Constant Force Syringe Pump with Adjustable Driver
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Solution Overview
Problem
Existing constant force syringe pumps are not adaptable to syringes of different sizes, leading to inappropriate force application and potential safety issues during subcutaneous Ig therapy.
Innovation Solution
A mechanical constant force syringe pump assembly that accommodates syringes of different sizes by using an adjustable driver with a spring and adjustable braker to provide a constant force, allowing for the proper dispensation of liquid medicant regardless of syringe size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a constant force syringe pump is designed for a specific syringe size, then it can provide the correct constant force for that syringe size, but it cannot accommodate syringes of different sizes
Solution Approach 1:
The pump system employs a spring-based adjustable driver that can dynamically adjust the constant force applied to the plunger. The spring constant and pre-compression can be modified to accommodate different syringe sizes, allowing the same pump device to work with various syringe volumes (e.g., 5ml, 10ml, 50ml) by simply changing the spring configuration rather than redesigning the entire pump system.
Solution Approach 2:
The invention changes the force application parameter by using an adjustable driver with variable spring constants or adjustable pre-compression settings. This allows the pump to adapt the constant force magnitude according to the syringe size, where smaller syringes require less force and larger syringes require more force to maintain appropriate flow rates.
2Object-affected harmful factors
If a constant force is applied to a small syringe in a pump designed for large syringes, then the pump structure can accommodate the syringe, but the applied force is too great and unsafe
Solution Approach 1:
The adjustable driver allows modification of the force parameter through spring selection or adjustment mechanisms. For small syringes, a weaker spring or reduced pre-compression is used to deliver appropriate constant force, preventing excessive force application while maintaining the constant force delivery mechanism.
Solution Approach 2:
The system transitions from a fixed force application to a dynamic, adjustable force application. The spring-based driver can be configured to match the syringe size, ensuring that the constant force remains within safe limits for each specific syringe volume being used.
3Productivity
If the force is increased to accommodate small syringes in a large syringe pump, then small syringes can be used, but the flow rate cannot be controlled properly
Solution Approach 1:
The invention directly links the force parameter to the flow rate outcome by providing adjustable constant force through the spring mechanism. By tuning the spring constant and pre-compression, the system achieves the precise force magnitude needed to maintain the prescribed flow rate for each syringe size, ensuring accurate productivity control.
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
Ensures safe and consistent dispensation of liquid medicant at the prescribed flow rate, regardless of syringe size, thereby enhancing patient safety and convenience.
Implementation Method 1
an adjustable driver structured and arranged to provide a constant force between the pusher and the puller, the adjustable driver provided by a spring connected between the pusher and the puller
Implementation Method 2
an adjustable brake structured and arranged to provide an adjustable braking force to reduce the first force
Data Source
AI summary
Provided is a constant force pump accommodating syringes of different sizes. The system is provided by an enclosure having a base having a proximal end and a distal end, the base structured and arranged to receive a syringe having a plunger slidably disposed within a chamber having an outlet, the chamber having a length and a diameter, the plunger having a head; a pusher in sliding engagement with the base, the pusher structured and arranged to contact the head of the plunger; a puller in sliding engagement with the base; a sizer structured and arranged to determine the size of the chamber; an adjustable driver structured and arranged to provide a constant force between the pusher and the puller, the constant force adjustably selected by the size of the chamber. An associated method of use is provided as well.