Fossa Ovalis Penetration Catheter With Loop Wire Stabilization
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Solution Overview
Problem
Delivering therapeutic devices to the left ventricle of the heart, particularly through the fossa ovalis, poses challenges due to the need for precise puncture of the interatrial septum, which often involves thinner tissue that existing methods struggle to target accurately.
Innovation Solution
A catheter system with a braided portion and flexible longitudinal member is used to locate and stabilize the fossa ovalis, featuring lateral openings for deploying a loop-shaped wire to facilitate precise puncture, combined with a needle for creating a hole and a dilator for dilation, allowing for the delivery of therapeutic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a catheter is used to puncture the fossa ovalis, then the delivery of therapeutic devices to the left side of the heart is enabled, but the precision of puncturing the thin tissue of the fossa ovalis is difficult to achieve
Solution Approach 1:
The catheter wall is divided into multiple segments with different properties: a braided portion providing flexibility and a reinforcing tube providing rigidity. This segmentation allows each portion to perform its specific function optimally in the puncture process.
Solution Approach 2:
The catheter combines different materials with complementary properties: a braided portion (providing flexibility) and a reinforcing tube (providing rigidity). This composite structure enables the catheter to both navigate the vascular system and puncture thin tissue with precision.
2Strength
If the catheter wall is made rigid to facilitate puncture, then the puncturing capability is improved, but the flexibility to navigate the vascular system is reduced
Solution Approach 1:
The catheter is segmented into a proximal braided portion for flexibility and navigation, and a distal reinforcing tube portion for rigid puncture. This spatial segmentation allows different mechanical properties in different regions.
Solution Approach 2:
Different portions of the catheter have different mechanical properties tailored to their specific functions: the proximal portion is flexible for navigation, while the distal portion is rigid for puncture. This local differentiation resolves the contradiction between overall flexibility and local strength.
3Stability of the object's composition
If a wire is deployed to stabilize the catheter during puncture, then the puncture stability is improved, but the device complexity increases
Solution Approach 1:
The wire is pre-formed into a loop configuration and positioned within the catheter before puncture. This preliminary preparation allows the wire to immediately provide stabilization when deployed, eliminating the need for complex real-time adjustment mechanisms.
Solution Approach 2:
The loop-shaped wire acts as an intermediary element between the catheter and the fossa ovalis tissue. It provides a stable anchor point that facilitates precise puncture while distributing forces during the procedure.
Data Source
AI summary
Apparatus for puncturing a fossa ovalis includes a catheter shaped so as to define a central catheter lumen open through a catheter distal end opening. An angle between (i) a first line running between first and second lateral openings defined by the catheter and (ii) a second line that is parallel to a central longitudinal axis of the catheter when the catheter is straight, is between 30 and 150 degrees. A flexible longitudinal member passes (a) from a proximal portion of the catheter to a distal portion of the catheter, (b) out of the first lateral opening, and (c) into the second lateral opening, so as to form a loop outside the catheter. The flexible longitudinal member is configured to assume a deployment configuration in which a distal-most portion of the loop is curved and is distal to the catheter distal end opening. Other embodiments are also described.