Vascular Implant Locking Structure for Stable Axial Delivery
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Solution Overview
Problem
Current vascular implant delivery systems face challenges in maintaining stable delivery due to unpredictable friction, leading to dislodgement of the implant during minimally invasive procedures, affecting surgical outcomes.
Innovation Solution
A vascular implant with a detachable engagement structure, comprising retention lugs and a delivery shaft with corresponding engagement members, allows for axial locking and unlocking, ensuring stable delivery by preventing dislodgement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If static friction is used to engage the vascular implant with the delivery shaft, then the implant can be delivered within the delivery sheath, but the implant is likely to dislodge due to uncontrollable friction magnitude
Solution Approach 1:
The patent replaces the static friction-based mechanical engagement system with a mechanical interlocking system consisting of engagement protrusions on the delivery shaft and corresponding engagement grooves on the vascular implant. This substitution provides deterministic mechanical retention that prevents implant dislodge ment while maintaining delivery operability.
Solution Approach 2:
The patent changes the engagement mechanism from friction-dependent (variable parameter) to geometric-interlock-dependent (fixed parameter). The engagement protrusions and grooves are designed with specific dimensions and tolerances that ensure reliable engagement regardless of friction variations, thus controlling the engagement stability parameter.
2Device complexity
If the vascular implant is contracted and sleeved over the delivery shaft without mechanical connection, then delivery is simplified, but axial stability is lost and dislodgement occurs
Solution Approach 1:
The patent replaces the simple friction-based mechanical system with a structured interlocking system featuring engagement protrusions and grooves. This substitution adds geometric complexity but provides deterministic axial stability through mechanical interlocking rather than relying on friction alone.
Solution Approach 2:
The engagement interface is segmented into discrete engagement protrusions and corresponding grooves distributed along the implant and delivery shaft. This segmentation provides multiple engagement points that collectively enhance axial stability while maintaining overall structural simplicity.
Data Source
Figure 1~2a
Figure 2b~3b
Figure 3c~4
AI summary
A vascular implant, a delivery device and a medical apparatus are disclosed. During delivery of the vascular implant, the vascular implant is maintained axially stationary relative to a delivery shaft (4), thus preventing the dislodgement of the vascular implant and making the delivery more stable. The vascular implant includes a first engagement structure, and the delivery device includes the delivery shaft (4) and a chamber. The delivery shaft (4) includes a second engagement structure configured for detachable retaining engagement with the first engagement structure. Both the first engagement structure and the delivery shaft (4) are configured to be received in the chamber. When the first engagement structure and the delivery shaft (4) are received in the chamber, the first engagement structure is confined by the chamber and thus remains in retaining engagement with the second engagement structure, thus axially locking the vascular implant to the delivery shaft (4). When the first engagement structure is removed from the chamber, it is no longer confined thereby and is thus detachable from the second engagement structure, thus axially unlocking the vascular implant from the delivery shaft (4).