S-LIFT Extension Shims Extension shims are manufactured from grade 5 titanium and are curved, rectangular slabs which have four protrusions used for ratcheting. They come in straight and pointed varieties, either with or without a tab containing an additional bend. Extension shims are designed to slide down retractor blades, and are optional retractor components utilized during lumbar interbody fusion procedures. They are intended to manipulate tissue and prevent tissue from interfering inside the surgical field.
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