Disposable Self-Destructive Syringe Ratchet Mechanism
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Solution Overview
Problem
Existing disposable self-destructive syringes often fail to completely expel inhaled air and may leave medical liquid residues, limiting their single-use functionality and precision for administering high-dose medications like insulin and bacteria.
Innovation Solution
A disposable self-destructive syringe design featuring ratchet grooves on the injecting piston-rod, an anti-return member with ratchets and anti-return prods, and a reciprocal motion region allows for air expulsion and minimizes liquid residue by ensuring the piston-rod cannot be reused after a predetermined amount of medical liquid is injected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the syringe is designed with ratchet grooves and anti-return member to prevent reuse, then the single-use functionality is improved, but the ability to expel inhaled air and minimize liquid residue deteriorates
Solution Approach 1:
The patent introduces a dynamic reciprocal motion mechanism that allows the piston-rod to move backward and forward within a controlled range. The restrictive step and anti-return member work together to enable this dynamic motion for air expulsion while preventing complete removal or reuse, thus resolving the contradiction between single-use reliability and operational ease for air expulsion
2Reliability
If the anti-return member presses against the cylinder wall to prevent backward motion, then the disposable function is improved, but the precision for high-dose medication injection deteriorates
Solution Approach 1:
The patent applies local quality by creating a specific localized interaction zone between the anti-return prods and the restrictive step. This localized mechanical engagement provides precise control over piston-rod motion without requiring complex structures throughout the entire syringe, thereby maintaining injection precision while ensuring disposable functionality
3Reliability
If the ratchet grooves are arranged in the entire gap of the piston-rod, then the anti-return function is improved, but the complexity of the device structure increases
Solution Approach 1:
The patent extracts the anti-return function from the entire piston-rod structure and concentrates it in a specific localized area using the restrictive step and anti-return member assembly. This extraction simplifies the overall structure by eliminating the need for ratchet grooves throughout the entire piston-rod gap, reducing manufacturing complexity while maintaining reliable anti-return functionality
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 syringe effectively discharges inhaled air and ensures single-use functionality, reducing residue and enabling precise administration of medications by preventing backward motion of the piston-rod post-use.
Implementation Method 1
one or more ratchet grooves (4) are arranged on the front end of center gap in the injecting piston-rod; the anti-return member is provided with ratchets (9)
Implementation Method 2
In one embodiment, the anti-return member is made of spring steel sheet
Data Source
AI summary
The present invention discloses a disposable self-destructive syringe, which belongs to syringes for medical treatment, comprises a needle (1), a tube (2), a injecting piston-rod (3), ratchet grooves (4), a restrictive step (5), an installation opening (6), an anti-return member (7), anti-return prods (8), ratchets (9), a sealing plug (10) and a reciprocal motion region (11). The needle is conglutinated on the tube, the injecting piston-rod is arranged in the tube, the anti-return member is arranged in the gap of the injecting piston-rod and in the rear end of the tube, and the sealing plug is arranged in the tube and mounted on the front end of the injecting piston-rod. The syringe is convenient to discharge the inhaled air as sucking medical liquid, begins to be self-destructive after sucking for predetermined amount and can not suck medical liquid again during and after injecting. Furthermore, the ratchet grooves arranged on the injecting piston-rod can be one or more, which the fewer the number of ratchet grooves, the larger the interval of discharging inhaled air will become. The disposable self-destructive syringe according to the invention of which dose is precise is convenient to operate and will be self-destructive once used.