Vascular Prosthesis Delivery Device with Rotating Handle
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Solution Overview
Problem
Current endovascular delivery devices for treating aortic aneurysms lack precise control in graft placement, necessitating the development of improved delivery devices and methods for more accurate implantation of vascular prostheses.
Innovation Solution
A delivery device comprising a guidewire catheter with a handle body, push rod, and locking mechanism, allowing for controlled longitudinal movement and rotation of the delivery catheter and push rod, enabling precise advancement and retraction of a vascular prosthesis during implantation, with an actuator for independent movement and a locking mechanism for secure engagement and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current endovascular delivery devices are used, then the procedure can be performed, but precise control in graft placement is lacking
Solution Approach 1:
The delivery device incorporates a rotatable handle that translates rotational motion into longitudinal movement of the delivery catheter through a rack and pinion mechanism. This dynamic conversion allows the operator to precisely control the advancement of the graft by rotating the handle, with each rotation incrementally moving the catheter forward, thereby achieving precise placement control while maintaining ease of operation.
Solution Approach 2:
The device includes visual indicators on the handle that provide feedback to the operator about the position and movement of the delivery catheter. The handle features markings that indicate the number of rotations and corresponding displacement of the catheter, allowing the operator to monitor and control the placement precision accurately without losing oversight of the advancement process.
2Manufacturing precision
If the delivery catheter is advanced to precise positioning, then graft placement accuracy improves, but device complexity increases
Solution Approach 1:
The device employs a push rod as an intermediary element that transmits force from the handle mechanism to the delivery catheter. The rack and pinion mechanism converts rotational motion at the handle into linear motion of the push rod, which then advances the delivery catheter. This intermediary mechanical transmission system achieves precise positioning control while keeping the overall device structure manageable and not excessively complex.
3Ease of operation
If the proximal handle is selectively fixed to the push rod, then controlled movement is achieved, but the locking mechanism adds complexity
Solution Approach 1:
The locking mechanism is designed to automatically engage and disengage based on the position and movement of the handle relative to the push rod. As the handle rotates and moves longitudinally, the locking components automatically interact with corresponding features on the push rod to secure or release the connection. This self-acting locking mechanism provides controlled movement without requiring additional manual operation or complex external locking systems.
Data Source
AI summary
Methods for delivering a vascular prosthesis to a treatment site of a subject include advancing the vascular prosthesis, rotating a proximal handle in a first direction about a handle body, shifting the position of a first locking component securing the proximal handle to the push rod from a first position to a second position, rotating the proximal handle in a second direction, releasing the proximal end of the prosthesis from the apex delivery device, shifting the second locking component to disengage the push rod from the handle body; and withdrawing the push rod and the guidewire catheter from within the prosthesis, thereby delivering the vascular prosthesis to the treatment site.