Needle System With Movable Rod For Bacterial Barrier
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Solution Overview
Problem
Existing needle systems for injection and aspiration through subcutaneous vein ports are prone to bacterial contamination, leading to infections and potential discontinuation of patient treatment.
Innovation Solution
A needle system with a unique design featuring a conduit and needle section oriented along different longitudinal directions, combined with a rod control assembly that shifts the needle between open and closed states to minimize bacterial entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Huber needle is used to penetrate the subcutaneous venous port membrane, then the membrane integrity is maintained and leakage is avoided, but the needle carries bacteria that can infect the patient
Solution Approach 1:
The needle system incorporates a movable rod that can shift between positions to dynamically change the needle section from a closed state (blocking the distal end opening) to an open state (allowing fluid flow). This dynamic mechanism allows the system to maintain membrane integrity during storage and transport while enabling controlled access during use, thereby reducing bacterial contamination risk without compromising reliability
Solution Approach 2:
The rod control assembly is designed to automatically push the rod to block the distal end opening of the needle section before insertion, ensuring the needle is in a closed state ready for use. This preliminary action prevents bacterial contamination from entering the subcutaneous venous port during the insertion process, while the rod can be shifted to open the needle section when fluid flow is required
2Productivity
If the needle section remains open for continuous injection and aspiration, then patient treatment is uninterrupted, but bacterial contamination and infection risk increase
Solution Approach 1:
The movable rod mechanism allows the needle section to dynamically transition between open and closed states. During treatment, the rod can be shifted to open the needle section for uninterrupted injection and aspiration, then returned to block the distal end opening to prevent bacterial contamination. This dynamic capability enables continuous patient care while maintaining infection prevention
Solution Approach 2:
The rod control assembly is configured to automatically return the rod to its blocking position after fluid flow is completed, without requiring manual intervention. This self-service mechanism ensures that the needle section automatically closes to prevent bacterial contamination after use, while allowing rapid reopening when treatment is needed, thus maintaining both productivity and safety
3Object-affected harmful factors
If the rod blocks the distal end opening to prevent bacterial entry, then infection risk is reduced, but fluid injection and aspiration cannot occur
Solution Approach 1:
The rod is designed as a movable component that can shift its position along the needle section. When the rod blocks the distal end opening, it creates a bacterial barrier while preventing fluid flow. When the rod shifts to an open position, it allows fluid injection and aspiration. This dynamic positioning enables the system to adapt between protection mode and operation mode as needed
4Ease of manufacture
If the needle system uses a simple fixed structure, then manufacturing is easy and device complexity is low, but it cannot provide both closed and open states for infection prevention and fluid flow
Solution Approach 1:
The invention adds a movable rod component with a control assembly to the needle system, enabling it to transition between closed and open states. This dynamic element provides the versatility needed for infection prevention and fluid flow operations. The rod control assembly can be integrated into the existing needle structure using standard mechanical components, maintaining ease of manufacture while achieving the desired adaptability
Solution Approach 2:
The movable rod mechanism serves multiple functions: it blocks the distal end opening to prevent bacterial contamination, allows fluid flow when shifted to an open position, and can be controlled manually or automatically. This multi-functional component provides the versatility needed for both infection prevention and fluid injection/aspiration operations within a single integrated system
Data Source
AI summary
A needle system (10) for injection and aspiration of fluids through a subcutaneous venous port (1) comprises a main body (120) comprising a cavity (121), a conduit (101) with a proximal (211) and distal end (212), a needle section (102) with a proximal (221) and distal end (222), the distal end having an opening (203). The system comprises a rod (103) with a proximal (231) and distal end (232) and a length that is greater than the length of the needle section. The rod comprises an elongated rod shaft portion (106) configured to fit inside the needle section and a rod tip portion (104), at the distal end of the rod. The system comprises a rod control assembly (130). The distal end of the conduit is arranged in the main body and open to the cavity. The proximal end of the needle section is connected to the main body and open to the cavity. The shaft portion is inside the needle section and the proximal end of the rod is attached to the rod control assembly. The rod control assembly is configured to shift the rod in the proximal and distal direction to put the system into a closed state and into an open state. The rod tip portion blocks the distal end opening of the needle section in the closed state, and the rod tip portion is shifted distally relative to the needle section and unblocks the distal end opening of the needle section in the open state, thereby allowing fluid to be injected and/or aspirated through the conduit and the needle section in the open state.