Suture Needle Locking Structure to Prevent Premature Catheter Triggering
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Solution Overview
Problem
Interventional suture devices in transcatheter procedures for structural heart disease often fail to lock the suture needle, leading to premature triggering and potential damage to cardiac tissue due to misoperation.
Innovation Solution
A puncture locking device with a suture head containing a locking structure that includes an elastic locking assembly and an unlocking member, which restricts and unlocks the push-pull guiding member to control the suture needle's movement, ensuring secure locking and preventing premature penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a suture needle is introduced through a catheter for transcatheter interventional suturing, then the integrity of cardiac anatomy can be preserved with minimal trauma, but the suture needle may be prematurely triggered due to misoperation causing damage to heart tissue
Solution Approach 1:
The locking structure applies a preliminary locking action to the push-pull guiding member before the suture needle can be prematurely triggered. The elastic locking assembly automatically engages to restrict movement of the push-pull guiding member in the first direction, preventing premature penetration of the suture needle into the cardiac tissue before any harmful effect can occur.
Solution Approach 2:
The push-pull guiding member acts as an intermediary between the operator's manual input and the suture needle. The locking structure intervenes to control this intermediary component, restricting its movement to prevent direct transmission of unintended forces to the suture needle that could cause premature triggering and tissue damage.
2Reliability
If the suture needle is locked to prevent premature triggering, then safety is improved, but the device complexity increases due to the locking structure
Solution Approach 1:
The locking structure is nested within the suture head assembly, with the elastic locking assembly integrated into the existing catheter tip structure. The locking portion and elastic portion are contained within the suture head, utilizing the existing spatial arrangement rather than adding external complex mechanisms.
Solution Approach 2:
The elastic locking assembly is designed to automatically engage and lock the push-pull guiding member without requiring additional actuators or complex control systems. The elastic portion provides automatic resetting and locking through its inherent elastic properties, simplifying the overall device complexity while maintaining reliable locking function.
3Reliability
If the push-pull guiding member is restricted in movement, then the suture needle is locked securely, but the ease of operation decreases due to the locking mechanism
Solution Approach 1:
The locking structure transitions from a static locked state to a dynamic unlocked state when needed. The unlocking member can be actuated to overcome the elastic locking force, allowing controlled movement of the push-pull guiding member when the suture needle needs to be deliberately advanced, while maintaining automatic locking during normal operation.
Solution Approach 2:
The elastic locking assembly provides tactile feedback to the operator through the push-pull guiding member, allowing the operator to sense when the locking engagement is active. This feedback mechanism helps the operator understand the current state of the locking mechanism without requiring visual indicators or complex controls.
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 locking device stabilizes the suture needle, reducing the risk of cardiac tissue damage by securely locking the push-pull guiding member, enhancing accuracy and safety during transcatheter suturing.
Implementation Method 1
an elastic portion for providing a locking force to the locking portion
Implementation Method 2
the unlocking member moves within the suture head to counterbalance the force applied by the elastic portion to the locking portion
Data Source
AI summary
Disclosed in the present application are a puncture locking device and a suture apparatus. The suture apparatus includes a catheter, a handheld operation portion, and the puncture locking device. The puncture locking device includes a suture head, and a suture assembly and a locking structure are arranged inside the suture head. The suture assembly includes a suture needle and a push-pull guiding member, and the push-pull guiding member moves in an axial direction of the catheter so as to drive the suture needle to move. The locking structure includes an elastic locking assembly and an unlocking member, the elastic locking assembly includes a locking portion and an elastic portion. The handheld operation portion can control the movement of the push-pull guiding member and the unlocking member. By means of the locking structure, the suture needle is locked, such that pre-triggering of the suture needle caused by misoperation is avoided.