Medicament Delivery Device Blocking Sleeve Mechanism
Solution Overview
Problem
Existing medicament delivery devices, such as autoinjectors, face challenges in ensuring the needle cover is properly secured and reset without the risk of loss or detachment, especially during use or accidental drops.
Innovation Solution
A medicament delivery device design featuring a user-operated component permanently attached to the housing, which moves from a first position to a second position to allow the delivery member cover to transition from an extended to a retracted position, while maintaining the component's attachment to the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user-operated component is made removable for easy resetting, then the ease of operation is improved, but the reliability deteriorates due to risk of loss or detachment during use or accidental drops
Solution Approach 1:
The device is divided into permanently attached components (housing, delivery member cover, blocking sleeve) and a removable user-operated component. The permanent attachment of critical components ensures reliability while the removable user-operated component maintains ease of operation for resetting without risking loss.
Solution Approach 2:
The blocking sleeve acts as an intermediary component that is permanently attached to the housing and mediates between the user-operated component and the delivery member cover. It provides a stable, reliable interface that prevents detachment while allowing the user-operated component to be reset through its interaction with the blocking sleeve.
2Stability of the object's composition
If the delivery member cover is blocked from moving to the retracted position, then the stability of the object's composition is improved, but the ease of operation deteriorates
Solution Approach 1:
The blocking sleeve is designed to be dynamically controllable through rotation. When rotated to the first position, it blocks the delivery member cover from moving to the retracted position, providing stability. When rotated to the second position, it allows the delivery member cover to move freely, providing ease of operation. This dynamic control resolves the contradiction between stability and ease of operation.
Solution Approach 2:
The rotational position of the blocking sleeve changes the blocking parameter. At the first position, the blocking parameter is active (preventing movement). At the second position, the blocking parameter is inactive (allowing movement). This parameter change enables the system to switch between stable and operable states as needed.
Data Source
AI summary
The present disclosure provides a medicament delivery device including a housing having a proximal housing end and a distal housing end, a user-operated component permanently attached to the housing, and arranged to move from a first position to a second position relative to the housing, a delivery member cover protruding from the proximal housing end, and configured to be moved from an extended position relative to the housing to a retracted position, and a blocking sleeve arranged axially fixed relative to the housing when the user-operated component is in the first position. The blocking sleeve has a proximally facing surface axially aligned with and facing a distally facing surface of the delivery member cover when the user-operated component is in the first position, preventing the delivery member cover from moving to the retracted position. The user-operated component is configured to move the proximally facing surface to a position offset from the distally facing surface when the user-operated component is moved to the second position, allowing the delivery member cover to move from the extended position to the retracted position.