Syringe With Bypass Suction Flow Passage
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Solution Overview
Problem
Conventional syringes require excessive force or time to suck liquid medicine due to vacuum states caused by small injection needles, especially when filters are used, leading to user inconvenience and potential incomplete suction.
Innovation Solution
A syringe design featuring a separate suction flow passage bypassing the injection needle, with a valve mechanism that allows user-controlled opening and closing of the suction flow passage, enabling smoother and more efficient liquid medicine suction without relying on the injection needle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a small diameter injection needle is used, then injection precision is improved, but suction of liquid medicine becomes difficult requiring large force or long time
Solution Approach 1:
The flow passage is segmented into two separate paths: an injection flow passage through the injection needle for precise injection, and a separate suction flow passage bypassing the needle for easy suction. This segmentation allows each passage to be optimized for its specific function without compromise.
Solution Approach 2:
A valve mechanism acts as an intermediary to control which flow passage is active. The valve switches between the injection flow passage and the suction flow passage, enabling the system to use the appropriate path for each operation (suction or injection) without manual needle changes.
2Reliability
If a filter is added to filter foreign substances, then safety is improved, but suction difficulty increases due to vacuum state
Solution Approach 1:
The filter is placed specifically in the suction flow passage to filter foreign substances during suction operations. The injection flow passage remains separate and filter-free, ensuring smooth injection flow while maintaining safety during suction.
Solution Approach 2:
The valve mechanism mediates between the filtered suction path and the unfiltered injection path, directing liquid medicine through the appropriate path based on the operation type, thus maintaining both safety and operational ease.
3Device complexity
If the injection flow passage is used for suction, then device simplicity is maintained, but suction efficiency decreases requiring excessive force
Solution Approach 1:
The device is segmented into two functional flow passages: one optimized for injection (through the needle) and one optimized for suction (bypassing the needle with larger diameter). This segmentation resolves the conflict between simplicity and efficiency by adding a dedicated suction path.
Solution Approach 2:
The system dynamically switches between two flow passages based on the operation mode (suction or injection) using a valve mechanism. This dynamic switching allows the system to optimize performance for each specific task rather than compromising both functions in a single passage.
4Ease of operation
If the plunger is released before suction completion, then user convenience is improved, but the plunger advances automatically due to negative pressure causing incomplete suction
Solution Approach 1:
The valve mechanism acts as an intermediary that controls the flow path. When switched to the injection flow passage mode, it prevents negative pressure from pulling the plunger forward, allowing users to release the plunger safely without risking incomplete suction or accidental injection.
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 design allows for easier and quicker suction of liquid medicine with reduced force, enhancing user convenience and product marketability by allowing forcible closure of the suction flow passage during injection.
Implementation Method 1
a suction flow passage formed from a pointed hollow cap to the cylinder and provided with a through-hole formed in any one of the injection needle, a connector for connecting the injection needle to the cylinder, and the cylinder to establish communication between an inside and an outside thereof
Implementation Method 2
a valve means for intermittently controlling opening or closing of the suction flow passage by a user's manipulation
Implementation Method 3
As the plunger is moved forward, the injection liquid in the cylinder 20 is discharged through the injection needle by a positive pressure and then injected into a patient's body
Implementation Method 4
as the plunger 30 is retreated, a negative pressure is generated in the cylinder 20 and the cylinder is then filled with the injection liquid
Data Source
AI summary
The present invention relates to a syringe, and more particularly, to an apparatus obtained by improving a conventional syringe formed with an injection flow passage including an injection needle, so as to share a portion of the injection flow passage except the injection needle or to form a suction flow passage completely independent of the injection flow passage, thereby further smoothing suction of a liquid medicine. The syringe is configured such that the separate suction flow passage bypassing the injection needle is formed in the conventional syringe to more smoothly perform suction of the liquid medicine, thereby maximizing user's convenience and marketability of the conventional syringe, and further configured to forcibly close the suction flow passage upon injection of the liquid medicine.