Stackable Wafer Column for Vertebral Height Restoration
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Solution Overview
Problem
Current surgical methods for distracting and supporting tissue surfaces, such as bone surfaces, are often invasive and lack effective means for consistent and controlled distraction, particularly in procedures like vertebral compression fracture treatment and spinal fusion, leading to inconsistent results and long-term stability concerns.
Innovation Solution
A minimally invasive distraction device using stackable wafers to form a column that can be implanted between tissue surfaces, allowing for directional distraction and support, with a wafer insertion apparatus for precise placement and incremental advancement, enabling the restoration of vertebral height and stabilization of fractures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional open reduction and internal fixation methods are used to treat compression fractures, then fracture stabilization can be achieved, but surgical invasiveness increases and rehabilitation time extends
Solution Approach 1:
The distraction device is divided into multiple stackable wafers that can be inserted individually through a minimally invasive window. Each wafer acts as an independent unit that accumulates distraction force, allowing the system to achieve stable fracture separation without requiring extensive surgical exposure or complex instrumentation.
Solution Approach 2:
The wafer column serves as an intermediary mechanism between the surgical window and the fracture site. It transmits distraction force from the minimally invasive access point to the compressed fracture, enabling fracture treatment without direct manipulation or extensive exposure of the fracture site itself.
2Strength
If bone filler is injected at high pressure to stabilize fractures, then fracture strength improves, but the risk of bone filler extravasation increases dramatically
Solution Approach 1:
The distraction device is inserted and positioned before bone filler injection to establish the distraction space and stabilize the fracture geometry. This preliminary mechanical stabilization creates a controlled environment that prevents bone filler extravasation during subsequent filling procedures, as the fracture is already separated and supported rather than being compressed during injection.
Solution Approach 2:
The wafer column acts as a mechanical intermediary that prevents direct contact between high-pressure bone filler and the compressed fracture site. By maintaining separation and distraction, it creates a protective barrier that channels bone filler flow safely while preventing extravasation into surrounding tissues.
3Shape
If balloons are inflated to restore vertebral height in kyphoplasty, then some height restoration is achieved, but results are inconsistent due to balloon expansion behavior in compressible media
Solution Approach 1:
Instead of using a single inflatable balloon that expands unpredictably in compressible media, the system uses multiple rigid wafers stacked to form a column. Each wafer provides a consistent, predictable distraction force, and their cumulative effect creates reliable and consistent vertebral height restoration without the variability inherent in balloon expansion.
Solution Approach 2:
The system changes the physical parameters of the distraction mechanism from flexible (balloon) to rigid (wafer column). This parameter change transforms the distraction force from variable and pressure-dependent to constant and geometry-dependent, ensuring consistent height restoration regardless of the compressible media or trabecular bone structure.
4Ease of operation
If a window is cut into the tibia to access compression fractures, then fracture treatment access is gained, but the window must be packed with graft material and secured with bone plates
Solution Approach 1:
The distraction device is designed to be self-contained and self-sustaining. The stackable wafers automatically maintain the distraction space and stabilize the fracture without requiring additional window packing materials or bone plate fixation. The device serves its own stabilization function, eliminating the need for supplementary structural support.
Data Source
AI summary
An apparatus and method for distracting, in a given direction, and supporting two tissue surfaces is disclosed using a column of wafers. The column of wafers is oriented so as to expand in the given direction as the wafers are consecutively added to the column. A wafer insertion apparatus includes a wafer cartridge configured to carry a stack of wafers to be inserted into the space, a track assembly including a first track for carrying a wafer toward the space, a second track and means for preventing retrograde movement of a wafer within the first track, an advancer/pusher mechanism slidably disposed within the second track and operable on a wafer within the first track to advance the wafer along the first track, and an advancement gun operably coupled to the advancer/pusher mechanism to propel the mechanism along the second track.