| retrievable | 0.47 |
| medical device | 0.53 |
| small metal device | 0.41 |
| a wire device | 0.38 |
| removed | 0.66 |
| implanted in patient | 0.65 |
| used in patient | 0.64 |
| implanted in inferior v… | 0.54 |
| designed to prevent blo… | 0.48 |
| implanted in the larges… | 0.38 |
| removed after implantat… | 0.30 |
| prone to fracture | 0.26 |
| left in the body | 0.22 |
| proven successful | 0.16 |