Patent ID: 11918486
Assignee: nan
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 22:
23. A surgical apparatus configured to treat a functional spinal unit, the functional spinal unit comprising a superior vertebral bone, an inferior vertebral bone and an intervertebral disc space positioned in between, the surgical apparatus comprising a non-implantable tissue retraction assembly and an implantable device configured to alter movement between the superior vertebral bone and the inferior vertebral bone, wherein:
the implantable device comprises a first member configured to engage the first vertebral bone, a second member configured to engage the second vertebral bone, and a connecting member configured to couple the first member and the second member; and
the non-implantable tissue retraction assembly comprises:
a housing member comprising an external casing and an internal cavity, the casing comprising a front portion, an opposing back portion, and first and second sides;
an elongated handle configured to couple with the opposing back portion of the casing, at least a portion of the elongated handle extending, along a longitudinal axis, from a distal end to a proximal end of the elongated handle;
a first arm extending from a distal end surface to a proximal end surface, the first arm configured to movably retract through at least a part of the front portion of the casing and, upon actuation, to translate within the internal cavity;
a second arm extending from a proximal first portion to a distal second portion, the proximal first position forming a rotational coupling with the first side of the casing, the second arm configured to rotate about a rotational axis that extends from a top surface to a bottom surface of the casing;
a third arm extending from a proximal first portion to a distal second portion, the proximal first portion comprising a rotatable coupling with the second side of the casing, the third arm configured to rotate about a rotational axis that extends from the top surface to the bottom surface of the casing and is non-colinear with the rotational axis of the second arm; and
an adjustment mechanism comprising a first actuator that is disposed external to the casing, the first actuator configured to, upon actuation, movably translate at least a portion of the first arm within the internal cavity; and
wherein:
the first actuator is positioned a greater distance from the front portion of the casing than at least one of the rotational axis of the second arm or the rotational axis of the third arm, and

the proximal end surface of the first arm is retained within the internal cavity when the adjustment mechanism is any position.