Compact Medicament Delivery Device With Radial Locking
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Solution Overview
Problem
Existing medicament delivery devices are not compact enough, and there is a need for an improved design that allows for more efficient use of space while maintaining functionality.
Innovation Solution
A medicament delivery device with a plunger rod and catch mechanism that includes a locking element movable between first and second positions, controlled by a release member, allowing for compact design and efficient medicament injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional plunger rod mechanism is used with a release mechanism, then the device can deliver medicament reliably, but the device size becomes larger and less compact
Solution Approach 1:
The locking mechanism is segmented into discrete components: a locking element with distinct first and second positions, a catch with engagement and non-engagement configurations, and a release member. This segmentation allows each component to be optimized for its specific function while maintaining overall compactness of the device.
Solution Approach 2:
The locking element is designed to be movable between two positions rather than fixed, allowing it to transition from a locked state (preventing plunger rod movement) to an unlocked state (permitting plunger rod movement). This dynamic design enables reliable medicament delivery control while maintaining a compact structure that doesn't require additional bulky locking mechanisms.
2Volume of moving object
If the locking element is restrained in the proximal direction, then the device maintains a compact form factor, but the plunger rod cannot move distally to deliver medicament
Solution Approach 1:
The locking element's movement is constrained to radial displacement rather than longitudinal movement. The locking element moves radially inward to engage the catch and radially outward to disengage, allowing the plunger rod to move the full distal distance needed for medicament delivery while the locking mechanism itself occupies minimal space in the longitudinal dimension.
Solution Approach 2:
The catch acts as an intermediary between the locking element and the plunger rod engagement surface. The catch translates the radial movement of the locking element into the functional locking and unlocking of the plunger rod, enabling compact locking mechanism design while maintaining full plunger rod travel distance for medicament delivery.
Data Source
AI summary
A medicament delivery device for injecting medicament comprises a body 301 comprising a distal end, a proximal end, and a longitudinal axis extending from the distal end to the proximal end. A plunger rod is configured to be movable in a distal direction of the body, the plunger rod comprising a plunger rod engagement surface. A locking element is moveable from a first position to a second position. In the first position, movement of the plunger rod in the distal direction is prevented. In the second position, movement of the plunger rod in the distal direction is permitted. A release member is configured to be moveable from a blocking position in which the release member is configured to prevent the locking element from moving to a release position in which the release member is configured to permit the locking element to.