Interlocking Collet Wings for Stable Cannula 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 features on gripping elements, utilizing a collet with latches and couplers to secure collet wings together, enhancing stability and grip on the vessel.
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 (first collet wing, second collet wing, etc.) that can be separately positioned and secured. Each wing can be independently attached to the cannula and secured to adjacent wings through latches and couplers, distributing the clamping function across multiple segments rather than relying on a single flexing cantilever structure.
Solution Approach 2:
The latches and couplers are pre-configured on the collet wings to enable secure interlocking. The latches are defined on distal ends of collet wings and the couplers are defined on distal ends of other collet wings, allowing the wings to be pre-positioned and then securely locked together before full deployment, ensuring grip stability is established in advance.
2Reliability
If interlocking features with latches and couplers are added to collet wings, then the grip stability and security of attachment are improved, but the device complexity increases
Solution Approach 1:
The latch and coupler features are integrated directly into the collet wing structures themselves. The latch is defined on the distal end of one collet wing and the coupler is defined on the distal end of another collet wing, merging the securing mechanism with the clamping elements rather than adding separate independent components. This reduces overall device complexity while maintaining attachment security.
3Manufacturing precision
If multiple collet wings are used to surround the cannula, then the cannula stability and positioning accuracy are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Each collet wing is designed with both clamping functionality and integrated securing features (latches or couplers). The same basic wing structure serves multiple purposes: positioning the cannula, applying radial compression, and interlocking with adjacent wings. This multi-functionality reduces the need for separate components, simplifying manufacturing while maintaining precise cannula positioning.
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.