Needle-less Syringe Adapter Hermetic Sealing Mechanism
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Solution Overview
Problem
Conventional needle-less syringe adapters have poor hermetic characteristics, leading to backflow of liquid medicine and air, causing patient discomfort and reducing the effectiveness of subsequent injections due to residual medicine mixing with new doses.
Innovation Solution
A needle-less syringe adapter featuring a tube with a resilient valve and piercing conduit that hermetically seals the top and bottom slits, preventing backflow by compressing and recovering to seal the openings during injection and disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional adapter is used for needle-less syringe, then the adapter structure is simple, but the hermetic characteristics are poor causing backflow of liquid medicine and air
Solution Approach 1:
The adapter is divided into multiple functional components: a resilient valve assembly with piercing conduit, a sealing assembly with O-ring, and a distal occlusion mechanism. This segmentation allows each component to address specific hermetic requirements, resolving the backflow issue while maintaining manageable overall complexity
Solution Approach 2:
The resilient valve is pre-configured with the piercing conduit in a retracted position, and the sealing elements are pre-positioned within the adapter body. When the syringe is connected, the piercing conduit automatically extends to pierce the syringe wall beforehand, establishing the hermetic seal before any injection occurs, preventing backflow from the start
2Loss of substance
If the adapter has vacant space, then the adapter structure is simple, but liquid medicine and air remain in the adapter after injection
Solution Approach 1:
The piercing conduit is designed to extend through the adapter body and pierce the syringe wall, creating a direct fluid pathway that bypasses the adapter's internal vacant space. This extraction of the fluid path from the adapter cavity prevents medicine and air from remaining in the adapter after injection
Solution Approach 2:
The resilient valve acts as an intermediary mechanism between the adapter and syringe. It controls the opening and closing of the fluid pathway, ensuring complete discharge of medicine while preventing backflow of air and residual medicine into the adapter's vacant space
3Productivity
If remaining liquid medicine and air are injected into patient's blood vessel, then the injection procedure is continuous, but the patient's blood vessel expands inadvertently causing pain
Solution Approach 1:
The adapter performs preliminary purging of residual medicine and air through the piercing conduit before the actual injection begins. This preliminary action ensures the blood vessel is ready to receive the full therapeutic dose without inadvertent expansion from residual substances, preventing patient pain while maintaining procedure continuity
Solution Approach 2:
The resilient valve provides feedback control by responding to pressure changes during injection. When injection pressure decreases or reverses, the valve automatically closes to prevent backflow, ensuring the blood vessel does not undergo inadvertent expansion and preventing patient discomfort
4Reliability
If blood and liquid medicine flow backwards into the adapter, then the adapter has vacant space, but the curative effect is lowered due to mixing with new liquid medicine
Solution Approach 1:
The piercing conduit extracts the fluid pathway from the adapter's internal vacant space, creating a direct connection between the syringe and output. This prevents backward flow of blood and medicine into the adapter, ensuring the curative effect is maintained while the adapter structure remains relatively simple
Solution Approach 2:
The adapter incorporates a disposable sealing assembly with O-ring and resilient valve that ensures complete containment and prevents contamination. This disposable component approach guarantees reliable hermetic sealing for each use, maintaining curative effect without requiring complex reusable sealing mechanisms
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 adapter effectively prevents backflow of air and liquid medicine, reducing patient pain and maintaining the efficacy of subsequent injections by minimizing residual medicine and air within the adapter.
Implementation Method 1
a resilient valve (2) mounted in the cavity (11) and having a chamber (21), a top slit (211) and a bottom slit (212)
Implementation Method 2
The piercing conduit (3) is mounted in the chamber (21), is driven to move when the resilient valve (2) is compressed
Data Source
AI summary
A needle-less syringe adapter has a tube, a resilient valve, a piercing member and an injection member. The tube has a body has a cavity and an outlet hole. The resilient valve is mounted in the cavity and has a chamber, a top slit and a bottom slit. The piercing conduit is mounted in the chamber, is driven to move when the resilient valve is compressed, selectively extends out through the top and bottom slits and has a through hole defined through the piercing conduit. The injection member is mounted on the tube and is selectively sealed by the resilient valve. The needle-less syringe adapter has excellent hermetical characteristics to prevent air infiltration and backflow of bloody and liquid medicine in a patient's blood vessel.