Rotating Thrombus Crushing Device with Segmented Wire Rods
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Solution Overview
Problem
Existing medical devices for removing thrombi from body lumens often require medication, which can cause side effects like bleeding, or rely on mechanical wire rods that are prone to deformation and inconsistent in their ability to break thrombi due to twisting.
Innovation Solution
A medical device with a rotatable shaft and a crushing unit featuring bendable wire rods, where the sliding unit is fixed to the shaft to prevent twisting and maintain a consistent range for effective thrombus crushing, allowing for mechanical breakdown of thrombi without medication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bent wire rod is used as a crushing member that is not fixed at the second end portion, then the wire rod can be deformed into a linear shape to reach the target position, but the wire rod becomes twisted and deformed when the shaft portion is rotated, causing the crushing range to change continually
Solution Approach 1:
The wire rod is divided into two separate portions: a first end portion that is fixed to the shaft for stable rotation, and a second end portion that remains free to bend and adapt to the target position. This segmentation allows each portion to fulfill its specific function without interfering with the other.
Solution Approach 2:
The bending capability is extracted from the fixed portion and assigned to the free second end portion of the wire rod. This allows the crushing member to maintain stability at the fixed end while possessing adaptability at the free end, resolving the contradiction between stability and versatility.
2Reliability
If a medical treatment method of injecting a medicine for removing a thrombus is used, then the thrombus can be dissolved, but side effects such as bleeding occur
Solution Approach 1:
The patent replaces the chemical method (medicine injection) with a mechanical method (rotating wire rod crushing). The wire rod physically breaks down the thrombus through mechanical crushing forces, eliminating the need for thrombolytic agents and their associated bleeding risks.
Solution Approach 2:
The patent converts the harmful side effect of chemical thrombus removal (bleeding) into a beneficial mechanical approach. By using mechanical crushing instead of chemical dissolution, the treatment achieves thrombus removal effectiveness while avoiding the harmful bleeding side effect.
Data Source
AI summary
A medical device for crushing an object in a body lumen, the medical device including: an elongated shaft portion rotatably driven; a crushing unit provided with bendable wire rods and rotatable together with the shaft portion; and a sliding unit fixed to each of end portion of the wire rods on at least one of a distal side of and a proximal side of the wire rods and is interlocked with the shaft portion so as to be slidable in an axial direction of the shaft portion. The shaft portion is provided with contact portions that come into contact with the sliding unit during rotation and limit relative rotation of the shaft portion and the sliding unit. After the sliding unit is attached to the contact portions, the sliding unit rotates in the same direction as the shaft portion along with the rotation of the shaft portion.