Filter Syringe With Segmented Flow Path For Micro-Pore Filtration
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Solution Overview
Problem
Conventional filtering syringes face challenges in preventing foreign substances like glass fragments from being injected with the liquid medicine, especially when using filters with micro-pores, as they require significant force to suck the liquid and may not allow smooth injection due to the filter's resistance.
Innovation Solution
The filtering syringe design includes a separate injection flow passage with a filter means that prevents foreign substances from entering the body by forming a distinct flow passage from the filter to the injection needle, allowing for easy suction and injection with reduced force by using a one-way valve mechanism that opens during suction and closes during injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter means having micro-pores is employed to prevent foreign substances from being injected, then the reliability of preventing foreign substance injection is improved, but the ease of operation deteriorates because a relatively large force is required for sucking the injection liquid
Solution Approach 1:
The syringe is divided into two separate flow passages: a suction flow passage that bypasses the filter during liquid intake, and an injection flow passage that routes liquid through the filter during injection. This segmentation allows the filter to be engaged only when needed for safety, while suction operations remain unrestricted and easy to perform.
2Reliability
If a filter means having micro-pores is employed to prevent foreign substances from being injected, then the reliability of preventing foreign substance injection is improved, but the productivity deteriorates because the liquid medicine may not pass through the filter smoothly
Solution Approach 1:
The syringe is divided into two separate flow passages: a suction flow passage that bypasses the filter during liquid intake, and an injection flow passage that routes liquid through the filter during injection. This segmentation allows the filter to be engaged only when needed for safety, while suction operations remain unrestricted and easy to perform.
3Reliability
If a filter is provided in the injection needle or cylinder to filter foreign substances, then the reliability of preventing foreign substance injection is improved, but the device complexity increases due to additional filter components
Solution Approach 1:
The filter means is integrated into the hub of the injection needle, serving dual purposes: filtering foreign substances during injection while also maintaining the structural integrity and sealing of the needle assembly. This multi-functional integration eliminates the need for separate filter components, reducing overall device complexity.
Solution Approach 2:
The filter means is merged with the hub structure of the injection needle, combining the filtering function with the existing mechanical components. This integration eliminates separate filter assemblies and reduces the number of parts, thereby simplifying the overall device structure while maintaining reliable foreign substance prevention.
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
This design effectively prevents foreign substances from being injected while allowing smooth suction and injection, even with filters having micro-pores, enhancing user convenience and marketability by reducing the force required for suction and ensuring efficient injection.
Implementation Method 1
a one-way valve means (300) which allows the liquid medicine to flow from the suction flow passage to the cylinder (20) but prevents the liquid medicine from flowing in the reverse direction
Implementation Method 2
a filter means (200) provided in an injection flow passage to prevent the foreign substances from being injected together with the liquid medicine
Implementation Method 3
as the plunger 30 is retreated, a negative pressure is generated in the cylinder 20 and the cylinder is then filled with an injection liquid
Implementation Method 4
As the plunger is moved forward, the injection liquid in the cylinder 20 is discharged through the injection needle by a positive pressure
Data Source
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Figure 5
AI summary
The present invention relates to a filtering syringe, and more particularly, to an apparatus obtained by improving a syringe provided with a filter means for filtering foreign substances such as glass fragments of an ampoule, so as to prevent the foreign substances from being injected together with a liquid medicine while allowing the liquid medicine to be smoothly sucked and injected with a small force, especially even though a filter means having micro-pores is employed. The filtering syringe includes an injection needle (10), a cylinder (20) and a plunger (30) and further includes a suction flow passage formed from a pointed hollow cap (100) to the cylinder (20) and provided with a one-way valve means (300); and an injection flow passage formed from the cylinder (20) to the injection needle (10) and provided with a detachable opening/closing means (400) for selectively opening and closing the injection needle (10) and a filter means (200) for filtering out foreign substances from a liquid medicine, wherein the injection flow passage and the suction flow passage share portions of the flow passages or the injection flow passage is formed independently of the suction flow passage, whereby a flow passage portion from the filter means (200) to the injection needle (10) in the injection flow passage is formed independently of the suction flow passage. The filtering syringe is configured such that the filter means is provided in the injection flow passage to prevent the foreign substances from being injected together with the liquid medicine while enabling the liquid medicine to be more smoothly sucked and injected despite employing the filter means having the micro-pores, thereby maximizing user's convenience and marketability of the syringe.