Constant Force Syringe Pump with Adjustable Driver
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current constant pressure syringe pumps are not adaptable to different syringe sizes, leading to inconsistent force application and potential safety issues during subcutaneous Ig therapy, as they are designed for specific syringe sizes and require manual transfer of medication, which can result in contamination and stress.
Innovation Solution
A mechanical constant force syringe pump assembly that accommodates syringes of various sizes by using a base, pusher, puller, sizer, and adjustable driver to apply a specific constant force based on the syringe's size, ensuring proper force application and preventing over- or under-administration of medication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant pressure pump is designed for a specific syringe size, then the force application is consistent for that size, but the pump cannot accommodate syringes of different sizes
Solution Approach 1:
The pump system dynamically adjusts the spring force characteristics based on syringe size. Different springs with different force constants (k values) are selected and engaged depending on the syringe volume, allowing the system to optimize force application for each specific syringe size while maintaining reliability.
Solution Approach 2:
The system changes the physical parameters of the spring mechanism by selecting springs with different force constants and pre-compression values based on syringe size. This allows the pump to adapt its force characteristics to match the specific requirements of different syringe volumes, resolving the contradiction between consistency and versatility.
2Adaptability or versatility
If manual transfer of medication is required between syringes, then the pump can handle different syringe sizes, but contamination and patient stress increase
Solution Approach 1:
The pump is designed with universal compatibility to accept multiple syringe sizes directly without requiring transfer. By integrating size detection and automatic spring selection mechanisms, the system achieves multi-functionality while eliminating the harmful manual transfer process entirely.
Solution Approach 2:
The system performs self-configuration by automatically detecting syringe size and selecting the appropriate spring constant, eliminating the need for manual intervention in syringe replacement and reducing contamination risk through a closed, automated process.
3Device complexity
If a single spring constant is used for all syringe sizes, then the device complexity is reduced, but the force application becomes inappropriate for different syringe volumes
Solution Approach 1:
The spring system is segmented into multiple discrete spring options with different force constants, each optimized for specific syringe size ranges. The pump mechanism includes a selection system that divides the operational range into segments, assigning appropriate springs to each segment based on detected syringe volume.
Solution Approach 2:
The system dynamically selects and engages the appropriate spring based on real-time syringe size detection, transitioning between different spring constants as needed. This dynamic adaptation ensures manufacturing precision is maintained across all syringe sizes without requiring an overly complex fixed mechanism.
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.