Multi-Syringe Infusion Pump Pneumatic Sequencing
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Solution Overview
Problem
Current syringe-based injection pumps require administrators to manually switch between multiple syringes for sequential medication, saline, and anticoagulant injections, which is time-consuming and can lead to catheter clotting or contamination if not done promptly, increasing the risk of infection or requiring hospital visits.
Innovation Solution
A medical infusion pump that houses multiple syringes and uses pneumatic pistons of varying sizes to apply different forces, allowing solutions to be injected sequentially without manual intervention, utilizing a sequencer with poppets to ensure proper sequencing and prevent backflow, enabling sequential administration of solutions from multiple syringes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual syringe switching is used for sequential injections, then device complexity is reduced, but productivity decreases and reliability worsens due to risk of catheter clotting or contamination
Solution Approach 1:
Multiple syringe injection functions are merged into a single pump device. The pump houses multiple syringes (medication, saline, heparin) and automatically sequences their injection through integrated pneumatic control, eliminating the need for manual switching between separate injection devices.
Solution Approach 2:
The pump is designed as a multi-functional device that can administer different types of solutions (medication, flushing saline, anticoagulant heparin) through a single unit. The device universally handles various injection tasks that previously required separate manual operations.
2Loss of time
If manual syringe switching is performed, then ease of operation is maintained, but loss of time increases due to repeated disconnecting and connecting
Solution Approach 1:
Multiple syringes are pre-loaded into the pump device before the injection sequence begins. The pump is pre-configured with medication, saline, and heparin syringes in the correct positions, allowing the injection sequence to proceed automatically without time-consuming manual intervention during the injection process.
Solution Approach 2:
The injection process continues uninterrupted through automatic sequential activation of different syringes. The pump maintains continuous operation by seamlessly transitioning from medication injection to saline flushing to heparin administration without requiring manual disconnection or reconnection, eliminating idle time between injection stages.
3Reliability
If automated multi-syringe injection is implemented, then reliability improves by preventing catheter clotting, but device complexity increases due to pneumatic piston system
Solution Approach 1:
The pump uses a pneumatic control system where compressed air is distributed to different sized pistons to activate syringes in sequence. The pneumatic system provides reliable automated control of the injection sequence, ensuring timely administration of each solution type to maintain catheter patency and prevent clotting.
Solution Approach 2:
Different sized pistons are used for different syringes to create the necessary force variations for proper sequencing. The first piston (largest) provides sufficient force for the medication syringe, the second piston (medium) for the saline syringe, and the third piston (smallest) for the heparin syringe, with each piston's size optimized for its specific function.
4Productivity
If different sized pistons are used for sequencing, then productivity increases through automated sequential injection, but manufacturing precision requirements increase
Solution Approach 1:
The system uses variations in piston size as a key parameter to control the sequencing and force application for each syringe. By changing the physical dimension parameter (piston diameter) rather than using complex control logic, the system achieves automated sequencing with relatively simple manufacturing requirements.
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
Facilitates efficient and sequential administration of multiple solutions, reducing the risk of catheter clotting and contamination, allowing for automated operation that minimizes manual handling and ensures consistent delivery of medications, saline, and anticoagulants.
Implementation Method 1
the pump can employ pneumatic pistons of different sizes to apply a force on the plungers of the syringes. Due to the different sizes of the pistons, when an equal air pressure is applied to each piston, different forces will be applied to each plunger.
Data Source
AI summary
A medical infusion pump can be configured to sequentially inject solutions from multiple syringes. The medical infusion pump can be configured to automatically sequence the injection either by creating differential fluid pressures during injection or by employing a sequencer that creates differential forces on poppets which form seals between different input ports of the sequencer.