Liquid Medicine Injection Device with Guide-Groove Gas Removal
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Solution Overview
Problem
Existing medical liquid injection devices, particularly for diabetic patients, face challenges in precise delivery, wearability, convenience, durability, and safety, especially when used by patients themselves, requiring improved control over small liquid injections and reduced contact with foreign substances.
Innovation Solution
A medical liquid injection device with a base body, needle assembly, reservoir, and driving unit, featuring a guide groove for gas removal, a sealing member, and a screw-coupled rod and connecting member design to minimize friction and ensure accurate, high-pressure delivery of medical liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a small medical liquid injection device is used to precisely inject small amounts of medical liquid, then injection precision is improved, but device complexity increases
Solution Approach 1:
The device is divided into distinct functional modules: a reservoir for storing medical liquid, a plunger for pushing the liquid, a rod connected to the plunger, a connecting member with screw threads, and a drive wheel. This segmentation allows each component to perform its specific function efficiently while maintaining overall precision.
Solution Approach 2:
The rod acts as an intermediary between the plunger and the connecting member, transmitting force while the screw threads provide a mechanical advantage. This intermediary mechanism enables precise control of small liquid volumes without requiring the entire device to be complex.
2Ease of operation
If the device is designed for wearability and direct attachment to patient skin, then ease of operation is improved, but safety risks increase due to potential contact with foreign substances
Solution Approach 1:
The needle assembly is designed as a separate, removable component that can be inserted into the reservoir. This extraction approach allows the needle to be sterilized independently and replaced if contaminated, while the main body remains attached to the patient's skin for ease of operation.
Solution Approach 2:
The reservoir creates a sealed environment that protects the medical liquid from foreign substances. The connecting member and rod operate within this protected space, minimizing exposure to contaminants while maintaining ease of operation through external controls.
3Manufacturing precision
If a screw-coupled rod and connecting member design is used to minimize friction, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The screw threads on the rod and connecting member create a self-locking mechanism that maintains precise positioning without requiring additional fastening components. The friction between the screw threads actually helps maintain precision by preventing backlash, while the standardized screw geometry simplifies manufacturing.
Solution Approach 2:
The connecting member integrates multiple functions: it connects the rod to the drive wheel, provides screw-threaded engagement for precise motion transmission, and serves as a structural support element. This merging reduces the number of separate components needed, offsetting the added complexity of the screw mechanism.
4Reliability
If the drive wheel is disposed apart from the reservoir to transmit driving force, then reliability is improved, but device complexity increases
Solution Approach 1:
The drive wheel is positioned in a different spatial dimension relative to the reservoir, connected through the rod and connecting member assembly. This dimensional separation allows the drive wheel to be operated externally while maintaining a reliable mechanical connection to the plunger system, distributing components to reduce local complexity.
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 device ensures precise injection, minimizes foreign substance contact, improves safety through gas removal and disinfection paths, and allows for quick, accurate delivery of a fixed amount of medical liquid with reduced power consumption.
Implementation Method 1
the rod contacts the female screw of the connecting member only in outer regions in a radial direction at the center of a height between the first screw thread and the first screw groove
Data Source
AI summary
A medical liquid injection device is provided. The medical liquid injection device includes a base body, a needle assembly mounted on the base body, a reservoir fluidly connected to the needle assembly and having a guide groove on an inner surface, and a driving unit configured to move a plunger disposed inside the reservoir.