Cervical Spine Endplate Shaver for Precise Bone Preparation
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Solution Overview
Problem
Existing end-plate preparation techniques in cervical spine surgery are imprecise and inefficient, leading to potential subsidence of cages and fusion delays or failures due to micro-movement and improper positioning of ceramic cages.
Innovation Solution
A cervical spine endplate preparation apparatus with a handle, rotating shaft, and shaver part that allows for precise bone-cutting by rotating blades, enabling accurate end-plate preparation and installation of ceramic cages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If drilling and curette are used for end-plate preparation, then the procedure can be performed with simple tools, but excessive decortication occurs causing subsidence of the cage into the vertebral body
Solution Approach 1:
The end-plate preparation apparatus divides the cutting function into multiple blades arranged in a specific pattern, allowing controlled removal of bone tissue. The segmented blade structure enables precise decortication without excessive removal, solving the problem of cage subsidence while maintaining operational simplicity.
Solution Approach 2:
The apparatus uses a rotating shaver mechanism that dynamically adjusts the cutting action. The rotation speed and blade exposure can be controlled to achieve precise end-plate preparation, preventing both excessive decortication and insufficient preparation, thereby avoiding cage subsidence and fusion delays.
2Ease of manufacture
If drilling and curette are used for end-plate preparation, then the procedure can be performed with simple tools, but fusion delay or failure occurs due to insufficient preparation
Solution Approach 1:
The multi-blade shaver configuration ensures comprehensive coverage of the end-plate surface, creating optimal bone contact area for fusion. The segmented blades work together to achieve uniform preparation, preventing fusion delays or failures while keeping the device relatively simple.
Solution Approach 2:
The apparatus allows adjustment of blade exposure depth and rotation speed to optimize the preparation quality. By controlling these parameters, the system ensures sufficient decortication for reliable fusion without over-preparation, thereby improving fusion success rate while maintaining tool simplicity.
3Manufacturing precision
If a shaver with adjustable blade exposure is used, then precise end-plate preparation can be achieved, but the device structure becomes more complex
Solution Approach 1:
The shaver blades are nested within a protective housing that can be adjusted to expose different lengths of blades. This nested structure allows precise control of blade exposure without adding significant external complexity, enabling accurate end-plate preparation while keeping the overall device compact and manageable.
Solution Approach 2:
The adjustable shaver mechanism serves multiple functions: it can adjust blade exposure for different preparation depths, control rotation speed, and provide stable positioning. This multi-functionality consolidates several control features into a single integrated system, reducing overall device complexity while maintaining high precision.
4Loss of time
If ceramic cages are positioned without precise end-plate preparation, then the surgery can be completed quickly, but micro-movement occurs causing subsidence and fusion failure
Solution Approach 1:
The apparatus performs preliminary end-plate preparation by creating an optimal receptacle shape before cage insertion. This preliminary action ensures the cage fits precisely without micro-movement, preventing subsidence and fusion failure while maintaining surgical efficiency through streamlined preparation.
Solution Approach 2:
The rotating shaver mechanism replaces traditional manual drilling and curettage methods, providing more consistent and controlled bone removal. This mechanical substitution achieves better preparation quality faster, ensuring stable cage positioning without extending surgery time, thereby improving reliability without sacrificing efficiency.
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 precise end-plate preparation, minimizing micro-movement and ensuring optimal positioning of ceramic cages for stable bone fusion, reducing the risk of subsidence and fusion failures.
Implementation Method 1
a rotating shaft part having an adjustment grip, which generates a driving force by means of rotation by hand, and a rotating shaft passing through the inside of the handle and leading rod
Implementation Method 2
as the rotatable shaver rotates in an axial direction of the entire structure, the blade of the shaver contacts the upper endplate of the internal space of the spine to accurately perform bone-work
Data Source
AI summary
A cervical spine endplate preparation apparatus is provided. To this end, the present invention comprises: a handle part having a handle to be held by hand and a leading rod extending from the handle in the length direction and for guiding to a space inside the spine of a part to be operated on; a rotating shaft part having an adjustment grip, which generates a driving force by means of rotation by hand, and a rotating shaft passing through the inside of the handle and leading rod; and a shaver part which has a case, provided on the leading rod and inserted into the space of the spine, and a shaver installed inside the case and mating with the rotating shaft to rotate by means of the driving force of the adjustment grip, and having a part of a blade exposed to the top of the case and rotating.