Spinal Correction Device Segmentation for Length Adjustment
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Solution Overview
Problem
Conventional spinal correction devices are difficult to miniaturize and adjust to individual patient needs, and their single-type assembly structure complicates cleaning, potentially leading to infection risks during surgery.
Innovation Solution
A spinal correction device featuring a pedicle screw with opposing slits, an extender with guiding slits, a reduction body, and a rod reducer, allowing for length adjustment and easy assembly/disassembly, with screw threads and elastic fastening mechanisms for secure fixation and hygiene improvement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-type assembly aid structure (conventional pershader) is used, then the structure is simple, but miniaturization is difficult and length adjustment is not possible
Solution Approach 1:
The assembly aid structure is divided into multiple detachable segments: the pershader body, the rod reducer, and the extender. This segmentation allows each component to be independently sized and configured, enabling length adjustment while keeping individual components simple and manageable.
Solution Approach 2:
The pershader transitions from a fixed single-type structure to a dynamic multi-type system where the extender can be attached or detached based on the required length, allowing the device to adapt to different surgical needs without requiring multiple complete assemblies.
2Reliability
If a single-type assembly aid structure with slits is used, then the structure is simple, but cleaning is difficult and infection risk increases
Solution Approach 1:
By separating the pershader into detachable components (pershader body and rod reducer), each part can be independently cleaned and sterilized. The slits and complex geometries that trap contaminants in a single-piece design become accessible cleaning surfaces when the components are separated.
Solution Approach 2:
The rod reducer is extracted as a separate removable component from the pershader body. This extraction allows the rod reducer to be removed for separate cleaning and sterilization, eliminating the infection risk associated with trapped contaminants in hard-to-reach areas of an integrated structure.
3Adaptability or versatility
If multiple pershaders with individual lengths are used, then length adjustment is possible, but the number of components increases and management becomes complex
Solution Approach 1:
A single pershader body can be combined with extenders of different lengths to create multiple effective length configurations. This multi-functional approach allows one pershader to replace what would traditionally require multiple separate pershaders of different fixed lengths, reducing inventory complexity while maintaining length variation capability.
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
Enables miniaturization, adjustable length, and improved hygiene by allowing for easy cleaning, reducing the risk of infection and enhancing surgical stability.
Implementation Method 1
a first elastic body having one end and the other end respectively connected to the other end of the first fastening piece and the outer surface of the extender so as to provide a fastening force to the first hook
Implementation Method 2
a third screw thread may be formed that meshes with the first screw thread or the second screw thread on an outer circumferential surface of the rod reducer
Data Source
AI summary
The present invention provides a spinal correction device comprising: a pedicle screw comprising a seating part having a pair of first slits formed opposite to each other, and a screw part disposed at one side of the seating part so as to be implanted into a bone; an extender having a pair of second slits for guiding a rod so as to seat same in the seating part, and detachably fastened at one side thereof to the outer surface of the seating part; a reduction body detachably fastened to the other side of the extender; and a rod reducer arranged to pass through the reduction body and the extender so as to fix the rod placed in the pair of second slits by pressing the rod against the seating part.