JPS60243506A - Measuring probe - Google Patents

Abstract

PURPOSE:To prevent the mixing of errors in processing and to improve the yield and interchangeability of a measuring part, by providing an information detecting element, an output terminal and an output means for outputting the characteristic information of a probe, and mechanically performing the notification of the characteristics to a processor. CONSTITUTION:The temperature information in a living body is converted into an electric signal by a temperature measuring element 3 built in a temperature measuring catheter 2. The signal is sent to a signal processor 15 through lead wires 4 and 14 and connecting parts 5 and 13. A plurality of recesses are provided in the catheter 2 and magnets 6 are put in. A characteristic output means, which has several coded values that are weighted based on the states of the presence or absence of the magnets, is provided. There are dispersion in kinds and production in the elements 3, and the temperature/output characteristic are not the same. The elements can be classified into several kinds. The classification is made to correspond to the states of the magnets 6 and the recesses. The state is detected by a magnetism detecting element 12 and sent to the device 15. In the device 15, the correction of the electric signal is performed by various means, and the catheter 2 can have interchangeability.

Description

Detailed Description of the Invention ■9 Background of the Invention A, Technical Field The present invention relates to a measurement probe, and more particularly to a measurement probe equipped with a characteristic output means for outputting the characteristics of an information detection element that detects measurement information. be.

B. Prior art and its problems Originally, elements such as temperature information detection elements (for example, thermistors) have variations in measured values/output characteristic values due to manufacturing. Therefore, when manufacturing measurement probes using elements with such variations in characteristic values, various measures have been taken to make the measurement probes compatible.

One of them is to select based on the characteristic value of the information detection element.
This method uses only those within the allowable range of measurement errors caused by variations in characteristic values. However, this method requires sorting and has the disadvantage that the yield of temperature measurement information detection elements is low and the price is relatively high.

Another method is to correct the variation in the characteristic values of the information detection element, so that the information detection is performed so that the characteristic value of the measurement information output from the measurement probe becomes the standard value determined at a certain standard temperature. This is a method in which adjustments are made by attaching or adding other parts to the element. When making adjustments using other parts,
For example, when a thermistor is used as the information detection element, a correction resistor is used as another component, but there are disadvantages in that it takes time and skill to adjust the resistance value. Furthermore, when adding other parts, it is difficult to manufacture the connection part of the measurement probe, and the shape of the connection part becomes large.

If the characteristic values of the temperature measurement elements are completely different, it is almost impossible to make the measurement probes compatible.

An object of the present invention is to propose a measurement probe that enables characteristic value correction processing corresponding to the characteristic information on the processing means side by outputting the characteristic information of the information detection element together with the measurement information from the probe that outputs the measurement information. There is a particular thing.

Another object of the present invention is to propose a measurement probe that is easy to manufacture and has excellent compatibility.

Another object of the present invention is to propose a measurement probe that is easy to change and replace.

An object of the present invention is to provide a measurement probe that provides measurement information to a processing means for processing measurement information, and the measurement probe includes an information detection element and an information detection element that outputs measurement information obtained by the element. This is achieved by a measurement probe characterized by comprising an output terminal and characteristic output means for outputting characteristic information specific to the information detection element.

Further, according to a preferred aspect of the present invention, the characteristic output means is an output section that forms a coded output by an arrangement of magnetic pieces, and the information detection element is a thermistor. It is.

(1) Detailed description of the invention A measurement probe according to an embodiment of the invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing the structure of a temperature measuring probe and its connecting portion according to an embodiment of the present invention. The probe of this embodiment is placed in the heart to measure the temperature of blood, and is called a temperature measurement catheter. 1 in the figure is Rikiko-koru Baiyai Ara tl
It is made of a material that has an indispensable lead-tin property, such as plastic. 2 is a temperature measuring catheter, 3 is a temperature detecting element consisting of a thermistor, 4 is a lead wire connecting the temperature detecting element 3 and the connecting pin 5, 5 is a connecting pin, 6 is a magnet,
7 is a recess for housing the magnet 6.

Further, FIG. 2 shows the structure of a connecting portion that pairs with the catheter connecting portion 1 shown in FIG. 1. In the figure, 11 is a connection part that pairs with the catheter connection part 1 in FIG. 1, 12 is a magnetic detection element that detects the magnetism of the magnet 6 disposed in the recess 7, and 13 is connected to the connection pin 5 in FIG. 14 is a lead wire. Further, 15 is a signal processing device which is an example of means for processing measurement signals.

As shown above, the catheter of the embodiment has a temperature detection element 3.
This is a temperature measuring catheter 2 having a measurement information output terminal pin 5 to which a lead wire 4 is connected, and a characteristic output means having a configuration including a lug or a plurality of recesses 7 in which a magnet 6 can be placed.

In use, the connection part 11 of the processing means is inserted into the cavity of the catheter connection part l, the connection pin 5 of the output terminal and the socket 13 are connected, and the presence or absence of the magnet 6 provided in the characteristic output means is checked. Both are placed in opposing positions so as to be detected by the magnetic detection element 12 of the means. Temperature detection element 3 built into temperature measurement catheter 2 converts temperature information in the living body into an electrical signal, and the electrical signal is transmitted to connection pin 5 via lead wire 4 . However, the value of this electric signal does not have the same temperature/output characteristics due to the type of temperature detection element 3, manufacturing variations, etc.

Now, a concave portion 7 is provided in the catheter connection portion 1 so that a magnet 6 can be placed therein, and two types of states are created: whether or not the magnet 6 is present in the four portions 7. If the recessed portions 7 are arranged in N directions, then in other cases, 21 different recesses are formed in that state. Therefore, by weighting the four parts 7, a coded value of 2 is obtained.

If the variation in the characteristics of the temperature detection element 3 described above is already known, it is possible to divide the distribution of the variation based on the measurement tolerance and classify it into several ways. According to the classification, the characteristic values of the temperature detection element 3 are determined in the recess 7 described above.
This can be associated with the state created by the presence or absence of the magnet 6 inside.

If the number of classifications is A, then N≧lo
It is sufficient to provide four parts corresponding to g 2 A, and it is sufficient to provide a maximum of N magnets. and the same number of connections 1 as the number of recesses.
The state is detected by the magnetic detection element 12 disposed at 1, and is transmitted to the signal processing device via the lead wire 14.
At the same time, the signal processing device 15 corrects the electrical signal of the temperature detection element 3 transmitted via the connection socket 13 in various ways, so even if there are variations in the characteristic values of the temperature detection element 3, the temperature can be measured. Catheters are compatible. In order to arrange the magnets in the four parts 7, the magnets 6 are placed through the upper openings of the four parts 7 corresponding to the classification of the temperature detecting elements 3 described above, and a cover is attached to cover the entire surface from the upper surface of the recessed parts 7. Alternatively, the magnet 6 may be placed from the lower opening of the recess 7 and a cover covering the entire lower part may be adhered.

FIG. 3 shows an example in which the values obtained by weighting the recesses 7 and symbolizing them according to the presence or absence of the magnet 6 are correlated with the above-mentioned variations in the characteristic values of the classified temperature detection elements 3.

In the figure, 20 indicates the characteristic distribution of the temperature detection element, and 21 indicates an example of division based on measurement tolerance.

For example, in the case of a temperature detection element having characteristic values 44 to 46, the magnet 6 is arranged so that the coded value is 7.

In the above explanation, we have described an example in which a thermistor used for temperature measurement is used as an information detection element, but it is possible to treat information detection elements with completely different uses such as temperature and strain measurement in the same way, and there are many examples. It becomes possible to create a measurement probe that is compatible with the following types of information detection elements.

The magnetic detection element 12 may include a pole element, a reed switch, a magnetoresistive element, etc., and the pressure compensation method by the signal processing device 15 may include arithmetic processing using four arithmetic operations, tabulated correspondence processing, and the like.

In addition, a magnetic material such as ferrite is arranged in place of the magnet 6,
The magnetization may be performed after the external appearance of the probe is completed. By doing this, the manufacturing process becomes extremely simple.

Next, the signal processing device 15 that performs temperature measurement using the measurement probe of this embodiment having the above configuration will be explained with reference to FIGS. 5 and 6.

FIG. 5 is a block diagram of the signal processing device, in which the catheter connection portion 1 and the connection portion 11 function as a connector, and the connection portion 11 is provided so as to face the outside of the casing of the signal processing device 15. . The signal processing device 15 includes a resistance value measuring circuit 3 that measures the resistance value of the thermistor depending on a specific temperature.
2. A converting the resistance value obtained by the circuit 32 into a digital value
/D converter 34.

The characteristic value of the temperature detection element detected by the magnetic detection element 12 is given to the decoder 36. The decoded output of the third day of the decoder is given to the ROM 38 as a read address of the ROM 38. Correction values corresponding to the type of temperature detection probe, characteristic values, etc. are stored in advance in the ROM 38, and data in the ROM at a designated address is read out to the microprocessor. The microprocessor 40 is internally equipped with a ROM for storing processing procedures according to the embodiment and a RAM for storing processing progress results, and reads digitized temperature information from the A/D converter 34 and from the correction ROM 38. The microprocessor 40 performs correction calculations based on the correction data and outputs the requested temperature information to the display/recording section 42 .

Further, this signal processing device 15 can also be realized by an analog circuit, and a specific example of this is shown in FIG. In FIG. 5, the characteristics of the temperature detection element 3 detected by the magnetic detection element 12 are decoded by the decoder 36, and the linearization adjustment signal 44.
The O point adjustment signal 46 and the gain adjustment signal 48 are input. The linearize adjustment signal 44 is transmitted to the linearize adjustment switch 44.
The adjustment resistor R1 or R2 is selectively connected to the signal line 50 that connects the (+) biased input of the non-inverting amplifier circuit 52 and the socket) 13 depending on the HIG) I or LOW level of the signal 44. , to compensate for variations in the output voltage of the temperature measurement catheter. 0 point adjustment value number 46 is 0 point adjustment switch 46
According to the HIGH or LOW level of the signal 46, the voltage of the reference power supply 51 is applied to the resistor R3, R4 or R3,
The voltage is divided into R5 and a zero point adjustment voltage is applied to the non-inverting amplification circuit 54. This compensates for variations in the temperature detection element resistance value at the reference temperature. The gain adjustment signal 48 is given to a gain adjustment switch 48S, and the HIG of the signal 4B
Gain adjustment resistors R7 and R8 according to H or LOW level
is connected between both amplifying circuits 52 and 54 to compensate for variations in the temperature sensing characteristics of the temperature sensing element. In this way, each output of both amplifying circuits 52, 54 is further applied to a differential amplifier circuit 53, and a normalized output voltage of the temperature measuring catheter is obtained from its output terminal 55.

■0 Effects of the Invention As described above, according to the present invention, since the measurement probe is provided with an output terminal for outputting measurement information and an output means for outputting characteristic information of the probe, the characteristics can be notified to the processing device. can be done mechanically.

Therefore, no errors are introduced into the processing.

Furthermore, by attaching the measurement probe to the processing means, it is possible to cause the processing device to perform processing that matches the characteristics of the probe, thereby making it possible to improve the yield and compatibility of the measurement section.

Furthermore, by providing the measurement probe with a characteristic output means as in the present invention, the characteristic value is notified to the processing device at the same time as the measurement probe is attached, so that the measurement probe can be changed or replaced at will. It is possible to prevent errors from occurring.

[Brief explanation of drawings]

Fig. 1 is a perspective view for explaining the structure of the measurement probe of the present invention, and Fig. 2 shows the structure of the connection part of the signal processing means connected to the measurement probe of the present embodiment shown in Fig. 1. A perspective view for explanation; FIG. 3 is a graph diagram showing the relationship between the characteristic distribution of the temperature detection element and the measurement tolerance; FIG. FIG. 4 is a block diagram of a signal processing device that measures temperature using this embodiment, and FIG. 5 is a circuit diagram of another signal processing device that measures temperature using this embodiment. In the figure, 1... Catheter connection part, 2... Temperature measurement catheter, 3... Temperature detection element, 4, 14... Lead wire, 5... Connection pin, 6... Magnet, 7... Recessed part, 11... Connection part that makes a pair with catheter connection part 1,
12... Magnetic detection element, 13... Connection socket, 1
5... Signal processing device, 36... Decoder, 44...
・Linearization adjustment signal, 46...0 point adjustment signal, 4
8...Gain adjustment signal.

Claims (3)

[Claims] (1) A measurement probe that provides measurement information to a processing means that processes measurement information, the measurement probe comprising:
A measurement probe comprising an information detection element, an output terminal for outputting measurement information obtained by the element, and characteristic output means for outputting characteristic information specific to the information detection element. (2) The measurement probe according to claim 1, wherein the characteristic output means is an output section that forms a coded output by an arrangement of magnetic pieces. (3) The measurement probe according to claim 1 or 2, wherein the information detection element is a thermistor.