Before the design of medical puncture needles, we first need to have a certain understanding of the positioning of the quality of materials. So what are the noteworthy parameter standards we need to have for puncture needle materials?

Straightness of the puncture needle structure: the straight line is an important reason why the work twitching is smooth after the outer needle body and the inner needle body cooperate. No matter whether we are a tube body or a needle body, the materials on the market basically do not perform straightness twice Straightness is effective, and the friction of our needle body during surgery will increase. Generally, straightness scales use the distance of 100MM bits to perform beating data requirements. For example, 100MM is allowed to jump like 0.01MM.

Roughness of the puncture needle structure: general puncture material, the allowable roughness is about Ra0.4, the roughness has a great relationship with the feel of the operation, in the domestic pull tube manufacturers, many of the materials come out because of technical or requirements problems Roughness, the surface roughness of the inner core also needs to be within Ra0.4.

The hardness of the puncture needle: hardness is the most basic guarantee to ensure the continuous use of the puncture force, so we can set the parameter with the best hardness under the condition of ensuring the straightness of the material. Generally, our hardness is between HV360-420 There is no problem.

The toughness of the puncture needle: When it comes to toughness, this basically has a very strong need for long-length needles, because the needles are very thin. During the surgical puncture, the second puncture is performed because of the partial bias. The overall returnability of the puncture needle material determines the accuracy of the surgical puncture. The so-called toughness is what we call elasticity, which is generally taken at two points. Return test, this is written in GB/T 18457-2015 standard.

Corrosion resistance of the puncture needle: If there is no problem with the composition of the material, since it meets the standard, then corrosion resistance still appears, but this is where the surface cleaning process has appeared for us. What we need to remove is the removal of surface iron ions after degreasing, the oxide layer and There may be residual incentives on the processed surface. The test of salt concentration is carried out according to GB/T 18457-2015 standard.