Automatic ear canal cleaning device integrating negative pressure suction and micro water flushing

Abstract

The invention provides an automatic ear canal cleaning device integrating negative pressure suction and micro-water flushing, and belongs to the field of medical machinery, the automatic ear canal cleaning device comprises two cleaning frames which are bilaterally symmetrical, and by conducting power-on and power-off control on each electromagnet of an electromagnet set, iron blocks are locked and limited at different positions, so that the cleaning efficiency is improved; the cleaning rod is aligned with the ear canal through cooperation with rotation of the rotating adjusting frame, the cleaning rod can be preliminarily limited, the annular air bag is inflated through the micro air pump, the inlet of the ear canal is gently supported and sealed, the Led lamps distributed in a circumferential array mode are fixed to the head of the adjusting frame, and the cleaning rod is fixedly connected with the ToF sensor. The head of the cleaning rod is fixedly connected with a plurality of guide soft rubber pads which are distributed in a circumferential array mode, lighting is conducted through the Led lamp, the ToF sensor can monitor the distance between the cleaning rod and the tympanic membrane, tympanic membrane damage is avoided, normal saline with a softening agent is sprayed to the inner wall of the auditory meatus in a pulse mode through the clean water pump, and after guiding of the guide soft rubber pads is matched, the auditory meatus can be cleaned. And cerumen mixed liquid is sucked out through the sewage pump.

Description

Technical Field

[0001] This invention relates to the field of medical devices, specifically to an automated ear canal cleaning device that integrates negative pressure suction and micro-water rinsing. Background Technology

[0002] Traditional methods of cleaning the external auditory canal, primarily relying on forceps, irrigation, or vacuum aspirators, have significant drawbacks: rigid instruments can easily damage the ear canal mucosa, especially failing to thoroughly remove deep earwax, particularly in curved ear canals; irrigation methods often leave liquid residue, posing a risk of infection, and are inefficient at removing attached earwax (such as hardened or oily earwax). While existing vacuum aspirators can partially solve the problem, their operation requires manual control by a professional physician, leading to issues such as inaccurate positioning and potential damage to the tympanic membrane from excessive suction. Furthermore, most cleaning devices on the market employ invasive designs, lacking adaptability to the anatomical structure of the ear canal. For example, they fail to address issues such as insufficient sealing at the ear canal entrance leading to liquid leakage, or rely on complex electromechanical systems resulting in high costs, hindering their widespread adoption in home or primary healthcare settings.

[0003] In recent years, some studies have attempted to combine micro-water rinsing and negative pressure suction to propose an integrated ear canal rinsing and suction device. However, its mechanical propulsion mechanism lacks precise positioning capabilities, still relying on manual depth judgment, which can easily damage the eardrum. Other methods utilize flexible endoscopes for guided cleaning, but these are structurally complex and require continuous manual operation, failing to achieve the convenience of "wear and use immediately." Furthermore, existing technologies lack sufficient physical guidance mechanisms for earwax, leaving debris easily trapped in the ear canal folds after rinsing. Therefore, there is an urgent need for an integrated ear canal cleaning device that combines automated positioning, safe sealing, and efficient removal, lowering the operational threshold through intelligent design while ensuring minimal damage to the ear canal mucosa and eardrum. Summary of the Invention

[0004] The purpose of this invention is to provide an automated ear canal cleaning device that integrates negative pressure suction and micro-water rinsing, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automated ear canal cleaning device integrating negative pressure suction and micro-water rinsing, comprising two symmetrical cleaning frames, a wearing frame fixedly connected between the cleaning frames, each cleaning frame having a through hole, a bearing fixedly connected to the cleaning frame within the through hole, an adjusting frame fixedly connected to the inner ring of the bearing, and two symmetrical sets of electromagnets fixedly connected within the adjusting frame, an iron block slidably connected to the adjusting frame, and locking and limiting the iron block at different positions by controlling the on / off state of each electromagnet in the electromagnet set, a cleaning rod slidably connected to the iron block, a sliding cylinder slidably connected to the cleaning rod, an annular airbag fixedly connected to the sliding cylinder, a limiting groove on the iron block, and a sliding frame slidably connected to the adjusting frame, the sliding frame being divided into left and right parts of the iron block. The sliding frame is rotatably connected to a threaded rod passing through the limiting groove. A miniature air pump is fixedly connected to the upper end face of the adjusting frame. An inflation tube passing through the limiting groove is connected between the miniature air pump and the annular airbag. A threaded block is fixedly connected to the cleaning rod. The threaded block is threadedly connected to the threaded rod. After the cleaning frame is worn on the ear, the position of the iron block is adjusted by controlling the electromagnet group to turn on and off. The cleaning rod is aligned with the ear canal by rotating the adjusting frame. After the electromagnet group is energized, the cleaning rod is initially limited. The cleaning rod is moved by rotating the threaded rod, moving the annular airbag to the entrance of the ear canal. The miniature air pump inflates the annular airbag, gently opening and sealing the entrance of the ear canal to prevent liquid leakage, while further limiting the cleaning rod. A wastewater rigid pipe is fixedly connected inside the cleaning rod, and a clean water rigid pipe is fixedly connected inside the wastewater rigid pipe. The wastewater rigid pipe is coaxially aligned with the cleaning rod and has multiple second suction holes arranged in a circumferential array. The cleaning rod has multiple first suction holes aligned with the second suction holes. Three sprayers arranged in a circumferential array are fixedly connected to the head of the cleaning rod, and connecting pipes are fixedly connected between the sprayers and the clean water rigid pipe. An LED light arranged in a circumferential array is fixedly connected to the head of the adjusting bracket. A ToF sensor is fixedly connected to the cleaning rod. The device is fixedly connected to multiple guide rubber pads arranged in a circumferential array. The guide rubber pads are located between every two first suction holes. A sewage pump and a clean water pump are fixedly connected to the end of the cleaning rod. The sewage pump is connected to the sewage hard pipe, and the clean water pump is connected to the clean water hard pipe, thereby providing illumination through the LED light. The ToF sensor can monitor the distance to the eardrum to avoid damaging the eardrum. The clean water pump uses physiological saline containing softening agent to spray into the inner wall of the ear canal in a pulse form. After being guided by the guide rubber pads, the cerumen mixture is sucked out by the sewage pump.

[0006] Preferably, the sliding frame is fixedly connected to a motor, the lithium battery is poweredly connected to the threaded rod, and the motor can drive the threaded rod to rotate; Preferably, each cleaning rack has two symmetrical arc-shaped grooves, with a cleaning solution box fixedly engaged in the upper arc-shaped groove. The cleaning solution box is fixedly connected to a first socket communicating with the inside of the cleaning solution box. A one-way valve is fixedly connected in the first socket. The water pump is fixedly connected to a water hose that can be inserted into the first socket, so that the water hose can be pulled out to add saline solution containing softener to the cleaning solution box, and the water pump can be used to extract the solution after the water hose is inserted. Preferably, a wastewater box is fixedly snapped into the lower arc-shaped groove, the wastewater box is fixedly connected to a second socket, and the wastewater pump is fixedly connected to a wastewater hose that can be inserted into the wastewater box, so that the wastewater containing earwax extracted during cleaning can be discharged into the wastewater box, and the wastewater hose can be pulled out to pour out the wastewater in the wastewater box; Preferably, each of the cleaning racks is provided with a groove, and a central controller is fixedly connected in each groove, the central controller performing automated control; Preferably, a lithium battery is fixedly connected in each of the grooves, and each cleaning rack is provided with a wiring hole that connects the groove and the through hole. Wiring is performed through the wiring hole, and the lithium battery supplies power to the electrical devices. Preferably, each of the cleaning racks is fixedly connected to a soft rubber pad, which improves wearing comfort and enhances the stability of the device during cleaning.

[0007] Compared with the prior art, the beneficial effects of the present invention are: This invention features a cleaning frame, a soft rubber pad, and an adjustment frame. The cleaning frame is quickly placed on the ear by wearing the device. The second suction hole is then manually moved along the adjustment frame, and the frame is rotated to precisely position the cleaning rod within the ear canal. The electromagnet assembly is energized and de-energized to fix the metal block in place. Finally, after inserting the cleaning rod head into the ear canal, a miniature air pump inflates the annular airbag, gently opening the ear canal entrance and sealing it to prevent leakage. This allows for separate cleaning of the left and right ears, with quick positioning and sealing.

[0008] This invention utilizes a wastewater pipe, a ToF sensor, and a sprayer. A rotating threaded rod moves a cleaning rod along the ear canal, while a water pump sprays physiological saline containing a softening agent onto the inner wall of the ear canal in a pulsed spray pattern. The movement speed is controlled to ensure that the guide pad remains in contact with the ear canal wall for more than a few seconds, ensuring effective softening. The softened earwax is guided along the guide pad to the first suction hole, where the wastewater pump draws the liquid and earwax mixture out through the second suction hole. Simultaneously, LED lighting illuminates the area, and the ToF sensor controls the distance from the eardrum to prevent damage. This solves the problems of deep earwax being difficult to remove completely and the risk of infection from rinsing methods that can leave liquid residue. It also offers high efficiency in removing attached earwax (such as hardened or oily earwax), providing automated ear canal cleaning. Attached Figure Description

[0009] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 for Figure 1 The right view; Figure 3 for Figure 2 A schematic diagram of the AA cross-section; Figure 4 for Figure 2 BB cross-sectional diagram; Figure 5 for Figure 3 A magnified view of a portion of the image; Figure 6 for Figure 4 A magnified view of a portion of the image; Figure 7 This is a three-dimensional schematic diagram of the guide rubber pad of the present invention; Figure 8 This is a three-dimensional schematic diagram of the arc-shaped groove in this invention; Figure 9 This is a three-dimensional schematic diagram of the sewage hose of the present invention; Figure 10 This is a three-dimensional schematic diagram of the adjustment frame of the present invention; Figure 11 This is a three-dimensional schematic diagram of the cleaning rod of the present invention; Figure 12 This is a three-dimensional cross-sectional schematic diagram of the cleaning rod of the present invention.

[0010] In the diagram: 100, Cleaning rack; 101, Wearing frame; 102, Soft rubber pad; 103, Cleaning rod; 104, Wastewater hose; 105, Sliding frame; 106, Cleaning solution tank; 107, Wastewater tank; 108, Through hole; 109, Adjustment frame; 110, Clean water hose; 111, Wastewater pump; 113, Groove; 114, Lithium battery; 115, Central controller; 116, Bearing; 117, Electromagnetic assembly; 118, Iron block; 119, Wastewater rigid pipe; 120, Clean water rigid pipe; 121, Clean water pump; 1 22; 123, ToF sensor; 124, LED light; 125, sprayer; 126, connecting tube; 127, first suction hole; 128, second suction hole; 129, slide tube; 130, annular airbag; 131, wiring hole; 133, inflation tube; 134, guide soft rubber pad; 135, arc groove; 136, first socket; 137, second socket; 138, miniature air pump; 139, limiting groove; 140, threaded rod; 141, motor; 142, threaded block; 143, one-way valve. Detailed Implementation

[0011] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0012] Example 1: Please see Figure 1-12This invention provides a technical solution: an automated ear canal cleaning device integrating negative pressure suction and micro-water rinsing, comprising two symmetrical cleaning frames 100, with a wearing frame 101 fixedly connected between the cleaning frames 100. Each cleaning frame 100 has a through hole 108, and a bearing 116 fixedly connected to the cleaning frame 100 is provided in the through hole 108. An adjusting frame 109 is fixedly connected to the inner ring of the bearing 116, and two sets of electromagnets 117 symmetrically connected are fixedly connected in the adjusting frame 109. A sliding iron block 118 is slidably connected to the electromagnet assembly 117. By controlling the on / off state of each electromagnet, the iron block 118 can be locked and limited to different positions. A cleaning rod 103 is slidably connected to the iron block 118, and a sliding cylinder 129 is slidably connected to the cleaning rod 103. An annular airbag 130 is fixedly connected to the sliding cylinder 129. The iron block 118 is provided with a limiting groove 139. A sliding frame 105 is slidably connected to the adjusting frame 109, and the sliding frame 105 is divided into left and right parts for the iron block 118. The sliding frame 105 is rotatably connected to a threaded rod 140 passing through the limiting groove 139. A miniature air pump 138 is fixedly connected to the upper end face of the adjusting frame 109. An inflation tube 133 passing through the limiting groove 139 connects the miniature air pump 138 and the annular airbag 130. A threaded block 142 is fixedly connected to the cleaning rod 103. The threaded block 142 is threadedly connected to the threaded rod 140. After the cleaning frame 100 is worn on the ear, the electromagnet assembly 117 is de-energized, and the iron block 118 is moved to adjust the ear. Positioning is achieved by rotating the adjustment bracket 109 to align the cleaning rod 103 with the ear canal. After energizing the electromagnet assembly 117, the cleaning rod 103 is initially positioned. Rotating the threaded rod 140 moves the cleaning rod 103, moving the annular airbag 130 to the ear canal entrance. The micro air pump 138 then inflates the annular airbag 130, gently lifting and sealing the ear canal entrance to prevent liquid leakage, while further positioning the cleaning rod 103. The sliding frame 105 is fixedly connected to a motor 141, and the lithium battery 114 is poweredly connected to the threaded rod 140. The motor 141 can drive the threaded rod 140 to rotate.

[0013] Example 2: Please see Figure 1-12 In order to carry out thorough micro-water flushing and negative pressure suction, sewage rigid pipe 119, sprayer 125 and clean water rigid pipe 120 are installed; A wastewater rigid pipe 119 is fixedly connected inside the cleaning rod 103, and a clean water rigid pipe 120 is fixedly connected inside the wastewater rigid pipe 119. The wastewater rigid pipe 119 is coaxially aligned with the cleaning rod 103, and the wastewater rigid pipe 119 has a plurality of second suction holes 128 arranged in a circumferential array. The cleaning rod 103 has a plurality of first suction holes 127 aligned with the second suction holes 128. Three sprayers 125 arranged in a circumferential array are fixedly connected to the head of the cleaning rod 103. A connecting pipe 126 is fixedly connected between the sprayers 125 and the clean water rigid pipe 120. An LED light 124 arranged in a circumferential array is fixedly connected to the head of the adjusting bracket 109. A ToF sensor 123 is fixedly connected to the cleaning rod 103. The head of the cleaning rod 103 is fixedly connected to a plurality of guide soft rubber pads 134 arranged in a circumferential array. The guide soft rubber pads 134 are located between every two first suction holes 127. The tail of the cleaning rod 103 is fixedly connected to a sewage pump 111 and a clean water pump 121. The sewage pump 111 is connected to the sewage hard pipe 119, and the clean water pump 121 is connected to the clean water hard pipe 120, so that the LED light 124 can provide illumination. The ToF sensor 123 can monitor the distance to the eardrum to avoid damaging the eardrum. The clean water pump 121 sprays physiological saline with softening agent into the inner wall of the ear canal in a pulse form. After being guided by the guide soft rubber pads 134, the cerumen mixture is sucked out by the sewage pump 111. Each cleaning rack 100 is provided with two symmetrical arc-shaped grooves 135. A cleaning liquid box 106 is fixedly snapped into the upper arc-shaped groove 135. The cleaning liquid box 106 is fixedly connected to a first socket 136 communicating with the inside of the cleaning liquid box 106. A one-way valve 143 is fixedly connected to the first socket 136. A clean water pump 121 is fixedly connected to a clean water hose 110 that can be inserted into the first socket 136. The clean water hose 110 can be pulled out to add saline solution containing softener to the cleaning liquid box 106, and the clean water pump 121 can be used to extract the solution after the clean water hose 110 is inserted. A wastewater box 107 is fixedly snapped into the lower arc-shaped groove 135. The wastewater box 107 is fixedly connected to a second socket 137. The wastewater pump 111 is fixedly connected to a wastewater hose 104 that can be inserted into the wastewater box 107, so that the wastewater containing earwax extracted during cleaning can be discharged into the wastewater box 107, and the wastewater hose 104 can be pulled out to pour out the wastewater in the wastewater box 107. Each cleaning rack 100 is provided with a groove 113, and a central controller 115 is fixedly connected in each groove 113. The central controller 115 performs automated control. Each of the grooves 113 is fixedly connected to a lithium battery 114, and each cleaning rack 100 is provided with a wiring hole 131 that connects the groove 113 and the through hole 108. Wiring is performed through the wiring hole 131, and the lithium battery 114 supplies power to the electrical devices. Each of the cleaning racks 100 is fixedly connected to a soft rubber pad 102, which improves wearing comfort and enhances the stability of the device during cleaning.

[0014] Working principle: In use, the saline solution containing softener is first drawn into the cleaning solution box 106 through the first socket 136, the one-way valve 143 prevents leakage, and one end of the clean water hose 110 is inserted into the first socket 136, and the other end of the wastewater hose 104 is inserted into the second socket 137. Then, the two cleaning frames 100 are worn on the head. After the electromagnet assembly 117 is de-energized by the central controller 115, it loses its magnetism. The cleaning rod 103 is manually moved, and the sliding frame 105 and the iron block 118 are moved simultaneously. With the rotation of the adjustment frame 109, the cleaning rod 103 is adjusted to the position aligned with the ear canal. The motor 141 is started to drive the threaded rod 140 to rotate, which moves the cleaning rod 103 and moves the annular airbag 130 to the entrance of the ear canal. The micro air pump 138 introduces air into the annular airbag 130 through the inflation tube 133 to gently open the entrance of the ear canal, reducing the foreign body sensation during subsequent cleaning. At the same time, it seals the ear canal to prevent liquid leakage and further positions the cleaning rod 103. The electromagnet assembly 117 is re-energized to lock the iron block 118, further limiting the position of the cleaning rod 103. This allows for convenient wearing and ensures a tight seal, preparing for subsequent automatic cleaning.

[0015] Then, the automatic start motor 141 drives the cleaning rod 103 to slowly move into the ear canal. The guide soft rubber pad 134 gently moves against the inner wall of the ear canal, and the LED light 124 is turned on for illumination. The ToF sensor 123 monitors the position of the eardrum. During movement, the clean water pump 121 and the wastewater pump 111 are activated. The clean water pump 121 draws water from the cleaning solution box 106 from the clean water hose 110 into the clean water rigid tube 120 and then into the sprayer 125 through the connecting tube 126. The water is then sprayed in a mist-like pulse form onto the inner wall of the ear canal, controlling the movement of the cleaning rod 103. The speed ensures that the earwax can be softened for more than 30 seconds, thereby ensuring that the earwax can be guided by the guide soft rubber pad 134 into the first suction hole 127, and then sucked into the sewage hard tube 119 through the second suction hole 128. Finally, it is pulled out from the sewage hose 104 into the sewage box 107 for collection. The ToF sensor 123 can prevent the cleaning rod 103 from contacting the eardrum and avoid damaging the eardrum. This solves the problems of deep earwax being difficult to remove completely and the risk of liquid residue and infection caused by rinsing. It also has a high removal efficiency for attached earwax (such as hardened or oily earwax) and performs automated ear canal cleaning.

[0016] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0017] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An automated ear canal cleaning device integrating negative pressure suction and micro-water rinsing, comprising two symmetrically arranged cleaning frames (100), characterized in that: A wearing frame (101) is fixedly connected between the cleaning frames (100). Each cleaning frame (100) is provided with a through hole (108). A bearing (116) fixedly connected to the cleaning frame (100) is provided in the through hole (108). An adjusting frame (109) is fixedly connected to the inner ring of the bearing (116). Two sets of electromagnets (117) are fixedly connected to the adjusting frame (109) in an upper and lower symmetrical manner. An iron block (118) is slidably connected to the adjusting frame (109). By controlling the on and off of each electromagnet in the electromagnet set (117), the iron block (118) can be locked and limited at different positions. A cleaning rod (103) is slidably connected to the iron block (118). A slide cylinder (129) is slidably connected to the cleaning rod (103). The slide cylinder (129) is fixedly connected to an annular airbag (130), the iron block (118) is provided with a limiting groove (139), the adjusting frame (109) is slidably connected to a sliding frame (105), the sliding frame (105) is divided into left and right parts of the iron block (118), the sliding frame (105) is rotatably connected to a threaded rod (140) passing through the limiting groove (139), the upper end face of the adjusting frame (109) is fixedly connected to a micro air pump (138), the micro air pump (138) and the annular airbag (130) are connected to an inflation tube (133) passing through the limiting groove (139), the cleaning rod (103) is fixedly connected to a threaded block (142), the threaded block (142) is threadedly connected to the threaded rod (140); A sewage rigid pipe (119) is fixedly connected inside the cleaning rod (103), and a clean water rigid pipe (120) is fixedly connected inside the sewage rigid pipe (119). The sewage rigid pipe (119) is coaxially aligned with the cleaning rod (103), and the sewage rigid pipe (119) is provided with a plurality of second suction holes (128) arranged in a circumferential array. The cleaning rod (103) is provided with a plurality of first suction holes (127) aligned with the second suction holes (128). Three sprayers (125) arranged in a circumferential array are fixedly connected to the head of the cleaning rod (103), and a connecting pipe is fixedly connected between the sprayers (125) and the clean water rigid pipe (120). (126) The head of the adjustment frame (109) is fixedly connected to an LED lamp (124) arranged in a circular array. The cleaning rod (103) is fixedly connected to a ToF sensor (123). The head of the cleaning rod (103) is fixedly connected to a plurality of guide soft rubber pads (134) arranged in a circular array. The guide soft rubber pads (134) are located between every two first suction holes (127). The tail of the cleaning rod (103) is fixedly connected to a sewage pump (111) and a clean water pump (121). The sewage pump (111) is connected to the sewage hard pipe (119), and the clean water pump (121) is connected to the clean water hard pipe (120).

2. The automated ear canal cleaning device integrating negative pressure suction and micro-water rinsing according to claim 1, characterized in that: The sliding frame (105) is fixedly connected to a motor (141), the lithium battery (114) is poweredly connected to the threaded rod (140), and the motor (141) can drive the threaded rod (140) to rotate.

3. The automated ear canal cleaning device integrating negative pressure suction and micro-water rinsing according to claim 2, characterized in that: Each cleaning rack (100) is provided with two symmetrical arc-shaped grooves (135). A cleaning liquid box (106) is fixedly connected in the upper arc-shaped groove (135). The cleaning liquid box (106) is fixedly connected to a first socket (136) that communicates with the inside of the cleaning liquid box (106). A one-way valve (143) is fixedly connected in the first socket (136). The clean water pump (121) is fixedly connected to a clean water hose (110) that can be inserted into the first socket (136).

4. The automated ear canal cleaning device integrating negative pressure suction and micro-water rinsing according to claim 3, characterized in that: A sewage box (107) is fixedly connected in the lower arc groove (135), the sewage box (107) is fixedly connected to a second socket (137), and the sewage pump (111) is fixedly connected to a sewage hose (104) that can be inserted into the sewage box (107).

5. An automated ear canal cleaning device integrating negative pressure suction and micro-water rinsing according to claim 4, characterized in that: Each cleaning rack (100) is provided with a groove (113), and a central controller (115) is fixedly connected in each groove (113). The central controller (115) performs automated control.

6. An automated ear canal cleaning device integrating negative pressure suction and micro-water rinsing according to claim 5, characterized in that: Each of the grooves (113) is fixedly connected to a lithium battery (114), and each of the cleaning racks (100) is provided with a wiring hole (131) that connects the groove (113) and the through hole (108).

7. An automated ear canal cleaning device integrating negative pressure suction and micro-water rinsing according to claim 6, characterized in that: Each of the cleaning racks (100) is fixedly connected to a soft rubber pad (102), which improves wearing comfort and enhances the stability of the device during cleaning.

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