Surgical Lockout Mechanism Preventing Premature Actuation
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Solution Overview
Problem
Surgical devices often face challenges in preventing premature actuation of cutting mechanisms, leading to unintended tissue injury or jamming, due to the difficulty in distinguishing between closure and cutting actuators during surgical procedures.
Innovation Solution
The implementation of a surgical device with a blocking member that obstructs access to the cutting actuator when the jaws are in the open position, allowing access only when the jaws are closed, ensuring the cutting mechanism is not actuated until tissue is properly grasped, featuring various configurations such as blocking shields, arms, and linkage mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent actuators are provided for closure and cutting functions, then the device can perform multiple functions, but the difficulty in distinguishing between actuators leads to premature cutting actuation
Solution Approach 1:
A blocking member is introduced as an intermediary element between the user's finger and the cutting actuator. This blocking member physically prevents direct access to the cutting actuator when the jaws are in the open position, thereby eliminating the confusion between closure and cutting actuators while maintaining both functions' independence
Solution Approach 2:
The blocking member is designed to be movable rather than fixed. It dynamically changes its position based on the jaw state - blocking the cutting actuator when jaws are open, and moving away to allow access when jaws are closed. This dynamic behavior adapts the interface to the current operational state
2Ease of operation
If the cutting actuator is always accessible, then ease of operation is improved, but premature actuation causes tissue injury and device jamming
Solution Approach 1:
The blocking member performs a preliminary protective action by preventing access to the cutting actuator before premature actuation can occur. When the jaws are in the open position, the blocking member is already in place to block any potential premature activation, thereby preventing tissue injury and device jamming before they can happen
Solution Approach 2:
The system performs a preliminary check through the blocking member's position before allowing cutting actuation. The blocking member must be moved away from the cutting actuator by the closure mechanism before the cutting actuator becomes accessible, ensuring the correct sequence of operations is followed
3Reliability
If a blocking member is added to prevent premature actuation, then safety is improved, but device complexity increases
Solution Approach 1:
The blocking member is merged with the closure mechanism rather than being a completely separate system. The closure actuator's movement directly controls the blocking member's position, combining two functions (closure and blocking) into an integrated system that reduces overall complexity
Solution Approach 2:
The closure mechanism automatically controls the blocking member's position without requiring separate control systems. When the closure actuator moves, it automatically positions the blocking member to either block or unblock the cutting actuator, making the system self-regulating and reducing the need for additional actuators or control mechanisms
Data Source
AI summary
Various surgical devices are provided having mechanisms for preventing premature actuation of a cutting mechanism. These devices generally include a handle having one or more actuators and an effector disposed at a distal end of the device and configured to grasp tissue. When the end effector is in an open position, a firing actuator can be positioned so that it cannot be actuated by a user. For example, the firing actuator can be obstructed by a shield or arm when the end effector is in the open position. In other embodiments, the firing actuator can be hidden in a recess formed in the closure actuator until the end effector is moved to the closed position. When the end effector is in the closed position, the firing actuator can be engaged to advance a cutting mechanism, thereby cutting the tissue grasped by the end effector.