Mask fastening system and anesthesia airway management device

Abstract

A mask fastening system and an anesthetic airway auxiliary management device, which relates to a fastening system and an anesthetic airway auxiliary management device. The present invention aims to solve the problem that the existing mask pressing method cannot adjust the degree of mask pressing at any time, resulting in the problem that it cannot be applied to different types of patients and air leakage. The driving system and multiple transmission systems of the mask fastening system of the present invention are installed in a shell, and the tensioning rope is buckled on the mask and extends into the shell. After passing through multiple transmission systems, the first and second ends are finally accommodated in the driving system. The driving system drives the first and second ends of the tensioning rope to move so that the length of the tensioning rope outside the driving system changes, which is then converted into a change in the size of the force of the tensioning rope to fasten the mask; when tightened, the tension on the tensioning rope outside the driving system is the same. Two flexible arms are installed on the left and right sides of the mask fastening system to form an anesthetic airway auxiliary management device. The present invention is used for anesthetic airway auxiliary management.

Description

Technical Field

[0001] The invention relates to a mask fastening system, in particular to a double-rope mask fastening system for an anesthesia airway auxiliary management device, and belongs to the field of anesthesia medicine. Background Art

[0002] Mask ventilation belongs to non-invasive positive pressure ventilation (NPPV). The advantages of mask NPPV include: the airway management method is less irritating to the patient and the patient is more comfortable; it can avoid the destruction of the normal barrier function of the upper respiratory tract caused by the establishment of an artificial airway, upper respiratory tract injury, respiratory tract infection and other complications. Studies have shown that mask NPPV can be used for acute and chronic respiratory failure caused by various reasons, effectively relieve dyspnea, enhance gas exchange and improve oxygenation function, reduce the proportion of endotracheal intubation, shorten the ICU and total hospital stay, reduce mortality, and improve the quality of life. However, the stability and reliability of mask NPPV technology are not as good as invasive positive pressure ventilation technology, and there are disadvantages such as air leakage, airway obstruction, local skin compression injury, gastrointestinal flatulence, aspiration and sputum discharge disorders, and large airway dead space.

[0003] The announcement number is CN109646774A, and the patent name is: Invention patent for airway management manipulator for assisting positive pressure ventilation with mask, and specifically discloses two symmetrically arranged multi-joint serpentine mechanisms, on which four tentacles are arranged, two of which are used to press the mask, and the other two tentacles are used to support the patient's jaw. This mask pressing method cannot adjust the degree of mask pressing at any time, because the adjustment of mask pressing and jaw support is controlled by the same serpentine mechanism. If the tightness of the serpentine mechanism is adjusted, it will affect the use effect of the other pair of tentacles.

[0004] In summary, the existing mask pressing method has the problem that the degree of mask pressing cannot be adjusted at any time, resulting in the problem that it cannot be applied to different types of patients and there is a problem of air leakage. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the existing mask pressing method cannot adjust the degree of mask pressing at any time, resulting in the problem that it cannot be applied to different types of patients and air leakage. Further, a mask fastening system and anesthesia airway auxiliary management device are provided.

[0006] The technical solution of the present invention is: a mask fastening system, including a driving system, multiple transmission systems, a mask, a tightening rope and a shell, the driving system and the multiple transmission systems are installed in the shell, the tightening rope is buckled on the mask and extends into the shell, passes through the multiple transmission systems, and finally both ends are accommodated in the driving system, the driving system drives the first and second ends of the tightening rope to move so that the length of the tightening rope outside the driving system changes, which is then converted into a change in the magnitude of the force of the tightening rope to fasten the mask; when tightened, the tension on the tightening rope outside the driving system is the same.

[0007] The present invention also provides an anesthesia airway auxiliary management device, comprising the above-mentioned mask fastening system and two flexible arms, wherein the two flexible arms are installed on the left and right sides of the mask fastening system.

[0008] Compared with the prior art, the present invention has the following effects:

[0009] 1. The present invention can adjust the output force of the fastening motor B-1 of the drive system B by adjusting the knob on the anesthesia airway auxiliary management device, and then adjust the magnitude of the fastening force through the transmission system, and can directly read the magnitude of the fastening force according to the scale on the knob. The present invention drives the first and second ends of the tensioning rope G to move through the drive system B to change the length of the tensioning rope G outside the drive system B, which is then converted into a change in the magnitude of the force of the tensioning rope G to fasten the mask B-7; when tightened, the tension on the tensioning rope G outside the drive system B is the same. This ensures that the mask can be evenly sealed all around to prevent air leakage.

[0010] 2. The movement range of the tension rope G of the present invention can reach 50mm-100mm, which can adapt to the face shape of most patients.

[0011] 3. The driving system of the present invention is used to output power and transmit the power to the transmission system through the wire rope; the transmission system is used to convert the displacement of the wire rope output by the guide wheel into the synchronous displacement of the four wire rope ports at the end; the mask and the rope are used to convert the displacement of the four wire rope ports at the end of the transmission system into the force of the rope to fasten the mask; the entire mask fastening process is simple, and the operation is flexible and reliable.

[0012] 4. The anesthesia airway auxiliary management device of the present invention controls the pressing of the mask and the supporting of the mandible independently, and the two actions are coordinated without interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is an axonometric view of the present invention; Figure 2 It is an exploded view of the single-slot wire wheel assembly D; Figure 3 is an exploded view of drive system B; Figure 4It is a schematic diagram of the structure of the present invention installed on an anesthesia airway auxiliary management device. DETAILED DESCRIPTION

[0014] The technical solution of the present invention is not limited to the specific implementation modes listed below, but also includes any reasonable combination of the specific implementation modes.

[0015] Specific implementation method 1: Combination Figures 1 to 3 This embodiment is described. This embodiment includes a drive system B, multiple transmission systems, a mask B-7, a tensioning rope G, and a housing C. The drive system B and the multiple transmission systems are installed in the housing C. The tensioning rope G is buckled on the mask B-7 and extends into the housing C. After passing through the multiple transmission systems, the ends are finally accommodated in the drive system B. The drive system B drives the ends of the tensioning rope G to move so that the length of the part outside the drive system B changes, which is then converted into a change in the magnitude of the force of the tensioning rope G to buckle the mask B-7. When tightened, the tensioning rope G is subjected to the same tension at all locations outside the drive system B. Since the tensioning rope G is subjected to the same tension at all locations, and the tensioning rope G is buckled on the mask B-7, the tensioning rope G is subjected to the same force on each mask B-7, thereby ensuring that the mask can be evenly sealed around to prevent air leakage.

[0016] Specific implementation method 2: Combination Figure 1 To explain this embodiment, the multiple transmission systems of this embodiment are installed in the housing C in a rectangular array, and the mask B-7 is located above the middle of the rectangular array. This arrangement further enables the tension rope G to be symmetrically arranged for each tension on the mask B-7, ensuring the mask pressing effect. The other components and connection relationships are the same as those of the specific embodiment 1.

[0017] Specific implementation method three: Combination Figure 3 This embodiment is described. The driving system B of this embodiment includes a tightening motor B-1, a tightening motor seat B-2 and a double-slot guide wheel B-3. The tightening motor B-1 is installed on the tightening motor seat B-2, and the double-slot guide wheel B-3 is fixedly connected to the output shaft of the tightening motor B-1. The double-slot guide wheel B-3 can accommodate the head and end of the tensioning rope G at the same time. When the tightening motor B-1 is working, it drives the double-slot guide wheel B-3 to rotate, thereby tightening or loosening the head and end of the tensioning rope G at the same time, realizing the length change of the wire rope G. This structure saves internal space and ensures that the head and end of the tensioning rope G are subjected to the same force, which is conducive to improving the service life of the wire rope G.

[0018] Preferably, the drive system B also includes a double-slot guide wheel cover B-4 and a guide wheel locking block B-5, the double-slot guide wheel cover B-4 is buckled on the fastening motor seat B-2 to cover the double-slot guide wheel B-3, and the guide wheel locking block B-5 is installed between the double-slot guide wheel B-3 and the double-slot guide wheel cover B-4 to fix the double-slot guide wheel B-3 and the output shaft of the fastening motor B-1; the double-slot guide wheel cover B-4 covers the moving component double-slot guide wheel B-3 to prevent it from interfering with other components.

[0019] Preferably, the double-slot guide wheel cover B-4 is provided with two upper and lower parallel tensioning rope G inlets and outlets to ensure that the tensioning rope G can smoothly enter the double-slot guide wheel B-3 from the symmetrical upper and lower ends and left and right sides of the double-slot guide wheel B-3.

[0020] The double-slot wire pulley B-3 of this embodiment has a through hole at its axis that matches the output shaft of the tightening motor B-1. A groove for accommodating the guide wheel locking block B-5 is designed next to the through hole according to the shape of the motor output shaft, and a threaded hole runs through the groove of the guide wheel locking block B-5. This design makes it easy to fix the double-slot wire pulley B-3 on the output shaft of the tightening motor B-1, so that the double-slot wire pulley B-3 can rotate with the tightening motor B-1. Of course, a corresponding reducer can also be connected between the double-slot wire pulley B-3 and the output shaft of the tightening motor B-1 as needed. There are two symmetrical through holes on the side of the double-slot guide wheel B-3, which are used to lock the end of the tensioning rope G. There is a rope hole in the front and rear grooves of the double-slot guide wheel B-3, which runs through the through hole on the side of the double-slot guide wheel B-3.

[0021] The tightening motor B-1 is fastened to the tightening motor base B-2 by motor bolts, and the output shaft of the tightening motor B-1 passes through the center hole of the double-slot wire wheel B-3. The guide wheel locking block B-5 clamps the motor shaft and is locked by the tightening bolts. The tensioning rope G is wound in the front and rear grooves of the double-slot wire wheel B-3, and the rope end is deep into the rope hole of the wire groove and locked at the position through the rope hole. The double-slot guide wheel cover B-4 is then fastened to the tightening motor base B-2 with tightening bolts, and the end of the tensioning rope G is passed through the side hole of the double-slot guide wheel cover B-4. This design can easily fix the tensioning rope G on the double-slot guide wheel B-3, and isolate the moving component double-slot guide wheel B-3 from other components to prevent interference, thereby improving the reliability of the device. Other components and connection relationships are the same as those of specific implementation method one or two.

[0022] Specific implementation method four: Combination Figure 1 and Figure 2This embodiment is described. The multiple transmission systems of this embodiment are all single-line groove wire wheel assemblies D. This arrangement facilitates the tensioning rope G to slide on the single-line groove wire wheel assembly D and has a simple structure and low cost. The other components and connection relationships are the same as any one of the specific embodiments 1 to 3.

[0023] Specific implementation method five: Combination Figure 1 and Figure 2 The present embodiment is described. The single-slot wire wheel assembly D of the present embodiment includes a wire wheel seat D-1, a transmission guide wire wheel D-3, a transmission guide bearing D-4 and a transmission guide wheel shaft D-5.

[0024] The transmission guide wheel shaft D-5 is fixedly connected to the wire wheel seat D-1, the transmission guide bearing D-4 is sleeved on the transmission guide wheel shaft D-5, and the transmission guide wire wheel D-3 is fixed on the outer ring. Other components and connection relationships are the same as any one of the specific implementation modes 1 to 4.

[0025] The transmission guide wheel shaft D-5 of this embodiment is located in the hole of the wire wheel seat D-1, the transmission guide bearing D-4 is located on the transmission guide wheel shaft D-5, the transmission guide wire wheel D-3 is located on the transmission guide bearing D-4, and the transmission guide wheel cover D-2 is fixed to the wire wheel seat D-1 by tightening the bolts.

[0026] Taking the left side of the tension rope G as the first end, the connection direction of each component is explained. The tension rope G output from the upper left hole of the double-slot wire wheel assembly of the driving system is then input into the entrance below the single-slot wire wheel through the auxiliary guide wheel, and finally output from the shell of the anesthesia airway auxiliary management device from above the single-slot wire wheel; after passing through the left buckle part of the mask B-7, it returns to the shell of the anesthesia airway auxiliary management device, passes through the two single-slot wire wheel assemblies, and outputs from the upper right hole of the shell of the anesthesia airway auxiliary management device; after passing through the right buckle part of the mask B-7, it returns to the shell of the anesthesia airway auxiliary management device and inputs the lower right hole of the double-slot wire wheel assembly of the driving system. As a rope, the tension rope G is buckled on both sides of the mask B-7, so that the force on both sides of the mask is the same, ensuring the effect of mask buckling and avoiding the problem of mask leakage.

[0027] Specific implementation method six: Combination Figure 1 and Figure 2To explain this embodiment, the transmission system of this embodiment also includes an auxiliary wire wheel assembly F, which is installed between the single-line groove wire wheel assembly D and the drive system B to change the position and angle of the tension rope G entering the drive system B. Specifically, the head end and the tail end of the tension rope G entering the double-line groove wire wheel B-3 of the drive system B are respectively tangent to the double-line groove wire wheel B-3, and are symmetrically distributed on the left and right sides of the double-line groove wire wheel B-3. Such a design can ensure that the head and tail ends of the tension rope G are subjected to the same force, thereby increasing the service life of the tension rope G. The other components and connection relationships are the same as any one of the specific embodiments one to five. Of course, in order to achieve this purpose, it is also possible not to use the auxiliary wire wheel assembly F, but to increase the height of the single-line groove wire wheel assembly D on the left or right side so that its outlet end is tangent to the upper part of the double-line groove wire wheel B-3.

[0028] Specific implementation method seven: Combination Figure 1 and Figure 2 To explain this embodiment, the tension rope G of this embodiment includes three sections of steel wire rope and two sections of wire rope, which are connected into one rope in the order of "steel wire rope-wire rope-steel wire rope-wire rope-steel wire rope" to ensure the same force, wherein the two sections of wire rope are buckled on the mask B-7. The three sections of steel wire rope here refer to those that can be divided into three sections. It can be understood that the steel wire rope connected to the double-slot wire pulley B-3 can be one or two. When there are two, they are respectively connected to the double-slot wire pulley B-3, for example, fixedly connected in the manner of specific embodiment three; when there is one, the middle part needs to be fixedly connected to the double-slot wire pulley B-3, and it is only necessary to ensure that the length of the steel wire rope leaking outside when the double-slot wire pulley B-3 rotates in one direction is reduced, and the length of the steel wire rope leaking outside is increased when it rotates in the opposite direction. The other components and connection relationships are the same as any one of specific embodiments one to six. This design combines the line rope and the steel wire rope into a tension rope G, which avoids the contact between the steel wire rope and the patient's face and causes adverse consequences such as redness and swelling of the patient's face. On the other hand, since the line rope has a certain elasticity, it can also improve the flexibility of buckling the line rope to the mask.

[0029] Specific implementation method eight: Combination Figure 1 and Figure 2 To explain this embodiment, hooks are provided at the four connection points between the two sections of wire rope and the three sections of steel wire rope. This arrangement facilitates the connection between the three sections of steel wire rope and the two sections of wire rope. The other components and connection relationships are the same as any one of the specific embodiments 1 to 7.

[0030] Specific implementation method nine: Combination Figure 1 and Figure 2To explain this embodiment, the mask B-7 of this embodiment includes a mask body B-7-1, a connecting frame B-7-3 and a limiting column B-7-2, and the tension rope G is buckled in the groove formed by the limiting column B-7-2 and the connecting frame B-7-3. The mask of this embodiment is a conventional medical oxygen mask. The tension rope G is buckled in this way to facilitate adaptation to existing masks. The structure of the existing mask is used to limit the two sections of the rope to prevent the rope from falling on the mask. At the same time, it can also ensure that the tension on the mask is balanced when driven by the drive system. There is no need to modify the oxygen mask, which can reduce costs and improve the versatility of the device. The other components and connection relationships are the same as any one of the specific embodiments one to eight.

[0031] Specific implementation method ten: Combination Figures 1 to 4 This embodiment is described. This embodiment provides an anesthesia airway auxiliary management device, including a mask fastening system and two flexible arms M, which are installed on the left and right sides of the mask fastening system. The mask fastening system of this embodiment is the same as any one of the above-mentioned specific embodiments 1 to 9.

[0032] Working principle of the present invention:

[0033] like Figures 1 to 3 As shown, the tightening motor B-1 is fastened to the tightening motor base B-2 by motor bolts, and the motor output shaft of the tightening motor B-1 passes through the center hole of the double-slot guide wheel B-3, driving the double-slot guide wheel B-3 to rotate. The first tightening wire rope E-1 is wound in the front and rear grooves of the double-slot guide wheel B-3, and the rotation of the tightening motor B-1 drives the first tightening wire rope E-1 to move.

[0034] The first tightening wire rope E-1 output from the upper left hole of the double-slot guide wheel B-3 is then input into the entrance below the single-slot guide wheel assembly D through the auxiliary guide wheel assembly F, and finally output from the top of the single-slot guide wheel assembly D to the shell of the anesthesia airway auxiliary management device.

[0035] The first tightening wire rope E-1 output from the lower right hole of the double-slot guide wheel B-3 is input into the entrance below the single-slot guide wheel assembly D, and finally output from the top of the single-slot guide wheel assembly D to the shell of the anesthesia airway auxiliary management device.

[0036] The second tightening wire rope E-2 passes through the remaining two single-slot wire pulley assemblies D and is output from the left and right holes corresponding to the housing of the anesthesia airway auxiliary management device.

[0037] One end of the first tightening wire rope E-1 and one end of the second tightening wire rope E-2 output on the left side are connected to the two ends of a wire rope on the left side, and the other end of the first tightening wire rope E-1 and the other end of the second tightening wire rope E-2 output on the right side are connected to the two ends of another wire rope on the right side.

[0038] When the tightening motor B-1 rotates, it drives the double-slot guide wheel B-3 to rotate. Since the radius of the double-slot guide wheel B-3 is consistent, the distances of the ends of the wire ropes extending on the left and right sides of the first tightening wire rope E-1 are also equal. At the same time, the wire ropes on the left and right sides are respectively connected to the wire ropes on the buckling mask, and the wire ropes are then connected to the second tightening wire rope E-2 on the other side wrapped around the two single-slot wire wheel assemblies D to form a complete rope, which ensures the consistency of the force on the wire ropes. Therefore, the consistency of the force on the left and right sides of the buckling mask is also guaranteed.

[0039] like Figure 2 As shown, the transmission guide wheel shaft D-5 of the single-slot wire wheel assembly D of the mask fastening system is located in the hole of the wire wheel seat D-1, the transmission guide bearing D-4 is located on the transmission guide wheel shaft D-5, the transmission guide wire wheel D-3 is located on the transmission guide bearing D-4, and the transmission guide wheel cover D-2 is fixed to the wire wheel seat D-1 by tightening bolts. The wire rope passes through the hole of the transmission guide wheel cover D-2, is wound around the transmission guide wire wheel D-3, and passes through another hole of the transmission guide wheel cover D-2 to realize the steering of the wire rope.

[0040] like Figure 3 As shown, the tightening motor B-1 is fastened to the tightening motor seat B-2 by the motor bolts, the output shaft of the tightening motor B-1 passes through the center hole of the double-slot guide wheel B-3-2, and the tightening motor B-1 and the double-slot guide wheel B-3-2 are fastened by the top screw, and then the motor shaft drives the double-slot guide wheel B-3-3 to rotate. The two ends of the first tightening wire rope E-1 are wound in the front and rear grooves of the double-slot guide wheel B-3-2, and the rope end penetrates into the rope hole of the wire groove and is locked at the position through the rope hole, and then the left and right wire ropes are connected to the double-slot guide wheel B-3-3. After the wire ropes are connected, the double-slot guide wheel cover B-4 is fastened to the tightening motor B-1 with the fastening bolts, and the left wire rope passes through the left hole of the transmission guide wheel cover D-2, and the right wire rope passes through the right hole of the transmission guide wheel cover D-2. At this time, the rotation of the tightening motor B-1 can drive the wire rope wrapped around the front and rear grooves of the double-groove guide wheel B-3-2 to move.

[0041] like Figure 1As shown, four steel wire rope interfaces are output from the transmission part of the mask fastening system. A steel wire rope on the left side is wound in the left single-line groove wire pulley assembly D and output from the left front hole of the anesthesia airway auxiliary management device housing; a steel wire rope 5 on the right side is wound in the right single-line groove wire pulley assembly D and output from the right front hole of the anesthesia airway auxiliary management device housing; a steel wire rope 5 on the rear side passes through two single-line groove wire pulley assemblies D and is output from the left front hole and the right front hole of the anesthesia airway auxiliary management device housing respectively. There are rings connected to the steel wire ropes at the interfaces passing through the four steel wire ropes 5, and these rings are respectively connected to the hooks at the ends of the wire ropes hung on the oxygen mask B-7. When the steel wire rope 5 is tightened, it also drives the hanging wire rope to tighten the mask B-7, and when the steel wire rope is loosened, it also drives the hanging wire rope to loosen the mask B-7.

Claims

1. A mask fastening system, characterized in that: It comprises a driving system (B), a plurality of transmission systems, a mask (B-7), a tensioning rope (G) and a shell (C), wherein the driving system (B) and the plurality of transmission systems are installed in the shell (C), the tensioning rope (G) is buckled on the mask (B-7) and extends into the shell (C), passes through the plurality of transmission systems, and finally both ends are accommodated in the driving system (B), the driving system (B) drives the front and rear ends of the tensioning rope (G) to move so that the length of the tensioning rope (G) outside the driving system (B) changes, which is then converted into a change in the magnitude of the force of the tensioning rope (G) buckling the mask (B-7); When tightened, the tension applied to the tightening rope (G) at all locations outside the driving system (B) is the same; The driving system (B) comprises a buckling motor (B-1), a buckling motor seat (B-2) and a double-slot guide wheel (B-3), wherein the buckling motor (B-1) is mounted on the buckling motor seat (B-2), and the double-slot guide wheel (B-3) is fixedly connected to the output shaft of the buckling motor (B-1); The plurality of transmission systems are all single-slot wire pulley assemblies (D); The transmission system further comprises an auxiliary wire wheel assembly (F), which is installed between the single-slot wire wheel assembly (D) and the driving system (B) to change the position and angle of the tension rope (G) entering the driving system (B), so that the head end and the tail end of the tension rope (G) of the double-slot wire wheel (B-3) entering the driving system (B) are respectively tangent to the double-slot wire wheel (B-3), and are symmetrically distributed on the left and right sides of the double-slot wire wheel (B-3); The tension rope (G) comprises three sections of steel wire rope and two sections of line rope, which are connected into one rope in the order of "steel wire rope-line rope-steel wire rope-line rope-steel wire rope" to ensure the same force, wherein the two sections of line rope are buckled on the mask (B-7); The steel wire ropes at both ends of the tension rope (G) are led out from the double-slot guide wheel (B-3), pass through the auxiliary wire wheel assembly (F) and the single-slot wire wheel assembly (D), and are finally connected to the rope on the mask (B-7).

2. The mask fastening system according to claim 1, characterized in that: The multiple transmission systems are installed in the shell (C) in a rectangular array, and the mask (B-7) is located above the middle of the rectangular array.

3. The mask fastening system according to claim 1, characterized in that: The driving system (B) also includes a double-slot guide wheel cover (B-4) and a guide wheel locking block (B-5), wherein the double-slot guide wheel cover (B-4) is buckled on the locking motor seat (B-2) to cover the double-slot guide wheel (B-3), and the guide wheel locking block (B-5) is installed between the double-slot guide wheel (B-3) and the double-slot guide wheel cover (B-4) to fix the double-slot guide wheel (B-3) and the output shaft of the locking motor (B-1).

4. The mask fastening system according to claim 3, characterized in that: The double-slot guide wheel cover (B-4) is provided with two upper and lower parallel tension rope (G) inlets and outlets.

5. The mask fastening system according to claim 4, characterized in that: The single-slot wire wheel assembly (D) comprises a wire wheel seat (D-1), a transmission guide wire wheel (D-3), a transmission guide bearing (D-4) and a transmission guide wheel shaft (D-5). The transmission guide wheel shaft (D-5) is fixedly connected to the wire wheel seat (D-1), the transmission guide bearing (D-4) is sleeved on the transmission guide wheel shaft (D-5), and the transmission guide wire wheel (D-3) is fixed on the outer ring.

6. The mask fastening system according to claim 5, characterized in that: Hooks are provided at four connection points between the two sections of wire rope and the three sections of steel wire rope.

7. The mask fastening system according to claim 1, characterized in that: The mask (B-7) comprises a mask body (B-7-1), a connecting frame (B-7-3) and a limiting column (B-7-2), and the tightening rope (G) is buckled in a groove formed by the limiting column (B-7-2) and the connecting frame (B-7-3).

8. An anesthesia airway auxiliary management device, characterized in that: comprising a mask fastening system as claimed in any one of claims 1 to 7 and two flexible arms (M), The two flexible arms (M) are mounted on the left and right sides of the mask fastening system.

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