JP2001231770A - Connection part interface for input jig for inspection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting part interface for an input jig for inspection for simply, speedily and properly inspecting characteristics by enabling interchangeable connection through the use of a common connecting terminal in the case of inspecting the characteristics of a biological signal monitor device such as a pulse oximeter of a different circuit system. SOLUTION: The interface consists of an input jig 10 for inspection provided with a signal processing part 18, which is connected to a device to be inspected 20 consisting of the biological signal monitor device for carrying out current driving or voltage driving for inspecting the characteristic and inputs the driving current obtained by the device to be inspected to carry out required signal processing to this input signal. The interface is provided with a current/voltage conversion part 14 for inputting current obtained from the device to be inspected and converting it to voltage output to be sent to the signal processing part, and a voltage/current conversion part 16 for inputting voltage output obtained by processing the signal by the signal processing part and converting it to current or voltage to be sent to the device to be inspected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection input jig for periodically inspecting the characteristics of a biological signal monitoring device such as a pulse oximeter, and more particularly to a device for obtaining common measurement parameters. The present invention relates to a joint interface of a test input jig which can connect all of a plurality of biological signal monitoring devices having different circuit systems to a test input jig, thereby performing a characteristic test smoothly and quickly.

[0002]

2. Description of the Related Art Severely ill patients in ICU, CCU, and other emergency wards, or patients undergoing surgery or emergency transportation, who are likely to undergo sudden changes in their physiology, are required to be constantly monitored for electrocardiograms and respiratory breathing. It is necessary to monitor biological signals such as A biological signal monitoring device is used for this purpose, in particular, an electrocardiogram, blood pressure, arterial oxygen saturation (S).
pO2), body temperature, heart rate, respiratory rate and the like are important as measurement parameters that can be monitored in real time.

In a biological signal monitoring apparatus, a pulse oximeter capable of measuring, for example, SpO2 or the like as the measurement parameter is known, and this pulse oximeter easily and noninvasively measures the arterial oxygen saturation. Since it can be measured, it is important as a device that can grasp the ventilation state during anesthesia. In addition, since this pulse oximeter does not require calibration in principle, it satisfies the basic requirements as a device for monitoring a patient's condition. It is manufactured and sold by and is widely spread.

However, this type of pulse oximeter has a probe provided with a light-emitting portion composed of two light-emitting diodes having different emission wavelengths and a light-receiving portion composed of a photodiode, and the light-emitting diode coupled to the probe. Are alternately driven to receive the light transmitted through the living tissue positioned between the light emitting unit and the light receiving unit with the photodiode, and to convert the oxygen saturation based on the received transmitted light signal. And the measuring apparatus main body set to the above.

[0005] Therefore, pulse oximeters manufactured and sold by a larger number of manufacturers than before have the above-described basic measurement principle, and are different from each other in that they have two light emitting diodes. For the probe, as a connection method to connect to the measurement device main body,
The two light emitting diodes are broadly classified into a three-wire type and a two-wire type, and are merely different in circuit type.

[0006] Further, since this kind of pulse oximeter obtains extremely important measurement parameters as a device for measuring a biological signal of a patient, the characteristics of the light emitting diode having a sensor function of the biological signal due to deterioration are obtained. It is essential to detect changes quickly and properly. For this reason, it is necessary for the pulse oximeter to perform characteristic inspection periodically and relatively frequently. As means for performing such a characteristic test of the pulse oximeter, a drive current of the light emitting diode output from the pulse oximeter is detected,
This detection current is converted into a voltage, and then a necessary signal is added to the converted voltage, converted into a current again, and the current is input to a pulse oximeter. As a means for performing this, an input jig for inspection is known.

[0007]

However, the pulse oximeter inspection jig having the above-mentioned structure is not capable of supplying current to a pulse oximeter having a different circuit system if the light emitting diode wiring system is different. Since the direction, that is, the polarity, of the current flowing through each line is different, a common connection terminal cannot be provided when the pulse oximeter is connected to the inspection input jig. For this reason, conventionally, a dedicated connection terminal for connecting a pulse oximeter suitable for each circuit system is separately provided, or an inspection input jig provided with a dedicated connection terminal is separately provided. .

As described above, in the conventional input jig for inspection, a biological signal monitoring device such as a pulse oximeter having a different circuit system is connected to a common connection terminal, so that it is simple, quick and has appropriate characteristics. There was a disadvantage that the inspection could not be performed. In addition, even if the input jig for inspection is shared, it is necessary to add connection terminals so as to be compatible with each circuit system and to provide internal conversion circuits that are compatible with each circuit system. And the manufacturing cost also increases.

The inventor of the present invention has conducted extensive research and trial manufacture, and as a result, connected to a device to be inspected, which is a biological signal monitoring device that performs current driving or voltage driving, for performing a characteristic test, In a test input jig having a signal processing unit for inputting a drive current obtained from an inspection device and performing a required signal processing on this input signal, the current obtained from the device under test is input and converted into a voltage output. A current / voltage converter for transmitting the signal to the signal processing unit; and a voltage / current converter for inputting a voltage output obtained by performing signal processing in the signal processing unit and converting the voltage output to a current or a voltage for transmission to the device under test. Equipped with a junction interface provided with a current conversion unit, making compatible connections between devices to be inspected with different circuit systems easy and quick and suitable for characteristic inspection Have found that it is possible to carry out.

Accordingly, an object of the present invention is to make compatible connection possible by using a common connection terminal when performing a characteristic test of a biological signal monitoring device such as a pulse oximeter having a different circuit system, thereby making it simple and quick. It is another object of the present invention to provide an interface for an input jig for inspection so that a characteristic inspection can be properly performed.

[0011]

In order to achieve the above-mentioned object, a joint interface of an inspection input jig according to the present invention is applicable to a device to be inspected comprising a biological signal monitoring device which performs current driving or voltage driving. A test input jig connected to perform a characteristic test and having a signal processing unit for inputting a drive current obtained from the device under test and performing required signal processing on the input signal; A current / voltage converter for inputting the obtained current, converting it into a voltage output and sending it to a signal processing unit, and inputting a voltage output obtained by signal processing in the signal processing unit and sending it to the device under test And a voltage / current converter for converting the current or voltage into a current or a voltage.

In this case, the current / voltage conversion section includes a first
And a second differential amplifier, and a three-wire circuit type device under test and a two-wire circuit type are connected to the input terminals of the respective differential amplifiers via resistors and diodes, respectively. It is possible to provide a connection terminal for making a connection compatible with the device under test, and obtain a required voltage output from each of the differential amplifiers.

Further, the voltage / current converter has an analog photocoupler, and has a connection terminal for outputting a current output obtained from a photodiode of the analog photocoupler directly to the device under test as a current or a voltage. The configuration provided may be employed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a joint interface of a test input jig according to the present invention will be described in detail with reference to the accompanying drawings.

[0015]

Embodiment 1 FIGS. 1 and 2 show an embodiment of a joint interface of a test input jig using a biological signal monitoring device according to the present invention as a device to be inspected. FIG. 2 is a schematic block circuit diagram of a junction interface of a test input jig configured as a current output and current input system.

That is, in FIG. 1, reference numeral 10 indicates an input jig for inspection, and reference numeral 20 indicates a device to be inspected comprising a biological signal monitoring device such as a pulse oximeter. The inspection input jig 10 includes a junction interface 12 for connecting to the device under test 20 and a signal processing unit 18. The junction interface 12 further includes a current / voltage conversion unit 14 for inputting a current. And a voltage / current converter 16 for outputting a current.

Therefore, in the present embodiment, as shown in FIG.
A common line LED-CO for connecting to the device under test 20 with respect to the current / voltage converter 14 for inputting current from 0
MMON connection terminal 30, first drive line LED-DRV1 connection terminal 32, second drive line LED-DRV2 connection terminal 34, third drive line LED-DRV3 connection terminal 36, and fourth drive line LED-DR
V4 connection terminals 38 are provided. Further, a current / voltage converter 14 which is formed by connecting a first differential amplifier AMP1 and a second differential amplifier AMP2 to these connection terminals via resistors R1, R2 and diodes D1, D2, respectively. Is arranged. The voltage output signals obtained from the first differential amplifier AMP1 and the second differential amplifier AMP2 are respectively output to a voltage output signal line 31,
The signal is inputted to the signal processing section 18 via the first input signal LED1-SENSE and the second input signal LED2-SENSE via the signal processor 35, respectively.

On the other hand, the voltage / current converter 16 for outputting the current of the junction interface 12 includes a signal processor 18.
Voltage input signal SIGNAL-OUT from the voltage input signal line 4
0 as the voltage / current converter 16 input through the third
Are provided with a differential amplifier AMP3 and an analog photocoupler APC. The analog photocoupler APC is
Light emitting diode LED1 and first photodiode PD
1 and a second photodiode PD2. The second photodiode PD2 is configured to obtain a current output between the connection terminal 42 of the cathode PD-CATHODE and the connection terminal 44 of the anode PD-ANODE for connecting to the device under test 20. . Reference numeral 41 denotes a ground-side connection line for the analog photocoupler APC.

In the present embodiment, however, the signal processing unit 18 transmits a predetermined Sp to the signal processing unit 18 in order to inspect, for example, a pulse oximeter as the device under test 20.
The O2 value is set, and it is configured to check whether the device under test 20 is normal based on whether or not the value matches the SpO2 value indicated by the device under test 20. In this case, the patient's tissue is not applied to the probe during the examination, and the measurement is not performed.

Therefore, as shown in FIG. 3, for example, as shown in FIG.
35, the first differential amplifier AMP1
And a first input signal LED1-SENSE and a second input signal LED2-SEN comprising a voltage output signal of the second differential amplifier AMP2.
SE (see FIG. 2) is configured to be input from input terminals 50 and 51. The signal processing unit 18 includes an external SpO2 value setting unit 52 and the input signal LE.
LED1-SENSE for modulating the input signals LED1-SENSE and LED2-SENSE by setting the amplitude amplification rate and AM modulation rate (LED1-SENSE coefficient, LED2-SENSE coefficient) for D1-SENSE and LED2-SENSE, respectively Coefficient / LED2-SENSE coefficient setting unit 5
4 and the modulated signal are added by the adder 55, and the voltage input signal line 4 is connected to the junction interface 12.
In the signal processing unit 18, the output terminal 56 for obtaining a voltage input signal SIGNAL-OUT (see FIG. 2) for inputting via the 0 and the ground side connection line 41 (see FIG. 2) of the joint interface 12 are connected. And a ground terminal 57 that is grounded (GND).

In the signal processing unit 18 configured as described above, the externally input S
pO2 value and Sp calculated and displayed by the device under test 20
It is checked whether or not the O2 value matches the O2 value.
Can be checked for normality.

As described above, according to the junction interface 12 of the inspection input jig in the first embodiment, each connection terminal 3 provided in the current / voltage converter 14 for inputting a current is provided.
By appropriately and selectively connecting 0 to 38 to the current output terminal of the device under test 20, it is possible to transmit an appropriate voltage output signal to the signal processing unit 18. Then, the voltage input signal SIGNAL obtained by the signal processing unit 18
-OUT is connected to the device under test 2 via the voltage / current converter 16.
Connection terminal 42 of cathode PD-CATHODE for connection to 0 and anode
An appropriate current output can be output between the connection terminal 44 of the PD-ANODE.

[0023]

Embodiment 2 FIGS. 4 and 5 show another embodiment of a joint interface of a test input jig using a biological signal monitoring device according to the present invention as a device to be inspected. On the other hand, a schematic block circuit diagram of a junction interface of a test input jig configured as a current output and voltage input system is shown.

That is, in FIG. 4, the overall configuration is substantially the same as the configuration of the first embodiment shown in FIG. 1 described above. Therefore, the same components are denoted by the same reference numerals and detailed description thereof will be omitted. Detailed description is omitted. However, this embodiment is different from the first embodiment in that a voltage / current converter 17 for outputting a voltage is provided in the junction interface 12 in place of the voltage / current converter 16 for outputting a current in the first embodiment. Other configurations are exactly the same as those of the first embodiment.

Therefore, in this embodiment, as shown in FIG. 5, the basic structure of the junction interface 12 is substantially the same as that of the junction interface 12 of the first embodiment shown in FIG. In the voltage / current converter 17 for outputting a voltage, the resistor R3 is connected in parallel to the second photodiode PD2 of the analog photocoupler APC, and the connection terminal 43 of the cathode PD-CATHODE for connection with the device under test 20 is connected. And a connection between the anode PD-ANODE and the connection terminal 45 of the anode PD-ANODE.

According to the junction interface 12 of the inspection input jig according to the second embodiment configured as described above, the connection terminals 30 to 38 provided in the current / voltage conversion unit 14 for inputting current are appropriately selected. By appropriately connecting to the current output terminal of the device under test 20, an appropriate voltage output signal can be transmitted to the signal processing unit 18. Then, the voltage input signal SIGNAL obtained by the signal processing unit 18
-OUT is connected to the device under test 2 via the voltage / current converter 17.
Connection terminal 43 of cathode PD-CATHODE for connection with 0 and anode
It can be output as an appropriate voltage output between the connection terminal 45 of the PD-ANODE.

Next, the connection between the current / voltage converter 14 for inputting the current through the junction interface 12 of the inspection input jig of each of the above-described embodiments and the device to be inspected 20 having different circuit systems is performed. The connection state of each of the connection terminals 30 to 38 provided in the current / voltage conversion unit 14 will be described.

Contact with a device under test consisting of a three-wire current output
Continued Figure 6 shows a device under test 20A to obtain a 3-wire current output, a connection state between the connection terminals 30 to 38 provided in the current / voltage converter 14 at the junction interface 12 of the test input jig 10 Things. In this case, the device under test 2
The common line LED-COMMON connected to the first diode DA1 and the second diode DA2 provided at 0A is connected to the connection terminal 30 and to the connection terminal 36 for connecting the third drive line LED-DRV3. , The first drive line LED-DRV1 connected to the first diode DA1 is connected to the connection terminal 32, and the second drive line LED-DRV2 connected to the second diode DA2.
Is connected to the connection terminal 34. In this case, the connection terminal 38 for connecting the fourth drive line LED-DRV4 is a dummy terminal.

With this connection, when the first diode DA1 is driven, the first differential amplifier A
A voltage output based on the drive current is obtained from MP1, and when the second diode DA2 is driven, a voltage output based on the drive current is obtained from the second differential amplifier AMP2. Accordingly, the first device provided in the inspection target device 20A
The diode DA1 and the second diode DA2 are alternately driven, and the alternately obtained current outputs are appropriately sent to the current / voltage conversion unit 14 of the junction interface 12, and the input signal LED1- SENSE, LED2-SEN
An appropriate voltage output signal can be obtained for each SE.

[0030] Connection with a device to be inspected consisting of a two-wire current output
Continued 7 shows a device under test 20B to obtain a two-wire current output, a connection state between the connection terminals 30 to 38 provided in the current / voltage converter 14 at the junction interface 12 of the test input jig 10 Things. In this case, the device under test 2
A third drive line LED-DRV3 connected to one end of a pair of diodes DB1 and DB2 connected in anti-parallel provided at 0B is connected to a connection terminal 36 and a first drive line LED-DRV1 is connected. And the fourth drive line LED-DRV4 connected to the other end is connected to the connection terminal 38. In this case, the connection terminal 30 for connecting the common line LED-COMMON and the connection terminal 34 for connecting the second drive line LED-DRV2 are dummy terminals.

With this connection, when one diode DB1 is driven, a voltage output based on the driving current is obtained from the second differential amplifier AMP2,
When the other diode DB2 is driven, the first
, A voltage output based on the drive current is obtained. Therefore, even if the device under test 20B has a different circuit system from the device under test 20A, the diodes DB1 and DB2 are driven alternately in the same manner as described above, and the current outputs obtained alternately are respectively: The signals are properly transmitted to the current / voltage converter 14 of the junction interface 12 and input to the signal processor 18 by LED2-SENSE and LED1-SEN.
An appropriate voltage output signal can be obtained for each SE.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment. For example, as a device to be inspected, a pulse oximeter to which a current output and current input method can be applied. It can be widely applied not only to various biological signal monitoring devices such as meters, but also to various biological signal monitoring devices such as electrocardiogram monitors to which current output and voltage input methods can be applied. Various design changes can be made without departing from the spirit of the present invention.

[0033]

As is clear from the above-described embodiment, according to the joint interface of the input jig for inspection according to the present invention, the characteristics of the device to be inspected comprising the biological signal monitoring device which performs current driving or voltage driving can be improved. A test input jig having a signal processing unit connected to perform an inspection and inputting a drive current obtained from the device to be inspected and performing a required signal processing on the input signal, comprising: A current / voltage converter for inputting the obtained current, converting it to a voltage output and sending it to a signal processing unit, and inputting a voltage output obtained by signal processing in the signal processing unit and sending it to the device under test And a voltage / current conversion unit for converting the current or voltage into
When testing the characteristics of biological signal monitoring devices such as pulse oximeters with different circuit methods, use a common connection terminal to enable compatible connection, and perform simple, quick, and proper characteristic testing. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic block circuit diagram showing one embodiment of an inspection input jig provided with a joint interface for a device under inspection according to the present invention.

FIG. 2 is a main part circuit diagram showing a circuit configuration of a joint interface in the inspection input jig shown in FIG. 1;

FIG. 3 is a schematic block circuit diagram showing a configuration example of a signal processing unit in the inspection input jig shown in FIG.

FIG. 4 is a schematic block circuit diagram showing another embodiment of an inspection input jig provided with a joint interface for a device to be inspected according to the present invention.

5 is a main part circuit diagram showing a circuit configuration of a joint interface in the test input jig shown in FIG. 4;

FIG. 6 is a circuit diagram showing a connection method between a joint interface of a test input jig according to the present invention and a device to be tested having a three-wire current output.

FIG. 7 is a circuit diagram showing a connection method between a junction interface of a test input jig according to the present invention and a device to be tested having a two-wire current output.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Input jig for inspection 12 Junction interface 14 Current / voltage conversion part 16 Voltage / current conversion part (current output) 17 Voltage / current conversion part (voltage output) 18 Signal processing part 20, 20A, 20B Device under test 30 Common line LED-COMMON connection terminal 31 Voltage output signal line of first operation amplifier AMP1 32 Connection terminal of first drive line LED-DRV1 34 Connection terminal of second drive line LED-DRV2 35 Second operation amplifier AMP2 Voltage output signal line 36 Connection terminal of third drive line LED-DRV3 38 Connection terminal of fourth drive line LED-DRV4 40 Voltage input signal line from signal processing unit 41 Earth side connection line 42 Cathode PD-CATHODE ( (Current) connection terminal 43 (voltage) connection terminal of cathode PD-CATHODE 44 (current) connection terminal of anode PD-ANODE 45 (voltage) connection terminal of anode PD-ANODE 50, 51 input terminal 52 SpO2 value Unit setting unit 54 Input signal coefficient setting unit 55 Adder 56 Output terminal 57 Ground terminal AMP1 to AMP3 Differential amplifier R1 to R3 Resistance D1, D2 Diode APC Analog photocoupler LED1 Light emitting diode PD1, PD2 Photodiode DA1, DA2 Device under test 20A diodes DB1, DB2 Diodes of device under test 20B

Claims (3)

[Claims] An input signal is connected to a device to be inspected comprising a biological signal monitoring device that performs current driving or voltage driving for performing a characteristic test, and a driving current obtained from the device to be inspected is inputted to the device. A current / voltage converter for inputting a current obtained from the device under test, converting the current to a voltage output, and sending the voltage output to the signal processing unit. And a voltage / current converter for inputting a voltage output obtained by performing signal processing in the signal processing unit and converting the voltage output into a current or voltage for sending to the device under test. Input jig interface. 2. The current / voltage conversion section includes a first differential amplifier and a second differential amplifier, and receives an input terminal of each of the differential amplifiers via a resistor and a diode. Connection terminals for making compatible connections between the device under test of the wire circuit system and the device under test of the two-wire circuit system are provided, respectively, so as to obtain a required voltage output from each of the differential amplifiers. The interface of the input jig for inspection according to claim 1. 3. The voltage / current conversion unit includes an analog photocoupler, and has a connection terminal that outputs a current output obtained from a photodiode of the analog photocoupler directly to the device under test as a current or a voltage. 3. The interface of the input jig for inspection according to claim 1, wherein the interface is provided.