Medicament Delivery Device Locking Mechanism
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Solution Overview
Problem
Conventional medicament delivery devices lack precision and safety in administering repeated doses, often requiring users to rely on visual feedback for accurate dosing and may accidentally be used before proper preparation, leading to potential errors and accidental actuation.
Innovation Solution
A medicament delivery device with a locking mechanism that includes a rotatable part and an indicator drum, allowing for precise, controlled, and safe intermittent injection of defined doses by preventing actuation until the device is ready for use, featuring a mechanism that inhibits movement of the plunger rod until the device is primed and indicating its readiness through color fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism with rotatable part is added to prevent accidental actuation, then safety is improved, but device complexity increases
Solution Approach 1:
The restraining member is integrated within the grip structure, nesting the safety function inside the existing device components rather than adding separate external mechanisms. The rotatable part is incorporated into the plunger rod assembly, allowing the locking mechanism to be embedded within the existing structural framework.
Solution Approach 2:
The device performs self-checking through the indicator mechanism that automatically shows when the device is ready for use. The restraining mechanism automatically engages and disengages based on the relative positions of components, eliminating the need for separate control systems.
2Reliability
If a restraining mechanism is added to block the rotatable part, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The indicator mechanism provides immediate visual feedback to the user about the device state, showing when the restraining member is engaged and when the device is ready for use. This feedback loop guides the user through the preparation steps and confirms when operation is safe.
Solution Approach 2:
The device requires preliminary preparation actions (moving medicament container and holder relative to grip) that must be completed before the restraining member disengages. This ensures proper setup is performed before dosing, with the indicator showing when preparation is complete.
3Reliability
If the device requires preparation steps before use, then safety is improved, but loss of time increases
Solution Approach 1:
The preparation steps (moving medicament container and holder into position) are performed in advance, and the indicator mechanism shows when these steps are complete and the device is ready for use. This ensures safety checks are done beforehand without delaying the actual dosing operation.
Solution Approach 2:
The mechanical restraining mechanism that blocks the rotatable part is automatically released when the medicament container and holder are moved into position, eliminating the need for manual unlocking steps. The preparation actions themselves trigger the release of the safety mechanism.
Data Source
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AI summary
Device for medicament delivery with syringe-like usability having a restraining mechanism A device for medicament delivery with syringe-like usability comprising at least one grip, at least one medicament container holder, and at least one plunger rod being substantially rotationally fixed relatively to the grip. The medicament container holder (13) is movable towards the grip in a longitudinal direction of the device, and rotation of at least one rotatable part (40), which is rotatable relatively to the grip and substantially inhibits movement of the plunger rod (20) in a longitudinal direction for dose delivery when in at least one locking position until being rotated, is restrained by at least one restraining member (42) abutting or being connected to the rotatable part (40) and the grip (30) until the medicament container holder is moved towards the grip for interacting with the at least one restraining member.