Intravertebral Distraction Reducer for Central Bony Block Reduction
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Solution Overview
Problem
Existing lumbar spine fracture treatments using pedicle screw rod systems fail to effectively reduce the central bony block of the anterior middle column, leading to central collapse, insufficient reduction, and long-term complications such as anterior support loss, vertebral body height loss, and degeneration of adjacent intervertebral discs.
Innovation Solution
An intravertebral distraction reducer with a forceps body comprising hinged forceps arms, an outer sleeve, inner rod, and a distraction ball, which allows for the distraction of the collapsed bony block from within the fractured vertebral body by sliding mechanisms and deformation of distraction pieces, facilitating complete vertebral body reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixation and reduction mechanism of a pedicle screw rod system is used to reduce a fractured vertebral body through indirect pulling, then the periphery of the fractured vertebral body can be effectively reduced, but the central bony block of the anterior middle column cannot be pulled and reduced, causing central collapse loss and insufficient reduction
Solution Approach 1:
The reduction mechanism is divided into two independent parts: indirect pulling for peripheral reduction and direct pushing for central block reduction. The forceps body with inner rod and distraction ball provides a separate direct action system that can reach the central bony block without relying on peripheral structures, enabling complete reduction of both peripheral and central components.
Solution Approach 2:
The distraction ball acts as an intermediary tool that is inserted into the vertebral body cavity to directly push the central bony block. This intermediary mechanism allows direct manipulation of the central block that cannot be accessed by external pulling forces, solving the problem of incomplete central reduction.
2Productivity
If indirect pulling is used to reduce the fractured vertebral body, then the periphery can be reduced, but a cavity is formed in the reduced vertebral body, causing insufficiency of anterior support and long-term height loss
Solution Approach 1:
The reduction process is segmented into peripheral reduction (via indirect pulling) and central block reduction (via direct pushing with distraction ball). This segmentation ensures that both the peripheral structure and central support structure are addressed independently, preventing cavity formation and maintaining anterior support while achieving complete reduction.
3Manufacturing precision
If the distraction ball is inserted into the fractured vertebral body, then the collapsed bony block can be distracted from the inside, but the device complexity increases
Solution Approach 1:
The distraction ball is nested within the forceps body structure, with the inner rod containing the distraction ball that can be inserted through the forceps arms. This nested design allows the complex distraction function to be integrated into the existing forceps structure without adding separate external components, reducing overall device complexity while maintaining reduction precision.
Data Source
AI summary
Provided is an intravertebral distraction reducer, relating to the field of medical instruments, and including a forceps body including a first forceps arm and a second forceps arm which are hinged. An outer sleeve fixedly connected to a working end of the first forceps arm is provided with an elongated slot into which a working end of the second forceps arm is inserted. An inner rod received in the outer sleeve has one end connected to the working end of the second forceps arm, and the other end extending outside the outer sleeve and provided with a distraction ball. The distraction ball includes a sleeve ring slidably received on the inner rod and located between the outer sleeve and a stop block, distraction pieces fixedly connected between the sleeve ring and the stop block and arranged circumferentially around the inner rod, and the stop block fixedly provided on the inner rod.