Mobile Torus Exsanguination Device for Limb Blood Displacement
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Solution Overview
Problem
Current methods for exsanguinating an extremity during surgical procedures often result in residual blood obstructing the surgical site, despite the use of elastic bandages and pneumatic tourniquets, due to incomplete blood displacement and pressure variability along the extremity.
Innovation Solution
A mobile torus device with a variable circumferential diameter, equipped with a transducer to control pressure and tension, which moves along the extremity using wheels and a pulling handle, applying constant exsanguination pressure through adjustable fibers and mechanisms like springs and inflatable ballast to maintain bloodlessness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a pneumatic tourniquet is inflated to high pressure (150-500 mm Hg) to prevent blood flow during surgery, then bloodless surgical site is achieved, but residual blood remains in the extremity distal to the tourniquet which obstructs visualization after incision
Solution Approach 1:
The mobile torus device is moved along the extremity before surgical incision to progressively displace blood proximally. The torus applies controlled pressure and is advanced in stages, pushing blood toward the tourniquet before the actual surgical procedure begins, thereby preventing residual blood from obstructing the surgical site after incision.
Solution Approach 2:
The device employs a mobile, adjustable torus that can be dynamically repositioned along the extremity. The torus diameter and pressure are variable, allowing adaptation to different anatomical locations and blood volumes. The transducer continuously monitors and adjusts pressure to maintain optimal exsanguination while moving the device proximally.
2Object-affected harmful factors
If elastic bandage is wrapped in spiral fashion to exsanguinate the extremity, then some blood is driven proximal to surgical site, but pressure is not uniformly distributed and residual blood remains
Solution Approach 1:
The torus device provides localized, circumferential pressure distribution around the extremity. Unlike linear elastic bandaging, the torus encircles the limb completely, ensuring uniform pressure at each cross-section. The pressure is applied locally at the torus-extremity interface while maintaining consistency around the entire circumference.
Solution Approach 2:
The device dynamically adjusts pressure parameters using a transducer that monitors and modifies the force applied by the torus. The pressure magnitude and torus diameter are variable parameters that can be changed in response to real-time feedback, ensuring optimal and uniform pressure distribution throughout the exsanguination process.
3Object-affected harmful factors
If Lavage and copious sponging are used to render surgical site bloodless, then residual blood is removed from surface, but surgical site becomes wet and visualization is compromised
Solution Approach 1:
The mobile torus device performs exsanguination before surgical incision and before any lavage or sponging is performed. By displacing blood proximally in advance, the device prevents blood from reaching the surgical site in the first place, eliminating the need for subsequent lavage and sponging that would wet the surgical field and compromise visualization.
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 mobile torus effectively displaces blood proximally, maintaining a bloodless surgical site by adjusting pressure and diameter according to the extremity's thickness, ensuring clear visualization and efficient surgical conditions.
Implementation Method 1
a transducer operatively associated with the torus, the transducer, while the torus is encircling the extremity portion, being configured to control at least one of a diameter of the variable circumferential diameter, a tension in the torus and a pressure applied by the torus
Implementation Method 2
the torus includes at least one wheel located around a cross sectional section of an annular portion of the torus, the at least one wheel and configured to roll along the extremity portion as the torus is moved
Implementation Method 3
the transducer comprises at least two bands of fibers at least partially encircling the torus, the at least two bands of fibers including at least one first band of fibers having a first rate of elasticity, and at least one second band of fibers having a second rate of elasticity
Implementation Method 4
the transducer includes at least one of at least one variably extendable tension band, at least one variably inflatable ballast, at least one spring, at least one hydraulic piston and at least two sections of a diaphragm
Implementation Method 5
the transducer includes at least one of at least one variably extendable tension band, at least one variably inflatable ballast, at least one spring, at least one hydraulic piston and at least two sections of a diaphragm
Data Source
AI summary
Disclosed is a device for exsanguinating a portion of an extremity, the device comprising a torus having a variable circumferential diameter, the torus configured to encircle an extremity portion and apply exsanguination pressure thereto, and a transducer operatively associated with the torus, the transducer, while the torus is encircling the extremity portion, being configured to control at least one of a diameter of the variable circumferential diameter, a tension in the torus and a pressure applied by the torus.