Surgical Stapling Device Inadvertent Firing Prevention
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Solution Overview
Problem
Surgical stapling devices lack a reliable safety mechanism to prevent inadvertent firing of staples during endoscopic and laparoscopic procedures, where access to the surgical site is limited and precise control is crucial.
Innovation Solution
A surgical stapling device with a handle assembly and actuation assembly that includes a vertical pawl locking mechanism and a grasping pawl, which prevent the actuation shaft from advancing when the device is in a fully retracted position and the moveable handle is non-compressed, ensuring that staples are not fired prematurely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a surgical stapling device is designed with firing and grasping modes for endoscopic procedures, then the device can manipulate tissue and perform stapling operations, but the device risks inadvertent firing of staples during tissue manipulation
Solution Approach 1:
The safety mechanism performs preliminary action by requiring deliberate user activation through trigger depression before allowing the actuation shaft to advance and fire staples. The system prepares the device in a safe state during tissue manipulation (grasping mode) and only transitions to firing capability when the user intentionally activates the trigger, preventing inadvertent discharge during preliminary tissue positioning
Solution Approach 2:
The trigger assembly serves as an intermediary control element between the user's intent and the stapling action. The trigger mechanically mediates the transition from grasping mode to firing mode by controlling the advancement of the actuation shaft, ensuring that staple discharge only occurs when deliberately commanded by the user through proper trigger depression
2Reliability
If the actuation shaft is kept in a fully retracted position during tissue manipulation, then inadvertent firing is prevented, but the device cannot perform stapling operations
Solution Approach 1:
The actuation shaft transitions from a static fully retracted position to a dynamic state where it can be selectively advanced. The trigger mechanism enables the shaft to move distally when activated, transforming the system from a purely safe state to an active stapling state, allowing the device to switch between prevention and productivity modes as needed
3Reliability
If a safety mechanism is added to prevent inadvertent firing, then staple discharge control is improved, but the device complexity increases
Solution Approach 1:
The trigger assembly performs multiple functions: it controls the advancement of the actuation shaft, indicates the ready-to-fire state through its position, and prevents inadvertent discharge during tissue manipulation. By consolidating these safety and control functions into a single multi-functional component, the design achieves reliable staple discharge control without proportionally increasing overall device complexity
Data Source
AI summary
A surgical device includes a handle assembly, an elongated body, and a tool assembly. The handle assembly includes an actuation assembly operatively associated with an actuation shaft to advance the actuation shaft and configured to prevent advancement of the actuation shaft when the actuation shaft is in a fully retracted position and a moveable handle is in a non-compressed position and/or to prevent advancement of the actuation shaft when a grasping pawl is extended within a grasping slot of the actuation shaft. The actuation shaft including a vertical pawl locking surface near a distal end configured to engage a locking notch of a vertical pawl. The actuation assembly including a grasping pawl having a radial detent configured to engage a proximal surface of a grasping slot of the actuation shaft when the grasping pawl is positioned within the grasping slot.