Torsion-Bar Tourniquet for Consistent Limb Pressure
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Solution Overview
Problem
Existing tourniquets are prone to failure, ineffective for lower extremities, and require fine motor skills for application, leading to inconsistent pressure and potential neurovascular damage, and are not suitable for field use due to design and cost constraints.
Innovation Solution
A pre-fabricated mechanical tourniquet with a torsion bar and slider mechanism, and a pneumatic tourniquet with a bladder and slider system, designed for one-handed operation, providing consistent circumferential pressure without requiring fine motor skills, suitable for various settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional tourniquets are applied with sufficient pressure to stop bleeding, then hemorrhage control is achieved, but neurovascular damage occurs due to excessive and inconsistent pressure
Solution Approach 1:
The patent applies parameter changes by transitioning from manual pressure application to a controlled mechanical expansion system. The inflatable cuff allows pressure to be precisely adjusted to the minimum level needed for hemorrhage control, eliminating excessive pressure that causes neurovascular damage while maintaining reliable bleeding control through systematic pressure application.
Solution Approach 2:
The patent utilizes pneumatics through the inflatable cuff system that applies circumferential pressure to the limb. This pneumatic mechanism provides uniform, controlled pressure distribution around the entire circumference of the limb, ensuring effective hemorrhage control without the localized excessive pressure that occurs with traditional manual tourniquet application.
2Ease of manufacture
If traditional tourniquets are made simple and inexpensive, then ease of manufacture is improved, but they become ineffective for lower extremities and prone to failure
Solution Approach 1:
The patent applies segmentation by dividing the tourniquet system into distinct functional components: an inflatable cuff for pressure application, a separate expansion mechanism, and a securing system. This segmentation allows each component to be optimized for its specific function while maintaining overall system reliability, particularly for lower extremity application where higher pressures are required.
Solution Approach 2:
The patent implements dynamics through the inflatable cuff system that can be expanded and adjusted to match the specific dimensions and pressure requirements of different limbs. This dynamic adjustment capability ensures effective hemorrhage control for various body parts including lower extremities, while the modular design keeps manufacturing relatively simple.
3Manufacturing precision
If tourniquets require fine motor skills for application, then precise pressure control is achieved, but operability during extreme duress is compromised
Solution Approach 1:
The patent applies self-service through the automatic expansion mechanism where the inflatable cuff self-regulates pressure application. Once activated, the system automatically inflates to the appropriate pressure level without requiring the user to perform fine motor adjustments, enabling effective hemorrhage control even when the user is experiencing extreme duress or injury.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the tourniquet with an automatic expansion mechanism and pre-positioned components. This allows the device to be rapidly deployed with minimal user input during critical moments, eliminating the need for fine motor skills during application while maintaining precise pressure control through the pre-engineered expansion system.
4Object-affected harmful factors
If pneumatic tourniquets are designed for consistent pressure application, then neurovascular damage is reduced, but device complexity and cost increase making field use impractical
Solution Approach 1:
The patent applies local quality by concentrating the complex pneumatic mechanism only where needed for pressure application, while other parts of the device remain simple and lightweight. The inflatable cuff and expansion mechanism are localized to the application site, allowing consistent pressure control to reduce neurovascular damage without making the entire device overly complex or expensive for field use.
Solution Approach 2:
The patent implements the disposable principle by designing the pneumatic tourniquet as a single-use device that can be rapidly deployed and then discarded. This approach justifies the inclusion of pneumatic components for consistent pressure application, as the device does not need to be durable or reusable. The complexity is accepted in exchange for reliable hemorrhage control, with the understanding that the device will be replaced rather than maintained.
Data Source
AI summary
A pre-fabricated tourniquet that is easy to apply, that ensures consistent and even circumferential pressure, that is lightweight, that provides standard life saving operation, and that can be utilized in any setting or situation, and related methods are provided. Mechanically constricting tourniquet apparatus and related methods are provided that are comprised of a tourniquet body, a carriage, a torsion bar, a receiver, and a slider. The tourniquet is long enough to encircle a human limb, for example, an arm or leg. The tourniquet apparatus includes several features for preventing or otherwise limiting harm to users and/or damage to the tourniquet apparatus itself.