Transverse coupling for surgical implant extensions

A transverse coupling for connecting a first implant extension to a second implant extension, the transverse coupling comprising:

• a first sleeve defining a first aperture adapted to axially receive the first implant extension through the first aperture;
• a second sleeve defining a second aperture adapted to axially receive the second implant extension through the second aperture;
• a central housing comprising a first joint and a second joint;
• a first shaft connecting the first sleeve to the first joint of the central housing, the first shaft having a first diameter;
• and
• a second shaft connecting the second sleeve to the second joint of the central housing, the second shaft having a second diameter,
• the central housing comprising an upper housing portion and a lower housing portion interconnected to the upper housing portion,
• the upper and lower housing portions forming a first passage through which the first shaft extends and a second passage through which the second shaft extends,
• the upper and lower housing portions being separated by a first gap that extends alongside the first passage along a first perimeter portion of the central housing,
• the upper and lower housing portions being separated by a second gap that extends alongside the second passage along a second perimeter portion of the central housing,
• the first gap being wider than the first diameter of the first shaft so that the first passage is open alongside the first shaft along the first perimeter portion to allow the first shaft to be displaceable relative to the central housing in three degrees of freedom, and
• the second gap being narrower than the second diameter of the second shaft so that the second gap forms a constriction alongside the second shaft and along the second perimeter portion to limit displacement of the second shaft relative to the central housing to two degrees of freedom and prevent displacement of the second shaft in a third degree of freedom.