JPH02239836A - Connection state detector - Google Patents

Abstract

PURPOSE:To obtain a connection state detector having the compatibility without giving changes to a relay cord, a voltage converter and a second connector by connecting a converting means for detecting bioinformation and a measuring means, detecting a current area to flow to the converting means or an impressed voltage, and detecting the connection state with the output. CONSTITUTION:Fifth and sixth connecting contact pins 7P5 and 7P6 are connected to a relay cord TC and connected through the contact cock seat and contact cock of the second connector to a disposable voltage converter. A contact cock seat 7S having fifth and sixth contact cock seat contact pins 7S5 and 7S6 is fitted to a measuring means 5, the fifth contact cock seat contact 7S5 is connected through a resistor 11 to compose a detecting element to a voltage source +Vcc, and the sixth contact cock seat contact 7S6 is grounded. The space between both terminals of the resistor 11 is connected to the input terminal of an amplifier 28, the output of the amplifier 28 is connected to the input terminal of one side of a comparator 12, and the input terminal of the other side of the comparator 12 is grounded. The current flowing to the resistor 11 is detected by the amplifier 28, thereafter, the level decision is executed by the comparator 12, and a USE/UNUSE signal is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a connection state detection device suitable for detecting the presence or absence of connection of a converter for invasive blood pressure measurement or the like.

[Summary of the invention]

The present invention relates to a connection state detection device suitable for detecting whether or not a converter is connected for invasive blood pressure measurement, etc., and includes a conversion means for detecting biological information, and a connection means for connecting the conversion means and measurement means. and a detection means for detecting the current flowing through the conversion means or the applied voltage, and the state of use or non-use can be detected by detecting the connection state of the connection means based on the output of the detection means. .

[Conventional technology]

In conventional polygraphs, etc., multiple electrodes or transducers (la) (lb) (lc)... (1n
), an electrode, transducer, and connection unit (1) consisting of relay cords, etc., an amplifier processing unit (2) corresponding to these electrodes and transducers (1a) to (1n), and a main amplifier (3).
It also consists of a display and recording device (4). Amplifiers and waveform processing units (2) are divided into strain, pressure, electrocardiogram, and DC amplifiers (2a), (2b), ... (2n), etc.; Many of the waveform processing unit (2), main amplifier (3), power supply (not shown), and display/recording device (4) are commonly used.The display/recording device (4) is an oscilloscope (4a).
, oscillograph (4b), magnetic recording device (4C)...
...Medical telemake (4n), etc. are used, and the transducers include a catheter transducer (1a) for invasive blood pressure, an electrocardiogram electrode (1b), and a pressure transducer (IC) that measures respiratory flow rate or flow rate, etc. )・Thermisk thermometer (1n) for measuring body temperature, etc. is combined.

The amplifier, waveform processing unit (2), main amplifier (3), and display/recording device (4) shown in FIG. The electrode and transducer relay unit (1) using the above will be explained with reference to FIG.

For example, the measuring device (5) is provided with a plug seat (7S) connected to the strain and pressure amplifier (2a).
The plug (7P) connected to S) is the first connector (7)
The plug (7P) is connected to the pressure transducer (la') through a connecting relay cord TC. This pressure transducer (la') is reusable, but catheter pressure transducers and the like need to be sterilized because they come into contact with blood, so a disposable pressure transducer (1a) is not safe. It is widely used because it is comprehensively economical, including sterilization management. This disposable pressure transducer (1
a) is connected to the spigot seat (6S) with the cord CO, and the spigot (6P) connected to the tip of the relay cord 1-'TC connected to the spigot (7P) is connected to the spigot seat (6S). It is configured to be joined to form a second connector (6).

Furthermore, in the conventional configuration, when the pressure transducer (1a) or (la') is connected to the measuring device (5), the connected state is detected and the unconnected state is displayed on the screen of the display/recording device (4), such as a CRT. It had the function of displaying the status and alerting the user.

Such a connection state detection mechanism is shown in FIG. Figure 7 shows details of the first connector [7] and measuring device (5) in Figure 6, and shows the first connector [7] of the measuring device (5).
The second connector (7S2) is connected to the ground source, and the first and second connectors (7P) of the first connector (7) are connected to the voltage source Vcc. The second plug contact pin (7P.) (7P2) is connected to the pressure transducer source through the power cord SC. The power cord and signal cord C are provided with a shield SE, and the ground line EL connected to the shield SE is grounded via the seventh plug contact pin (7P7) and the seventh plug seat contact (7S7). and pressure transducer (1a
The biological information signal from ) (la') is sent via the third and fourth plug contact pins (7P 3) (7P 4) and the third and fourth plug sockets (7S3) (7S4). It is connected to the distortion and pressure amplifier (2a). Furthermore,
The fifth socket contact (7SS) of the socket (7S) of the measuring device (5) is connected to +5V, and the sixth socket contact (736) is grounded via the resistor (9). and is connected to a Huffer amplifier (10). Also, the fifth and sixth plug contact pins (7P5)
A short pin (8) is connected between (7P6). In addition, the second connector (6) connected to the disposable converter (1a) is limited to one type due to the need for compatibility, and the signal is connected to four pins: power, ground, signal, and signal ground. limited to. Also, the first connection (
7) corresponds to various measuring devices (5), and matches the converter and the measuring device using a relay cord TC.

In the configuration shown in Fig. 7, by fitting the connector (7P) of the connector (7) into the connector seat (7S) of the measuring device (5), the output of the buffer amplifier (10) becomes "'usable"' ( Below is USI
When the connection is incomplete, that is, when it is unusable (hereinafter referred to as LINUSIE), it outputs a high (H) signal (hereinafter referred to as LINUSIE).

[Problem to be solved by the invention]

As mentioned above, the conventional disposable pressure transducer is connected to the relay cord TC via the second connector (6), and the plug (7P) connected to the tip of the relay cord TC is connected to the measuring device (
If the first connector (7) is completely fitted in order to attach and detach to the connector seat (7S) of 5), the short pin (8)
As a result, the Huffer amplifier (10) outputs an H signal for IISB. For this purpose a second connector (6)
The H signal for USIE will be output even if it is not completely connected. As mentioned above, this disposable pressure transducer (1a) is used in common with many models to ensure compatibility.
It was not possible to provide an E pin, so 4 pins were used.

The present invention has been made in view of the above-mentioned drawbacks, and its purpose is to provide a compatible connection state detection device without making any changes to the relay cord, pressure transducer, or second connector. This is what we are trying to do.

[Means to solve the problem]

An example of the connection state detection device of the present invention is shown in FIG. 1, which includes a conversion means (1) for detecting biological information.
, a connecting means (7) for connecting the converting means (1) and the measuring means (5), and a detecting means (30) for detecting the current or applied voltage flowing through the converting means (1). means(
The connection state of the connection means (7) is detected based on the output of the connection means (7).

[Effect]

Since the connection state detection device of the present invention detects the current flowing through the conversion means (1) or the applied voltage, the first connector (7) and the second connector (6) are connected in series to the relay cord. It is possible to reliably detect the attachment/detachment state even if the

〔Example〕

Hereinafter, various embodiments of the connection state detection device of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the basic structure of the connection state detection device of the present invention, and shows the same portion as the detection means of the connection state detection device using the short pin (8) shown in FIG. In Figure 1, the fifth and sixth connection contact pins (7PS) (7
P. ) is connected to the relay cord TC, and the second connector (
6) is connected to the disposable pressure transducer (1a) via the plug seat (6P) and plug (6S). The fitting seat (7S) having the fifth and sixth fitting seat contacts (7S5) (736) is attached to the measuring means (5),
The fifth socket contact (7S5) is connected to the voltage source +Vcc via a resistor (11) that constitutes a detection element,
The sixth plug seat contact (7S6) is grounded.

Both terminals of the resistor (11) are connected to the input terminal of an amplifier (28), the output of the amplifier (28) is connected to one input terminal of the comparator (12), and the output of the amplifier (28) is connected to one input terminal of the comparator (12). The input terminal is grounded. The output of the comparator (12) is [
ISE/UNUSE signal is output.

With the above configuration, from the voltage source 10 Vcc to the resistor (11) → the first
connection (7) → relay code TC → second connection (
6) → Disposable pressure transducer (1a) → Second connector (6) → First connector (7) → Current flows through the pressure transducer (1a) through the path of ground, and then flows through the resistor (11). A detection means (30) is configured to detect the USB/UNLISB signal by detecting the current with the amplifier (28) and then determining the level with the comparator (12).

FIG. 2 shows an example of a circuit of such a current detection type connection state detection device. Components corresponding to those in FIG. 1 are given the same reference numerals and redundant explanation will be omitted.

Both terminals of the resistor (11) are connected to the inverting and non-inverting input terminals of the amplifier (28) via resistors (17) and (18), and the resistor (18> and the non-inverting input terminal of the amplifier (28) One end of a resistor (39) is connected between the connections, and the other end is grounded.Furthermore, a feedback resistor (19) is connected to the output end and the inverting input end of the amplifier (28). The output of the amplifier (28) is connected to the inverting input terminal of the comparator (12), and the non-inverting input terminal is connected to the +5V power supply.

Furthermore, one end of the resistor (11) constituting the detection element is connected to the common emitter of the driving transistors (14) (15), and the collectors of each of the driving transistors (14) (15) are supplied with voltages of +8V and -8V. is applied, and their bases are commonly connected to the output terminal of the amplifier (16). +5 to the non-inverting input terminal of the amplifier (16)
V voltage is supplied, and the inverting input terminal is connected to a feedback resistor <1
3), the voltage output to the first connector (7) is maintained at +5V.

The operation of this configuration is exactly the same as that shown in Fig. 1, in which the current that drives the disposable pressure transducer via the relay cord TC is detected by the resistor (11) with a small resistance value, and after being amplified by the amplifier (28), the comparator ( 12) performs a level judgment, and the output of the voltage source +5V is kept constant by the drive transistors (14) (15), the amplifier (16), and the feedback resistor (13).

According to this configuration, the first and second connectors (7) (6
) is attached or detached, the fitted state can be detected correctly.

In the above embodiment, the current flowing through the disposable pressure transducer (1a) is detected by the detection element (11).
The figure shows a circuit diagram of a voltage detection type connection state detection device.

In Fig. 3, the fifth connector (7SS) of the first connector (7) is connected to the +5V power supply, and the sixth connector (7S6) is connected to the resistor (7S6) that constitutes the detection element. 20) is connected to the collector of the driving transistor (22), and further connected to the connection point 8 to which the human power terminal of the puffer IC (24) is connected.

The resistance value of the resistor (20) is selected to be about 100KΩ, and the other end is grounded. The emitter of the driving transistor (22) is grounded, and the base is connected to a bias resistor (23).
A drive waveform signal DP is supplied via the drive waveform signal DP.

The output end of the buffer IC (24) is connected to one end of the resistor (25), and the other end of the resistor (25) is connected to the capacitor (28).
) and resistor (26), connected to capacitor (28)
One end of is grounded. The resistor (25) and capacitor (28) constitute a low-pass filter, and the resistor (26)
One end is connected to the buffer IC (27) and the Huffer I
C (27) protection resistor, and this output has [ISE
/UNUSB signal is extracted.

Generally, the standard impedance of a pressure transducer (la') or a disposable pressure transducer (1a) is 300Ω, and the
and 4 at one end point A of the resistor (20) which becomes a voltage detection element when the second connector (7) (6) is fitted. 9
The same voltage as the 8 V drive waveform signal is generated, and the bus sofa I
C (24) → Low-pass filter (25) (28) →
The voltage obtained through (27) is I-
The voltage becomes I level and the IIsIE signal is output.

Furthermore, when the disposable pressure transducer (1a) and the second connector (6) or the first connector (7) are not connected, the potential at the Δ point is at L level and the buffer rC (
27) also goes to L level [INtlSE signal is output, and the first and second connectors (7) (
6) can detect the attachment/detachment state.

FIG. 4 shows still another embodiment of the present invention. In the examples shown in Figures 2 and 3, the current or voltage consumed by the pressure transducers (1a) (la') is detected, but in the case of Figure 4, a signal is actively generated and injected, and this signal The circuit is designed to detect the presence or absence of a signal, and a signal generating means (37) and a separation detecting means (38) shown by broken lines are added to the circuit shown in FIG.

That is, the AC signal source (32) is connected via the resistor (31) to the connection point B that connects one of the feedback resistors (13) and the inverting input terminal of the amplifier (16).
A signal generating means (37) whose one end is grounded is connected. Further, the fifth socket contact (7SS) is connected to the common emitter of the driving transistors (14) (15) and one end of the feedback resistor (13), and is also connected to the capacitor (
29) and the inverting input terminal of an amplifier (28) via a resistor (33), the non-inverting input terminal of the amplifier (28) is grounded, and its output is connected to a diode (34) for separating the alternating current component. and resistor (35) and capacitor (36)
connected to a separation detection means (38) consisting of a comparator (1
The non-inverting input terminal of 2) connects the +V voltage to the resistor (40) and (
39), the divided voltage is supplied.

The operating frequency of the AC signal source (32) is the same as that of the pressure transducer (1a) (
For example, several hundred to several kIf outside the operating frequency range of la')
z, drive power supply +5V by resistor (31)
The injected AC voltage superimposed on the is adjusted. This injected AC voltage is selected to be so small that it does not affect the pressure transducers (la) (la'). This injected AC voltage is outputted to the comparator (12) via the separation detection means (38) depending on whether the first and second connectors (7) (6) are attached or detached. In this case as well, it is possible to detect the attachment and detachment states of the first and second connectors.

The present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the gist of the invention.

〔Effect of the invention〕

According to the connection state detection device of the present invention, even if the first and second connectors are connected in series, it is possible to detect the attachment/detachment state of the first and second connectors. Furthermore, it is possible to detect not only the attachment/detachment of the first and second connectors but also the attachment/detachment of any connector part before the amplifier cord even when multiple connectors are joined. I can do it. Furthermore, there is an effect that the connection state can be detected while maintaining compatibility with the conventional one without making any changes to the disposable pressure transducer, the second connector, or the relay cord, which require compatibility.

[Brief explanation of drawings]

Fig. 1 is a principle configuration diagram of the connection state detection device of the present invention;
The figure shows an example of the connection state detection device of the present invention) j′j! 3 and 4 are circuit diagrams showing other embodiments of the connection state detection device of the present invention, FIG. 5 is a system diagram showing a conventional polygraph, and FIG. 6 is a circuit diagram showing a conventional polygraph. FIG. 7, which is an explanatory diagram of the connection state between the converter and the measuring device, is a conventional connection detection configuration diagram. (1) is the electrode converter relay unit, (2) is the amplifier/waveform processing unit, (3) is the main amplifier, (4) is the display/recording device, (5) is the measurement means, and (6) is the second connector. ,(
7) is a first connector, and (30) is a detection means. Agent Hidemori Matsukuma

Claims (1)

[Scope of Claims] A converting means for detecting biological information, a connecting means for connecting the converting means and the measuring means, and a detecting means for detecting the current or applied voltage flowing through the converting means. . A connection state detection device, characterized in that the connection state of the connection means is detected by the output of the detection means.