Locking Arrangements for Detachable Shaft Assemblies
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Solution Overview
Problem
Existing surgical instruments with detachable shaft assemblies face challenges in preventing inadvertent detachment of the end effector when it is in an articulated orientation, which can lead to operational inefficiencies and safety concerns.
Innovation Solution
The implementation of a unique locking system within the interchangeable shaft assembly that prevents detachment when the end effector is articulated, utilizing a lock member and notch mechanism that ensures the shaft assembly remains securely attached during articulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shaft assembly is made detachable for ease of replacement, then the ease of operation is improved, but the reliability deteriorates due to risk of inadvertent detachment
Solution Approach 1:
The locking mechanism is pre-configured with locking surfaces and detent features that automatically engage when the shaft assembly is attached to the handle. The spring-loaded detent is pre-positioned to automatically lock the shaft in place, preventing inadvertent detachment during surgical procedures.
Solution Approach 2:
A dedicated locking mechanism acts as an intermediary between the shaft assembly and handle, providing a positive mechanical lock. The locking surfaces and detent features serve as intermediaries that transfer and secure the attachment force, ensuring reliable connection while allowing intentional detachment.
2Adaptability or versatility
If the end effector is made articulatable for increased versatility, then the adaptability is improved, but the reliability deteriorates due to increased risk of inadvertent detachment
Solution Approach 1:
The locking mechanism is pre-configured to detect and respond to articulation movements. When the end effector articulates relative to the shaft assembly, the locking surfaces automatically engage or re-engage to maintain secure attachment, preventing inadvertent detachment during articulated operation.
Solution Approach 2:
The locking mechanism is designed to be dynamic rather than static, automatically adjusting its locking engagement based on the articulation state. The spring-loaded detent and locking surfaces work together to maintain secure attachment whether the end effector is in a neutral or articulated position, enabling versatility without compromising reliability.
3Reliability
If a locking mechanism is added to prevent inadvertent detachment, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is merged with the existing articulation joint structure, combining two functions into a single integrated assembly. The locking surfaces and detent features are incorporated into the articulation joint components rather than being separate additions, thereby improving reliability without proportionally increasing overall device complexity.
Solution Approach 2:
The locking mechanism is designed to be self-actuating through spring-loaded detent features that automatically engage and disengage based on the attachment and articulation states. This eliminates the need for additional actuators, motors, or control systems, maintaining simplicity while providing reliable automatic locking functionality.
Data Source
AI summary
A surgical instrument. In one form, the surgical instrument includes a housing that has an interchangeable shaft assembly removably attached thereto. The interchangeable shaft assembly includes an elongate shaft that has a surgical end effector operably coupled thereto for selective articulation relative to the elongate shaft. An articulation system is configured to selectively apply articulation motions to the surgical end effector when the articulation system is in an actuated orientation. A locking arrangement prevents detachment of the interchangeable shaft assembly from the housing when the articulation system is in the actuated orientation.