Angled Bushing Guide for Glenoid Reaming Precision
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Solution Overview
Problem
Improper reaming of the glenoid surface during shoulder replacement surgeries can lead to complications, such as the glenoid component or glenosphere being inserted at a sub-optimal angle, causing features like fixation posts or screws to penetrate the glenoid vault.
Innovation Solution
A reaming system comprising a bushing with angled external threading and a bore that guides a reamer to ream the glenoid at a precise angle, ensuring proper alignment and insertion of glenoid components, using a drill and depth gauge to create a bore, and a bushing inserter to securely position the bushing, followed by a cleanup reamer to prepare the surface for prosthetic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional reaming methods are used without specialized guiding devices, then the reaming process is simpler and faster, but the reaming angle precision deteriorates leading to sub-optimal component insertion angles
Solution Approach 1:
The bushing acts as an intermediary guiding device that interfaces between the reamer and the glenoid. It provides a precise angular reference surface that guides the reamer at the correct angle while simplifying the overall positioning process. The bushing with its specifically angled external threading serves as a mediator that translates the surgeon's insertion action into precise angular control.
Solution Approach 2:
The bushing is inserted into the glenoid cavity before the reaming operation to establish the correct angular reference in advance. This preliminary positioning ensures that when the reamer is subsequently inserted through the bushing, it automatically assumes the correct angle, eliminating the need for complex angular measurements during the reaming process itself.
2Reliability
If the glenoid is reamed at an incorrect angle, then the reaming process is faster and easier, but the fixation posts or screws penetrate the glenoid vault causing complications
Solution Approach 1:
The bushing serves as a safety intermediary that physically constrains the reamer's angular path. By providing a guiding bore with predetermined angular orientation, it ensures that the reamer can only remove bone at the safe, correct angle, preventing penetration of the glenoid vault while maintaining ease of operation through simple insertion mechanics.
Solution Approach 2:
The bushing with its specifically designed angular geometry provides a pre-established safety constraint before reaming begins. The angled external threading and internal bore configuration create a mechanical guide that cushions against incorrect angular insertion, preventing harmful penetration before it can occur.
3Manufacturing precision
If a specialized bushing with angled threading is used to guide reaming, then the reaming angle precision is improved, but the device complexity and number of components increases
Solution Approach 1:
The bushing combines multiple functions into a single integrated component: it serves as both the angular reference guide and the positioning element for the reamer. The angled external threading integrates the guidance function directly into the insertion mechanism, eliminating the need for separate alignment tools and reducing the total number of instruments required.
Solution Approach 2:
The bushing is designed as a multi-functional element that simultaneously provides angular guidance, positional reference, and mechanical support during the reaming process. Its angled threading configuration allows it to serve multiple purposes in one component, reducing overall system complexity while maintaining high precision.
Data Source
Figure 1A~1D
Figure 2A~2B
Figure 3A~3B
AI summary
Surgical instrumentation and methods for reaming a bone are disclosed. In some cases, the bone is a glenoid of a shoulder. The surgical instrumentation can include a bushing that acts as a guide for a reamer, which reams the bone.