Medicament Injector Rotatable Member Locking Mechanism
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Solution Overview
Problem
Current injector devices for medicaments lack a reliable and compact mechanism to control the actuation of the piston rod, leading to potential accidental activation and inefficiencies in medicament delivery.
Innovation Solution
The injector device incorporates a rotatable member with a helical guide track and a projection system that allows the piston rod to be locked and released, ensuring controlled movement under the piston spring's force, utilizing a compact and space-efficient configuration to prevent accidental activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a release mechanism is added to control piston rod actuation, then reliability is improved, but device complexity increases
Solution Approach 1:
The rotatable member is disposed within the housing and integrates multiple functions: it engages with the needle sleeve to convert linear motion to rotation, simultaneously engages with the piston rod via guide track and projection to control locking and release, and all within the existing housing space. This nested configuration prevents accidental activation without adding external components.
Solution Approach 2:
The rotatable member serves multiple purposes: it acts as a conversion mechanism (linear to rotational motion), a locking mechanism (via guide track and projection engagement), and a release control (through rotational positioning). This multi-functionality improves reliability while minimizing the increase in device complexity.
2Reliability
If a rotatable member with guide track and projection is used, then reliability is improved, but volume of device increases
Solution Approach 1:
The rotatable member is disposed within the housing and utilizes the existing internal space efficiently. The guide track is formed on the rotatable member itself, and the projection engages with this track, creating a compact integrated mechanism that controls piston rod movement without requiring additional external space.
Solution Approach 2:
The mechanism converts the linear motion of the needle sleeve into rotational motion of the rotatable member, which then controls the piston rod through a different dimensional approach. The guide track and projection system uses rotational positioning (angular dimension) to control linear piston rod movement, optimizing space utilization within the housing.
3Manufacturing precision
If helical guide track is used for rotation control, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The helical guide track uses a curved, spiral path instead of straight lines or simple circular arcs. This helical geometry provides smooth, controlled rotation of the rotatable member as the needle sleeve moves linearly, ensuring precise angular positioning. The curved track is formed directly on the rotatable member, integrating the precision control function into the existing component.
Data Source
AI summary
An injector device includes an elongate housing configured to receive container of medicament. The injector device also includes a needle sleeve mounted within the housing and moveable between an extended position in which the needle sleeve at least partially extends from the distal end of the housing, and a retracted position in which the needle sleeve is received further within the housing than in the extended position. The injector device also includes a release mechanism configured to control actuation of a piston rod. The release mechanism includes a rotatable member disposed within the housing and in cooperating engagement with the needle sleeve such that movement of the needle sleeve from the extended position to the retracted position causes the rotatable member to rotate within the housing from a first position to a second position.