JPH0234882Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a method for detecting respiratory air heat by placing a heat-sensitive element facing the nasal cavity and oral cavity, and monitoring the detection signal with a recorder or cathode ray tube. It is related to sensors.

[Problems that conventional technology and ideas try to solve]

Conventional respiratory sensors of this type detect respiratory heat at one location and supply a detection signal to the monitor through an associated lead wire. Therefore, in order to more reliably monitor the patient's breathing air, when respiratory sensors are set at multiple locations in both nasal cavities and oral cavity, the corresponding number of lead wires are drawn out, and the monitor side also detects each sensor. The signal waveforms were displayed and monitored in parallel. For example, when monitoring both the nasal cavity and the oral cavity, six lead wires are usually led out, and the monitor side also requires three channels.

Therefore, an object of the present invention is to provide a breathing sensor that can monitor breathing air at three locations, both nasal cavities and oral cavity, and that also simplifies the structure of the sensor itself and the monitoring device.

[Means for solving problems]

In order to achieve this objective, the present invention integrally forms a heat-sensitive element holder with a surface that contacts the median part of the upper lip, a portion that faces both nasal cavities, and a portion that faces the oral cavity. . A plurality of heat-sensitive elements connected to each other so as to output a composite signal of the respective respiratory detection signals were attached to each facing portion, and a lead wire for transmitting the composite signal was led out from the holder.

As a generating circuit for the respiratory gas synthesis signal, at least three thermistors are connected in parallel, or in series or series-parallel, or at least three thermocouples are connected in series. In addition, various heat sensitive elements or their composite signal generating circuits are conceivable.

[Effect]

When monitoring, place the contact surface of the holder on the midline of the upper lip, secure it with an adhesive band, etc. from above, and place the heat-sensitive element on at least one part of the left and right nasal cavities and oral cavity.
Have them face to face. Each heat-sensitive element outputs a detection signal of a level corresponding to the temperature of the respective atmosphere, and a composite signal is sent out from the lead wire. Therefore, on the monitor side, the composite signal of respiratory gas is monitored using one channel. In other words, even if one of the nasal passages becomes clogged or all or part of the mouth is closed, and the heat-sensitive element facing it no longer detects breathing air, the detection signal from the remaining heat-sensitive element will respond. The signal is monitored on one channel.

[Example of idea]

In FIG. 1, reference numeral 10 denotes a holder made of a one-piece plastic plate, which has a flat triangular contact surface 11 with the upper lip median portion 1, and a right angle direction on both sides of the upper end of this contact surface 11. Portions 12, 12a facing the nasal cavities 2, 2a formed by bending
The contact surface 11 is integrally formed with a portion 13 facing the oral cavity 3 in a strip shape extending slightly upwardly from the lower end of the contact surface 11 . The shape of the holder 10 is such that when the contact surface 11 is applied to the middle part of the upper lip so that both the facing parts 12, 12a face the nasal cavities 2, 2a with an appropriate distance, the facing part 13 extends downward from the upper lip. It is designed to be able to face the oral cavity 3. Thermistors 14, 14 are provided as heat-sensitive elements on the front surface of the facing portions 12, 12a and the lower surface of the facing portion 13, respectively.
a, 15 is attached.

These thermistors, as shown in Figure 3,
The two lead wires 18 and 18a are connected in parallel to each other so as to synthesize their respective output signals to form a composite signal generation circuit.

For such interconnection, thermistor 1
4, 14a, 15 lead wires are facing parts 12, 1
Holes 12b, 12c on 2a and hole 1 on raised surface 13a
Interconnection is made through 3b. These lead wires are fixed to the holder 10 with an adhesive and a molding material, and are provided with raised portions 16, 16a and 17, respectively.
is formed. Further, lead wires 18 and 18a for outputting a composite signal are led out from the side of the holder 10, and a thermistor 14,
14a and 15 are supplied with power. This bridge circuit sends to the plug 21 an unbalanced voltage corresponding to the combined value of the resistance changes of these thermistors.

When monitoring the patient's breathing, the facing portion 12,
12a are placed slightly apart from the nasal cavities 2 and 2a to face each other, and the contact surface 11 is applied to the midline of the upper lip and fixed thereon with, for example, adhesive tape. In this state, the facing portion 13 extends downward from the upper lip, and when the mouth is open, the thermistor 15 faces the oral cavity 3. When breathing air comes into contact with the thermistors 14, 14a, and 15, the resistance value changes in accordance with changes in the temperature of the exhaled and inhaled air. As a result, a voltage signal corresponding to breathing air is output from the plug 21, and is monitored as a one-channel waveform in a recording device such as an electroencephalogram or a cathode ray tube. Even if only one of the thermistors 14, 14a, and 15 detects breathing air, the level of the detection signal becomes relatively small, and the patient's breathing can be reliably checked.

FIG. 4 shows thermocouples 24, 24 as heat-sensitive elements.
Fig. 3 shows a composite signal generation circuit when using a, 25. In this case, a bias voltage is not necessary because the power is generated by itself, and therefore the case 22 shown in FIG. 3 is either eliminated or a preamplifier is built in.

In addition, various heat sensitive elements can be used,
Although the shape of the holder in the above-described embodiment was designed to be as light and compact as possible by omitting unnecessary parts, various shapes can be considered within the scope of the present invention. For example, two or more heat-sensitive elements may be placed along the lip anastomosis so that even breathing air from a small opening in the oral cavity can be detected.

[Effect of idea]

As described above, the respiratory sensor of the present invention not only increases the reliability of the monitor because it detects respiratory waves in multiple left and right nasal cavities and oral cavity, but also is small and lightweight.
Moreover, the lead wires are not bulky and monitoring becomes easy.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a state in which a breathing sensor according to an embodiment of the present invention is attached, Fig. 2 is a side view of the breathing sensor, Fig. 3 is a diagram showing a state in which the heat-sensitive element is connected, and Fig. 4 is a separate view. FIG. 1... upper lip midline, 2, 2a... nasal cavity, 3...
oral cavity, 10... holder, 11... contact surface, 12,
12a... Part facing the nasal cavity, 13... Part facing the oral cavity, 14, 14a, 15... Thermistor, 2
4, 24a, 25... thermocouple.

Claims (1)

[Scope of utility model registration request] A heat-sensitive element holder is integrally formed having a contact surface to the midline portion of the upper lip, a portion facing both nasal cavities, and a portion facing the oral cavity, and detects respiratory air heat at each of the facing portions at the plurality of locations. and at least three heat-sensitive elements connected to each other so as to output a composite signal of the detection signals, and a lead wire for transmitting the composite signal is led out from the holder.