JP2012210392A - Device for measuring brain retraction pressure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a device for measuring brain retraction pressure which can directly measure the retraction pressure, can also secure a visual field and a space, while maintaining the same shape and size of a conventional cerebral spatula, and moreover dispenses with correction due to the effect of heat.SOLUTION: The device for measuring the brain retraction pressure includes a cerebral spatula with a pressure sensor which is formed by embedding/adhereing a film-like pressure sensor of about 0.2 mm thick in/to a groove cut in one side of the cerebral spatula and having the thickness and the shape of the pressure sensor, and a measuring device which is equipped with a display unit provided for calculating the retraction pressure from a signal coming from the pressure sensor and being converted and for displaying the retraction pressure by a monitor, an alarm unit giving an alarm when this pressure exceeds the one set beforehand, a memory for storing measuring data on the retraction pressure, etc.

Description

  When performing brain surgery, the present invention measures and displays the relieved pressure when the brain tissue is relieved with a brain spatula, and issues an alarm when a pre-set relieved pressure is exceeded. The present invention relates to an apparatus for measuring cerebral pressure excretion.

  Conventionally, when performing surgery on a brain affected part by brain surgery, a hole is made in the skull, and the surgery is performed through the hole. In the surgery, when the affected part is in the deep part of the brain, the brain tissue is removed using a brain spatula to facilitate the operation, and the visual field and space are secured. In this case, complications such as cerebral edema and cerebral contusion may occur if the brain tissue is squeezed for a long time or overstressed.

  In many cases, the extruding pressure of the brain tissue by the above-mentioned brain spatula is left to the operator's experience, but an apparatus capable of quantifying the excluding pressure and displaying it on a monitor has been developed. For example, in Japanese Patent Laid-Open No. 09-103435, “Invention Name: Brain Vera Fixation Device”, a strain gauge is fixed to a brain spatula, a signal output from the strain gauge is input to a transducer, and is excluded to a monitor in a microscope. An apparatus for displaying pressure numerically is described. Although the position where the strain gauge is fixed is not particularly specified, it is determined from the figure that it is behind the center of the brain spatula. In addition, in "Title of pressure-receiving portion for measuring brain pressure" in Japanese Patent Application Laid-Open No. 09-327441, a bag made of a thin, flexible, non-stretchable material is fixed to the tip of the brain spatula with a belt, It is described that a tube piped in a bag is connected to a pressure gauge, and the air pressure enclosed in the bag is measured and displayed as an exhaust pressure.

JP 09-103435 A JP 09-327441 A

  However, since the device described in Japanese Patent Application Laid-Open No. 09-103435 has a strain gauge fixing position behind the center of the brain spatula, it merely measures the strain pressure applied to the entire brain spatula. There was a drawback that it was not possible to directly measure the exclusion pressure of brain tissue. Since the strain gauge is a sensor that measures the strain pressure on the sensor itself, it does not generate distortion even if it is placed at the tip of the brain spatula that contacts the brain tissue and pressed, and accurate measurement is not possible. there were.

  In addition, in Japanese Patent Laid-Open No. 09-327441, although the sensor can be placed on the tip of the brain spatula in contact with the brain tissue in order to solve the above drawbacks, the pressure exclusion pressure can be directly measured, but the sensor itself encloses air. Due to the thickness of the bag, there is a fatal drawback that the thickness and the securing of the field of view and space are hindered. In addition, since a tube that transmits air pressure to the pressure gauge is connected to the bag, there is a disadvantage that the tube becomes an obstacle during the operation, and a correction is necessary because it is affected by heat. .

  The present invention has been made to solve the above-mentioned various drawbacks. When performing brain surgery, it is possible to directly measure the retraction pressure when excluding a brain tissue with a brain spatula. An object of the present invention is to provide a cerebral pressure relief measuring device that can maintain the same shape and size as a cerebral spatula while ensuring a visual field and a space, and that does not require correction due to the influence of heat.

  In order to solve the above problems, a brain pressure relief measuring device according to the present invention has a film-like pressure sensor having a thickness of about 0.2 mm and a groove having the thickness and shape of the pressure sensor on one side of the brain spatula. A brain spatula with a pressure sensor formed by cutting and embedding and bonding, a display for converting the signal output from the pressure sensor to calculate a pressure relief pressure, and displaying the pressure relief pressure on a monitor, and a preset An alarm device that issues an alarm when the pressure exhaust pressure is exceeded, and a measuring device that includes a memory or the like for storing measurement data of the pressure exhaust pressure.

  The pressure sensor is composed of two layers of upper and lower thin films. An electrode is provided on the surface of the front end of each film, and a conductive wire connected to the electrode is extended to the rear end, and the electrodes are opposed to each other. And laminating a pressure sensitive material between the electrodes, and providing a connector at the end of the conducting wire.

  If brain surgery is performed using the brain pressure displacement measuring device of the present invention, the pressure when the brain tissue is removed with a brain spatula can be directly and accurately measured with a brain spatula with a pressure sensor. There is an effect. In addition, the pressure-sensitive sensor-equipped brain spatula has the same shape and size as a conventional brain spatula, and thus has an effect that a sufficient field of view and space can be secured. Furthermore, since correction due to the influence of heat is unnecessary, there is an effect that measurement is easy.

  The best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a circuit block diagram of a measuring apparatus constituting a cerebral pressure excretion measuring apparatus of the present invention and a connection diagram with a pressure-sensitive sensor equipped brain spatula. As shown in the figure, the brain pressure relief measuring device of the present invention connects the connector 8 at the rear end of the brain spatula 1 with pressure sensor to the signal input connector 9 connected to the measuring device 10. Configure. The two pressure-sensitive sensor-equipped brain spats 1 are normally used in order to exclude the brain tissue in the opposite direction in order to secure the visual field and space of the brain stem. When performing actual surgery, the pressure-sensitive sensor-equipped brain spatula 1 is held in advance by a “brain spatula fixing device” described in JP-A-2002-345825, filed by one of the applicants of the present application. It is necessary to keep.

  The measurement apparatus 10 includes an AMP unit 11 for inputting an analog signal output from the pressure sensor 3 in the brain spatula 1 with a pressure sensor and performing signal processing, and an analog signal output from the AMP unit 11. A / D converter 12 for converting the digital signal into a digital signal, a CPU 13 for calculating the pressure relief pressure by scaling the digital signal or controlling each circuit block in the measuring apparatus 10, and the pressure relief pressure Monitor control unit 15 and LCD monitor 16 for monitor display, alarm control unit 17 and buzzer 18 for issuing an alarm when preset pressure relief pressure is exceeded, storage and control program for measurement data of the pressure relief pressure Is constituted by a memory unit 14 for storing the power supply, a power supply unit 19 for supplying circuit power to the respective circuit blocks, and the like.

  The LCD monitor 16 can display various types of information such as the pressure relief time, alarm set value, patient name, and disease name in addition to the pressure relief display, and an LED or an organic EL may be used as a display. . In addition to the general magnetic buzzer, the buzzer 18 may use a piezoelectric buzzer or a speaker as an alarm device. Furthermore, if a memory such as a USB memory or an SD card is used for storing measurement data in the memory unit 14, data can be aggregated by replacing with a personal computer after the measurement is completed. In addition, although a commercial power supply is normally connected to the power supply part 19, in the case of carrying etc., a battery drive may be sufficient.

  Next, FIG. 2 is an outline view of a pressure sensor used in a brain spatula with a pressure sensor, where (a) is a plan view and (b) is a side view. As shown in the figure, the pressure-sensitive sensor 3 is composed of two upper and lower elongated films 5, and an electrode 6 is provided on the front surface of each film 5, and a conductive wire 7 connected to the electrode 6 is connected to the rear end. The electrodes 6 are opposed to each other, and a pressure-sensitive material (not shown) is sandwiched between the electrodes, laminated into a film having a thickness of about 0.2 mm, and the end of the conductor 7 The connector 8 is provided in the part.

  The pressure-sensitive material is arbitrary, such as a material whose resistance value changes when a pressing force is applied between the two layers of electrodes 6, and a material whose capacitance changes, and is not particularly limited.

  Next, FIG. 3 is an outline view of a brain spatula body used for a brain spatula with a pressure sensor, wherein (a) is a plan view and (b) is a cross-sectional side view taken along line AA in (a). As shown in the figure, the pressure-sensitive sensor-equipped brain spatula 1 cuts a groove 4 having the thickness and shape of the pressure-sensitive sensor 3 to be embedded on one surface of a conventional brain spatula 2, and the groove 4 has the above-described structure. The pressure sensitive sensor 3 is adhered and configured. Since the brain spatula 2 is bent into a shape that holds the brain tissue at the time of exclusion, the film 5 and the conductive wire 7 constituting the pressure sensor 3 can be bent together with the brain spatula 2.

  FIG. 4 is an external view of a brain spatula with a pressure-sensitive sensor that constitutes the brain pressure excretion measuring device of the present invention configured as described above. The shape of the brain spatula 2 is not limited to the shape shown in the figure, and any shape may be used, such as a taper that narrows toward the distal end that is often used in brain surgery. At this time, the shape of the pressure-sensitive sensor 3 may be changed according to the shape of the brain spatula to be used.

  Next, FIG. 5 is a state diagram in which the frontal lobe tissue and temporal lobe tissue of the brain model are excluded using the brain spatula with pressure-sensitive sensor that constitutes the brain pressure excretion measuring device of the present invention. As shown in the drawing, the frontal lobe tissue model 21 and the temporal lobe tissue model 22 in the brain model 20 are bent so that the frontal lobe tissue-equipped brain spatula 1 is easily bent, The entire surface of the electrode 6 of the pressure-sensitive sensor 3 embedded in the attached spatula 1 is brought into contact with the brain tissue so as to be removed. In the actual operation, exclusion is similarly performed.

  FIG. 6 shows the frontal lobe measurement data of the brain model measured by the brain pressure excretion measuring apparatus of the present invention, and FIG. 7 shows the temporal lobe measurement data of the brain model measured by the brain pressure excretion measuring apparatus of the present invention. Both figures are graphs obtained by measuring the pressing force when the frontal lobe tissue model 21 and the temporal lobe tissue model 22 are squeezed out with the pressure-sensitive sensor-equipped brain spatula 1 in the state shown in FIG. In model 21, the pressure of about 21 mmHg is kept constant about 5 minutes after the start of measurement, and in the temporal lobe tissue model 22, the pressure of about 31 mmHg is kept constant about 5 minutes after the start of measurement. Can be determined.

  As described above, the displacement pressure when the brain tissue is displaced with the brain spatula can be directly measured by the entire surface of the electrode 6 of the pressure sensor 3 embedded in the brain spatula 1 with the pressure sensor. Can be measured. In addition, the pressure-sensitive sensor-equipped brain spatula 1 can ensure a sufficient field of view and space because of the same shape and size as a conventional brain spatula. Furthermore, since the pressure-sensitive material sandwiched between the electrodes 6 of the pressure-sensitive sensor 3 is not affected by heat, correction is unnecessary and measurement is easy.

It is a circuit block diagram of a measuring device which constitutes a cerebral pressure excretion measuring device of the present invention, and a connection diagram with a brain spatula with a pressure sensor. It is an external view of the pressure sensor used for a brain spatula with a pressure sensor. It is an external view of the brain spatula main body used for a brain spatula with a pressure-sensitive sensor. It is an external view of the brain spatula with a pressure sensor which comprises the brain pressure excretion measuring apparatus of this invention. It is a state figure which is excluding the frontal lobe tissue and the temporal lobe tissue of a brain model using the brain spatula with a pressure sensor which constitutes the brain pressure excretion measuring device of the present invention. It is the frontal lobe measurement data of the brain model measured with the brain pressure excretion measuring device of the present invention. It is the temporal lobe measurement data of the brain model measured with the brain pressure excretion measuring device of the present invention.

DESCRIPTION OF SYMBOLS 1 Brain spatula with pressure sensor 2 Brain spatula 3 Pressure sensor 4 Groove 5 Film 6 Electrode 7 Conductor 8 Connector 9 Connector 10 Measuring apparatus 11 AMP part 12 A / D conversion part 13 CPU
DESCRIPTION OF SYMBOLS 14 Memory part 15 Monitor control part 16 LCD monitor 17 Alarm control part 18 Buzzer 19 Power supply part 20 Brain model 21 Frontal lobe tissue model 22 Temporal lobe tissue model

Claims (2)

  A pressure sensor in the form of a film having a thickness of about 0.2 mm and a brain spatula with a pressure sensor formed by embedding and bonding a groove having the thickness and shape of the pressure sensor to one side of the brain spatula; Converting the signal output from the pressure-sensitive sensor to calculate a pressure relief pressure and displaying the pressure relief pressure on a monitor; an alarm device for issuing an alarm when a preset pressure relief pressure is exceeded; and the pressure relief A cerebral pressure relief measuring device comprising a measuring device having a memory or the like for storing pressure measurement data.   The pressure-sensitive sensor is composed of two layers of upper and lower thin films. An electrode is provided on the front surface of each film, and a conductive wire connected to the electrode is extended to the rear end, and the electrodes are opposed to each other. The apparatus for measuring brain pressure relief according to claim 1, wherein a pressure sensitive material is sandwiched between the electrodes and laminated, and a connector is provided at an end of the conducting wire.

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