Transcatheter Handle Locking Arm for Stable Valve Positioning
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Solution Overview
Problem
Existing transcatheter delivery systems face challenges in maintaining the axial position of a prosthetic valve at the target implantation site due to unwanted axial movement of the delivery device during capsule retraction, which requires frequent readjustment.
Innovation Solution
A locking mechanism is introduced to fix the axial position of the handle relative to the introducer sheath, ensuring the prosthetic valve remains stationary at the target site by coupling the handle to the introducer sheath using a locking arm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the capsule is retracted to expose the prosthetic valve, then the prosthetic valve can be deployed, but the outer shaft rubs against the introducer sheath causing axial displacement of the delivery device
Solution Approach 1:
A locking mechanism acts as an intermediary between the handle and the introducer sheath, preventing direct transmission of friction forces to the delivery device. The locking mechanism includes a locking element that engages with both the handle and the introducer sheath, creating a decoupling that eliminates the harmful friction effect while maintaining positioning precision.
2Ease of operation
If the handle is allowed to move axially during capsule retraction, then the delivery device can be repositioned, but the prosthetic valve position cannot be maintained
Solution Approach 1:
The locking mechanism transitions from a locked state during positioning (maintaining precision) to an unlocked state during repositioning (enabling operation). The locking element can be selectively engaged or disengaged from the introducer sheath, allowing the system to dynamically switch between precision maintenance and operational flexibility modes.
3Manufacturing precision
If a locking mechanism is added to prevent handle movement, then prosthetic valve position is maintained, but device complexity increases
Solution Approach 1:
The locking mechanism is segmented into separate functional components: a locking element that engages the introducer sheath, a release mechanism on the handle, and coupling elements. This segmentation allows each component to be optimized independently and simplifies the overall structure compared to a monolithic locking system.
Data Source
AI summary
A locking mechanism for a transcatheter delivery system is disclosed. As one example, the locking mechanism may comprise a first fixing member configured to be coupled to an introducer sheath, a second fixing member configured to be coupled to a handle of a delivery apparatus, and a locking arm configured to be removably coupled at a first end to one of the first fixing member and the second fixing member and fixedly or removably coupled at a second end to another one of the first fixing member and the second fixing member, wherein the locking arm is moveable between a first position where an axial position of the second fixing member is not fixed relative to the first fixing member via the locking arm and a second position where the axial position of the second fixing member is fixed relative to the first fixing member via the locking arm.