Motor-Driven Tissue-Removing Catheter with Nested Design
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Solution Overview
Problem
Current tissue-removing catheters face challenges in efficiently removing occlusive tissue from body lumens, particularly in maintaining patency of blood vessels and other body lumens, due to limitations in design and functionality that affect their ability to effectively abrade or cut tissue without causing damage to the vessel walls.
Innovation Solution
A rotational tissue-removing catheter with a motor-driven tissue-removing element that extends around the perimeter of the motor, allowing for selective rotation and tissue removal within the body lumen, featuring a compact design with a guidewire lumen for easy navigation and a rapid exchange system for single-operator procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a motor is placed in the distal end portion of the catheter, then the tissue-removing element can be selectively rotated for effective tissue removal, but the catheter structure becomes more complex and the motor may interfere with guidewire navigation
Solution Approach 1:
The motor is received within a cavity in the tissue-removing element, nesting the motor inside the tissue-removing element itself. This eliminates the need for a separate motor housing in the catheter body, reduces overall device complexity, and prevents interference with guidewire navigation while maintaining the ability to selectively rotate the tissue-removing element for effective tissue removal
2Volume of moving object
If the tissue-removing element extends around the perimeter of the motor, then the design becomes more compact, but the motor cavity requires precise positioning to accommodate the motor
Solution Approach 1:
The tissue-removing element is designed with a cavity specifically configured to receive the motor, with the cavity positioned to allow the tissue-removing element to extend around the perimeter of the motor. This localized structural adaptation enables compact positioning while providing clearances and features that facilitate assembly, reducing the need for extremely high manufacturing precision
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 catheter effectively removes occlusive tissue while minimizing friction and optimizing guidewire compatibility, enhancing the ability to maintain patency of body lumens and allowing for efficient treatment of conditions like chronic total occlusion and stenoses with reduced risk of vessel damage.
Implementation Method 1
the tissue-removing element being configured to remove the tissue as the tissue-removing element is rotated by the motor within the body lumen
Data Source
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Figure 2
AI summary
A tissue-removing catheter includes an elongate body having proximal and distal end portions and a motor fixed to the distal end portion of the elongate body. A tissue-removing element is mounted on the motor to be driven in rotation by the motor about a drive axis. In some embodiments, the tissue-removing element includes a receptacle that receives the motor therein. The tissue-removing element can include a distal tip that extends distally beyond the motor to define the distal end of the catheter. The motor can be controlled using an actuator located outside the body. And in some embodiments, use of the catheter involves adjusting the rotational speed of the tissue-removing element using the actuator.