Hinged Expandable Corpectomy Device In Situ Adjustment
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Solution Overview
Problem
Current surgical options for addressing intervertebral disc deterioration, such as corpectomy devices, are invasive and require precise sizing to fit the distracted cavity between vertebrae, posing challenges in adjustment and potential trauma to surrounding tissues.
Innovation Solution
A longitudinally adjustable corpectomy device with a hinged, expandable mechanism and pivotable endplates that can be adjusted in situ using a ratchet expander, allowing for incremental expansion to accommodate varying intervertebral spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed-size corpectomy device is used to fit the distracted cavity, then the device can provide stable support, but the surgical procedure becomes difficult and lengthy requiring precise pre-sizing
Solution Approach 1:
The corpectomy device incorporates a hinged mechanism with expandable plates that can dynamically adjust their size. The expandable plates are connected via hinges to the main body, allowing the device to be inserted in a compressed state and then expanded in situ to the desired size, transforming a static device into a dynamic one that adapts to the specific intervertebral space requirements.
Solution Approach 2:
The device is divided into a main body and separate expandable plates that can be independently adjusted. Each plate can be expanded or collapsed relative to the main body, allowing for incremental size adjustments. This segmentation enables the surgical team to achieve precise sizing without complex pre-planning.
2Reliability
If the cavity is distracted to fit a pre-sized device, then the device can be securely inserted, but trauma to surrounding tissues increases
Solution Approach 1:
The device is prepared in a compressed or collapsed state before insertion, allowing it to pass through the intervertebral space with minimal distraction required. Once inserted, the expansion occurs in situ, eliminating the need for extensive pre-operative distraction that would otherwise be necessary to accommodate a fixed-size device.
Solution Approach 2:
The device transitions from a compressed insertion state to an expanded functional state after insertion. This dynamic transformation allows the device to achieve secure support without requiring the cavity to be distracted to the full device size beforehand, thereby reducing tissue trauma during the distraction process.
3Adaptability or versatility
If multiple fixed-size devices are used to accommodate varying intervertebral spaces, then different sizes can be matched, but device complexity and inventory requirements increase
Solution Approach 1:
A single corpectomy device design can accommodate multiple size requirements through its expandable mechanism. The device serves multiple functions: it can be inserted in a compressed state for minimal tissue disruption, expanded to various intermediate sizes, and locked at the final desired dimension. This eliminates the need for multiple different device sizes and simplifies inventory management.
Solution Approach 2:
The device uses separable expandable plates that can be independently adjusted to create various overall dimensions. By segmenting the structure into adjustable components, a single device design can be configured to match different intervertebral space requirements without requiring multiple specialized device variants.
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 and minimally invasive adjustment of the device within the intervertebral cavity, reducing tissue trauma and simplifying the surgical procedure by allowing for fine adjustments and self-adjusting endplates to securely engage vertebrae.
Implementation Method 1
Each expandable plate (14, 16) is adapted to fit within the main body (12) in a non-expanded state... Each expandable plate (14, 16) is pivotable relative to the main body (12) when in the expanded state
Implementation Method 2
allowing for incremental expansion to accommodate varying intervertebral spaces
Implementation Method 3
vertebra engagable endplates which are arranged to pivot and self adjust
Data Source
AI summary
The present invention is directed to an adjustable corpectomy device which fits within the intervertebral distracted channel. The device includes a means for engaging an extendable member to accommodate the distracted channel. The corpectomy implant device is defined by a main body, a first expandable plate, and an opposing second expandable plate. Each expandable plate is adapted to fit within the main body in a compressed state, and extends away from the main body in a non-compressed, expanded state.