Table 1. Physical Properties of Four Types of Self-Expanding Intracranial Stents.
| Neuroform 1 | Neuroform 2 | LEO 1 | LEO 2 | LVIS 1 | LVIS 2 | Enterprise 1 | Enterprise 2 | ||
|---|---|---|---|---|---|---|---|---|---|
| Undeployed diameter | mm | 4.0 | 4.0 | 4.5 | 3.5 | 4 | 4 | 4.5 | 4.5 |
| Undeployed length | mm | 20 | 20 | 40 | 18 | 35 | 49 | 22 | 22 |
| Deployed diameter | mm | 4.32 | 4.1 | 5.1 | 4.2 | 5.0 | 5.2 | 4.5 | 4.6 |
| Deployed length | mm | 22.2 | 22.0 | 28.2 | 13.2 | 22.2 | 27.0 | 22.1 | 21.8 |
| Pore density | pore/mm2 | 0.295 | 0.257 | 0.744 | 1.213 | 0.784 | 0.779 | 0.247 | 0.304 |
| Metal coverage | % | 10 | 10 | 12 | 16 | 12 | 11 | 5 | 5 |
| Loading force | gf* | 25.3 | 12.6 | 65.1 | 58.6 | 86.8 | 76.2 | 13.3 | 16 |
| Passage force | gf | 13.2 | 7.7 | 76.4 | 33.6 | 13.1 | 13.8 | 17.9 | 20.9 |
| Deploying force | gf | 49.2 | 56.7 | 103.3 | 54.5 | 58.8 | 25.6 | 27.7 | 31 |
| Radial force 1† | gf | 13.5 | 9.3 | 55.5 | 12.9 | 25.8 | 48.3 | 16.5 | 13.8 |
| Radial force 2‡ | gf | 151.6 | 107.9 | 264.8 | 91.9 | 48.4 | 72.3 | 110.9 | 130.4 |
| Surface roughness | mm | 2.8 | 3.7 | 8.0 | 13.3 | 12.7 | 14.7 | 19.7 | 20.8 |
| Corrosion resistance | mV | 1040 | - | 570 | - | 1150 | - | >1400 | - |
*gf = gram-force.
†Recovery force of the stent after extrinsic compression is applied parallel to the body of the stent until the diameter of the stent becomes half that of the unconstrained deployed stent.
‡Recovery force of the stent after it was compressed circumferentially until its diameter becomes half that of the unconstrained deployed stent.