Retractor with modular tap assemblies

A retractor assembly, comprising;

• an elongated base having a first side including a first plurality of teeth and a first elongated through slot extending along a first direction, and a second side including a second plurality of teeth and a second elongated through slot extending along the first direction;
• a first side arm assembly coupled to the first side of the base and configured to translate along the base in the first direction, the first side arm assembly including:
• a first arm portion including a cavity receiving the first side of the base therethrough, and including a first ratchet mechanism configured to engage the first plurality of teeth;
• a second arm portion coupled to the first arm portion of the first arm assembly and extending along a first longitudinal axis perpendicular to the first direction such that the second arm portion is rotatable about the first longitudinal axis relative to the first arm portion, wherein the second arm portion of the first side arm assembly includes a first recess having a closed superior end closed by a top side of the second arm portion of the first side arm assembly and an inferior open end opening through a bottom side of the second arm portion of the first side arm assembly;
• and
• a first locking knob extending through the closed superior end of the second arm portion;
• a first side blade assembly having a first attachment arm configured to be received in the first recess of the first side arm assembly only from the bottom side of the second arm portion of the first side arm assembly of the retractor assembly such that the first locking knob threadingly engages a locking aperture of the first attachment arm of the first side blade assembly, the first side blade assembly further includes a first tap assembly including a first threaded screw configured to threadingly engage bone;
• a second side arm assembly coupled to the second side of the base and configured to translate along the base in the first direction independent from the first side assembly, the second side arm assembly including:
• a first arm portion including a cavity receiving the second side of the base therethrough, and including a second ratchet mechanism configured to engage the second plurality of teeth;
• a second arm portion coupled to the first arm portion of the second side arm assembly and extending along a second longitudinal axis perpendicular to the first direction such that the second arm portion of the second side arm assembly is rotatable about the second longitudinal axis relative to the first arm portion of the second side arm assembly, wherein the second arm portion of the second side arm assembly includes a second recess having a closed superior end closed by a top side of the second arm portion of the second side arm assembly;
• and an inferior open end opening through a bottom side of the second arm portion of the second side arm assembly;
• and
• a second locking knob extending through the closed superior end of the second arm portion of the second side arm assembly;
• a second side blade assembly having a second attachment arm configured to be received in the second recess of the second side arm assembly only from the bottom side of the second arm portion of the second side arm assembly of the retractor assembly such that the second locking knob threadingly engages a locking aperture of the second attachment arm of the second side blade assembly, the second side blade assembly further includes a second tap assembly including a second threaded screw configured to threadingly engage bone;
• a center arm assembly having a first portion removably coupled to a center portion of the base between the first and second sides of the base, and a second portion of the center arm assembly is configured to translate relative to the base and through the first portion of the center arm assembly along a second direction different from the first direction, the second portion of the center arm assembly includes a center recess opening through a top side of the second portion of the center arm assembly;
• a center blade assembly having a center attachment arm configured to be removably coupled into the center recess of the second portion of the center arm assembly only from the top side of the second portion of the center arm assembly of the retractor assembly, wherein the center blade assembly includes a second blade received by a first blade coupled to the center arm assembly;
• and
• a locking screw configured to threadingly engage the top side of the second portion of the center arm assembly and having a head including a cutout configured for rotation to be aligned with the center recess to allow coupling the center attachment arm in the center recess of the center arm assembly and configured for rotation to be unaligned with the recess to retain the center attachment arm in the center recess of the center arm assembly.