CN111700637A

CN111700637A - Bluetooth stethoscope

Info

Publication number: CN111700637A
Application number: CN202010531518.3A
Authority: CN
Inventors: 谭鑫; 刘激扬; 陈立华; 李子博; 刘强; 谢文锋
Original assignee: Changsha Yiyi Bioengineering Co ltd
Current assignee: Changsha Yiyi Bioengineering Co ltd
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2020-09-25
Anticipated expiration: 2040-06-11
Also published as: CN111700637B

Abstract

The invention discloses a Bluetooth stethoscope, which is provided with two output structures, wherein one output structure is a wireless output structure, the first output end of a mainboard is connected with a Bluetooth module, the Bluetooth module is connected with an antenna through an output connecting wire, the antenna is arranged on an antenna seat, and the antenna seat is fixedly arranged on the outer side of a shell; another way is wired output structure, and the second output of mainboard links to each other with the speaker, the speaker links to each other with built-in transaudient pipe, the connecting pipe is installed on the casing, the one end of connector is inserted and is passed the connecting pipe and link to each other with built-in transaudient pipe, the other end and the outside transaudient hose of connector link to each other. The invention has the advantages of strong adaptability and high sensitivity.

Description

Bluetooth stethoscope

Technical Field

The invention relates to the technical field of stethoscope equipment, in particular to a Bluetooth stethoscope.

Background

The stethoscope is the most commonly used diagnostic tool for doctors and is a necessary tool for doctors. In the aspect of cardiovascular, the stethoscope can be used for listening heart rate, heart sound, blood vessel noise and the like, and the stethoscope is also used for measuring blood pressure; in the aspect of a respiratory system, the stethoscope can be used for listening to the respiratory sound of the lung and distinguishing pathological changes in the lung; can also be used for auscultating the heart sounds of the fetus and the like; the stethoscope is a necessary tool for distinguishing vital signs such as heartbeat, blood pressure and the like.

The stethoscope sold in the market at present only has a single output mode, and is very inconvenient in the using process. For example, wireless transmission may be desirable for use in remote, remote diagnostic or instructional procedures. But it is convenient to use wired output when making direct diagnosis with the patient. If two output structures are provided at the same time, the selection can be conveniently carried out, or the combination of the two output structures can be adopted to combine the waveform and data of digital wireless transmission with the sound of analog transmission, and the comparison and comparison are carried out to eliminate some interference signals, thereby further improving the accuracy of diagnosis.

In addition, the shell of the existing stethoscope does not have a waterproof sealing structure, and has the main defects that the shell cannot be sprayed and cleaned by alcohol, water or a disinfectant, and cannot be directly immersed into the alcohol, the water or the disinfectant for disinfection. At present, the novel coronavirus is infected in large scale and outbreak in large scale in the world, and the number of people infected in the world is more than two million. Since the novel coronavirus has extremely strong infectivity and can be rapidly transmitted by three ways of respiratory droplet transmission, close contact transmission and aerosol transmission, after a patient is auscultated by using a Bluetooth stethoscope, the patient needs to be strictly disinfected by a disinfectant or alcohol, and the stethoscope is required to have good waterproof sealing performance.

Secondly, what current bluetooth stethoscope generally adopted is buzzer sensor, and this kind of sensor can turn into the signal of telecommunication with sound, but current sensor utensil has the reaction delay time long, the poor shortcoming of sensitivity, can not be used to some use occasions of high accuracy high demand.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a novel Bluetooth stethoscope.

The invention is realized by the following technical scheme:

the utility model provides a bluetooth stethoscope, includes casing, cap, sensor, mainboard, battery, bluetooth module, the cap is installed on the casing, form a cavity between cap and the casing, the sensor is installed in the inboard of cap, mainboard and battery are installed to the inboard of casing, the sensor links to each other with the mainboard, the battery is connected with the mainboard electricity, provides the electric energy for the mainboard, its characterized in that: the main board is provided with two output structures, one is a wireless output structure, and the other is a wired output structure; the wireless output structure comprises a Bluetooth module, an output connecting wire, an antenna seat and an antenna, wherein the first output end of the mainboard is connected with the Bluetooth module, the antenna seat is fixedly arranged on the outer side surface of the shell, the rotatable antenna is arranged on the antenna seat, and the antenna is connected with the Bluetooth module through the output connecting wire; wired output structure includes speaker, built-in transaudient pipe, connecting pipe, connector, outside transaudient hose, the second output of mainboard links to each other with the speaker, the connecting pipe is installed on the casing, the left side of connecting pipe is equipped with built-in transaudient pipe, built-in transaudient pipe links to each other with the speaker, connector and connecting pipe looks adaptation, the connector inserts and passes the connecting pipe and link to each other with built-in transaudient pipe, outside transaudient hose links to each other with the connector.

Further, the antenna pedestal passes through the fix with screw on the lateral surface of casing, be equipped with sharp shape recess and bowl shape recess on the antenna pedestal, sharp shape recess and antenna looks adaptation, bowl shape recess sets up in the below of sharp shape recess and is linked together with sharp shape recess, the bottom of antenna is equipped with the rolling ball, rolling ball movable mounting is in bowl shape recess.

Further, be equipped with a plurality of annular retaining rings in the connecting pipe, the outer lane of annular retaining ring links to each other with the inner wall of connecting pipe is fixed, the inner circle of annular retaining ring is less than the external diameter of connector, the left end and the arc wall of connecting pipe link to each other, be equipped with the arc stopper of looks adaptation in the arc wall, the arc stopper links to each other with the one end stationary phase of arc pole, the other end and the rotor plate fixed connection of arc pole, the lower extreme and the sleeve of rotor plate are fixed and link to each other, sleeve movable mounting is in the axis of rotation, the sleeve becomes to rotate with the axis of rotation and is connected, the axis of rotation both ends are fixed on the mount pad, the mount pad is fixed on the mounting panel, is equipped with compression spring between mounting panel and the rotor plate, compression spring.

Furthermore, an outer retainer ring is arranged on the edge of the shell cover, a sealing internal thread is arranged on the inner side of the outer retainer ring, an inner retainer ring is arranged on the edge of the shell, a sealing external thread matched with the sealing internal thread on the outer retainer ring is arranged on the outer side of the inner retainer ring, the right end of the inner retainer ring is connected with the edge of the shell cover through an inclined connecting ring, and a first elastic layer is arranged on the connecting ring; the inner side of the shell cover is provided with an annular separation blade, a second elastic layer is arranged between the annular separation blade and the outer retaining ring and arranged on the shell cover, the inner side of the shell is provided with an inner cover, the outer side surface of the inner cover is fixedly connected with the inner retaining ring, the right side surface of the inner cover is fixedly connected with the inner side of the shell cover, the left side surface of the inner cover is provided with an annular groove, a third elastic layer is adhered in the annular groove, and the annular groove is matched with the annular separation blade on the inner side of the shell cover; an inclined first elastic ring is arranged on the inner side surface of the inner cover, a corresponding second elastic ring is arranged on the inner side of the shell cover, and the second elastic ring is in elastic contact connection with the first elastic ring; and a fourth elastic layer is arranged between the second elastic ring and the annular baffle and fixed on the inner side surface of the shell cover, and a fifth elastic layer is arranged between the first elastic ring and the annular groove and fixed on the left side surface of the inner cover.

Further, fixed bracelet is installed in the outside of casing, the casing is equipped with the waterproof cover of rubber with the junction of cap, the outside of the waterproof cover of rubber is equipped with viscidity subsides or ligature area.

Further, the sensor is a resonant magnetic suspension sensor, and the resonant magnetic suspension sensor comprises a vibrating reed, a bowl-shaped cover plate, a wedge-shaped air nozzle, a resonance box, a first resonant sheet, a magnetic connecting rod, a reversed polarity magnetic block, a second resonant sheet and a piezoresistor; the vibrating plate is arranged in the center of the shell cover, the bowl-shaped cover plate is fixed on the right side surface of the shell cover, a vibrating cavity is formed between the bowl-shaped cover plate and the vibrating plate, the center of the bowl-shaped cover plate is provided with a wedge-shaped air tap with two open ends, the left end opening of the wedge-shaped air tap is larger than the right end opening, a resonance box is arranged on the right side of the wedge-shaped air tap, the resonance box is a hollow box body, a first resonance sheet is arranged on the left side wall of the resonance box, the first resonance sheet is over against the right end opening of the wedge-shaped air tap, the right side wall of the resonance box is provided with a second resonance sheet, a magnetic connecting rod is arranged between the first resonance sheet and the second resonance sheet, the left end of the magnetic connecting rod is connected with the first resonance sheet, the right end of the magnetic connecting rod is connected with the second resonance sheet, an antipolarity magnetic block with opposite magnetic poles is arranged below the magnetic connecting rod, and the right side face of the second resonance sheet is connected with the piezoresistor.

Further, the resonance box is a hollow square box body, be equipped with first circular port on the left side wall of resonance box, first resonance piece is circular, first resonance piece is located first circular port, and the internal diameter of first circular port is greater than the external diameter of first resonance piece, be equipped with the second circular port on the right side wall of resonance box, the second resonance piece also is circular, the second resonance piece is located the second circular port, and the internal diameter of second circular port is greater than the external diameter of second resonance piece.

Further, the magnetic connecting rod is a slender square rod, the upper half part of the magnetic connecting rod is an N pole, and the lower half part of the magnetic connecting rod is an S pole; the magnetic block with reversed polarity is in a cuboid block structure, the upper half part of the magnetic block with reversed polarity is an S pole, and the upper half part of the magnetic block with reversed polarity is an N pole; the sum of the gravity borne by the first resonance sheet, the magnetic connecting rod and the second resonance sheet is equal to the magnetic acting force of the magnetic connecting rod by the magnetic block with the opposite polarity.

Furthermore, the wedge-shaped air tap is a wedge with a left end opening larger than a right end opening, the left end opening of the wedge-shaped air tap is circular with the diameter of 3-6mm, and the right end opening of the wedge-shaped air tap is circular with the diameter of 1-3 mm.

Furthermore, the upper part of the resonance box is connected with the lower end of an upper fixing rod, the upper end of the upper fixing rod is fixedly connected with the upper part of the shell, the lower part of the resonance box is connected with the upper end of a lower fixing rod, and the lower end of the lower fixing rod is fixedly connected with the lower part of the shell.

The invention has the following beneficial effects:

(1) the Bluetooth wireless power supply is provided with two output structures, one output structure is a wireless output structure, a first output end of a mainboard is connected with a Bluetooth module, the Bluetooth module is connected with an antenna through an output connecting wire, the antenna is arranged on an antenna seat, and the antenna seat is fixedly arranged on the outer side of a shell; another way is wired output structure, and the second output of mainboard links to each other with the speaker, the speaker links to each other with built-in transaudient pipe, the right side of built-in transaudient pipe is equipped with the connecting pipe, and the connecting pipe is passed to the one end of connector and built-in transaudient pipe links to each other, the other end and the outside transaudient hose of connector link to each other. The invention can conveniently select, and can also adopt a mode of combining the two, combine the waveform and data of digital wireless transmission with signals of wired analog transmission, compare with each other, eliminate some interference signals, and can further improve the accuracy of diagnosis. The invention has strong adaptability and wide application range and can improve the accuracy of diagnosis.

(2) The invention is provided with a waterproof and dustproof plug-in connection structure, when the connector is inserted through the connection pipe, the connector can push the arc plug in the arc groove to enable the arc plug, the arc rod and the rotating plate to rotate anticlockwise along the sleeve and the rotating shaft, the compression spring is compressed, and the connector penetrates through the connection pipe to push the arc plug to be inserted into the built-in sound conducting pipe; when the connector is pulled out, the compression spring rebounds to enable the rotating plate, the arc-shaped rod and the arc-shaped plug to rotate clockwise along the sleeve and the rotating shaft, and the arc-shaped plug enters the arc-shaped groove to seal the left end of the connecting pipe, so that the dustproof and waterproof effects are achieved. Meanwhile, a plurality of annular check rings are arranged in the connecting pipe, and when the connector penetrates through the inner ring of the annular check ring and is inserted into the connecting pipe, the annular check rings can further play a role in water and dust prevention.

(3) The invention is provided with six waterproof sealing structures: when the shell cover is screwed on the shell body through thread matching, the right end of the outer retainer ring can compress the first elastic layer to form a first sealing structure. The sealing internal thread on the inner side of the outer retainer ring is meshed and connected with the sealing external thread on the outer side of the inner retainer ring to form a second sealing structure; according to the invention, the second elastic layer and the annular blocking piece are arranged on the inner side surface of the shell cover, the annular groove is arranged on the left side surface of the inner cover, and when the shell cover is screwed on the shell body in a threaded fit manner, the second elastic layer on the inner side surface of the shell cover can compress the left side surface of the inner cover to form a third sealing structure; the annular blocking piece on the inner side of the shell cover can be inserted into the annular groove on the left side face of the inner cover, and the third elastic layer tightly wraps the annular blocking piece through the elastic action to form a fourth sealing structure; according to the invention, the fourth elastic layer is arranged between the second elastic ring and the annular blocking piece, the fifth elastic layer is arranged between the first elastic ring and the annular groove, and the fifth elastic layer is adhered to the left side surface of the inner cover. When the shell cover is screwed on the shell body through thread matching, the second elastic ring on the inner side surface of the shell cover can press the first elastic ring on the inner cover to form a fifth sealing structure; meanwhile, the fourth elastic layer on the inner side of the shell cover can also press the fifth elastic layer on the left side face of the inner cover, so that a sixth sealing structure is formed. The invention has good waterproof sealing performance through six different waterproof sealing structures, and can be sprayed and cleaned by alcohol, water or a disinfectant. For the novel coronavirus with extremely strong infectivity, after a stethoscope is used for diagnosing a patient, the patient can be strictly disinfected by using a disinfectant or alcohol, so that the health safety of instruments and personnel is ensured.

(4) According to the invention, the bowl-shaped cover plate is arranged on the right side surface of the shell cover, the vibration cavity is formed between the bowl-shaped cover plate and the vibrating reed, the wedge-shaped air tap with openings at two ends is arranged in the center of the bowl-shaped cover plate, the vibration generated by the vibrating reed can be converted and amplified into the air flow vibration in the wedge-shaped air tap, the right side of the wedge-shaped air tap is over against the first resonance piece on the left side wall of the resonance box, the first resonance piece is connected with the second resonance piece on the right side wall of the resonance box through the magnetic connecting rod, the magnetic connecting rod is a long and thin square rod, the upper half part of the magnetic connecting rod is an N pole, and the lower half part of. The magnetic connecting rod is provided with a reverse polarity magnetic block with opposite magnetic poles below, the reverse polarity magnetic block is of a cuboid block structure, the upper half part of the reverse polarity magnetic block is an S pole, and the upper half part of the reverse polarity magnetic block is an N pole. The sum of the gravity borne by the first resonance sheet, the magnetic connecting rod and the second resonance sheet is equal to the magnetic acting force of the magnetic connecting rod by the reversed-polarity magnetic block, so that the first resonance sheet, the magnetic connecting rod and the second resonance sheet are suspended in the resonance box. Under the action of magnetic suspension, the motion friction force during resonance is zero, so that the interference of friction noise can be effectively eliminated, the vibration resistance is reduced, the vibration sensitivity and response speed are improved, and the sensitivity and accuracy of the stethoscope are further improved. The invention has the advantages of high response speed, high sensitivity and high accuracy, and overcomes the defects of long reaction delay time and poor sensitivity in the prior art.

Drawings

Fig. 1 is a schematic structural view of embodiment 1.

Fig. 2 is a schematic structural view of example 1 after the rubber waterproof jacket is removed.

Fig. 3 is a partially enlarged view of a portion a in fig. 2.

Fig. 4 is a partially enlarged view of fig. 2 at B.

Fig. 5 is a schematic structural view of an arc-shaped groove.

Fig. 6 is a schematic structural view of the inner lid in example 1.

Fig. 7 is a partial enlarged view of fig. 2 at C.

Fig. 8 is a schematic structural view of embodiment 2.

Fig. 9 is a partial enlarged view of fig. 8 at D.

Fig. 10 is a partial enlarged view of fig. 8 at E.

Fig. 11 is a schematic structural view of a resonant magnetic levitation sensor in embodiment 2.

In the drawings: 1-housing, 2-housing cover, 3-sensor, 4-mainboard, 5-fixing screw bolt, 6-first output end, 7-second output end, 8-battery, 9-pressing plate, 10-bluetooth module, 11-antenna base, 12-antenna, 13-straight line groove, 14-spherical bowl groove, 15-rotating ball, 16-loudspeaker, 17-built-in sound tube, 18-connecting tube, 19-connector, 20-external sound tube, 21-annular retainer, 22-arc groove, 23-arc plug, 24-arc rod, 25-rotating plate, 26-sleeve, 27-rotating shaft, 28-mounting base, 29-mounting plate, 30-compression spring, 31-arc tube, 32-bottom plate, 33-connecting hole, 34-external terminal, 35-receiver, 36-external retainer, 37-inner retainer ring, 38-connecting ring, 39-first elastic layer, 40-second elastic layer, 41-third elastic layer, 42-fourth elastic layer, 43-fifth elastic layer, 44-annular baffle, 45-inner cover, 46-center hole, 47-annular groove, 48-fixing ring, 49-first elastic ring, 50-second elastic ring, 51-fixing seat, 52-arc hole, 53-rubber waterproof cover, 54-adhesive paste, 55-resonant magnetic suspension sensor, 56-vibrating plate, 57-bowl cover plate, 58-connecting edge, 59-vibrating cavity, 60-wedge air tap, 61-rubber sealing ring, 62-resonant box, 63-first circular hole, 64-first resonant plate, 65-second circular hole, 66-second resonant plate, 67-magnetic connecting rod, 68-reversed polarity magnetic block, 69-fixed block, 70-piezoresistor, 71-upper fixed rod, 72-lower fixed rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in FIGS. 1-7, a Bluetooth stethoscope comprises a shell 1, a shell cover 2, a sensor 3, a main board 4 and a battery 8. Casing 1 and cap 2 are circular, adopt stainless steel or other metal material preparation, cap 2 is installed on casing 1 through threaded connection's mode, form a cavity between cap 2 and the casing 1, sensor 3, mainboard 4, battery 8 all are located the cavity. The sensor 3 is arranged on the inner side surface of the shell cover 2 in a gluing or screw fixing mode, and the inner side surface of the shell 1 is provided with a mainboard 4 and a battery 8. The main board 4 is mounted on the inner side surface of the shell 1 through screws and fixing studs 5. The inboard welding of casing 1 has four columniform fixing stud 5, the left end of fixing stud 5 is equipped with the screw hole, be equipped with the through-hole corresponding with fixing stud 5's screw hole on four angles of mainboard 4, the screw passes through the through-hole on four angles of mainboard 4 and inserts the threaded hole of fixing stud 5, forms the screw-thread fit installation. The battery 8 is fixed on the inner side surface of the shell 1 through a pressing plate 9 and screws, the pressing plate 9 is Z-shaped, one end of the pressing plate 9 compresses the battery 8, and the other end of the pressing plate 9 is fixed on the inner side surface of the shell 1 through screws or welding. The input end of the mainboard 4 is connected with the sensor 3, and the sensor 3 adopts a buzzer sensor. The battery 8 is electrically connected with the mainboard 4 and provides electric energy for the mainboard 4. The mainboard 4 is provided with two paths of output structures, one path is a wireless output structure, and the other path is a wired output structure.

As shown in fig. 2 and fig. 3, the wireless output structure includes a bluetooth module 10, an output connection line, an antenna mount 11, and an antenna 12. Bluetooth module 10 links to each other with the first output 6 of mainboard 4, antenna pedestal 11 fixed mounting is on the lateral surface of casing 1, install rotatable antenna 12 on the antenna pedestal 11, antenna 12 passes through the output connecting wire and links to each other with Bluetooth module 10. Preferably, the antenna mount 11 is a rectangular parallelepiped block structure and is made of plastic or metal material, and the antenna mount 11 is mounted on the outer side surface of the housing 1 by welding or screw fixation. The antenna base 11 is provided with a linear groove 13 and a bowl-shaped groove 14, the linear groove 13 is matched with the antenna 12 in shape and size, the bowl-shaped groove 14 is arranged below the linear groove 13 and communicated with the linear groove 13, and the bowl-shaped groove 14 is of a spherical structure. The bottom of antenna 12 is fixed continuous through the mode of welding or cementing with rolling ball 15, rolling ball 15 and ball bowl shape recess 14 phase-match, rolling ball 15 movable mounting is in ball bowl shape recess 14 to can rotate. The invention can transmit the digital signal to the external terminal 34 with the Bluetooth receiving function wirelessly through the Bluetooth module 10, the antenna pedestal 11 and the antenna 12, wherein the external terminal 34 is a mobile phone, an oscilloscope, a server, a processor, a loudspeaker and the like.

As shown in fig. 2 and 4, the other path of the bluetooth stethoscope is a wired output structure, and the wired output structure includes a speaker 16, a built-in sound tube 17, a connecting tube 18, a connector 19, and an external sound tube 20. The input end of the loudspeaker 16 is connected with the second output end 7 of the main board 4, the output end of the loudspeaker 16 is connected with the built-in sound transmission pipe 17, and the built-in sound transmission pipe 17 is a hollow metal pipe or a sound transmission plastic hose. The casing 1 is provided with a connecting pipe 18, the left side of the connecting pipe 18 is opposite to the built-in sound transmission pipe 17, the connecting pipe 18 is a hollow metal pipe, and a connector 19 capable of being inserted and pulled is arranged in the connecting pipe 18. The connector 19 and the connecting pipe 18 are matched, the front end of the connector 19 is conical, the rear end of the connector 19 is cylindrical and is made of metal materials such as red copper, the connector 19 is inserted into the connecting pipe 18 to be connected with the built-in sound transmission pipe 17, and the external sound transmission hose 20 is connected with the connector 19. The external sound-transmitting hose 20 is a hollow metal tube or a sound-transmitting plastic hose, and the external sound-transmitting hose 20 is connected with an external earphone 35 or earplug.

Preferably, a plurality of annular retaining rings 21 are arranged in the connecting pipe 18, and the annular retaining rings 21 are made of rubber materials. The outer ring of the annular retainer ring 21 is fixedly connected with the inner wall of the connecting pipe 18 through super glue, and the inner ring of the annular retainer ring 21 is smaller than the outer diameter of the connecting head 19. When the connector 19 is inserted into the connecting pipe 18 through the inner ring of the annular retainer 21, the annular retainer 21 can play a role of waterproof and dustproof.

The connecting pipe 18 is a circular hollow pipe, the left end of the connecting pipe 18 is connected with an arc-shaped groove 22 in a welding mode, and an arc-shaped plug 23 matched with the arc-shaped groove 22 is arranged in the arc-shaped groove 22. The arc plug 23 is made of rubber materials and is an arc-shaped piston, the arc plug 23 is fixedly connected with one end of the arc rod 24, and the arc rod 24 is an arc-shaped round rod and is made of plastics or metal materials. The other end of the arc-shaped rod 24 is fixedly connected with a rotating plate 25 in a gluing or welding mode, and the rotating plate 25 is a rectangular metal thin plate. The lower end of the rotating plate 25 is connected with a sleeve 26 in a welding mode, the sleeve 26 is movably arranged on a rotating shaft 27, and the sleeve 26 is connected with the rotating shaft 27 in a rotating mode. The two ends of the rotating shaft 27 are fixed on a mounting seat 28, and the mounting seat 28 is welded on a mounting plate 29. The mounting plate 29 is a rectangular metal thin plate, a compression spring 30 is arranged between the mounting plate 29 and the rotating plate 25, the upper end of the compression spring 30 is connected with the mounting plate 29 in a welding mode, and the lower end of the compression spring 30 is connected with the mounting plate 29 in a welding mode.

As shown in fig. 5, the arc-shaped slot 22 is composed of an arc-shaped tube 31, a bottom plate 32 and a connecting hole 33, wherein the bottom plate 32 is circular and is made of thin steel plate. The right side of the bottom plate 32 is connected with the connecting pipe 18 in a welding mode, a connecting hole 33 is formed in the center of the bottom plate 32, the size of the connecting hole 33 is matched with that of the connecting pipe 18, and the left side of the bottom plate 32 is connected with the arc-shaped pipe 31 in a welding mode. The arc-shaped pipe 31 is a hollow metal pipe, the inner diameter of the arc-shaped pipe 31 is larger than that of the connecting pipe 18, and the projected area of the arc-shaped pipe 31 in the direction perpendicular to the connecting pipe 18 (i.e. the longitudinal direction) is larger than the sectional area of the connecting pipe 18. Preferably, the inner diameter of the arc tube 31 is 2 to 3 times the inner diameter of the connection tube 18.

As shown in fig. 1, 2, 6 and 7, in order to better meet the requirement of disinfection, the present invention is designed with a waterproof sealing connection structure between the housing cover 2 and the housing 1. The shell cover 2 is circular, and an outer retainer ring 36 is arranged on the edge of the shell cover 2. The outer retainer ring 36 is of an annular ring-shaped structure and is made of a thin plate made of the same material as the shell cover 2, the outer retainer ring 36 is perpendicular to the shell cover 2, the outer retainer ring 36 is connected with the shell cover 2 through welding or integrally formed through stamping, and sealing internal threads are arranged on the inner side of the outer retainer ring 36. The shell 1 is also circular, an inner retainer ring 37 is arranged at the edge of the shell 1, the inner retainer ring 37 is also annular and is made of a thin plate made of the same material as the shell 1. The right end of the inner retainer ring 37 is connected with the edge of the shell cover 2 through an inclined connecting ring 38, the connecting ring 38 is an annular ring, the outer ring of the connecting ring 38 is connected with the edge of the shell cover 2, the inner ring of the connecting ring 38 is connected with the edge of the right end of the inner retainer ring 37, and the connecting mode is bending, stamping or welding. A first elastic layer 39 is adhered to the connecting ring 38, and the first elastic layer 39 is a rubber layer. The outer side of the inner retainer ring 37 is provided with a sealing external thread matched with the sealing internal thread on the outer retainer ring 36, and the outer retainer ring 36 is installed on the inner retainer ring 37 in a threaded matching connection mode. When the housing cover 2 is screwed onto the housing 1 by means of a screw-fit, the right end of the outer collar 36 presses against the first elastic layer 39, forming a first sealing structure. Meanwhile, the inner sealing thread on the inner side of the outer retainer ring 36 is meshed with the outer sealing thread on the outer side of the inner retainer ring 37 to form a second sealing structure.

An annular baffle plate 44 is arranged on the inner side of the shell cover 2, and the annular baffle plate 44 is made of a thin plate made of the same material as the shell cover 2 and fixedly installed on the inner side face of the shell cover 2 through welding. The diameter of the annular baffle 44 is smaller than that of the outer retainer ring 36, a second elastic layer 40 is arranged between the annular baffle 44 and the outer retainer ring 36, and the second elastic layer 40 is a rubber layer and is adhered to the inner side surface of the housing cover 2 in an adhesive manner.

As shown in fig. 2 and 6, an inner cover 45 is disposed on the inner side of the housing 1, the inner cover 45 is a bottle cap-shaped structure with an open left end, a central hole 46 is disposed on the right side surface of the inner cover 45, and the diameter of the central hole 46 is greater than the diagonal length of the main plate 4. The right side surface of the inner lid 45 is fixed to the inside of the case 1 by spot welding. The outer side face of the inner cover 45 is connected with the inner retainer ring 37 in a welded mode, an annular groove 47 is formed in the left side face of the inner cover 45, the annular groove 47 is matched with an annular blocking piece 44 on the inner side of the shell cover 2, a third elastic layer 41 is pasted in the annular groove 47, and the third elastic layer 41 is a rubber layer or a sponge elastic material layer.

When the housing cover 2 is screwed to the housing 1 by screw-fitting, the second elastic layer 40 on the inner side of the housing cover 2 presses the left side of the inner cover 45 to form a third seal structure. Meanwhile, the annular blocking piece 44 on the inner side of the housing cover 2 is inserted into the annular groove 47 on the left side surface of the inner cover 45, and the third elastic layer 41 tightly wraps the annular blocking piece 44 through the elastic action to form a fourth sealing structure.

As shown in fig. 6 and 7, an inclined first elastic ring 49 is welded to the inner side surface of the inner lid 45, and the first elastic ring 49 is an inclined annular ring and is made of a spring steel material. The first elastic ring 49 inclines towards the shell cover 2, a corresponding second elastic ring 50 is welded on the inner side face of the shell cover 2, the second elastic ring 50 is also an inclined annular ring, is made of spring steel materials, and has the same size and shape as the first elastic ring 49. The second elastic ring 50 is fixed on the inner side of the shell cover 2 in an inclined mode, the second elastic ring 50 inclines towards the inner cover 45, the inclined angle of the second elastic ring 50 is the same as that of the first elastic ring 49, and the second elastic ring 50 is connected with the first elastic ring 49 in an elastic contact mode.

A fourth elastic layer 42 is arranged between the second elastic ring 50 and the annular baffle 44, the fourth elastic layer 42 is made of rubber material or propenyl elastic material, and the fourth elastic layer 42 is adhered to the inner side surface of the housing cover 2. A fifth elastic layer 43 is arranged between the first elastic ring 49 and the annular groove 47, and the fifth elastic layer 43 is fixed on the left side surface of the inner cover 45. When the housing cover 2 is screwed onto the housing 1 by means of a screw-fit, the second elastic ring 50 on the inner side of the housing cover 2 presses the first elastic ring 49 on the inner cover 45 to form a fifth sealing structure. At the same time, the fourth elastic layer 42 on the inner side of the housing cover 2 presses the fifth elastic layer 43 on the left side of the inner cover 45 to form a sixth sealing structure.

The welding has a fixing base 51 on the lateral surface of casing 1, fixing base 51 is the cuboid, adopts the stainless steel material preparation, be equipped with in the fixing base 51 arc hole 52 fixed bracelet 48 adopts plastics or metal material preparation for circular annular structure, fixed bracelet 48 passes arc hole 52 in the fixing base 51 and becomes to rotate with fixing base 51 and is connected.

As shown in fig. 1, the outside of the junction of the casing 1 and the casing cover 2 is provided with a rubber waterproof jacket 53, the rubber waterproof jacket 53 is in the shape of a cover body with an opening at the left end, the right side of the rubber waterproof jacket 53 is provided with a round hole, the diameter of the round hole is larger than that of the fixing bracelet 48, and the side of the rubber waterproof jacket 53 is tightly sleeved at the junction of the casing cover 2 and the casing 1 through elastic action. The upper side and the lower side of the rubber waterproof jacket 53 are provided with sticky stickers 54 or binding tapes, and the sticky stickers 54 or the binding tapes are connected with the rubber waterproof jacket 53 in a gluing or sewing or riveting mode. It should be noted that, the upper and lower sides of the rubber waterproof case 53 may also be provided with engaging lugs made of rubber material, and the sticky sticker 54 or the binding band is connected with the engaging lugs by binding.

The invention is provided with a plurality of different waterproof sealing structures, has good waterproof sealing performance, can be sprayed and cleaned by alcohol, water or a disinfectant, and can also be directly immersed into the alcohol, the water or the disinfectant for disinfection. For the novel coronavirus with extremely strong infectivity, after a stethoscope is used for diagnosing a patient, the patient can be strictly disinfected by using a disinfectant or alcohol, so that the health safety of instruments and personnel is ensured.

Example 2

The present embodiment is basically the same as the structure of embodiment 1, and also adopts a wired and wireless two-way output structure, and also designs a multi-way waterproof sealing structure, and the difference is that the sensor adopted in the present embodiment is a resonant magnetic suspension sensor 55.

As shown in FIGS. 8-11, a Bluetooth stethoscope comprises a housing 1, a housing cover 2, a sensor 3, a motherboard 4, and a battery 8. Casing 1 and cap 2 are circular, adopt stainless steel or other metal material preparation, cap 2 is installed on casing 1 through threaded connection's mode, form a cavity between cap 2 and the casing 1, sensor 3, mainboard 4, battery 8 all are located the cavity. The sensor 3 is arranged on the inner side surface of the shell cover 2 in a gluing or screw fixing mode, and the inner side surface of the shell 1 is provided with a mainboard 4 and a battery 8. The main board 4 is mounted on the inner side surface of the shell 1 through screws and fixing studs 5. The inboard welding of casing 1 has four columniform fixing stud 5, the left end of fixing stud 5 is equipped with the screw hole, be equipped with the through-hole corresponding with fixing stud 5's screw hole on four angles of mainboard 4, the screw passes through the through-hole on four angles of mainboard 4 and inserts the threaded hole of fixing stud 5, forms the screw-thread fit installation. The battery 8 is fixed on the inner side surface of the shell 1 through a pressing plate 9 and screws, the pressing plate 9 is Z-shaped, one end of the pressing plate 9 compresses the battery 8, and the other end of the pressing plate 9 is fixed on the inner side surface of the shell 1 through screws or welding. The input end of the mainboard 4 is connected with the sensor 3, and the sensor 3 adopts a buzzer sensor. The battery 8 is electrically connected with the mainboard 4 and provides electric energy for the mainboard 4. The mainboard 4 is provided with two paths of output structures, one path is a wireless output structure, and the other path is a wired output structure.

As shown in fig. 8 and 9, the wireless output structure includes a bluetooth module 10, an output connection line, an antenna mount 11, and an antenna 12. Bluetooth module 10 links to each other with the first output 6 of mainboard 4, antenna pedestal 11 fixed mounting is on the lateral surface of casing 1, install rotatable antenna 12 on the antenna pedestal 11, antenna 12 passes through the output connecting wire and links to each other with Bluetooth module 10. Preferably, the antenna mount 11 is a rectangular parallelepiped block structure and is made of plastic or metal material, and the antenna mount 11 is mounted on the outer side surface of the housing 1 by welding or screw fixation. The antenna base 11 is provided with a linear groove 13 and a bowl-shaped groove 14, the linear groove 13 is matched with the antenna 12 in shape and size, the bowl-shaped groove 14 is arranged below the linear groove 13 and communicated with the linear groove 13, and the bowl-shaped groove 14 is of a spherical structure. The bottom of antenna 12 is fixed continuous through the mode of welding or cementing with rolling ball 15, rolling ball 15 and ball bowl shape recess 14 phase-match, rolling ball 15 movable mounting is in ball bowl shape recess 14 to can rotate. The invention can transmit the digital signal to the external terminal 34 with the Bluetooth receiving function wirelessly through the Bluetooth module 10, the antenna pedestal 11 and the antenna 12, wherein the external terminal 34 is a mobile phone, an oscilloscope, a server, a processor, a loudspeaker and the like.

As shown in fig. 8 and 10, the other path of the bluetooth stethoscope is a wired output structure, and the wired output structure includes a speaker 16, a built-in sound tube 17, a connecting tube 18, a connector 19, and an external sound tube 20. The input end of the loudspeaker 16 is connected with the second output end 7 of the main board 4, the output end of the loudspeaker 16 is connected with the built-in sound transmission pipe 17, and the built-in sound transmission pipe 17 is a hollow metal pipe or a sound transmission plastic hose. The casing 1 is provided with a connecting pipe 18, the left side of the connecting pipe 18 is opposite to the built-in sound transmission pipe 17, the connecting pipe 18 is a hollow metal pipe, and a connector 19 capable of being inserted and pulled is arranged in the connecting pipe 18. The connector 19 and the connecting pipe 18 are matched, the front end of the connector 19 is conical, the rear end of the connector 19 is cylindrical and is made of metal materials such as red copper, the connector 19 is inserted into the connecting pipe 18 to be connected with the built-in sound transmission pipe 17, and the external sound transmission hose 20 is connected with the connector 19. The external sound-transmitting hose 20 is a hollow metal tube or a sound-transmitting plastic hose, and the external sound-transmitting hose 20 is connected with an external earphone 35 or earplug.

As shown in fig. 10, a plurality of annular retaining rings 21 are preferably provided in the connecting pipe 18, and the annular retaining rings 21 are made of rubber material. The outer ring of the annular retainer ring 21 is fixedly connected with the inner wall of the connecting pipe 18 through super glue, and the inner ring of the annular retainer ring 21 is smaller than the outer diameter of the connecting head 19. When the connector 19 is inserted into the connecting pipe 18 through the inner ring of the annular retainer 21, the annular retainer 21 can play a role of waterproof and dustproof.

As shown in fig. 8 and 11, the sensor used in the present invention is a resonant magnetic suspension sensor 55, and the resonant magnetic suspension sensor 55 includes a vibrating reed 56, a bowl-shaped cover plate 57, a wedge-shaped air faucet 60, a resonant box 62, a first resonant piece 64, a magnetic connecting rod 67, a magnetic block with reversed polarity 68, a second resonant piece 66, and a piezoresistor 70. The vibrating piece 56 is a metal diaphragm or a plastic diaphragm or a ceramic diaphragm with a thickness of 0.01-0.1mm, and the vibrating piece 56 is installed at the center of the case cover 2 by welding, casting, adhering or etching. Preferably, a circular through hole is formed in the center of the housing cover 2, the vibration plate 56 is matched with the through hole in the center of the housing cover 2, and the vibration plate 56 is mounted in the through hole in the center of the housing cover 2 by welding.

Bowl-shaped apron 57 is formed by the red copper sheet or the plastic sheet punching press that thickness is 0.1-1mm, bowl-shape high, the center is low all around, bowl-shaped apron 57's edge is equipped with connects the limit 58, connect the limit 58 for ring shape, the inner circle of connecting the limit 58 is through welding, casting or punching press integrated into one piece with bowl-shaped apron 57's edge, bowl-shaped apron 57's connection limit 58 is installed on the medial surface of apron through gluing or with the mode of fix with screw. Preferably, a rubber sealing ring 61 is arranged between the connecting edge 58 and the inner side surface of the cover plate.

A vibration cavity 59 is formed between the bowl-shaped cover plate 57 and the vibrating plate 56, and a wedge-shaped air nozzle 60 with two open ends is installed in the center of the bowl-shaped cover plate 57. The shape of the wedge-shaped air faucet 60 is a wedge with a left end opening larger than a right end opening, the longitudinal section of the wedge-shaped air faucet 60 is trapezoidal, the left end opening of the wedge-shaped air faucet 60 is round or square, and preferably, the left end opening of the wedge-shaped air faucet 60 is round with the diameter of 3-6 mm. The right end opening of the wedge-shaped air faucet 60 is also circular or square, the size of the right end opening is smaller than that of the left end opening of the wedge-shaped air faucet 60, and preferably, the right end opening of the wedge-shaped air faucet 60 is circular with the diameter of 1-3 mm. The wedge-shaped air tap 60 is made of the same material as the bowl-shaped cover plate 57 and is connected with the bowl-shaped cover plate 57 into a whole in a welding, injection molding or gluing mode.

The right side of wedge air cock 60 is equipped with resonance box 62, resonance box 62 is rectangle, square or oval hollow box, adopts metal material or plastics preparation. In this embodiment, the resonant tank 62 is preferably a square box, the upper portion of the resonant tank 62 is connected to the lower end of an upper fixing rod 71 by welding or screws, and the upper fixing rod 71 is made of stainless steel, and there are two in total. The upper end of the upper fixing rod 71 is connected with the upper part of the shell 1 by welding or screw fixation. The lower part of the resonance box 62 is connected with the upper end of a lower fixing rod 72 through welding or screws, and the lower fixing rod 72 is made of stainless steel materials, and the number of the lower fixing rods is also two. The lower end of the lower fixing rod 72 is connected with the lower part of the housing 1 by welding or screw fixation.

A first circular hole 63 is formed in the left side wall of the resonance box 62, the first resonance plate 64 is circular, the first resonance plate 64 is located in the first circular hole 63, the inner diameter of the first circular hole 63 is larger than the outer diameter of the first resonance plate 64, and a gap of 0.3-1mm is reserved between the first resonance plate 64 and the first circular hole 63. The first resonance sheet 64 is opposite to the right end opening of the wedge-shaped air tap 60, the first resonance sheet 64 is circular or square and is made of a copper sheet or a stainless steel sheet with the thickness of 0.05-0.5 mm.

A second circular hole 65 is formed on the right side wall of the resonance box 62, and the radius of the first circular hole 63 is smaller than or equal to that of the second circular hole 65. The second resonance plate 66 is positioned in the second circular hole 65, and the inner diameter of the second circular hole 65 is greater than the outer diameter of the second resonance plate 66. The second resonance plate 66 has the same shape as the first resonance plate 64, and is made of the same material as the first resonance plate 64, and the area of the first resonance plate 64 is smaller than or equal to the area of the second resonance plate 66. Preferably, the area of the first resonance plate 64 is one half to one quarter of the area of the second resonance plate 66, and a gap of 0.3-1mm is provided between the second resonance plate 66 and the second circular hole 65. A magnetic connecting rod 67 is arranged between the first resonance sheet 64 and the second resonance sheet 66, the left end of the magnetic connecting rod 67 is connected with the first resonance sheet 64 in a gluing, screw fixing or welding manner, and the right end of the magnetic connecting rod 67 is connected with the second resonance sheet 66 in a gluing, screw fixing or welding manner. The right side of the second resonator plate 66 is adhesively connected to a piezo-resistor 70, and the piezo-resistor 70 is connected to an output terminal in the main board 4.

The magnetic connecting rod 67 is a long and thin square rod, the upper half part of the magnetic connecting rod 67 is an N pole, and the lower half part of the magnetic connecting rod 67 is an S pole. The magnetic connecting rod 67 is provided with a reverse polarity magnetic block 68 with opposite magnetic poles below, and the reverse polarity magnetic block 68 is of a cuboid block structure. The reversed polarity magnetic block 68 is installed on the fixing block 69 in a screw fixing or embedding manner, the fixing block 69 is a cuboid metal block, a plastic block, a wood block or a ceramic block, and the bottom of the fixing block 69 is installed on the bottom plate of the resonance box 62 in a welding or gluing manner. The upper half of the reverse polarity magnetic block 68 is an S pole, and the upper half of the reverse polarity magnetic block 68 is an N pole. The sum of the gravity borne by the first resonant sheet 64, the magnetic connecting rod 67 and the second resonant sheet 66 is equal to the magnetic acting force of the magnetic block 68 on the magnetic connecting rod 67, so that the first resonant sheet 64, the magnetic connecting rod 67 and the second resonant sheet 66 are suspended in the resonant tank 62. Under the action of magnetic suspension, the motion friction force during resonance is zero, so that the interference of friction noise can be effectively eliminated, the vibration resistance is reduced, the vibration sensitivity is improved, and the high sensitivity and the accuracy of the stethoscope are further ensured.

It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present invention, and each component which is not specified in the present embodiment can be implemented by using the prior art.

Claims

1. The utility model provides a bluetooth stethoscope, includes casing, cap, sensor, mainboard, battery, bluetooth module, the cap is installed on the casing, form a cavity between cap and the casing, the sensor is installed in the inboard of cap, mainboard and battery are installed to the inboard of casing, the sensor links to each other with the mainboard, the battery is connected with the mainboard electricity, provides the electric energy for the mainboard, its characterized in that: the main board is provided with two output structures, one is a wireless output structure, and the other is a wired output structure; the wireless output structure comprises a Bluetooth module, an output connecting wire, an antenna seat and an antenna, wherein the first output end of the mainboard is connected with the Bluetooth module, the antenna seat is fixedly arranged on the outer side surface of the shell, the rotatable antenna is arranged on the antenna seat, and the antenna is connected with the Bluetooth module through the output connecting wire; wired output structure includes speaker, built-in transaudient pipe, connecting pipe, connector, outside transaudient hose, the second output of mainboard links to each other with the speaker, the connecting pipe is installed on the casing, the left side of connecting pipe is equipped with built-in transaudient pipe, built-in transaudient pipe links to each other with the speaker, connector and connecting pipe looks adaptation, the connector inserts and passes the connecting pipe and link to each other with built-in transaudient pipe, outside transaudient hose links to each other with the connector.

2. The bluetooth stethoscope according to claim 1, wherein: the antenna seat is fixed on the outer side face of the shell through screws, a linear groove and a bowl-shaped groove are formed in the antenna seat, the linear groove is matched with the antenna, the bowl-shaped groove is formed below the linear groove and communicated with the linear groove, a rotating ball is arranged at the bottom of the antenna, and the rotating ball is movably mounted in the bowl-shaped groove.

3. The bluetooth stethoscope according to claim 2, wherein: the utility model discloses a connector, including the connecting pipe, be equipped with a plurality of annular retaining rings in the connecting pipe, the outer lane of annular retaining ring links to each other with the inner wall of connecting pipe is fixed, the inner circle of annular retaining ring is less than the external diameter of connector, the left end and the arc wall of connecting pipe link to each other, be equipped with the arc stopper of looks adaptation in the arc wall, the arc stopper links to each other with the one end stationary phase of arc pole, the other end and the rotor plate fixed connection of arc pole, the lower extreme and the sleeve of rotor plate are fixed and link to each other, sleeve movable mounting is in the axis of rotation, the sleeve becomes to rotate with the axis of rotation and is connected, the axis of rotation both ends are fixed on the mount pad, the mount pad is fixed on the mounting panel, is equipped.

4. The bluetooth stethoscope according to claim 1, wherein: an outer retainer ring is arranged at the edge of the shell cover, a sealing internal thread is arranged on the inner side of the outer retainer ring, an inner retainer ring is arranged at the edge of the shell, a sealing external thread matched with the sealing internal thread on the outer retainer ring is arranged on the outer side of the inner retainer ring, the right end of the inner retainer ring is connected with the edge of the shell cover through an inclined connecting ring, and a first elastic layer is arranged on the connecting ring; the inner side of the shell cover is provided with an annular separation blade, a second elastic layer is arranged between the annular separation blade and the outer retaining ring and arranged on the shell cover, the inner side of the shell is provided with an inner cover, the outer side surface of the inner cover is fixedly connected with the inner retaining ring, the right side surface of the inner cover is fixedly connected with the inner side of the shell cover, the left side surface of the inner cover is provided with an annular groove, a third elastic layer is adhered in the annular groove, and the annular groove is matched with the annular separation blade on the inner side of the shell cover; an inclined first elastic ring is arranged on the inner side surface of the inner cover, a corresponding second elastic ring is arranged on the inner side of the shell cover, and the second elastic ring is in elastic contact connection with the first elastic ring; and a fourth elastic layer is arranged between the second elastic ring and the annular baffle and fixed on the inner side surface of the shell cover, and a fifth elastic layer is arranged between the first elastic ring and the annular groove and fixed on the left side surface of the inner cover.

5. The bluetooth stethoscope according to claim 4, wherein: fixed bracelet is installed in the outside of casing, the junction of casing and cap is equipped with the waterproof cover of rubber, the outside of the waterproof cover of rubber is equipped with viscidity subsides or ligature area.

6. The bluetooth stethoscope according to claim 1, wherein: the sensor is a resonant magnetic suspension sensor which comprises a vibrating reed, a bowl-shaped cover plate, a wedge-shaped air nozzle, a resonance box, a first resonant sheet, a magnetic connecting rod, a reverse polarity magnetic block, a second resonant sheet and a piezoresistor; the vibrating plate is arranged in the center of the shell cover, the bowl-shaped cover plate is fixed on the right side surface of the shell cover, a vibrating cavity is formed between the bowl-shaped cover plate and the vibrating plate, the center of the bowl-shaped cover plate is provided with a wedge-shaped air tap with two open ends, the left end opening of the wedge-shaped air tap is larger than the right end opening, a resonance box is arranged on the right side of the wedge-shaped air tap, the resonance box is a hollow box body, a first resonance sheet is arranged on the left side wall of the resonance box, the first resonance sheet is over against the right end opening of the wedge-shaped air tap, the right side wall of the resonance box is provided with a second resonance sheet, a magnetic connecting rod is arranged between the first resonance sheet and the second resonance sheet, the left end of the magnetic connecting rod is connected with the first resonance sheet, the right end of the magnetic connecting rod is connected with the second resonance sheet, an antipolarity magnetic block with opposite magnetic poles is arranged below the magnetic connecting rod, and the right side face of the second resonance sheet is connected with the piezoresistor.

7. The bluetooth stethoscope according to claim 6, wherein: the resonance box is a hollow square box body, be equipped with first circular port on the left side wall of resonance box, first resonance piece is circular, first resonance piece is located first circular port, and the internal diameter of first circular port is greater than the external diameter of first resonance piece, be equipped with the second circular port on the right side wall of resonance box, the second resonance piece is also circular, the second resonance piece is located the circular port of second, and the internal diameter of second circular port is greater than the external diameter of second resonance piece.

8. The bluetooth stethoscope according to claim 6, wherein: the magnetic connecting rod is a slender square rod, the upper half part of the magnetic connecting rod is an N pole, and the lower half part of the magnetic connecting rod is an S pole; the magnetic block with reversed polarity is in a cuboid block structure, the upper half part of the magnetic block with reversed polarity is an S pole, and the upper half part of the magnetic block with reversed polarity is an N pole; the sum of the gravity borne by the first resonance sheet, the magnetic connecting rod and the second resonance sheet is equal to the magnetic acting force of the magnetic connecting rod by the magnetic block with the opposite polarity.

9. The bluetooth stethoscope according to claim 6, wherein: the wedge-shaped air tap is a wedge with a left end opening larger than a right end opening, the left end opening of the wedge-shaped air tap is circular with the diameter of 3-6mm, and the right end opening of the wedge-shaped air tap is circular with the diameter of 1-3 mm.

10. The bluetooth stethoscope according to claim 6, wherein: the upper portion of the resonance box is connected with the lower end of the upper fixing rod, the upper end of the upper fixing rod is fixedly connected with the upper portion of the shell, the lower portion of the resonance box is connected with the upper end of the lower fixing rod, and the lower end of the lower fixing rod is fixedly connected with the lower portion of the shell.