Projected Bloodstain Generator With Pressure and Direction Control
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Solution Overview
Problem
Existing methods lack a standardized device and method for experimentally generating projected bloodstains, which are crucial for determining the act of hitting in criminal cases, due to their morphological similarity with other scattered bloodstains.
Innovation Solution
A projected bloodstain generator comprising a blood supply, a blood vessel nozzle connector, and a blood vessel nozzle, with movable components for controlling blood ejection direction, and an input and control unit for user-defined operation, enabling the generation of projected bloodstains considering factors like blood vessel size and ejection pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a standardized device for generating projected bloodstains is introduced, then measurement precision and reliability of bloodstain analysis is improved, but device complexity increases
Solution Approach 1:
The device is divided into distinct functional modules: a blood supply unit with reservoir and pump, a positioning unit with movable stage and robotic arm, a blood vessel model unit with interchangeable nozzles, and a control unit. Each module independently performs its specific function, allowing the system to achieve high measurement precision through coordinated operation of specialized components while managing overall complexity through modular design.
2Adaptability or versatility
If the blood vessel nozzle connector is made movable to control blood ejection direction, then adaptability of the device to different bloodshed scenarios is improved, but device complexity increases
Solution Approach 1:
The blood vessel nozzle connector is designed with movable degrees of freedom, allowing it to dynamically adjust its position and orientation in three-dimensional space. The connector can rotate and translate to point the blood vessel nozzle toward different targets on the wall, enabling the device to adapt to various bloodshed scenarios including different angles, heights, and distances, while the motion is controlled through a automated positioning system rather than manual adjustment.
3Manufacturing precision
If the blood supply applies variable pressure to simulate different blood vessels, then manufacturing precision of bloodstain reproduction is improved, but device complexity increases
Solution Approach 1:
The blood supply system incorporates a pressure-controlled pump that can vary the pressure parameter to simulate different physiological conditions. By adjusting pressure, the system reproduces blood flow characteristics from different types of blood vessels (arteries, veins, capillaries) and different injury severities, enabling precise reproduction of various bloodstain patterns. The pressure control is integrated with the positioning and nozzle selection systems under unified control software.
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
Enables accurate reproduction and analysis of bloodshed scenes by generating projected bloodstains that mimic real-world conditions, aiding in the reconstruction of violent crime scenes.
Implementation Method 1
a blood supply capable of supplying blood by applying pressure
Data Source
AI summary
A projected bloodstain generator includes: a blood supply capable of supplying blood by applying pressure; a blood vessel nozzle connector that is connected to the blood supply to transfer the blood and change a position for controlling the direction of blood ejection; and a blood vessel nozzle having one end connected to the blood vessel nozzle connector and the other end configured to eject blood by applied pressure.