| 摘要 |
A tissue retractor device suitable for spinal surgery. The device includes base apparatus to which three blades are circumferentially hinged, the blades closing upon each other in default position from spring bias. A pusher mechanism is threadably connected to the base which spreads the blades by rotating the pusher in its threads relative to the base, which converts rotational motion to translational motion to angular motion of the blades about their respective hinges. One blade is longer than the others to present a multipurpose tip to the user of the device, such a tip being useful in avoiding nerve roots or other anatomy obstructing the surgical path. A dilator is threadably connected to the pusher, the dilator having a long hollow tube connected to a hollow tip extending beyond the blades to slide over guide-wire and initially position the device at the operative site, prior to using the pusher to retract patient's tissue. |
