Medication Cassette Axial Locking Mechanism Prevents Accidental Dispensing
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Solution Overview
Problem
Existing drug dispensing devices are not secure, as they can be accidentally activated by users, leading to improper drug release and potential health risks, and lack sufficient mechanical strength for handling by untrained individuals, especially for small-sized medications.
Innovation Solution
A cassette with a locking mechanism that requires an unlocking member to rotate, featuring a pusher moved by a release member through an axial passage, ensuring the locking device is hidden and inaccessible for accidental manipulation, and a drum with radial partitions for secure storage and controlled dispensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a peripheral locking element is used for the wheel, then the wheel can be locked relative to the housing, but the locking mechanism becomes accessible to users and can be accidentally activated, leading to improper drug release
Solution Approach 1:
The locking mechanism is extracted from the peripheral location and relocated to the axial passage area. The pusher element is positioned within the axial passage, making the locking mechanism inaccessible from the periphery while maintaining its locking function. This extraction eliminates the possibility of accidental activation from the outside.
Solution Approach 2:
The locking mechanism is repositioned from a peripheral two-dimensional location to a three-dimensional position within the axial passage. The pusher element extends axially into the passage, creating a locking action in a different dimensional space that is inaccessible from the external periphery.
2Ease of operation
If radial slots are formed in the casing, wheel, and locating disc, then the wheel can rotate within the housing, but the torsional strength of the cassette is reduced, leading to risk of casing and wheel separation
Solution Approach 1:
Instead of using continuous radial slots that penetrate the entire structure, the design segments the rotational interface into discrete engagement points. The locking mechanism engages at specific locations within the axial passage, providing rotational control without creating continuous weak points through the casing walls.
Solution Approach 2:
The cassette employs a composite construction combining a rigid housing with a drum made of elastomeric or flexible material. This composite structure provides both the necessary rotational flexibility and structural strength, eliminating the need for reinforcing slots while maintaining torsional integrity.
3Ease of operation
If studs form pairs of gaps for the locating disc, then the wheel can rotate, but the compartments are not perfectly sealed, allowing inappropriate release of medications
Solution Approach 1:
The gaps between compartments are extracted and sealed by the pusher element. As the pusher moves axially within the passage, it contacts the drum and eliminates gaps between adjacent compartments, creating a sealed environment that prevents medication leakage while allowing controlled rotation.
Solution Approach 2:
The drum is constructed from elastomeric or flexible material that can deform to seal against the housing and adjacent compartments. This flexible shell creates a hermetic seal that prevents medication leakage while accommodating the rotational movement of the drum within the housing.
4Reliability
If the locking device is made inaccessible through axial passage, then accidental activation is prevented, but the release mechanism becomes more complex
Solution Approach 1:
The pusher element is designed to be automatically moved by the insertion and rotation of the drum itself. The drum's rotation within the housing naturally drives the pusher axially, which in turn engages or disengages the locking mechanism. This self-service mechanism eliminates the need for separate, complex release devices.
Solution Approach 2:
The functions of drum rotation and pusher movement are merged into a single integrated action. The drum's rotational motion is directly coupled to the axial movement of the pusher element, combining two functions into one simple mechanism that achieves both rotation and secure locking without additional complexity.
Data Source
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AI summary
The invention concerns a cassette (1) for storing and dispensing products that are not purely gaseous, comprising: - a housing (2); - a drum (3) that is rotatably guided relative to the housing (2) about an axis (8) of rotation passing through the centre of the drum (3); - a chamber for storing products that are not purely gaseous; - an immobilising device (5) capable of: in a first position, referred to as the immobilising position, immobilising the drum (3) in rotation relative to the housing (2), and; in a second position, referred to as the rotation position, allowing the drum (3) to rotate relative to the housing (2); characterised in that it has an axial passage (7) extending along the axis (8) of rotation of the drum (3), and in that; - the immobilising device (5) comprises at least one push button (9) arranged relative to the axial passage (7) in such a way as to be able to be moved: .by a release member inserted into the axial passage (7); .to a position of the push button, referred to as the release position, in which the immobilising device (5) is in the rotation position.