Surgical Stapler Lockout Assembly for Premature Firing Prevention
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Solution Overview
Problem
Existing surgical stapling apparatus lack a mechanism to prevent firing when reusable and disposable components are not properly secured, leading to potential misfiring or improper staple formation.
Innovation Solution
Incorporation of a lockout assembly with a stopper and spring unit that engages the push plate to prevent movement when the anvil and cartridge receiving half-sections are not secured together, allowing secure firing only when properly clamped.
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 is nested within the elongated channel member, with the stopper positioned inside the channel and the push plate integrating with the firing mechanism. This nested configuration allows the lockout function to be incorporated without significantly increasing the overall device footprint or external complexity.
Solution Approach 2:
The stopper acts as an intermediary element between the push plate and the distal end of the channel. It mediates the interaction by physically blocking the push plate's distal movement when properly positioned, thereby preventing accidental firing while maintaining a relatively simple overall structure.
2Reliability
If the push plate is locked in position, then safety is improved, but ease of operation deteriorates due to additional locking/unlocking steps
Solution Approach 1:
The lockout assembly is pre-configured with the stopper positioned to block the push plate's distal movement. The resilient nature of the stopper allows it to automatically engage or disengage based on the presence or absence of the SULU, eliminating the need for manual locking or unlocking actions by the operator.
Solution Approach 2:
The lockout mechanism is self-regulating through the resilient stopper's automatic engagement and disengagement. When the SULU is properly installed, the stopper automatically disengages to allow firing; when the SULU is absent or improperly installed, the stopper automatically engages to prevent firing, without requiring operator intervention.
3Reliability
If the lockout assembly prevents distal movement of the push plate, then safety is improved, but productivity decreases due to additional safety checks
Solution Approach 1:
The lockout assembly performs automatic safety verification through the resilient stopper's engagement state. The system self-checks whether the SULU is properly installed and ready for firing, eliminating the need for separate manual safety checks by the operator and maintaining procedural efficiency.
Solution Approach 2:
The safety verification is built into the preliminary configuration of the device. The stopper is pre-positioned to allow or prevent firing based on SULU installation status, so the safety check occurs automatically as part of the setup process rather than as a separate step during the procedure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures safe and reliable staple firing by preventing misfiring when components are not correctly assembled, enhancing the safety and functionality of the surgical stapling apparatus.
Implementation Method 1
The spring unit may include a leaf spring that contacts the push plate and biases the push plate in a locked position. The leaf spring may be positioned to move between a first position and a second position
Data Source
AI summary
A surgical stapling 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 configured to receive a single use loading unit (SULU). The lockout assembly is supported in the elongated channel member and includes a lockout assembly that is selectively engageable with the push plate to prevent movement of the push plate relative to the lockout assembly when the anvil half-section and the cartridge receiving half-section are not secured together.