Medical Syringe Plunger Protrusions Prevent Suction
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Solution Overview
Problem
Existing medical syringes used for removing thrombi from blood vessels are prone to medical malpractice due to excessive pressure risks and are often bulky and expensive, with plungers being sucked into the cylinder due to pressure differences.
Innovation Solution
A medical syringe design featuring a plunger with protrusions arranged along its longitudinal direction, which selectively overlap with a stopper to prevent suction into the cylinder, allowing for controlled thrombi extraction and pressure measurement without a large suction device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pump device is used to remove thrombi, then thrombi can be suctioned out, but the blood vessel may be damaged by excessive pressure and the device is bulky and expensive
Solution Approach 1:
The patent employs a disposable syringe instead of an expensive, bulky pump device. The syringe is a simple, single-use medical instrument that can be discarded after one use, eliminating the need for costly equipment while maintaining effective thrombi removal capability through manual plunger operation.
2Device complexity
If a syringe is used to remove thrombi, then the device is simple and portable, but the plunger may be sucked into the cylinder causing medical malpractice
Solution Approach 1:
The patent applies preliminary anti-action by pre-equipping the plunger with protrusions that will engage with the stopper before suction occurs. When the plunger is pulled back to create negative pressure for thrombi suction, the protrusions automatically engage with the stopper to prevent the plunger from being sucked into the cylinder, thus preventing medical malpractice before it can happen.
Solution Approach 2:
The protrusions on the plunger act as an intermediary mechanical element between the plunger body and the stopper. These protrusions engage with the stopper to transmit and balance the pressure force, preventing the plunger from being completely sucked into the cylinder while still allowing controlled movement for thrombi removal.
3Productivity
If the plunger is pulled back to create negative pressure for thrombi suction, then thrombi can be removed, but the plunger may be completely sucked into the cylinder
Solution Approach 1:
The protrusions are pre-configured on the plunger to engage with the stopper during suction operation. This preliminary anti-action ensures that when negative pressure is created for efficient thrombi suction, the plunger cannot be completely sucked into the cylinder, maintaining both productivity and operational control.
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 prevents plunger suction into the cylinder, facilitating safe and efficient thrombi removal, reducing medical malpractice risks, and enabling easy pressure measurement within the blood vessel.
Implementation Method 1
the plunger is sucked into a cylinder by a pressure difference such that medical malpractice may occur
Data Source
AI summary
The present invention may provide a medical syringe comprising: a cylinder including a stopper protruding inward; and a plunger disposed inside the cylinder so as to move back and forth in a first direction, wherein the plunger includes a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the longitudinal direction of the plunger, and based on the first direction, any one of the stopper or the plurality of protrusions is arranged so as to be selectively overlapped according to the rotation of the plunger.