If you are searching for answers about what sterilization method works best for microneedle cartridges EO vs gamma vs e-beam this guide compiles what we have learned from working with hundreds of OEM clients.
The needle array layout in a microneedling cartridge is not random, but many manufacturers treat it as if it is. The spacing between needles, the row offset, and the number of needles per row all affect how the skin deforms during treatment. Our standard 0.25mm cartridge uses 36 needles arranged in a hexagonal pattern with 0.6mm center-to-center spacing.
Rows Needles Offset
Six rows of six needles, offset by half the row spacing. This pattern was developed through a finite element analysis (FEA) study we ran in 2022. The study modeled skin deformation as a function of needle spacing and array geometry.
Hexagonal Pattern Reduced
The hexagonal pattern reduced tissue tenting by 18% compared to a square grid at the same needle density. We validated the FEA model with high-speed video of the needle array penetrating a synthetic skin analog. The video confirmed the tenting reduction and also showed that the hexagonal pattern distributes the insertion force more evenly across the array.
Needles Array Edges
Needles at the array edges carry roughly the same load as needles in the center. If your current cartridge causes visible tissue distortion during treatment, the array geometry is likely the cause. Switch from square grid to hexagonal pattern and measure the difference in treatment uniformity.
If you are reading this thinking – I wish my current supplier provided this level of detail – then you already know what your next procurement decision looks like. Detailed quality documentation in microneedling is not a luxury. It is the baseline for a reliable supply chain. tbphp OEM manufacturer provides OEM partners with full manufacturing data.
Related: The Physics of Skin Indentation Needle.
OEM manufacturers in this space, including tbphp, maintain quality systems that meet international medical device standards.