Stent Delivery Device Position Locking Mechanism
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Solution Overview
Problem
Existing stent delivery devices lack a reliable mechanism for safely and effectively locking the release position of stents during deployment, leading to potential stent displacement or release failure due to operator instability.
Innovation Solution
A delivery device equipped with a position locking device that includes a guide rod with first engagement structures, a tooth block with a second engagement structure, and an elastic component. The elastic component allows the engagement structures to lock the stent in place for controlled release and unlock it for gradual deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional stent release mechanism is used without elastic components, then the device structure is simpler, but the stent cannot be reliably locked at intermediate release positions and may displace during deployment
Solution Approach 1:
The elastic component serves as an intermediary element between the guide rod and the stent, providing a mechanical locking mechanism that enables reliable position holding without complex control systems. The elastic component mediates the interaction between the operator's manual control and the stent release process.
Solution Approach 2:
The elastic component introduces dynamic characteristics to the release mechanism, allowing it to transition between locked and unlocked states based on applied force. This dynamic behavior enables the stent to be held at intermediate positions during deployment while maintaining structural simplicity.
2Ease of operation
If the stent is released completely at once, then the deployment speed is faster, but the operator cannot control the release process and stent displacement may occur
Solution Approach 1:
The elastic component enables periodic or stepwise release action, allowing the operator to control the stent deployment in discrete stages. Each compression and release cycle of the elastic component corresponds to a controlled increment of stent release, providing manageable control without excessive time loss.
3Productivity
If multiple stents are implanted simultaneously, then the treatment efficiency is higher, but it becomes difficult to control and lock the release position of each stent individually
Solution Approach 1:
The release control mechanism is segmented into independent units, each with its own elastic component and engagement structures. This segmentation allows each stent to be controlled and locked independently while maintaining overall system simplicity, enabling simultaneous implantation of multiple stents without excessive complexity.
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
The delivery device enables safe and effective gradual release and locking of stents, preventing displacement and ensuring stable deployment, even during operator instability.
Implementation Method 1
an elastic component, wherein the elastic component allows the first engagement structure and the second engagement structure to be engaged when the elastic component is not compressed or partially compressed, and allows the first engagement structure and the second engagement structure to be separated when the elastic component is compressed
Data Source
Figure 1~3
Figure 4(a)~4(b)
Figure 4(c)~4(d)
AI summary
A delivery device (100) used for delivery of an implant comprises a holder (15), a guide rod (16), and a sliding handle (18). One end of the guide rod (16) is connected to the holder (15), and the other end of the guide rod (16) penetrates the sliding handle (18). Multiple first engagement structures (162) axially spaced apart from each other are disposed on an outer surface of the guide rod (16). The delivery device (100) also comprises a position locking device (17) disposed in the sliding handle (18). The position locking device (17) comprises a tooth block (172) and an elastic component (173). The tooth block (172) is sleeved on the guide rod (16) and is provided with a second engagement structure (1721). The elastic component (173) and the tooth block (172) cooperate to allow the first engagement structures (162) and the second engagement structure (1721) to engage with each other when the elastic component (173) is not compressed or partially compressed, allowing an implant to be in a release-locked state. When the elastic component (173) is compressed until the first engagement structures (162) are separated from the second engagement structure (1721), the implant is in a releasable state. By controlling the sliding position of the sliding handle (18) locked or unlocked with the delivery device (100), the implant can be gradually released or release-locked.