Delivery device for heart valve prosthesis, threading member and handle of delivery device, and recovery device and delivery device for recovery threads of heart valve prosthesis
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Solution Overview
Problem
Existing delivery devices for heart valve prostheses face challenges in achieving accurate circumferential rotation and positioning, leading to operational inconvenience and increased surgical risk due to imprecise implantation, and difficulties in adjusting the local position of the prosthesis relative to the heart, which reduces surgical success rates.
Innovation Solution
The delivery device incorporates a threading member with a threading through hole and positioning area, allowing for precise adjustment of the heart valve prosthesis's position through traction members, and a retrieval device with a suture winding/unwinding assembly for fine-tuning implantation accuracy, along with a handle that facilitates circumferential positioning and axial movement of the prosthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing delivery devices are used to transport and deploy the heart valve prosthesis, then the prosthesis can be implanted through minimally invasive interventional surgery, but the devices cannot achieve circumferential rotation of the prosthesis, leading to low accuracy in deployment positioning
Solution Approach 1:
The delivery device is divided into multiple functional components including an outer tube, inner tube, threading member, and handle assembly. The inner tube can rotate independently within the outer tube, allowing circumferential rotation of the prosthesis while maintaining the overall delivery system structure. This segmentation enables independent rotation control for precise positioning.
Solution Approach 2:
The threading member acts as an intermediary component between the handle and the prosthesis. It includes threading through holes that guide traction members, enabling precise control of the prosthesis position and orientation during deployment. The threading member translates rotational motion from the handle into precise positioning adjustments.
2Ease of operation
If the operating handle is rotated to implant the valve prosthesis, then the prosthesis can be positioned, but the operation direction must be adjusted accordingly, causing operational inconvenience
Solution Approach 1:
The handle assembly incorporates circumferential rotation capability in addition to axial movement. The inner tube can rotate within the outer tube, allowing the operator to adjust the prosthesis orientation in the circumferential dimension without changing the operational direction. This adds a rotational dimension to the control mechanism.
Solution Approach 2:
The handle assembly serves multiple functions: it provides axial movement for deployment, circumferential rotation for orientation adjustment, and maintains a consistent operational direction. The threading member with positioning areas enables both positioning and orientation control through the same handle structure, reducing the need for separate adjustment operations.
3Reliability
If the implantation position of the heart valve prosthesis is inaccurate, then adjustment is needed, but it is difficult to adjust the position of the prosthesis relative to the heart, thereby increasing the surgical risk
Solution Approach 1:
The threading member includes pre-configured threading through holes and positioning areas that enable easy adjustment if positioning is inaccurate. The traction members are pre-routed through these holes, allowing quick repositioning by simply pulling or pushing the traction members without complex manipulation. This preliminary configuration ensures adjustment capability is readily available.
Solution Approach 2:
The positioning areas on the threading member provide visual and tactile feedback to the operator during deployment. The threading through holes are positioned to indicate the correct orientation and position of the prosthesis. If the prosthesis is not correctly positioned, the feedback mechanism allows the operator to detect the misalignment and make appropriate adjustments through the handle.
4Productivity
If multiple connection rings are tightened simultaneously during retrieval, then the prosthesis can be re-housed, but they may not lock into the clamping grooves synchronously, thus preventing retrieval
Solution Approach 1:
The retrieval mechanism uses multiple independent clamping grooves on the outer tube, each corresponding to a connection ring. These grooves can engage the rings independently and asynchronously, allowing flexible retrieval without requiring simultaneous locking of all rings. The segmentation of the clamping mechanism enables progressive engagement.
Solution Approach 2:
The clamping grooves are designed with dynamic engagement characteristics, allowing them to adapt to the timing and position of each connection ring during retrieval. The grooves can lock into the rings at different times as the prosthesis is re-housed, providing a dynamic rather than rigid synchronous locking mechanism. This dynamic design ensures reliable retrieval even with timing variations.
Data Source
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AI summary
An interventional delivery device for a heart valve prosthesis, and a threading member (101) of the delivery device. The interventional delivery device for the heart valve prosthesis comprises: an outer tube (103); an inner tube (102) located in the outer tube (103); a threading member (101) provided on the inner tube (102), the threading member (101) being provided with a threading hole (114) and a positioning portion (111); a suture end positioning member (105), one end of the suture end positioning member (105) being detachably positioned in the positioning portion (111) of the threading member (101); and a traction member (106), one end of the traction member (106) passing through the threading hole (114) to be connected to a heart valve prosthesis (104) and to be connected to the suture end positioning member (105), and the other end of the traction member extending out of the outer tube (103). By means of such an arrangement, the relative position of the heart valve prosthesis (104) and the heart can be adjusted, thereby improving the implantation accuracy of the heart valve prosthesis (104).