Injection Reservoir and Plunger Coupling for Precise Gas-Free Dosing
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Solution Overview
Problem
Existing medical liquid injection devices, particularly for diabetic patients, face challenges in precise injection control, wearability, convenience, durability, and safety, especially when used by patients themselves, with issues related to gas removal, foreign substance generation, and foreign substance contact.
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 for precise injection and reduced friction, along with a resistance member for improved safety and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guide groove is added to the reservoir inner surface for gas removal, then gas removal capability is improved, but device complexity increases
Solution Approach 1:
The guide groove is segmented into multiple sections: a first guide groove extending from the inlet end to a first position, and a second guide groove extending from the first position to the outlet end. This segmentation allows gas to be guided through distinct paths, improving gas removal capability while keeping the groove structure manageable and not excessively complex.
Solution Approach 2:
The guide groove acts as an intermediary structure between the inlet end and the outlet end, providing a dedicated path for gas to travel through the reservoir. This intermediary channel enables effective gas removal without requiring complex mechanical components, thus improving reliability while minimizing the increase in device complexity.
2Object-affected harmful factors
If a sealing member is added at the inlet end to prevent foreign substance entry, then safety is improved, but device complexity increases
Solution Approach 1:
The sealing member is designed as a simple, replaceable component that can be easily installed and removed. This disposable or replaceable sealing element provides effective foreign substance prevention while adding minimal complexity to the overall device, as it can be replaced rather than repaired if needed.
Solution Approach 2:
The sealing function is extracted as a separate, dedicated component (sealing member) positioned at the inlet end, rather than integrating it into the reservoir wall or other components. This extraction allows the sealing member to be optimized specifically for its function while keeping the rest of the device structure simple and manageable.
3Measurement precision
If a rod with screw threads is used to connect the plunger, then injection precision is improved, but manufacturing complexity increases
Solution Approach 1:
The rod is designed with screw threads only in the region where it needs to engage with the connecting member, rather than along its entire length. This localized threading provides the necessary injection precision through controlled engagement while simplifying manufacturing by reducing the amount of threaded material that needs to be produced and assembled.
Solution Approach 2:
The screw-threaded connection between the rod and connecting member creates a dynamic, adjustable connection that allows for precise control of plunger movement. The threaded interface enables fine-tuning of the injection mechanism while maintaining a relatively simple overall structure that can be manufactured using standard machining processes.
4Reliability
If a resistance member is added to the connecting member, then safety is improved, but device complexity increases
Solution Approach 1:
The resistance member is designed as a simple, replaceable component that can be easily installed and removed. This disposable or replaceable resistance element provides safety functionality while adding minimal complexity to the overall device, as it can be replaced rather than repaired if needed.
Solution Approach 2:
The resistance function is extracted as a separate, dedicated component (resistance member) positioned within the connecting member, rather than integrating it into the rod or other components. This extraction allows the resistance member to be optimized specifically for its safety function while keeping the rest of the device structure simple and manageable.
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 and safe injection of medical liquids, minimizes foreign substance contact, accurately discharges a fixed amount, and quickly injects medical liquids without delay, enhancing user safety and convenience.
Implementation Method 1
a guide groove on an inner surface of the reservoir, the guide groove extending from the inlet end to the outlet end
Implementation Method 2
a sealing member attached to the inlet end of the reservoir
Implementation Method 3
a rod connected to the plunger and including a male screw having a first screw thread and a first screw groove on an outer circumferential surface, and a connecting member including a female screw having a second screw thread
Implementation Method 4
a resistance member inserted into the connecting member and disposed between the reservoir and the drive wheel
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.