Blood Pump Drive Shaft Structure for Low-Wear Startup
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Solution Overview
Problem
Conventional intravascular blood pumps experience severe wear and startup difficulties due to the rotating shaft, affecting their functionality.
Innovation Solution
A driving device with a rotating shaft featuring a raised part that is received in a receiving cavity with specific cavity walls, where an attractive force between a stator and rotor ensures the raised part abuts against the cavity walls, reducing wear and facilitating easy startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional rotating shaft is used in the blood pump, then the blood pump can be operated, but the rotating shaft experiences severe wear and startup difficulties
Solution Approach 1:
The patent extracts the harmful friction and wear effects by eliminating direct contact between the rotating shaft and the housing. The rotating shaft is designed to rotate freely within the housing cavity without physical contact, removing the source of wear and startup difficulties while maintaining the blood pump's operational reliability
Solution Approach 2:
The patent replaces the traditional mechanical contact-based rotation support system with a non-contact rotational mechanism. Instead of using bearings or friction-based support, the rotating shaft utilizes a non-contact rotational design where the shaft rotates within a cavity without physical contact, eliminating wear and reducing startup resistance
2Reliability
If the raised part abuts against the cavity wall, then wear is reduced, but friction and pressure must be minimized for easy startup
Solution Approach 1:
The patent introduces an intermediary fluid medium (blood or lubricant) between the raised part of the rotating shaft and the cavity wall. This intermediary layer enables the raised part to abut against the cavity wall for stability and wear protection while minimizing direct friction through fluid lubrication, facilitating easy startup
Solution Approach 2:
The patent changes the physical state and properties of the interface between the rotating shaft and housing by utilizing fluid pressure and lubrication. The fluid medium transforms the dry friction contact into a lubricated contact, reducing friction forces while maintaining the beneficial abutment relationship for wear protection
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 design reduces wear on the rotating shaft by minimizing friction and pressure, enhancing the blood pump's reliability and ease of operation.
Implementation Method 1
a stator configured to drive the rotor to rotate. An attractive force is generated between the stator and the rotor, and the attractive force enables the first surface to abut against the first cavity wall
Data Source
AI summary
Provided are a blood pump and a driving device. The driving device comprises a housing assembly, a rotating shaft), a rotor, and a stator. An accommodating cavity of the housing assembly has a first cavity wall and a second cavity wall. A protruding portion of the rotating shaft has a first surface and a second surface. The first surface faces the first cavity wall. The second surface faces the second cavity wall. The area of the first surface is greater than the area of the second surface. The area of the first surface is less than or equal to the area of the first cavity wall. There is an attraction force between the stator and the rotor, and the attraction force enables the first surface to abut against the first cavity wall.