Surgical Suture Device Stylet Actuation
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Solution Overview
Problem
Current surgical devices face challenges in accessing and manipulating sutures in difficult-to-reach tissue locations during procedures like hernia repair, leading to increased complexity and user fatigue due to restrictions on tool size and shape.
Innovation Solution
A manually operated surgical instrument featuring a handle assembly with a longitudinal slot and a hollow shaft, where a stylet is longitudinally slideable and has a grasping member for suture engagement, allowing for precise suture placement and manipulation without rotational movement, reducing user effort and minimizing tissue trauma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional surgical device is used to access difficult-to-reach tissue locations, then the tool must be restricted in size and shape, but this leads to increased device complexity and procedure duration
Solution Approach 1:
The device is divided into distinct functional segments: a handle assembly with control mechanisms, a shaft for transmission, and a stylet with grasping member for suture manipulation. This segmentation allows each component to be optimized independently for its specific function while maintaining overall simplicity
Solution Approach 2:
The stylet is nested within the shaft, which itself is contained within the handle assembly. The grasping member on the stylet can extend from and retract into the shaft, creating a compact nested structure that reduces overall device complexity while maintaining adaptability for accessing difficult tissue locations
2Manufacturing precision
If the stylet is made longitudinally slideable for precise suture placement, then suture manipulation precision is improved, but the device may become more complex
Solution Approach 1:
The grasping member is extracted as a separate functional element on the stylet that can be independently controlled through longitudinal sliding. This extraction allows precise suture manipulation while keeping the overall device structure simple through straightforward linear movement rather than complex mechanisms
Solution Approach 2:
The stylet is designed to be dynamically movable within the shaft through longitudinal sliding, allowing the grasping member to extend and retract as needed. This dynamic capability provides precise suture placement control without requiring complex actuation mechanisms, maintaining device simplicity
3Manufacturing precision
If rotational movement of the stylet is prevented, then suture manipulation control is improved, but the ease of operation may be reduced
Solution Approach 1:
The device is designed with predetermined movement constraints that prevent rotational movement of the stylet, establishing control parameters in advance. This preliminary design decision simplifies the operational complexity by eliminating the need for the user to manage rotational degrees of freedom, making the device easier to operate while maintaining precise suture manipulation control
Data Source
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AI summary
A medical instrument (2), such as a surgical device for manipulating and placing a tissue suture and methods of using the same is disclosed. The device comprises a handle (4), a hollow shaft (12) removably coupled to the handle assembly and a stylet (14) extending within the hollow shaft and longitudinally slideable therein. Preferably, the stylet is not rotationally moveable relative to the shaft. The stylet may be moved between a first position wherein a grasping member formed on the stylet is retracted into a distal end portion of the shaft and a second position wherein the grasping member extends distally beyond the distal end portion of the shaft. Distal movement of an actuation member (32) on the handle correspondingly moves the stylet to the extended position and movement of the actuation member to a proximal position on the handle correspondingly moves the stylet to the retracted position. Lateral movement of the actuation member on the handle does not impart rotational movement of the stylet relative to the shaft dueto aactuatable unit (40) form of a hollow cylindrical member (42) and a hollow rod (46 disposed inside th cylindrical member, te stylet ecored on rod and thetrigger secured on the cylindrical member, the hollow cylindrical member rtatabl with the trigger about the hollow rod.