Glenoidal Component Asymmetric Axis Shoulder Prosthesis
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Solution Overview
Problem
Conventional shoulder prostheses face challenges in maintaining correct positioning of the convex articular surface when the glenoid cavity is damaged or worn out, leading to limited arm movement due to misalignment of the resectioned surface and the spinal column axis.
Innovation Solution
A glenoidal component with a convex surface centered on a non-perpendicular axis of symmetry, allowing the articular surface to be inclined and oriented correctly, even when the glenoid cavity's resectioned surface is not parallel to the spinal column, using a base with a planar front face and a rear face that form an angle, and an anchoring stem that extends non-perpendicularly, enabling compensation for defects in parallelism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the axis of symmetry of the convex articular surface is made perpendicular to the rear face of the component, then the component structure is simple and manufacturing is easy, but the articular surface cannot be correctly oriented when the glenoid cavity is damaged or worn out
Solution Approach 1:
The patent applies asymmetry by making the axis of symmetry of the convex articular surface non-perpendicular to the rear face of the component. Specifically, the axis of symmetry forms an angle between 5° and 15° with the perpendicular to the rear face, allowing the articular surface to be correctly oriented relative to the patient's spinal column even when the glenoid cavity is damaged or worn out. This asymmetric design enables the component to adapt to various pathological conditions while maintaining proper biomechanical alignment.
2Device complexity
If the base is provided with parallel front and rear faces, then the component structure is simple, but the articular surface cannot be correctly positioned when the resectioned surface is not parallel to the spinal column axis
Solution Approach 1:
The patent makes the front and rear faces of the base non-parallel to each other. The angle between these faces is designed to compensate for the angular defect between the resectioned glenoid surface and the spinal column axis. This asymmetric configuration of the base allows correct positioning of the articular surface while maintaining relatively simple manufacturing processes.
3Device complexity
If the anchoring stem is oriented perpendicularly to the rear face, then the component structure is simple, but correct implantation orientation cannot be achieved when the glenoid cavity is damaged
Solution Approach 1:
The anchoring stem is designed with asymmetric orientation, extending at an angle between 5° and 15° relative to the perpendicular of the rear face. This asymmetric orientation of the stem allows it to be correctly positioned relative to the patient's spinal column and anatomical structures, ensuring reliable implantation even when the glenoid cavity is damaged or worn out, while maintaining relatively simple component structure.
Data Source
AI summary
This glenoidal component for a shoulder prosthesis comprises a base which may be immobilized on the glenoid cavity of a shoulder, and an element provided to be mounted on this base and forming a convex surface of articulation centered on an axis of symmetry. This axis of symmetry is non-perpendicular to a rear face of the base intended to abut against the glenoid cavity, this making it possible to compensate a defect in parallelism between the resectioned surface of the glenoid cavity and the axis of the patient's spinal column. A surgeon can select the component most adapted to the orientation of the resectioned surface from a set of components in which the axes of symmetry of the components are oriented differently with respect to their rear faces.