Spinal Rod Kit Segmentation for Torsional Alignment
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Solution Overview
Problem
Existing spinal support rods with non-circular cross-sections face challenges in torsional alignment and fixation due to variations in cross-sections, particularly in the thoracic region, making it difficult to maintain appropriate torsional deformation and apply corrective forces to vertebrae.
Innovation Solution
A spinal support rod kit comprising a first rod with a non-circular cross-section and a second rod with a socket and mechanical locking component, allowing for torsional alignment and fixation within a channel, even with different cross-sectional shapes, and utilizing shape memory alloys for recoverable deformation and enhanced elastic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-circular cross-section rod is used to prevent torsional rotation, then torsional alignment is improved, but the difficulty of locating the fixation device appropriately increases due to cross-section variations
Solution Approach 1:
The support rod is divided into multiple segments with different cross-sectional shapes along its length. The proximal segment has a non-circular cross-section for preventing torsional rotation, while the distal segment has a circular cross-section for ease of insertion and location. This segmentation allows each portion to optimize for its specific function.
Solution Approach 2:
Different portions of the support rod are given different cross-sectional properties. The proximal end features a non-circular cross-section to inhibit torsional rotation and maintain alignment, while the distal end has a circular cross-section to facilitate smooth insertion through the vertebral body and avoid binding. This local differentiation resolves the contradiction between alignment reliability and operational ease.
2Adaptability or versatility
If the cross-section of the rod varies along its length, then adaptability to different vertebral levels is improved, but the difficulty of maintaining appropriate torsional deformation increases
Solution Approach 1:
The rod is segmented into distinct regions: a proximal segment with non-circular cross-section for torsional stability, and a distal segment with circular cross-section for flexible insertion. This segmentation allows the rod to adapt to different vertebral levels while maintaining the ability to achieve and maintain appropriate torsional deformation in the proximal region.
Solution Approach 2:
The proximal segment is designed with a non-circular cross-section to maintain torsional deformation and provide reliable alignment, while the distal segment has a circular cross-section that does not interfere with torsional deformation. This local quality differentiation enables the rod to adapt to various vertebral levels without compromising torsional deformation maintenance.
3Reliability
If a non-circular cross-section is used in the channel, then twisting of the rod is inhibited, but the ease of fitting the rod into the channel decreases due to cross-section variation
Solution Approach 1:
The support rod is segmented such that the proximal segment has a non-circular cross-section that fits into a corresponding non-circular channel to inhibit twisting, while the distal segment has a circular cross-section that facilitates ease of insertion. This segmentation resolves the contradiction between twisting inhibition and ease of fitting.
Solution Approach 2:
The proximal end of the rod has a non-circular cross-section designed to match a non-circular channel configuration, providing reliable twisting inhibition. The distal end has a circular cross-section that simplifies the fitting process. This local quality differentiation allows the rod to be easily manufactured and fitted while maintaining twisting inhibition where required.
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 kit enables accurate torsional alignment and maintenance of corrective forces on vertebrae, accommodating cross-sectional variations and ensuring effective deformation correction, particularly in the thoracic region, through the use of shape memory alloys for enhanced elastic properties and secure fixation.
Implementation Method 1
The support rods can be made from shape memory alloys which have the property of recovering elastically towards an original undeformed configuration from which they have been deformed
Implementation Method 2
forces are then applied to the vertebrae as the rods attempt to recover elastically toward their original undeformed configuration
Data Source
AI summary
A spinal support rod kit for the treatment of spinal column shape deformations, comprises a first spinal support rod whose cross-section is non-circular at least at one end thereof and a second spinal support rod whose cross-section is circular along at least part of its length. A socket attached to the second support rod at one end is shaped so that the non-circular end of the first support rod can be received in the socket. The second support rod can include a mechanical locking component which can engage the non-circular end of the first support rod when it is inserted into the socket to prevent it from being withdrawn.