Multi-Position Cannula Fixation Clip for Movement Stability
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Solution Overview
Problem
Cannulas tend to displace during subject movement, leading to bleeding at the cannula wound site, particularly in ECMO or CPB therapies with femoral arterial access.
Innovation Solution
A cannula fixation device with a base and a clip assembly that allows the cannula to be secured in multiple positions, including forward and rearward positions, to prevent displacement during movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the cannula is secured in a fixed position, then the cannula is stable and prevents displacement, but the cannula cannot be adjusted to accommodate subject movement
Solution Approach 1:
The fixation device transitions from a static fixed-position design to a dynamic multi-position design. The clip assembly can be selectively positioned in multiple discrete positions along the base, allowing the cannula to be secured at different locations. This dynamic adjustability resolves the contradiction by providing both stability (when secured) and adaptability (to accommodate subject movement).
Solution Approach 2:
The base is divided into multiple discrete positions where the clip assembly can be secured. Rather than a continuous adjustment mechanism, the system uses segmented positioning with distinct forward, rearward, and intermediate positions. This segmentation provides stable discrete adjustment points that resolve the contradiction between fixed stability and adjustable versatility.
2Ease of operation
If the cannula is allowed to move freely, then the device is simple and easy to operate, but the cannula displaces causing bleeding at the wound site
Solution Approach 1:
The system provides a simple two-state operation: the clip assembly is either engaged with the base (securing the cannula) or disengaged (allowing free movement). This binary engagement mechanism maintains operational simplicity while eliminating the harmful displacement effect when engaged, resolving the contradiction between ease of operation and bleeding prevention.
Solution Approach 2:
The fixation device applies a preliminary securing action by engaging the clip assembly with the base before subject movement occurs. This pre-securing prevents the harmful displacement and bleeding that would otherwise occur during movement, while requiring minimal action (simple engagement/disengagement) to activate or deactivate the protective function.
Data Source
AI summary
A cannula fixation device includes a base having a platform; a subject-interface portion having an upper surface and a lower surface, the upper surface coupled to the base and the lower surface configured to be coupled to a subject; and a clip assembly configured to retain a portion of a cannula. The clip assembly is moveably coupled to the base such that the clip assembly can be selectively positioned in a first position relative to the base or a second position relative to the base.