JP2003210438A - Adapter for oximeter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain a function similar to an oximeter having a noise removal function using an oximeter having no noise removal function. <P>SOLUTION: This adapter for the oximeter is provided with a first processing part 11 receiving a signal from a sensor part 3 and outputting an IR signal and SpO<SB>2</SB>signal and a second processing part 12 receiving the SpO<SB>2</SB>signal and the IR signal, outputting the IR signal and an R signal, and feeding them to an oximeter body 2. <P>COPYRIGHT: (C)2003,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates to a sensor unit and an oxy
Oximeter adapter inserted between the meter body
About putter. [0002] 2. Description of the Related Art A technique for measuring oxygen saturation in arteries of the human body.
Lusoximeter has been shown in Fig. 12 (a).
Attach the sensor to the part to be measured, for example, the fingertip
The sensor probe to an oximeter monitor (Oki
(Simulator body), and the necessary display signal is
-The signal was processed and output as a display. This oki
Symmeters have used oximetry medical systems in the past.
With the establishment of the system, it has been introduced as necessary equipment.
And, as an indication, the oxygen saturation SpO₂It is this
However, in the auxiliary display signal, the pulse in the biological information
The observation of the waveform has turned out to be important. FIG. 12B shows a conventional pulse oximeter.
FIG. Conventional pulse oximeter
Connect the sensor and the oximeter body to each other.
Connected to a sensor probe. The sensor unit irradiates a fingertip with infrared light.
LED for infrared light and red light for irradiating fingertip with red light
LED and infrared and red light transmitted through the fingertip
And the calibration resistor
Have. Here, the calibration resistor is an acid
When calculating elementary saturation, it depends on the wavelength of infrared light and red light.
This is for setting the existing coefficient. In addition, carry
The brazing resistor must always be in the sensor
However, it may be provided in the sensor probe. [0005] The oximeter bodies have opposite polarities.
LED for red light and LED for red light connected in parallel
LED drive circuit that supplies a drive signal to the
An infrared signal (hereinafter referred to as IR signal)
Signal), a red light signal (hereinafter, referred to as an R signal)
Signal processing unit that performs processing such as extraction of
Output signal and calibration resistor
The oxygen saturation (SpO)₂Value)
SpO₂Arithmetic processing unit, SpO₂Display that displays the value
Part. In order to display the pulse waveform,
Converts the extracted IR signal or R signal to SpO₂Arithmetic processing
After making the signal size appropriate through the
ing. In the pulse oximeter having the above configuration,
As shown in (a) of FIG.
For infrared light by alternately applying to (+) side and minus (-) side
By driving the LED and the red light LED alternately,
As shown in FIG. 13B, the infrared light and the red light
Generate alternately. Then, the light transmitted through the fingertip is
Light is received by the LED and a signal synchronized with each LED is obtained.
13 (c)). However, macro-wise,
The pulse waveform of the living body can be obtained by looking at the envelope of the pulse shown in FIG.
Middle (d)). To summarize the above, a pulse wave in a living body
13 (d) in FIG.
An R signal and an R signal can be obtained. Also these
Let IR and R be the envelopes of IR = dIR (change component) + IRDC (DC component) R = dR (change component) + RDC (DC component) Can be represented by Then, (dIR / IRDC) / (dR /
RDC) and the wavelengths of infrared light and red light.₂
The value can be calculated. LED drive signal in FIG.
It is given as shown in (e) and is shown in (f) in FIG.
Similarly, when generating infrared light and red light,
SpO₂The value can be calculated. [0009] SUMMARY OF THE INVENTION The above conventional pulse oki
In a simeter, the body of the part where the sensor is attached
Noise caused by motion, etc.₂Is incorrect
There is the disadvantage of having a difference. That is, no motion
In the state, the IR signal and the R signal repeat a certain waveform in proportion.
15 (see FIG. 14).
As shown in the figure, the IR signal and the R signal are not proportional, and (dIR
/ IRDC) / (dR / RDC) varies, so S
pO₂The values fluctuate. Noise is body movement
In addition to the above, factors of the measurement site itself, such as static
Area where the pulse and artery overlap, skin color at that area, etc.
Some are due. Regarding the elimination of this noise, the idea is
There are several, for example, SpO₂Like the time change of the value of
There is something that detects noise from the child
Can be introduced into the oximeter monitor. Place
But most of the places you already need are noise reduction
The pulse oximeter shown in FIG.
That have a new noise reduction function.
Replacing with a ximeter requires man-hours and costs for replacement
This is a problem in terms of use. The present invention has been made in view of the above problems.
Oxygen without noise reduction function
Oximeter with noise removal function using a meter
Oxymeter that can achieve the same function as
It is intended to provide an adapter for use. [0011] Means for Solving the Problems The oximeter of the present invention
Adapter for the sensor and the oximeter body
It is interposed between and provided in the sensor unit
Signals from the light receiving means and the calibration resistor
Receive and output oxygen saturation signal and infrared light signal
First processing means, and a red light signal based on the infrared light signal
Generating the infrared light signal and the generated red light signal
Processing means for outputting a signal and a calibration resistor
Is included. Note that the calibration resistor is
SpO₂Is given as an argument when calculating
It doesn't have to be resistance. Get signal giving arguments
Capacitors and PROMs
Can be used. [0013] The oximeter adapter according to the present invention
Is output from the light receiving means of the sensor unit in the first processing unit.
SpO from the input infrared light signal and red light signal₂Calculate the value
Put out. The first processing unit calculates the calculated SpO₂Value and infrared light waveform
The signal is output as a digital value to the second processing unit. Second place
Is the input SpO₂Value and the infrared light waveform signal.
To generate an analog red light waveform signal and
The external light waveform signal is reproduced as an analog waveform. Accordingly
The oximeter body has an infrared waveform signal and a red
A color light waveform signal is input as an analog waveform,
The main body is composed of the two infrared and red light
SpO based on the waveform signal₂Calculate the number of beats
Is displayed together with the waveform signal. The body movement noise is the oxime of the present invention.
Removed during the process in the adapter for adapters. Body movement
If the well-known method mentioned above is adopted for the noise removal method,
Good. If the adapter has a body motion noise removal function,
Old type that does not have the function that the oximeter body has
Even if the correct SpO₂Values and beats can be obtained
You. [0015] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Ming oximeter adapter embodiment in detail
explain. FIG. 1 shows an oximeter adapter according to the present invention.
Is a schematic diagram showing an oximeter system incorporating
You. In addition, (a) in FIG. 1 is an external appearance schematic diagram, (b) in FIG.
It is the schematic which shows an electrical structure. This oximeter system has a noise reduction function.
Oxymeter body 2 that does not have a leaving function and fingertip
Sensor part 3 to be attached, and interposed between them
And an oximeter adapter 1. What
Contact, oximeter body 2 and oximeter adapter
-1 is connected by a connecting cable 2 ', and
Sensor part 3 is a sensor to the oximeter adapter 1
They are connected by a cable 3 '. The oximeter
The main body 2 is not limited but has no noise removing function.
Shall be. As shown in FIG. 1B, the sensor
The unit 3 includes an infrared LED 31 and an infrared LED for irradiating the fingertip with infrared light.
A red light LED 32 for irradiating the fingertip with red and red light;
Light-receiving diode that receives infrared light and red light transmitted through
And a calibration resistor 34.
I have. Here, the calibration resistor 34 is oxygen
Depends on the wavelength of infrared light and red light when calculating saturation
This is for setting the coefficient to be set. Also for infrared light
The LED 31 and the red light LED 32 are arranged in opposite polarities.
Are connected in columns and selected by the LED drive signal given in common.
Driven selectively. FIG. 2 shows the oximeter adapter 1 in detail.
It is a block diagram shown in detail. This oximeter adapter
The putter 1 receives the signal from the sensor unit 3 and
Signal and SpO₂A first processing unit 11 for outputting a value;
Receive R signal and receive light signal (IR signal and R signal)
2nd processing section which outputs and supplies to the oximeter main body 2
12 are provided. The first processing unit 11 receives the received light signal.
AC / DC that converts signal (analog signal) to digital value
Converter 11A and light receiving signal converted to digital value
And a microprocessor 11B for processing
You. The microprocessor 11B performs the following processing.
And the oxygen saturation (hereinafter referred to as SpO₂Calculation)
And the calculated SpO₂And an infrared light waveform signal (hereinafter, IR signal)
To the second processing unit 12. SpO₂Is k_λ= ｛(DIR / IR
DC) / (dR / RDC)} and calibration resistance
Anti-34 value Rcal (this is the infrared and red light used
Wavelength λ₁, Λ₂Given as an argument corresponding to
From, for example, using a lookup table
You. By the way, in the first processing unit 11, the correct S
pO₂The body motion noise is removed to calculate the value of. body
A known method may be used as a method for removing dynamic noise.
As shown in FIG. 15, when the fluctuation phases of the IR wave and the R wave are shifted
In the case of motion,
Set the option flag. On top of that, IR and R waves
Eliminate superimposed body motion noise. As a method of removal
For example, perform a Fourier analysis of each waveform and
Spectrum for the frequency giving the maximum amplitude of the vector
Use waveforms. Remove body motion noise in this way
Then, the fluctuation phase of the IR wave and the R wave does not shift, and S
pO₂Can be correctly detected. On the other hand, when stationary (normal, that is, there is no body movement)
State), the IR wave and the R wave usually have a single chevron shape.
Since the number of beats can be calculated, the first processing unit 11
Calculates and outputs the number of beats. Next, the waveform processing executed by the second processing unit 12
Will be described. This waveform processing is performed in the second processing shown in FIG.
The processing is performed by the waveform processing circuit 102 of the processing unit 12. Waveform
The processing circuit 102 receives the input SpO₂, IR wave
And not shown in FIG. 7, but the number of beats, motion signals, etc.
102P that executes processing based on
And, for example, three memories A, B and C. By the way, when observing the IR wave, FIG.
As shown in A) of 3), normally, when stationary (normal)
Has a single chevron wavelength, and there is little motion
The pulse wave has at least two peaks. By the way, figure
As shown in 3B), at rest (normal)
There is also a double-peak waveform with at least two peaks.
In such a case, at least three pins
The waveform has a peak. For a pulse wave having a plurality of peaks, one peak
When processing based on the shape of a pulse wave, each peak is regarded as one pulse wave.
The number of beats is counted more than twice to judge
Has disadvantages. To solve this problem, the second processing unit 1
The second waveform processing circuit 102 performs the following processing flow, for example.
Execute. As shown in FIG. 4, first, in step S100
Reads the IR raw waveform stored in memory A every beat
You. The number of beats is calculated by, for example, Fourier analysis of the waveform
It is determined by detecting the frequency that gives the maximum value of the amplitude.
Set. For each raw waveform read, step S
In step 101, the starting point of the waveform is obtained, and the next step S
At 102, the first peak value is detected from the starting point
The waveform from the start point to the first peak value.
It is stored in memory B. In the next step S103, the first
Appropriate decreasing function from peak value to next starting point, example
For example, interpolate with an exponential function and store this interpolated waveform in memory B
I do. The process of step S103 is schematically illustrated.
As shown in FIG. 5, one raw IR waveform NIR
Two mountains M out of shape₁, M₂First, if you have
Start point S₁First mountain M from₁Until the waveform α
It is stored in the memory B as it is. First mountain M₁From next star
Point S₂The second mountain M in the section up to₂Raw waveform including
Ignore β and interpolate with a suitable decreasing function. The interpolation waveform is
What is necessary is just a decreasing function without a peak. For example, β1
Is the first mountain M₁Symmetrical memory waveform
Set the waveform from zero to the next start point as zero.
It is a thing. β2 reduced the rate of decrease of β1 by half
Therefore, if it does not become zero at the next start point S2,
Force to zero. β3 is a gentler decreasing function,
For example, using an exponential function, the next starting point S₂Then, forced
It is the one that has been zeroed. By performing the interpolation as described above, the waveform of the memory B is obtained.
Is always used during normal or body movement
You can know your heart rate accurately even if there are two peaks in the waveform
No double counting. FIG. 6 shows both a stationary state and a motion state.
It shows the processing flow considered. In step S200, the IR raw waveform is converted to two heartbeats.
The above is stored in the memory A, and each stored raw waveform is
First, the peak (mountain) in one waveform is detected using differentiation.
I do. If it is one mountain, proceed to step S202,
If there are a plurality of mountains, the process proceeds to step S203. Step S2
In 02, a single peak waveform is stored in the memory C. Next,
In step S204, whether the vehicle is stationary or in motion is determined by a flag.
Judge. This flag indicates that the IR wave and the R wave
When motion is not synchronized, “1” is set and both waves are synchronized.
It is set to "0" at the expected standstill. If it is determined that a motion has occurred,
The one-peak waveform stored in step S202 is read from the memory C.
put out. If it is stationary, step S206
The raw IR waveform from memory A
Use the IR generated wave of the system. If there are a plurality of mountains, the process proceeds to step S203.
Start point is detected and the first peak from the start point is detected.
(Mountain) is detected from the start point to the first peak value.
The waveform is stored in the memory B (step S208),
Interpolation from the peak value to the next start point with an appropriate decreasing function
Then, the interpolation waveform is stored in the memory (step S20).
9). This is based on the presence or absence of motion as described in FIG.
Is used regardless of the memory B. By performing the above processing, one waveform
Even if there are multiple mountains, only one mountain can be counted.
Can detect the correct heart rate,
Unaffected waveforms can be transmitted to the oximeter
You. Note that the present invention is not limited to the above processing method.
Reproduction processing of waveforms other than single-peak waveform using single-peak waveform
What is necessary is just to perform. FIG. 7 shows the oximeter system of FIG.
It is a block diagram which shows a structure in more detail. Oximeter
The adapter 1 for infrared light is an LED 3 for infrared light of the sensor unit 3.
1 and a driving signal by applying a driving signal to the LED 32 for red light.
Operating LED drive circuit 103, while the first processing unit
SpO output from 11₂Process values and IR waveforms,
IR signal and R signal, and resistance value R as an argument
and a second processing unit 12 that outputs o. On the other hand, the oximeter main bodies 2
LED and red light connected in parallel with opposite polarities
LED designed to supply drive signal to LED
Input drive circuit 21 and output signal from light receiving diode
Infrared light signal (hereinafter referred to as IR signal), red light
Processing such as extraction of a signal (hereinafter, referred to as an R signal) is performed.
A signal processing unit 22 and an output signal from the signal processing unit 22 and
And the signal given from the calibration resistor Ro
Oxygen saturation (SpO₂SpO to output value)
₂The arithmetic processing unit 23 and the SpO₂Display 24 for displaying values
And In order to display the pulse waveform,
The extracted IR signal or R signal is converted to SpO₂Arithmetic processing unit
23 after changing to an appropriate signal size
24. The second part of the oximeter adapter 1
The processing unit 12 outputs the SpO output from the first processing unit 11.₂
From the values and the IR waveform, the IR and R digital signals
The output waveform processing circuit 102 and the LED drive circuit 21
First photocoupler 1 for selectively receiving these drive signals
04, the second photocoupler 105 and the first photocoupler
Constant voltage input using the signal received by ー 104
The first constant voltage generator 106 and the second photocoupler 10
The signal received by step 5 is used as an input to make a constant voltage.
(2) The constant voltage of the constant voltage conversion unit 107 and the first constant voltage conversion unit 106
Analog with output and digital value IR signal as input
1st D / A resistance array 108 which outputs IR signal with value
And the constant voltage output of the second constant voltage conversion unit 107 and the digital
Outputs an R signal as an analog value with the R signal as an input
Second D / A resistor array 109 and analog value IR signal
And the R signal to the signal processing unit 22 of the oximeter body 2
And a third photocoupler 110 for transmitting to
I have. By the way, the waveform processing circuit 102
Average value IRDC (DC component) and change component dIR of R signal
(AC component) and the R signal according to the following equation.
Generate. R = IRDC + (1 / kλ) · dIR pinch
The DC component RDC of the original R signal is
Replaced by minutes. Here, 1 / kλ is infrared light, red
SpO when the wavelength of light is fixed in advance₂With a value corresponding to
is there. Here, when the above substitution is verified, SpO₂To
The formula to determine is   (DIR / IRDC) / (dR / RDC)   = (DIR / IRDC) / {(1 / kλ) · dIR / IRDC} = kλ And the calculation is simplified. The digital value of R calculated by the above equation,
The digital value of IR used for the calculation is the second D / A resistance array.
A 109, and is supplied to the first D / A resistor array 108.
Each D / A resistor array follows its waveform as described later.
Analog SW array so that the reciprocal of the resistance changes
Is controlled by In the figure, symbolized as a resistor Ro
, The Sp in the oximeter body 2
O₂The value of Ro as an argument for the calculation of
To the main body 2. On the other hand, the LED drive of the oximeter main body 2
The circuit 21 includes an LED for infrared light (the first photocoupler 10
4), red light LED (second photocoupler)
105 light-emitting elements) to light up according to a certain rule
Signal is being output. Each light emission is received by the corresponding light receiving element.
Current and generate a current.
Create a constant voltage power supply equivalent to. Connect each constant voltage power supply
When applied to the corresponding D / A resistor array,
The current flowing through the anti-array depends on the light emission type of the corresponding LED.
It becomes the analog current value of IR and R according to the timing. So
By combining these currents, IR and R
13 (c) or (f) in FIG.
To obtain such a current value. The current is supplied to the third photocoupler 11
0 light emitting element to emit light, and the light emission is received by the light receiving element.
The current to the oximeter body 2
Signal from the unit. FIG. 8 shows another example of the oximeter adapter.
FIG. 3 is a block diagram illustrating a configuration example. For this oximeter
Adapters share a D / A resistor array
It is different from the oximeter adapter of FIG. You
That is, the constant voltage output of the first constant voltage generator 106 is
Signal to the first AND circuit 111 as a digital signal
And gates the constant voltage output of the second constant voltage generator 107
A digital value R signal is supplied to a second AND circuit 112 as a signal.
And outputs from both AND circuits to an OR circuit 113.
To the D / A resistor array 114 to generate the first constant voltage.
The constant voltage output of section 106 and the constant voltage of second constant voltage
The voltage output is passed through the OR circuit 115 to the D / A resistor array 1
14 is applied. If this configuration is adopted, both photocouplers
A signal can be obtained in accordance with the light emission of the light emitting element of
Signal can be transmitted to the oximeter body 2.
You. FIG. 9 shows still another configuration of the oximeter adapter.
It is a block diagram which shows a part of example. This oximeter adapter is the first
Switch to a photocoupler and a second photocoupler
The oximeter adapter shown in Fig. 7
Different from Putter. That is, one constant voltage power supply 1
15 constant voltage outputs are connected in parallel with opposite polarities.
The first D / A resistor A is connected through a pair of switches SW1 and SW2.
Ray 108 and the second D / A resistor array 109
You. When this configuration is adopted, the same configuration as that of FIG.
Action can be achieved. FIG. 10 shows a waveform processing circuit 1.
Transmit IR signal and R signal from 02 to oximeter
Is an example of an electric circuit showing a configuration for performing the above. Operation of this configuration
Is as follows. LED DRIVE SIGNA
Depending on L, a pair of photocouplers PCTir, PCTr
LED is turned on alternately, alternately with the phototransistor
To generate current. Next, the resistance of the resistors r0iR and r0R
By changing the resistance, the IR and R output of the LED
Adjust the strength and extract as voltage. Next, a transistor Qir (corresponding to IR),
Phototransistor voltage at the base of Qr (corresponding to R)
To obtain outputs ViR and VR. These are constant voltage
Have been. The circuit then connects to the resistor group in parallel.
You. ViR is connected to each resistor and ir-array,
Fall in the land. Each connected to the ir-array
The resistances are r19, r18, r17... R12. ir
-In the array, each switch is connected to each resistor
You. When the switch is turned on, current flows through the resistor
You. The on-off control of each switch is
This is performed with the incoming IRW digital signal. The same goes for VR,
The control is performed by the RW digital signal. The currents Ir and Ir are represented by the following equations, respectively.
Is done. Iir = ViR (1 / r19 + 1 / r18 +... + 1 / r
12) Ir = VR (1 / r19 + 1 / r18 +... + 1 / r1
2) Here, 1 / r19, 1 / r18, ..., 1 /
r12 is turned on or off. this
These values are chosen relatively as follows. 1 / r19 = 2⁷,
1 / r18 = 2⁶, 1 / r17 = 2⁵, ..., 1 / r12
= 2 ⁰Then, the D / A conversion corresponding to the digital amount of 8 bits
It becomes a heat exchanger. This converter uses IR digital and R digital
A signal is given to obtain a current value corresponding to (c) in FIG.
Combine them, pass through the mirror circuit, split the flow,
Input to the dynamic amplifier and perform photoelectric conversion with PC DIODE
Then, the signal is input to the oximeter body 2. on the other hand,
The pre-determined resistance value Ro is the value of the oximeter
Input to main unit 2. This allows the oximeter body 2
Is the noise-removed SpO₂And display pulse waveform
Can be. In this case, D / A conversion of 8-bit data was performed.
However, the number of bits can be changed as needed. FIG.
1 is a modified example of the configuration in FIG. This configuration is different from the configuration of FIG.
r-array, resistance ri in parallel with r-array
It is only the point where RD and rRD are connected. The purpose
Is equivalent to the DC component of the digital value IR signal and R signal
And apply resistances riRD and rRD, and
This is to increase the decomposition rate by applying to the stream. Use this
In order to separate the AC component in advance,
control the array and the DC component is ViR / riR
It is necessary to adjust D = VR / rRD. It should be noted that the circuits shown in FIGS.
The light emitting element of the third photocoupler PCDIODE
In order to guarantee the linearity of the element,
Provide a light receiving element and feedback the output of the light receiving element.
To provide a linearity compensation circuit
Insert a resistor to adjust the voltage applied to the ray
Needless to say, the necessary improvements such as
No. [0052] According to the present invention, in the first processing unit,
SpO₂Based on the IR wave obtained as the received light signal
And the R wave is generated by the second processing unit.
Specifically, a waveform close to a raw waveform can be generated. Ma
In addition, it is possible to remove body motion noise during the above process.
The oximeter body has a body motion noise removal function
Even if the adapter is not provided,
Connection between the sensor and the oximeter body.
The oximeter body is an IR wave from which body motion noise has been removed.
And SpO using R wave₂You can calculate the value
Wear. Furthermore, the displayed IR wave and R wave reduce the raw waveform.
Artificially generated because it reflects at least a part
Natural waveforms are obtained differently from the ones.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing an oximeter system incorporating an oximeter adapter of the present invention. FIG. 2 is a block diagram showing the oximeter adapter 1 in detail. FIGS. 3A and 3B show pulse waveforms at rest and during body movement, respectively, wherein A) shows a normal case, and B) shows a special case. FIG. 4 is a flowchart illustrating an example of a process executed by a first processing unit 11; FIG. 5 is an explanatory diagram showing a waveform interpolation method of a pulse waveform having a plurality of peaks. FIG. 6 is a flowchart illustrating another example of the processing executed by the first processing unit. FIG. 7 is a block diagram showing the configuration of the oximeter system of FIG. 2 in more detail. FIG. 8 is a block diagram showing another configuration example of the oximeter adapter. FIG. 9 is a block diagram showing still another configuration example of the oximeter adapter. FIG. 10 is an electric circuit diagram showing a configuration for transmitting an IR signal and an R signal from an arithmetic circuit to an oximeter. FIG. 11 is an electric circuit diagram showing another configuration for transmitting the IR signal and the R signal from the arithmetic circuit 102 to the oximeter. FIG. 12 is a schematic view showing a conventional pulse oximeter. FIG. 13 is a waveform diagram illustrating the operation of a conventional pulse oximeter. FIG. 14 is a diagram illustrating an example of an IR signal and an R signal when there is no body motion noise. FIG. 15 is a diagram illustrating an example of an IR signal and an R signal when there is body motion noise. [Description of Signs] 1 Adapter for oximeter 2 Oximeter main body 3 Sensor unit 11 First processing unit 12 Second processing unit 33 Light receiving diode 34 Calibration resistor

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Koichi Tokuda             3-31 Ichigaya Nakanocho, Shinjuku-ku, Tokyo Thailand             Co-Healthcare Japan Co., Ltd. (72) Inventor Yasuhiro Iizuka             3-31 Ichigaya Nakanocho, Shinjuku-ku, Tokyo Thailand             Co-Healthcare Japan Co., Ltd. F term (reference) 2G059 AA01 BB12 CC20 EE12 GG02                       HH01 KK01 MM01 MM09 NN10                 4C038 KK01 KL05 KL07 KX04

Claims (1)

Claims 1. An oximeter adapter (1) inserted between a sensor unit (3) and an oximeter body (2), the oximeter adapter being provided on the sensor unit (3). First processing means (11) for receiving a signal from the light receiving means (33) and outputting an oxygen saturation signal and an infrared light signal; and generating a red light signal based on the infrared light signal; An oximeter adapter, comprising: a second processing means (12) for outputting the light signal and the generated red light signal.