Medical Injection Device Gas Evacuation Mechanism
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Solution Overview
Problem
Current injection systems require operator intervention and significant time to evacuate gas from the injection device, leading to potential gas embolism risks, inefficient use of medical liquids, and inaccurate dosing due to the need for manual positioning and monitoring.
Innovation Solution
An injection device with a piston and evacuation path that automatically evacuates gas by using a selector and purge valve configuration, allowing gas to be expelled without medical liquid, ensuring no gas is injected into the medical tubing, and maintaining accurate dosing through controlled pressure thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual gas evacuation is used, then gas can be removed from the injection device, but operator intervention and significant time are required
Solution Approach 1:
The system performs gas evacuation automatically using the piston's own movement to create pressure differentials that drive gas through the evacuation path, eliminating the need for external operator intervention or additional power sources
Solution Approach 2:
The evacuation path and selector are pre-configured within the piston structure, so that when the piston moves during normal operation, gas evacuation is automatically triggered without requiring separate manual steps
2Reliability
If manual positioning is used, then gas evacuation can be controlled, but operator involvement is required
Solution Approach 1:
The selector automatically positions itself based on the presence of gas or liquid in the chamber, using buoyancy or pressure differential to open or close the evacuation path without operator input
Solution Approach 2:
The manual mechanical positioning action is replaced by an automatic mechanical response system where the selector moves in response to physical conditions (gas presence, pressure) rather than operator command
3Reliability
If gas evacuation is performed, then gas is removed from the system, but medical liquid may be wasted
Solution Approach 1:
The selector extracts only the gas phase from the chamber by allowing gas to pass through while blocking liquid, separating the two phases and removing only the harmful gas component
Solution Approach 2:
The evacuation path is designed with selective permeability or blocking characteristics at different locations, allowing gas to be removed while preventing liquid loss through the same path
4Reliability
If rapid gas evacuation is implemented, then gas embolism risk is reduced, but dosing accuracy may be affected
Solution Approach 1:
Gas is evacuated from the chamber before the dosing operation begins, so that when dosing starts, only liquid remains in the system, ensuring accurate dosing measurements from the outset
Solution Approach 2:
The harmful gas component is extracted and removed from the chamber prior to dosing, leaving only the liquid medical product that needs to be dosed, thereby eliminating interference with dosing accuracy
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 solution enables automatic and rapid gas evacuation without operator involvement, preventing gas embolism, conserving medical liquids, and ensuring precise dosing by maintaining the medical liquid and gas separation within the injection device.
Implementation Method 1
a piston (6) arranged within the inner space (4) and configured for travelling within the inner space (4) along the longitudinal direction
Implementation Method 2
a selector (24, 60) arranged within the evacuation path between a lower portion (17a) of the evacuation path and an intermediate portion (17b) of the evacuation path, said selector (24, 60) being configured for selectively allowing the gas to go through said selector (24, 60) and to travel along the evacuation path
Implementation Method 3
a purge valve (22) arranged in the evacuation path between an intermediate portion (17b) of the evacuation path and an upper portion (17c) of the evacuation path and configured for moving between a blocking configuration in which the purge valve closes the evacuation path and a passing configuration in which the purge valve keeps open said evacuation path, wherein the passing configuration of the purge valve requires an overpressure in the intermediate portion (17b) of the evacuation path
Data Source
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AI summary
An injection device (1) for injecting a medical liquid, comprising: - a piston (6) arranged within an inner space (4) delimiting an upper space (4b) and a lower space (4a), - an evacuation path, said evacuation path traversing the piston (6) the lower space (4a) to the upper space (4b) of the inner space, - a selector (24) between a lower portion (17a) and an intermediate portion (17b) of the evacuation path, configured for selectively allowing the gas to go through and preventing the medical liquid from going through said selector (24, 50, 60), - a purge valve (22) between the intermediate portion (17b) of the evacuation path and an upper portion (17c) of the evacuation path and configured for moving between a blocking and a passing configuration which requires an overpressure in the intermediate portion (17b) caused by the piston (6) travelling towards the lower end of the body (2).