YY/T 0853-2011Medical compression hosiery for varices (English PDF)

3.1 Compression

The pressure that is applied on legs by compression hosiery.

3.2 Compression classes

The classes that are conducted for compression hosiery according to the compressive force generated by ankle.

3.3 Custom made hosiery

The compression hosiery that is specially made for a patient and suits his/her leg size.

3.4 Durability

The ability of maintaining its nominal compressive force of compression hosiery, after repeated washing and dressing procedure in simulation.

3.5 Extensibility

The maximum extent of compression hosiery stretching to leg laterally (circumferentially) or vertically (leg length direction) under the test procedures specified in this Standard, represented by percentage accounting for compression hosiery specifications in un-stressing condition.

3.6 Course

A row of coils that are arranged transversely in fabric.

3.7 Medical compression hosiery for varices

The compression hosiery that applies a certain of compressive force on legs in a bottom-up and gradual decreasing way, so as to treat leg veins and / or lymphatic disease.

Note: It is referred as "compression hosiery" for short in this Standard.

3.8 Practical elongation

The elongation in the transverse direction of hosiery on legs, represented by percentage of the difference between the marked circumference and the un-stretching circumference accounting for the un-stretching circumference.

3.9 Pressure profile

The representation of compressive force of compression hosiery, applied along leg direction.

3.10 Residual pressure

The compressive force at some point, represented by the percentage

5.1 General principle

Compression hosiery specification of human leg length and circumference shall be marked at the measuring points given in Figure 1 and Table 2.

5.2 Length measurement

When necessary, each length shall be measured based on the codes given in Table 3.

5.3 Circumference measurement

When necessary, each circumference shall be measured based on the codes given in Table 4.

5.4 Specification

Note: For easy use of compression hosiery and reference for test methods stipulated in this Standard, this specification is based on ankle circumference (cB).

5.4.1 Length

Except custom made hosiery, the length and length range shall be selected in Table 5.

5.4.2 Circumference

Except custom made hosiery, the circumference and circumference range shall be selected in Table 6.

5.5 Type and specification mark of compression hosiery

Compression hosiery shall comply with the type codes in Table 7 (except custom made hosiery), and shall be marked by the following three pairs of numbers that represent leg sizes of which compression hosiery applies to.

- According to ankle circumference range given in Table 6;

- According to ankle circumference range of compression hosiery's upper end given in Table 6;

- According to length range given in Table 5.

When the values of each measurement point in the middle are in the same vertical column in Table 6, or the minimum circumference and the maximum

10.1 Extensibility

The compression hosiery shall be able to transversely extend to at least 120% at measuring point B and farthest measuring points (D, F and G, if applicable), and longitudinally at least 30% at measuring point B and farthest measuring point (D, F and G, if applicable). Conduct the test according to Appendix C.

10.2 Practical rate of extension

The practical rate of extension at measuring points of B, B1, C, D, E, F and G shall not be less than 15% and not be greater than 140%. Conduct the test according to Appendix B.

10.3 Residual pressure

In order to prevent irregular pressure profile along with leg length, it shall measure the pressure at measuring points B, B1, C, D, E, F and G (if applicable) (shown in B.2.4).

It shall calculate the residual pressure at each measuring point of B1, C, D, E, F and G (if applicable) (shown in B.2.5).

The residual pressure of compression hosiery (pressure profile) shall be within the range determined by given values in Table 8.

Note: […]