JP6234749B2 - Medical lighting device - Google Patents

Description

  The present invention relates to a medical illumination device that can illuminate a treatment target part at the time of a medical treatment by attaching a light source to the head of the medical practitioner and irradiating light in the line of sight of the practitioner. About.

  In a surgical environment such as a hospital, for example, when it is necessary to perform a surgical operation closer to a patient, the surrounding light may be insufficient and difficult to see due to the shadow of the medical practitioner himself. Therefore, a medical device that has a light source attached to the head of the medical practitioner and that can irradiate light from the light source in the same direction as the line of sight of the medical practitioner, thereby ensuring sufficient illuminance at the treatment target portion. Conventionally, there are a large number of lighting devices (see, for example, Patent Document 1 and Patent Document 2).

  However, since such a head-mounted medical lighting device is attached to a position close to the eye of the medical practitioner, the influence of heat generated from the light source of the lighting device is long after the medical treatment is performed for a long time. There is a problem that it becomes difficult to work. In addition, since the visual field of the practitioner is obstructed by the lighting device and the field of view is narrowed, the light source device is obstructed when talking or delivering medical instruments to instruct surrounding surgical assistants. May be.

  For this reason, there is also known a headlight having a configuration in which a light source unit composed of an LED and a light irradiation unit such as a lens are separated from each other and the light source unit and the light irradiation unit are connected by an optical fiber cable (for example, , See Patent Document 3). Such a headlight according to Patent Document 3 has a light source unit in which a heat sink and a heat insulating member are incorporated together with an LED, so that the volume of the spectral irradiation portion is small, and the light source unit is mounted near the eye of the operator. However, it does not limit the field of view of the practitioner and can prevent the surroundings of the eyes from becoming hot due to heat generated from the LEDs.

JP 2006-107846 A JP 2006-175235 A International Publication WO02 / 099332A1

  However, if the light source unit and the light irradiating unit are separately connected by an optical fiber cable or the like, the light guide part including the optical fiber cable becomes long, so the amount of light leakage is large, and the illuminance of light from the light irradiating unit Has the disadvantage of lowering.

  An object of this invention is to provide the medical light source device which prevented light leaking outside from the light guide part in view of the said subject.

In order to solve the above problems, a medical lighting device according to the present invention is a medical lighting device in which a light source unit and a lighting unit are connected by an optical fiber cable, and the light source unit includes an LED element and the LED. A first light guide that transmits light from the element to the incident end face of the optical fiber cable, and the illumination unit receives an incident lens and incident light from the output end face of the optical fiber cable at a shaft portion, and a collimator comprising a second light guide path for irradiating the illumination lens from the lens, and prevents fraud and mitigating risk leakage of light propagates inside the first light guide and the surface of the second light guide path It is characterized by forming a reflective film for the purpose. At this time, the shaft portion enlarges the beam diameter of the incident light and transmits it to the collimator lens by making the diameter of the end face on the collimator lens side larger than the diameter of the incident end face that receives light from the optical fiber cable. It is good to have a configuration.

  At this time, the reflective film can be formed of a metal thin film using a sputtering method or a vacuum deposition method. Further, the reflection film may be formed by adhering a reflection film made of polyester resin to the surface. Furthermore, there is a method of forming the reflective film by applying a reflective paint on the surface. By forming such a reflective film also on the surface of the optical fiber cable, it becomes more effective in preventing light leakage from the apparatus.

  The light source unit includes a pair of LED elements, and the first light guide path receives and emits light from each of the pair of light receiving units that receive light from the LED elements and the light receiving unit. And a focusing section for focusing the light to be united into one. The first light guide path may be composed of an acrylic light guide plate.

  The light receiving end face on which the light from the first light guide is incident may be configured to receive light from the LED element in the light receiving case. Furthermore, the reflective film may be formed on the inner surface of the light receiving case.

  The second light guide path is a multi-branch light guide that receives light from the output end face of the optical fiber cable, branches the light into a plurality of light beams, and irradiates the branched light from each of the irradiation lenses, The reflective film is formed on the surface of the side portion of the multi-branch light guide. At this time, an imaging device may be provided in the medical illumination device, and the irradiation lens may be disposed around the photographing lens of the imaging device.

  The medical lighting device according to the present invention can use a low power consumption LED or a plurality of LEDs to obtain the same illuminance by forming a reflective film for reflecting light on the inner peripheral surface of the light guide. Since the number can be reduced when using, an efficient medical lighting device can be provided.

The perspective view which shows the external appearance of the medical illuminating device which concerns on embodiment of this invention. FIG. 2 is a perspective view showing a part of the exterior case of the light source unit cut out in the medical lighting device shown in FIG. 1. Sectional drawing which shows the principal part of a light source unit from a side surface. Sectional drawing which shows a lighting unit from a side surface. Explanatory drawing which shows schematically the structure of the illumination unit at the time of incorporating an imaging device in the medical illuminating device which concerns on this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings.

  FIG. 1 shows a configuration of a medical lighting device according to the present invention. As shown in FIG. 1, the medical illumination device 1 includes a headband 2 for mounting on the head of a medical practitioner, and a light source unit 3 and an illumination unit 4 are attached to the headband 2. . The light source unit 3 is attached to the headband 2 so as to straddle the head of the attached practitioner from the front to the back of the head, and the illumination unit 4 is attached to a portion of the headband 2 that contacts the forehead of the practitioner. . Therefore, the illumination unit 4 can irradiate light along the line of sight of the practitioner. The light source unit 3 and the illumination unit 4 are connected by an optical fiber cable 5. Such a medical lighting device 1 is attached to a headband 2 fixed around the side of the practitioner's side, but is not limited to the headband 2 and may be in the shape of a cap that covers the head of the practitioner. .

  The exterior case 10 of the light source unit 3 is made of an integrally molded product of synthetic resin, but FIG. 2 shows a part of the interior of the exterior case 10 by cutting away, and FIG. Sectional drawing cut | disconnected by is shown. As shown in these drawings, the light source unit 3 is provided with a circuit board 7 on which a set of LED elements 6 are mounted. In this embodiment, one LED element 6 is arranged for each group, but a plurality of LED elements 6 may be arranged according to the required light intensity. In addition, the emission color of the LED element 6 is preferably white for medical illumination. A wiring pattern for supplying power to each LED element 6 is formed on the circuit board 7, and the surface of the circuit board 7 opposite to the surface on which the LED element 6 is mounted corresponds to each LED element 6. A heat sink 8 (not shown in FIG. 3) is attached to dissipate heat generated in the LED element 6.

  The light source unit 3 includes a light guide 13 that is a light guide formed by an acrylic plate for sending light from the LED element 6 into the optical fiber cable 5. The light guide 13 includes a pair of light receiving portions 13A that receive light from each of the pair of LED elements 6, and a focusing portion 13B that focuses the light received and emitted by each light receiving portion 13A. When viewed from the top, it has a “Y” shape.

  The light receiving end of each light receiving portion 13A and the LED element 6 are disposed to face each other in the light receiving case 15, and the light receiving end is tapered so that the area of the light receiving end surface 13a is enlarged. . Thereby, the light guide 13 can efficiently receive the light emitted from the LED element 6 by the light receiving end face 13a. The light receiving case 15 is attached to the mounting plate 28 together with the circuit board 7, and the light receiving portion 13 </ b> A of the light guide 13 is held in the exterior case 10 by the light receiving case 15.

  The exterior case 10 is provided with a connecting portion 16 so as to face the opening 14, and the emission end face 13 b of the light guide 13 is connected to the optical fiber cable 5 inserted through the opening 14 formed in the exterior case 10. They are connected by a connecting part 16.

  The light guide 13 has a reflection film formed on the surface other than the light receiving end face 13a and the emission end face 13b. For the reflective film, various conventionally known reflectors such as a metal thin film formed by sputtering or vacuum deposition or a reflective film formed by using a polyester-based resin can be used. In addition, a reflective coating may be applied to the surface to form a reflective film, and resin paints such as metal paints, polyester paints, acrylic paints, acrylic urethane paints, acrylic silicon paints, and epoxy paints can be applied. .

  For example, when the reflective film is formed using a metal thin film formed by sputtering, the light guide 13 and the target aluminum, silver, or the like while introducing an inert gas such as argon gas into the vacuum. A high direct-current voltage is applied to the metal having high light reflectivity, and ionized argon is collided with the target, whereby the repelled target is formed on the light guide 13 to form a reflective film.

  In this way, by forming a reflective film on the surface of the light guide 13, light from the LED element 6 incident on the light receiving end surface 13a of the light guide 13 at various angles is reflected by the reflective film while being reflected by the light guide 13. It propagates in the light and is condensed on the incident surface of the optical fiber cable 5. Therefore, since the amount of light loss in the light guide 13 is reduced, the light source unit 3 can efficiently transmit light to the optical fiber cable 5. Furthermore, it is preferable to form a reflective film on the inner surface in the light receiving case 15 from the same effect.

  The light source unit 3 includes a fan device 9 for cooling the inside of the exterior case 10. Although not shown, the fan device 9 includes a fan and a motor. When the fan is rotated by driving the motor, the outside air sucked from the suction port 11 is absorbed into the outer case 10 by the heat sink 8. An air passage that passes through the discharge port 12 and is discharged from the discharge port 12 to the outside again is formed. By this heat exchange, the temperature rise by the LED element 6 in the light source unit 3 can be suppressed, and the head of the practitioner can be prevented from becoming hot.

  The light source unit 3 is connected to the external control unit 24 by a harness 36. The control unit 24 is connected to a power supply unit 25 such as a battery and controls the supply of power to the LED element 6 and the motor energization terminal of the fan device 9 through the respective power supply lines in the harness 36. That is, the control unit 24 associates the drive of the LED element 6 with the drive of the fan device 9, and also stops the fan device 9 when the LED element 6 is not operating. Moreover, you may stop the fan apparatus 9 after the fixed time which made the LED element 6 non-operation. Furthermore, the light intensity of the light source unit 3 can be controlled by separately supplying power lines to the set of LED elements 6 and selectively driving both simultaneously or only one of them. Moreover, when the some LED element 6 is arrange | positioned for every group, you may comprise so that the LED element 6 to light-emit may be controlled, respectively.

  A switch 12A is provided on the surface of the control unit 24, and the practitioner can turn the power on / off by operating the switch 24A. In consideration of the operability at this time, the control unit 24 may be attached to the waist belt of the practitioner.

  As the optical fiber cable 5 that connects the light source unit 3 and the illumination unit 4, a type in which each of the core member and the clad member has a square cross-sectional shape is used. The optical fiber cable 5 is connected to the light source unit 3 disposed above the head and the illumination unit 4 disposed in the vicinity of the eyes of the face at an angle of approximately 90 degrees along the face from the head length. In a place where bending is strong, light leaks from there and becomes a loss. Therefore, the above-described reflective film may be formed on the surface of the optical fiber cable 5 by using a metal thin film formed by a sputtering method or a vacuum deposition method, a reflective film formed by using a polyester-based resin, a reflective paint, or the like.

  Next, the lighting unit 4 will be described. FIG. 4 shows a cross-sectional view of the illumination unit 4 cut at the side. The illumination unit 4 includes an optical connector 3A for connecting the optical fiber cable 5 and the collimator 18, and light propagated from the optical fiber cable 5 to the collimator 18. It is comprised from the irradiation part 3B provided with the irradiation lens 29 which irradiates the outside.

  The optical connector 3A is provided with an opening 17 into which the optical fiber cable 5 is inserted on the base end side, and protrudes in an annular shape from the inner wall toward the center so as to surround the periphery of the optical fiber cable 5 inside the hollow exterior case 19. A locking portion 26 is formed. Therefore, the inserted optical fiber cable 5 is held by the peripheral edge of the opening 17 and the locking portion 26 in a state in which the output side end face is in close contact with the incident side of the collimator 18. A mounting portion 27 is provided outside the outer case 19, and the lighting unit 4 is fixed by screwing the mounting portion 27 to the headband 2.

  The collimator 18 is a light guide for transmitting light from the emission end face of the optical fiber cable 5 to the irradiation lens 29, and includes a collimator body 18a and a collimator lens 18b which are shaft portions. The diameter of the end face on the exit side of the collimator body 18a is configured to be larger than the diameter of the end face on the entrance side, and the first half portion in the axial direction of the collimator body 18a has the same diameter, that is, a cylindrical shape. In this part, the diameter is gradually increased and the side surface is made a parabolic shape. Therefore, the light incident on the collimator 18 from the optical fiber cable 5 is expanded in beam diameter by the collimator body 18a and converted into parallel light by the collimator lens 18b. The collimator 18 has a flange 18c between the collimator body 18a and the collimator lens 18b. The diameter of the collar portion 18c is set larger than the diameter of the base portion of the collimator lens 18b.

  Then, the surface of the collimator 18 is made of a sputtering method or a vacuum evaporation method in the same manner as the light guide 13 of the light source unit 3 except for the contact surface between the collimator lens 18b and the output end of the fiber cable 5 of the collimator body 18a. The above-described reflective film may be formed of a metal thin film, a reflective film formed using a polyester resin, a reflective paint, or the like.

  In the optical connector 3A, a plurality of locking pieces 20 are arranged in an annular shape at the end opposite to the base end side including the opening 17, and the maximum of the circle in which the locking pieces 20 are arranged in a ring shape The diameter portion is set to be slightly larger than the inner diameter of the opening 22 formed in the exterior case 21 of the irradiation unit 3B. Since the locking piece 20 has elasticity, by fitting the locking piece 20 into the opening 22 against this elasticity, the locking piece 20 comes into contact with the inner peripheral wall of the locking piece 20 and the opening 22 and light. Connector 3A and irradiation part 3B are combined.

  The outer case 21 of the irradiating unit 3B is formed integrally with a cylindrical body 21A having an opening 22 formed in an upper portion and a lens holding body 21B. At the boundary between the cylindrical body 21 </ b> A and the lens holding body 21 </ b> B, there is provided a receiving portion 30 that is formed to project from the inner surface of the outer case 21 in an annular shape toward the center. Therefore, when the optical connector 3A and the irradiation unit 3B are coupled, the collar portion 18c of the collimator 18 is locked to the receiving portion 30, and the collimator body 18a is held in the cylindrical body 21A so as to be in close contact with the optical fiber cable 5. State is maintained. On the other hand, the collimator lens 18b is exposed in the space of the lens holding body 21B from the opening formed by the receiving portion 30.

  The lens holder 21B is provided with a diaphragm 25 for adjusting the amount of light from the collimator lens 18b. In this case, when the aperture ring 26 that is rotatably fitted in the outer case 21 is rotated, the pin 28 moves in the circumferential direction, thereby opening and closing the aperture blades 25a that are arranged so as to overlap each other. By doing so, it is a conventionally known configuration that enables adjustment of the diameter of the passage port through which the light from the collimator lens 18b passes.

  The outer peripheral wall of the lens holding body 21B is composed of a portion inclined with respect to the axis of the cylindrical body 21A and a bent portion, and a mirror 23 is arranged on the surface of the inner wall of the inclined portion. An irradiation lens 29 is attached to the tip opening of the lens holder 21B. Therefore, the light from the collimator lens 18b irradiated in the axial direction of the cylindrical body 21A is reflected by the mirror 23, collected by the irradiation lens 29, and emitted to the outside. At this time, the direction of the light from the collimator lens 18b irradiated along the axial direction of the cylindrical body 21A matches the line of sight of the medical practitioner wearing the headband 2 on the head. The inclination angle of the inclined surface of the outer peripheral wall and the bending angle of other parts are set. In this case, if the above-described reflective film is formed on the entire inner wall of the lens holder 21B by a metal thin film formed using a sputtering method or a vacuum deposition method, a reflective film formed using a polyester resin, a reflective paint, or the like. The light from the collimator lens 18b is refracted to the irradiation lens 29 and the loss of light at the lens holder 21B is also suppressed.

  In the light source unit 3 configured as described above, in the light source unit 3, the light from the pair of LED elements 6 is received by the light guide 13 and converged into one light beam, and then transmitted to the illumination unit 4 through the optical fiber cable 5. In the illumination unit 4, when light enters the collimator 18, the light is converted into parallel light by the collimator lens 18b and emitted to the lens holder 21B. The amount of light emitted to the lens holder 21B is adjusted by the diaphragm 25, but the light that has passed through the diaphragm 25 is reflected by the mirror 23, collected by the irradiation lens 29, and emitted to the outside as illumination light. Is done.

  In such an optical transmission path, the light guide 13 and the collimator 18 are each formed with a reflective film, so that light leakage can be suppressed and the light emission efficiency from the collimator lens 18b can be increased. Therefore, since high illuminance can be obtained on the irradiation lens 29 side, the small-capacity LED element 6 can be used. As a result, the amount of heat generated from the LED element 6 is reduced, and accordingly, the fan device 9 is small and the medical lighting device is miniaturized.

  Next, an embodiment when the imaging device is attached to the illumination unit 4 using the medical illumination device according to the present invention will be described.

  FIG. 5 schematically shows a configuration of the illumination unit 4 in which the imaging device 31 is incorporated in the exterior case 35 for imaging the state of the treatment performed by the practitioner. The imaging device 31 includes a photographic lens 32 that allows light from a subject to enter, a CCD or CMOS imaging device that photoelectrically converts reflected light from the subject through the photographic lens 32 into an analog electrical signal, and generates an image signal. It is a miniaturized digital video camera or still camera used in various fields including conventional ones.

  The multi-branch light guide 33 that is the second light guide is connected in close contact with the light emitting end face of the optical fiber cable 5 by a connector 33b. The multi-branch light guide 33 includes four cables 33a formed of optical fibers as shown in FIG. 5A, and an irradiation lens 34 is attached to the output end of each cable 33a. The irradiation lenses 34 are annularly arranged at equal intervals so as to surround the photographing lens 32 as shown in FIG. Further, on the surface of the side portion of the multi-branch light guide 33, the above-described reflection film is formed by a metal thin film formed by sputtering or vacuum deposition, a reflection film formed by using a polyester-based resin, a reflection paint, or the like. Has been.

  Such a multi-branch light guide 33 branches the light emitted from the optical fiber cable 5 in four directions by the cable 33 a and irradiates it through each irradiation lens 34. Thereby, the practitioner can capture a clear image with the imaging device 31 while ensuring the illuminance of the treatment target portion. Then, the image information photographed by the photographing apparatus 31 is recorded by the recording means, and various recording media such as various types of disks and memories are used as the recording means.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible based on the meaning of this invention, and these are not excluded from the scope of the present invention.

  The present invention relates to a medical lighting device capable of effectively irradiating light on a treatment target portion by attaching a light source to a medical practitioner's head during medical treatment, and has industrial applicability.

DESCRIPTION OF SYMBOLS 1 Medical illuminating device 2 Headband 3 Light source unit 4 Illumination unit 5 Optical fiber cable 6 LED element 13 Light guide (1st light guide)
13A Light receiving unit 13B Converging unit 18 Collimator (second light guide)
18a Shaft (collimator body)
18b Collimator lens 29 Irradiation lens 31 Imaging device 33 Multi-branch light guide (second light guide)
34 Irradiation lens

Claims (12)

A medical lighting device in which a light source unit and a lighting unit are connected by an optical fiber cable,
The light source unit includes an LED element, and a first light guide that transmits light from the LED element to an incident end face of the optical fiber cable,
The illumination unit includes an irradiation lens, and a second light guide path that receives incident light from an output end surface of the optical fiber cable at a shaft portion and irradiates the irradiation lens from the collimator lens ,
A medical illumination device, wherein a reflection film for preventing leakage of light propagating through the inside is formed on the surfaces of the first light guide path and the second light guide path. The shank, medical lighting device according to claim 1, characterized in that the diameter of the end face of the collimator lens side is larger than the diameter of the entrance end surface for receiving light from said optical fiber cable. The reflective film is a medical illumination device according to claim 1 or 2, characterized in that a metal thin film formed by a sputtering method or a vacuum evaporation method. The reflective film is a medical illumination device according to claim 1 or 2, characterized in that a reflective film formed using a polyester resin. The reflective film is a medical illumination device according to claim 1 or 2, characterized in that a light reflecting coating of a metal or resin. The light source unit includes a set of LED elements,
The first light guide path includes a pair of light receiving portions that receive light from each of the LED elements, and a converging portion that focuses the light received and emitted by each of the light receiving portions. The medical lighting device according to claim 1 or 2 . The medical lighting device according to claim 6 , wherein the first light guide path is an acrylic light guide plate. The medical illumination device according to claim 6 , wherein the light receiving end face on which the light of the first light guide is incident receives light from the LED element in the light receiving case. The medical lighting device according to claim 8 , wherein the reflective film is formed on an inner surface of the light receiving case. Medical lighting device according to claim 1 or 2, characterized in that the formation of the reflective film on a surface of the optical fiber cable. The second light guide path is a multi-branch light guide that receives light from an output end face of the optical fiber cable, branches the light into a plurality of light beams, and irradiates the branched light from the irradiation lenses. medical lighting device according to claim 1 or 2, characterized in that the surface of the light guide the side to form the reflective film. An image pickup device, a medical illumination device according to claim 1 or 2, characterized in that a said irradiation lens around the taking lens of the image pickup device.

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