Multiaxial Tether Receivers for Compact Spinal Fixation
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Solution Overview
Problem
Existing spinal fixation constructs require additional anchoring devices that increase space and complexity, are typically uniaxial, and lack adjustability, making them cumbersome for surgeons.
Innovation Solution
Multiaxial receivers with apertures for passing a tether, featuring U-shaped cavities and immobilization means like set screws or ferrules, allowing for adjustable tether immobilization and support to stabilize the spinal column.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional anchoring devices are used to secure tethers, then the tether can be immobilized, but the construct size increases and complexity increases
Solution Approach 1:
The receiver integrates multiple functions into a single device: it provides structural support for the spinal construct, contains built-in apertures for tether passage, and includes immobilization mechanisms (set screw or ferrule) all within one component. This merging eliminates the need for separate anchoring devices while maintaining reliable tether securation.
Solution Approach 2:
The receiver serves multiple purposes: it acts as a structural connector in the spinal fixation construct, provides pathways for tether insertion and passage, and incorporates immobilization features. This multi-functionality reduces the total number of components needed while ensuring reliable tether attachment.
2Reliability
If additional anchoring devices are used to secure tethers, then the tether can be immobilized, but the space occupied by the construct increases
Solution Approach 1:
The receiver combines structural support and tether anchoring functions into one compact component. The apertures are integrated into the receiver body, and the immobilization mechanism (set screw or ferrule) is incorporated within the same device, eliminating the need for additional space-consuming anchoring devices.
3Device complexity
If uniaxial anchoring devices are used, then the structure is simple, but adjustability is limited
Solution Approach 1:
The receiver provides adjustability in multiple dimensions: it can accommodate tethers passing through apertures in different orientations (anterior, lateral, posterior aspects), and the immobilization mechanism can secure tethers at various positions. This multi-dimensional capability enhances adaptability while maintaining structural simplicity.
Data Source
AI summary
Various multiaxial receivers for receiving at least one tether are disclosed. A multiaxial receiver may include a body having a U-shaped cavity configured to receive a longitudinal rod therein and a lower cavity configured to couple to a pedicle screw. The body may include a first aperture extending through a side surface of the body and defining a first passageway configured to permit a tether to pass therethrough in the horizontal direction. In some embodiments, the body may include a second aperture extending through the side surface of the body and defining a second passageway configured to permit the tether to pass therethrough in the horizontal direction. A set screw may be configured to be rotated from an open position in which the tether is permitted to pass through the first passageway and optionally through the second passageway to a closed position in which the tether is immobilized.