Stent Retrieval Apparatus Radial Compression Mechanism
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Solution Overview
Problem
Current methods for retrieving or repositioning intraluminal prostheses like stents within body lumens often cause damage to surrounding tissue and the stent itself due to the need to pull or push fully radially expanded stents, which is inefficient and risky.
Innovation Solution
An apparatus comprising a sheath, a coupling member, and a contraction member that allows for the radial contraction of the stent, enabling its safe retrieval or repositioning by partially drawing it into the sheath, minimizing tissue and stent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biopsy forceps or snare are used to capture and pull a fully radially expanded stent, then the stent can be removed or repositioned, but surrounding tissue and the stent itself may be damaged
Solution Approach 1:
The apparatus changes the radial dimension parameter of the stent by using a contraction member to radially compress the stent from its expanded state to a compressed state, enabling safe retrieval through the delivery sheath without damaging surrounding tissue or the stent
Solution Approach 2:
The apparatus employs a nested structure where the contraction member is disposed within the delivery sheath, and the stent is first captured by the coupling member and then radially compressed by the contraction member, allowing the stent to be nested within the delivery sheath for safe removal
2Ease of operation
If a stent is kept in fully radially expanded state for retrieval, then it can be easily grasped, but it cannot be safely moved through the body lumen without causing damage
Solution Approach 1:
The coupling member is deployed from the delivery sheath before the stent is compressed, allowing it to first grasp the stent in its expanded state when the stent is most easily accessible, and then the contraction member is used to compress the stent for safe movement
Solution Approach 2:
The apparatus uses dynamic state changes of the stent, transitioning from an expanded state (easy to grasp) to a compressed state (safe for movement), with the coupling member and contraction member enabling controlled transitions between these states
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 apparatus effectively retrieves or repositions stents while minimizing damage to the stent and surrounding tissue, facilitating safer and more efficient medical procedures.
Implementation Method 1
a predetermined coupling member movement relative to the contraction member radially contracts at least a portion of the object thereby facilitating movement of the object within the body lumen
Data Source
AI summary
An apparatus for moving an object disposed within a body lumen. The apparatus includes a first sheath, a coupling member and at least one contraction member for engaging at least a portion of the object. The coupling member is movable relative to the first sheath between a retracted position and a capture position. In the retracted position, a distal portion of the coupling member is disposed within the first sheath. In the capture position, the coupling member distal portion is disposed outside the first sheath. The coupling member is also selectively attachable to the object in at least the capture position. When the coupling member is attached to the object and the contraction member is directly engaged with the object, a predetermined coupling member movement relative to the contraction member radially contracts at least a portion of the object thereby facilitating movement of the object within the body lumen.