Elastic Securing Arm for Syringe Flange Retention
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Solution Overview
Problem
Existing syringe securing mechanisms in housings rely on adapters or friction, which are limited to securing a single syringe size and lack versatility in accommodating different syringe sizes and shapes.
Innovation Solution
A securing device with a hollow body and elastically flexible securing arms that allow a syringe with a radially projecting flange to be securely positioned, featuring a radial flange clearance and a flange gap, enabling the flange to pass through while preventing proximal movement, thus securing the syringe without relying on friction or precise dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If adapters or friction-based mechanisms are used to secure syringes, then a single syringe size can be secured, but the device cannot accommodate different syringe sizes and shapes
Solution Approach 1:
The securing arm utilizes elastic flexibility to change its dimensional parameters dynamically. When the syringe is inserted, the securing arm flexes outward to accommodate the flange, then returns to its original position to secure the syringe. This elastic parameter change allows the same securing mechanism to adapt to different syringe sizes without requiring multiple adapters or precise pre-matching of dimensions.
Solution Approach 2:
The securing arm transitions from a static friction-based or adapter-based system to a dynamic elastic system. The arm can move radially outward during insertion and then return to secure the syringe, providing adaptability through motion rather than through multiple fixed configurations or adapters.
2Reliability
If friction-based securing is used, then the mechanism is simple, but it cannot reliably prevent accidental removal
Solution Approach 1:
The securing arm features a curved inner surface with a specific radius of curvature that complements the flange geometry. This curved surface provides reliable contact geometry that prevents accidental removal while maintaining structural simplicity. The curvature ensures positive mechanical engagement rather than relying on friction alone.
Solution Approach 2:
The securing arm is divided into distinct functional portions: a first portion that extends radially outward to form clearance, a second portion that contacts the flange, and a biasing mechanism. This segmentation allows each portion to perform its specific function optimally while keeping the overall structure relatively simple.
3Ease of operation
If the securing arm is made rigid to prevent movement, then the syringe is securely held, but the flange cannot pass through during insertion
Solution Approach 1:
The securing arm changes its dimensional parameters through elastic deformation during insertion, then returns to its original stable configuration to secure the syringe. The arm flexes outward to allow flange passage, then the biasing force returns it to its original position where it contacts the flange to prevent proximal movement. This dynamic parameter change resolves the contradiction between insertion ease and securing stability.
Solution Approach 2:
The securing arm transitions from a static rigid structure to a dynamic elastic structure that can adapt its configuration. During insertion, the arm moves radially outward to accommodate the flange, then returns to its original position to provide stable securing. This dynamic behavior allows both easy insertion and reliable securing without requiring the arm to be either completely rigid or completely flexible.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a reliable and versatile method to secure syringes of various sizes and shapes, ensuring they are firmly held in place without requiring precise dimensions or surface characteristics, reducing the risk of accidental removal and enhancing user safety.
Implementation Method 1
The securing arm is elastically flexible to permit at least the second portion to pivot radially outwardly relative to the body to allow the flange to pass the second portion as the syringe is advanced distally into the opening
Implementation Method 2
The securing arm is biased to the rest position such that after the flange passes the second portion, the distally-facing surface of the second portion is configured to contact the proximally-facing surface of the flange to prevent the flange from moving proximally past the securing arm
Data Source
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AI summary
A securing device for an injection device which receives a syringe with a proximal end portion having a radially outwardly projecting flange, has a body with proximal and distal end portions, an opening for accepting the syringe, an outer surface, and a proximal end surface for contacting a distally-facing surface of the flange when the syringe is advanced distally, preventing further advancement. A securing arm includes a free end; a base end fixed to the outer surface; a first portion extending radially outwardly from the base end to permit the flange to pass; and a second portion extending radially inwardly in a rest position, contacting the flange as the syringe is advanced. The securing arm is elastically flexible to allow the free end to move radially outwardly, allowing the advancing flange to pass, and is biased to the rest position to secure the flange and the syringe against proximal movement.