Fish Dispatching Device Curved Spike Spinal Cord Alignment
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Solution Overview
Problem
Current methods for dispatching fish, such as ikejime, can be difficult for novice fishermen to execute properly, leading to inefficiencies and potential injury, especially when dealing with large fish, as they require precise alignment of a needle with the spinal cord, and existing methods like clubbing or icing cause fish to suffer and produce sour meat due to lactic acid and ammonia production.
Innovation Solution
A fish dispatching device with a curved spike and retractable wire mechanism, guided by markings for precise insertion and a control knob for aligning with the spinal cord, along with a knife sheath for bleeding, constructed from corrosion-resistant materials for ease of use and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ikejime process is used to quickly and humanely dispatch fish, then fish suffering is reduced and meat quality is preserved, but the device complexity and difficulty of operation increase due to the need for precise needle alignment with the spinal cord
Solution Approach 1:
The spike is pre-shaped with a curved profile that matches the natural curvature of the fish's spinal column. This preliminary shaping of the spike ensures that when inserted at the correct entry point, the curvature automatically guides the wire along the spinal cord path, eliminating the need for the operator to manually align a straight needle with the spinal cord during the procedure
Solution Approach 2:
The curved spike acts as an intermediary tool between the operator and the fish's spinal cord. Rather than directly inserting a needle into the spinal cord (which requires precise alignment), the curved spike first enters the fish, and its pre-formed curvature serves as a guide pathway that the wire then follows to reach the spinal cord, simplifying the alignment process
2Device complexity
If a straight needle is used for spinal cord insertion, then the device structure is simpler, but the manufacturing precision and alignment accuracy decrease making it difficult to properly dispatch large fish
Solution Approach 1:
The spike is designed with a curved profile rather than a straight shape. This curvature is specifically formed to match the natural arc of the fish's spinal column, allowing the spike to follow the anatomical pathway when inserted. The curved geometry compensates for the simplicity of the overall spike structure while achieving the precision needed for accurate spinal cord targeting in large fish
3Device complexity
If clubbing or icing methods are used to dispatch fish, then the equipment required is simpler, but the fish suffers longer and meat quality deteriorates due to lactic acid and ammonia production
Solution Approach 1:
The device combines multiple dispatching functions into a single integrated tool: the curved spike for initial brain death induction, the retractable wire for spinal cord targeting and muscle relaxation, and the knife sheath for subsequent bleeding. This merging of functions into one device achieves the rapid, humane dispatching效果 of complex procedures while maintaining relative simplicity compared to using multiple separate tools or methods
Data Source
AI summary
A fish dispatching device includes an elongated main body having a first end, a second end, and a hollow interior space. A spike having an opening along a sharpened tip extends outward from the first end of the main body, and an elongated wire is positioned within a continuous interior channel formed by the main body, the spike and the opening. A control knob is connected to the second end of the elongated wire and slides along the length of the main body to extend and retract the second end of the elongated wire through the opening in the spike. The control knob is connected to an elongated slit for cleaning the interior of the main body, and a knife is removably positioned within a sheath located along the second end of the main body.