CN215348997U - Wireless transmission electrocardiograph - Google Patents

Wireless transmission electrocardiograph Download PDF

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Publication number
CN215348997U
CN215348997U CN202120777461.5U CN202120777461U CN215348997U CN 215348997 U CN215348997 U CN 215348997U CN 202120777461 U CN202120777461 U CN 202120777461U CN 215348997 U CN215348997 U CN 215348997U
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China
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wireless
module
electrocardiograph
wireless transmission
lead
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CN202120777461.5U
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Chinese (zh)
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朱梅生
王军
张雷
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First Affiliated Hospital of Xinjiang Medical University
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First Affiliated Hospital of Xinjiang Medical University
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Abstract

A wireless transmission electrocardiograph comprises a wireless lead device and an electrocardiograph. The electrocardiogram instrument comprises wireless lead equipment and an electrocardiogram instrument, wherein the wireless lead equipment comprises lead electrodes, a wireless transmission module, a wireless receiving and transmitting module and a battery; the electrocardiograph internally comprises another wireless transceiver module, a 5G communication unit, a signal processing unit, a data processing module and a data storage module. Compared with the prior art, the utility model has four advantages: 1) the entanglement and the difficult disinfection of the lead of the traditional electrocardiograph are avoided, the operation is more convenient and faster, and the disinfection is more convenient; 2) the body surface electrode made of silicon cemented alloy avoids the signal interference caused by the over-thin or over-small body size of the patient on the electrode ball-sucking metal part of the traditional electrocardiograph; the slow desorption is realized through the exhaust device, so that the pain of a patient can be relieved; 3) the electrode device can effectively improve the sensitivity and stability of signal conduction; 4) the cleanliness and the cleaning efficiency of the electrocardiograph are improved, and virus diffusion caused by untimely cleaning is avoided.

Description

Wireless transmission electrocardiograph
Technical Field
The utility model relates to the technical field of wireless communication, in particular to a wireless transmission electrocardiograph.
Background
Electrocardiography (ECG) is a technique for recording a pattern of changes in the activity of bioelectric potentials generated every cardiac cycle of the heart from the body surface using an electrocardiograph.
In the prior art, the lead electrode of the electrocardiogram consists of an air bag, an electrode plate and a metal sucker, the metal sucker is adsorbed on the skin after the air bag is pressed, and the electrode plate conducts electricity to transmit signals to a test instrument. The disadvantages of this structure are: during testing, the metal sucker and the electrode plate are both of metal structures, so that the metal sucker and the electrode plate are poor in sealing performance, difficult to adsorb on skin and easy to fall off, and often interfered by other external factors such as human clothes or an electrocardiogram monitoring lead wire, inaccurate detection data are caused, and the diagnosis of a doctor on the state of an illness of a patient is influenced; in addition, the conventional electrocardiogram leads the structure and measures and need disinfect it after accomplishing, because it is more to lead the circuit, it is very troublesome to the disinfection process of the circuit of leading, and when patient is more, if appear disinfecting inadequately then arouse patient's infection easily, for example in epidemic prevention and control period, in treating new crown patient's ICU ward, often need look over patient's rhythm of the heart, and current electrocardiograph needs the disinfection just can be used for another patient after using at every turn, cause cross infection easily and work efficiency is lower.
In addition, after the lead electrodes of the conventional wired transmission electrocardiograph are adsorbed on the skin of a human body, the sleeping posture of a patient is difficult to adjust; if the patient adjusts the sleeping posture, then lead the stranded circuit that leads to easily and twist together, because moment effect can cause the partial electrode adsorption head in the electrocardio inspection process to drop, lead the electrode if adsorb insecure, can lead to the electrocardio detection precision to descend, and lead the electrode if firmly adsorb on human skin, when lead the electrode adsorption head and pull out, cause patient's painful sense easily, cause patient uncomfortable.
Therefore, in summary, it is a technical problem to be solved in the art to provide a novel electrocardiograph which is easy and fast to operate, does not damage the patient, can avoid cleaning and disinfecting the lead wires, and improves the working efficiency.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a wireless transmission electrocardiograph, which solves the above problems listed in the background art.
A wireless transmission electrocardiograph comprises a wireless lead device and an electrocardiograph. The wireless lead equipment comprises a lead electrode, a wireless transmission module, a wireless transceiving module and a battery; the electrocardiograph internally comprises another wireless transceiving module, a 5G communication unit, a signal processing unit, a data processing module and a data storage module, and the external equipment of the electrocardiograph comprises a key operation unit, a power supply unit and a display. In the wireless lead equipment, a lead electrode is electrically connected with a wireless transmission module, the wireless transmission module is electrically connected with a wireless receiving and transmitting module, and a battery supplies power to the lead electrode, the wireless transmission module and the wireless transmission module; in the electrocardiogram instrument, a wireless transceiver module is electrically connected with a 5G communication unit, the 5G communication unit is electrically connected with a signal processing unit, the signal processing unit is electrically connected with one input end of a data processing module, the other input end of the data processing module is electrically connected with a data storage module, the output end of the data processing module is connected with a display, and the display is used for displaying electrocardiogram waveforms.
The signal processing unit of the wireless transmission electrocardiograph corresponds to a corresponding circuit diagram of the signal processing unit, and the circuit comprises: a first operational amplifier AM1, a second operational amplifier AM2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a parallel resistor Rc, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first comparator CO1, a second comparator CO2, a dummy transistor M1, a transistor M2, a first diode L1, and a second diode L2;
the non-inverting input end of the first operational amplifier AM1 is connected with the input end Vin of the signal processing unit (namely, the electrocardio analog signal); the output end of the first operational amplifier AM1 is connected with the output end of the signal processing unit, and the output end of the first operational amplifier AM1 is the electrocardiosignal obtained by amplifying the collected electrocardiosignal and reducing the noise; the inverting input end of the first operational amplifier AM1 is connected with a direct current set voltage end Vs through a first resistor R1, and is also connected with the output end of the second operational amplifier AM2 through a second resistor R2; the non-inverting input terminal of the second operational amplifier AM2 is connected to the output terminal of the first operational amplifier AM1 through a fourth resistor R4, and is also connected to a dc set voltage terminal Vs through a third resistor R3; the inverting input terminal of the second operational amplifier AM2 is connected to the output terminal of the second operational amplifier AM2 through a first capacitor C1, and is also connected to the transistor M2 through a parallel resistor Rc; the inverting input terminal of the second operational amplifier AM2 is also connected with the transistor M2;
the positive input end of the first comparator CO1 is grounded through a seventh resistor R7, and is also connected with the negative input end of the second comparator CO2 through a sixth resistor R6; the negative input end of the first comparing unit CO1 is connected to the positive input end of the second comparing unit CO2 and the output end of the first operational amplifier AM1, respectively, the output end of the first comparator CO1 is connected to M2 through a first diode L1, and is also grounded through a third capacitor C3; the inverting input terminal of the second comparator CO2 is connected to the power supply voltage Vcc through a fifth resistor R5; the output terminal of the second comparator CO2 is connected to the transistor M2 through a second diode L2 and also to ground through a third capacitor C3.
In the circuit diagram of the signal processing unit, the first operational amplifier AM1 is a main channel operational amplifier, the second operational amplifier AM2 is a feedback operational amplifier, and constitutes an integral feedback circuit, as shown in fig. 2, three diodes constitute a corresponding virtual transistor M1, the virtual transistor M1 and the first capacitor C1 can provide an extremely low high-pass cut-off frequency, the first comparator CO1, the first comparator CO2 and the transistor M2 constitute a de-blocking circuit, and the problem that the response time is too slow due to the extremely low cut-off frequency is solved, Vin is the acquired electrophysiological signal, Vs is a direct current reference voltage, and Vout is the output voltage of the operational amplifier.
The wireless lead equipment comprises a lead electrode, a silica gel sucker, a base body, an exhaust device, a protection head, an emission head, a wireless receiving and transmitting module, a wireless transmission module, a battery pack and a current collection joint; wherein, the electrode setting of leading of array form is in one side that the current collection connects, the opposite side setting that the current collection connects with the group battery electricity is connected, the group battery still with wireless transceiver module, wireless transmission module electricity are connected, wireless transmission module is connected with the transmission head, wireless transceiver module, wireless transmission module, group battery and current collection connect all set up in the protection head, the bottom and the silica gel sucking disc fixed connection of bowl form of protection head, the surface of silica gel sucking disc still is provided with an exhaust apparatus. Preferably, the exhaust device is composed of an exhaust port and an exhaust cover plate, the exhaust cover plate is hinged on the outer side of the exhaust port, and the exhaust port can be closed through the exhaust cover plate.
In the actual use process of the wireless lead equipment, the exhaust cover plate is opened, the wireless lead equipment is pressed close to the skin of a patient, medical staff/the patient presses the silica gel sucker to extrude the air in the silica gel sucker and then quickly cover the exhaust cover plate to seal the exhaust port, so that the wireless lead equipment can be adsorbed on the skin of a human body; when the electrocardiographic detection is finished, the medical staff/patient opens the exhaust cover plate, and the external air enters the silica gel sucker, so that the silica gel sucker is separated from the skin of a human body.
After the electrocardiographic detection is finished, the medical staff removes all the wireless lead equipment from the patient body and puts the wireless lead equipment into the ultrasonic cleaning device for ultrasonic vibration cleaning, so that germs infected on the wireless lead equipment can be effectively reduced/killed.
The wireless transmission electrocardiograph can send detected electrocardiogram data to an electrocardiogram remote treatment center through a wireless transmission module, so that real-time monitoring and analysis of remote electrocardiogram are realized, diagnosis and treatment results can be remotely replied to patients through a wireless network, and remote electrocardiogram diagnosis and treatment are realized. After the data of the electrocardiogram are acquired to the wireless terminal, the data are stored in the wireless terminal according to the requirements, and meanwhile, after the wireless terminal receives the instruction of the electrocardiogram diagnosis and treatment center, the related functions can be completed according to the requirements of the diagnosis and treatment center, so that the real-time monitoring and analysis of the remote electrocardiogram are realized, the detection result is timely replied to the patient through the 5G network, and the electrocardiogram detection efficiency is improved.
In summary, the wireless transmission electrocardiograph disclosed by the present invention has the following advantages compared with the prior art:
1) the entanglement and the difficult disinfection of the lead of the traditional electrocardiograph are avoided, the operation is more convenient and faster, and the disinfection is more convenient;
2) the body surface electrode made of the silicon cemented alloy avoids the signal interference of the metal part of the electrode suction ball of the traditional electrocardiograph caused by the over-thin or over-small body size of the patient; in addition, the bowl-shaped silica gel sucker can improve the adhesion of the device on the body surface, and after the electrocardiographic detection is finished, the device is slowly desorbed through the exhaust device, so that compared with the operation of pulling out the lead equipment immediately after the detection is finished in the prior art, the pain of a patient can be relieved;
3) the traditional electrocardiograph leads are easy to break to cause signal conduction interference or loss, and waste is large at the same time, the utility model adopts 5G communication transmission, and the electrocardiograph electrode device can effectively reduce waste and improve the sensitivity and stability of signal conduction;
4) after the detection is finished, all wireless lead devices can be centralized for disinfection and sterilization, so that the cleanliness and the cleaning efficiency of the conventional electrocardiograph are improved, and virus diffusion caused by untimely cleaning is avoided;
5) the wireless lead equipment and the electrocardiograph realize the information transmission of the electrocardio detection signal based on the 5G technology and the wireless network, the wireless lead equipment can improve the adhesive force through the adsorption of the bowl-shaped silica gel sucker, the adsorption or desorption of the silica gel sucker can be controlled through the exhaust device, the pain of a patient in the process of pulling out the lead equipment after the detection is finished is reduced, and the wireless lead equipment can be sterilized and disinfected by a plurality of methods after the detection is finished, so that the working efficiency of the existing electrocardiograph is improved.
Drawings
FIG. 1 is a block diagram of a wireless transmission electrocardiograph system according to the present invention;
FIG. 2 is a circuit diagram of a signal processing unit according to the present invention;
FIG. 3 is a schematic structural diagram of a wireless lead device according to an embodiment of the present invention;
FIG. 4 is a schematic view of an air vent structure of a wireless lead device according to another embodiment of the present invention;
in the figure, 1-lead electrode, 2-silica gel sucker, 3-base body, 4-exhaust device, 5-protective head, 6-transmitting head, 7-wireless transceiver module, 8-wireless transmission module, 9-battery pack and 10-current collecting joint;
4-1-exhaust port, 4-2-exhaust cover plate, 4-3-coil, 4-4-iron sheet and 4-5-exhaust channel.
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 fig. 1, the wireless transmission electrocardiograph comprises a wireless lead device and an electrocardiograph. The wireless lead equipment comprises a lead electrode, a wireless transmission module, a wireless transceiving module and a battery; the electrocardiograph internally comprises another wireless transceiving module, a 5G communication unit, a signal processing unit, a data processing module and a data storage module, and the external equipment of the electrocardiograph comprises a key operation unit, a power supply unit and a display. In the wireless lead device, the lead electrode is electrically connected with the wireless transmission module, the wireless transmission module is electrically connected with the wireless transceiver module, and the battery (button battery is adopted in the embodiment) supplies power to the lead electrode, the wireless transmission module and the wireless transmission module; in the electrocardiogram instrument, a wireless transceiver module is electrically connected with a 5G communication unit, the 5G communication unit is electrically connected with a signal processing unit, the signal processing unit is electrically connected with one input end of a data processing module, the other input end of the data processing module is electrically connected with a data storage module, the output end of the data processing module is connected with a display, and the display is used for displaying electrocardiogram waveforms.
As shown in fig. 2, the signal processing unit of a wireless transmission electrocardiograph according to the present invention corresponds to a circuit diagram of the signal processing unit, and the circuit includes: a first operational amplifier AM1, a second operational amplifier AM2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a parallel resistor Rc, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first comparator CO1, a second comparator CO2, a dummy transistor M1, a transistor M2, a first diode L1, and a second diode L2;
the non-inverting input end of the first operational amplifier AM1 is connected with the input end Vin of the signal processing unit (namely, the electrocardio analog signal); the output end of the first operational amplifier AM1 is connected with the output end of the signal processing unit, and the output end of the first operational amplifier AM1 is the electrocardiosignal obtained by amplifying the collected electrocardiosignal and reducing the noise; the inverting input end of the first operational amplifier AM1 is connected with a direct current set voltage end Vs through a first resistor R1, and is also connected with the output end of the second operational amplifier AM2 through a second resistor R2; the non-inverting input terminal of the second operational amplifier AM2 is connected to the output terminal of the first operational amplifier AM1 through a fourth resistor R4, and is also connected to a dc set voltage terminal Vs through a third resistor R3; the inverting input terminal of the second operational amplifier AM2 is connected to the output terminal of the second operational amplifier AM2 through a first capacitor C1, and is also connected to the transistor M2 through a parallel resistor Rc; the inverting input terminal of the second operational amplifier AM2 is also connected with the transistor M2;
the positive input end of the first comparator CO1 is grounded through a seventh resistor R7, and is also connected with the negative input end of the second comparator CO2 through a sixth resistor R6; the negative input end of the first comparing unit CO1 is connected to the positive input end of the second comparing unit CO2 and the output end of the first operational amplifier AM1, respectively, the output end of the first comparator CO1 is connected to M2 through a first diode L1, and is also grounded through a third capacitor C3; the inverting input terminal of the second comparator CO2 is connected to the power supply voltage Vcc through a fifth resistor R5; the output terminal of the second comparator CO2 is connected to the transistor M2 through a second diode L2 and also to ground through a third capacitor C3.
In the circuit diagram of the signal processing unit, the first operational amplifier AM1 is a main channel operational amplifier, the second operational amplifier AM2 is a feedback operational amplifier, and constitutes an integral feedback circuit, as shown in fig. 2, three diodes constitute a corresponding virtual transistor M1, the virtual transistor M1 and the first capacitor C1 can provide an extremely low high-pass cut-off frequency, the first comparator CO1, the first comparator CO2 and the transistor M2 constitute a de-blocking circuit, and the problem that the response time is too slow due to the extremely low cut-off frequency is solved, Vin is the acquired electrophysiological signal, Vs is a direct current reference voltage, and Vout is the output voltage of the operational amplifier.
Through experimental tests, the equivalent input noise of the lead electrode is 2.2-2.4 uV, and the common mode rejection ratio is 110 dB.
As shown in fig. 3, the wireless lead device of the present invention comprises a lead electrode 1, a silica gel sucker 2, a base body 3, an exhaust device 4, a protection head 5, a transmitting head 6, a wireless transceiver module 7, a wireless transmission module 8, a battery pack 9 and a current collecting joint 10; wherein, the electrode 1 that leads of array form sets up the one side at current collection joint 10, the opposite side setting of current collection joint 10 is connected with group battery 9 electricity, group battery 9 still with wireless transceiver module 7, wireless transmission module 8 electricity is connected, wireless transmission module 8 is connected with emission head 6, wireless transceiver module 7, wireless transmission module 8, group battery 9 and current collection joint 10 all set up in protection head 5, the bottom of protection head 5 and the silica gel sucking disc 2 fixed connection of bowl form, the surface of silica gel sucking disc 2 still is provided with an exhaust apparatus 4. Furthermore, the exhaust device 4 consists of an exhaust port 4-1 and an exhaust cover plate 4-2, the exhaust cover plate 4-2 is hinged on the outer side of the exhaust port 4-1, and the exhaust port 4-1 can be closed through the exhaust cover plate 4-2.
In the actual use process of the wireless lead equipment, the exhaust cover plate 4-2 is opened to enable the wireless lead equipment to be close to the skin of a patient, medical staff/the patient presses the silica gel sucker 2 to extrude the air in the silica gel sucker 2 and then quickly cover the exhaust cover plate 4-2 to seal the exhaust port 4-1, so that the wireless lead equipment can be adsorbed on the skin of a human body; after the electrocardiographic detection is finished, the medical staff/patient opens the exhaust cover plate 4-2, and the silica gel sucker 2 is separated from the skin of the human body due to the fact that outside air enters the silica gel sucker 2.
After the electrocardiographic detection is finished, the medical staff removes all the wireless lead equipment from the patient body and puts the wireless lead equipment into the ultrasonic cleaning device for ultrasonic vibration cleaning, so that germs infected on the wireless lead equipment can be effectively reduced/killed.
The wireless transmission electrocardiograph can send detected electrocardiogram data to an electrocardiogram remote treatment center through a wireless transmission module, so that real-time monitoring and analysis of remote electrocardiogram are realized, diagnosis and treatment results can be remotely replied to patients through a wireless network, and remote electrocardiogram diagnosis and treatment are realized. After the data of the electrocardiogram are acquired to the wireless terminal, the data are stored in the wireless terminal according to the requirements, and meanwhile, after the wireless terminal receives the instruction of the electrocardiogram diagnosis and treatment center, the related functions can be completed according to the requirements of the diagnosis and treatment center, so that the real-time monitoring and analysis of the remote electrocardiogram are realized, the detection result is timely replied to the patient through the 5G network, and the electrocardiogram detection efficiency is improved.
Example 2
The wireless lead device can also search whether the paired controlled devices exist in a preset range by adopting NFC (near field communication). The effective use distance of the NFC technology is within 20cm, the working frequency is 13.56MHz, and the transmission speed comprises 106 Kbit/s, 212 Kbit/s or 424 Kbit/s. Therefore, when the NFC module of the wireless lead device detects the NFC sensor of the paired controlled device, the distance between the NFC module and the paired controlled device is less than 20cm, the NFC sensor is identified as a close range state, and the wireless lead device is connected with the electrocardiograph.
As shown in fig. 3 and 4, the wireless lead device comprises a lead electrode 1, a silica gel sucker 2, a base body 3, an exhaust device 4, a protection head 5, a transmitting head 6, a wireless transceiver module 7, a wireless transmission module 8, a battery pack 9 and a current collection connector 10; wherein, the electrode 1 that leads of array form sets up the one side at current collection joint 10, the opposite side setting of current collection joint 10 is connected with group battery 9 electricity, group battery 9 still with wireless transceiver module 7, wireless transmission module 8 electricity is connected, wireless transmission module 8 is connected with emission head 6, wireless transceiver module 7, wireless transmission module 8, group battery 9 and current collection joint 10 all set up in protection head 5, the bottom of protection head 5 and the silica gel sucking disc 2 fixed connection of bowl form, the surface of silica gel sucking disc 2 still is provided with an exhaust apparatus 4.
The exhaust device 4 consists of an exhaust port 4-1, an exhaust cover plate 4-2, a coil 4-3, an iron sheet 4-4 and an exhaust channel 4-5, the exhaust cover plate 4-2 is hinged to the outer side of the exhaust port 4-1, the iron sheet 4-4 is embedded in the lower portion of the exhaust cover plate 4-2, the coil 4-3 is arranged in the exhaust port 4-1, the coil 4-3 is electrically connected with a battery pack 9 and a switch (not shown in the figure), and the power on or power off of the coil 4-3 is controlled through the battery pack 9 and the switch. When the coil 4-3 is powered on, the exhaust cover plate 4-2 and the exhaust port 4-1 are adsorbed to close the exhaust port 4-1 due to the electromagnetic effect.
The wireless lead equipment further comprises a control device and a deformation detection device, the deformation detection device is electrically connected with the control device, and when the deformation detection device detects that the deformation of the silica gel sucker 2 reaches a set value, the control device controls the coil 4-3 to be powered on, so that the exhaust port 4-1 is automatically closed.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.

Claims (3)

1. A wireless transmission electrocardiograph comprises a wireless lead device and an electrocardiograph, and is characterized in that: the wireless lead equipment comprises a lead electrode, a wireless transmission module, a wireless transceiving module and a battery; the electrocardiograph comprises another wireless transceiver module, a 5G communication unit, a signal processing unit, a data processing module and a data storage module, external equipment of the electrocardiograph comprises a key operation unit, a power supply unit and a display, in the wireless lead equipment, a lead electrode is electrically connected with a wireless transmission module, the wireless transmission module is electrically connected with the wireless transceiver module, and a battery is used for electrically connecting the lead electrode with the wireless transmission module and supplying power to the wireless transmission module; in the electrocardiograph, a wireless transceiver module is electrically connected with a 5G communication unit, the 5G communication unit is electrically connected with a signal processing unit, the signal processing unit is electrically connected with one input end of a data processing module, the other input end of the data processing module is electrically connected with a data storage module, the output end of the data processing module is connected with a display, and the display is used for displaying electrocardiogram waveforms.
2. The wireless transmission electrocardiograph according to claim 1, wherein: the wireless lead equipment comprises a lead electrode, a silica gel sucker, a base body, an exhaust device, a protective head, a transmitting head, a wireless receiving and transmitting module, a wireless transmission module, a battery pack and a current collecting joint; wherein, the electrode setting of leading of array form is in one side that the current collection connects, the opposite side setting that the current collection connects with the group battery electricity is connected, the group battery still with wireless transceiver module, wireless transmission module electricity are connected, wireless transmission module is connected with the transmission head, wireless transceiver module, wireless transmission module, group battery and current collection connect all set up in the protection head, the bottom and the silica gel sucking disc fixed connection of bowl form of protection head, the surface of silica gel sucking disc still is provided with an exhaust apparatus.
3. A wireless transmission electrocardiograph according to claim 2 wherein: the exhaust device consists of an exhaust port and an exhaust cover plate, and the exhaust cover plate is hinged to the outer side of the exhaust port.
CN202120777461.5U 2021-04-15 2021-04-15 Wireless transmission electrocardiograph Expired - Fee Related CN215348997U (en)

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CN202120777461.5U CN215348997U (en) 2021-04-15 2021-04-15 Wireless transmission electrocardiograph

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Application Number Priority Date Filing Date Title
CN202120777461.5U CN215348997U (en) 2021-04-15 2021-04-15 Wireless transmission electrocardiograph

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CN215348997U true CN215348997U (en) 2021-12-31

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Granted publication date: 20211231