Intervertebral devices

An intervertebral fusion device comprising:

• a superior component having a superior component top side and a superior component bottom side, the superior component being configured to be received in an intervertebral space between first and second vertebrae whereby the superior component top side abuts against the first vertebra;
• an inferior component having an inferior component top side and an inferior component bottom side, the inferior component being configured to be received in the intervertebral space between the first and second vertebrae whereby the inferior component bottom side abuts against the second vertebra, the superior component bottom side and the inferior component top side opposing each other when the superior and inferior components are received in the intervertebral space;
• and
• a core component configured for insertion between the superior and inferior components whereby a separation between the superior and inferior components is determined when the intervertebral fusion device is in the intervertebral space, wherein
• the core component comprises a first core formation and one of the inferior component top side and the superior component bottom side comprises a first component formation, the first core formation inter-engaging with the first component formation to present a barrier to separation of the core component and the corresponding one of the inferior and superior components from each other during insertion of the core component,
• the core component comprises a core profile and the other of the inferior component top side and the superior component bottom side comprises a component profile, the core profile and the component profile cooperating with each other during insertion of the core component to thereby guide the core component, there being no barrier to separation of the core component and the corresponding one of the inferior and superior components from each other during insertion of the core component, and
• the core component comprises a second core formation and the other of inferior component top side and the superior component bottom side comprises a second component formation, the second core formation inter-engaging with the second component formation to present a barrier to separation of the core component and the corresponding one of the inferior and superior components from each other when the core component is substantially fully received between the inferior and superior components.