Surgical Instrument Bushing Locking Mechanism Alignment
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Solution Overview
Problem
Existing surgical instruments lack a robust locking mechanism that ensures proper alignment and secure engagement of the loading unit, which can lead to improper operation and reduced versatility in applying surgical fasteners.
Innovation Solution
A surgical instrument featuring a bushing with a transverse dimension of the distal surface between 1 to 6 times larger than the proximal end of the link, combined with a locking mechanism including a first link, spacer, connecting tube, and articulation locking member, which provides a robust engagement and prevents operation until the loading unit is properly engaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is added to ensure proper alignment and secure engagement of the loading unit, then reliability and security of operation are improved, but device complexity increases
Solution Approach 1:
The locking mechanism is nested within the existing instrument structure, with the bushing integrated into the elongated body and the link mechanism contained within the handle assembly. This nesting approach allows the locking function to be added without significantly increasing external dimensions or overall structural complexity.
Solution Approach 2:
The bushing acts as an intermediary element between the loading unit and the elongated body, providing a standardized interface that ensures proper alignment and secure engagement. This intermediary component simplifies the locking mechanism by creating a defined geometric relationship between parts.
2Measurement precision
If the transverse dimension of the bushing distal surface is increased to 1 to 6 times larger than the proximal end of the link, then rotational alignment precision is improved, but manufacturing complexity increases
Solution Approach 1:
The bushing is designed with asymmetric dimensions, where the transverse dimension of the distal surface is deliberately made 1 to 6 times larger than the proximal end of the link. This asymmetric geometry provides inherent rotational alignment features that guide proper orientation during assembly.
Solution Approach 2:
The alignment function is achieved by transitioning from one-dimensional linear engagement to two-dimensional transverse dimensional engagement. The enlarged transverse dimension of the bushing distal surface creates a geometric constraint that automatically aligns the loading unit rotationally when assembled.
3Reliability
If a locking mechanism with multiple components (bushing, link, spacer, connecting tube, articulation locking member) is implemented, then operational security is improved, but ease of assembly and repair deteriorates
Solution Approach 1:
The locking mechanism is segmented into distinct functional components (bushing, link, spacer, connecting tube, articulation locking member), each performing a specific function. This segmentation allows for modular assembly and potential replacement of individual components without requiring complete disassembly of the entire mechanism.
Solution Approach 2:
The bushing and link are pre-configured with specific geometric features (transverse dimensions, engagement surfaces) that automatically guide proper alignment during assembly. This preliminary geometric configuration reduces the skill level and time required for assembly by providing self-aligning features.
Data Source
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AI summary
A surgical instrument 10 comprising a handle assembly 12, and actuation member, an elongated body portion 30, and a locking mechanism 400 is disclosed. The locking mechanism is disposed in mechanical cooperation with the actuation member, and is configured to substantially prevent at least a partial movement of the actuation member when the elongated body portion is not engaged with a loading unit 500. The locking mechanism comprises a link 402, a bushing 460, and a connecting member 406. The link is configured for mechanical engagement with a portion of a loading unit. At least a portion of the bushing is disposed proximally of at least a portion of the link. At least a portion of the connecting member is disposed proximally of at least a portion of the bushing. Engagement between a loading unit and the elongated body portion causes proximal movement of the link, the bushing, and the connecting member.