CN101536900B - Method and system for constructing modular medical instrument based on USB HUB - Google Patents

Abstract

The invention relates to a method and a system for constructing a modular medical instrument based on USB HUB. The method comprises the following steps: each functional circuit adopts modular design, independently adopts a microprocessor and has the functions of independent AD conversion and USB communication control; each functional module is connected with a USB HUB module which has an electrical safety isolation function through a USB bus; and the USB HUB module is connected with a central console (PC) or server hardware through the USB bus, and connected with a special software platform based on the PC to form a complete medical instrument system. The method can realize high reliability and easy maintenance of the medical instrument, and the flexible expandability of the functions of the medical instrument, change the mode that the functions of the medical instrument are set by manufactures and can not be modified by a user, lead the user to be capable of randomly combining (increase or decrease) the functional modules according to specific detection requirements, and realize the personalized physiological parameter detection function and the function expansion of the medical instrument by USB topological structure.

Description

Method and system for constructing modular medical instrument based on USB HUB

technical field

The invention relates to a method for constructing a medical instrument and a medical system constructed according to the method, in particular to a method and system for constructing a modular medical instrument based on a USB HUB, belonging to the field of medical electronic instruments.

Background technique

Universal Serial Bus (USB) has become the most widely used communication connection standard due to its advantages of low price, high speed, flexible scalability and high integration design. In addition to the common PC-side applications, the Universal Serial Bus (USB) has been used in more and more fields as a data communication interface. At present, the USB interface data communication method has gradually entered the field of medical equipment.

Chinese patent 02289498.5, title: "USB-based multi-channel AD collector", discloses an improvement to the original AD data collector based on the ISA interface. The collector mainly includes a USB interface circuit connected to a PC, a single-chip microcomputer The three parts of the unit circuit and the AD conversion circuit and the corresponding device drivers that can run under Windows98 and Windows2000, the three parts of the circuit of the collector are all installed on a data acquisition card that can be connected to the USB bus of a PC. Compared with the existing multi-channel AD collector based on ISA interface, it has the characteristics of convenient and fast use, strong adaptability and easy realization. However, the utility model still has the disadvantages of needing an external physiological signal detection circuit and not adopting electrical safety isolation measures. The Chinese patent application number is: 200510013384.1, and the name is: "Multiple Physiological Parameter Detection System Based on USB", which discloses a physiological parameter detection system based on USB bus for data transmission and communication control. The patent application uses signal and power Isolation technology ensures the safety of use, and can realize the detection of ECG, blood pressure, blood oxygen, respiration, and body temperature signals; its disadvantage is that the acquisition and control of all physiological signals depends on a single microprocessor. Failure, the detection of all parameters will not be carried out normally, the reliability is poor, and it is not easy to maintain, and the system cannot realize the expansion of detection parameters and realize the individualized physiological parameter detection function according to specific detection requirements.

The functions of existing medical instruments are set by the manufacturer and cannot be modified by users, and the functions of medical instruments cannot be expanded according to specific needs. Detection instruments can only detect fixed types of physiological parameters, and diagnostic instruments can only perform fixed types of image diagnosis. Therapeutic instruments can only perform fixed types of treatment. Clinically, many different instruments are often used at the same time, which brings mutual interference between instruments, increases the complexity of power management, and increases the cost of purchasing medical equipment for hospitals. costs, while increasing the medical burden of patients.

The built-in USB port on the host PC has a limited number of extended USB ports (generally 4). Peripherals such as keyboards and mice tend to be designed with USB interfaces. When the host PC has too many external functional devices, Facing the lack of USB interface, it is necessary to use USB HUB to expand.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for constructing a modular medical instrument based on USB HUB; at the same time, it provides a medical system constructed based on the above-mentioned method, and the present invention can realize the flexible function of the medical instrument Expansion, and then realize safe and individualized physiological parameter detection, the system is easy to maintain and has high reliability.

The object of the present invention is achieved like this: a kind of modularized medical instrument construction method based on USB HUB, at first adopts modular design to each functional circuit of medical instrument to become independent functional module, and each functional module independently adopts a microprocessor, has Independent AD conversion and USB communication control functions; then the above-mentioned functional modules for collecting human body signals are connected in parallel with the USB HUB module through the USB bus, and the USB HUB module realizes electrical safety isolation between the human body and the computer and inputs The signal is transmitted to the central console server; finally, the central console server processes the above signal to obtain the physiological parameter index of the subject, and the index is output through the output device, thereby completing the construction of the medical instrument.

The functional module is composed of a basic physiological parameter signal acquisition module and other physiological parameter signal acquisition modules, and the basic physiological parameter signal acquisition module is composed of a heart sound signal acquisition module, an electrocardiographic signal acquisition module, a noninvasive blood pressure signal acquisition module and a blood oxygen signal acquisition module , used to collect basic physiological parameters heart sound, ECG, non-invasive blood pressure and blood oxygen signals, other physiological parameter signal acquisition modules include EEG signal acquisition module, myoelectric signal acquisition module, carotid pulse wave signal acquisition module, respiratory signal acquisition module And the body temperature signal acquisition module, the basic physiological parameter signal acquisition module and other physiological parameter signal acquisition modules can be combined arbitrarily according to the detection requirements.

The USB HUB module can adopt the USB topology to realize function expansion, for example, a diagnosis HUB and a treatment HUB can be expanded.

A medical system constructed based on the above method, which includes a modular multi-physiological parameter signal acquisition circuit, a USBHUB module, a power supply module, a central console server and an output device, and the multi-physiological parameter signal acquisition circuit includes a basic physiological parameter signal Acquisition module, basic physiological parameter signal acquisition module is composed of four functional modules: heart sound signal acquisition module, ECG signal acquisition module, non-invasive blood pressure signal acquisition module and blood oxygen signal acquisition module, used to collect basic physiological parameters heart sound, ECG, non-invasive blood pressure and blood oxygen, the functional modules under the multi-physiological parameter signal acquisition circuit are connected in parallel and have independent A/D conversion and USB communication control functions; the above-mentioned signals collected by the multi-physiological parameter signal acquisition circuit are input into the USB HUB module through the USB bus, The USB HUB module realizes the electrical safety isolation between the human body and the computer and transmits the input signal to the central console server. The central console server processes the above signal to obtain the physiological parameter index of the subject. The index is output through the device output.

The USB HUB module includes a DC-DC step-down circuit, an electrical safety isolation circuit, a USB HUB controller, a USB HUB power controller and a USB bus interface; the electrical safety isolation circuit uses a DC-DC isolation power supply module to realize electrical isolation of the power supply, Use radio frequency modulation isolation devices or photoelectric coupling devices to realize electrical isolation of signals; the USB HUB controller is a seven-port or four-port USB HUB controller.

Further, the multi-physiological parameter signal acquisition circuit also includes other physiological parameter signal acquisition modules, the other physiological parameter signal acquisition modules are EEG signal acquisition module, myoelectric signal acquisition module, carotid pulse wave signal acquisition module, respiratory Any combination of signal acquisition module and body temperature signal acquisition module, other physiological parameter signal acquisition modules and basic physiological parameter signal acquisition modules are connected in parallel and have independent A/D conversion and USB communication control functions.

The USB HUB module adopts USB topology to expand the diagnosis HUB and treatment HUB; the diagnosis HUB is connected to the ultrasonic function module, the blood viscosity test function module and the endoscope function module through the USB interface; the treatment HUB is connected to the defibrillator through the USB interface Functional modules, high-frequency electric knife functional modules, insomnia therapeutic apparatus functional modules, rehabilitation therapeutic apparatus functional modules and infusion pump functional modules.

The power module provides power supply for the whole system. Among them, it provides 15V and 1A DC power supply for the USB HUB module, and provides basic working power supply ±5V and ±3.3V for each functional module.

Compared with the prior art, the present invention has the following beneficial effects:

1. Since each functional circuit of the medical instrument independently adopts a microprocessor, it has independent AD conversion and USB communication control functions, and can be independently connected to the USB HUB interface to realize independent signal acquisition, AD conversion, and transmission functions, and can be customized according to specific conditions. Clinical needs any combination and collocation to realize individualized physiological parameter detection.

2. High reliability and easy maintenance of medical instruments can be realized. The invention provides a single, easy-to-use standard USB interface connection type for all functional modules, simplifies the design of the communication interface, and simplifies the task of the user when judging which plug corresponds to which slot, and realizes a single data Universal interface; easy to maintain, each peripheral function module is independent of each other, if any function circuit fails, you can directly replace the module or perform more targeted maintenance.

3. Realize the flexible scalability of medical instrument functions, change the mode that the medical instrument functions are set by the manufacturer and cannot be modified by the user, and the user can arbitrarily combine (increase or decrease) the peripheral function modules according to the specific detection requirements to realize individualized physiological parameter detection Function and through the USB topology, the function expansion of medical instruments can be realized, and it can be extended and connected to 127 peripheral function devices at most.

4. Support plug-and-play and hot-swapping of each functional module, and can safely plug in and disconnect each peripheral functional module without turning off the system power supply. The computer system automatically detects the plug-in and unplug of each module, and dynamically Load the driver.

5. With high safety, the USB HUB module adopts signal and power isolation technology to realize 2500V electrical safety isolation function to ensure the absolute safety of human body and equipment.

6. Provide four different data transmission types to meet the data transmission requirements of various functional modules.

Description of drawings

Figure 1 - a schematic structure diagram of a modular medical instrument system based on USB HUB (without extended function HUB);

Fig. 2 - a block diagram of a modular medical instrument system based on USB HUB (unextended function HUB);

Figure 3 - Schematic diagram of the seven-port USB HUB module;

Figure 4 - a USB HUB topology diagram of a modular medical instrument system based on USB HUB;

Figure 5 - a functional block diagram of a modular medical instrument system (with extended function HUB) based on USB HUB.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

A method for constructing a modular medical instrument based on a USB HUB. The specific implementation is as follows: each functional circuit of the medical instrument adopts a modular design; each functional module is connected to a USB HUB module with an electrical safety isolation function through a USB bus; The bus realizes the connection with the central console server (including a dedicated software platform based on the central console server) to form a complete medical instrument system;

Among them, each functional circuit of the medical instrument independently adopts a microprocessor, which has independent AD conversion and USB communication control functions, and can be independently connected to the USB HUB interface to realize independent signal acquisition, AD conversion, and transmission functions, and can be customized according to specific conditions. Clinical needs any combination and collocation to realize individualized physiological parameter detection. The A/D conversion and USB communication control functions are realized by a microprocessor integrating ADC and USB controller inside, or by an independent A/D conversion chip, microcontroller, and USB interface chip. This method can also adopt the USB topology structure, and realize the function expansion of the medical instrument through the USB HUB module, such as extending the diagnosis HUB and the treatment HUB.

Embodiment 1 of the modularized medical instrument system based on USB HUB of the present invention:

As shown in Figure 1, the system includes a modular multi-physiological parameter signal acquisition circuit, a USB HUB module, a power supply module, a central console server (including a dedicated software platform based on the central console server) and output devices. Among them, the modular multi-physiological parameter signal acquisition circuit includes a heart sound signal acquisition module, an ECG signal acquisition module, a non-invasive blood pressure signal acquisition module, a blood oxygen signal acquisition module, an EEG signal acquisition module, an EMG signal acquisition module, a carotid pulse Wave signal acquisition module, respiratory signal acquisition module and body temperature signal acquisition module. Heart sound signal acquisition module, ECG signal acquisition module, non-invasive blood pressure signal acquisition module and blood oxygen signal acquisition module four functional modules constitute the basic physiological parameter signal acquisition module, which is used for basic physiological parameters heart sound, ECG, non-invasive blood pressure, blood oxygen signal Acquisition, the other five modules can be arbitrarily combined with the basic physiological parameter signal acquisition module through the USB HUB according to specific detection requirements, and a total of 32 differentiated physiological parameter signal detection combinations can be provided.

As shown in Figure 2, the heart sound signal acquisition module is used to detect, amplify, AD convert, and output heart sound signals; including active heart sound sensors, heart sound frequency division circuits, signal conditioning circuits, and central processing circuits (including AD conversion and USB communication circuits) , USB interface; wherein, the heart sound frequency division circuit is specifically: low frequency circuit (5-60Hz), intermediate frequency circuit (60-120Hz), high frequency circuit (120-1500Hz);

The ECG signal acquisition module is used for detection, amplification, AD conversion, and output of ECG signals; including body surface ECG electrodes and ECG lead wires, pre-stage safety protection circuits, signal conditioning circuits, central processing circuits (including AD conversion and USB communication circuit), USB interface;

The non-invasive blood pressure signal acquisition module circuit is used for detection, amplification, AD conversion, and output of non-invasive blood pressure signals; including blood pressure cuff, cuff pressure and pulse signal detection circuit, air pump valve control circuit, level conditioning circuit, central processing circuit (including AD conversion and USB communication circuit), USB interface;

The blood oxygen signal acquisition module is used for detection, amplification, AD conversion, and output of blood oxygen signals; including blood oxygen sensors, signal conditioning circuits, central processing circuits (including AD conversion and USB communication circuits), and USB interfaces;

The EEG signal acquisition module is used to detect, amplify, AD convert, and output EEG signals; including EEG surface electrodes, pre-stage safety protection circuits, signal conditioning circuits, central processing circuits (including AD conversion and USB communication circuits), USB interface;

The myoelectric signal acquisition module is used to detect, amplify, AD convert, and output myoelectric signals; including surface electrodes, pre-stage safety protection circuits, signal conditioning circuits, central processing circuits (including AD conversion and USB communication circuits), and USB interfaces;

The carotid pulse wave signal acquisition module is used for detecting, amplifying, AD converting, and outputting the carotid pulse wave signal; including a carotid pulse sensor, a signal conditioning circuit, a central processing circuit (including AD conversion and USB communication circuit), and a USB interface;

The respiratory signal acquisition module is used to detect, amplify, AD convert, and output the respiratory signal; it includes a respiratory sensor, a signal conditioning circuit, a central processing circuit (including AD conversion and USB communication circuit), and a USB interface;

The body temperature signal acquisition module is used for detection, amplification, AD conversion, and output of ECG signals; including temperature sensors, signal conditioning circuits, central processing circuits (including AD conversion and USB communication circuits), and USB interfaces;

The A/D conversion and USB communication control circuits in the above-mentioned acquisition modules can be implemented by a microprocessor (such as the C8051F32X/34X series products of Silicon Laboratories of the United States) that integrates ADC and USB controller in a single chip, or by an independent A/D D conversion chips, microcontrollers, and USB interface chips are implemented (such as Maxim's MAX1246, NXP Semiconductors' LPC932A1, DIUSBD12); other circuits are implemented using existing commonly used design methods;

Among them, the USB HUB module includes: DC-DC step-down circuit, electrical safety isolation circuit, USB HUB controller, USB HUB power controller, USB bus interface; electrical safety isolation circuit has 2500V electrical safety isolation function, adopts DC-DC The isolated power supply module realizes the electrical isolation of the power supply (such as G0505D-2W of Jinshengyang Company), and uses the radio frequency modulation isolation device (such as the SI844X series digital isolation device of Silicon Laboratories in the United States), or the photocoupler device (such as TLP521-2GB) to realize the electrical isolation of the signal ; The USB HUB controller is realized by TUSB2077A and TUSB2046B of American TI Company; the USB HUB power controller is realized by the TPS207X series of American TI Company; other circuits are realized by existing common design methods; Figure 3 shows a seven-port USB HUB module structure;

Among them, the power module can be implemented in the following two ways:

1. The power adapter directly supplies power, including 220V AC adapter (output 15V, 1A DC power supply), DC-DC step-down circuit (output +3.3V and +5.0V DC power supply, using a step-down chip such as LM2575), voltage reverse To the circuit (to obtain -3.3V, -5.0V power supply, the reverse charge pump adopted is such as Maxim's MAX889), DC-DC isolated power supply module;

2. Power adapter and Li battery power supply, modular multi-physiological parameter signal acquisition circuit directly obtains power from USB bus, including 220V AC adapter (output 15V, 1A DC power supply), Li battery charging circuit (directly adopts PC USB port power supply) For Li battery, the charger adopts Maxim's Max1811), DC-DC step-up circuit and DC-DC step-down circuit (to obtain +3.3V and +5.0V, such as Maxim's Max1797 and Max1837), voltage inversion circuit (Adopted inverse charge pump such as Maxim's MAX889);

A dedicated software platform based on the central console server: including computer operating systems, drivers, signal analysis and processing algorithms, user interfaces, and databases; through the USB driver, each USB HUB and the characteristic information stored in each module, it realizes the control of each module. identification, establish a communication connection with the hardware system, and complete the recording, preprocessing, data analysis, display, and data storage of various physiological signals.

Among them, the signal recording, preprocessing, and display are realized by the graphical programming system design platform Labview8.20 programming, and the signal software recording, preprocessing, graphic display or data display software of each physiological parameter adopts a modular design, and each software module is relatively independent , the software module can be loaded or unloaded according to the modular signal acquisition circuit; the database storage adopts MySQL Server 5.0.67 database, which is programmed by the graphical programming system design platform Labview8.20; the data analysis and processing algorithm adopts Matlab7.0 programming, And through the seamless embedding of the labview MathScript node into the software system, the recorded data is processed, the feature points of the relevant waveforms are extracted, and the relevant indicators are calculated.

The output device, such as a printer, realizes the printout of the test report, and the speaker outputs the audio signal.

Embodiment 2 of a modular medical instrument system based on USB HUB of the present invention:

As shown in Figure 4, the USB topology is adopted, and the function expansion of the medical instrument is realized through the USB HUB module, and the diagnosis HUB and the treatment HUB are expanded. The specific expansion can be seen from Figure 4: USB HUB module 1 has seven USB interfaces, four of which are connected to the basic physiological parameter signal acquisition module (also can be connected to the basic physiological parameter signal acquisition module and other physiological parameter signal acquisition modules, a total of Any four of the nine modules), and the other three USB ports are respectively connected to the extended USB HUB module 2, diagnosis HUB and treatment HUB. The other five physiological parameter signal acquisition modules are connected to the expanded USB HUB module 2 through the USB interface.

As shown in Figure 5, a modular medical instrument system based on USB HUB with extended functions, the modular multi-physiological parameter signal acquisition circuit is exactly the same as that of Embodiment 1, and the diagnosis HUB and the treatment HUB are connected to the USB HUB module; wherein , the diagnosis HUB is connected to the ultrasonic function module, blood viscosity test function module and endoscope function module through the USB interface; the treatment HUB is connected to the defibrillator function module, high-frequency electric knife function module, insomnia treatment instrument function module, rehabilitation treatment through the USB interface Instrument function module and infusion pump function module.

Among them, the diagnosis HUB and the treatment HUB adopt uninterruptible power supply USP, DC-DC step-down circuit, DC-DC step-up circuit, magnetic isolation device, and DC-DC isolation power module to provide power supply according to the power requirements of specific modules.

The present invention is not limited to the embodiments exemplified in this specification. Various changes or modifications made by those skilled in the art using known techniques without departing from the present invention all fall within the protection scope of the present invention.

Claims (4)

1. modular medical instrument construction method based on USB HUB, it is characterized in that: at first, adopt modularized design to become independently functional module to each functional circuit of Medical Instruments, each functional module independently adopts a microprocessor, has independently A/D conversion and usb communication control function;

Then, each functional module is connected with USB HUB module by usb bus with parallel way, the electrical safety between USB HUB module realization human body and the computer is isolated and the signal of importing is transferred to the central control board server;

At last, by the central control board server above-mentioned signal is handled the physiological parameter index that obtains the experimenter, described physiological parameter index is exported by outut device, finishes the structure of Medical Instruments thus;

Described USB HUB module adopts the USB topological structure, realizes the function expansion, expands diagnosis HUB and treatment HUB;

Described USB HUB module comprises DC-DC reduction voltage circuit, electrical safety buffer circuit, USB HUB controller, USB HUB power-supply controller of electric and usb bus interface; The DC-DC insulating power supply module that adopts the electrical safety buffer circuit realizes the electrical isolation of power supply, adopts rf modulations isolating device or photoelectric coupled device to realize the electrical isolation of signal; USB HUB controller is the USB HUB controller of seven mouthfuls or four-hole.

2. the modular medical instrument construction method based on USB HUB according to claim 1 is characterized in that: described functional module is made up of basic physiological parameter signal acquisition module and other physiological parameter signals acquisition module; Described basic physiological parameter signal acquisition module is made up of cardiechema signals acquisition module, ecg signal acquiring module, non-invasive blood pressure signal acquisition module and blood oxygen signal acquisition module, is used to gather basic physiological parameter hear sounds, electrocardio, non-invasive blood pressure and blood oxygen signal; Described other physiological parameter signals acquisition module is made of fight ripple signal acquisition module, breath signal acquisition module and body temperature signal acquisition module of eeg signal acquisition module, electromyographic signal collection module, carotid artery, but each functional module under each functional module under the described basic physiological parameter signal acquisition module and described other physiological parameter signals acquisition module is according to detection demand combination in any.

3. one kind based on the method for claim 1 and the medical system that makes up, it is characterized in that: it comprises modular multi-physiological-parameter signal acquisition circuit, USB HUB module, central control board server and outut device, described multi-physiological-parameter signal acquisition circuit comprises basic physiological parameter signal acquisition module, basic physiological parameter signal acquisition module is by the cardiechema signals acquisition module, the ecg signal acquiring module, non-invasive blood pressure signal acquisition module and blood oxygen signal acquisition module four functional modules are formed, be used to gather basic physiological parameter hear sounds, electrocardio, non-invasive blood pressure and blood oxygen, each functional module under the multi-physiological-parameter signal acquisition circuit is parallel with one another and have independently A/D conversion and a usb communication control function;

The above-mentioned signal that the multi-physiological-parameter signal acquisition circuit collects is by usb bus input USB HUB module, electrical safety between USBHUB module realization human body and the computer is isolated and the signal of importing is transferred to the central control board server, by the central control board server thereby above-mentioned signal is handled the physiological parameter index that obtains the experimenter, described physiological parameter index is exported by outut device;

Described USB HUB module adopts the USB topological structure, expands diagnosis HUB and treatment HUB; Diagnosis HUB connects ultrasound functions module, blood viscosity test function module and endoscope's functional module by USB interface; Treatment HUB connects defibrillator functionality module, high frequency electric knife functional module, apparatus for curing insomnia functional module, therapeutic instrument for rehabilitation functional module and infusion pump functional module by USB interface;

Described USB HUB module comprises electrical safety buffer circuit, USB HUB controller, USB HUB power-supply controller of electric and usb bus interface; The DC-DC insulating power supply module that adopts the electrical safety buffer circuit realizes the electrical isolation of power supply, adopts rf modulations isolating device or photoelectric coupled device to realize the electrical isolation of signal; USB HUB controller is the USB HUB controller of seven mouthfuls or four-hole.

4. medical system according to claim 3, it is characterized in that: described multi-physiological-parameter signal acquisition circuit also comprises other physiological parameter signals acquisition module, described other physiological parameter signals acquisition module is the eeg signal acquisition module, the electromyographic signal collection module, the carotid artery ripple signal acquisition module of fighting, the combination in any of breath signal acquisition module and body temperature signal acquisition module, parallel with one another and each functional module of each functional module under each functional module under described other physiological parameter signals acquisition module and the described basic physiological parameter signal acquisition module have independently A/D conversion and usb communication control function;

Wherein, A/D conversion and usb communication control function, by the microprocessor of integrated A/D converter in inside and USB controller, perhaps adopting independently, the mode of A/D conversion chip, microcontroller, USB interface chip realizes.

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