Interventional Motor Assembly With Reflux Perfusion Isolation
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Solution Overview
Problem
Existing ventricular assist devices generate tiny particles due to motor assembly bearings that enter the patient's vessels with perfusion solution, posing harm to the human body.
Innovation Solution
A motor assembly design with a perfusion catheter and reflux catheter system that isolates and recycles perfusion solution, flushing bearings to prevent particle entry and reduce temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor assembly rotates at high speed to pump blood, then the blood-pumping efficiency is improved, but the bearing generates tiny particles that flow into the patient's vessels with the perfusion solution, causing harm to the human body
Solution Approach 1:
The motor assembly is divided into separate functional zones: a first cavity for the motor components (stator, rotor, bearing) and a second cavity for the perfusion solution flow path. This segmentation isolates the particle-generating bearing from the perfusion solution, allowing high-speed rotation to continue while preventing particle contamination of the blood pump fluid.
Solution Approach 2:
The bearing is extracted from the direct perfusion solution flow path and placed within the sealed first cavity. The perfusion solution flows through the second cavity, which is spatially separated from the bearing location. This extraction removes the source of particles from the harmful flow path while maintaining the bearing's essential function of supporting high-speed rotor rotation.
2Temperature
If the perfusion solution flows through the bearing to cool it, then the motor temperature is controlled, but the particles generated by the bearing enter the patient's vessels with the perfusion solution
Solution Approach 1:
The cooling function is separated from the perfusion solution path by creating distinct cavities: the first cavity contains the bearing and is sealed off from the patient's body, while the second cavity handles the perfusion solution flow. The bearing can be cooled through the perfusion solution in the first cavity without contaminating the second cavity's clean fluid path.
Solution Approach 2:
The first cavity acts as an intermediary chamber that allows thermal exchange between the bearing and perfusion solution without direct contamination. The sealed first cavity mediates the cooling function while preventing particle transfer to the perfusion solution that flows in the second cavity.
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
Reduces the total amount of particles entering the patient's body, enhances product safety, and maintains motor temperature stability by recycling perfusion solution.
Implementation Method 1
External perfusion solution flows through the perfusion catheter, the bearing, and the reflux catheter in sequence in such a manner that the external perfusion solution flows out of the first cavity
Data Source
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AI summary
The present application discloses a motor assembly of an active interventional medical instrument. The motor assembly comprises a motor main body, a perfusion tube, and a return tube. The motor main body comprises a stator assembly, a rotor assembly, and a housing. The stator assembly and the rotor assembly are arranged within the housing. The rotor assembly is sleeved with the stator assembly. The gap between the rotor assembly and the stator assembly forms a first cavity. The rotor assembly comprises a rotating shaft and a bearing. The rotating shaft extends in a first direction, and the rotating shaft is sleeved with the bearing and rotates, by means of the bearing, relative to the housing.