Interlocking Cannula Collet Latch for Secure Vessel Attachment
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Solution Overview
Problem
Current cannula attachment technologies for anatomical vessels rely on cantilevered clamping features that result in a loss of compression and grip, necessitating a more secure attachment mechanism.
Innovation Solution
The development of a cannula system with interlocking collet wings featuring latches and couplers that secure the collet wings together, eliminating dependence on cantilevered clamping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cantilevered clamping features are used for cannula attachment, then the attachment mechanism is simple and quick to apply, but the compression and grip on the tissue are lost due to flexing
Solution Approach 1:
The collet is divided into multiple independent wings (typically three) that can be positioned around the cannula and vessel separately. Each wing can be independently actuated to clamp down, allowing for secure attachment without requiring the entire structure to be a rigid cantilever, thus maintaining grip stability while enabling quick application.
Solution Approach 2:
A sutureless attachment mechanism is introduced as an intermediary between the cannula and the vessel wall. This mechanism uses the collet wings with latches that engage with the vessel wall or surrounding tissue, providing secure attachment without sutures while maintaining compression and grip through the latch engagement rather than relying on cantilever flexing.
2Reliability
If suture attachment is used for cannula fixation, then secure attachment is achieved, but the procedure requires multiple hands and cannot be done quickly
Solution Approach 1:
The collet wings are designed with self-latching mechanisms where the wings automatically engage with the vessel wall or surrounding tissue when compressed. The latches on the collet wings engage with corresponding features on the vessel wall, creating a self-securing attachment that does not require sutures or multiple hands to tie knots, enabling quick single-hand operation while maintaining secure attachment.
3Device complexity
If cantilevered clamping is used, then the device structure is simple, but the compression force is lost due to flexing of the cantilever
Solution Approach 1:
The collet wings are designed to be dynamic structures that can transition from an open state during insertion to a closed clamping state once positioned. The wings flex during insertion to pass through the vessel wall, then engage and lock in place using latches that maintain compression force without continuous cantilever flexing. This dynamic design allows simple structure during insertion while maintaining strong compression force during attachment.
Data Source
AI summary
A cannula system for cannulating a blood vessel comprising a collet comprising at least a first collet wing and a second collet wing and defining a collet lumen, where each of the first collet wing and the second collet wing define a distal end and a proximal end; a cannula positioned within the collet lumen; a latch defined on the distal end of the first collet wing; and a coupler defined on the distal end of the second collet wing and configured to couple to the latch of the first collet wing, thereby securing the first collet wing to the second collet wing.