Independent Rotation Bone Screw for Locking and Lagging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current plating systems in orthopedic surgery face challenges with inadequate fixation and bone healing due to the limitations of screws that can only perform single functions, requiring a combination of locking and lagging screws for proper alignment and stability, which adds complexity for surgeons.
Innovation Solution
A bone screw design that features a head and shaft capable of independent rotation, allowing the screw to lock to a plate and lag the bone, providing both locking and lagging functions in a single screw, enabling anatomical reduction and stable fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locking bone screws are used to provide rigid fixation and stable constructs, then stability and fixation reliability are improved, but anatomical reduction capability deteriorates
Solution Approach 1:
The bone screw is divided into functionally independent segments: a head portion for locking to the plate and a shaft portion for lagging the bone. The head and shaft can rotate independently of each other, allowing each segment to perform its specific function without interfering with the other segment's operation.
Solution Approach 2:
A single bone screw combines both locking and lagging functions that were previously requiring two separate screw types. The screw head provides locking capability while the shaft provides lagging capability, enabling one screw to perform multiple functions simultaneously.
2Ease of operation
If lagging bone screws are used to achieve anatomical reduction, then anatomical alignment is improved, but fixation stability deteriorates
Solution Approach 1:
The bone screw is divided into functionally independent segments: a head portion for locking to the plate and a shaft portion for lagging the bone. The head and shaft can rotate independently of each other, allowing each segment to perform its specific function without interfering with the other segment's operation.
Solution Approach 2:
A single bone screw combines both locking and lagging functions that were previously requiring two separate screw types. The screw head provides locking capability while the shaft provides lagging capability, enabling one screw to perform multiple functions simultaneously.
3Ease of operation
If a combination of locking and lagging screws is used to provide both stability and anatomical reduction, then both fixation stability and anatomical alignment are improved, but device complexity and surgical procedure complexity increase
Solution Approach 1:
Two separate screw types (locking screw and lagging screw) are merged into a single integrated bone screw. The head and shaft are connected but can rotate independently, combining the functions of two different screws into one unified component that reduces device complexity.
Solution Approach 2:
A single bone screw combines both locking and lagging functions that were previously requiring two separate screw types. The screw head provides locking capability while the shaft provides lagging capability, enabling one screw to perform multiple functions simultaneously.
Data Source
AI summary
A locking and lagging bone screw. The screw includes a head having an outer surface which is at least partially threaded and a shaft which is at least partially threaded having a first end coupled to the head and a second end adapted to be fastened to bone. The head of the screw is able to rotate independently of the shaft. Thus, the head of the screw can be locked to a bone plate by using a first driver (e.g., a torx driver) and the plate can be lagged to the bone by using a second driver (e.g., a hex driver).