In-Plane Rotation Cannula With Offset Cuts for Tissue Cutting
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Solution Overview
Problem
Existing surgical devices face challenges in maintaining visibility and flexibility during procedures due to line of sight issues and gross movements, leading to tissue damage and procedural inefficiency.
Innovation Solution
A surgical device with an outer and inner cannula featuring offset relieving cuts allows for 360-degree in-plane rotation, minimizing gross movements and enabling flexible manipulation while maintaining vacuum and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the cannula is bent to allow effective line of sight during use, then visibility is improved, but rotation of the end effector results in gross arc movement that swings the tissue opening into the walls of the surgical access corridor
Solution Approach 1:
The cannula is divided into multiple segments including a proximal shaft, a bendable intermediate section, and a distal shaft. The intermediate section can be bent to create an angled configuration that improves visibility of the surgical site while isolating the bending action from the distal end effector rotation, preventing gross arc movement.
Solution Approach 2:
The cannula incorporates a flexible or articulating section that allows dynamic adjustment of the angle between proximal and distal shafts. This dynamic configuration enables the surgeon to optimize visibility by bending the intermediate section while maintaining stable rotation control at the distal end effector, as the bending and rotation occur at decoupled locations.
2Measurement precision
If the instrument is extracted from the surgical field to inspect the outcome and repositioned for additional work, then procedural accuracy is improved, but repeated actions cause damage to tissues lining the surgical corridor and increase surgeon fatigue
Solution Approach 1:
The surgical device incorporates an illumination source that can be activated to illuminate the surgical site, allowing the surgeon to visually inspect the outcome without extracting the instrument. The illumination enables continuous visual monitoring while maintaining instrument position, eliminating repeated insertions and extractions that cause tissue damage and fatigue.
Solution Approach 2:
The device includes an integrated illumination system that acts as an intermediary, providing visual feedback about the surgical outcome while the instrument remains in place. This allows the surgeon to assess tissue treatment results through illumination and visualization without needing to remove and reposition the instrument, thereby maintaining procedural accuracy while improving efficiency.
3Adaptability or versatility
If the end effector is rotated while the cannula is bent, then orientation flexibility is improved, but the tissue opening moves dramatically requiring physical repositioning of the surgeon's hand, wrist, or arm
Solution Approach 1:
The cannula is segmented into a proximal shaft, a bendable intermediate section, and a distal shaft with the end effector at the tip. When the intermediate section is bent, the distal shaft and end effector can still rotate independently around the bent axis, providing orientation flexibility without causing gross movement of the tissue opening, as the rotation occurs at the distal end rather than propagating back to the surgeon's hand position.
Solution Approach 2:
The bent configuration of the intermediate section creates a spatial separation between the surgeon's hand position and the end effector rotation axis. This dimensional change allows the end effector to rotate in multiple orientations while the proximal shaft remains relatively stationary, enabling orientation flexibility without requiring the surgeon to physically reposition their hand, wrist, or arm.
Data Source
AI summary
A tissue cutting device is disclosed that allows for in-plane rotation of a distal end to avoid gross movements during surgical procedures. In one exemplary arrangement, the tissue cutting device comprises a housing, an outer cannula, and an inner cannula. The outer cannula is mounted for rotation to the handpiece. The inner cannula is mounted within the outer cannula and mounted for rotation with the outer cannula. Both the inner and outer cannula are provided with relieving cuts that are offset from one another.