Tourniquet Buckle Teeth and Windlass Tensioning
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Solution Overview
Problem
Existing tourniquets cause unnecessary injury due to uneven pressure distribution and high friction, leading to high localized pressure and shearing stresses, and are often bulky and heavy, making them impractical for emergency use.
Innovation Solution
A lightweight tourniquet design featuring an outer sleeve with a buckle and inner strap, where the buckle includes teeth to prevent disengagement and a windlass for tensioning, providing even radial compression to restrict blood flow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional tourniquet is used to stop blood loss, then blood flow restriction is achieved, but high localized pressure and shearing stresses cause unnecessary injury to soft tissue, nerves and muscles
Solution Approach 1:
The tourniquet strap is divided into multiple discrete segments or sections along its length. Each segment can independently contact the limb, distributing the compression force across multiple points rather than concentrating it in a single high-friction zone. This segmentation reduces localized pressure peaks and shearing stresses on soft tissues while maintaining overall blood flow restriction effectiveness.
Solution Approach 2:
The strap is designed with varying local properties - specifically, different friction characteristics at different locations. The portions of the strap that contact the limb are engineered to have reduced friction coefficients compared to traditional uniform straps. This local quality modification allows the strap to slide more freely over the skin, reducing shearing stresses and localized pressure injuries while still achieving the necessary overall compression for arterial occlusion.
2Reliability
If high strap tension is applied to reliably stop arterial blood flow, then blood flow restriction is achieved, but the friction between strap and limb increases, drawing soft tissue into the ratchet or buckle device
Solution Approach 1:
The strap incorporates sections with specifically engineered friction characteristics. The contact portions have reduced friction to allow smooth sliding over the limb surface, preventing tissue from being drawn into the buckle or ratchet mechanism. This local friction modification enables the strap to achieve high overall tension for reliable arterial occlusion without creating the high localized friction zones that cause tissue pinching and pressure injuries.
3Weight of moving object
If a lightweight tourniquet is designed for easy carrying, then portability is improved, but the structural complexity may be reduced, potentially affecting performance
Solution Approach 1:
The tourniquet utilizes flexible, thin strap material with engineered friction properties rather than bulky rigid structures. This allows the device to maintain very low weight and compact form factor for easy portability while the sophisticated friction characteristics of the flexible strap material ensure reliable blood flow restriction and reduced tissue injury. The thin-film approach eliminates the need for heavy protective housings or complex mechanical components.
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 tourniquet applies consistent pressure to restrict blood flow efficiently, reducing the risk of injury and being compact enough for easy carrying in emergency situations.
Implementation Method 1
The windlass applies tensile force to the inner strap, which applies a compressive force to the body part thus restricting the flow of blood in the body part
Implementation Method 2
The buckle includes teeth to prevent disengagement
Implementation Method 3
As the pressure on the limb increases, the friction between the strap and the limb also increases
Implementation Method 4
The tourniquet applies consistent pressure to restrict blood flow efficiently
Data Source
AI summary
A tourniquet for restricting a flow of blood in a body part comprises a first elongated member, and a second elongated member in slidable engagement with the first elongated member. In addition, the tourniquet includes a tensioning mechanism connected to the second elongated member, wherein a compressive force is applied to the body part upon applying a tensile force to the second elongated member using the tensioning mechanism. At least one embodiment of the present invention comprises a buckle having one or more of a raised intermediate bar and one or more teeth for contacting a portion of the first elongated member. The tourniquet is suited for emergency use, and may be applied by using only one hand. Thus, the tourniquet may be applied, manipulated and tightened by the wearer, even if the wearer is limited to the use of a single hand.