Adjustable Artificial Chordae Tendineae Fixing Assembly
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Solution Overview
Problem
Current percutaneous mitral repair techniques, such as MitraClip, cannot effectively implant and adjust the length of artificial chordae tendineae, leading to non-physiological repairs and increased surgical trauma, while existing implantation methods face challenges in adjusting the length of artificial chordae tendineae post-surgery due to cardiac volume changes.
Innovation Solution
An adjustable artificial chordae tendineae fixing assembly comprising an occlusion device with a penetrating passage and adjusting rod, featuring a locking assembly with friction plates and magnetic clamping jaws, allowing for repeated adjustment of the chordae tendineae length by controlling the friction plates and using magnetic attraction for secure clamping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If percutaneous approach is used to implant artificial chordae tendineae, then surgical trauma is reduced, but the ability to adjust chordae length after implantation is lost
Solution Approach 1:
The fixing assembly incorporates an adjustable structure that allows the chordae length to be modified after implantation. The assembly includes a movable component that can be repositioned along the chordae to change the effective length, enabling dynamic adaptation to cardiac volume changes and anatomical variations post-surgery.
Solution Approach 2:
The fixing assembly acts as an intermediary device between the chordae and the heart tissue. It provides a interface that allows both secure fixation and subsequent adjustment, mediating between the need for stable implantation and the requirement for post-implantation adaptability.
2Ease of manufacture
If artificial chordae tendineae are fixed using traditional methods, then implantation is simplified, but the chordae length cannot be adjusted after surgery
Solution Approach 1:
The fixing assembly transforms a static fixation device into a dynamic one with adjustment capabilities. The design allows for initial simple implantation followed by controlled adjustment through a mechanism that can be actuated externally or internally to modify the chordae length.
3Reliability
If open mitral valvuloplasty is performed, then effective treatment of mitral regurgitation is achieved, but surgical trauma and postoperative complications increase
Solution Approach 1:
The percutaneous fixing assembly serves as an intermediary that enables effective mitral valve repair without requiring open surgery. It delivers the chordae implantation function through a minimally invasive access route, maintaining treatment effectiveness while avoiding the trauma associated with traditional open approaches.
Solution Approach 2:
The invention replaces the mechanical open surgical system with a percutaneous delivery system. The fixing assembly is delivered through a catheter-based approach, substituting the need for large incisions and direct surgical manipulation with a less invasive mechanical delivery mechanism.
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
Enables safe, minimally invasive fixation and repeated adjustment of artificial chordae tendineae length, reducing surgical trauma and addressing length changes post-surgery, thereby improving the efficacy of mitral valve repair procedures.
Implementation Method 1
A locking assembly and a plurality of friction plates on the inner side of the adjusting device extend inside the opening of the penetrating passage. The plurality of friction plates are connected to the valve, and the number of the plurality of friction plates is at least two. The plurality of friction plates are controlled to be opened or closed by rotating the valve, so as to control the penetrating passage to be opened or closed.
Implementation Method 2
The occlusion device is an elastic mesh structure capable of producing an elastic deformation.
Implementation Method 3
Two clamping jaws are arranged at the head of the adjusting rod, and the two clamping jaws are connected to a handle at the tail of the adjusting rod by a spring. The two clamping jaws are controlled to be opened and closed by pressing the handle at the tail of the adjusting rod.
Implementation Method 4
The two clamping jaws can be clamped on the protruding portion of the adjusting device to be connected to the occlusion device.
Data Source
AI summary
An adjustable artificial chordae tendineae fixing assembly includes an occlusion device and an adjusting rod which are both a hollow structure allowing the artificial chordae tendineae to pass through. The occlusion device is configured to be clamped on the interventricular septum. The occlusion device is provided with a switch adjusting device which controls the artificial chordae tendineae to move and to be fixed. The adjusting rod is connected to the occlusion device, and is capable of repeatedly adjusting the switch adjusting device on the occlusion device. The artificial chordae tendineae fixing assembly can fix the artificial chordae tendineae on the interventricular septum, and can also overcome the problem of unsuitable length of the artificial chordae tendineae in most of patients after the procedure due to cardiac changes. The artificial chordae tendineae is retained at the skin puncture point for a short time.