Cervical Spinal Canal Expander with Horizontal Vertebral Plate Fastening
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Solution Overview
Problem
Current posterior cervical spinal canal shaping surgeries require a single-door approach, which leads to uneven stress distribution on the vertebral body, small holding force of vertebral plate nails, and inconvenient lifting operations.
Innovation Solution
An expanding and shaping device for the cervical spinal canal, comprising a first fixing part, a second fixing part, and fasteners, which allows for a vertical incision between the vertebral plate and lateral mass, improving holding force and reducing incision size requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If vertebral plate nails are nailed into the vertebral plate in vertical direction, then the holding force is improved, but the incision size requirement increases
Solution Approach 1:
The patent changes the nailing direction from vertical to horizontal, passing through the vertebral plate from one side to the other side. This dimensional change allows the fastener to achieve sufficient holding force without requiring a larger incision, as the horizontal path through the vertebral plate body provides adequate anchorage length while accessing a smaller surgical opening.
2Device complexity
If single-door surgery is performed to incise one side of the vertebral plate, then the surgical approach is simplified, but the stress stability of the vertebral body deteriorates
Solution Approach 1:
The patent employs asymmetric fixation by nailing through the vertebral plate from one side only (single-door approach), but compensates for the potential stress instability by using horizontal nailing that passes completely through the vertebral plate body. This asymmetric yet penetrating approach simplifies the surgical procedure while maintaining stress stability through the horizontal fastener path that engages both cortical and cancellous bone.
3Shape
If vertebral plate is lifted in oblique direction, then the spinal canal expansion is achieved, but the lifting operation becomes inconvenient
Solution Approach 1:
The patent applies preliminary anti-action by using horizontal fasteners that are nailed through the vertebral plate before lifting. These pre-installed horizontal fasteners provide a stable anchorage that allows subsequent oblique lifting of the vertebral plate to expand the spinal canal effectively, while the fasteners themselves remain horizontally oriented and do not interfere with the lifting motion.
Data Source
AI summary
An expanding and shaping device for cervical spinal canal and a mounting device are provided, including the first fixing part, the second fixing part, and the fasteners. The passing-through direction of the fasteners is consistent with the direction of the incision. The fasteners are nailed along a coronal surface. The fasteners pass through the second fixing hole to connect the lateral mass.