Band Clamp Implants With Adjustable Tensioning for Spinal Fixation
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Solution Overview
Problem
Existing spinal fixation techniques using flexible bands lack effective tensioning instruments, leading to potential wear or loosening over time, which can cause neurological injury, especially in cases with low bone mineral density or fractured anatomy.
Innovation Solution
A system comprising a handle assembly, spool assembly, and adjustable head for applying tension to a flexible band, along with band clamp implants and tensioning instruments, allowing secure fixation to the spine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal wires are used for posterior cervical fixation, then fixation can be achieved, but the wires may wear through bone or loosen over time leading to neurological injury
Solution Approach 1:
The patent employs absorbable flexible bands made from biocompatible polymers that degrade over time after providing necessary fixation. These bands replace permanent metal wires, eliminating the risk of long-term wire migration or bone penetration while maintaining fixation stability during the critical healing period. The bands are designed to lose strength predictably as they absorb moisture and degrade, transferring load to the healing bone.
Solution Approach 2:
The invention uses composite material construction for the flexible bands, combining biocompatible polymer materials that provide both flexibility and controlled degradation properties. This composite approach allows the bands to maintain structural integrity during the immediate postoperative period while gradually degrading to avoid long-term complications associated with permanent metal fixation devices.
2Adaptability or versatility
If flexible bands are used for spinal fixation in patients with low bone mineral density, then fixation can be achieved without screws, but effective tensioning instruments are lacking
Solution Approach 1:
The patent introduces specialized tensioning instruments as intermediary tools that facilitate the application and maintenance of appropriate tension on flexible bands. These instruments serve as mediators between the surgeon and the flexible band, enabling precise control of band tension during surgery and postoperatively, thereby making the system as effective and reliable as screw-based fixation for patients with low bone mineral density.
3Manufacturing precision
If flexible bands are tensioned to correct spinal deformity, then correction can be achieved, but the bands may loosen over time without proper tensioning instruments
Solution Approach 1:
The patent incorporates feedback mechanisms through specialized tensioning instruments that allow surgeons to apply and verify appropriate tension on flexible bands during surgery. These instruments provide real-time feedback on band tension levels, ensuring optimal correction of spinal deformity while preventing under-tensioning that could lead to loosening. The system enables precise control and verification of fixation stability throughout the healing process.
Data Source
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AI summary
Implants, systems, and methods for securing a flexible band, thereby providing a desired correction to the spine. The implant may secure the flexible band to a spinal rod and/or a pedicle screw. The implant has a locking mechanism to secure the band. The band may be looped around bony anatomy and tensioned to achieve correction and provide fixation as an alternative or supplement to pedicle screws and spinal rods during spinal deformity surgery. Tensioners may be used that allow for multiple positions for attachment between the tensioner and a band clamp inserter.