Surgical Fastener Lockout Assembly for Unloaded Firing Prevention
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Solution Overview
Problem
Existing surgical fastener applying apparatuses lack a mechanism to prevent accidental firing when a single-use loading unit is not properly loaded, leading to potential misuse or inefficiency.
Innovation Solution
Incorporation of a lockout assembly with a pivotally coupled lockout that engages with the push plate to prevent movement when the single-use loading unit is not in place, ensuring the apparatus cannot fire until the unit is correctly installed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lockout assembly is added to prevent accidental firing, then safety and reliability are improved, but device complexity increases
Solution Approach 1:
The lockout assembly acts as an intermediary component between the push plate and the firing mechanism. It includes a lockout member with a passage that must be cleared by the push plate to enable firing. This intermediary structure prevents direct firing when the loading unit is absent, thereby improving safety without requiring complex electronic or sensing systems.
Solution Approach 2:
The lockout assembly is designed to be engaged in advance before firing can occur. The lockout member is positioned to obstruct the push plate's path until the loading unit is properly installed and removes the obstruction. This preliminary blocking action ensures that firing conditions are verified before the actual firing process can initiate.
2Reliability
If a lockout mechanism is implemented to prevent firing without loading unit, then operational reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The lockout assembly is designed to automatically transition from a locked to an unlocked state through self-service mechanisms. When the loading unit is installed, its components (such as the ejection member or guide structure) automatically interact with the lockout member to clear the passage and enable firing. The system serves itself by using the presence of the loading unit to trigger the unlock condition without requiring separate manual intervention.
3Object-affected harmful factors
If the lockout assembly constrains the push plate movement, then prevention of misuse is improved, but device complexity increases
Solution Approach 1:
The lockout assembly is segmented into distinct functional elements: a lockout member with a defined passage, engagement features that interact with the loading unit, and spring mechanisms for maintaining the locked position. This segmentation allows each component to perform its specific function independently, simplifying the overall design while effectively preventing misuse through the constrained push plate movement.
Data Source
AI summary
The surgical fastener applying apparatus includes an anvil half-section, a cartridge receiving half-section, a firing assembly including a push plate, and a lockout assembly. The cartridge receiving half-section defines an elongated channel member. The elongated channel member is configured to receive a single use loading unit (SULU). The lockout assembly is supported in the elongated channel member and includes a lockout that is selectively engageable with the push plate to prevent movement of the push plate relative to the lockout when the SULU is not supported in the elongated channel member.