Long Stylet Cannula Assembly for Tissue Piercing
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Solution Overview
Problem
Conventional cannula-stylet assemblies require multiple steps for positioning and verification, increasing the risk of complications and contamination during tissue piercing procedures due to the need for frequent disassembly and reassembly of the cannula, stylet, and gripping device.
Innovation Solution
A cannula-stylet assembly with a stylet significantly longer than the cannula, allowing the stylet to extend through the cannula and gripping device, enabling the gripping device to remain coupled while the stylet is removed, reducing the number of steps required for positioning and verification, and a conventionally configured assembly with a coupling component for secure reassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stylet length slightly exceeds the cannula length in conventional assemblies, then the stylet can be easily removed and reinserted, but multiple disassembly and reassembly steps are required, increasing the risk of infection and contamination
Solution Approach 1:
The stylet is segmented into two functional portions: a first portion that extends through the cannula lumen and a second portion that extends beyond the distal end of the cannula. This segmentation allows the stylet to maintain continuous connection with the cannula while enabling verification of target location, eliminating the need for complete disassembly and reassembly operations.
Solution Approach 2:
The stylet is pre-configured with a length that exceeds the cannula length before the procedure begins. This preliminary action ensures that the stylet can simultaneously fulfill multiple functions: maintaining cannula positioning, verifying target location through tissue contact, and eliminating the need for repeated disassembly/reassembly cycles during the procedure.
2Ease of operation
If the stylet is significantly longer than the cannula, then the stylet can extend through the entire assembly including the gripping device, but the assembly complexity increases
Solution Approach 1:
The extended stylet serves multiple functions simultaneously: it maintains the cannula in position during insertion, extends through the gripping device to allow continuous manipulation, and protrudes beyond the cannula to verify target location. This multi-functionality eliminates the need for separate verification instruments and reduces the number of disassembly steps required.
3Measurement precision
If the stylet length slightly exceeds the cannula length, then the distal end of the stylet can protrude beyond the cannula, but the stylet cannot extend through the gripping device, requiring uncoupling for verification
Solution Approach 1:
The stylet is divided into functional segments where the first portion extends through the cannula and the second portion extends beyond the distal end. This segmentation enables the stylet to simultaneously maintain cannula positioning and provide target verification by contacting tissue at the distal end, all while remaining connected to the gripping device for continuous manipulation.
Data Source
AI summary
A cannula-stylet assembly for piercing tissues of a subject's body includes a stylet that is significantly longer than the cannula. The length of the stylet enables introduction of the stylet through the length of both the cannula and a gripping device that has been coupled to a proximal end of the cannula. A medical piercing system may include a cannula-stylet assembly with a long stylet and a gripping device that may remain assembled with the cannula when the stylet is removed from the cannula or a gripping device that remains assembled with a stylet of a conventionally configured cannula-stylet assembly when the stylet is removed from the cannula.