Thanks to the Department of Neurosurgery of the Second Affiliated Hospital of Army Medical University for site support.&#160;Funding: This work was supported by the Natural Science Foundation of China (82104696).

The experiments in this study comply with the &#34;3Rs&#34; principle of animal ethics and have been approved by the Laboratory Animal Welfare and Ethnic Committee of the Army Medical University (AMUWEC20234543).
1. Preparation of rodent body fixation device
<ol>
	<li>Design a small animal holder based on the Chinese utility model patent9.</li>
	<li>Produce the device through 3D printing technology.</li>
	<li>Prepare a 2 m long rope and divide it into 6 ropes. Thread these 6 ropes through the holes in the fixator. Utilize the spring-loaded buckle to fasten the rope ends, facilitating loop size adjustment. 
	&#8203;NOTE: The fixator could be manufactured by any company equipped with 3D printing technology based on a design drawing. The design drawing of the device is shown in Figure 1. The fixator used in this study was produced by a 3D printer by a printing method called fused deposition modeling (FDM), also known as fused filament fabrication (FFF)10. This additive manufacturing method prints the parts of the design layer by layer by selectively depositing the material in the melted form in a predetermined path. The process uses thermoplastic polymers that come in filaments to create the final physical structure. The immobilization apparatus utilized in this study can secure three animals simultaneously, necessitating six ropes, with each animal requiring a pair of ropes: one for the neck and one for the trunk.</li>
</ol>
2. Preparation of rodents
<ol>
	<li>Purchase 3 Sprague-Dawley rats (10-40 g, 7-45 days old) and 3 C57 BL/C mice (5-40 g).</li>
	<li>Breed animals in a room with a 12 h day/night cycle, an ambient temperature of 21-23 &#176;C, and a humidity of 45%-60%. Disinfect and ventilate the feeding environment regularly, and allow the animals to eat and drink freely.</li>
</ol>
3. Fixing rodents to the fixator (prone position)
<ol>
	<li>Place the head of the rodent in the U-shaped hole in front of the fixator, with the rodent in a prone position. Pass the rodent&#39;s body through two rope loops.</li>
	<li>Fasten the ropes around the neck and abdomen of the rodent, ensuring that it cannot escape, but not so tightly as to cause respiratory distress and death.
	<ol>
		<li>The key step is to fix the neck in place. Leave a gap of 2-5 mm between the rodent&#39;s neck and the rope. Ensure that the rope is not too tight for the animals to strangle or too loose to escape.</li>
	</ol>
	</li>
	<li>Fix the other rodents in the same way in the device.</li>
	<li>Repeat the above fixation steps (3.1-3.2) for 3 days to minimize the potential stress response caused by the fixation procedure. Repeat the fixation procedure for 3 consecutive days, with each session lasting 5 min per day. 
	NOTE: To ensure that rodents were not over-stressed during the fixation procedure, we repeated the procedure for 3 consecutive days. Each session lasted 5 min per day, providing ample time for mice or rats to acclimate to the procedure and minimizing any potential discomfort.</li>
	<li>Strat EA from Day 4.</li>
	<li>To prevent the spread of disease, immerse a sterile cotton swab or ball in 75% alcohol and thoroughly wipe the holder to clean and disinfect it before and after each use. Use gloves and other protective equipment to avoid potential health risks when handling rodents.</li>
</ol>
4. Performing EA in mice or young rats (MS6)
<ol>
	<li>Choose 0.25 mm x 13 mm disposable sterile acupuncture needles.</li>
	<li>Find the acupoints by anatomical location and confirm the insertion depth at the acupoint. 
	NOTE: MS6 is located on the lateral side of the head. This region in the head passes through the connection between Shencong (Ex-hn1) and Xuanli (GB6), also known as the anterior parietal (Du21). MS6 corresponds to the expression of the precentral gyrus of the cerebral cortex on the scalp. Ex-hn1 is located 0.5 cm behind the midpoint of the anterior-posterior midline of the head. GB6 is located at the midpoint of the front of the ear and the end angle of the eye. The superior supratrochlear nerve, supraorbital nerve, occipital nerve, and auriculotemporal nerve are distributed in it. MS6 is mainly used to treat stroke and encephalopathy, such as motor disorders.</li>
	<li>Slowly twist and insert sterile needles bilateral into MS6 at a depth of 3/5 from the anterior Shenchong (Exhn1) to the Xuanli (GB6) along the subcutaneous in 3 rodents, respectively.</li>
	<li>Connect one side of the connection cable to the EA instrument.</li>
	<li>Connect another side of the connection cable containing the positive and negative EA clips to the acupuncture needle shanks on the left and right MS6.</li>
	<li>Turn on the EA instrument.
	<ol>
		<li>Rotate the button (Function/ Choose Switch) to set the frequency and function mode.</li>
		<li>Set the Frequency to 10 Hz and choose a Continuous Wave mode.</li>
		<li>Rotate the corresponding button (Adjust Intensity) to set the intensity. Each adjust intensity button controls the current strength of the rodents of the wire connected below it. Adjust the current intensity to the acceptable range of rodents, usually 1-2 mA, lasting 5 min. 
		&#8203;NOTE: It is important to monitor the breathing and behavior of the rodents during the procedure to ensure that they are not experiencing any distress or discomfort. If the rat appears to be struggling or in pain, the procedure should be stopped immediately.</li>
	</ol>
	</li>
</ol>
5. Fixing rodents to the fixator (supine position)
<ol>
	<li>Place the heads of the rodent in the U-shaped hole in front of the fixator, with the rodent in a prone position. Pass the rodent&#39;s body through two rope loops.</li>
	<li>Fasten the rope around the neck and abdomen of the rodent, ensuring that it cannot escape, but not so tight as to cause respiratory distress and death. 
	NOTE: The points to be noted during fixation are the same as in step 3.2.</li>
	<li>Fix the other rodents in the same way.</li>
	<li>As in step 3.4, repeat the above fixation steps for 3 days to reduce the stress response of rodents.</li>
	<li>Strat EA from Day 4. 
	&#8203;NOTE: Disinfection is performed as mentioned in step 3.6.</li>
</ol>
6. Performing EA (ST25)
<ol>
	<li>Choose 0.25 mm x 13 mm disposable sterile acupuncture needles.</li>
	<li>Find the acupoints by anatomical location and confirm the insertion depth at the acupoint. 
	NOTE: ST25 is located at the level of the umbilicus. Positioning this point in rodents requires first measuring the length of the rodent&#39;s paw. ST25 is located at 2/3 the length of the paw next to the navel. For example, if the measured paw of the rodent is 0.6 cm, then ST25 is located 0.4 cm to the right and left of the umbilicus.</li>
	<li>Slowly twist and penetrate sterile needles into ST25 bilateral at a depth of 4-8 mm on 3 rodents, respectively.</li>
	<li>Connect one side of the connection cable to the EA instrument.</li>
	<li>Connect another side of the connection cable containing the positive and negative EA clips to the acupuncture needle shanks on the left and right ST25.</li>
	<li>Turn on the EA instrument.
	<ol>
		<li>Rotate the button (Function/ Choose Switch) to set the frequency and function mode.</li>
		<li>Set the Frequency to 10 Hz and choose Continuous Wave Mode.</li>
		<li>Rotate the corresponding button (Adjust Intensity) to set the intensity. Each adjust intensity button controls the current strength of the rat of the wire connected below it. Adjust the current intensity to the acceptable range of rodents, usually 1-2 mA, lasting 5 min. 
		NOTE: The observations were the same as in step 4.6.</li>
	</ol>
	</li>
</ol>

Using a 3D Printed Holder for Bulk Electroacupuncture in Small Animals

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J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Electroacupuncture+ameliorates+neuroinflammation+in+animal+models.">Electroacupuncture ameliorates neuroinflammation in animal models.</a> Acupuncture in Medicine: Journal of the British Medical Acupuncture Society. 40 (5), 474-483 (2022).</li><li>Mengzhu, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Electroacupuncture+at+Tianshu+(ST25)+and+Zusanli+(ST36)+alleviates+stress-induced+irritable+bowel+syndrome+in+mice+by+modulating+gut+microbiota+and+corticotropin-releasing+factor.">Electroacupuncture at Tianshu (ST25) and Zusanli (ST36) alleviates stress-induced irritable bowel syndrome in mice by modulating gut microbiota and corticotropin-releasing factor.</a> Journal of traditional Chinese medicine. 42 (5), 732-740 (2022).</li><li>Xu, D. S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+new+attempt+of+re-mapping+acupoint+atlas+in+the+rat.">A new attempt of re-mapping acupoint atlas in the rat.</a> Acupuncture Research. 44 (1), 62-65 (2019).</li><li>Yin, C. 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I., Yap, T. 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I., Mishra, P., Gamez, J. D., Rodriguez, M., Pirko, I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=MRI+in+rodent+models+of+brain+disorders.">MRI in rodent models of brain disorders.</a> Neurotherapeutics. 8 (1), 3-18 (2011).</li><li>Cong-hui, Q., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Efficacy+observation+of+long-retaining+scalp+acupuncture+plus+interactive+training+for+upper-extremity+dysfunction+after+cerebral+stroke.">Efficacy observation of long-retaining scalp acupuncture plus interactive training for upper-extremity dysfunction after cerebral stroke.</a> Journal of Acupuncture and Tuina Science. 19, 43-48 (2021).</li><li>Kvist, L. J., Hall-Lord, M. L., Rydhstroem, H., Larsson, B. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+randomised-controlled+trial+in+Sweden+of+acupuncture+and+care+interventions+for+the+relief+of+inflammatory+symptoms+of+the+breast+during+lactation.">A randomised-controlled trial in Sweden of acupuncture and care interventions for the relief of inflammatory symptoms of the breast during lactation.</a> Midwifery. 23 (2), 184-195 (2007).</li><li>Boram, L., Chan-Young, K., Sun Haeng, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effectiveness+and+safety+of+auriculotherapy+for+breastfeeding:+a+systematic+review.">Effectiveness and safety of auriculotherapy for breastfeeding: a systematic review.</a> Journal of Traditional Chinese Medicine. 40 (5), 721-737 (2020).</li></ol>

The authors declared that no competing conflicts of interest exist.

Electroacupuncture (EA) is a form of acupuncture that involves the use of electrical stimulation on acupuncture needles11. This technique involves the use of micro-pulse currents of specific intensity and frequency to stimulate acupuncture points and achieve enhanced therapeutic effects3. However, the mechanism of EA for healing is limited and requires extensive basic research to prove1,2,<sup class="xref...

Electroacupuncture (EA) therapy is a unique method in which acupuncture needles are inserted into the scalp and connected to an electro-machine to stimulate specific points1. Unlike manual stimulation, EA allows better control of stimulation by stabilizing specific frequencies and waveforms to achieve optimal therapeutic effects2. According to a survey, 81.2% of medical institutions in China use EA or manual acupuncture to treat cerebral palsy, neuralgia, facial palsy, and other conditions. Despite its popularity, the specific mechanism of efficacy of EA is still unknown, which has hindered its promotion and application in the rehabilitation treatment of neurological diseases1,2,3. Further research is needed to fully understand the mechanism of EA&#39;s effectiveness and to promote its use in the rehabilitation treatment of neurological diseases.
As the influence of acupuncture expands worldwide, many studies have already investigated the mechanisms of EA performed on rodent models, such as rat or mouse models1,2,3. Several issues are often encountered in EA&#39;s rodent experiments. The first is how to immobilize rodents without anesthesia, as acupuncture performed on awake subjects is more reflective of clinical practice. In addition, some experiments require animals to be awake to observe treatment effects2,3. Another challenge is accurately locating the acupoints in mice or rats that correspond to those in humans. The precise localization of acupoints in experimental rodents is currently being studied by many scholars4,5. In this protocol, MS6 and ST25 were selected, which have been clearly defined in rodents by the transformation of human anatomical localization. MS6 is commonly used for the treatment of some brain diseases, such as Parkinson&#39;s disease6. ST25 is usually used to treat gastrointestinal problems, such as diarrhea7. These two acupoints were chosen primarily to demonstrate how rodents can be effectively immobilized in both supine and prone positions. Moreover, these acupoints have been extensively studied and offer significant insights for research purposes6,7.
The previous method of immobilizing a single rat for experiments is not only time-consuming but also difficult to handle by a single person8. Additionally, due to the non-cooperation of animals, the success rate is relatively low in practice. Therefore, there is a critical need to create an easily established animal model with stable characteristics to improve experiment efficiency. In this article, a 3D printed holder for small animals was introduced that could easily immobilize multiple rodents, leading to motor restriction. The aim of this paper is to administer EA treatments to a batch of young rats or mice, focusing on the strategies for bulk restriction of mice, identification, and stimulation of MS6 and ST25 acupoints.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>3D printing batch mice fixator</td>
			<td>MESH INVENT</td>
			<td>Custom made</td>
			<td>The fixator produced by 3D printer. The printing method is called fused deposition modeling (FDM), also known as fused filament fabrication (FFF).&#160;&#160;</td>
		</tr>
		<tr>
			<td>Electroacupuncture instrument</td>
			<td>Hwato, Suzhou Medical Appliance Factory</td>
			<td>SDZ-III</td>
			<td>www.Hwato-med.com</td>
		</tr>
		<tr>
			<td>Disposable sterile acupuncture needle</td>
			<td>Suzhou Medical Appliance Factory</td>
			<td>N/A</td>
			<td>0.25 mm x 13 mm</td>
		</tr>
	</tbody>
</table>

bulk electroacupuncture operation for mice or young rats

Electroacupuncture (EA) is widely used to treat various health conditions. However, the underlying mechanism of EA treatment remains unclear, hindering its promotion. The mechanistic study requires mouse or rat models to address this issue. However, these animals are not obedient to the experimental process, which is time-consuming. To solve these problems, we designed a 3D-printed small animal body bulk fixator to improve the efficiency of EA's animal experiments. This video shows in detail how to use the fixator to perform bulk EA on mice or young rats. For the selection of acupoints, the anterior oblique line of vertex temporal (MS6 head) and Tianshu point (ST25 belly) were chosen to verify the effect of the fixation device with prone positioning and supine positioning. Using the 3D-printed small animal holder allows multiple rodents to be immobilized and treated simultaneously, reducing the time and resources required for the experiment. This technique could be applied to other animal models by 3D printing different sizes and could potentially be used for various fixing conditions. The device is beneficial for the promotion of experimental scientific research in EA.

Author Spotlight: Using a 3D-Printed Holder for Simultaneous Multiple Electroacupuncture Operation

Bulk Electroacupuncture Operation for Mice or Young Rats

In this video, we introduce an efficient way of using electroacupuncture on multiple awake mice or rats. In vesical research, animal is urinating, but they are not cooperative, and acupuncture only is time consume. Another issue is about the anesthesia, which is not clinical applicable of acupuncture.To address these issues, we demonstrate efficient method of performing electroacupuncture on multiple awake mice or rats by using 3D printed holder. Our protocol demonstrates a more efficiency and safer way to hold multiple animals simultaneously, which unlike other method that imply immobilization, this method not only saves time, but also improve experimental success rates. Additionally, device is designed to be easy to handle, which could be operated by one person.The ProTech and device are beneficial for the promotion of experimental scientific research in electroacupuncture.

The floor plan of the animal body fixator we designed is shown in Figure 1. In addition, a 3D graphic model of this fixator was submitted to provide a comprehensive view of the design (Supplementary File 1). This is a device that allows 3 rodents to be immobilized and perform EA simultaneously. Rats and mice were restricted to the fixator in the awake state, and both prone and supine positions could be firmly fixed without causing injury to the rodents (...

Watch this Scientific Journal Video about Bulk Electroacupuncture Operation for Mice or Young Rats at JoVE.com

Here, we present a protocol for efficient and rapid electroacupuncture (EA) in mice or young rats using a three-dimensional (3D) printed holder. This technique allows simultaneous operation on multiple animals, saving time and increasing experimental efficiency.

Electroacupuncture (EA) is widely used to treat various health conditions. However, the underlying mechanism of EA treatment remains unclear, hindering ...

bulk-electroacupuncture-operation-for-mice-or-young-rats

Research

JoVE Journal

Biology

450 Views.  Army Medical University. In this video, we introduce an efficient way of using electroacupuncture on multiple awake mice or rats. In vesical research, animal is urinating, but they are not cooperative, and acupuncture only is time consume. Another issue is about the anesthesia, which is not clinical applicable of acupuncture.To address these issues, we demonstrate efficient method of performing electroacupuncture on multiple awake mice or rats by using 3D printed holder. Our protocol demonstrates a more effici...