Retaining Device for Prosthetic Nucleus Migration Prevention
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Solution Overview
Problem
Intervertebral discs can become displaced or damaged due to trauma or disease, leading to the protrusion of the nucleus pulposus into the spinal canal, causing nerve damage and instability in the spine, and existing treatments like implants often migrate or are expelled from the disc space, necessitating tools and methods to prevent migration and promote disc repair.
Innovation Solution
A system comprising a prosthetic nucleus pulposus with a retaining device, such as a buttress plate attached to the vertebral endplate, and an augmentation instrument to secure the plate within the disc space, using materials like polymers, metals, and ceramics to prevent expulsion and maintain disc mechanics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an implant is positioned in the disc space to replace the nucleus pulposus, then the symptoms of disc deterioration are relieved, but the implant may migrate in the disc space and/or become expelled from the disc space through an annular defect
Solution Approach 1:
The retaining device is divided into multiple functional components: a mounting face for attachment to the vertebral endplate, a blocking face for preventing implant migration, and a profiled structure with mounting apertures. This segmentation allows each component to perform its specific function effectively while working together as an integrated system.
Solution Approach 2:
The retaining device is installed into the vertebral endplate before the implant is placed in the disc space. This preliminary positioning creates a pre-established barrier that prevents implant migration and expulsion from the outset, rather than attempting to correct migration after it occurs.
Solution Approach 3:
The retaining device acts as an intermediary element between the implant and the vertebral endplate. It provides a mechanical interface that secures the implant in place while distributing loads and preventing direct contact between the implant and the annular defect, thereby mediating the interaction between these components.
2Reliability
If a retaining device is installed to prevent implant migration, then implant stability is improved, but the complexity of the surgical procedure and device structure increases
Solution Approach 1:
The retaining device performs multiple functions within a single structure: it provides mechanical attachment to the vertebral endplate through the mounting face, prevents implant migration through the blocking face, and offers structural support through its profiled design with integrated mounting apertures. This multi-functionality reduces the need for separate components.
Solution Approach 2:
The mounting face and blocking face are merged into a single integrated retaining device structure rather than being separate components. This consolidation simplifies the overall device architecture while maintaining both the attachment function and the migration prevention function in one unified component.
Data Source
AI summary
An augmentation instrument for attaching a retaining device to a vertebral endplate comprises a drive housing having a distal end portion, a drive mechanism extending through the drive housing and including a flexible shaft portion, and an attachment mechanism at the distal end portion of the drive housing. The attachment mechanism is adapted for coupling to the retaining device.