Injection Device Overpressure Protection Sensor Actuator
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Solution Overview
Problem
Existing injection devices lack effective overpressure protection, which can lead to physiological damage during medicament or anesthetic administration and potential damage to filters or tube systems, as excessive pressure can exceed safe limits, causing harm to tissues, nerves, and equipment.
Innovation Solution
An injection device with integrated overpressure protection, comprising a sensor that detects liquid pressure and an actuator that reduces pressure by using a braking mechanism or pressure relief valve to prevent further increase, ensuring safe pressure levels are maintained automatically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high actuation pressure is applied to force liquid out of the barrel, then liquid administration is achieved, but excessive pressure causes physiological damage to tissues and nerves
Solution Approach 1:
The patent implements a feedback mechanism where a sensor continuously monitors the liquid pressure within the barrel and feeds this information to a control unit. The control unit compares the measured pressure against a predetermined safety threshold and automatically activates a pressure relief valve when excessive pressure is detected, thereby preventing physiological damage while maintaining effective liquid administration.
Solution Approach 2:
The patent introduces a pressure relief valve as an intermediary component between the liquid source and the administration outlet. This valve acts as a safety mediator that automatically opens to release excess pressure when the sensor detects pressures exceeding the safety threshold, thus protecting tissues and nerves from damage while allowing normal liquid flow under safe pressure conditions.
2Productivity
If high actuation pressure is applied to force liquid out of the barrel, then liquid administration is achieved, but excessive pressure damages connected tube systems and filters
Solution Approach 1:
The sensor continuously monitors liquid pressure and provides real-time feedback to the control unit. When pressure exceeds the safety threshold that could damage tube systems or filters, the control unit activates the pressure relief valve to reduce pressure, thereby protecting connected components while maintaining liquid administration functionality.
Solution Approach 2:
The patent implements a preemptive safety mechanism where the pressure relief valve is pre-configured with a predetermined opening pressure threshold. This threshold is set below the pressure levels that would cause damage to tube systems and filters, providing beforehand protection by automatically relieving pressure before it reaches damaging levels.
3Device complexity
If manual pressure monitoring is relied upon, then device simplicity is maintained, but operator skill dependency reduces reliability of overpressure protection
Solution Approach 1:
The patent implements a self-service overpressure protection system where the sensor and control unit automatically monitor liquid pressure and activate the pressure relief valve without requiring operator intervention. The system independently detects excessive pressure conditions and responds by opening the relief valve, thereby eliminating dependency on operator skill while maintaining reasonable device complexity through automated safety functions.
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 provides autonomous protection against excessive pressure, preventing damage to tissues and equipment, ensuring safe administration of liquids by automatically limiting pressure to safe levels, independent of operator skill or external monitoring.
Implementation Method 1
The sensor is preferably a spring element arranged between the piston and a plunger acting upon the piston. The spring element detects in a technically simple manner an excessive pressure acting upon the piston.
Implementation Method 2
The braking device comprises braking elements arranged at the piston and deflected towards the inner wall of the barrel by the actuator. The actuator preferably comprises a braking device reducing the advancing rate of the piston relative to the barrel.
Data Source
AI summary
An injection device (10) for administering a liquid has a barrel (12) with an outlet (20) for the liquid, and a piston (14) arranged in the barrel (12). The piston is designed to force the liquid out from the outlet (20) by displacement into the barrel (12). The injection device (10) has an overpressure protection with a sensor (24) and with an actuator (26). The sensor (24) detects the pressure of the liquid in the barrel (12) directly or indirectly. The actuator (26) prevents a further increase in the pressure of the liquid.