An intervertebral implant that iterates between collapsed and expanded configurations includes first and second plates spaced from one another along a first direction and defining bone-contacting surfaces facing away from each other along the first direction. An expansion assembly is positioned between the plates with respect to the first direction and includes a first support wedge that supports the first plate and defines a first ramp and a second support wedge that supports the second plate and defines second and third ramps. The expansion assembly includes an expansion wedge defining a fourth ramp. The first, second, third, and fourth ramps are each inclined with respect to a second direction that is substantially perpendicular to the first direction. At least one of the first and second support wedges is slidable along the respective supported first or second plate. The implant includes an actuator configured to apply a drive force to the expansion wedge so as to cause 1) the fourth ramp to ride along the third ramp so as to increase a distance between the bone-contacting surfaces along the first direction, and 2) the second ramp to ride along the first ramp, thereby further increasing the distance, thereby iterating the implant from the collapsed to the expanded configuration.Un implant intervertébral qui effectue une itération entre des configurations repliée et déployée comprend des première et seconde plaques espacées l'une de l'autre le long d'une première direction et définissant des surfaces de contact avec l'os opposées l'une à l'autre le long de la première direction. Un ensemble d'expansion est positionné entre les plaques par rapport à la première direction et comprend une première cale de support qui supporte la première plaque et définit une première rampe et une seconde cale de support qui supporte la seconde plaque et définit des deuxième et troisième rampes. L'ensemble d'expansion comprend une cale d'expansion définissant une quatrième rampe. Le
