Syringe Dose Adjustment via Rotating Push Rod and Screw Mechanism
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Solution Overview
Problem
Conventional syringes lack the ability to adjust the injection dose according to the needs of different injection objects, making them inadequate for varied medical applications.
Innovation Solution
A syringe with an injection dose adjustment function, featuring a medicine vial connecting apparatus and an adjustable propulsion apparatus, which includes a rotating knob, zeroing nut base, screw rod, and push rod, allowing for precise adjustment of the injection dose through a combined structure that enables the syringe to output a predetermined dose of medicament liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional metered syringe uses a push rod to push a piston in the medicine vial to move a certain distance through a linkage control of an internal driving mechanism, then a predetermined dose of medicament liquid can be output, but the injection dose cannot be adjusted according to the needs of different injection objects
Solution Approach 1:
The syringe employs a rotatable push rod that can be manually rotated by the user to adjust the injection dose dynamically. The push rod features a threaded portion that engages with the piston rod, allowing rotational movement to be converted into linear displacement adjustment. This dynamic adjustment mechanism enables the syringe to adapt to different injection dose requirements while maintaining precise measurement through the threaded engagement.
2Device complexity
If a conventional syringe has a fixed linkage control mechanism, then the structure is simple, but it lacks the function of adjusting the injection dose
Solution Approach 1:
The linkage control mechanism is segmented into separate functional components: a push rod with a threaded portion, a piston rod with a corresponding threaded engagement, and a ratchet mechanism. This segmentation allows the push rod to be rotated independently for dose adjustment while maintaining the structural integrity of the overall system. The segmented design enables dose adjustment functionality without requiring complete redesign of the linkage control mechanism.
3Adaptability or versatility
If a syringe adds an adjustable propulsion apparatus with rotating knob, zeroing nut base, screw rod, and push rod, then injection dose adjustment capability is achieved, but the device complexity increases
Solution Approach 1:
The adjustable propulsion apparatus merges multiple functions into integrated components. The push rod combines linear movement for piston actuation with rotational capability for dose adjustment through its threaded portion. The zeroing nut base integrates with the housing to provide both structural support and dose resetting functionality. The ratchet mechanism is incorporated into the push rod assembly to prevent reverse movement. This merging of functions reduces the number of separate components needed while achieving dose adjustment capability.
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 can accurately adjust the injection dose to meet the needs of different users by utilizing the rotating knob to drive the push rod and screw rod, ensuring precise delivery of medicament liquid, and includes a resetting mechanism for initial adjustment, enhancing user flexibility and accuracy.
Implementation Method 1
a threaded portion formed on an inner wall of the push rod hole, the screw rod assembled in the push rod hole of the push rod, the threaded portion of the push rod threaded with the spiral grooves of the screw rod
Data Source
AI summary
A syringe with an injection dose adjustment function, the syringe comprising a medicine vial connecting apparatus and an adjustable propulsion apparatus; by means of assembling the medicine vial connecting apparatus and a medicine vial, and then installing the adjustable propulsion apparatus in the medicine vial connecting apparatus and extending the adjustable propulsion apparatus into the medicine vial, a rotating knob of the medicine vial connecting apparatus can drive a push rod of the adjustable propulsion apparatus to move backward to a predetermined scale; at a time of injection, pressing the push rod enables the medicine vial to output a predetermined dosage of medicinal liquid, such that the syringe can adjust the dosage of the injection according to requirements of different injection subjects.