Dynamic Centrifugal Braking for Injection Device Protection
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Solution Overview
Problem
Injection devices face damage due to extreme acceleration when a product container is not inserted, leading to uncontrolled medication release and potential device failure, as existing braking mechanisms do not prevent high accelerations during dispensing processes with insufficient product.
Innovation Solution
A braking device that generates a significant braking force to prevent excessive rotation or movement of parts, designed to be adaptable and integrated into the injection device, utilizing mechanisms such as a brake disc with counter-elements, centrifugal brakes, or fluid brakes to convert mechanical energy into heat, effectively limiting angular velocity and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a braking mechanism is designed to generate high braking force to prevent damage when product container is not inserted, then device reliability is improved, but normal dispensing operation is hindered due to excessive braking effect
Solution Approach 1:
The braking force is made dynamic rather than static. The friction element is pressed against the rotating element with a spring force that varies with rotational speed. At low speeds during normal dispensing, the spring force is small providing minimal braking. At high speeds during malfunction, the centrifugal effect increases the spring compression providing strong braking force automatically
Solution Approach 2:
The braking characteristic changes with rotational speed parameter. The spring-loaded friction mechanism transforms the constant spring force into a speed-dependent braking force through the centrifugal effect on the friction element, achieving different braking levels at different operating conditions
2Reliability
If the driven member is pushed back too far or only a half-filled ampoule is used, then extreme acceleration values occur during the idle stroke, but no braking mechanism is activated since product is being dispensed
Solution Approach 1:
The braking mechanism is self-regulating and does not require external control systems. The spring-loaded friction element automatically engages based on rotational speed alone. When the driven member moves too fast due to idle stroke or insufficient product, the increased speed automatically increases the braking force through centrifugal effect on the spring
Solution Approach 2:
The complex electronic or pneumatic braking systems are replaced with a simple mechanical spring-friction mechanism. The braking force is generated purely through mechanical means using spring force and friction, eliminating the need for sensors, motors, or control electronics
3Reliability
If dimensional increases are made to accommodate braking mechanisms that work throughout dispensing, then device reliability is improved, but device size becomes bulky
Solution Approach 1:
The braking mechanism applies only the necessary amount of braking force required for safety, not continuous full braking. The spring force is calibrated to provide minimal resistance during normal operation and only engages significantly when speed exceeds safe thresholds, avoiding excessive dimensioning
Solution Approach 2:
The braking function is extracted as a separate modular friction-brake assembly that can be integrated into the existing drive mechanism without requiring complete redesign of the dispensing system. The brake components (friction element, spring, anchor) are added as discrete elements rather than requiring overall system enlargement
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 braking device effectively limits the angular velocity of moving parts, preventing damage to the injection device by generating a negligible braking effect when a product container is inserted and a substantial braking effect when not inserted, thus ensuring safe operation and prolonging device lifespan.
Implementation Method 1
The braking mechanism preferably dampens the mechanical movement. As is well known, damping depends on speed. The maximum damping is preferred in the braking mechanism according to the invention.
Data Source
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AI summary
The invention relates to a braking device for an injection device for generating a braking action on a moving or rotating part of the injection device.