Used for stepwise nested dilation of soft tissues can be used for independent dilation of soft tissues or fine-tuning guide wire position after dilation to establish the surgical pathway for lumbar spine posterior approach.
| Working Length(mm） | Working Diameter(mm) |
| 230 | 2.5 |
| 220 | 4.0 |
| 210 | 5.0 |
| 200 | 6.0 |
| 190 | 7.0 |
| 180 | 8.0 |
| 220 | 6.3 |
Used for stepwise nested dilation of soft tissues can be used for independent dilation of soft tissues or fine-tuning guide wire position after dilation to establish the surgical pathway for lumbar spine posterior approach.
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