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At Home Hospital Equipment Buying Guide

at home hospital equipment fully deserves the fame as one of the most popular products in the market. To make it own unique appearance, our designers are required to be good at observing the design sources and getting inspired. They come up with the far-reaching and creative ideas to design the product. By adopting the progressive technologies, our technicians make our product highly sophisticated and function perfectly.

Manufactured from superior materials with modern technology, hospital furniture manufacturer is highly recommended. It is tested on the international standards instead of the national rules. The design has always been following the concept of striving for first-rate. The experienced design team can better help to meet customized needs. Client's specific logo and design are accepted.

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Technical Requirements of Analog Signal Path in Portable Medical Equipment

The challenge for companies committed to developing medical diagnostic equipment is to provide consumers with high-quality and low-cost products. In terms of reducing medical costs and improving patient care services, the most important thing is to reduce the volume and improve the accuracy of these medical devices. In today's increasingly serious problem of population aging, the above needs are more urgent. According to the imdica report of IMS research company, the total sales of consumer medical devices are expected to exceed US $5 billion by 2011.
With the development and continuous improvement of the monitoring function of medical equipment, telemedicine providers can provide better diagnostic tools for home patients, emergency room paramedics and hospitals in several important areas of human health. Sphygmomanometers, blood glucose meters, defibrillators and other monitoring instruments need clear analog signals for accurate measurement, otherwise they may be life-threatening. The excellent design of analog signal path can help designers reduce the interference of external noise, expand the dynamic range and enhance the accuracy. In addition, in terms of component selection, designers must also choose carefully to meet the performance requirements of the final product.
High performance requirements in small packages
Previously, it was generally believed that medical equipment in hospitals and clinics was more accurate than portable instruments used at home. However, new technological trends are rapidly reversing this view. The users of the new portable medical devices are not only ordinary consumers, but also patients with deep scientific and technological understanding. Therefore, the needs of customers are no longer limited to taking body temperature, ECG and blood pressure. What customers need is a full range of nursing and measurement functions.
In order to meet people's urgent demand for home medical diagnostic instruments, equipment suppliers are relying on advanced inventory management and innovative design to enhance market competitiveness, and equip products with more functions to win more users. In the field of developing home medical instruments, one factor is very important, which is the development time required from the initial design to the real launch of the product. Shortening the time to market can enable manufacturers' products to seize the market. Whether the development cycle can be shortened depends on whether the design of system designers is flexible and cost-effective.
Process technology affects system design
Although electrical specifications are the main factor for designers to select components, the process used to manufacture integrated circuits is also important. For example, a typical blood glucose meter usually needs to be equipped with an operational amplifier with very low input bias current. Most designers will choose JFET amplifier. However, they should consider the temperature before making a decision.
Because JFET has a very low initial input bias, it is vulnerable to temperature changes. For every 10 C rise, the input bias will approximately double. To calculate the drift of the input bias, use the following formula (reference 1).
Ib(T)Ib(T0) x 2(T-T0)/10
For example, a JFET Input Operational Amplifier (such as National Semiconductor's lf411) has an input bias current of 50pA at 25 C, while a better option is National Semiconductor's lmp7731, which is a bipolar input operational amplifier with an input bias current of 1.5na. Through the above formula, we can quickly calculate that the input bias current of lf411 becomes 3.2na at 85 C, which is twice that of lmp7731.
Trade off of evaluation system
Speed, noise and power consumption may be equally important for some designs. A low-noise device will consume more current, while a low-power device can only provide limited bandwidth. One way to overcome these problems is to use inverse compensation amplifiers in appropriate applications. Compared with the stable unit gain and high speed, the advantage of the anti compensation amplifier is that it can provide a large bandwidth without affecting the power consumption.
Inverse compensation operational amplifier is most suitable for current voltage conversion (transimpedance) circuit. In medical instruments, one of the most common applications is to measure the oxygen content in blood cells, which is called SpO2 or saturated or peripheral oxygen. Figure 1 shows the block diagram of SpO2 module, in which the anti compensation amplifier (TIA) is used to convert the current from the photodiode into voltage.
Figure 1 typical block diagram of SpO2 module
Use shortcuts to shorten design time
The most important parameter of medical instruments is noise, which can cause serious interference to the circuit itself and nearby equipment. Calculating noise is a tedious task, especially when you want to calculate the overall impact of signal path on signal-to-noise ratio from power supply, amplifier, data converter and external components.
Generally speaking, medical instrument circuits tend to work at a lower frequency, so the designers of these systems usually pay more attention to the noise in the frequency band of 0.1 to 10Hz, also known as peak to peak noise. Unfortunately, some data sheets do not provide time domain noise (peak to peak) values, but only typical charts of voltage or current noise density. In addition to waiting for the circuit supplier to provide measurement data, there is a fast method to help calculate the peak to peak noise.
Suppose you intend to use lmp7731 of national semiconductor to calculate the noise of peak to peak (0.1 to 10Hz) voltage. First, select a point in the frequency range within the specified frequency band, such as 1Hz, and the value in the comparison curve is 5.1nv / Hz (Fig. 2). Then use the following formula to calculate the root mean square value (RMS) of noise: Formula 1: ENRMS = "enf" ln (10 / 0.1), Where enf is the noise at 1Hz. The total root mean square noise of 10.9nv can be obtained through the above formula. If you want to calculate the peak to peak noise, you only need to multiply this root mean square value by 6.6 to obtain 72.2nv. The result of this estimation is quite good, which is close to the specification 78nv listed in the data sheet.
Fig. 2 Relationship between input voltage noise and frequency of lmp7731 frequency and voltage noise
If the voltage noise density diagram in the data sheet does not represent the noise value at 1Hz, you can use the following simple equation (equation 2) to calculate the value at a certain frequency.
Where ENB is broadband noise (usually the value at 1kHz), and FCE is the 1 / F inflection point. As for F is the frequency of interest, in our case, it is 1Hz.
For example, the broadband noise of lmv851 of national semiconductor is 10nv / Hz at 10kHz. In order to calculate the root mean square noise, first determine the value of 1 / F inflection point (FCE) from the chart. Using the voltage noise density diagram in the data sheet, it can be found that FCE is approximately equal to 300Hz. Then, using the above formula, we can calculate en = 10 * (300 / 1) = 173nv Hz, which is the voltage noise at 1Hz. Finally, substitute this value into Formula 1 and multiply the result by 6.6 to get 2.4 Peak to peak noise of V.
Another consideration is current noise. Generally speaking, if the impedance of the power supply is not very large (> 100k ), you can still get a very close calculation result without considering the current noise, just like the above example. However, if the impedance of the power supply is large, the same technique must be used to calculate the current noise, and the voltage and current noise must be added in the form of root mean square value.
Requirements for determining speed
Just as the noise of operational amplifier is very important to the resolution of ADC, so is the bandwidth to maintain the accuracy of the system. In order to limit the error to 1 / 2 least significant bit (LSB), a fast check is needed to determine whether the bandwidth of the amplifier is sufficient. In addition to using complex and generic guidance, you can also use the resolution of the analog / digital converter to quickly calculate the results. The method is to use 1 / 2 (n / 2) and multiply the result by the amplifier frequency at - 3dB (reference 2).
Through the above shortcut and a 14 bit ADC, FEFF = 0.007813 * f-3db is obtained in this example. For the operational amplifier (LMP7711) with configurable gain of 10 in Fig. 3, the frequency at - 3dB is 1.7MHz. In this way, the maximum bandwidth (at 1 / 2 LSB error) is equal to 0.007813 * 1.7e6 = 13.3khz.
Fig. 3 block diagram of portable electrocardiograph
Monitor device and communication device
Most of the newer medical diagnostic instruments are equipped with wireless communication function. Modern electrocardiograph (EKG or ECG) can transmit patient data to doctor's clinic or hospital in a few minutes through personal electronic manual account (PDA) or other computer peripherals. Despite the benefits of wireless data transmission, such devices may cause serious interference to medical devices and make their readings wrong.
In order to avoid this interference, a filter must be used. However, adding filters will not only increase the volume of the equipment, but also increase the design cost. A more cost-effective and fast way is to use components (including filters) that can suppress radio frequency (RF) noise.
epilogue
Nowadays, the trend in the field of medical equipment is to provide consumers with higher value products, that is, home care instruments that are cheap and high-quality and can quickly provide diagnostic results. With the continuous progress of technology, more and more medical devices will transmit data from patients' homes to doctors' clinics in real time through computers. In addition, with the demand of users for more functions, the accuracy requirements for portable medical devices will be further improved to achieve more accurate diagnosis, which will rely on the continuous innovation, long-term development and commitment to comprehensive solutions made by designers.

DEKRA Dekai Guangzhou Medical Laboratory Has Obtained CNAs Qualification to Expand the Recognition Scope of Medical Equipment

Recently, DEKRA Dekai Guangzhou Medical Laboratory successfully obtained the approval of China National Accreditation Commission for conformity assessment (CNAs), expanding the accreditation scope of medical equipment, including more than 80 standards such as IEC, en, BS, ISO, ANSI / AAMI, can / CSA, GB and YY.
CNAs is a member of ILAC and APLAC. The approval of the CNAs expansion fully affirmed the testing service technical ability of DEKRA Dekai Guangzhou Medical Laboratory, and improved the international mutual recognition of DEKRA Dekai Guangzhou Medical Laboratory. As an inspection, testing and certification institution with two notified bodies of EU medical directives (0344 in the Netherlands and 0124 in Germany), DEKRA Dekai can provide better and convenient services for the export trade of medical device enterprises.
CNAs accreditation scope of the laboratory
Include (but not limited to) the following medical equipment
General requirements for safety of medical electrical equipment IEC 60601-12012 a2:2020,
EN 60601-12013A12:2014,
ANSI/AAMI ES60601-1,
CAN/CSA-C22.2 NO. 60601-1:14,
Electromagnetic compatibility of medical electrical equipment
IEC 60601-1-22020,
EN 60601-1-2:2015,
BS EN 60601-1-2:2015
Availability of me equipment
IEC 60601-1-62013A2:2020,
EN 60601-1-62015,
CAN/CSA-C22.2 No. 60601-1-6A:11,
IEC 62366-12020,
EN 62366-12020,
CSA IEC 62366-1:15 (R2020),
ANSI/AAMI/IEC 62366-1: 2015A1:2020,
YY/T 1474-2016
Medical electrical equipment alarm system
IEC 60601-1-82012,
EN 60601-1-82013,
ANSI/AAMI/IEC 60601-1-82012,
CAN/CSAC22.2 No.60601-1-8-08A1:2014,
YY 0709-2009
Environmental awareness and design of medical electrical equipment
IEC 60601-1-92013A2:2020,
EN 60601-1-92013,
CAN/CSA C22.2 No. 60601-1-9:15
Physiological closed loop controller system for medical electrical equipment
IEC 60601-1-102013A2:2020,
EN 60601-1-102015,
CSA C22.2 No. 60601-1-10A:09 (R2020)
Medical electrical equipment household environment
IEC 60601-1-112020,
EN 60601-1-11:2015,
ANSI/AAMI HA60601-1-11:2015,
CSA-C22.2 No.60601-1-11:15
Medical electrical equipment emergency medical service environment
IEC 60601-1-122020,
EN 60601-1-122020,
ANSI/AAMI/IEC 60601-1-12:2016,
CSA-C22.2 No.60601-1-12:15(R2020)
nerve & muscle stimulator
IEC 60601-2-102016,
EN 60601-2-102016,
CAN/CSAC22.2 No.60601-2-102018
Endoscopic equipment
IEC 60601-2-18:2009,
EN60601-2-18:2015,
CAN/CSA-C22.2 No.60601-2-18:11
Automatic noninvasive sphygmomanometer
IEC 80601-2-30:2018,
EN IEC 80601-2-30:2019,
ANSI/AAMI/IEC 80601-2-30:2018,
CSA C22.2 No. 80601-2-30:19
Ultrasonic diagnosis and monitoring equipment
IEC 60601-2-372015,
EN 60601-2-372015,
CSA-C22.2 No. 60601-2-372019,
GB 9706.237-2020
Operating lamp and diagnostic lamp
IEC 60601-2-412013,
EN 60601-2-412011A1:2015
Multifunctional patient monitoring equipment
IEC 80601-2-49:2018,
EN IEC 80601-2-49:2019
Clinical thermometer
ISO 80601-2-562018,
EN ISO 80601-2-562020
Temperature screening equipment
IEC 80601-2-59:2017,
EN IEC 80601-2-59:2019,
CSA C22.2 No. 80601-2-59:10
Dental equipment
IEC 80601-2-60:2019,
EN IEC 80601-2-60:2020,
CSA C22.2 No. 80601-2-60:14
oxygenerator
ISO 80601-2-69:2014,
ISO 80601-2-69:2020,
EN ISO 80601-2-69:2014,
CAN/CSA-C22.2 No.80601-2-69:16
Rehabilitation robot
IEC 80601-2-78:2019,
EN IEC 80601-2-78:2020,
ANSI/AAMI/IEC 80601-2-78:2020,
CSA C22.2 No. 80601-2-78:19
Household phototherapy equipment IEC 60601-2-83:2019, en IEC 60601-2-83:2020 safety requirements for laboratory and in vitro diagnostic (IVD) equipment
IEC/EN 61010-1,
IEC/EN/CSA/UL 61010-2-010,
IEC/CSA 61010-2-051,
IEC/EN/CSA/UL 61010-2-081,
IEC/EN/CSA/UL 61010-2-101
Electromagnetic compatibility requirements for laboratory and in vitro diagnostic (IVD) equipment
IEC 61326-1:2012/EN 61326-1: 2013,
BS EN 61326-1:2013,
IEC 61326-1:2020,
IEC 61326-2-6:2012/EN 61326-2-6: 2013,
IEC 61326-2-6:2020,
BS EN 61326-2-6:2013
Why
DEKRA Dekai medical device service
Extensive testing services include electrical safety, performance, electromagnetic compatibility, wireless connection, functional safety, network security (IEC 62443-4-1 / 4-2, IEC 80001, UL 2900-2-1 and IEC / TR 60601-4-5), chemistry (RoHS / reach), etc. A wide range of certification services include Ce (MDR, IVDD and ivdr) certification (two bulletin bodies: Netherlands 0344 and Germany 0124), CB certification, Inmetro certification, NRTL certification, QMS quality system (ISO 1348, mdsap, TCP), etc. The qualification scope of MDR covers class III medical devices, and the qualification scope of ivdr covers class D in vitro diagnostic devices.
About DEKRA Dekai
DEKRA Dekai has been committed to safety for nearly 100 years. The German motor vehicle supervision Association, established in Berlin, Germany in 1925, is now a world-famous third-party professional testing and certification organization. In 2020, DEKRA Dekai's total business volume reached about 3.2 billion euros. Its business covers more than 60 countries and regions on six continents in the world, and more than 47000 employees are committed to providing independent expert services for safety on the road, at work and at home. These services include: vehicle inspection, claim settlement and expert evaluation, product testing, industrial inspection, consulting, audit, training and temporary employment. In 2025, DEKRA Dekai will celebrate its 100th anniversary. Its vision is to "become a global partner in a safe, reliable and sustainable world.

DEKRA Dekai Guangzhou Medical Laboratory Has Obtained CNAs Qualification to Expand the Recognition Scope of Medical Equipment

Discussion on the Technology of Analog Signal Path in Portable Medical Equipment

Simple, Efficient and Low Cost, Sunflower Control A2 Realizes Remote Operation and Maintenance and Operation Guidance of Medical Equipment!

With the rapid development of hospitals, the demand for medical equipment in hospitals is increasing. Modern medical equipment has become a medical equipmentIt is an important symbol of hospital modernization and a powerful means for major hospitals to participate in market competition. In order to improve the medical level and market competitiveness, more and more high-quality, precision and advanced medical equipment have been put into use, which has continuously promoted the development of advanced medical technology.However, the use of high-end medical equipment also brings new challenges to doctors due to complex operation. In the use of equipment, doctors often need the technical personnel of the equipment manufacturer to give operation guidance. Moreover, the manufacturer may have to send technical personnel to the hospital site for equipment update and maintenance, which will not only consume a lot of time and labor cost, but also affect the normal use of the hospital and delay the timely treatment of patients.

Facing the needs of real-time operation guidance and efficient operation and maintenance of medical equipment, aiming at the hospital private network environment and domestic well-known remote control brand sunflower, a physical layer remote control solution - control A2 is given.

The deployment of control A2 is simple and easy to use. Just connect the power supply to the control, connect one end of the USB data cable provided by the control to the control usb-b interface, and the other end to the medical equipment (virtual mouse and keyboard function), connect the HDMI adapter line to the control and medical equipment (output the master image of the controlled equipment), and then connect it to the control A2 through the hospital external network special line or 4G network card, After the medical equipment end is ready, the manufacturer's technicians only need to install the sunflower remote control software and remotely connect the control through the functions of [desktop control], [camera], [SSH] to realize the efficient remote operation and maintenance and operation guidance of the medical equipment.

Flexible Internet access, not limited by the hospital's private networkSunflower control A2 supports three networking modes: wired, WiFi and 4G network card, which does not change the network environment of medical equipment. Whether it is connected to the network cable or connected to the Internet through WiFi or network card, it is control A2 that receives the network signal, which is independent of the medical equipment network and gets rid of the problem of limited hospital network.Plug and play, the hospital controls the use right

As a pure hardware external remote control tool, control A2 is small and exquisite, plug and play. If doctors need operation and maintenance troubleshooting in case of operation problems or equipment faults, they only need to connect control A2 to the medical equipment and notify the manufacturer's technicians for remote connection. After use, the hospital can unplug the control in time. The whole process is led by the hospital to ensure the safety of medical information.High compatibility, not limited by equipment systemControl A2 is the physical layer link of intelligent hardware. It does not need to install any software and is compatible with a variety of operating systems. No matter what operating system is used for medical equipment, it is not limited by the system and can quickly realize intelligent remote control.

With camera and whiteboard, remote guidance is more convenientThe USB interface of control A2 supports an external camera. In the remote operation guidance, the camera can help the technicians of the equipment manufacturer understand the operation details of the doctor in real time and help the technicians better carry out remote guidance; In particular, with the sunflower remote control software, the "whiteboard" function can be opened in the remote control, and the operation demonstration can be carried out through the whiteboard, so that technicians can solve the operation problems more conveniently and intuitively when guiding doctors to operate the equipment remotely.Cross platform use, mobile phone / tablet / PC remote operation anytime, anywhere

Sunflower supports flexible login on mobile phones, iPads, PCs and other platforms. No matter where the technicians are, they can quickly log in to the sunflower control terminal through their portable devices as long as they have a network, so as to provide doctors with remote operation guidance and equipment operation and maintenance in real time.It is worth mentioning that the sunflower data transmission adopts AES / RSA 256 bit asymmetric algorithm encryption and double authentication of user information, which realizes the encryption protection of user information and session, and comprehensively ensures the information security of the hospital.Through the sunflower control A2 solution, medical equipment manufacturers have perfectly solved the problems of remote operation and maintenance and operation guidance of medical equipment. Control A2 is simple and easy to use, with low cost, greatly saving operation and maintenance cost, and the deployment is flexible and highly controllable, meeting the strict requirements of the hospital for safety problems and realizing mutual benefit and win-win.

Moreover, as a powerful physical layer remote control hardware, sunflower control A2 has been successfully practiced in the fields of remote consultation, remote operation live broadcast, remote operation and maintenance of medical information management system, and provides a simple, easy-to-use, safe and reliable low-cost solution for telemedicine.About sunflower remote control

Sunflower is the only remote control service provider with integrated software and hardware in China. It has been deeply engaged in the remote industry for more than 10 years. It has independently developed sunflower remote control software and a variety of intelligent hardware such as start-up stick, start-up socket and control. It crosses the mainstream operating system and penetrates all kinds of complex network environment to provide safe, efficient and Stable customized full surround remote control solution; With a high degree of technological innovation ability, it has pressed similar products at home and abroad, provided high-quality remote control services for 120 million hosts, 30 million users and 50000 enterprises, and reached cooperation with well-known government and enterprise institutions such as Changhong, Huawei, Midea, China Communications, Chinese Academy of Sciences, Peking University and Shanghai Jiaotong University, which has been highly recognized by the majority of users.

About At Home Hospital Equipment Buying Guide

at home hospital equipment is famous for its unique design and high performance. We cooperate with reliable leading raw materials suppliers and choose the materials for production with extreme care. It results in the strengthened long-lasting performance and long service life of the product. To stand firmly in the competitive market, we also put a lot of investment into the product design. Thanks to the efforts of our design team, the product is the offspring of combining art and fashion.

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