Vascular Cannula Snap Ring Connection System
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Solution Overview
Problem
Existing connection systems for vascular cannulas are complex and require sophisticated tools for fluid-tight connections, often leading to dead spaces where blood can coagulate, and do not allow for easy assembly or replacement of components during surgery.
Innovation Solution
A multi-component connection system featuring a radially non-expandable graft, a conduit element, and a connecting element with a radially elastically expandable snap ring for axial overlap and snap-on connection, allowing for a simple, reliable, and detachable fluid-tight connection, enabling easy assembly and potential replacement of components during surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex connection tools and systems are used to create fluid-tight connections, then connection reliability is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The connection system is divided into separate modular components: a first element with a first connection portion, a second element with a second connection portion, and a retaining element. This segmentation allows each component to be independently manufactured, stored, and assembled, reducing overall system complexity while maintaining connection reliability through specialized connection portions designed for fluid-tight seals.
Solution Approach 2:
The retaining element is designed to be self-actuating through manual manipulation. When the operator pushes the retaining element axially, the radially elastically expandable snap ring automatically beads radially outward and snaps onto the connection portions, creating a fluid-tight connection without requiring complex external tools or mechanisms.
2Reliability
If complex connection tools are used, then connection reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The retaining element is designed to be self-actuating through manual manipulation. When the operator pushes the retaining element axially, the radially elastically expandable snap ring automatically beads radially outward and snaps onto the connection portions, creating a fluid-tight connection without requiring complex external tools or mechanisms.
Solution Approach 2:
The snap ring utilizes elastic deformation as the key parameter change mechanism. In its unloaded state, the snap ring has a smaller radial dimension and can be compressed axially. When compressed and released, it elastically expands radially to snap onto the connection portions, providing a simple yet reliable connection mechanism that changes state based on applied force.
3Adaptability or versatility
If components are stored separately and assembled during surgery, then adaptability and ease of repair are improved, but loss of time increases
Solution Approach 1:
The connection system is divided into separate modular components: a first element with a first connection portion, a second element with a second connection portion, and a retaining element. This segmentation allows each component to be independently manufactured, stored, and assembled, reducing overall system complexity while maintaining connection reliability through specialized connection portions designed for fluid-tight seals.
Solution Approach 2:
The connection portions are pre-designed with complementary geometries and the retaining element is pre-configured with the snap ring in a compressed state. This preliminary preparation allows for rapid assembly during surgery, as the components are designed to snap together quickly when the retaining element is actuated, minimizing assembly time while maintaining the ability to replace individual components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides a reliable, easy-to-handle connection that prevents blood coagulation and allows for the use of different materials and procurement from various manufacturers, facilitating simplified vascular cannula creation and maintenance during surgery.
Implementation Method 1
a retaining element is equipped with a radially elastically expandable snap ring, which can be beaded radially outwardly over other parts of the retaining element, and which, in the connected state, can be snapped onto an element of the connection system
Data Source
AI summary
A connection system for creating a vascular cannula for connection to a blood vessel includes a flexible hose element in the form of a graft, a conduit element and, disposed therebetween, a connecting element establishing fluid-tight connections, wherein a retaining element is equipped with a radially outwardly elastically beadable snap ring, which, in the connected state, can be snapped in behind a detent surface of one of the parts of the connection system.