Injection Device Syringe Holder Front Support
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Solution Overview
Problem
Existing injection devices for administering viscous medications risk breaking the glass syringe due to excessive forces required for delivery, which can lead to injury and uncontrolled medicament ejection, especially when using standard syringes subjected to clinical trials and regulatory approvals.
Innovation Solution
The injection device features a syringe holder that supports the syringe at its front end, providing a reaction surface for axial compressive force during medicament delivery, reducing tension on the glass barrel and incorporating radially flexible fingers to minimize assembly risks and ensure proper alignment without damaging the needle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a standard glass syringe is used to administer viscous medications, then the syringe can be used with clinically approved medications, but the glass barrel may break due to excessive forces required for delivery
Solution Approach 1:
The injection device introduces itself as an intermediary component between the user and the standard glass syringe. The device housing engages with the syringe barrel externally, providing structural support and force distribution during injection. This mediator approach allows the use of standard glass syringes while preventing breakage through the device's protective structure.
Solution Approach 2:
The device provides beforehand cushioning by distributing injection forces through its housing structure before they reach the glass syringe barrel. The housing acts as a cushioning element that absorbs and distributes the high forces required to deliver viscous medications, preventing these forces from concentrating on weak points in the glass barrel.
2Productivity
If greater force is applied to expel viscous liquid from the syringe, then delivery of the medication is achieved, but the risk of syringe breakage increases
Solution Approach 1:
The device housing serves as an intermediary that manages the force application during medicament delivery. It distributes the high forces required for viscous liquid delivery across multiple contact points on the syringe, preventing force concentration that would compromise syringe integrity while maintaining delivery efficiency.
Solution Approach 2:
The housing structure provides beforehand cushioning by being in place before force application begins. It creates a protective framework that cushions the syringe against the high forces needed to expel viscous medications, allowing productive delivery without compromising reliability.
3Device complexity
If the syringe is supported at the rear end, then assembly is simplified, but excessive tension is applied to the glass barrel during injection
Solution Approach 1:
The invention inverts the conventional support approach by supporting the syringe at its front end rather than its rear end. This inversion changes the force distribution pattern, placing the support point where it can counteract injection forces more effectively and reduce tensile stress on the glass barrel during the injection process.
Solution Approach 2:
The device applies local quality by providing targeted support at the front end of the syringe where the injection forces are applied. This localized support at the critical stress point is more effective than distributed rear support, reducing overall tension on the barrel while maintaining assembly simplicity.
4Object-affected harmful factors
If a retractable needle is used, then user safety is improved by concealing the needle, but device complexity increases
Solution Approach 1:
The needle retraction mechanism operates through self-service by utilizing the natural injection forces and spring mechanisms already present in the device. The needle is pushed forward by injection pressure and automatically retracts when pressure equalizes, eliminating the need for complex motorized or manually-operated retraction systems.
Solution Approach 2:
The needle retraction function is merged with the injection mechanism itself. The same pressure that drives the injection forward also drives needle retraction backward, combining two functions into one integrated system rather than requiring separate mechanisms for injection and needle management.
Data Source
AI summary
An injection device comprising a housing in which can be mounted a syringe comprisinga barrel for holding a volume of medicament,a needle at one end of the barrel anda plunger axially-moveable in the barrel to a forwardmost position,the injection device further comprising a syringe support means for supporting the barrel at an axial location at or forward of the forwardmost position of the plunger and having a reaction surface for the syringe, whereby in use said reaction surface provides an axial compressive force on said barrel when a forward axial force is applied to the plunger.