Compression Screw Driver Sleeve for Continuous Countersinking
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Solution Overview
Problem
Existing headless compression screw insertion tools face challenges in maintaining generated compression during the transition from screw insertion to countersinking, particularly in areas with minimal soft tissue coverage or near articular surfaces, due to the need for instrument change during critical phases.
Innovation Solution
A driver mechanism with a drive member and compression sleeve that allows for simultaneous or independent rotation, enabling the screw to be inserted and countersunk without changing instrumentation, using a drive selection member to switch between engagement and disengagement positions for seamless compression and countersinking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If instrument change is performed during transition from screw insertion to countersinking, then screw insertion and countersinking can be completed separately, but loss of generated compression occurs and surgical efficiency decreases
Solution Approach 1:
The patent combines the insertion handle and cannulated driver into a single integrated driver system. The drive member includes both an insertion portion for screw insertion and a countersink portion for countersinking, eliminating the need to change instruments during the procedure. This merging of functions maintains continuous compression while improving surgical efficiency.
Solution Approach 2:
The driver system is designed with multi-functionality, where the single driver can perform both screw insertion and countersinking operations. The drive member can engage with the screw head during insertion and then transition to engage with the bone surface for countersinking, allowing one instrument to fulfill multiple surgical functions without compromising compression.
2Ease of operation
If separate instruments are used for insertion and countersinking, then each function can be optimized independently, but device complexity and ease of operation are reduced
Solution Approach 1:
By merging the insertion handle and cannulated driver into one integrated device, the system reduces the number of separate instruments the surgeon must handle. This simplifies the overall device complexity while improving ease of operation, as the surgeon works with a single unified tool throughout the procedure.
Solution Approach 2:
The driver system incorporates dynamic elements that allow it to adapt its function during the procedure. The drive member can dynamically transition between engaging the screw head for insertion and engaging the bone surface for countersinking, providing versatility without requiring multiple static instruments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates improved ease of use and maintains interfragmentary compression by allowing continuous advancement of the screw while maintaining contact with the bone surface, enhancing surgical efficiency and effectiveness.
Implementation Method 1
threads within the through passage threadably engaging threads on the shaft
Data Source
AI summary
A compression screw driver system including a drive member having a shaft extending from a proximal end to a distal end. A drive selection member is positioned about the shaft and is axially moveable along the shaft between an engagement position and a disengaged position. A distal portion of the drive selection member defines a first engagement structure. A compression sleeve is positioned over the distal end of the shaft. The proximal end of the compression sleeve defines a second engagement structure which complements the first engagement structure and the distal end of the compression sleeve defines a contact surface. In the engagement position the first and second engagement structures are engaged and the compression sleeve rotates with the drive member and in the disengaged position the first and second engagement structures are disengaged and the compression sleeve remains stationary while the drive member rotates.