Patient monitoring devices are often used to measure vital signs of a patient, such as blood pressure, heart rate and other parameters. The requirements for managing this important data go far beyond simple inventory control, requiring devices to provide device inspection, calibration and self-test results , and features security upgrades while minimizing equipment downtime. Maintenance personnel often stick labels that record maintenance data on the equipment. Due to the need to record a large amount of data, the labels are gradually damaged after a period of time. Label stickers are no longer a reasonable choice. With the rapid development of technology, patient monitoring equipment often requires software upgrades.

Unlike static label stickers, dynamic dual-interface RFID EEPROM Electronic label solutions can record measurement parameters for later reading, and can also enter new data into the system, such as calibration constants and inspection information, without any external external connection. Connector. The dual-interface electronic tag can be connected to the patient monitoring device through the I2C interface. When the device is running, the device can read and write the electronic tag through the I2C interface. Even if the patient monitoring equipment is not working, the medical staff can read and write the data of the electronic tag through a common electronic tag reader that conforms to the ISO 1569313.56 MHz RFID standard, because it can ensure that the data is up-to-date, safe, and read and write at any time. Dual-interface memory Make the RFID technology chain more perfect.

Target applications for dual-interface passive RFID systems include equipment maintenance conditions and records, authorized accessory verification, sensors, counterfeit goods identification, single-use item reuse control, and the addition of new authorized products. When the monitoring device is working or in standby, the operator can read and write the data in the dual-interface RFID through the monitoring device. When the device is turned off, the operator can use the electronic tag reader to manage the data in the dual-interface RFID. This big advantage is that Designers open up more opportunities.

Patient Surveillance System Classification

Patient monitoring systems generally fall into three broad categories: bedside monitors, portable handheld monitors, and body-worn monitors.

Bedside monitors play an important role in providing diagnostic information for medical monitoring and provide an increasing proportion of the monitoring information required by healthcare professionals. Bedside monitoring devices are often installed in critical intensive care areas, such as intensive care units, and most bedside monitoring devices are currently connected to the central monitoring system through the hospital network, exchanging data through the facility network.

The management of portable monitors can be challenging, as such devices appear to be able to “leave the group or even get lost.” While looking at the device location is beyond the scope of this article, knowing what’s going on with the device can be of great help in ensuring that the device continues to meet compliance and verifying the device owner’s identity.

Although the body-worn monitor is not a new invention, with the upgrading of products, the measurement method and the amount of data are rapidly increasing, which is exactly where a dual-interface RFID solution comes in. Acting as a gateway to the inner workings of the system, a dual interface RFID solution connects to monitoring equipment without tangled cables, thus increasing the usefulness and longevity of the monitor.

Body-worn monitors can also be subdivided into the following categories:

· Mobile/Wearable Personal Monitors (MPMs): Wearable personal monitoring devices monitor the vital signs activities of chronically ill patients in real time and store and forward measurement data or alarms.

· Mobile Aggregators: Smartphone-like devices with or without external sensors capable of reporting patient status via mobile wireless technology.

Wearable healthcare devices: Healthcare devices worn on the wrist/arm/chest or sensors embedded in the fabric of shoes and shirts to detect vital activity characteristics such as heart rate, respiration, pace, etc.

· Remote Patient Management (RPM) Devices: Special monitoring devices with built-in patient-specific sensors. Equipped with sensors customized by the hospital for the patient, these systems can report all vital signs parameters, such as heart rate, and the patient’s posture (standing or lying down).

Whether it’s a bedside monitor or a portable or wearable monitor, all patient monitoring devices face a common challenge: How do you keep the device up-to-date with software, calibration data, or maintenance records? How to find faulty equipment?

The benefits of managing system data

A simple equipment failure can have a huge impact on patient test report results. Not surprisingly, monitoring equipment backup battery failures consistently top the list of issues that have plagued the industry for years. The system self-check does not alarm when it should be alarmed, and alarms when it should not. For bedside monitoring equipment, the central monitoring function can report faults and send maintenance personnel to troubleshoot, so that serious problems can be avoided.

Portable and body-worn monitoring devices present designers with a more challenging set of problems. One of the problems is that these two devices are the fastest growing markets, and interoperability standards haven’t really been in the spotlight until recently. For example, recently, the Continua Health Alliance designated four primary interoperability interfaces: USB, Bluetooth, Bluetooth Low Energy (BTLE), and ZigBee. What these four interface technologies have in common is that the monitoring device must be powered on and running (that is, performing the monitoring function) in order to report faults through these interfaces, indicating that the device is working properly. When these devices are turned off, monitors are often disconnected from error messages, making it harder to reduce or even find any problems.

Portable and body-worn monitoring devices also have another emerging challenge. In order to be waterproof and dust-proof, easy to clean, and not damage electronic components, today’s portable and body-worn monitoring devices are integrally sealed. , in this case, adding connectors or adding functions to the connectors is bound to increase the size, cost or system complexity of the sensor port.

Read and write related data

Having readable and reliable traceable product information data to understand all product information from production line to working condition is very useful for managing and operating these assets (monitoring equipment). For a long time, equipment manufacturers have used codes on label stickers to concisely describe product information such as manufacturing date, revision, production line/factory, serial number, etc., and then stick these labels on related products. This kind of data is quality control. Basic information required to trace back with device information.

Today’s systems require data such as option configuration, multiple sensor calibration constants, service intervals, and more. Some systems also offer user-programmable “hot keys” that allow the user to set and lock these functions, so much data is needed for equipment maintenance management alone, not to mention the real-time data for “check engine status indicator lights”. Being able to log and read error events in real time can significantly reduce equipment maintenance costs and reduce maintenance time.

Connect an electronic tag to each device through the I2C interface, and medical personnel can record and read error events in real time.

Improve data access and software upgrade capabilities for healthcare and patient monitoring equipment

Flexible and versatile dual-interface memory

According to memory requirements, these dual-interface memory chips can be divided into multiple logical storage areas, sharing the same I2C compatible bus and antenna. This solution not only expands the application scope of the memory, but also, the designer can also set a 32 security password in the memory or any logic area to establish the memory access authority mechanism.

Improve data access and software upgrade capabilities for healthcare and patient monitoring equipment

M24LR64 Dual Interface RFID EEPROM

The simplicity of design allows designers to flexibly apply this dual-interface electronic label. Now you may want to ask, what would happen if the device got system commands at the same time while reading and writing the electronic tag? Most engineers know that designing a simple system is usually about moving the complexity into the chip. For example, in ST’s M24LR64 dual-interface RFID EEPROM chip, there is a circuit that handles possible parallel communication to drive system activity from both the RF and I²C sides.

Design Criteria for Monitoring Equipment

The design standard of patient monitoring equipment is a complex sequence related to the monitoring location and monitoring content of patients. Evolving technologies and standards require close tracking of the aforementioned equipment manufacturing and maintenance data. Another difficult problem to deal with is counterfeit accessories, sensors, and other measurement devices worn on the patient’s body. For direct-plug accessories, designers can introduce a data encryption method into the system that can be read by the main processor, a solution that, of course, only applies to products such as smart sensors. For disposable accessories, designers may want to introduce a low-cost reader that can read and write electronic tags in the accessory, and then write a secure device code (Challenge Code) in the dual-interface RFID chip.

Example: Add a reader that verifies the identity of a one-time attachment.

When a new or certified device comes to market, it is not difficult to add a device code to the monitoring device. With the growing problem of counterfeit products, the market needs a reliable and inexpensive solution like the M24LR64 dual interface RFID EEPROM chip.

ISO Standards, Interoperability, Security

Current RFID technology uses the ISO/IEC 18000-3 Mode 1 air interface protocol (based on ISO 15693) at 13.56 MHz. The maximum read and write distance of this standard is 1 meter, depending on factors such as the size of the antenna. Due to its extremely low operating power and high security, this RFID standard has been widely used in various devices around the world, and recently we have seen some new Android phones installed with readers that are compatible with this standard.

in conclusion

The designer’s challenge hasn’t gotten any easier than it used to be, and fortunately, there are so many solutions available on the market today, some of which can be used in unrelated industries. When designers realize that a series of difficult problems can be easily solved with a low-cost, low-power, and easy-to-implement chip, such systems appear to have a broader application prospect in the medical market.

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