Puncture Assisting Device for Self-Administered Elbow Joint Injection
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Solution Overview
Problem
Subcutaneous injection of drugs into the elbow joint stretching portion at the elbow is challenging due to the inability to self-administer the injection without manual dexterity, as the site requires one-handed operation and can cause pain and nerve pressure.
Innovation Solution
A puncture assisting device with plate-like pinching portions, a biasing mechanism, and a rod insertion portion that widens the gap between pinching portions, allowing for easy and safe subcutaneous injection by stabilizing the skin and guiding the needle for self-administration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If subcutaneous injection is performed at traditional sites (upper arm, abdomen, thigh, hip), then the injection can be easily administered with two-handed operation, but the skin cannot stretch enough to accommodate large drug amounts and causes severe pain due to nerve pressure
Solution Approach 1:
The puncture assisting device acts as an intermediary tool that enables self-administration at the elbow joint stretching portion. The device includes a holding portion that secures the skin, a guide portion that directs the needle, and a rod insertion portion that allows gap adjustment, thereby mediating between the user's limited dexterity and the requirements for pain-free large-volume injection
2Object-affected harmful factors
If subcutaneous injection is performed at the elbow joint stretching portion, then large drug amounts can be injected without pain due to skin stretchability, but the site cannot be touched by the same side hand requiring one-handed operation
Solution Approach 1:
The puncture assisting device is segmented into distinct functional portions: a holding portion for skin stabilization, a guide portion for needle direction, and a rod insertion portion for gap adjustment. This segmentation allows each component to perform its specific function, enabling complex one-handed operation for self-administration at the elbow joint stretching portion
3Measurement precision
If the pinching portions are kept closed to stabilize the skin, then injection accuracy is improved, but the gap between pinching portions is insufficient for needle insertion and device operation
Solution Approach 1:
The gap between the pinching portions is made dynamic rather than fixed. The rod insertion portion allows the gap to be adjusted based on operational needs: kept small for stable skin holding during injection, and widened by rod insertion for needle access and device manipulation. This dynamic adjustment resolves the contradiction between accuracy and accessibility
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
Enables easy, safe, and pain-free subcutaneous injection of a large drug amount into the elbow joint stretching portion, reducing the frequency of outpatient or inpatient treatments and minimizing nerve pressure.
Implementation Method 1
a biasing portion that biases the pair of pinching portions to be in a closed position
Data Source
AI summary
A puncture assisting device includes a pair of plate-like pinching portions that face each other, and that are attached to each other so as to be openable and closeable; a biasing portion that biases the pair of pinching portions to be in a closed position; a pair of gripping portions configured to operate the pair of pinching portions to be in an open position; and a rod insertion portion that is disposed between the pair of pinching portions, the rod insertion portion being configured such that a rod portion of a syringe is insertable into the rod insertion portion to widen a gap between the pair of pinching portions.