Improved Suspension Fixation Using Rat Jacket in Rat Acupuncture Experiments
August 18th, 2023
Here, we present an improved suspension fixation method using a rat jacket to effectively immobilize rats during acupuncture experiments. Furthermore, the structure and application of this fixation apparatus, as well as instructions and evaluation for its utilization in electroacupuncture therapy, is elucidated.
We developed an improved method for suspending and fixing rats with rat clothes in an acupuncture experiment. This protocol aims to provide detailed descriptions of its procedural steps, including important precautions, offering a reference for researchers conducting fundamental experiments in the field of acupuncture and moxibustion. In previously reported studies, researchers have often used anesthesia fixation, high platform fixation, binding fixation, or various other self-made fixators while performing acupuncture or electroacupuncture operations on rats.
Given the side effects of anesthesia on the body and the real clinical conditions, fixation in our weakened stage offer the better alternative. However, in the non-anesthetized stage, the mentioned fixations also possess limitations, such as restricted acupoint exposure, requirement of multiple labels, nonadjustable fixator sites, or forced posture. This method utilizes the rat's preference for burrowing to create rat jackets that fit their body shape.
It offers several advantages over other techniques. It is cost-effective, user-friendly, manpower and space-saving, accommodates rats of varying weights, and can also be used for needle operation on most acupoints. In subsequent studies, we will focus on investigating the impact of the restraints and suspensions of rat clothing on physiological indicators and behavioral aspects related to emotional cognition in rats.
This will enable us to cognitively assess its potential influence on research and refine the fixation method. Wear a pair of gloves before proceeding to fit and secure the rat in the custom-made rat jacket. Then, using one hand, hold the rat jacket's middle and back portion on the table.
Using the other hand, gently hold the rat by its tail to pick it up from the feeding cage and place it into the jacket. As the rat moves forward into the jacket and its head reaches the headgear point, using both hands, carefully pull out its left and right upper limbs from the holes in the jacket. Securely wrap the tying ropes from the opening end of the jacket around the rat's trunk, and tie them tightly at the opposite end to adequately restrain its upper limbs.
Tie the rope loose enough to prevent hypoxia or local limb ischemia, and tight enough to prevent the rat's escape. In a similar manner, secure its lower limbs. Before beginning the procedure of electropuncture on the rat, dress the rat in the custom-made rat jacket, then disinfect the local skin of acupoints using alcohol swabs.
After locating the acupoint accurately, insert the sterile disposable acupuncture needle into the spot at the appropriate depth. Gently suspend the animal from the horizontal iron rod with the help of the S-shaped hooks attached to the rat jacket. Wrap the electrode wire around the horizontal iron rod before securely attaching the small clip at the end of the electrode wire to the needle handle.
Then, after switching on the power, select the appropriate frequency, current, and time. Once the parameters are adjusted, commence the electroacupuncture treatment process. Using the S-shaped hooks, suspend the rats in the same group together on the iron rod for simultaneous electroacupuncture.
When the treatment is over, remove the acupuncture needle along with the clamp from the animal. Then, carefully take the needle out of the clamp and put it in the box. After removing the animal from the suspension hooks, loosen the straps, lift the head cover of the rat's jacket, and position the rat above the cage.
The rat will then be free to release itself from the jacket and enter the cage independently. While performing a 15 minute electroacupuncture experiment on 12 rats, only one rat exhibited intense struggle during the needle retention period, resulting in needle drop. While other rats maintained proper needle fixation throughout the treatment.
When compared to the other fixation methods reported in the literature, the demonstrated method exhibited the combined benefits of stability and secure fixation, efficiency in terms of time and number of personnel required, affordability, as well as relative comfort for the rats. Additionally, in terms of the exposed acupoint range, the specially designed rat jackets in this protocol met the requirements for exposing most acupoints on the body.
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Overview
This article presents an improved suspension fixation method using rat jackets for acupuncture experiments. The apparatus's structure and application, along with instructions for its use in electroacupuncture therapy, are discussed.
Key Study Components
Area of Science
- Neuroscience
- Acupuncture Research
- Animal Experimentation
Background
- Traditional fixation methods often involve anesthesia, which can have side effects.
- Alternative fixation methods may restrict acupoint exposure or require multiple labels.
- Rat jackets utilize the animal's natural burrowing preference for better immobilization.
- This study aims to improve the methodology for acupuncture and electroacupuncture experiments.
Purpose of Study
- To present a safer and more effective fixation method for rats during acupuncture.
- To provide detailed procedural steps and precautions for researchers.
- To enhance the quality of acupuncture and moxibustion experiments.
Methods Used
- Development of rat jackets tailored to the animal's body shape.
- Comparison of the new method with traditional fixation techniques.
- Evaluation of the effectiveness of the fixation during acupuncture procedures.
- Documentation of procedural steps and precautions for researchers.
Main Results
- The rat jacket method provides better acupoint exposure compared to traditional methods.
- Researchers reported fewer complications and improved animal comfort.
- The method allows for adjustable fixation sites and better posture.
- Overall, the new method is a viable alternative to anesthesia fixation.
Conclusions
- The improved suspension fixation method enhances the quality of acupuncture research.
- Rat jackets offer a practical solution to the limitations of existing fixation methods.
- This approach can lead to more reliable experimental outcomes in acupuncture studies.
Frequently Asked Questions
Executive Industry Relevance
Reliable immobilization of laboratory rats is critical for generating reproducible data in preclinical acupuncture and electroacupuncture research. The rat jacket suspension fixation method addresses key challenges in posture control, acupoint accessibility, and animal welfare, directly impacting the quality and scalability of discovery-stage studies. This approach supports efficient, standardized workflows essential for robust target validation and translational continuity in neurobiological and pain research pipelines.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables consistent positioning for hypothesis-driven interrogation of acupuncture mechanisms.
- Reduces confounding variables by minimizing animal stress and movement during procedures.
- Supports functional target validation by ensuring reliable acupoint access and intervention delivery.
Screening & Assay Development
- Facilitates preparation of standardized animal models for downstream pharmacological or mechanistic assays.
- Improves reproducibility and quantitative comparability across experimental groups.
- Streamlines workflow by reducing time, space, and personnel requirements for animal handling.
Translational & Preclinical Research
- Enhances alignment with disease-relevant behavioral and physiological endpoints by minimizing fixation-induced artifacts.
- Supports continuity from discovery through preclinical validation by enabling scalable, high-throughput animal studies.
- Provides a platform for future assessment of physiological and behavioral biomarkers in response to intervention.
Pipeline & Workflow Integration
This fixation method is positioned at the interface of early discovery and preclinical model development, supporting workflows from mechanistic studies to translational research in neurobiology and pain modulation.
- Discovery Biology: Enables controlled hypothesis testing by stabilizing animal posture and minimizing procedural variability.
- Screening: Provides reproducible conditions for quantitative assessment of intervention effects.
- Analytics: Supports collection of consistent physiological and behavioral data for robust statistical analysis.
- Translational Research: Facilitates alignment with clinically relevant endpoints by reducing fixation-related confounders.
- Enterprise Reuse: Offers a scalable, adaptable fixation platform for diverse rodent-based experimental protocols.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence and reduces mechanistic ambiguity in animal-based studies.
- Operational Value: Delivers standardization, reproducibility, and efficiency in animal handling and experimental setup.
- Strategic Value: Improves go/no-go decision quality and resource allocation by minimizing procedural variability.
- Portfolio Impact: Enables risk-adjusted prioritization of discovery and preclinical programs through robust data generation.
Implementation Considerations
- Requires personnel trained in animal handling and jacket fitting to ensure animal welfare and data integrity.
- Needs access to custom-fitted rat jackets, suspension racks, and compatible electroacupuncture instrumentation.
- Demands cross-team standardization of fixation protocols for reproducibility across studies and sites.
- May require adaptation for different rat sizes or experimental endpoints.
- Potential limitations include the need for ongoing assessment of physiological and behavioral impacts of restraint.
