Cannulation Device With Retractable Wedge for Minimally Invasive Vessel Access
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Solution Overview
Problem
Minimally invasive surgical techniques pose challenges in efficiently establishing cannulation due to small access sites, making it difficult or preventing the use of these techniques for placing cannulas in vessels, which delays surgeries and increases trauma.
Innovation Solution
A cannulation device with a fixed blade, retractable wedge, and adjustment nut that allows for efficient cannula placement by aligning and extending the retractable wedge with the fixed blade to pierce the vessel, facilitating the insertion of a cannula through a minimally invasive access site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cannulation methods are used, then cannula placement is reliable, but surgery time increases and patient trauma increases due to large access sites
Solution Approach 1:
The device pre-assembles the cannula, fixed blade, and retractable wedge into an integrated unit before surgery. The blades are pre-positioned and the retractable wedge is prepared in advance, allowing immediate deployment through minimally invasive access without time-consuming assembly during surgery
Solution Approach 2:
The retractable wedge is nested within the cannula body, and the fixed blade is integrated into the cannula structure. This nesting allows the device to pass through small access sites in a compact form while maintaining full functionality for reliable cannula placement
2Reliability
If traditional cannulation methods are used, then cannula placement is secure, but patient trauma increases due to large access sites
Solution Approach 1:
The nested structure allows the cannula and blades to be contained within a compact delivery system that fits through small access sites, minimizing tissue disruption while maintaining secure cannula placement through the integrated blade structure
Solution Approach 2:
The device concentrates the invasive action to specific localized points where the blades pierce the vessel, while the rest of the access site remains minimal. The cannula provides localized secure anchoring without requiring extensive surgical exposure
3Object-affected harmful factors
If minimally invasive techniques are used, then patient trauma is reduced, but cannula placement becomes difficult or impossible
Solution Approach 1:
The entire cannulation system is nested within a delivery catheter that can be inserted through small puncture sites. The device maintains ease of operation by allowing the surgeon to deploy the blades and cannula through simple manual manipulation or actuation mechanisms accessible through the minimal access site
Solution Approach 2:
The delivery catheter acts as an intermediary that facilitates the passage of the cannula and blades through minimally invasive access. The catheter protects the blades during insertion and provides a controlled mechanism for deployment, making the procedure easy to perform through small openings
4Duration of action of stationary object
If minimally invasive techniques are used, then recovery time is reduced, but surgery time increases due to difficult cannulation
Solution Approach 1:
The device is pre-assembled with all components (cannula, blades, retractable wedge) prepared before surgery begins. This eliminates time-consuming assembly steps during the procedure, allowing minimally invasive access to be maintained throughout while keeping surgery time short
Solution Approach 2:
The device is designed as segmented modular components that can be easily deployed in sequence through the minimal access site. The segmentation allows for quick assembly and deployment without requiring extensive surgical exposure, maintaining both short surgery time and minimal recovery time
Data Source
AI summary
A cannulation device is disclosed, having a fixed blade, a retractable wedge, and an adjustment nut for mating with a cannula or a cannula assembly. Another cannulation device is disclosed, having a tube with proximal and distal ends. The fixed blade, coupled to the distal end of the tube, comprises a transition edge configured to cover a lead edge of a cannula. The cannulation device has a control rod movable within the tube; a retractable wedge; an actuator coupled to the control rod; and is configured to move the retractable wedge from a piercing position, where the retractable wedge is aligned with the fixed blade, to a retracted position where the retractable wedge has been retracted within the tube. The cannulation device has a cannula adapter and an adjustment nut movable to change a distance between the adjustment nut and the fixed blade.