Helmet for macaque percutaneous acupoint electrical stimulation experiment

Abstract

The utility model discloses a helmet for macaque percutaneous acupoint electrical stimulation experiments, which comprises a helmet body, a neck ring arranged below the helmet body, an opening arranged on the helmet body at a position corresponding to the face of a macaque, an eyepiece movably arranged at the position of the opening, and a needle therapy instrument fixedly arranged on the inner side of the helmet body at a position corresponding to the top of the macaque. The needle therapy instrument is connected with a head stimulation electrode and a detection electrode, the head stimulation electrode can stimulate acupuncture points of the head of the macaque, and the detection electrode can detect brain wave signals; the needle therapy instrument is connected with the wireless communication module, and the needle therapy instrument can be remotely controlled through the wireless communication module, and changes of brain waves can be remotely received and recorded in real time. According to the utility model, the eyepiece which can be opened and closed is arranged, so that a hand can conveniently stretch into the helmet to fix the stimulating electrode and the detection electrode on the head of the macaque, and the condition that the electrodes are pulled down by the macaque in an experiment process is avoided; in addition, through double-position supporting of the neck and the head top of the macaque, the pressing feeling of the helmet body can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of transcutaneous nerve electrical stimulation, in particular to a helmet for macaque transcutaneous acupoint electrical stimulation experiments. Background Art

[0002] Major Depressive Disorder (MDD) is a complex mental illness characterized by low mood, loss of interest, and decreased energy. According to an official report by the World Health Organization (WHO) in 2017, the global incidence of depression accounts for 4.3% of the total population, and is increasing year by year. MDD brings great burdens to society, families, and individuals. This disease has become the number one non-fatal disabling disease. The prevention and treatment of MDD has become a major problem that needs to be solved in the health field of my country and even the world. For the prevention and treatment of MDD, although there are more and more antidepressant drugs available for clinical use today, 40%-50% of patients still do not respond to antidepressant treatment, and antidepressant treatment has large side effects and poor compliance. Therefore, when antidepressant treatment cannot meet clinical needs, it is particularly urgent to seek effective non-drug therapies.

[0003] Acupuncture is an important part of traditional Chinese medicine. As a non-drug intervention, it has been used to treat MDD since ancient times. In recent years, reviews and meta-analyses on acupuncture treatment for MDD have shown that it is a safe and effective antidepressant. Neuromodulation therapy is a new non-drug treatment strategy spawned by the development of neuroscience in recent years. Vagus nerve stimulation (VNS) and trigeminal nerve stimulation (TNS) therapy, which currently belong to its category, have been used in the study of treating MDD. In China, acupuncture anti-depression currently mostly uses head acupoints and ear acupoints. Baihui and Yintang are the two main acupoints recommended for anti-depression treatment in the "Guidelines for Evidence-Based Acupuncture Clinical Practice-Depression". A lot of experiments are needed to understand how to electrically stimulate these two acupoints to effectively relieve depressive symptoms.

[0004] During the experiment, macaques are mostly used for electrical stimulation experiments. However, macaques are active and easy to scratch the equipment. Therefore, they have high requirements for the firmness of the electrode fixation and the comfort of the acupuncture equipment. Therefore, it is necessary to design an instrument for macaque transcutaneous electrical nerve stimulation experiments to ensure the accuracy of the experimental results. Then, it will be studied for the treatment of mental and neurological diseases such as depression, epilepsy and insomnia, so that patients can get rid of the disease as soon as possible. Utility Model Content

[0005] The utility model provides a helmet for a macaque transcutaneous electrical acupoint stimulation experiment, which has the effects of being comfortable to wear, convenient to use, and having electrodes firmly fixed. The specific technical scheme is as follows:

[0006] A helmet for percutaneous electrical acupoint stimulation experiments on macaques comprises a helmet body, a neck ring is arranged below the helmet body, the head of the macaque can be inserted into the helmet body through the neck ring, an opening is arranged at a position on the helmet body corresponding to the face of the macaque, an eyepiece is movably arranged at the opening position, and the opening can be opened or closed by moving the eyepiece; an acupuncture instrument is fixedly arranged at a position on the inner side of the helmet body corresponding to the top of the macaque's head, the acupuncture instrument is connected with a head stimulation electrode and a detection electrode, the head stimulation electrode can stimulate the acupoints on the head of the macaque, and the detection electrode is connected to the position of the macaque's forehead or behind the ear to detect brain wave signals; a power supply component is arranged in the acupuncture instrument, and the power supply component can provide current for the head stimulation electrode and the detection electrode; the acupuncture instrument is connected to a wireless communication module, and the acupuncture instrument can be remotely controlled through the wireless communication module, and the changes of brain waves can be remotely received and recorded in real time.

[0007] Furthermore, an elastic ring is fixedly provided on the inner side of the neck ring, and the elastic ring can contact the neck of the macaque to provide support for the helmet body.

[0008] Furthermore, both sides of the eyepiece are hinged to the helmet body, and the eyepiece can be rotated up and down relative to the helmet body to make the opening in an open or closed state; hinged columns are provided on both sides of the helmet body, and hinged sleeves are fixedly provided on both sides of the eyepiece, and the hinged sleeves can be sleeved on the outer sides of the hinged columns to realize the hinge connection between the eyepiece and the helmet body; the hinged column is threadedly connected to the fastening handle, and rotating the fastening handle can make the fastening handle contact with the hinged sleeve, thereby locking the eyepiece and the helmet body.

[0009] Furthermore, a VR display screen is provided on the eyepiece, and the eyepiece can play videos.

[0010] Furthermore, a fixing bracket is fixedly provided at a position on the inner side of the helmet body corresponding to the top of the macaque's head, and the fixing bracket can contact the top of the macaque's head to provide support for the helmet body.

[0011] Furthermore, the fixing bracket includes retractable legs connected to a fixing ring, an outer surface of the fixing ring is provided with an elastic layer, and the fixing ring can contact the top of the macaque's head to provide support for the helmet body.

[0012] Furthermore, the support leg includes an outer support leg and an inner support leg. The outer support leg is fixedly connected to the helmet body, one end of the inner support leg is inserted into the outer support leg, and the other end of the inner leg is connected to the fixing ring; a locking handle is provided on the side wall of the outer support leg, and the locking handle is threadedly connected to the outer support leg. Rotating the locking handle can make the locking handle contact with the inner support leg, thereby fixing the relative position of the outer support leg and the inner support leg.

[0013] Furthermore, the acupuncture instrument is also connected to an ear stimulation component, which includes an ear plug, on which an ear acupoint electrode is provided. The ear plug can be inserted into the ear hole of the macaque and fixed in position, and the ear acupoint electrode can stimulate the ear acupoints.

[0014] Furthermore, the earbuds can play music.

[0015] Furthermore, a breathing hole is arranged on the helmet body at a position corresponding to the lower jaw of the macaque.

[0016] The utility model discloses a helmet for percutaneous acupoint electrical stimulation experiments on macaques, which is cleverly designed and easy to operate. It adopts a helmet body as a carrier of an acupuncture therapy instrument and is provided with an openable and closable eyepiece, which makes it convenient to put a hand into the helmet to fix the stimulation electrode and the detection electrode on the head of the macaque, and also prevents the macaque from tearing off the stimulation electrode and the detection electrode during the experiment. In addition, the sticky fixing components on the head stimulation electrode, the detection electrode and the ear acupoint electrode can further fix the electrodes, greatly improving the reliability of the electrode work and the effectiveness of the electrical stimulation. At the same time, because the elastic sticky ring contacts the skin, the squeezing feeling of the electrode head is reduced, and the comfort is increased.

[0017] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the closed state of the helmet used for the macaque transcutaneous electrical acupoint stimulation experiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of the opening state of the helmet for macaque transcutaneous electrical acupoint stimulation experiment of the present invention;

[0021] Figure 3 A stereoscopic diagram of the head stimulation electrodes of the helmet for the macaque transcutaneous electrical acupoint stimulation experiment of the present invention;

[0022] Figure 4 A three-dimensional diagram of the head stimulation electrode of the helmet for the macaque transcutaneous electrical acupoint stimulation experiment of the utility model with the electrode cover removed;

[0023] Figure 5 An exploded view of the head stimulation electrode of the helmet used for the macaque transcutaneous electrical acupoint stimulation experiment of the utility model;

[0024] Figure 6 The utility model is a stereoscopic diagram of the ear stimulation component of the helmet for the macaque transcutaneous electrical acupoint stimulation experiment. DETAILED DESCRIPTION

[0025] In order to better understand the purpose, function and specific design scheme of the utility model, the helmet for macaque transcutaneous electrical acupoint stimulation experiment of the utility model is further described in detail below with reference to the accompanying drawings.

[0026] like Figure 1-6 As shown, the utility model of the helmet for percutaneous electrical acupoint stimulation experiment of macaques comprises a helmet body 1, a neck ring 11 is arranged below the helmet body 1, the head of the macaque can be inserted into the helmet body 1 through the neck ring 11, a plurality of breathing holes are arranged at the position corresponding to the lower jaw of the macaque on the helmet body 1, so as to allow the macaque to breathe; an opening is arranged at the position corresponding to the face of the macaque on the helmet body 1, an eyepiece 12 is movably arranged at the opening position, and the opening can be opened or closed by moving the eyepiece 12; an acupuncture instrument 2 is fixedly arranged at the position corresponding to the top of the head of the macaque on the inner side of the helmet body 1, and the acupuncture instrument 2 is fixedly arranged at the position corresponding to the top of the head of the macaque The acupuncture instrument 2 is connected with a head stimulation electrode 3 and a detection electrode 4. The head stimulation electrode 3 can stimulate the acupuncture points on the head of the macaque. In this embodiment, there are two head stimulation electrodes 3, which are respectively connected to the Baihui acupoint and the Yintang acupoint on the top of the head; the detection electrode 4 is connected to the position of the forehead or behind the ear of the macaque to detect brain wave signals; a power supply component is provided in the acupuncture instrument 2, which can provide current for the head stimulation electrode 3 and the detection electrode 4; the acupuncture instrument 2 is connected to a wireless communication module, through which the acupuncture instrument 2 can be remotely controlled and the changes in brain waves can be remotely received and recorded in real time. The wireless communication module can be an existing Wifi module or a Bluetooth module or other module that can transmit data wirelessly.

[0027] Specifically, an elastic collar 111 is fixedly arranged inside the neck ring 11, and the elastic collar 111 can contact the neck of the macaque to provide support for the helmet body 1. The elastic collar 111 can be made of sponge or silicone, so that the elastic collar 111 is softer and more comfortable for the macaque to wear.

[0028] The two sides of the eyepiece 12 are hinged to the helmet body 1, and the eyepiece 12 can be rotated up and down relative to the helmet body 1 so that the opening is in an open or closed state. In the open state, the hand can be inserted into the helmet to fix the stimulation electrode 3 and the detection electrode 4 on the macaque's head; in the closed state, the macaque can be prevented from scratching and pulling the stimulation electrode 3 and the detection electrode 4, and the stimulation electrode 3 and the detection electrode 4 can be prevented from falling from the macaque's head.

[0029] Preferably, hinged columns are provided on both sides of the helmet body 1, and hinged sleeves are fixedly provided on both sides of the eyepiece 12, which can be sleeved on the outer sides of the hinged columns to realize the hinge connection between the eyepiece 12 and the helmet body 1; the hinged column is threadedly connected to the fastening handle 13, and rotating the fastening handle 13 can make the fastening handle 13 contact with the hinged sleeve, thereby locking the eyepiece 12 and the helmet body 1 to prevent the macaque from pushing the eyepiece 12 open when it is closed.

[0030] The eyepiece 12 of the present embodiment is provided with a VR display screen, and the eyepiece 12 can play videos that the macaques are interested in to attract the macaques' attention, reduce the boredom during the experiment, and make the experimental results more accurate.

[0031] It is worth noting that in order to reduce the pressure of the helmet body 1 on the macaque's neck, a fixed bracket 5 is fixedly arranged at the position corresponding to the top of the macaque's head on the inner side of the helmet body 1, and the fixed bracket 5 can contact the top of the macaque's head to provide support for the helmet body 1. Through the dual-position support of the neck and the top of the macaque's head, the pressure of the helmet body 1 can be reduced and the comfort of the macaque wearing can be improved.

[0032] The fixing bracket 5 includes a retractable leg 51, which is connected to a fixing ring 52. The fixing ring 52 can contact the top of the macaque's head to provide support for the helmet body 1. An elastic layer is provided on the outer surface of the fixing ring 52. The material of the elastic layer can be made of rubber or silicone, so that the fixing ring 52 is softer and more comfortable for the macaque to wear. The legs 51 of this embodiment are two and are respectively arranged on both sides of the acupuncture treatment instrument 2. The two legs 51 are respectively connected to the two sides of the fixing ring 52, and the fixing ring 52 is arranged below the acupuncture treatment instrument 2. The retractable leg 51 includes an outer leg and an inner leg. The outer leg is fixedly connected to the helmet body 1, one end of the inner leg is inserted into the inner part of the outer leg, and the other end of the inner leg is connected to the fixing ring 52. Preferably, a locking handle 53 is provided on the side wall of the outer leg, and the locking handle 53 is threadedly connected to the outer leg. Rotating the locking handle 53 can make the locking handle 53 contact the inner leg, thereby fixing the relative position of the outer leg and the inner leg. The fixing ring 52 can be fine-tuned by the retractable legs 51 so that the fixing ring 52 can effectively contact the top of the macaque's head.

[0033] like Figure 3-5As shown, the head stimulation electrode 3 includes an electrode holder 31, and the electrode holder 31 includes a receiving cavity 311. An electrode head 32 is arranged at the center of the receiving cavity 311. The electrode head 32 is connected to a wire, and the wire extends to the outside of the electrode holder 31 and is connected to the acupuncture instrument. A fixing component 33 is sleeved on the outside of the electrode head 32, and the fixing component 33 is accommodated in the receiving cavity 311. The fixing component 33 can fix the electrode head 32 on the skin surface to prevent the electrode head 32 from moving. The fixing component 33 includes an adhesive ring 331, and the adhesive ring 331 is detachably arranged in an annular fixing groove 332. The height of the upper surface of the adhesive ring 331 is lower than the height of the electrode head 32, that is, the electrode head 32 protrudes from the upper surface of the adhesive ring 331 to ensure reliable contact between the electrode head 32 and the skin. The inner ring of the annular fixing groove 332 is sleeved with the electrode head 32, and the outer ring of the annular fixing groove 332 is interference fit with the receiving cavity 311 of the electrode holder 31.

[0034] Preferably, in order to facilitate the replacement of the adhesive ring 331, a plurality of first through holes 333 are provided at the bottom of the fixing groove 332. By pressing the adhesive ring 331 through the first through holes 333 with a tool, the adhesive ring 331 can be pushed out of the fixing groove 332. It is understandable that a plurality of second through holes can also be provided at positions corresponding to the bottom of the fixing groove 332 on the electrode holder 31 to facilitate the removal of the fixing groove 332. The adhesive ring 331 of this embodiment can be made of silicone gel, soft silicone dressing, self-adhesive polyurethane foam dressing, etc.; it can also be made by coating a composite hydrocolloid or acrylic adhesive on the upper surface of the adhesive ring 331 made of elastic material.

[0035] It is worth noting that the head stimulation electrode 3 further includes an electrode cover 34, which is detachably connected to the outer surface of the electrode seat 31 or the fixing groove 332. In this embodiment, the electrode cover 34 is threadedly connected to the outer surface of the fixing groove 332. The electrode cover 34 can prevent the adhesive ring 331 from adhering to other objects or the headgear body 1 when the head stimulation electrode 3 is not in use.

[0036] In addition, the detection electrode 4 of this embodiment has the same structure as the head stimulation electrode 3, which will not be described in detail here.

[0037] like Figure 2 and Figure 6 As shown, the acupuncture instrument 2 of this embodiment is also connected to an ear stimulation component 6, which includes an ear plug 61, on which an ear acupoint electrode 7 is arranged, and the ear plug 61 can be inserted into the ear hole of the macaque and fixed in position, and the ear acupoint electrode 7 can stimulate the ear acupoints;

[0038] The earplug 61 includes an insertion end 611 and a fixed end 612 connected to each other. The insertion end 611 is sleeved with an elastic sleeve made of rubber or silicone. The insertion end 611 can be inserted into the ear hole to position and fix the earplug 61. The fixed end 612 is provided with an ear acupoint electrode 7.

[0039] Preferably, the outer side of the fixed end 612 of the present embodiment is fixedly connected with a plastic positioning tube 71, the end of the plastic positioning tube 71 is connected to the ear acupuncture electrode 7, and the plastic positioning tube 71 is made of a plastic metal material, such as copper, iron, aluminum, etc., as long as the plastic positioning tube 71 can be manually bent to align the ear acupuncture electrode 7 with the acupuncture point, and the plastic positioning tube 71 remains in its current state without deformation. The ear acupuncture electrode 7 is connected to the earplug 61 through a wire passing through the plastic positioning tube 71, and the earplug 61 is connected to the acupuncture instrument 2 through a wire.

[0040] In this embodiment, there are two ear acupoint electrodes 7, and correspondingly there are two plastic positioning tubes 71, which can stimulate two ear acupoints at the same time. It is understandable that the number of ear acupoint electrodes 7 on the earplug 61 is not limited as long as it can meet the experimental requirements. It is worth noting that the structure of the ear acupoint electrode 7 is basically the same as that of the head stimulation electrode 3 to improve the reliability of the positioning of the ear acupoint electrode 7. The only difference is that the size of the ear acupoint electrode 7 is smaller than that of the stimulation electrode, which will not be elaborated here.

[0041] It is understandable that the earplug 61 can adopt the structure of the existing in-ear earphones, increase the functions of noise reduction and music playback, and play music or conduct breathing guidance during the experiment to improve the comfort of the experimental process.

[0042] When the utility model is used, the hair at the position of the Baihui acupoint on the top of the macaque's head is first shaved off, and then the helmet body 1 is set on the head of the macaque, and then the eyepiece 12 is rotated to open, and the hand is inserted into the helmet to fix the head stimulation electrode 3 and the detection electrode 4 on the head of the macaque. According to the experimental needs, the Baihui acupoint and the Yintang acupoint can be electrically stimulated at the same time, or they can be stimulated separately, that is, the Baihui acupoint can be stimulated first and then the Yintang acupoint, or the Yintang acupoint can be stimulated first and then the Baihui acupoint, or the Baihui acupoint and the Yintang acupoint can be stimulated at the same time; in addition, according to the experimental needs, it can also be combined with the stimulation of the ear acupoints. The detection electrode 4 detects the brain electrical signal while electrically stimulating and transmits it to the computer for recording and analysis of the brain electrical signal.

[0043] The utility model discloses a helmet for percutaneous electrical acupoint stimulation experiment of macaques, which is cleverly designed and easy to operate. It adopts a helmet body 1 as a carrier of an acupuncture therapy instrument 2 and is provided with an eyepiece 12 that can be opened and closed, which makes it convenient to put one's hand into the helmet to fix the stimulation electrode 3 and the detection electrode 4 on the head of the macaque, and also prevents the macaque from pulling off the stimulation electrode 3 and the detection electrode 4 during the experiment. In addition, the dual-position support of the macaque's neck and the top of the head can reduce the sense of oppression of the helmet body 1 and improve the comfort of the macaque in wearing it. Finally, the adhesive fixing components on the head stimulation electrode 3, the detection electrode 4 and the ear acupoint electrode 7 can further fix the electrodes, which greatly improves the reliability of the electrode work and the effectiveness of electrical stimulation. At the same time, due to the contact between the elastic adhesive ring and the skin, the squeezing feeling of the electrode head is reduced and the comfort is increased.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A helmet for a macaque transcutaneous electrical acupoint stimulation experiment, characterized in that: The invention comprises a helmet body, a neck ring is arranged under the helmet body, and the head of a macaque can be inserted into the helmet body through the neck ring; an opening is arranged at a position corresponding to the face of the macaque on the helmet body, and an eyepiece is movably arranged at the opening position, and the opening can be opened or closed by moving the eyepiece; an acupuncture therapy instrument is fixedly arranged at a position corresponding to the top of the macaque's head on the inner side of the helmet body, and a head stimulation electrode and a detection electrode are connected to the acupuncture therapy instrument, and the head stimulation electrode can stimulate the acupuncture points on the head of the macaque, and the detection electrode is connected to the position of the forehead or behind the ear of the macaque to detect brain wave signals; a power supply component is arranged in the acupuncture therapy instrument, and the power supply component can provide current for the head stimulation electrode and the detection electrode; the acupuncture therapy instrument is connected to a wireless communication module, and the acupuncture therapy instrument can be remotely controlled through the wireless communication module, and the changes of brain waves can be remotely received and recorded in real time.

2. The helmet for percutaneous electrical acupoint stimulation experiment of macaques as claimed in claim 1, characterized in that: An elastic collar is fixedly arranged on the inner side of the neck ring, and the elastic collar can contact the neck of the macaque to provide support for the helmet body.

3. The helmet for percutaneous electrical acupoint stimulation experiment of macaques as claimed in claim 1, characterized in that: The two sides of the eyepiece are hinged to the helmet body, and the eyepiece can be rotated up and down relative to the helmet body to make the opening in an open or closed state; hinged columns are provided on both sides of the helmet body, and hinged sleeves are fixedly provided on both sides of the eyepiece, and the hinged sleeves can be sleeved on the outer sides of the hinged columns to realize the hinge connection between the eyepiece and the helmet body; the hinged column is threadedly connected to the fastening handle, and the fastening handle can be rotated to make the fastening handle contact with the hinged sleeve, thereby locking the eyepiece and the helmet body.

4. The helmet for percutaneous electrical acupoint stimulation experiment of macaques as claimed in claim 3, characterized in that: The eyepiece is equipped with a VR display screen, and can play videos.

5. The helmet for percutaneous electrical acupoint stimulation experiment of macaques as claimed in claim 1, characterized in that: A fixing bracket is fixedly arranged at a position on the inner side of the helmet body corresponding to the top of the macaque's head, and the fixing bracket can contact the top of the macaque's head to provide support for the helmet body.

6. The helmet for percutaneous electrical acupoint stimulation experiment of macaques as claimed in claim 5, characterized in that: The fixing bracket comprises a retractable supporting leg, which is connected to a fixing ring. An elastic layer is arranged on the outer surface of the fixing ring. The fixing ring can contact with the top of the macaque's head to provide support for the helmet body.

7. The helmet for percutaneous electrical acupoint stimulation experiment of macaques as claimed in claim 6, characterized in that: The support leg includes an outer support leg and an inner support leg. The outer support leg is fixedly connected to the helmet body, one end of the inner support leg is inserted into the outer support leg, and the other end of the inner support leg is connected to the fixing ring. A locking handle is provided on the side wall of the outer support leg, and the locking handle is threadedly connected to the outer support leg. Rotating the locking handle can make the locking handle contact with the inner support leg, thereby fixing the relative position of the outer support leg and the inner support leg.

8. The helmet for percutaneous electrical acupoint stimulation experiment of macaques as claimed in claim 1, characterized in that: The acupuncture instrument is also connected to an ear stimulation component, which includes an ear plug, on which ear acupoint electrodes are arranged. The ear plug can be inserted into the ear hole of the macaque and fixed in position, and the ear acupoint electrodes can stimulate the ear acupoints.

9. The helmet for percutaneous electrical acupoint stimulation experiment of macaques as claimed in claim 8, characterized in that: Earbuds can play music.

10. The helmet for percutaneous electrical acupoint stimulation experiment of macaques according to claim 1, characterized in that: A breathing hole is arranged on the helmet body at a position corresponding to the lower jaw of the macaque.

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