Wedge-Lock Sheath Retention for Stable Intracorporeal Deployment
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Solution Overview
Problem
There is a need for alternative medical devices and methods for securing medical devices within a sheath, particularly for intracorporeal devices such as guidewires, catheters, and medical device delivery systems, to enhance their stability and control during deployment.
Innovation Solution
A medical device system comprising a sheath with slots and a locking element that can slide over the sheath, applying a radially inward compressive force to secure a pusher wire and implant, limiting axial and rotational movement until deployment, using materials like polymers and metals for the sheath and locking element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a locking element with variable inner diameter is used to secure the sheath, then the stability and control of the medical device is improved, but the device complexity increases
Solution Approach 1:
The locking element features a variable inner diameter with different sections: a first inner diameter adjacent to the distal end and a second inner diameter adjacent to the proximal end that is smaller than the first. This local variation in geometry allows the locking element to provide enhanced stability through radial compression while maintaining manageable overall device complexity through a single integrated component design.
2Manufacturing precision
If the locking element applies radially inward compressive force to secure the pusher wire, then the control precision during deployment is improved, but the manufacturing complexity increases
Solution Approach 1:
The locking element is designed with specific geometric parameters including a variable inner diameter configuration where the second inner diameter at the proximal end is smaller than the first inner diameter at the distal end. This parameter variation enables the locking element to apply controlled radially inward compressive force on the sheath, securing the pusher wire with precise deployment control while maintaining manufacturability through conventional forming processes.
3Stability of the object's composition
If the sheath includes slots to accommodate the locking element, then the stability during deployment is improved, but the structural integrity of the sheath may be compromised
Solution Approach 1:
The sheath is segmented with slots that extend longitudinally to accommodate the locking element. These slots allow the locking element to engage and apply radial compression force to secure the pusher wire, providing stability during deployment. The segmentation creates localized interaction zones without compromising the overall structural integrity of the sheath body.
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 enhanced control and stability of medical devices within the sheath, ensuring precise deployment and reducing movement, thereby improving treatment efficacy for conditions like arterial venous malformations and other vascular diseases.
Implementation Method 1
the locking element may be configured to depress the sheath radially inwards
Data Source
AI summary
A medical device system may include a sheath, a pusher wire, and a locking element. The pusher wire may be slidably disposed within a lumen of the sheath. The locking element may have a proximal end, a distal end, an intermediate region disposed between the proximal end and the distal end, and a lumen extending from the proximal end to the distal end. The locking element may have a first inner diameter adjacent to the distal end and a second inner diameter adjacent to the proximal end, the second inner diameter smaller than the first outer diameter. The distal end region of the locking element may be configured to freely slide over the sheath and when a proximal end region of the locking element is disposed over the sheath, the locking element may be configured to depress the sheath radially inwards.