Blood Pump Reversal for Complete Circuit Flushing
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Solution Overview
Problem
Existing methods for removing blood from extracorporeal blood circuits after treatment sessions are inefficient, leading to contamination risks and prolonged disposal processes, with issues like blood clots forming in predilution valves and inefficient blood return due to limited delivery rates.
Innovation Solution
A method involving a blood pump reversing direction to connect arterial and venous line sections, with a second conveying device introducing a substituate fluid, dynamically controlling delivery rates to ensure complete blood removal and prevent clot transport, using formulas to adjust delivery rates based on pressure and flow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blood pump continues to convey blood in the first conveying direction after treatment, then blood removal is incomplete and contamination risks increase, but reversing the pump direction may cause blood clots to form in the predilution valve
Solution Approach 1:
The blood pump reverses its conveying direction from the first direction (arterial to venous) to the second direction (venous to arterial) to remove residual blood from the extracorporeal circuit. This inversion enables complete blood removal while the substituate fluid prevents clot formation in the predilution valve by flushing it in the opposite direction.
Solution Approach 2:
A substituate fluid is introduced as an intermediary substance to prevent blood clot formation in the predilution valve during the reversal process. The substituate fluid acts as a mediator that allows the blood pump to reverse direction without causing harmful clotting, enabling safe and complete blood removal.
2Productivity
If the blood pump delivers at high speed to remove blood quickly, then productivity increases, but pressure control becomes difficult and blood clots may be transported to the venous line section
Solution Approach 1:
The blood pump's delivery rate is dynamically adjusted during the reversal process. The control device continuously monitors pressure and flow conditions, modifying the pump's delivery rate in real-time to maintain optimal pressure control while preventing blood clots from being transported to the venous line section, thus balancing speed and safety.
Solution Approach 2:
A control device monitors pressure and flow parameters during blood removal and provides feedback to adjust the blood pump's delivery rate. This feedback mechanism ensures pressure control stability and prevents clot transport while maintaining efficient blood removal, resolving the contradiction between speed and reliability.
3Productivity
If the arterial line section is disconnected from the venous line section, then blood can be removed efficiently, but the device complexity increases and operation becomes more complicated
Solution Approach 1:
The arterial and venous line sections are designed with universal connection capabilities, allowing the arterial line section to be connected to the venous line section during blood removal. This multi-functional connection design enables efficient blood removal without increasing device complexity, as the same connection interfaces serve multiple purposes during different operational phases.
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
This method effectively removes blood from extracorporeal circuits, reducing contamination risks, preventing clot transport, and optimizing blood return efficiency, allowing for quicker and more thorough device flushing.
Implementation Method 1
pumping the fluid still present in the extracorporeal blood circulation after the blood treatment session has ended by means of a blood pump
Implementation Method 2
at least a second conveying device, in particular a substituate pump, for introducing a second fluid, in particular a substituate liquid, into the interior of the line of the extracorporeal blood circuit
Data Source
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Figure 2
AI summary
The invention relates to a method for withdrawing blood from an extracorporeal blood circuit (2000) and/or from a functional apparatus (1000), which each can be or are connected to a blood treatment device for the purpose of a blood treatment of a patient, after the blood treatment session has ended, wherein the blood treatment device has or is connected to: at least one extracorporeal blood circuit (2000) having a line interior, wherein the extracorporeal blood circuit (2000) has at least one arterial line segment (1) and at least one venous line segment (3); at least one one blood pump (4000) for conveying blood within the line interior; and at least one second conveying apparatus (5000), wherein the method comprises the step of operating the blood pump (4000) in a second conveying direction that is opposite the first conveying direction that is typical during the blood treatment, wherein a first segment of the arterial line segment (1) is or becomes connected to a second segment of the venous line segment (3) of the extracorporeal blood circuit (2000). The invention further relates to corresponding devices.