Nested Firing Member for Surgical Stapling Instruments
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Solution Overview
Problem
Current surgical cutting and stapling instruments face challenges in efficiently cutting and stapling tissue due to limitations in the design of staple cartridges and the interaction between the stapling instrument's components, leading to inconsistent performance and user experience.
Innovation Solution
The development of a surgical stapling instrument with a staple cartridge featuring driver retention features, a quick jaw closure system, and a high-load jaw clamping system, which includes a firing member that interacts with staple drivers to ensure consistent staple firing and tissue cutting, along with an articulation joint for enhanced maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional staple cartridge design is used, then the structure is simple, but the staple firing consistency and tissue handling performance are poor
Solution Approach 1:
The staple cartridge is divided into multiple functional components: a deck with staple cavities, individual staple drivers with retention features, and a firing member. Each component performs a specific function, allowing for improved staple firing consistency through precise control of each segment while maintaining overall structural organization.
Solution Approach 2:
The staple drivers are nested within the cartridge deck, with retention features that allow them to be securely held in place during storage and transport. The firing member is nested within the cartridge assembly, enabling compact packaging while maintaining functionality. This nesting approach improves reliability without proportionally increasing external complexity.
2Strength
If the jaw clamping system uses high load, then the tissue clamping strength is improved, but the risk of tissue damage increases
Solution Approach 1:
The jaw clamping system is designed to apply high clamping forces during the stapling operation to ensure strong tissue holding, but the system includes controlled engagement features that prevent excessive or uncontrolled force application. The dynamic nature of the closure system allows it to adapt to tissue variations while maintaining sufficient clamping strength for reliable stapling.
Solution Approach 2:
The quick jaw closure system and controlled engagement features act as protective mechanisms that prevent excessive clamping forces from being applied to the tissue. These features are designed to limit the maximum force in a controlled manner, cushioning against the harmful effects of over-clamping while still providing sufficient strength for the stapling operation.
3Manufacturing precision
If the firing member is designed for high precision staple firing, then the staple placement accuracy is improved, but the device complexity increases
Solution Approach 1:
The staple drivers are pre-positioned in the cartridge deck with retention features that ensure precise alignment before firing. The firing member is pre-configured with engagement features that guarantee accurate contact with the staple drivers. This preliminary positioning and alignment reduces the complexity of the firing mechanism itself while maintaining high staple placement accuracy through the pre-established geometric relationships between components.
Solution Approach 2:
The retention features on the staple drivers and the engagement features on the firing member act as intermediaries that transmit and control the firing force with precision. These intermediary features ensure that the firing member's motion is accurately transmitted to the staple drivers, achieving precise staple placement without requiring the entire firing mechanism to be overly complex.
4Adaptability or versatility
If the articulation joint is added for enhanced maneuverability, then the surgical flexibility is improved, but the device complexity and potential failure points increase
Solution Approach 1:
The surgical instrument is segmented into modular components including the articulation joint, which can be independently designed and manufactured. This segmentation allows the articulation joint to be optimized for surgical flexibility while keeping the rest of the device structure relatively simple. The modular approach also enables easier maintenance and reduced overall complexity by isolating the articulation system as a separate functional unit.
Data Source
AI summary
A surgical instrument comprising a first jaw, a second jaw rotatable relative to the first jaw about a pivot, and a firing system comprising a firing member is disclosed. The firing member is movable between a proximal unfired position and a distal fired position. When the firing member is in its proximal unfired position, the pivot is nested within a recess defined in the firing member. In at least one instance, the firing member comprises a tissue cutting knife. In various instances, the firing member comprises a first cam slideably positioned within the first jaw and a second cam slideably positioned within the second jaw. In at least one such instance, the second cam is contained within a chamber defined in the second jaw when the firing member is in its proximal unfired position.