An expandable jack cage is an advanced interbody fusion device designed with a mechanical jack (screw-driven) expansion system that enables precise, controlled height adjustment after insertion into the intervertebral space. Inserted in a low-profile, collapsed state, the cage is expanded in situ using a specialized instrument, allowing surgeons to gradually restore disc height, correct alignment, and optimize spinal lordosis.

The jack mechanism provides uniform vertical expansion, ensuring stable contact with vertebral endplates and reducing the risk of implant subsidence or migration. This design also minimizes the need for aggressive endplate preparation and helps preserve surrounding anatomical structures.

The cage includes large graft chambers to accommodate bone graft material (autograft, allograft, or synthetic substitutes), promoting osseointegration and solid fusion. Its surface typically features texturing or serrations to enhance grip and initial stability.

Manufactured from medical-grade titanium or titanium alloys (and sometimes hybrid designs with PEEK), expandable jack cages offer high strength, durability, and excellent biocompatibility. They are especially suitable for minimally invasive spine surgeries (MIS), degenerative disc disease, spinal instability, trauma, and deformity correction, where precision and controlled expansion are critical.

🔹 Key Features

• Jack-based expansion mechanism for precise height control
• Inserted in collapsed form for minimally invasive access
• Uniform vertical expansion for stable endplate contact
• Large graft chamber for fusion
• Anti-migration surface design
• High strength and biocompatibility

🔹 Common Applications

• Minimally invasive spine surgery (MIS)
• Degenerative disc disease
• Spinal instability
• Trauma and deformity correction
• Lumbar and thoracic interbody fusion