Dual-Syringe Injection Device with Verification Shutter
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Solution Overview
Problem
Current injection systems, particularly in dermatology and cosmetics, face challenges with safe and reliable injection of dermal fillers due to the high dynamic viscosity of these products, making it difficult to aspirate blood before injection, leading to risks of intravascular injection and product loss.
Innovation Solution
A dual-syringe system with a verification device that allows for safe aspiration of body fluids by using a less viscous saline solution to indicate if the needle is in a blood vessel, preventing intravascular injection and minimizing product loss through separate barrels and a shutter mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high viscosity filler product is used for injection, then the desired cosmetic or dermatological effect is achieved, but the ability to aspirate blood before injection is compromised
Solution Approach 1:
The syringe is divided into two separate barrels: a first barrel for containing the high viscosity filler product and a second barrel for containing a low viscosity aspiration fluid. This segmentation allows each barrel to serve its specific function optimally - the first barrel maintains product integrity while the second barrel enables easy blood aspiration without being contaminated by the viscous filler.
Solution Approach 2:
A shutter mechanism acts as an intermediary component that controls fluid flow between the two barrels and the needle. The shutter can selectively allow the low viscosity fluid from the second barrel to flow toward the needle for aspiration, or allow the filler from the first barrel to flow toward the needle for injection, thereby mediating between the two different viscosity requirements.
2Reliability
If air is removed from the syringe by purging with the active product, then safe injection is ensured, but product loss occurs
Solution Approach 1:
The shutter mechanism serves as a flow mediator that directs the low viscosity aspiration fluid through the needle during purging operations. This allows air to be expelled from the needle without requiring the expensive active filler product, thereby preventing product loss while still ensuring safe injection by removing air bubbles.
Solution Approach 2:
The invention uses a low viscosity, inexpensive fluid (such as saline or water) in the second barrel for purging and aspiration purposes. This cheap fluid can be discarded after use, whereas the active filler product in the first barrel is preserved for its intended cosmetic or dermatological application, avoiding unnecessary loss of the expensive active substance.
3Reliability
If a dual-syringe system is implemented for safe aspiration, then intravascular injection is prevented, but device complexity increases
Solution Approach 1:
The invention combines two syringe barrels, a shutter mechanism, and a shared needle into a single integrated assembly. This merging allows the complex functionality of safe aspiration and injection to be achieved within one device, rather than requiring two separate devices or complex external attachments, thereby reducing overall system complexity while maintaining safety.
Solution Approach 2:
The single needle serves multiple functions: it can deliver the high viscosity filler from the first barrel, aspirate fluid from the second barrel for blood detection, and expel air during purging. The shutter mechanism provides universal control over fluid flow direction, managing both aspiration and injection functions through a single component, thereby simplifying the overall device architecture.
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
Ensures safe and reliable injections by preventing intravascular placement of needles and reducing product waste, while maintaining a simple and cost-effective design for easy use.
Implementation Method 1
a second plunger being displaceably mounted in said second syringe barrel so as to cause a depression at the distal end of said hollow needle whereby a body fluid sample is aspirated into said second syringe barrel
Data Source
AI summary
An injection syringe for injecting a first injectable product into a body injection site of an individual, includes a first barrel containing a first product, a first syringe barrel containing the first injectable product, a first plunger displaceably mounted in the first syringe barrel; a hollow needle to be inserted into the body injection site; an adapter connected to the first syringe barrel and the needle, and a verification device to ensure that, when the first injectable product is injected, the hollow needle is not introduced into a blood vessel. The verification device includes a second syringe barrel containing a second product and connected to the adapter and a second plunger displaceably mounted in the second syringe barrel to cause a depression at the distal end of the hollow needle.