Balloon Catheter Dynamic Engaging Member for Extravascular Delivery
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Solution Overview
Problem
Current balloon catheters are limited in their ability to deliver treatment effects outside of body vessels, such as in interstitial spaces surrounding vessels, with few suitable options available for such applications.
Innovation Solution
The development of catheters with an elongate shaft, a balloon on the distal end, a guide on the balloon's surface to secure and release an engaging member, and a method involving inflation to puncture the vessel wall for delivering agents into interstitial spaces, allowing for axial movement and treatment outside the vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the balloon is inflated to affect treatment within the body vessel, then the treatment effect within the vessel is improved, but the ability to provide treatment effect outside the vessel deteriorates
Solution Approach 1:
The catheter is divided into functional segments: the balloon component for intravascular treatment and the engaging member for extravascular treatment. This segmentation allows each component to independently perform its specific function, enabling the catheter to provide both intravascular and extravascular treatment effects through sequential or combined operations
Solution Approach 2:
The engaging member transitions from a constrained state (when the balloon is uninflated) to an extended state (when the balloon is inflated). This dynamic transformation allows the engaging member to move from a retracted position to a position where it can contact and deliver treatment to the vessel wall or surrounding tissue, providing adaptability for extravascular treatment
2Measurement precision
If the engaging member is secured to maintain position during inflation, then positioning accuracy is improved, but the ability to puncture and deliver agent outside vessel deteriorates
Solution Approach 1:
The guide is pre-configured on the balloon surface to control the engaging member's position during inflation. This preliminary positioning ensures that when the balloon inflates, the engaging member is already aligned and secured in the correct position to effectively puncture the vessel wall and deliver the agent, combining positioning accuracy with operational effectiveness
Solution Approach 2:
The guide acts as an intermediary structure between the balloon and the engaging member. It maintains the engaging member in proper alignment during balloon inflation while allowing the engaging member to perform its puncture and drug delivery function, thus mediating between the need for positioning accuracy and operational capability
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
Enables effective delivery of agents into interstitial spaces by securely maintaining and releasing the engaging member as the balloon inflates, facilitating puncture and treatment outside the vessel while allowing catheter movement within the vessel.
Implementation Method 1
the balloon defining an interior chamber in fluid communication with the inflation lumen and adapted to move from an uninflated configuration to an inflated configuration as fluid moves from the inflation lumen into the interior chamber
Data Source
AI summary
The technical disclosure relates to catheters useful for engaging a vessel from within a lumen defined by the vessel. A catheter includes an elongate shaft, an inflatable balloon disposed on the distal end of the elongate shaft, a guide disposed on the external surface of the balloon, and an engaging member having a distal end releasably secured by the guide such that the guide maintains the engaging member distal end adjacent the outer surface of the balloon when the balloon is in an uninflated configuration but releases the engaging member distal end as the balloon moves from an uninflated configuration to an inflated configuration. The technical disclosure also relates to methods of using a catheter.