Filter Needle with Movable Plunger for Dual-Mode Fluid Handling
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Solution Overview
Problem
Current filter needles require needle replacement during injection, leading to cumbersome procedures, increased medical waste, and potential adverse effects from foreign substances in medical fluids, which hinders quick emergency treatments and increases processing costs.
Innovation Solution
A filter needle design with an outer housing and a filtering unit that includes an inner housing, an opening/closing member, a filter, and a coupling member, allowing for complete filtration of foreign substances during fluid filling and injection without needle replacement, using a luer lock for compatibility with various syringes and a cone-shaped rubber opening/closing member for effective fluid passage and filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is installed in a needle fixing member to filter foreign substances during syringe filling, then foreign substances are filtered, but the filter must be replaced or the needle must be replaced before injection, increasing procedure complexity and medical waste
Solution Approach 1:
The invention employs a movable plunger that can switch between a first position (for filling with filtration) and a second position (for injection without filtration). This dynamic repositioning allows the same needle assembly to serve dual purposes: filtering foreign substances during filling while enabling direct injection afterward, thereby eliminating the need for needle replacement and simplifying the overall procedure
Solution Approach 2:
The needle assembly is segmented into distinct functional zones: a filling portion with filtration capability and an injection portion without filtration. The plunger divides the internal space into a filling chamber and an injection chamber, allowing independent operation of filling and injection functions. This segmentation enables the system to perform both filtered filling and unfiltered injection through the same needle assembly
2Object-affected harmful factors
If needle replacement is required after filtration to ensure patient safety, then foreign substances are prevented from entering patient, but treatment time increases and medical waste increases
Solution Approach 1:
The movable plunger dynamically transitions between filling and injection positions, allowing the system to maintain continuous operation without needle replacement. During injection, the plunger moves to the second position, directing fluid flow away from the filtration area, ensuring patient safety while eliminating time-consuming needle replacement steps
Solution Approach 2:
The invention recovers the needle assembly for continued use after the filling operation. Instead of discarding or replacing the needle after filtration, the system retains the same needle assembly for injection, thereby reducing medical waste and eliminating the time loss associated with needle replacement while maintaining patient safety
3Reliability
If multiple disposable syringes and needles are used for filling and injection, then patient safety is maintained, but medical waste increases and processing costs increase
Solution Approach 1:
The invention merges the filling needle and injection needle into a single integrated needle assembly. The needle assembly includes both a filling portion with filtration and an injection portion, allowing both operations to be performed with one needle. This merging reduces the number of disposable needles required while maintaining patient safety through the filtration function during filling
Solution Approach 2:
The needle assembly is designed with multi-functionality, serving both as a filtration device during filling and as an injection device afterward. The same needle assembly performs multiple functions: filtering foreign substances during filling, injecting the filled solution into the patient, and preventing foreign substance entry during injection. This universality reduces medical waste and processing costs while maintaining patient safety
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
Enables safe and convenient injection of filtered medical fluids without needle replacement, reducing medical waste and processing costs, facilitating quick emergency treatments by ensuring foreign substances are filtered out during the injection process.
Implementation Method 1
a filter disposed at a rear end portion of the opening/closing member to filter a medical fluid
Implementation Method 2
an opening/closing member which is coupled to an inner portion of the inner housing and comprises an opening/closing part having an opening/closing hole extending to a front end portion of the inner housing and opening/closing an opening portion of the outer housing
Data Source
AI summary
The present relates to a filter needle coupled between a fixation member having a needle for injecting a medical fluid after filtering foreign substances contained in the medical fluid and a disposable syringe, the filter needle includes an outer housing having a front end portion to which the fixation member is coupled and a rear end portion to which the disposable syringe is coupled and a filtering unit which is disposed inside the outer housing, and in which a medical fluid supplied from the fixation member to the disposable syringe is passed through as is, while a medical fluid supplied from the disposable syringe to the fixation member is filtered.