| 摘要 |
<p>An interspinal retractor device (1) comprises: - a first and a second portion (2, 3) movable along an expansion axis (Y) between a resting position in which the said portions are close together and an expanded position in which the said portions have been moved apart from each other; - expansion means (10) associated with the first and second portions (2, 3) and selectively operable by a user to move them to and from the resting position, and - at least one pair of centring and holding wings (7; 8) which are arranged on opposite sides of the device and which are movable by the said expansion means between a non-operative position, in which the wings are at a distance from a transverse centre plane (B) of the device substantially parallel with the expansion axis (Y), and an operative position in which the wings are close to the transverse centre plane (B) and protrude from the first or second portion. The expansion means are further arranged to move at least partially the pair of wings from the non-operative position before the first and second portions are moved from the resting position.</p> |
