Segmented Anchor Cannula Delivery System for Stable Tissue Placement
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Solution Overview
Problem
Current cannula systems face challenges in efficiently anchoring within tissues to create stable flow conduits, particularly in delicate vascular and cardiac applications, where displacement of guidewires and trauma to tissues are concerns.
Innovation Solution
A delivery system incorporating a cannula with an anchor structure that transitions from a delivery configuration to a deployed configuration, utilizing a capsule with segmented and tapered designs to facilitate secure anchoring, along with a delivery sheath and balloon catheter to ensure precise placement and minimize tissue trauma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anchor structure is deployed to secure the cannula within tissue, then the stability and positioning of the cannula is improved, but the complexity of the delivery system and deployment process increases
Solution Approach 1:
The anchor structure is divided into multiple segments that can be independently deployed from the capsule. The capsule itself is segmented to facilitate controlled deployment of anchor portions on both sides of the tissue wall, allowing complex anchoring functionality to be broken down into manageable deployment steps
Solution Approach 2:
The anchor structure is nested within the capsule during delivery, which is itself contained within the delivery catheter. This nested configuration allows the complex anchor structure to be delivered through a relatively simple catheter system, reducing the apparent complexity of the overall delivery system
2Ease of operation
If the capsule is made segmented and tapered to facilitate collapse and withdrawal, then the ease of retrieval is improved, but the manufacturing complexity increases
Solution Approach 1:
The capsule is divided into multiple segments that can collapse relative to each other during retrieval. The discontinuous circumferential segmentation allows the capsule to compress into a compact configuration for withdrawal through the cannula, facilitating easy retrieval while the segmented design can be manufactured using standard modular fabrication techniques
Solution Approach 2:
The capsule transitions from a three-dimensional expanded configuration during deployment to a compressed one-dimensional profile during retrieval. The tapered ends facilitate this dimensional transition by providing gradual compression zones that guide the collapse process, simplifying the retrieval operation
3Reliability
If the anchor structure is deployed to create stable flow conduits, then the reliability of fluid passage is improved, but the risk of tissue trauma during deployment increases
Solution Approach 1:
The balloon catheter is inflated to dilate the target location and create the opening in the tissue wall before the anchor structure is deployed. This preliminary dilation action prepares the tissue by creating a larger, more compliant opening that reduces the force required for anchor penetration and deployment, thereby minimizing tissue trauma while ensuring reliable flow conduit formation
Solution Approach 2:
The delivery system is designed to control the deployment sequence and timing, allowing the tissue to gradually adapt to the anchor structure as it is deployed. The controlled deployment from a pre-dilated opening reduces shock loading and sudden tissue displacement, cushioning the tissue from excessive trauma
4Measurement precision
If the delivery catheter is used to advance the capsule through the opening, then the precision of placement is improved, but the force required for advancement increases
Solution Approach 1:
The balloon catheter is inflated beforehand to dilate the tissue wall and create a larger opening. This preliminary action reduces the resistance to capsule advancement by removing tissue barriers, allowing the delivery catheter to advance the capsule with less force while maintaining precise placement control through the dilated pathway
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 effectively anchors the cannula within tissues, reducing the risk of kinking and trauma, while allowing for efficient deployment and retrieval, thereby enhancing vascular and cardiac function by creating stable fluid passageways.
Implementation Method 1
an anchor structure configured to transition from a first, delivery configuration to a second, deployed configuration
Implementation Method 2
a balloon catheter configured to extend through the hub and dilate a target location for the cannula and anchor structure
Implementation Method 3
the capsule includes a hydrophilic coating configured to facilitate visualization of the capsule and advancement of the capsule through the opening
Data Source
AI summary
Various aspects of the present disclosure are directed toward apparatuses, systems, and methods that may include an inflow or outflow cannula apparatus.