Topical Vasodilator and Anesthetic for Radial Artery Cannulation
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Solution Overview
Problem
Radial artery cannulation is challenging due to the small size of the radial artery, potential spasm, and pain during the procedure, which complicates access and increases the difficulty of inserting arterial lines.
Innovation Solution
A topical composition containing a vasodilation agent, such as nitroglycerin, and an anesthetic agent, like lidocaine, is applied to the skin site to increase arterial diameter and provide local anesthesia, reducing the risk of spasm and pain, facilitating easier cannula insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If radial artery cannulation is performed without topical treatment, then the procedure can be performed with minimal preparation, but the arterial diameter remains small and spasm occurs increasing difficulty
Solution Approach 1:
The patent applies topical vasodilator and anesthetic agents to the radial artery site before cannulation to preliminarily increase arterial diameter and reduce spasm risk, making the subsequent cannulation procedure easier and more successful
2Ease of operation
If multiple attempts are made to insert the arterial line, then access may eventually be achieved, but arterial spasm increases making the artery smaller and more difficult to access
Solution Approach 1:
The patent applies topical agents that preemptively counteract the spasm response before cannulation attempts begin, preventing the reflex vasoconstriction that normally occurs with multiple insertion attempts, thereby maintaining arterial diameter throughout the procedure
3Object-affected harmful factors
If local anesthesia is administered via injection, then pain control is effective, but the procedure becomes more invasive and complex
Solution Approach 1:
The patent replaces the mechanical injection method with topical application of anesthetic agents, eliminating needles and injection-related trauma while maintaining effective pain control through transdermal drug delivery
4Productivity
If the radial artery is cannulated for frequent procedures, then vascular access is readily available, but the small artery size and spasm potential make repeated cannulations increasingly difficult
Solution Approach 1:
The patent applies topical vasodilators and anesthetics before each cannulation attempt to preliminarily optimize arterial conditions, ensuring that even repeated procedures remain feasible by preventing spasm and maintaining diameter throughout multiple attempts
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 composition effectively increases radial artery diameter by 25% and provides significant local anesthesia, reducing pain and spasm, thereby simplifying the cannulation process without systemic effects on blood pressure.
Implementation Method 1
a vasodilation agent, such as nitroglycerin... effectively increases radial artery diameter by 25%
Implementation Method 2
an anesthetic agent, like lidocaine... provides significant local anesthesia, reducing pain and spasm
Data Source
AI summary
Provided are methods and compositions for locally increasing arterial diameter and providing local anesthesia in a subject. The methods include applying to a skin site of the subject a topical composition that includes a vasodilation agent and an anesthetic agent in a manner sufficient for locally increasing arterial diameter and providing local anesthesia in the subject. In some embodiments, the method includes inserting a cannula into an artery at the skin site of the subject. Also provided are topical compositions that find use in performing the subject methods.