Implant Delivery System with Screw-Driven Position Compensation
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Solution Overview
Problem
Current implant delivery systems fail to accurately position self-expanding implants due to shortening and displacement during expansion, leading to incomplete treatment of stenosis or occlusive lesions.
Innovation Solution
An implant delivery system with a handle, first and second inner sliding members, an outer tube, and a jacking tube, where the handle drives these components to move in opposite directions via screw transmission, allowing precise control over the implant's release and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the implant is released and expanded in the conventional delivery system, then the implant expands to provide radial support force, but the implant shortens in length and displaces from the predetermined position
Solution Approach 1:
The delivery system is divided into multiple functional segments: outer tube for compression, jacking tube for positioning, inner tube for guide wire reception, and handle with sliding members for controlled deployment. This segmentation allows each component to perform its specific function independently, enabling precise positioning while maintaining implant strength.
Solution Approach 2:
The jacking tube is pre-installed in the outer tube with its position fixed, and is configured to hold the implant before expansion. The handle is threadedly matched with inner sliding members in advance, so that when the outer tube is withdrawn, the jacking tube can automatically compensate for implant shortening and maintain accurate positioning.
2Ease of operation
If the outer tube is withdrawn to release the implant, then the implant is freed to expand, but the implant moves proximally with the outer tube causing positioning error
Solution Approach 1:
The jacking tube serves as an intermediary component between the outer tube and the implant. When the outer tube is withdrawn to release the implant, the jacking tube holds the implant in place and compensates for proximal movement, acting as a mediator that enables easy release while maintaining positioning accuracy.
3Length of moving object
If the implant is compressed into the catheter for delivery, then the implant can be delivered to the diseased area, but the implant cannot maintain its expanded shape during delivery
Solution Approach 1:
The implant is nested within the outer tube in a compressed state for delivery through the catheter to the diseased area. The jacking tube is nested within the outer tube with fixed position, configured to hold the implant. Upon release, the implant expands from its compressed nested state to its expanded functional shape, maintaining both deliverability and structural integrity.
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
Ensures accurate placement of the implant at the predetermined position, compensating for expansion-induced shortening and displacement, thereby ensuring effective treatment.
Implementation Method 1
the handle is threadedly matched with the first inner sliding member and the second inner sliding member for screw transmission, and configured to drive the first inner sliding member and the second inner sliding member to move linearly along an axis of the handle in opposite directions
Data Source
Figure 1~2
Figure 3~4
Figure 5a~5b
AI summary
An implant delivery system including a handle (100), a first inner sliding member (120), a second inner sliding member (130), an inner tube (500), an outer tube (200), and a jacking tube (300). The handle (100) is threadedly matched with the first inner sliding member (120) and the second inner sliding member (130) for screw transmission, and is used to drive the first inner sliding member (120) and the second inner sliding member (130) to move linearly in opposite directions along the axial direction of the handle (100) to drive the outer tube (200) and the jacking tube (300) to move in the opposite directions to realize the release of the implant (10) from the distal end to the proximal end. The handle (100), the first inner sliding member (120), and the second inner sliding member (130) simultaneously drive the outer tube (200) and the jacking tube (300) to move in opposite directions by means of screw feeding, and the implant (10) is pushed by the jacking tube (300) to a predetermined position to compensate for the displacement casued by the contraction of the implant (10) due to expansion, and to ensure accurate positioning of the implant (10).