JPH0578331B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a medical measurement device that can select measurement values from a plurality of measurement data and display highly reliable measurement values.

[Conventional technology]

Various conventional medical measurement devices usually have means for displaying measured values. For example, in a measuring instrument with relatively high measurement accuracy and reproducibility, such as an autorefractometer used in ophthalmology, the measured value is displayed after each measurement.
After a plurality of measurements are taken, the printer prints out the past measurement values and representative values. In other words, since the variation in measured values from each measurement is small compared to the required accuracy, there is no need to constantly compare the measured values from the previous multiple times to determine whether the measurements were performed correctly or not. Multiple measurements are performed only to further improve the accuracy of the representative value output.

However, with ophthalmological measuring instruments such as non-contact tonometers, where measurement values tend to fluctuate significantly depending on the device's alignment state, the subject's visual fixation movements, and the psychological state, multiple measurements are always required. The true measurement value must be established based on the measured values of the eye-scanned individuals, which are obtained stably, and it is important to always keep track of the multiple measurements taken directly. becomes. Therefore, consideration has been given to displaying past measured values chronologically.

[Problem that the invention seeks to solve]

However, in such conventional devices,
Due to limitations of display means, it is impossible to display too much data at the same time. For example, if only a finite number of measured values are displayed, it is necessary to rely on a separate means such as a printer for the measured values before that display, and it is necessary to use a separate means such as a printer to obtain sufficient information from past measurements. It cannot be used for

For example, to explain the outline of measurement data processing in a conventional non-contact tonometer with reference to FIG.
When the controller measures the intraocular pressure of the eye E, the controller 2
receives the measured value, and at the same time displays 3 and memory 4.
and output to the printer 5 as necessary. The memory 4 stores past data b, c, d,
e, . . . are stored in the memory 4 at addresses 41, 42, 43, 44, . . . in data order, respectively. On the display 3, the past three data b, c,
d is displayed. Therefore, the medical examiner looks at the intraocular pressure values displayed on display 3, for example, 14, 17, and 16 mmHg, and
If the dispersion is still large, for example in this case
If the measurement value is 14mmHg, it will be determined that there is some kind of error and the measurement will be taken again.

FIG. 4 shows a case where the next measured value a=17 is obtained, and the measured value a is stored at address 41 of the memory 4, and the contents of the memories below b are moved one address at a time. At the same time, the same operation was applied to display 3, and display 3 showed 17, 14, and 17mmHg.
This is displayed. At this time, if you look at the information on all past measurement values in memory 4, the order of measurement is 18,
The results are 16, 17, 14, and 17 mmHg, and the variations other than 14 mmHg are quite small, and the true value of the intraocular pressure of the eye E is
It was 16 to 18 mmHg, which cannot be determined based only on the information from the past three measurements. In order to make this determination, it is necessary to output to the printer 5 each time. Also, the data value just measured a=17mm
The same holds true for determining how reliable Hg is in relation to past measurements as a whole.

[Purpose of the invention]

An object of the present invention is to provide a function of calculating a representative value of stored measured values and selecting and displaying a plurality of measured values close to the representative value, thereby allowing information on previously measured measured values to be displayed. The objective is to provide a medical measuring device that can be used more effectively.

[Summary of the invention]

The gist of the present invention to achieve the above objects is as follows:
a measuring means for measuring a predetermined constant of a living body; a means for storing a plurality of measured values obtained by the measuring means; a means for displaying a plurality of specific measured values among the stored measured values; A medical device comprising: arithmetic means for calculating a representative value of measured values; and means for selecting a measured value with a small difference from the calculated representative value and displaying the selected measured value on the display means. It is a measuring device for

[Embodiments of the invention]

The present invention will be explained in detail based on the embodiments shown in FIGS. 1 and 2. Note that the same reference numerals as in FIG. 3 indicate the same members.

FIG. 1 is a block diagram of a non-contact tonometer to which the present invention is applied, and a shows a block diagram seen from the side. A nozzle 11 and an objective lens 12 are provided facing the cornea Ec of the eye to be examined, and an air compression chamber 14 in which a glass window 13 is formed on the optical axis of the objective lens 12 behind these, a half mirror 15, a focal plane 16,
An eyepiece 17 is arranged so that the examiner O can observe the eye to be examined through the eyepiece 17. Also, the focal plane 1 on the reflection side of the half mirror 15
An index 18 is provided at a position conjugate to 6.
The compression chamber 14 includes a cylinder 1 for generating air pulses that are emitted to the cornea Ec through the nozzle 11.
9. Pilton 20 is connected, Pilton 2
0 is driven by a rotary solenoid 21 in the direction of the arrow.

Figure 1b shows a plan view of the apparatus, with objective lens 1
Consists of two optical systems that are symmetrical about the optical axis of
A measurement system is provided to measure the deformation of the cornea Ec of the eye to be examined due to the air pulse. That is, the infrared light emitting diode 22 has an aperture 23 and a collimator lens 24.
When the cornea Ec undergoes a predetermined applanation, for example, by an air pulse, the light beam is reflected by the cornea Ec and is focused on the pinhole 26 via the condenser lens 25. The light is received by a photodetector 27. In this measurement system, the output of the photodetector 27 is configured such that it becomes maximum when the cornea Ec undergoes the aforementioned predetermined deformation. The output of the photodetector 27 is connected to the controller 2 via a peak detection circuit 28.

For alignment of the apparatus, the index 18 is projected onto the cornea Ec of the eye to be examined via the half mirror 15 and the objective lens 12, and the reflected image is again focused on the focal plane 16 of the eyepiece 17 by the objective lens 12. This is performed using a visual alignment system in which the examiner O observes through the eyepiece 17. After the examiner O performs alignment using this visual alignment system, when he presses a measurement switch (not shown), the rotary solenoid 21 is driven and an air pulse is emitted from the nozzle 11 toward the cornea Ec. The cornea Ec is deformed by this air pulse, changing the output of the photodetector 27 of the measurement system, but the peak detection circuit 28 connected to the photodetector 27 detects the peak of the output and sends the detection signal to the controller. 2
Output to. Upon receiving this signal, the controller 2 reads the time of occurrence, converts this into an intraocular pressure value, and displays it on the display 3. Display 3 is 4
Areas 31, 32, 3 for displaying measured values
3 and 34 are prepared, area 31 is the part that displays the immediately previous measurement data, and areas 32 to 34 are the area 3 that is close to the average value which is the representative value of all the measured values of past measurements.
This is the part that displays two measured values.

As explained in FIG. 4, assume that the measuring section 1 obtains the measured value a=17. The controller 2 receives a signal corresponding to the measured value a=17 from the peak detection circuit 28, converts it into an intraocular pressure value, controls the memory 4 in the same way as the conventional device shown in FIG. A=17 is displayed blinking in the area 31. At this point, areas 32 to 34 of the display 3
is the average value of all measured values b, c, d, e in memory 4
Measurements close to 16.25 are displayed, d=16, c=17,
e=18 are displayed in descending order. In this state, the examiner can compare the new measured value on the display 3 with other measured values and confirm that the current measurement was performed correctly since the difference is small. Thereafter, after one hour has passed in this state, the controller 2 calculates the average value of all measured values a, b, c, and e in the memory 4. The average at this time is 16.4, but calculate the difference between this value and each measured value, and d = the smaller difference.
16, a=17, and c=17, and similarly display in areas 32 to 34 in ascending order as shown in FIG. At the same time, the measured value a=17 is
In order to show that it has been incorporated into the process of averaging and selection, the display in area 31 stops blinking, and the displays in areas 32 to 34 indicate that the measured value currently being displayed in area 31 is displayed. Therefore, display 3
Control is performed such that the display in area 33 starts point reduction. The device takes the next measurement in this state, and examiner O
are the measured values 16, 17, 17 of areas 32 to 34 in this state
When looking at the mmHg value and determining that a measurement value with a sufficiently small range of variation has been obtained, the measurement of the eye to be examined is completed.

For example, due to some error in the previous measurement, a=22
Next, consider the case where the measured value is obtained. The device performs the above operation, but the resulting display shows a=22 in area 31, and d=16, c=17, and e=18 with less variation in areas 32 to 34. There is even. In such a case, examiner O decides that the current measured value a = 22 is significantly different from the past measured value and is not very reliable, and after looking at the past data, decides that there is still a large variation and tries again. The decision will be made to attempt to measure the

The number of past measured values displayed on the display is 3, but the number is not limited to this, but with a non-contact tonometer, this is the number due to the cost of display, measurement accuracy, and standard number of measurements. The number of is appropriate. Moreover, having the same display mode as the conventional one at the same time is effective when observing short-term fluctuations in intraocular pressure, and is also easy to use. In addition, although the average value was used as the representative value in the previous example, almost the same effect can be obtained even if the median value is used, and if the number of measurements is smaller, such as an autorefractometer, the mode value can be used. You can also take In addition, although the display order was in ascending order in the previous embodiment, there is no problem even if the display order is reversed.

〔Effect of the invention〕

As explained above, the medical measurement device according to the present invention can more effectively utilize information on past measurement values, and provides the examiner with information for determining the reliability of the measurement value taken just before. Instead, it is possible to provide information for determining whether it is okay to terminate the measurement by assuming that a value close to the true constant of the eye to be examined has been obtained through a series of measurements, or whether additional measurements are required. Become. This eliminates the need for unnecessary measurements and placing an unnecessary burden on the eye to be examined, improves the effectiveness of medical treatment, and has the effect that accurate measurements with constant reliability can be performed at all times.

[Brief explanation of drawings]

The drawings show an embodiment in which the medical measurement device according to the present invention is applied to a non-contact tonometer. FIG. 3 and FIG. 4 are explanatory diagrams of measurement data processing of a conventional ophthalmological measuring instrument. Reference numeral 1 denotes a measurement unit, 2 a controller, 3 a display, 4 a memory, 12 an objective lens, 18 an index, 22 an infrared light emitting diode, 27 a photodetector, and 28 a peak detection circuit.

Claims (1)

[Claims] 1. A measuring means for measuring a predetermined constant of a living body, a means for storing a plurality of measured values obtained by the measuring means, and a means for storing a plurality of specific measured values among the stored measured values. a calculating means for calculating a representative value of the stored measured values; and a means for selecting a measured value having a small difference from the calculated representative value and displaying the selected measured value on the display means. A medical measuring device characterized by: 2. According to claim 1, the display means has a mode for displaying measured values in chronological order, and has a switching means for switching to a mode for displaying the measured values selected by the selection means. medical measurement equipment. 3. The medical measuring device according to claim 1, wherein the display means displays the selected measurement values in a predetermined arrangement. 4. The medical measuring device according to claim 1, wherein the representative value calculated by the calculation means is an average value. 5. The medical measuring device according to claim 1, wherein the representative value calculated by the calculation means is a median value.