V-Shape Blade Amputation System for Rapid Field Severance
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Solution Overview
Problem
Current field-based amputation methods are slow and traumatic, often requiring 10-40 minutes and resulting in additional blood loss due to the use of rudimentary tools like handsaws or wire saws, which increase the time to critical care and complicate emergency limb severance in battlefield situations.
Innovation Solution
An amputation system featuring a cutting element with a V-shaped blade and a drive rod propelled by an energetic energy source at high velocity (300-1000 feet per second) to quickly and cleanly sever damaged limbs, utilizing a medical-grade material cutting blade and support structure for efficient tissue cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rudimentary handsaws or wire saws are used for field amputations, then the equipment is simple and portable, but the procedure time increases to 10-40 minutes and blood loss increases
Solution Approach 1:
The patent replaces the manual mechanical cutting system (handsaw, wire saw) with an automated high-velocity rod propulsion system. The rod is accelerated to high velocity by an energetic energy source and propels the cutting element through the tissue, eliminating the need for manual sawing motions and significantly reducing procedure time.
Solution Approach 2:
The patent changes the cutting mechanism from low-speed manual sawing to high-speed rod-propelled cutting. The rod velocity parameter is increased to hundreds of feet per second, and the cutting element geometry is optimized with specific V-shaped angles (90-120 degrees) to achieve rapid tissue severance while minimizing procedure time and blood loss.
2Ease of operation
If manual sawing is used for amputation, then the device complexity is low, but the trauma to the patient increases due to prolonged procedure time
Solution Approach 1:
The patent extracts the cutting function from the manual sawing process and isolates it in a dedicated high-velocity rod propulsion system. The cutting element is separated from the energy source, with the rod serving as the transmission medium, allowing the cutting action to be performed rapidly and cleanly with minimal trauma.
Solution Approach 2:
The patent introduces dynamic elements to the cutting system, including the high-velocity moving rod, the V-shaped cutting element geometry, and the controlled deployment mechanism. These dynamic features enable the cutting element to rapidly traverse the tissue and complete the amputation in seconds rather than minutes, reducing patient trauma and blood loss.
3Speed
If high-velocity rod propulsion is used, then amputation speed increases to 300-1000 feet per second, but the device complexity and energy source requirements increase
Solution Approach 1:
The patent employs a nested structure where the rod is contained within a barrel, the cutting element is attached to the rod, and the energetic energy source is positioned within the barrel adjacent to the rod. This nested arrangement compactly integrates the high-velocity propulsion system while maintaining portability and reducing overall device complexity.
Solution Approach 2:
The energetic energy source is designed to be self-contained and self-activating, requiring no external power supply or complex control systems. The system uses internal chemical or mechanical energy storage that automatically converts to kinetic energy of the rod, simplifying the overall device architecture while achieving the required high velocities.
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 system enables rapid and trauma-reducing amputations in field settings, ensuring quick severance and improved patient safety without the need for external power sources, reducing blood loss and time to critical care.
Implementation Method 1
An energetic energy source is positioned in the bore adjacent to the outboard end of the rod. The energetic energy source generates a pressure force that is incident on the outboard end of the rod. The pressure force is one that peaks within 0.5 milliseconds to propel the rod from the bore at a velocity in a range of 300 to 1000 feet per second.
Data Source
AI summary
An amputation system includes a cutting element having a cutting blade traversing a V-shape. The V-shape has a vertex and an angle in a range of 90-120°. A rod, rigidly coupled to the cutting element, has its longitudinal axis aligned with the vertex so it bisects the angle of the V-shape. A barrel having a bore receives at least a portion of the rod therein wherein the rod's outboard end resides in the bore. An energetic energy source, positioned in the bore adjacent to the rod's outboard end, generates a pressure force that is incident on the rod's outboard end. The pressure force is one that peaks within 0.5 milliseconds to propel the rod from the bore at a velocity in a range of 300 to 1000 feet per second.