Rotary Control Handle for Compact Implant Delivery
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Solution Overview
Problem
Conventional implant delivery devices lack control over bending speed and suffer from structural incompactness due to the design of control wires and handles, which is a challenge in precise and minimally invasive procedures like transcatheter valve replacement.
Innovation Solution
A control handle with a rotary part that is rotatably coupled to a basic part, allowing the control wire to be wound on the rotary part, enabling adjustable bending speed and compactness, featuring a manipulation portion, winding portion, and self-locking mechanisms for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a slider is used to drive the control wire in conventional handles, then the control wire can be pulled to bend the catheter, but the handle becomes large in size and structural compactness deteriorates
Solution Approach 1:
The patent replaces the static slider mechanism with a dynamic rotary mechanism. The control wire is wound around a rotary part that can rotate to pull the wire, enabling continuous adjustment of catheter bending without requiring a large linear travel space. This dynamic rotational motion achieves the same functional effect as the slider while occupying significantly less volume.
Solution Approach 2:
The invention transitions from linear motion (slider moving along an axis) to rotational motion ( rotary part spinning around an axis). By changing the dimension of motion from one-dimensional linear displacement to one-dimensional rotational displacement, the mechanism achieves compactness while maintaining full control capability over the control wire.
2Ease of operation
If a slider mechanism is used to control the control wire, then bending control is achieved, but bending speed cannot be controlled
Solution Approach 1:
The rotary mechanism allows for variable rotational speeds, enabling dynamic control of wire pulling speed. By rotating the rotary part at different speeds, the operator can control how quickly the control wire is pulled, thereby controlling the bending speed of the catheter. This dynamic speed control is not achievable with a simple slider mechanism.
Solution Approach 2:
The invention enables control of the operational parameter (bending speed) by changing the rotational speed parameter of the rotary part. Different rotational speeds produce different wire pulling rates, which directly control the bending speed of the catheter. This parameter control capability is inherent in the rotary mechanism but absent in the slider design.
3Ease of operation
If the control wire is pulled through a long handle structure, then bending control is achieved, but the wire is susceptible to fatigue and breakage
Solution Approach 1:
The rotary mechanism creates a compact wire path where the control wire is wound around the rotary part in a controlled manner. This reduces the linear length of wire exposed to stress and minimizes sharp bends in the wire path. The shortened and optimized wire route decreases cumulative stress on the wire, reducing fatigue and breakage risk.
Data Source
AI summary
A control handle (1), a control wire (21) and an implant (3) delivery device are disclosed. The control handle (1) includes a basic part (11) and a rotary part (12). The basic part (11) is configured to connect a flexible catheter (22) in a catheter assembly (2) and has an axial direction that is as same as an axial direction of the flexible catheter (22). The rotary part (12) is rotatably coupled to the basic part (11) along a radial direction of the basic part (11), and an rotational axis of the rotary part (12) is not coplanar with an axis of the basic part (11). The rotary part (12) is fixedly coupled to a proximal end of the control wire (21) and is configured to rotate to cause the control wire (21) to be wound thereon. The rotational axis of the rotary part (12) is not coplanar with the axis of the basic part (11), as a result of rotation of the rotary part (12), the control wire (21) is wound thereon, enabling bending control. In this way, the control handle (1) is allowed to have a reduced length, leading to increased structural compactness. Further, the rotary part (12) on which the control wire (21) is wound can be resized to enable adjustment of transmission ratio and hence bending speed.