Disposable Arrow Wipe with pH Indicator for Shot Assessment
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Solution Overview
Problem
Archery hunters face challenges in determining the accuracy of their shots due to the high velocity of arrows or bolts, which often results in difficult-to-observe impacts, leading to potential non-lethal quartering shots, especially when animals move before being hit, making it hard to assess if the projectile passed through vital organs or the digestive tract.
Innovation Solution
A disposable wipe with a chemically reactive substrate and indicator materials that change color upon contact with bodily fluids, allowing hunters to determine the type of shot by pH changes, enabling immediate identification of whether the arrow passed through lungs or the digestive tract, and also serving as a cleaning tool for the arrow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hunters observe the arrow during flight to determine shot accuracy, then shot placement precision can be improved, but the high velocity of the arrow (400 fps) makes observation extremely difficult
Solution Approach 1:
The chemical indicator is applied to the arrow shaft before hunting, so that the detection function is prepared in advance. When the arrow contacts bodily fluids during flight or immediately after impact, the indicator automatically reacts and changes color, eliminating the need for hunters to observe the fast-moving arrow during flight.
2Loss of information
If hunters examine the arrow after recovery to determine shot accuracy, then information about shot placement can be obtained, but this delays the ability to make informed tracking decisions
Solution Approach 1:
The chemical indicator provides immediate visual feedback about shot placement by changing color when exposed to different bodily fluids. This feedback mechanism allows hunters to quickly assess whether they achieved a lethal shot (lung contact showing neutral pH) or a non-lethal gut shot (stomach acid contact showing acidic pH), enabling timely tracking decisions without delay.
Solution Approach 2:
The indicator material changes color based on pH levels encountered during the shot. Neutral pH from blood indicates a lung shot, while acidic pH from stomach fluids indicates a gut shot. This color change mechanism provides instant, easy-to-interpret information about shot placement and quality.
3Measurement precision
If multiple indicator materials are applied to detect different bodily fluids, then measurement precision of shot placement is improved, but device complexity increases
Solution Approach 1:
The indicator system uses asymmetric chemical sensitivity, where different indicator materials are strategically placed or combined to detect specific pH ranges. The first indicator material detects neutral pH (blood/lung fluids) while the second detects acidic pH (stomach/gut fluids), creating a differentiated detection system that is simple yet precise.
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
Provides a simple, effective, and immediate method for hunters to assess the accuracy of their shots, allowing for appropriate tracking and humane treatment of wounded animals by distinguishing between lethal and non-lethal hits, thereby improving shot placement and hunting practices.
Implementation Method 1
A variety of chemical compounds are known to exhibit color changes upon contact with fluids of various pH, specifically including color changes when contacting acidic fluids.
Data Source
AI summary
A disposable indicator for use with an arrow or crossbow bolt comprising a substrate and a chemical indicator material capable of detecting and visually indicating chemical properties of a bodily fluid wiped from the arrow by a change in color. Chemical indicating materials may be selected to indicates a variety of bodily fluid chemical properties using pH, enzyme, or detection of other bodily compounds. The indicator provides an immediate indication of the portions of the animal's body through which the arrow or bolt passed, enabling the hunter to determine the type of shot and how best to track the wounded animal. An additional benefit is that the substrate can be used to clean the arrow or bolt in additional to providing a chemical shot indication.