Articulating Surgical Shaft Segmentation for Hernia Mesh Applicator Maneuverability
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Solution Overview
Problem
Current surgical instruments for hernia mesh attachment face challenges in ergonomics, maneuverability, and complexity during laparoscopic procedures, particularly in achieving optimal distal shaft strength and pre-defined articulation angles for simplified user experience.
Innovation Solution
An applicator instrument with an articulating shaft featuring a segmented member that can toggle between a straight and fixed angle configuration, utilizing an articulation band for tensioning and a firing system to dispense surgical fasteners, enhancing ergonomics and maneuverability while maintaining rigidity and simplifying device complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a segmented member with articulation capability is introduced to improve ergonomics and maneuverability, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The shaft is divided into multiple segments (proximal shaft section, distal shaft section, and segmented member with multiple articulating segments) that can move relative to each other. This segmentation allows the shaft to articulate at specific joints while maintaining overall structural integrity, improving maneuverability without requiring complete redesign of the entire shaft as a single complex component.
Solution Approach 2:
The shaft transitions from a static, rigid structure to a dynamic, articulating structure where the segmented member can change its configuration between straight and angled positions. This dynamic capability allows the instrument to adapt to different surgical angles and positions, enhancing ergonomics and maneuverability during laparoscopic procedures.
2Ease of operation
If an articulation mechanism is added to provide pre-defined articulation angles, then the ease of operation is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The articulation mechanism utilizes controlled changes in geometric parameters (angles, lengths) of the segmented member and articulation band to achieve pre-defined articulation angles. By designing the mechanism with specific geometric relationships, the desired articulation angles are obtained through simple mechanical geometry rather than complex control systems, facilitating easier manufacturing.
Solution Approach 2:
The articulation band automatically tensions and locks the segmented member into pre-defined angular positions through its elastic properties and geometric configuration. The mechanism self-regulates to maintain stable articulation angles without requiring external actuators or complex control systems, simplifying both manufacturing and operation.
3Ease of operation
If the outer sheath is made retractable to expose the segmented member for articulation, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The outer sheath is pre-configured to be retractable, allowing the segmented member to be exposed and articulated before the instrument is inserted into the patient's body. This preliminary articulation capability enables the surgeon to position the shaft at the desired angle prior to insertion, improving ease of operation during the procedure.
Solution Approach 2:
The outer sheath provides differential protection: it covers the segmented member during storage and transport to maintain a straight configuration, but can be retracted at the distal end to allow articulation when needed. This localized quality change enables the instrument to transition between protected and articulated states as required.
Data Source
Figure 1A~1C
Figure 2
Figure 3A~3B
AI summary
An applicator instrument for dispensing surgical fasteners includes an elongated shaft having a proximal shaft section and a distal shaft section. The proximal shaft section includes an outer sheath and the distal shaft section includes a segmented member moveable between straight and articulated configurations. A handle is secured to the proximal shaft section, and an actuator is provided on the handle that is coupled with the outer sheath. An articulation band is disposed within the outer sheath and extends from the handle to the segmented member. The articulation band has a proximal end coupled with the actuator and a distal end attached to the segmented member. The actuator is moveable in a first direction for retracting the outer sheath, exposing the segmented member, and applying tension to the articulation band for moving the segmented member into the articulated configuration. The actuator is moveable in a second, opposite direction for extending the outer sheath, covering the segmented member, and releasing the tension on the articulation band to enable the segmented member to return to the straight configuration.