Prosthesis Delivery System Radial Tether Holder
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Solution Overview
Problem
Existing percutaneous delivery systems for prosthetic heart valves face challenges in achieving a fully compressed state to navigate tortuous vascular paths, risk of the valve catching on the sheath and jamming, and potential damage during insertion.
Innovation Solution
A prosthesis delivery system utilizing a sheath with movable tethers and a holder that constrains the tethers radially, allowing partial expansion and controlled collapse of the prosthesis to prevent jamming and ensure safe insertion, with the option to detach tethers for final positioning and expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the prosthesis is collapsed to a compressed state to fit within the sheath, then the prosthesis can be delivered through the vascular system, but the prosthesis may catch on the sheath rim and jam during insertion
Solution Approach 1:
The prosthesis is partially collapsed before insertion into the sheath, creating a tapered configuration that facilitates smooth entry. The apexes are pulled together to compress the prosthesis into a shape that fits within the sheath opening, preventing jamming during the insertion process.
Solution Approach 2:
The prosthesis is divided into multiple collapsible elements or segments that can be independently compressed. This segmentation allows the prosthesis to be folded into a compact configuration that fits within the sheath while maintaining the ability to expand properly once deployed.
2Ease of operation
If the prosthesis is fully collapsed to fit within the sheath, then the prosthesis can be delivered to the target position, but the prosthesis may get damaged or destroyed during insertion
Solution Approach 1:
The prosthesis is partially collapsed before insertion to create a tapered configuration that reduces stress on the structure during entry into the sheath. This preliminary compression prevents excessive forces that could damage the prosthesis while still enabling delivery to the target position.
Solution Approach 2:
The sheath and delivery system are designed to provide protective cushioning during the insertion process. The controlled collapse mechanism and sheath configuration prevent direct impact and excessive stress on the prosthesis, protecting it from damage during delivery.
3Volume of moving object
If the prosthesis is collapsed to a compressed state, then the prosthesis can be inserted into the sheath, but achieving full compression is difficult and time-consuming
Solution Approach 1:
The prosthesis is partially collapsed before insertion to create a tapered configuration that facilitates smooth entry. The apexes are pulled together to compress the prosthesis into a shape that fits within the sheath opening, preventing jamming during the insertion process.
Solution Approach 2:
The prosthesis incorporates dynamic collapse mechanisms that allow for rapid compression. The collapsible elements can be quickly folded together through controlled manipulation, reducing the time required to achieve full compression while maintaining the ability to expand properly once deployed.
Data Source
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AI summary
A prosthesis delivery system comprises a sheath defining an axial direction; at least one tether movable axially relative to the sheath; and a holder movable axially within the sheath, configured to constrain radially the tether(s). Collapsing the prosthesis to a collapsed state in the sheath involves constraining radially with a holder the tether(s), attached to the prosthesis; and moving the tether(s) and the holder axially within the sheath such that the prosthesis is forced to collapse into the sheath and the holder is retracted into the sheath.