Table 4.
Measured dimensions of PLGA microneedles (mean ± standard deviation, n = 7).
| Microneedle geometry | Apex angle (degree, αapex) | Bevel angle (degree, αbevel) | Diameter (μm) | Height (μm) | Volume shrinkage (%) | ||||
|---|---|---|---|---|---|---|---|---|---|
| Dtip | Dstem | Dbase | Htip | Hstem | Hbase | ||||
| Circular obelisk | 54.92 ± 1.91 | 88.52 ± 0.42 | 200.46 ± 1.60 | 200.46 ± 1.60 | 400.80 ± 11.87 | 193.06 ± 8.09 | 200.36 ± 6.38 | 58.47 ± 8.72 | 13.86 ± 4.28 |
| Beveled-circular obelisk | 44.34 ± 1.09 | 82.92 ± 0.76 | 168.67 ± 2.49 | 233.22 ± 7.35 | 427.50 ± 2.69 | 195.04 ± 4.32 | 259.97 ± 1.93 | 64.27 ± 4.48 | 19.16 ± 5.72 |