纺织类器械的性能指标怎么定

结论：指标要对应功能，而纺织品的数据对条件特别敏感

医疗器械中的纺织类产品很多——手术衣、隔离衣、口罩、敷料、绷带、束带、坐垫面料、床单被服。

这类产品的指标选择有两个要点：

指标要对应功能。 阻隔类产品测阻隔、吸收类产品测吸收、支撑类产品测强度和弹性，而不是一律测拉伸强度。

数据对条件敏感。 纺织材料的性能受含湿量、温度、取样方向、试样尺寸的影响很大，条件不控制，数据就不可比。

产品类型与指标

「落絮」在手术环境相关的产品上是特有指标，脱落的纤维在手术野中是异物。

强度相关的指标

拉伸强力与伸长。 基础指标，注意经纬向分别测。

撕破强力。 一旦起裂后的抗撕裂能力，对使用中可能受尖锐物作用的产品重要。

胀破强力。 对针织类和非织造类适用。

接缝强力。 缝制产品的接缝是薄弱点。

耐磨。 反复摩擦下的损耗。

「接缝强力」常常低于面料本身的强力，所以整体的强度往往由接缝决定，只测面料不测接缝，结论不完整。

阻隔相关的指标

抗渗水性。 静水压下的阻水能力。

抗合成血液穿透。 在规定压力下的阻血能力。

抗微生物穿透。 干态和湿态的微生物阻隔。

颗粒过滤效率。 对过滤类产品。

「湿态的微生物阻隔」比干态更严苛，因为液体可以成为微生物穿透的通道，而实际使用中面料常常是湿的。

舒适相关的指标

透气性。 空气通过的能力。

透湿量。 水蒸气的透过能力。

热阻与湿阻。 综合反映穿着舒适。

柔软度与手感。 主观感受可以部分量化。

「透气与阻隔」是一对矛盾 ——阻隔好的材料往往不透气，而不透气意味着穿着闷热，长时间使用的依从性下降。

试样处理的要求

纺织品测试对试样处理的要求高：

状态调节。 在规定温湿度下平衡规定时间，这是必须的步骤。

取样位置。 避开边缘和疵点，覆盖不同位置。

取样方向。 经向、纬向分别取样，标注方向。

试样数量。 纺织品的分散性较大，需要足够的试样数。

试样尺寸。 按方法规定，尺寸影响结果。

成品还是面料。 对成品的评价应当用成品试样，含接缝和处理。

「状态调节」如果省略，数据会有明显偏差，因为纺织材料的强度随含湿量变化，同一块布在不同湿度下测出的强度可能差别明显。

与使用的对应

测试条件与使用条件的关系。 实验室条件与实际使用条件的差异。

单次使用还是重复使用。 重复使用的产品要考虑耐洗涤。

灭菌的影响。 灭菌后的性能保持。

老化。 储存期间的性能变化。

实际的受力方式。 测试的加载方式是否代表实际。

「耐洗涤」对可重复使用的纺织品是关键 ——反复洗涤和消毒后，强度、阻隔、阻燃性能都可能下降，应当做规定次数洗涤后的性能复测。

阻燃相关

燃烧性能。 点燃后的燃烧行为。

阻燃的持久性。 后整理型阻燃在洗涤后可能失效。

组合试样。 面料加填充材料的组合，单独测面料不代表组合。

洗涤后的阻燃复测。 对可重复使用产品必要。

「阻燃在洗涤后失效」是实际问题，因为多数阻燃通过后整理获得，而整理剂在反复洗涤中流失。

常见的准备不足

信息不全。 材料、工艺、使用环境的信息缺失，导致方案设计缺乏依据。

样品不具代表性。 试制样品或挑选样品，与量产状态有差距。

条件未明确。 测试条件没说清楚，数据的适用范围就不明确。

只看初始值。 忽略了环境和时间作用后的性能变化。

项目不完整。 遗漏了必要的项目，提交时才发现。

这五项在实际委托中出现频率较高，建议在项目启动时逐项确认，因为它们造成的返工成本远高于事前确认所花的时间。

数据的组织与保存

记录的完整性。 条件、方法、设备、样品状态、实测值。

可追溯性。 数据与样品批次、生产批次的关联。

保存期限。 覆盖产品的生命周期。

检索的便利。 需要时能快速定位。

版本的管理。 数据更新时的版本控制。

建议建立统一的数据台账，记录每组数据的来源、条件、适用范围和有效期。数据积累起来之后，后续的产品开发和变更评估都能受益。

与整体工作的衔接

这部分工作不是孤立的，它与几项内容相关：

与设计的衔接。 数据是设计决策的依据，也是设计验证的证据。

与风险管理的衔接。 识别出的风险点应当有对应的验证。

与变更管理的衔接。 变更时判断是否需要重新验证。

与生产控制的衔接。 关键参数的控制限值来自验证数据。

与售后的衔接。 失效分析需要原始数据作为对照。

建议在项目规划时就把这些衔接关系理清楚，避免各环节各做各的、数据无法互相支撑。

我们的做法

做纺织类产品测试时，我们严格按规定做试样的状态调节，并经纬向分别取样——这两点做不到位，数据就不具可比性。

对成品的评价我们用成品试样，包含接缝和实际的处理工艺，因为接缝强度往往低于面料强度。

对于可重复使用的产品，洗涤循环后的性能复测是我们建议的项目，特别是阻隔和阻燃，因为这两项在洗涤后的衰减是实际存在的。

如果你有纺织类器械需要确定性能指标和测试方案，可以把产品类型和使用方式发过来一起讨论，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. Textile products are numerous among medical devices: surgical gowns, isolation gowns, masks, dressings, bandages, straps, upholstery fabrics and bed linen. Two points govern the selection of performance measures. Measures must correspond to function: barrier products need barrier testing, absorbent products need absorption testing, and supporting products need strength and elasticity testing, rather than measuring tensile strength universally. And data are sensitive to conditions, since textile properties depend strongly on moisture content, temperature, sampling direction and specimen size; without condition control, data are not comparable.

Products and their measures. Surgical and isolation gowns provide barrier and require liquid barrier, microbial barrier, linting and strength. Masks provide filtration and require filtration efficiency and breathing resistance. Dressings manage exudate and require absorption, moisture transmission and adherence. Bandages compress and secure and require tensile properties, recovery and applied pressure. Straps and restraints carry load and require strength, seam strength and retention. Upholstery fabrics protect and provide comfort and require flammability, abrasion resistance, breathability and cleaning tolerance. And bed linen serves hygiene and requires strength, laundering durability and flammability. Linting is a measure specific to products used in surgical environments, since shed fibres are foreign bodies in the surgical field.

Strength measures. Tensile strength and elongation are the basic measures, taken separately in warp and weft directions. Tear strength covers resistance to propagation once a tear starts, mattering for products that may encounter sharp objects. Bursting strength applies to knitted and nonwoven materials. Seam strength matters because seams are the weak point in made-up products. And abrasion resistance covers loss under repeated rubbing. Seam strength is commonly below fabric strength, so overall strength is usually governed by seams, and testing fabric without seams leaves the conclusion incomplete.

Barrier measures. Hydrostatic resistance covers water barrier under pressure. Synthetic blood penetration resistance covers blood barrier at specified pressure. Microbial penetration resistance covers barrier both dry and wet. And particulate filtration efficiency applies to filtering products. Wet microbial barrier is more demanding than dry, since liquid provides a path for penetration and fabrics are frequently wet in real use.

Comfort measures. Air permeability covers the passage of air. Moisture vapour transmission covers the passage of water vapour. Thermal and evaporative resistance together reflect wearing comfort. And softness and handle can be partly quantified from subjective impression. Breathability and barrier pull against one another: materials with good barrier tend not to breathe, and poor breathability means heat and discomfort in wear, reducing compliance over long periods.

Specimen preparation. Textile testing places high demands on specimen preparation. Conditioning at specified temperature and humidity for a specified period is a mandatory step. Sampling location should avoid edges and defects and span different positions. Sampling direction should take warp and weft separately with direction marked. Specimen numbers must be adequate, since textile variability is considerable. Specimen size must follow the method, since size affects results. And finished product rather than fabric should be used where the finished product is being evaluated, including seams and treatments. Omitting conditioning produces noticeably biased data, since textile strength varies with moisture content and the same fabric can measure appreciably differently at different humidities.

Correspondence with use. Consider the relationship between test and service conditions. Consider whether the product is single-use or reusable, since reusable products need laundering durability. Consider the effect of sterilisation on property retention. Consider ageing during storage. And consider the actual loading, meaning whether the test's loading mode represents reality. Laundering durability is critical for reusable textiles: strength, barrier and flammability performance can all decline after repeated washing and disinfection, and performance should be re-measured after a specified number of cycles.

Flammability. Burning behaviour covers what happens after ignition. Durability of flame retardance matters because finish-applied treatments may fail after laundering. Composite specimens of fabric over filling should be used, since fabric alone does not represent the assembly. And re-testing flammability after laundering is necessary for reusable products. Loss of flame retardance after laundering is a real problem, since most flame retardance comes from finishing treatments that deplete through repeated washing.

How we handle it. For textile testing we condition specimens strictly as specified and sample warp and weft separately; without both, data are not comparable. For finished product evaluation we use finished-product specimens including seams and actual processing, since seam strength is generally below fabric strength. For reusable products we suggest re-measuring performance after laundering cycles, barrier and flammability especially, since decline in both after washing is real.

Send us the product type and manner of use and we will discuss the measures and test programme. Phone or WeChat: +86 132 4819 8029.