Bidirectional Ratchet Distractor for Spinal Compression Control
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Solution Overview
Problem
Conventional surgical distractors lack the ability to efficiently and precisely control both distraction and compression of vertebral bodies during spinal procedures, limiting their effectiveness in maintaining desired separation and force application.
Innovation Solution
A bidirectional distractor system with ratcheted distractor arms and screws, allowing for controlled distraction and compression through a crossbar mechanism, utilizing surgical stainless steel components and a lock mechanism for secure positioning, enabling precise movement and force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional surgical distractors are used, then the basic distraction function is provided, but the precision and control over both distraction and compression are insufficient
Solution Approach 1:
The distractor arms are designed to be movable rather than fixed, allowing dynamic adjustment between distraction and compression modes. The arms can rotate about pins and be positioned at different angles relative to the longitudinal axis, enabling precise control over force application direction and magnitude while maintaining a relatively simple overall device structure
Solution Approach 2:
The device allows changing the operational parameters by adjusting the angle and position of the distractor arms. By modifying the arm configuration (e.g., setting arms parallel to each other vs. at angles), the system can transition between pure distraction, pure compression, and combined modes, providing precise control without requiring multiple separate devices
2Adaptability or versatility
If bidirectional control is added to allow both distraction and compression, then the versatility is improved, but the device complexity increases
Solution Approach 1:
The distractor arms serve multiple functions: they can apply distraction forces, compression forces, or a combination of both depending on their configuration. The same mechanical components (arms, pins, crossbar) enable bidirectional control without requiring separate mechanisms for distraction and compression, thereby increasing versatility while limiting complexity growth
Solution Approach 2:
The device is divided into modular components including separate distractor arms that can be independently positioned and adjusted. Each arm can be controlled separately, allowing flexible configuration for different surgical needs while keeping each individual component relatively simple in design
3Manufacturing precision
If ratcheted arms with lock mechanism are used, then the positioning precision is improved, but the device complexity and number of components increase
Solution Approach 1:
The ratchet mechanism provides self-locking capability that automatically maintains the desired arm position once set. The lock mechanism engages passively to prevent accidental movement while allowing intentional adjustment, providing precise positioning control without requiring continuous active control or additional complex stabilization systems
Solution Approach 2:
The ratchet and lock mechanism act as intermediary elements between the adjustable distractor arms and the fixed vertebral attachment points. These components mediate the force transmission and position control, enabling precise positioning while isolating the complexity of the control mechanism from the primary distraction/compression function
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
The system provides precise control over distraction and compression, facilitating effective vertebral separation and implant placement, enhancing the precision and safety of spinal surgical procedures.
Implementation Method 1
A bidirectional distractor system with ratcheted distractor arms and screws, allowing for controlled distraction and compression through a crossbar mechanism
Implementation Method 2
A bidirectional distractor system with ratcheted distractor arms and screws, allowing for controlled distraction and compression through a crossbar mechanism
Data Source
AI summary
A distractor system may include a distractor, a first distraction screw, and a second distraction screw. The first distraction screw includes a proximal end and a distal end having threads that affix the screw to bone. First and second arms are coupled to a crossbar via respective first and second ratchets and are configured to receive respective first and second distraction screws. The first ratchet includes a switch configured to select between ratcheted movement of the first arm along the crossbar toward the second arm and ratcheted movement of the first arm along the crossbar away from the second arm.