Polyaxial Screw Angular Adjustment Spinal Fixation
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Solution Overview
Problem
Current spinal surgical procedures often require invasive methods that alter spinal anatomy and function irreversibly, and existing bone-anchoring devices lack the flexibility to be implanted at various angles, limiting their applicability in treating spinal disorders at early stages or for dynamic movement systems.
Innovation Solution
A polyaxial screw system comprising a threaded shaft, a cup-shaped head with a spherical linking member, and a rod connector that allows angular adjustment and controlled movement, enabling secure attachment of implantable rods to bone tissue while accommodating various configurations and mobility needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional bone-anchoring devices are used, then the procedure is simple and direct, but the device lacks flexibility to be implanted at various angles and cannot accommodate dynamic movement
Solution Approach 1:
The bone-anchoring device is divided into separate functional components: a polyaxial screw for angular adjustment, a rod connector for securing the implantable rod, and a linking member that connects them. This segmentation allows each component to perform its specific function independently, enabling angular adjustment while maintaining overall device manageability.
Solution Approach 2:
The device incorporates a polyaxial screw mechanism that allows dynamic angular adjustment during implantation. The linking member can rotate within the cup-shaped cavity of the screw head, providing controlled movement and adaptability to accommodate various anatomical configurations and dynamic spinal movement requirements.
2Reliability
If invasive surgical procedures are used to correct spinal disorders, then the underlying structural problems can be addressed, but the procedures significantly alter spinal anatomy and function irreversibly
Solution Approach 1:
The device allows for parameter changes in terms of angular orientation and positioning during implantation. The polyaxial screw enables adjustment of the implant angle to optimize spinal alignment and correction effectiveness while minimizing disruption to surrounding anatomical structures. This adaptability allows surgeons to tailor the procedure to each patient's specific anatomical constraints.
3Stability of the object's composition
If spinal fusion surgery is performed to treat severe spinal conditions, then vertebral stability is improved, but vertebral range-of-motion is significantly reduced and the procedure is irreversible
Solution Approach 1:
The device incorporates dynamic elements that allow for controlled movement and adjustment. The polyaxial screw mechanism and linking member assembly enable the spinal construct to accommodate physiological motion while maintaining stability. This dynamic design preserves some degree of spinal range-of-motion compared to traditional rigid fusion constructs, allowing the spine to move more naturally while still providing structural support.
Data Source
AI summary
A bone-anchoring device is provided. The bone-anchoring device may comprise a screw including a threaded shaft portion configured to engage bone tissue, and a head portion having a cup-shaped cavity. The device may further include a rod connector and a linking member, wherein the linking member includes a spherical head portion configured to engage the cup-shaped cavity of the head of the screw, a widened flange s configured to engage the linking member, and an elongate body extending from the widened flange portion and configured to extend through an opening in the rod connector.