Injection Device Electronic Detector Sealing Mechanism
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Solution Overview
Problem
Existing drug delivery devices with electronic detectors face challenges in protecting the sensors from environmental impurities while maintaining precise and reliable operation, as wrapping the detectors in covers can lead to internal reflections and absorption, affecting their functionality.
Innovation Solution
The injection device incorporates a gasket that seals the electronic detector's cavity against impurities when not in use, allowing movement during dose setting and dispensing, and temporarily abrogates the seal to enable component relative motion without compromising sensor precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the electronic detector is wrapped in a cover to protect it from environmental impurities, then the protection against dust and humidity is improved, but internal reflections and absorption occur affecting sensor precision
Solution Approach 1:
The electronic detector is extracted from the sealed cavity during operation. The first component moves relative to the housing to open the cavity, allowing the detector to be exposed to the external environment temporarily for precise measurement, then returns to the sealed position for protection. This temporal separation resolves the contradiction between protection and precision.
Solution Approach 2:
The sealing structure is made dynamic rather than static. The cavity seal is continuously opened and closed based on operational requirements. During dose setting and measurement, the cavity is open for precision; during storage and non-use, the cavity is sealed for protection. This dynamic behavior allows the system to adapt to different functional states.
2Reliability
If the cavity is sealed to protect the electronic detector, then reliability is improved, but relative movement between components is restricted
Solution Approach 1:
The sealing arrangement is designed to be dynamically openable and closable. The first component's relative movement to the housing opens the cavity, enabling component adjustment and operation. When the first component returns to its initial position, the cavity closes automatically, maintaining the seal for reliability. This dynamic mechanism reconciles the need for both protection and operational flexibility.
3Object-affected harmful factors
If the gasket maintains continuous seal to protect against impurities, then protection is improved, but operational movement is hindered
Solution Approach 1:
The sealing action operates periodically rather than continuously. The gasket maintains contact and seals the cavity during protected states (storage, non-use). During operational states (dose setting, measurement), the gasket temporarily disengages to allow rapid component movement. This periodic sealing behavior ensures both effective protection when needed and unrestricted movement during operation.
Data Source
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AI summary
The present disclosure relates to an injection device (30) for administering of a dose of a medicament (27), the injection device (1) comprising: - a housing (32) extending along a longitudinal direction (2, 3) and configured to accommodate a cartridge (6) filled with the medicament (27), - a drive mechanism (34) configured to operably engage with the cartridge (6) for dispensing of the dose of the medicament (27), - a first component (100) movable relative to the housing (32) along the longitudinal direction (2, 3) between an initial position and a trigger position for dispensing of the dose of the medicament (27), - a second component (200) rotatable relative to the housing (32) for at least one of setting of the dose and dispensing of the dose, - a cavity (150) provided in or formed by at least one of the first component (100) and the second component (200), the cavity (150) been sized to accommodate an electronic detector (300), wherein one of the first component (100) and the second component (200) is configured for attachment of the electronic detector (300), which electronic detector (300) is configured to recognize a code (330) provided on the other one of the first component (100) and the second component (200), - at least a first gasket (400) fastened to one of the housing (32), the first component (100) and the second component (200) and configured to seal the cavity (150) against ingress of impurities at least while the first component (100) is in the initial position.