Flexible Fish Holder With Abdomen Slit for Stable Injection
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Solution Overview
Problem
Existing test fish holders cause damage to test fish during handling and treatment, particularly when the fish violently act, and fail to maintain a stable posture for intraperitoneal administration without anesthesia, complicating experimental results.
Innovation Solution
A flexible holder with a holding groove and slit design that allows gentle fish retention, featuring a slit for abdomen exposure and side wing portions for adjustable grip, along with an injection needle guide for precise intraperitoneal administration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a flexible holder with sponge or nonwoven fabric is used to gently hold the test fish, then the test fish is held gently without burn symptoms, but when the test fish violently acts, strong force is inevitably applied causing damage to the test fish
Solution Approach 1:
The holder is divided into multiple functional regions: a holding groove for gentle containment, side wing portions for adjustable gripping force, and a bottom portion with a slit for abdomen exposure. This segmentation allows different parts to serve different purposes - the groove provides gentle holding while the side wings can apply stronger force when needed, resolving the contradiction between gentle holding and stable control during violent movement.
2Ease of operation
If anesthesia is performed on the test fish to prevent violent acting, then the test fish remains calm during handling, but it becomes unclear whether experimental results are affected by the target substance or the anesthesia, and repeated anesthesia prevents repeated administration experiments
Solution Approach 1:
The holder is designed with pre-formed structural features including the holding groove, side wing portions, and bottom slit configuration that are prepared in advance. These features enable the operator to perform intraperitoneal administration without anesthesia by providing natural restraint and proper positioning, thus eliminating the need for anesthesia while maintaining handling ease and ensuring accurate experimental results.
3Ease of operation
If the test fish is rotated around the front-rear axis to expose the abdomen for treatment, then the abdomen becomes accessible for intraperitoneal administration, but the test fish may be severely damaged during the rotation operation
Solution Approach 1:
Instead of rotating the test fish to expose the abdomen, the holder design inverts the approach by providing a slit in the bottom portion that opens toward the lower surface. This allows the abdomen to be exposed through the slit while the test fish remains in a stable, non-rotated position, eliminating the risk of damage during rotation operations while maintaining accessibility for intraperitoneal administration.
Data Source
AI summary
Provided is a technology which can properly perform a predetermined treatment on an abdomen of a test fish while reliably holding the test fish in a predetermined posture by suppressing damage as much as possible. A test fish holding device includes a flexible holder, the holder having a holding groove extending along a front-rear direction on an upper surface side and internally holding the test fish loaded from an upper opening portion. The holder has a slit extending along the front-rear direction in a bottom portion of the holding groove and exposing the abdomen of the test fish held inside the holding groove through a lower surface side. A width of the slit is widened by generating a tensile force from an inside toward an outside on the lower surface side of the holder.