Ulnar Compression for Radial Artery Patency During Catheterization

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Solution Overview

Problem

Radial artery occlusion is a common complication following transradial catheterization, leading to reduced blood flow and potential long-term access site closure, which existing methods struggle to prevent effectively.

Innovation Solution

The method involves compressing the un-instrumented ulnar artery to increase radial artery flow while applying pressure to the radial artery access site, using a device with an inflatable bladder to apply compressive force, and monitoring blood flow to confirm patency, thereby reducing the need for high doses of anticoagulants and minimizing occlusion risk.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high dose anticoagulants are used to prevent radial artery occlusion, then occlusion risk is reduced, but bleeding risk and hemostasis duration increase

Engineering Contradiction:

Improveradial artery patencyVSAvoidbleeding risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the dosing parameters of anticoagulants from conventional high doses to reduced doses, combined with timing the administration to coincide with ulnar artery compression. This parameter change allows prevention of radial artery occlusion while minimizing bleeding risk and reducing hemostasis duration.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies ulnar artery compression before and during anticoagulant administration to pre-establish increased radial artery flow. This preliminary action creates a protective effect that allows lower anticoagulant doses to be effective in preventing occlusion without proportionally increasing bleeding risk.

Inventive Principle:

Principle #10Preliminary action

2Object-generated harmful factors

If radial artery is compressed at access site to achieve hemostasis, then bleeding stops, but radial artery flow is reduced and occlusion risk increases

Engineering Contradiction:

Improvebleeding at access siteVSAvoidradial artery patency

Core Design Contradiction:

Object-generated harmful factorsVSReliability

Solution Approach 1:

The patent uses the ulnar artery as an intermediary to maintain radial artery patency. By compressing the ulnar artery, blood flow is redirected through the radial artery, maintaining its patency even while compression at the access site achieves hemostasis. The ulnar artery compression acts as a mediator that preserves radial flow despite radial compression.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies ulnar artery compression in advance of radial artery compression to pre-establish increased radial artery flow and collateral circulation. This preliminary anti-action counteracts the potential harmful effect of radial compression on artery patency before hemostasis compression is applied.

Inventive Principle:

Principle #9Preliminary anti-action

3Reliability

If radial artery flow is increased to maintain patency, then occlusion risk is reduced, but hemostasis duration is extended

Engineering Contradiction:

Improveradial artery patencyVSAvoidhemostasis duration

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent applies ulnar artery compression in periodic intervals rather than continuously, synchronized with anticoagulant administration. This periodic action maintains radial artery patency through intermittent flow enhancement while allowing hemostasis to proceed during compression periods, thereby reducing overall hemostasis duration.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies partial ulnar artery compression rather than complete occlusion, providing sufficient increase in radial artery flow to maintain patency and reduce occlusion risk, while not excessively extending hemostasis duration. The compression level is optimized to achieve the minimum necessary flow enhancement.

Inventive Principle:

Principle #16Partial or excessive action

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

This approach effectively maintains radial artery patency and reduces the occurrence of occlusion by increasing blood flow and velocity, allowing for lower anticoagulant doses and shorter hemostatic compression times, thereby enhancing patient comfort and procedural outcomes.

Implementation Method 1

compressing the un-instrumented ulnar artery to increase radial artery flow

Methodology Applied

Scientific EffectFluid flow redirection:

Implementation Method 2

applying pressure to the radial artery access site

Methodology Applied

Scientific EffectArterial compression: Compression

Data Source

PatentUS10722245B2Method to stop bleeding, with short hemostasis duration using a low dose of anticoagulant

Publication Date: 2020.07.28 VASOINNOVATIONS INC

AI summary

Disclosed is a method of reducing a dosage of an anticoagulant when performing a catheterization procedure at an access site of an artery. The method comprises administering the anticoagulant at a dose less than a conventional dose, reducing a contact time of blood at the access site of the artery, and maintaining the contact time of blood at a reduced level for a period of time during the catheterization procedure.