| to reach the heart valve | 15 | purpose |
| through cavities | 5 | manner |
| to enable | 4 | purpose |
| catheter → be → steerable | 23 |
| catheter → have → sufficient steerability | 4 |
| negative | neutral | positive |
| 0.037 | 0.846 | 0.118 |
| Raw frequency | 27 |
| Normalized frequency | 0.365 |
| Modifier score | 0.500 |
| Perplexity | 116.990 |