CN112672252B - Hearing aid circuit for medical bed - Google Patents
Hearing aid circuit for medical bed Download PDFInfo
- Publication number
- CN112672252B CN112672252B CN202011417027.2A CN202011417027A CN112672252B CN 112672252 B CN112672252 B CN 112672252B CN 202011417027 A CN202011417027 A CN 202011417027A CN 112672252 B CN112672252 B CN 112672252B
- Authority
- CN
- China
- Prior art keywords
- circuit
- pin
- capacitor
- hexainverter
- potentiometer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention relates to the field of medical treatment, in particular to a hearing aid circuit for a medical bed. The technical problem of the invention is that: the hearing aid circuit for the medical bed is convenient for communication between doctors and patients and avoids mishearing of the patients. The technical implementation scheme of the invention is as follows: a hearing aid circuit for a medical bed comprises a power supply circuit, an electret microphone, a coupling capacitor, an alternating current amplifier and the like, wherein the electret microphone is connected with the coupling capacitor, and the coupling capacitor is connected with the alternating current amplifier. The alternating current amplifier can amplify the sound, and the amplified sound is played from the earphone or the loudspeaker, so that the patient can hear the words spoken by the doctor clearly, the doctor and the patient can communicate conveniently, and the patient can be prevented from hearing mistakes; the volume of the loudspeaker and the earphone can be adjusted by adjusting the potentiometer through the amplification factor, so that the device can be suitable for different patients.
Description
Technical Field
The invention relates to the field of medical treatment, in particular to a hearing aid circuit for a medical bed.
Background
In the medical industry, the patient who suffers from serious disease needs to be in hospital and receives the treatment, and patient is in the in-hospital period, and the doctor can come the condition of inquiring patient regularly, makes things convenient for the doctor to judge patient's the state of an illness, and some patients are older than normal, and hearing has descended, may not hear the doctor's speech, and it is very inconvenient to communicate, and patient may listen to the mistake, has produced very big influence to the doctor's judgement state of an illness.
How to design a hearing aid circuit for a medical bed, which can facilitate communication between doctors and patients and avoid the patients from hearing errors, becomes a problem to be solved at present.
Disclosure of Invention
In order to overcome the defects that some patients are older, have poor hearing, possibly cannot hear the words of doctors, are inconvenient to communicate, and patients may hear incorrectly, which greatly influences the doctor to judge the state of an illness, the invention has the technical problems that: the hearing aid circuit for the medical bed is convenient for communication between doctors and patients and avoids mishearing of the patients.
The technical implementation scheme of the invention is as follows: the utility model provides a hearing aid circuit for medical bed, is including power supply circuit, electret microphone, coupling capacitance, alternating current amplifier, change over switch, emitter follower, earphone socket, audio amplifier circuit and speaker, the electret microphone is connected with coupling capacitance, coupling capacitance is connected with alternating current amplifier, alternating current amplifier is connected with change over switch, change over switch is connected with the emitter follower, the emitter follower is connected with the earphone socket, audio amplifier circuit is connected with change over switch, the speaker is connected with audio amplifier circuit, power supply circuit is electret microphone, coupling capacitance, alternating current amplifier, change over switch, emitter follower, earphone socket, audio amplifier circuit and speaker power supply.
In a preferred embodiment of the present invention, the power supply further includes an amplification adjustment potentiometer, the amplification adjustment potentiometer is connected to the ac amplifier, and the power supply circuit supplies power to the amplification adjustment potentiometer.
In a preferred embodiment of the present invention, the ac amplifier includes a hexainverter circuit CD4069, a microphone MK1, a switch S1, a dial switch S2, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R5, an electrolytic capacitor EC3, a transistor Q1, a potentiometer VR2, and an earphone socket J1, the 7 pin of the hexainverter circuit CD4069 is grounded, the 2 pin of the hexainverter circuit CD4069 is connected to the 3 pin thereof, the 4 pin of the hexainverter circuit CD4069 is connected to the 5 pin thereof, the 1 pin of the hexainverter circuit CD4069 is connected to the 5 pin thereof in parallel with the resistor R2, the 14 pin of the hexainverter circuit CD4069 is connected to the S1 in series, the 7 pin of the hexainverter circuit CD4069 is connected to one end of a microphone MK1, the other end of the microphone CD 1 is connected to the resistor R4027 and the capacitor C5 in series, the other end of the resistor R1 is connected to the hexainverter circuit CD4069 and the pole of the hexainverter circuit CD 2, the 3-pin series connection electrolytic capacitor EC3 and the potentiometer VR2 of the dial switch S2, the other end of the potentiometer VR2 is grounded, the 4-pin series connection capacitor C3 of the dial switch S2 and the base of the triode Q1 are connected in series, the collector of the triode Q1 is grounded, the base series resistance R5 of the triode Q1 is grounded, the emitter of the triode Q1 is connected with one end of the earphone socket J1, and the other two ends of the earphone socket J1 are connected with the 14 pins of the six-inverter circuit CD 4069.
In a preferred embodiment of the present invention, the amplification factor adjusting potentiometer is a potentiometer VR1, one terminal of the potentiometer VR1 is connected to the other terminal of the capacitor C2, and the other terminal and the input terminal of the potentiometer VR1 are both connected to pin 1 of the six-inverter circuit CD 4069.
In a preferred embodiment of the present invention, the audio amplifying circuit comprises an audio integrated circuit LM386, a capacitor C1, a capacitor C4, an electrolytic capacitor EC1, an electrolytic capacitor EC2, an electrolytic capacitor EC4, a resistor R3, a resistor R4 and a speaker LS1, wherein pin 2 of the audio integrated circuit LM386 is connected to the input terminal of the potentiometer VR2, pin 3 and pin 4 of the audio integrated circuit LM386 are both grounded, pin 2 of the audio integrated circuit LM386 is connected in series to the resistor R4, the electrolytic capacitor EC1 and the speaker LS1, the other terminal of the speaker LS1 is grounded, pin 5 of the audio integrated circuit LM386 is connected to a node between the resistor R4 and the electrolytic capacitor EC1, pin 5 of the audio integrated circuit LM386 is connected in series to the resistor R3 and the capacitor C1, the other terminal of the capacitor C1 is grounded, pin 1 of the audio integrated circuit LM386 is connected in parallel to the electrolytic capacitor EC2, pin 6 of the audio integrated circuit LM386 is connected to the inverse CD4069 of the six-stage circuit LM 14, the pin 6 of the audio integrated circuit LM386 is respectively connected with an electrolytic capacitor EC4 and a capacitor C4 in series, and the other ends of the electrolytic capacitor EC4 and the capacitor C4 are both grounded.
The invention has the beneficial effects that:
1. the alternating current amplifier can amplify the sound, and the amplified sound is played from the earphone or the loudspeaker, so that the patient can hear the words spoken by the doctor clearly, the doctor and the patient can communicate conveniently, and the patient can be prevented from hearing the wrong words.
2. The volume of the loudspeaker and the earphone can be adjusted by adjusting the potentiometer through the amplification factor, so that the earphone is suitable for different patients.
Drawings
FIG. 1 is a block diagram of the circuit of the present invention.
Fig. 2 is a schematic circuit diagram of the present invention.
The parts are numbered as follows: 1. the device comprises a power supply circuit, 2, an electret microphone, 3, a coupling capacitor, 4, an alternating current amplifier, 5, an amplification factor adjusting potentiometer, 6, a change-over switch, 7, an emitter follower, 8, an earphone socket, 9, an audio amplification circuit, 10 and a loudspeaker.
Detailed Description
The present invention will be further described with reference to specific examples, which are illustrative of the invention and are not to be construed as limiting the invention.
Example 1
A hearing aid circuit for a medical bed comprises a power supply circuit 1, an electret microphone 2, a coupling capacitor 3, an AC amplifier 4, a switch 6, an emitter follower 7, an earphone socket 8, an audio amplification circuit 9 and a loudspeaker 10, the electret microphone 2 is connected with a coupling capacitor 3, the coupling capacitor 3 is connected with an alternating current amplifier 4, the alternating current amplifier 4 is connected with a switch 6, the switch 6 is connected with an emitter follower 7, the emitter follower 7 is connected with an earphone socket 8, the audio amplification circuit 9 is connected with a change-over switch 6, the loudspeaker 10 is connected with the audio amplification circuit 9, and the power supply circuit 1 supplies power for the electret microphone 2, the coupling capacitor 3, the alternating current amplifier 4, the change-over switch 6, the emitter follower 7, the earphone socket 8, the audio amplification circuit 9 and the loudspeaker 10.
The doctor inserts the earphone on earphone socket 8, then wear the earphone on patient's head, the doctor can talk with patient, doctor's voice is input among electret microphone 2, electret microphone 2 is with in the sound input coupling capacitance 3, coupling capacitance 3 is handled sound, in the sound input ac amplifier 4 after the processing, ac amplifier 4 amplifies sound, the sound after the amplification is input among emitter follower 7, play away from the earphone through emitter follower 7, patient just so can listen clear doctor's speech, make things convenient for doctor and patient to communicate, avoid patient to hear by mistake, if patient is inconvenient to wear the earphone, the doctor can press change over switch 6, switch over into speaker 10 broadcast, press change over switch 6 once more, switch over back the earphone broadcast.
Example 2
On the basis of the embodiment 1, as shown in fig. 1, the power supply circuit 1 further includes an amplification factor adjusting potentiometer 5, the amplification factor adjusting potentiometer 5 is connected to the ac amplifier 4, and the power supply circuit 1 supplies power to the amplification factor adjusting potentiometer 5.
The doctor can adjust the amplification factor of the alternating current amplifier 4 to the sound through the amplification factor adjusting potentiometer 5, and then adjust the volume, so that the doctor can be suitable for different patients.
Example 3
In a hearing aid circuit for a medical bed, as shown in fig. 2, the ac amplifier 4 includes a hexainverter circuit CD4069, a microphone MK1, a switch S1, a dial switch S2, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R5, an electrolytic capacitor EC3, a transistor Q1, a potentiometer VR2, and an earphone socket J1, the 7-pin of the hexainverter circuit CD4069 is grounded, the 2-pin of the hexainverter circuit CD4069 is connected to the 3-pin thereof, the 4-pin of the hexainverter circuit CD4069 is connected to the 5-pin thereof, the 1-pin of the hexainverter circuit CD4069 is connected to the 5-pin thereof in parallel with the resistor R2, the 14-pin switch S1 of the hexainverter circuit CD4069, the 7-pin of the hexainverter circuit CD4069 is connected to one end of the microphone 1, the other end of the microphone CD 1 is connected in series with a resistor R4027 and a capacitor C585-pin of the CD4069, the other end of the hexainverter circuit CD 24 is connected to the six-pin of the CD 2-pin of the CD circuit MK circuit CD 2 and the microphone circuit MK 2, the 3-pin series connection electrolytic capacitor EC3 and the potentiometer VR2 of the dial switch S2, the other end of the potentiometer VR2 is grounded, the 4-pin series connection capacitor C3 of the dial switch S2 and the base of the triode Q1 are connected in series, the collector of the triode Q1 is grounded, the base series resistance R5 of the triode Q1 is grounded, the emitter of the triode Q1 is connected with one end of the earphone socket J1, and the other two ends of the earphone socket J1 are connected with the 14 pins of the six-inverter circuit CD 4069.
The amplification factor adjusting potentiometer 5 is a potentiometer VR1, one end of the potentiometer VR1 is connected with the other end of the capacitor C2, and the other end and the input end of the potentiometer VR1 are both connected with pin 1 of the six-inverter circuit CD 4069.
The audio amplifying circuit 9 comprises an audio integrated circuit LM386, a capacitor C1, a capacitor C4, an electrolytic capacitor EC1, an electrolytic capacitor EC2, an electrolytic capacitor EC4, a resistor R3, a resistor R4 and a loudspeaker LS1, wherein a pin 2 of the audio integrated circuit LM386 is connected with an input end of a potentiometer VR2, pins 3 and 4 of the audio integrated circuit LM386 are grounded, a pin 2 of the audio integrated circuit LM386 is connected with a resistor R4, an electrolytic capacitor EC1 and a loudspeaker LS1 in series, the other end of the loudspeaker LS1 is grounded, a pin 5 of the audio integrated circuit LM386 is connected with a node between the resistor R4 and the electrolytic capacitor EC1, a pin 5 of the audio integrated circuit LM386 is connected with a resistor R3 and a capacitor C1 in series, the other end of the capacitor C1 is grounded, a pin 1 of the audio integrated circuit LM386 is connected with a pin 8 of the electrolytic capacitor EC2 in parallel, a pin CD 6 of the audio integrated circuit LM386 is connected with a pin 4069 of a hexahedron the audio integrated circuit, and the audio integrated circuit LM386 is connected with a pin 14 of the capacitor EC 6956 and the audio integrated circuit LM 6956 and the capacitor LM 4 are connected with an inverter 826952 in series, the other ends of the electrolytic capacitor EC4 and the capacitor C4 are both grounded.
The doctor presses the switch S1, then inserts the earphone into the earphone socket J1, and then wears the earphone on the head of the patient, the doctor can talk with the patient, the doctor' S voice is input into the six inverter circuit CD4069 through the microphone MK1, the six inverter circuit CD4069 amplifies the voice, the amplified voice is played through the earphone, so that the patient can hear the words clearly spoken by the doctor, the doctor and the patient can communicate conveniently, the patient can avoid hearing mistakes, if the patient is inconvenient to wear the earphone, the doctor can press the dial switch S2, switch to the loudspeaker LS1, the amplified voice is input into the audio integrated circuit LM386, and then is played from the loudspeaker LS1, and the doctor can also adjust the amplification factor of the six inverter circuit CD4069 through the potentiometer VR1, and adjust the volume. When not in use, the doctor can press the switch S1 again.
The technical principle of the embodiment of the present invention is described above in conjunction with the specific embodiments. The description is made for the purpose of illustrating the principles of embodiments of the present invention and should not be construed in any way as limiting the scope of embodiments of the present invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive step, and these embodiments will fall within the scope of the present invention.
Claims (1)
1. The utility model provides a hearing aid circuit for medical bed, characterized by, including power supply circuit (1), electret microphone (2), coupling capacitance (3), alternating current amplifier (4), change over switch (6), emitter follower (7), earphone socket (8), audio amplification circuit (9) and speaker (10), electret microphone (2) are connected with coupling capacitance (3), coupling capacitance (3) are connected with alternating current amplifier (4), alternating current amplifier (4) are connected with change over switch (6), change over switch (6) are connected with emitter follower (7), emitter follower (7) are connected with earphone socket (8), audio amplification circuit (9) are connected with change over switch (6), speaker (10) are connected with audio amplification circuit (9), power supply circuit (1) is microphone (2), The power supply is realized by a coupling capacitor (3), an alternating current amplifier (4), a switch (6), an emitter follower (7), an earphone socket (8), an audio amplification circuit (9) and a loudspeaker (10);
the power supply circuit is characterized by further comprising an amplification factor adjusting potentiometer (5), wherein the amplification factor adjusting potentiometer (5) is connected with the alternating current amplifier (4), and the power supply circuit (1) supplies power to the amplification factor adjusting potentiometer (5);
the alternating current amplifier (4) comprises a hexainverter circuit CD4069, a microphone MK1, a switch S1, a dial switch S2, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R5, an electrolytic capacitor EC3, a triode Q1, a potentiometer VR2 and an earphone socket J1, wherein 7 pins of the hexainverter circuit CD4069 are grounded, 2 pins of the hexainverter circuit CD4069 are connected with 3 pins of the hexainverter circuit CD4069, 4 pins of the hexainverter circuit CD4069 are connected with 5 pins of the hexainverter circuit CD4069, 1 pin of the hexainverter circuit CD4069 is connected with 5 pins of the hexainverter circuit CD 2 in parallel, 14 pins of the hexainverter circuit CD4069 are connected with the switch S1 in series, 7 pins of the hexainverter circuit CD4069 are connected with one end of a microphone MK1, the other end of the microphone is connected with a resistor R1 and a capacitor C5 in series, the other end of the hexainverter circuit CD 4024 is connected with the hexainverter circuit CD4069, the hexainverter circuit CD 5732, the hexainverter circuit CD 2 and the hexainverter circuit CD 2, a 3-pin series connection electrolytic capacitor EC3 and a potentiometer VR2 of the dial switch S2, the other end of the potentiometer VR2 is grounded, a 4-pin series connection capacitor C3 of the dial switch S2 and the base of a triode Q1 are connected in series, the collector of the triode Q1 is grounded, the base series resistor R5 of the triode Q1 is grounded, the emitter of the triode Q1 is connected with one end of an earphone socket J1, and the other two ends of the earphone socket J1 are connected with a 14-pin of a hexainverter circuit CD 4069;
the amplification factor adjusting potentiometer (5) is a potentiometer VR1, one end of the potentiometer VR1 is connected with the other end of the capacitor C2, and the other end and the input end of the potentiometer VR1 are both connected with a pin 1 of a six-inverter circuit CD 4069;
the audio frequency amplifying circuit (9) comprises an audio frequency integrated circuit LM386, a capacitor C1, a capacitor C4, an electrolytic capacitor EC1, an electrolytic capacitor EC2, an electrolytic capacitor EC4, a resistor R3, a resistor R4 and a loudspeaker LS1, wherein a pin 2 of the audio frequency integrated circuit LM386 is connected with the input end of a potentiometer VR2, pins 3 and 4 of the audio frequency integrated circuit LM386 are grounded, a pin 2 of the audio frequency integrated circuit LM386 is connected with a resistor R4, an electrolytic capacitor EC1 and a loudspeaker LS1 in series, the other end of the loudspeaker LS1 is grounded, a pin 5 of the audio frequency integrated circuit LM386 is connected with a node between the resistor R4 and the electrolytic capacitor EC1, a pin 5 of the audio frequency integrated circuit LM386 is connected with a resistor R3 and a capacitor C1 in series, the other end of the capacitor C1 is grounded, a pin 1 of the audio frequency integrated circuit LM386 is connected with a pin 8 of the electrolytic capacitor EC2 in parallel, a pin 6 of the audio frequency integrated circuit LM386 is connected with a pin 6 of a six inverter circuit LM 4014, the pin 6 of the audio integrated circuit LM386 is respectively connected with an electrolytic capacitor EC4 and a capacitor C4 in series, and the other ends of the electrolytic capacitor EC4 and the capacitor C4 are both grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011417027.2A CN112672252B (en) | 2020-12-07 | 2020-12-07 | Hearing aid circuit for medical bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011417027.2A CN112672252B (en) | 2020-12-07 | 2020-12-07 | Hearing aid circuit for medical bed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112672252A CN112672252A (en) | 2021-04-16 |
| CN112672252B true CN112672252B (en) | 2022-07-22 |
Family
ID=75401334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011417027.2A Active CN112672252B (en) | 2020-12-07 | 2020-12-07 | Hearing aid circuit for medical bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112672252B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5511132A (en) * | 1992-08-31 | 1996-04-23 | Pioneer Electronic Corporation | Communication device having air-borne and solid-borne transmitting and receiving devices |
| CN201426170Y (en) * | 2009-05-25 | 2010-03-17 | 南靖万利达科技有限公司 | Control circuit of loudspeaker capable of earphone-plug-in automatic mute |
| EP2262209A3 (en) * | 2009-06-09 | 2012-05-02 | Samsung Electronics Co., Ltd. | Apparatus and method for outputting audio signal in portable terminal |
| CN202663540U (en) * | 2012-05-11 | 2013-01-09 | 吴忠义 | Bionic intelligent hearing aid |
| CN103108276A (en) * | 2013-02-26 | 2013-05-15 | 姜秀坤 | High-performance electronic hearing aid |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10126466A (en) * | 1996-10-18 | 1998-05-15 | Saitama Nippon Denki Kk | Portable telephone set |
| JP2006230755A (en) * | 2005-02-25 | 2006-09-07 | Keakomu:Kk | Nurse call cordless handset with hearing aid function |
| TW201014371A (en) * | 2008-09-16 | 2010-04-01 | guo-shu Zheng | Earphone device having sound box function |
| CN205454077U (en) * | 2015-12-30 | 2016-08-10 | 深圳市冠旭电子股份有限公司 | NOISE -CANCELLING HEADPHONES and audio input switching circuit thereof |
| CN106356082A (en) * | 2016-09-26 | 2017-01-25 | 北京小米移动软件有限公司 | Control method, control system and corresponding device |
| US11113935B2 (en) * | 2019-04-15 | 2021-09-07 | Stryker Corporation | Patient support apparatuses with nurse call audio management |
| CN211184222U (en) * | 2020-03-29 | 2020-08-04 | 深圳市能战科技有限公司 | Bluetooth headset with hearing aid and personal karaoke function |
| CN112040383A (en) * | 2020-08-07 | 2020-12-04 | 深圳市微纳集成电路与系统应用研究院 | Hearing aid device |
-
2020
- 2020-12-07 CN CN202011417027.2A patent/CN112672252B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5511132A (en) * | 1992-08-31 | 1996-04-23 | Pioneer Electronic Corporation | Communication device having air-borne and solid-borne transmitting and receiving devices |
| CN201426170Y (en) * | 2009-05-25 | 2010-03-17 | 南靖万利达科技有限公司 | Control circuit of loudspeaker capable of earphone-plug-in automatic mute |
| EP2262209A3 (en) * | 2009-06-09 | 2012-05-02 | Samsung Electronics Co., Ltd. | Apparatus and method for outputting audio signal in portable terminal |
| CN202663540U (en) * | 2012-05-11 | 2013-01-09 | 吴忠义 | Bionic intelligent hearing aid |
| CN103108276A (en) * | 2013-02-26 | 2013-05-15 | 姜秀坤 | High-performance electronic hearing aid |
Non-Patent Citations (1)
| Title |
|---|
| 用CMOS门电路制作的助听器;叶启明;《家电检修技术》;20091201(第23期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112672252A (en) | 2021-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202841468U (en) | Bluetooth earphone with hearing-aid and anti-noise functions | |
| CN103237281B (en) | The earphone line control circuit of a kind of mobile terminal and line control method | |
| CN207835740U (en) | A kind of personalized earphone applied to sense of hearing sense organ exception people | |
| CN112672252B (en) | Hearing aid circuit for medical bed | |
| CN201005711Y (en) | Multifunctional combined type stethoscope | |
| CN205195930U (en) | Headset | |
| CN103686574A (en) | Stereophonic electronic hearing-aid | |
| CN2253086Y (en) | Dual track deaf aid | |
| CN203089128U (en) | Sound field audiometry signal output device | |
| CN102469399A (en) | Noise-reduction hearing aid | |
| CN205195931U (en) | Headset | |
| CN203057513U (en) | Wireless hearing aid with playing and recording function | |
| CN207978116U (en) | A kind of multi purpose spatial sound earphone | |
| CN111724802A (en) | Noise removing circuit of stethoscope | |
| CN211606775U (en) | Noise-proof working earplug | |
| CN204581327U (en) | A kind of electronic stethoscope | |
| CN212324363U (en) | Low-power-consumption self-adaptive variable-gain hearing aid | |
| CN213094486U (en) | Personalized hearing compensation device | |
| CN203057514U (en) | Hearing aid with playing and recording function | |
| CN211723223U (en) | Stethoscope with sound amplification and intelligent recognition functions | |
| CN211406277U (en) | High-tone-quality sound hearing aid circuit | |
| CN213070619U (en) | Noise removing circuit of stethoscope | |
| CN217162112U (en) | Audiometer main control circuit and audiometer | |
| CN203057512U (en) | Hearing aid for input of multiple sources of sound | |
| CN211089899U (en) | Bone conduction device and communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230517 Address after: Room B507-23, Building 19, Innovation and Entrepreneurship Plaza, Science and Technology Innovation City, High tech Development Zone, Harbin City, Heilongjiang Province, 150028 (No. 699 Chuangxin 1st Road) Patentee after: Harbin yannuo Biotechnology Co.,Ltd. Address before: 200433 room 2003, 2nd floor, building 3, No.2, Lane 1135, Baotou Road, Yangpu District, Shanghai Patentee before: Ruan Lanmin |