Detachment Mechanism for Delivery Catheter Relocation
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Solution Overview
Problem
Current delivery catheters for minimally invasive interventional surgery face challenges due to dimensional limitations of blood vessels, leading to suboptimal coupling designs that result in deformation or breakage, and lack of relocation capability after detachment, affecting delivery accuracy.
Innovation Solution
A detachment mechanism comprising a detacher and two control members, where the control members are detachably engaged, allowing locking and unlocking to facilitate controlled detachment and relocation of the detacher after it is pushed out of a confined space, enabling precise delivery and retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a miniature detachment mechanism is used in confined space, then the delivery catheter can be delivered through blood vessels, but the mechanism cannot be relocated after detachment
Solution Approach 1:
The detachment mechanism is divided into separate controllable components (first control member and second control member) that can be independently manipulated. The first control member can be removed from the through hole to unlock and detach the second control member from the detacher, enabling selective relocation of components after initial delivery through confined spaces.
Solution Approach 2:
The detachment mechanism transitions from a static locked state to a dynamic controllable state. The through hole design with controlled access allows the mechanism to shift between locked (when control members are inserted) and unlocked (when control members are removed) states, enabling adaptability after delivery.
2Adaptability or versatility
If multi-layer delivery catheters are used to meet dimensional limitations, then delivery through blood vessels is enabled, but larger pushing forces are required and fabrication becomes more difficult
Solution Approach 1:
The delivery catheter is segmented into multiple independent layers with through holes, allowing each layer to be fabricated separately and then assembled. This segmentation reduces the complexity of fabricating single complex structures while enabling the necessary multi-layer configuration for delivering through blood vessels.
Solution Approach 2:
The control members act as intermediaries that simplify the coupling between layers. Instead of requiring complex direct couplings that demand large pushing forces, the control members provide a simplified interface that eases both fabrication and operation of the multi-layer structure.
3Adaptability or versatility
If control members are detachably engaged, then relocation is enabled, but the coupling design becomes more complex
Solution Approach 1:
The coupling mechanism is segmented into simple insertable control members that can be independently added or removed from the detacher. This segmentation creates a simple yet effective coupling design where relocation is enabled by simply removing the control members from the through hole, avoiding complex coupling mechanisms.
Data Source
AI summary
A detachment mechanism and a delivery catheter are used to enable delivery and detachment of an implant (1). The detachment mechanism includes a detacher (10), a first control member (20) and a second control member (30). A distal end of the detacher (10) is configured for engagement of the implant (1) therewith. The detacher (10) defines a through hole (11). The first control member (20) and the second control member (30) are detachably engaged with or directly joined to each other. When distal ends of the first control member (20) and the second control member (30) are inserted through the through hole (11) and engaged with each other, the first control member (20) and the second control member (30) are locked against the detacher (10). When the first control member (20) is pulled and removed from the through hole (11), the first control member (20) and the second control member (30) are detached from the detacher (10). In this way, relocation of the detacher (10) is allowed, resulting in improved delivery accuracy.