警后的行为。 停止输注、报警提示。

不同管路的适配。 检测器对不同规格管路的适应性。

「累积气泡」的检测值得关注。 单个小气泡可能不触发报警，但持续的小气泡累积起来量就不小了。

其他安全功能

剂量限制。 单次剂量和时间段内累计剂量的限制。

参数设置的防误。 输入错误参数时的拦截，比如小数点错位。

药物库。 如果有药物库功能，其设置的正确性和防篡改。

多通道的独立性。 多通道设备中，一个通道的异常不应影响其他通道。

停电保护。 停电时停止输注并报警，恢复后不应自行继续。

「参数设置防误」是减少用药错误的实际措施。 设定速率时小数点输错一位，剂量相差十倍，设备应当能识别明显超出常规的设定并提示确认。

基本性能的定义

输注设备的基本性能通常包括：

输注速率的准确性在规定范围内；不发生意外的过量输注；报警功能有效；以及停止功能有效。

「不发生意外的过量输注」应当明确写入。 这是这类设备风险较大的失效模式，抗扰度测试的判定准则中要包含这一条。

送检准备的建议

提供配套耗材。 声称适配的管路、注射器各规格都要送。

说明适配范围。 哪些品牌规格的耗材可用。

提供参数设置说明。 各项参数的范围与设置方法。

提供报警配置说明。 各报警的阈值、优先级、可调范围。

提供基本性能定义与判定准则。

准备足够样品与耗材。 精度测试消耗的耗材量不小。

「耗材的适配范围」要说清楚。 不同品牌管路的内径和弹性不同，流速精度可能差别明显，声称适配的都应当验证。

多通道与联合使用

临床中常有多台泵同时用于一位患者，这带来额外的考虑：

通道间的独立性。 多通道设备中一个通道的异常不影响其他通道。

电磁兼容中的相互影响。 多台设备靠近使用时的相互干扰。

共用管路时的相互影响。 多路输注汇入同一静脉通路时，压力的相互作用。

报警的区分。 多台设备同时报警时，能否分辨是哪一台。

堆叠使用的稳定性。 多台泵堆叠或装在支架上时的机械稳定性。

「共用管路时的相互影响」是临床上的实际问题 ——一路阻塞后压力升高，可能影响另一路的输注，甚至造成回流。

与耗材的配合

耗材对性能的影响需要专门验证：不同批次管路的流速差异；管路使用时长对流速的影响（长时间受压后弹性变化）；注射器品牌差异对推注精度的影响；以及管路安装方式的影响。

「管路长时间受压后的弹性变化」会导致流速漂移，对长时间输注的场景影响明显，建议验证。

我们的做法

承接输注设备委托时，我们会在低流速段多测几个点，因为这是精度问题较集中的区间，也是临床上风险较高的使用场景。

阻塞报警方面，我们建议在多个流速下测量报警时间，并把低流速下的报警时间明确给出 ——这个数据对临床使用有直接参考价值，而只给一个报警压力阈值说明不了实际的报警延迟。

如果你有输注类设备需要安排送检，想先理清项目和耗材准备，可以把产品资料发过来一起讨论，或者直接联系：132 4819 8029。能力范围见服务介绍，送检要求见送检要求，流程见检测流程。

English version

Conclusion. Infusion and syringe pumps deliver fluid into the body at a set rate, and their safety rests on two things: delivering accurately, and alarming when something goes wrong. Inaccurate delivery has direct consequences: too fast risks overdose, too slow fails to achieve the therapeutic effect, and for high-risk drugs the consequences of deviation can be serious. Alarms interrupt infusion and warn when something is abnormal: occlusion, air, infusion complete and low battery would otherwise go unnoticed for long periods. The test programme is long, but it centres on these two lines.

Organising the items. Electrical safety covers leakage current, dielectric strength, earthing, temperature rise and single fault conditions. Applied parts cover classification and isolation. Electromagnetic compatibility covers emissions and immunity. Flow accuracy covers correctness and stability across rates. The alarm system covers occlusion, air, completion, fault and battery. Occlusion items cover alarm thresholds, alarm time and pressure release. Free-flow protection covers what happens when the set leaves the pump. Battery testing covers endurance, changeover, charging and indication. Mechanical and environmental testing covers drop, vibration, temperature, humidity and ingress protection. And consumable compatibility covers sets and syringes. Free-flow protection is the item specific to these devices: when the set is removed or the door opened, unprotected fluid can flow freely under gravity and deliver a large dose rapidly.

Examining flow accuracy. Testing generally measures actual delivered volume by gravimetric or volumetric means and computes deviation from the setting. Verify across the whole settable range, low rates especially, since relative error is generally larger at low rates and clinical practice uses low rates for high-risk drugs. Examine short-term and long-term behaviour separately, since instantaneous deviation over a short interval and cumulative deviation over a long one are different things. Examine start-up characteristics, covering the transition from rest to steady delivery and the volume deviation during it. Examine the effect of back pressure, since the distal end of a real set carries pressure. Examine the effect of consumables, since set batches and brands affect flow. And examine temperature effects on fluid viscosity and pump mechanism. Low-rate accuracy is the focus: many devices behave well at moderate and high rates and deviate noticeably at low ones, while neonatal dosing and certain high-risk drugs use precisely those low rates. Start-up is also easily overlooked: some pumps lag or overshoot at the beginning, so that the dose delivered during that period differs from the setting.

Examining occlusion alarms. Examine the alarm threshold, meaning the pressure that triggers it and whether it is adjustable. Examine the alarm time from occlusion to alarm, which relates to flow rate, since pressure rises slowly at low rates and the alarm time may be long. Measure alarm time at several rates. Examine pressure release, since pressure accumulated in the set during occlusion can deliver a bolus when the occlusion clears and the device should release it. And examine alarm reliability, which should neither miss nor alarm spuriously. Alarm time at low rates concerns clinicians: infusing at a very low rate, pressure takes a long time to reach the threshold after occlusion, and during that period the patient receives nothing. Measure it and state it in the documentation.

Examining air detection. Examine detection capability, covering the bubble size detected and detection of accumulated air. Examine control of false alarms, meaning whether disturbances other than air, such as set position or fluid properties, trigger alarms. Examine behaviour after alarming, covering stopping infusion and warning. And examine compatibility with different sets. Accumulated air deserves attention: a single small bubble may not trigger an alarm while a succession of small bubbles accumulates into a significant volume.

Other safety functions. Dose limits cover single-dose and cumulative limits over a period. Setting error protection covers interception of incorrect input, such as a misplaced decimal point. Drug libraries, where fitted, require correct configuration and protection against tampering. Channel independence in multi-channel devices requires that one channel's fault does not affect others. And power failure protection requires stopping infusion and alarming, without resuming automatically on restoration. Setting error protection is a practical measure against medication error: a decimal point misplaced by one position changes the dose tenfold, and the device should recognise settings clearly outside the usual range and ask for confirmation.

Defining essential performance. For infusion devices this typically covers accuracy of delivery rate within the specified range; absence of unintended over-delivery; effectiveness of alarms; and effectiveness of the stop function. Write in the absence of unintended over-delivery explicitly: it is the higher-risk failure mode for these devices and belongs in the acceptance criteria for immunity testing.

Preparing for submission. Provide the matching consumables, submitting every size of set and syringe claimed as compatible. State the compatibility range, meaning which brands and sizes may be used. Provide parameter setting details covering ranges and methods. Provide alarm configuration details covering thresholds, priorities and adjustable ranges. Provide the essential performance definition and acceptance criteria. And prepare enough samples and consumables, since accuracy testing consumes a considerable quantity. State the consumable compatibility range clearly: sets from different brands differ in internal diameter and elasticity, flow accuracy can differ noticeably, and everything claimed as compatible should be verified.

How we handle it. For infusion devices we measure at several points in the low-rate region, since that is where accuracy problems concentrate and where clinical risk is higher. On occlusion alarms we suggest measuring alarm time at several rates and stating the low-rate alarm time explicitly, since that figure bears directly on clinical use, whereas a pressure threshold alone says nothing about the actual delay.

Send us the product documentation and we will work through the items and consumables. Phone or WeChat: +86 132 4819 8029.