JP4898885B2 - UV therapy device - Google Patents

Description

  The present invention relates to an ultraviolet treatment device that irradiates ultraviolet rays for the treatment of skin diseases.

  As a treatment method for skin diseases, ultraviolet irradiation is widely performed. There are two types of ultraviolet treatment methods: a method of simply irradiating the skin with ultraviolet light, and a puvalen (ultraviolet a therapy) therapy in which UVA is irradiated after psoralen derivatives such as methoxalene are administered to the living body. . In both treatment methods, it is necessary to set the irradiation dose appropriately for the treatment effect, prevention of burns, and prevention of carcinogenesis. The minimum dose that causes erythema to occur in patients with ultraviolet rays is referred to as MED or MPD, which is the standard for the dose during treatment.

Since MED and MPD have individual differences depending on patients, it is necessary to examine them prior to treatment. For measurement of MED and MPD, a perforated plate is often used. The perforated plate typically has 10 window holes that can be opened and closed individually. The perforated plate is attached to the subject in a fully opened state and irradiated with ultraviolet rays. From the time of irradiation with ultraviolet rays, the window holes are closed one by one at an arbitrary time interval such as one minute interval. As a result, 10 erythema with different irradiation times appear on the skin. The irradiation energy (J / cm ² ) obtained by multiplying the irradiation time corresponding to the specific erythema by the ultraviolet power inherent or pre-measured for the lamp used is set as 1 MED.

However, in such a measuring method, the correspondence between erythema and irradiation time is intuitively understood, but the relationship between erythema and irradiation energy is not intuitive because multiplication of irradiation time and ultraviolet power intervenes. In addition, as the ultraviolet power value, an eigenvalue or a pre-measured value of the lamp used is used, but the ultraviolet power fluctuates with time from the lighting of the lamp used, and the calculated irradiation energy (J / cm ² ) is Not necessarily accurate.

Japanese Patent Laid-Open No. 9-10334 Japanese Patent Laid-Open No. 9-10335

  An object of the present invention is to provide an ultraviolet treatment device capable of accurately and intuitively measuring MED and MPD.

  One aspect of the present invention is a perforated plate having an ultraviolet lamp that generates ultraviolet rays on a subject, and a plurality of individually openable and closable window holes for irradiating the subject with ultraviolet rays generated by the ultraviolet lamp. An ultraviolet power measuring unit that repeatedly measures the ultraviolet power, a distance measuring unit that measures a distance from the ultraviolet lamp to the subject, the measured ultraviolet power, the measured distance, and an irradiation time. The irradiation energy calculation unit that calculates the irradiation energy based on the above and the calculated irradiation energy are sequentially compared with each of a plurality of target energies having different values, and the calculated irradiation energy reaches each of the target energies. A specific signal output unit for outputting a specific signal every time, and a perforated plate mounted on the subject each time the specific signal is output. A perforated plate control unit that outputs a signal for sequentially closing a plurality of window holes to the perforated plate, and a plurality of window hole marks in the same arrangement as the arrangement of the plurality of window holes of the perforated plate, The numerical value of the target energy of each of the plurality of window holes and the number indicating the order of closing the window holes are displayed together with the plurality of window hole marks, and the same order as the order of closing the window holes each time the specific signal is output. And a display unit for changing the display mode of the plurality of window hole marks.

  According to the present invention, MED and MPD can be accurately and intuitively measured.

It is a figure which shows the structure of the principal part of the ultraviolet treatment device which concerns on embodiment of this invention. It is an external view of the lamp house and bed of FIG. It is a figure which shows the external appearance of the perforated panel of FIG. It is a flowchart which shows the MED measurement operation | movement procedure by this embodiment. In this embodiment, it is a figure which shows the time change of ultraviolet power, and the timing which a window hole closes. It is a figure which shows the example of a display screen of S21 of FIG. In this embodiment, it is a figure which shows the difference example of the erythema by the difference in irradiation energy.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the ultraviolet treatment device according to the present embodiment includes a lamp house 1 and a device main body 2. As shown in FIG. 2, the lamp house 1 is supported by the stand 14 so as to face the patient 5 on the bed 4. The lamp house 1 houses an ultraviolet lamp 11, an ultraviolet sensor 12, and a distance sensor 13. The ultraviolet sensor 12 is provided to output a signal corresponding to the intensity of ultraviolet rays generated by the ultraviolet lamp 11. The distance sensor 13 is provided to output a signal corresponding to the distance from the ultraviolet lamp 11 to the patient.

  The apparatus main body 2 includes a lamp control unit 21 and a timer 24. The lamp control unit 21 supplies power to the ultraviolet lamp 11. The timer 24 is triggered by power supply from the lamp control unit 21 to the ultraviolet lamp 11 as a trigger. That is, the timer 24 is provided for measuring the elapsed time from the lighting of the ultraviolet lamp 11, that is, the ultraviolet irradiation time.

  In addition, the apparatus main body 2 includes an ultraviolet measurement unit 22, a distance measurement unit 23, and an ultraviolet power calculation unit 25. The ultraviolet ray measurement unit 22 measures the intensity of ultraviolet rays based on the output of the ultraviolet sensor 12. The distance measuring unit 23 measures the distance from the ultraviolet lamp 11 to the patient based on the output of the distance sensor 13. The ultraviolet power calculation unit 25 calculates the illuminance (ultraviolet power) on the patient surface based on the intensity of ultraviolet rays measured by the ultraviolet measurement unit 22 and the distance from the ultraviolet lamp 11 measured by the distance sensor 13 to the patient. calculate.

  The apparatus body 2 includes an irradiation energy calculation unit 26, an energy comparison unit 27, an opening / closing control unit, and a display unit 29. The irradiation energy calculation unit 26 calculates irradiation energy by multiplying the ultraviolet power calculated by the ultraviolet power calculation unit 25 by the irradiation time by the timer 24. The energy comparison unit 27 compares the irradiation energy calculated by the irradiation energy calculation unit 26 with a plurality of target energies, and outputs a specific signal every time the irradiation energy reaches each of the plurality of target energies. The open / close control unit 28 outputs a signal for sequentially closing the window holes 31 of the porous plate 3 shown in FIG. 3 attached to the patient to the porous plate 3 every time a signal is output from the energy comparison unit 27. . The perforated plate 3 is typically provided with a total of 10 window holes 31 in 2 rows × 5. The order of closing the ten window holes 31 is determined in advance. Each time a signal is received from the opening / closing control unit 28, the ten window holes 31 are closed one by one in order. As illustrated in FIG. 6, the display unit 29 displays a plurality of window hole marks 32 arranged to imitate the arrangement of the window holes 31 of the perforated plate 3. A corresponding target energy value 33 is displayed adjacent to each window hole mark 32. Each time the display unit 29 receives a signal from the opening / closing control unit 28, the display unit 29 changes the display mode of the plurality of window hole marks 32 to, for example, black and white inversion display according to a predetermined closing order.

FIG. 4 shows the procedure of the MED measurement operation according to the present embodiment. FIG. 5 shows the time change of the ultraviolet power. MED measurement is performed by each part operating under the control of a MED measurement control unit (not shown). First, when an activation of the MED measurement program is instructed from the main menu, the MED measurement program is activated, and a screen for MED measurement illustrated in FIG. 6 is displayed on the display unit 29 (S11). On this screen, the measured distance and the measured illuminance are displayed together with ten window hole marks 32 arranged in a manner similar to the arrangement of the window holes 31 of the perforated plate 3 and the respective target energy 33. The numbers in the window hole mark 32 indicate the closing order. The target energy 33 is displayed in units (J / cm ² ). The target energy 33 is set to an arbitrary value by an operator operating an operation unit such as a mouse or a keyboard (not shown) and inputting a numerical value or selecting from a pull-down menu. The plurality of target energies 33 are initially set at a constant energy interval, that is, 0.3 (J / cm ² ) in FIG. Can be set. For convenience of explanation, it is assumed that the plurality of target energies 33 are set at intervals of 0.3 (J / cm ² ).

  When the setting of the target energy is completed and the “start” button in the screen is clicked, power supply from the lamp control unit 21 to the ultraviolet lamp 11 is started, and irradiation of ultraviolet rays to the patient is started (S12). The timer 24 starts with the power supply (S13). Of the target energy set for each of the ten window holes, the first target energy, that is, the lowest target energy value is set in the energy comparison unit 27.

The ultraviolet light intensity is measured by the ultraviolet light measuring unit 22 (S14), and the distance from the ultraviolet lamp 11 to the patient is measured by the distance sensor 13 (S15). The ultraviolet power (illuminance) on the patient surface is calculated by the ultraviolet power calculation unit 25 based on the intensity of the ultraviolet rays measured by the ultraviolet measurement unit 22 and the distance from the ultraviolet lamp 11 measured by the distance sensor 13 to the patient. Calculated (S16). The calculated ultraviolet power (illuminance) is time integrated in the irradiation energy calculation unit 26 according to the time of the timer 24. Thereby, the irradiation energy is calculated (S17). The calculated irradiation energy is compared with the first target energy (0.3 J / cm ² ) in the energy comparison unit 27 (S18). When the irradiation energy does not reach the target energy, the process returns to S14, and the processes of S14 to S18 are repeated until the irradiation energy reaches the first target energy.

  When the irradiation energy reaches the first target energy, the energy comparison unit 27 generates a specific signal. Thereby, the first window hole 31 is closed by the control of the opening / closing control unit 28 (S19), and the mark 32 corresponding to the first window hole 31 is reversed in black and white as shown in FIG. 6 (S20). If all the window holes 31 are not closed (S21), the second target energy is set in the energy comparison unit 27 (S22). Similarly, the processes in S14 to S18 are repeated until the irradiation energy reaches the second target energy.

When the irradiation energy reaches the second target energy (0.6 J / cm ² ), the energy comparison unit 27 generates a specific signal. As a result, the second window hole 31 is closed under the control of the opening / closing control unit 28 (S19), and the mark 32 corresponding to the second window hole 31 is reversed in black and white (S20).

By repeating such an operation, the plurality of window holes 31 are sequentially closed each time the irradiation energy reaches the set target energy. In the example of FIG. 6, since setting the interval of the target energy 0.3 J / cm ^2, window holes 31 is gradually closed one by one every time the irradiation energy 0.3 J / cm ² increases. When all the window holes 31 are closed (S21), the MED measurement operation is completed together with the stop of ultraviolet irradiation (S23).

  The operator selects a specific erythema from 10 erythema having different irradiation energies shown in FIG. 7, and sets the irradiation energy corresponding to the erythema as 1 MED, either numerical input or a plurality of window hole marks 32. Click to select and input to the device.

  As described above, according to the present embodiment, instead of measuring the MED by irradiating the patient with ultraviolet rays while changing the irradiation time for each window hole as in the prior art, the patient is irradiated with ultraviolet rays while changing the irradiation energy for each window hole. As shown in FIG. 7, the correspondence between erythema and irradiation energy can be intuitively understood. Conventionally, the correspondence between erythema and irradiation time is intuitively understood, but in order to obtain the correspondence between erythema and irradiation energy, it is not intuitively understood because multiplication of ultraviolet energy is required. Actually, in order to input 1 MED to the apparatus, conventionally, it is necessary to select a specific erythema from 10 erythema and multiply the irradiation time corresponding to the erythema by the ultraviolet power specific to the lamp. It was done. However, in this embodiment, a specific erythema is selected from 10 erythema, and the irradiation energy itself corresponding to the erythema already represents 1 MED. Therefore, it is possible to directly grasp the irradiation energy corresponding to 1 MED.

  Conventionally, the irradiation energy is obtained by simply multiplying the irradiation time by the ultraviolet power as a fixed value specific to the prior measurement or the apparatus. However, as shown in FIG. 5, the ultraviolet lamp 11 typically has a characteristic that the luminous intensity rises sharply immediately after lighting and then gradually approaches the eigenvalue. Therefore, the measurement accuracy of irradiation energy is low. On the other hand, in this embodiment, since irradiation energy is calculated | required by time-integrating the ultraviolet power measured at any time, more exact irradiation energy can be calculated | required.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  The present invention can be used in the field of ultraviolet treatment devices that require accurate and intuitive measurement of MED and MPD.

  DESCRIPTION OF SYMBOLS 1 ... Lamp house, 2 ... Computer unit, 3 ... Perforated plate, 4 ... Bed, 5 ... Subject, 11 ... Ultraviolet lamp, 12 ... Ultraviolet sensor, 13 ... Distance sensor, 21 ... Lamp control part, 22 ... Ultraviolet measurement part , 23 ... Distance measuring section, 24 ... Timer, 25 ... Ultraviolet power calculating section, 26 ... Irradiation energy calculating section, 27 ... Energy comparing section, 28 ... Opening / closing control section, 29 ... Display section.

Claims (2)

An ultraviolet lamp that generates ultraviolet rays on the subject;
A perforated plate having a plurality of individually openable and closable window holes for irradiating the subject with ultraviolet rays generated by the ultraviolet lamp;
An ultraviolet power measurement unit that repeatedly measures the power of the ultraviolet rays;
A distance measuring unit for measuring a distance from the ultraviolet lamp to the subject;
An irradiation energy calculation unit that calculates irradiation energy based on the measured ultraviolet power, the measured distance, and the irradiation time;
A specific signal output unit that sequentially compares the calculated irradiation energy to each of a plurality of target energies having different values, and outputs a specific signal each time the calculated irradiation energy reaches each of the target energies;
A perforated plate control unit that outputs a signal for sequentially closing a plurality of window holes provided in the perforated plate attached to the subject every time the specific signal is output;
A plurality of window hole marks are displayed in the same arrangement as that of the plurality of window holes of the perforated plate, and the numerical values of the target energy of each of the plurality of window holes and the order of closing the window holes are displayed together with the plurality of window hole marks. A display unit that displays numbers and changes the display mode of the plurality of window hole marks in the same order as the order of closing the window holes each time the specific signal is output. UV therapy device. The operation unit for the operator to select and designate one of the plurality of window hole marks in order to input a minimum irradiation amount at which the subject causes erythema with respect to ultraviolet rays. UV treatment device.

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