Concurrent TPN and Insulin Infusion via Segmented Lines
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Solution Overview
Problem
Current infusion systems for total parenteral nutrition (TPN) and insulin administration are complex and time-consuming, particularly in managing hyperglycemia, as they require manual modulation of insulin dosing and premixing of insulin with TPN solutions, increasing the risk of errors and complications.
Innovation Solution
A concurrent infusion system that uses a fluid administration set with separate lines for TPN and insulin solutions, a pump, and a flow controller to vary the ratio of TPN to insulin delivery based on glucose levels, allowing for simultaneous and controlled administration without premixing, and enabling ramping and tapering of infusion rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If insulin is premixed in the same IV bag with TPN solution, then the administration process is simplified, but the risk of errors and complications increases
Solution Approach 1:
The system divides the insulin and TPN solution delivery into separate independent lines (Line A for TPN, Line B for insulin) that converge at a common outlet. This segmentation allows each solution to be controlled separately through individual syringes and pumps, eliminating the need for premixing while maintaining administrative simplicity through integrated control.
2Adaptability or versatility
If manual modulation of insulin dosing is used, then flexibility in dosing is achieved, but the complexity and time consumption increase
Solution Approach 1:
The system incorporates a glucose sensor that continuously monitors blood glucose levels and provides feedback to the controller. The controller automatically adjusts the insulin dosing rate based on this feedback, maintaining dosing flexibility while eliminating manual modulation complexity. The controller can also adjust TPN delivery rate in response to glucose levels.
Solution Approach 2:
The system enables self-adjusting insulin and TPN delivery through automated control based on glucose sensor feedback. The controller automatically modulates the dosing rates without requiring manual intervention, reducing operational complexity while maintaining adaptability to changing glucose levels.
3Reliability
If separate lines for TPN and insulin are used, then the risk of errors is reduced, but the device complexity increases
Solution Approach 1:
The system merges the control of separate TPN and insulin delivery lines into a single integrated pump and controller unit. While the fluid paths remain separate for safety, the control functions are combined, allowing centralized management of both infusions through one interface, thereby reducing operational complexity despite maintaining separate delivery lines.
Solution Approach 2:
The pump system is designed to handle multiple functions: it can independently control TPN delivery through Line A, insulin delivery through Line B, and automatically adjust both based on glucose sensor feedback. This multi-functionality is integrated into a single device, reducing the need for multiple separate devices while maintaining the safety benefits of separate lines.
4Reliability
If TPN delivery is tapered to 50% to minimize hyperglycemia, then glycemic control is improved, but the treatment effectiveness is reduced
Solution Approach 1:
The glucose sensor provides continuous feedback on blood glucose levels, allowing the controller to dynamically adjust both TPN and insulin delivery rates. This eliminates the need for fixed 50% tapering, enabling full TPN delivery when appropriate while maintaining glycemic control through automated insulin adjustment and selective TPN modulation based on real-time glucose monitoring.
Data Source
Figure 1
Figure 1A
Figure 2~3A
AI summary
An infusion system to provide concurrent TPN/insulin infusion including: a fluid administration set having a primary line in fluid communication with the TPN source, a secondary line in fluid communication with the insulin source, and a common outlet line; a pump operable to removably receive the fluid administration set, the pump being operable to concurrently move the TPN solution through the primary line in response to a TPN solution flow rate signal and the insulin solution through the secondary line in response to an insulin solution flow rate signal; and a flow controller operable to provide the TPN solution flow rate signal and the insulin solution flow rate signal to the pump. The flow controller is further operable to vary the TPN solution flow rate signal and the insulin solution flow rate signal to vary a ratio of TPN solution to insulin solution provided to the common outlet line.