Radial Syringe Loading Interface for Injection Devices
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Solution Overview
Problem
Existing injection devices require complex handling and precise positioning of syringes and drive members, leading to increased costs, risks of malfunctions, and difficulties in quickly loading or removing syringes without active subsystems.
Innovation Solution
An injection device with a radial translation interface module that allows syringe insertion and removal without rotation, featuring a drive member that couples with the syringe's piston in a single step, using a lateral opening and pivotable jaws for secure engagement and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bayonet principle mechanism is used for syringe engagement, then the syringe can be locked to the injection device, but the handling becomes more complex and requires precise positioning
Solution Approach 1:
The engagement mechanism is divided into two independent interface modules: a first interface module for mechanical attachment of the syringe body to the housing, and a second interface module for connecting the piston to the drive member. This segmentation allows each module to be optimized independently, simplifying handling while maintaining reliable locking.
Solution Approach 2:
The piston connection function is extracted from the syringe body attachment process. The drive member can engage the piston independently through the second interface module, allowing the syringe to be loaded without requiring precise positioning of the piston, thereby simplifying operator handling.
2Reliability
If an actuator is used to grab the syringe's piston, then the piston can be connected to the drive member, but the device complexity increases
Solution Approach 1:
The piston is designed with a self-aligning feature where its longitudinal axis automatically aligns with the drive member's longitudinal axis during insertion. This self-service mechanism eliminates the need for external actuators or active subsystems to grab and position the piston, reducing device complexity while ensuring reliable connection.
Solution Approach 2:
The interface module creates an equipotential condition where the piston and drive member are at the same longitudinal axis position during engagement. This geometric alignment ensures that the piston naturally couples with the drive member without requiring additional actuators, simplifying the overall device structure.
3Manufacturing precision
If precise positioning of the syringe is required during insertion, then the connection can be accurate, but the loading time increases
Solution Approach 1:
The first interface module serves multiple functions: it attaches the syringe body to the housing, guides the syringe into the correct position, and supports the weight of the syringe. This multi-functionality eliminates the need for separate positioning mechanisms, allowing quick loading without compromising precision.
Solution Approach 2:
The first interface module acts as an intermediary between the syringe and the injection device, providing a robust mechanical attachment that automatically positions the syringe correctly during insertion. This intermediary structure simplifies the loading process by eliminating the need for precise manual positioning by the operator.
Data Source
AI summary
An injection device (1) for delivering a medical fluid, comprising an interface module (4) configured to receive a syringe (6), the interface module (4) defining a reception space (40) adapted to receive a flange (12a) in the outer periphery of a barrel (10) of the syringe (6), a drive member (8) configured to couple a piston of the syringe, and to translate along a longitudinal axis (X). The interface module (4) comprises a lateral opening (46) defined between two supporting members (50) of the interface module (4) and extending radially in a first radial direction from the longitudinal axis (X), said lateral opening (46) adapted for a radial translation of the syringe (6) in the first radial direction to a loaded position in which the flange (12a) of the syringe (6) is received in the reception space and the barrel (10) of the syringe (6) extends along the longitudinal axis (X).