Expandable si joint fixation device with deployable anchors

An expandable joint fixation device, comprising:

• a housing having a longitudinal axis;
• a distal pivot body configured to receive the housing, wherein the distal pivot body translates linearly along the housing with respect the longitudinal axis of the housing;
• a pair of endplates pivotally coupled to housing and the distal pivot body, wherein each endplate of the pair of endplates is configured to pivot from a closed position to an expanded position outwardly away from the housing upon translation of the housing toward the distal pivot body;
• and
• an actuation mechanism comprising,
• a linkage assembly comprising,
• a first deployable anchor and a second deployable anchor each coupled to the distal pivot body, wherein the first deployable anchor and the second deployable anchor are each movable between a retracted position within the expandable joint fixation device and a deployed position where a portion of the first deployable anchor and a portion of the second deployable anchor extend beyond the endplate and into bone adjacent to the expandable joint fixation device,
• a first anchor arm connected between the first deployable anchor and a first side of the housing, wherein the first deployable anchor and the first anchor arm form a first pivoting arm assembly, and
• a second anchor arm connected between the second deployable anchor and a second side of the housing, wherein the second deployable anchor and the second anchor arm form a second pivoting arm assembly, and
• a screw drive rotatably retained within the housing and between the first pivoting arm assembly and the second pivoting arm assembly, wherein the screw drive is configured to simultaneously pivot the pair of endplates to the expanded position and move the first anchor and the second anchor to the deployed position.

A method of fusion for a sacroiliac (SI) joint, comprising:

• inserting an expandable fixation device across the SI joint in an unexpanded configuration, the fixation device including a housing, a distal pivot body translationally coupled to the housing, at least one endplate pivotally coupled to the distal pivot body, and at least one deployable anchor in a retracted position;
• actuating an actuation mechanism to cause the housing to translate toward the distal pivot body;
• and
• simultaneously expanding the at least one endplate outwardly to distract the SI joint and deploying the at least one deployable anchor outwardly through the at least one endplate and into bone adjacent to the SI joint.