Intravascular Blood Pump Outflow Hose for Shift Tolerance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fixed-diameter intravascular blood pumps are sensitive to longitudinal shifts, which can lead to inefficient operation and hemolysis due to the intake and output ports being displaced to the same side of a heart valve, and lengthening the intake cannula to mitigate this issue increases hydraulic loss.
Innovation Solution
Incorporating an outflow hose that longitudinally separates the discharge port from the pump output port, maintaining the intake and output ports on opposite sides of the heart valve without extending the intake cannula, and optionally using a radially collapsible or expandable design to facilitate insertion and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intake cannula is lengthened to increase spacing between intake and output ports, then the pump becomes more tolerant to longitudinal shifts, but hydraulic loss increases
Solution Approach 1:
The patent introduces an outflow hose that extends in the longitudinal direction to create spatial separation between the output port and discharge port. This adds a longitudinal dimension to the port spacing, achieving the required distance without lengthening the intake cannula in the radial direction, thereby avoiding increased hydraulic loss.
2Ease of manufacture
If fixed-diameter pump design is used, then manufacturing is simpler, but the pump is more sensitive to longitudinal shifts causing hemolysis
Solution Approach 1:
The outflow hose provides additional longitudinal spacing between the output port and discharge port, creating a buffer zone that prevents both ports from being displaced to the same side of the heart valve during longitudinal shifts. This maintains the fixed-diameter pump's manufacturing simplicity while reducing hemolysis risk.
3Power
If expandable housing design is used, then the pump can operate at lower speeds with external motors, but device complexity increases
Solution Approach 1:
The outflow hose extends the discharge port longitudinally away from the pump housing, allowing the use of fixed-diameter pumps with external motors. This spatial arrangement enables motor placement outside the pump body while maintaining adequate port separation, thereby reducing pump structure complexity compared to expandable designs.
Data Source
AI summary
An intravascular blood pump includes a pump housing having an input port and an output port. A relatively short intake cannula may draw blood in through an intake port and deliver the blood to the input port of the pump housing. The intake cannula is relatively short, to prevent excess hydraulic loss. An outflow hose is connected to the output port of the pump housing, so as to convey blood exiting the output port through the outflow hose in a downstream direction to a discharge port, e.g. into an aorta or other blood vessel. Despite the short intake cannula, the outflow hose longitudinally separates the intake port from the discharge port sufficiently so the intake port and the discharge port remain on opposite sides of a heart valve, despite inadvertent longitudinal shifts of the intravascular heart pump.