Liquid Injector Fixed Quantity Charging Unit
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Solution Overview
Problem
Existing liquid injectors for pain management in patients after surgery face challenges in consistently delivering a fixed quantity of analgesic liquid due to low injection speed and variable recharging times, making it difficult to accurately administer narcotic analgesics.
Innovation Solution
A liquid injector design incorporating a fixed quantity charging unit, brake button unit, and continuous injection unit that automatically charges and continuously supplies a fixed quantity of liquid, featuring a transparent cylinder for visual liquid monitoring and a resilient tube for controlled release, ensuring safe and consistent delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the liquid injector uses a thin catheter with small diameter for injection, then the injection precision and patient safety are improved, but the injection speed and recharging efficiency deteriorate
Solution Approach 1:
The device segments the injection function into two parts: a thin catheter for precise patient injection and a larger reservoir chamber for liquid storage and charging. This allows the injection pathway to remain thin and precise while the charging mechanism can handle larger volumes efficiently.
Solution Approach 2:
The piston acts as an intermediary mechanism between the liquid reservoir and the catheter. It transfers liquid from the larger reservoir to the thin catheter in controlled amounts, enabling both efficient charging and precise injection without directly connecting the large reservoir to the thin catheter.
2Duration of action of stationary object
If the liquid injector charges liquid at an intermediate point during continuous supply, then the continuous analgesia function is maintained, but the recharging time increases and liquid quantity control deteriorates
Solution Approach 1:
The device performs preliminary charging of a fixed quantity of liquid into the reservoir chamber before continuous supply begins. This pre-charging action ensures that the continuous injection can proceed without interruption for recharging, reducing overall recharging time and maintaining continuous analgesia.
Solution Approach 2:
The piston mechanism automatically transfers liquid from the reservoir to the catheter based on the charged quantity, without requiring manual intervention during the injection process. This self-service mechanism maintains continuous supply while minimizing the time lost to manual recharging operations.
3Reliability
If the liquid injector allows additional injection when patient needs pain relief, then the pain management effectiveness is improved, but the total liquid quantity control and safety deteriorate
Solution Approach 1:
The device incorporates a feedback mechanism where the piston position and charged liquid quantity are monitored. This feedback system tracks the total amount of liquid injected, allowing the device to maintain safety controls even when additional injections are administered for pain management needs.
Solution Approach 2:
The device allows dynamic adjustment of injection parameters such as the volume of additional liquid that can be injected. By changing these parameters based on patient needs while maintaining overall quantity limits, the device balances pain management effectiveness with safety controls on total liquid administration.
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
The design allows for safe and efficient continuous injection of a fixed quantity of liquid, ensuring accurate administration of analgesics, reducing recharging time and variability, and enhancing patient pain management.
Implementation Method 1
a resilient tube (62) which surrounds the injection hole (60a) and absorbs the liquid discharged from the fixed quantity charging unit (43)
Data Source
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AI summary
A liquid injector that additionally supplies charged liquid to a patient is provided. The liquid injector includes that continuously supplies a fixed quantity of liquid to a patient only when the fixed quantity of liquid has been charged.