Conveyor Self-Locking Mechanism for Valve Prosthesis Loading
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Solution Overview
Problem
Conventional methods for loading and releasing valve prostheses into conveying catheters are hindered by the high radial supporting force of the valve stent, leading to deformation of the catheter and increased difficulty in surgical procedures.
Innovation Solution
A conveyor system with a lumen assembly and self-locking mechanism, featuring a recovery sheath and outer sheath that compress the valve stent to reduce its radial size, allowing for easier loading and release by maintaining the sheath stationary relative to the inner core tube, thereby reducing friction and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the valve prosthesis is loaded into the conveying catheter in its normal expanded state, then the valve prosthesis can be delivered to the implantation site, but the high radial supporting force of the valve stent causes the conveying catheter to deform and makes loading difficult
Solution Approach 1:
The valve prosthesis is compressed into a crimped state before loading into the conveying catheter. This preliminary compression action reduces the radial supporting force, allowing the catheter to be loaded without deformation. The compression is maintained throughout the conveying process and only released at the implantation site.
Solution Approach 2:
The radial size of the valve prosthesis is changed from its normal expanded state to a compressed crimped state during loading. This parameter change (reduction in radial dimension) allows the valve prosthesis to pass through the conveying catheter without generating excessive radial forces that would cause catheter deformation.
2Ease of operation
If the valve prosthesis is released from the conveying catheter during the operation process, then the valve prosthesis can be deployed at the implantation site, but the high radial supporting force makes release difficult
Solution Approach 1:
The valve prosthesis is compressed into a crimped state during the conveying process, which maintains a low radial supporting force. This preliminary compressed state facilitates easy release from the conveying catheter at the implantation site, as the valve prosthesis does not exert high radial forces that would make release difficult.
Solution Approach 2:
The valve prosthesis is released from the conveying catheter while in a compressed crimped state. This parameter change (maintaining compression during release) reduces the radial supporting force, making the release process easier compared to releasing an expanded valve prosthesis.
3Productivity
If the conveying catheter is used to convey the valve prosthesis, then the valve prosthesis can be delivered to the implantation site, but the high radial supporting force causes the catheter to deform
Solution Approach 1:
The valve prosthesis is compressed into a crimped state before loading into the conveying catheter. This preliminary compression action ensures that the valve prosthesis does not exert high radial forces on the catheter during conveying, preventing catheter deformation and maintaining structural stability.
Solution Approach 2:
The radial dimension of the valve prosthesis is reduced through compression during the conveying process. This parameter change ensures that the valve prosthesis can be conveyed through the catheter without generating excessive radial forces that would cause catheter deformation, thereby maintaining catheter structural stability.
Data Source
AI summary
A conveyor and a conveyor system are provided. The conveyor comprises a lumen assembly and a self-locking mechanism connected to the lumen assembly, wherein the lumen assembly comprises an inner core tube, a recovery sheath movably surrounding the inner core tube, and an outer sheath movably surrounding the recovery sheath; the self-locking mechanism is connected to the recovery sheath; and the outer sheath can move relative to the inner core tube in an axial direction of the conveyor. The self-locking mechanism has a self-locked state and an unlocked state, wherein when the self-locking mechanism is in the unlocked state, the recovery sheath can move relative to the inner core tube in the axial direction of the conveyor; and when the self-locking mechanism is in the self-locked state, the recovery sheath maintains stationary relative to the inner core tube.