WO2012098623A1 - レーザ治療装置、レーザ治療システム及び判別方法 - Google Patents
レーザ治療装置、レーザ治療システム及び判別方法 Download PDFInfo
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- WO2012098623A1 WO2012098623A1 PCT/JP2011/007230 JP2011007230W WO2012098623A1 WO 2012098623 A1 WO2012098623 A1 WO 2012098623A1 JP 2011007230 W JP2011007230 W JP 2011007230W WO 2012098623 A1 WO2012098623 A1 WO 2012098623A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0613—Apparatus adapted for a specific treatment
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/20—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/20—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser
- A61B18/22—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser the beam being directed along or through a flexible conduit, e.g. an optical fibre; Couplings or hand-pieces therefor
- A61B18/24—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser the beam being directed along or through a flexible conduit, e.g. an optical fibre; Couplings or hand-pieces therefor with a catheter
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0601—Apparatus for use inside the body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0613—Apparatus adapted for a specific treatment
- A61N5/062—Photodynamic therapy, i.e. excitation of an agent
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00315—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for treatment of particular body parts
- A61B2018/00345—Vascular system
- A61B2018/00351—Heart
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00636—Sensing and controlling the application of energy
- A61B2018/00642—Sensing and controlling the application of energy with feedback, i.e. closed loop control
- A61B2018/00648—Sensing and controlling the application of energy with feedback, i.e. closed loop control using more than one sensed parameter
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/06—Measuring instruments not otherwise provided for
- A61B2090/064—Measuring instruments not otherwise provided for for measuring force, pressure or mechanical tension
- A61B2090/065—Measuring instruments not otherwise provided for for measuring force, pressure or mechanical tension for measuring contact or contact pressure
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/06—Devices, other than using radiation, for detecting or locating foreign bodies ; determining position of probes within or on the body of the patient
Definitions
- the present invention relates to a laser treatment apparatus, a laser treatment system, and a discrimination method applicable to these apparatuses and systems for treating a treated tissue using a laser catheter.
- Atrial fibrillation is known as a type of tachyarrhythmia. Atrial fibrillation occurs when an abnormal excitation site that generates an electric pulse appears near the junction between the pulmonary vein and the left atrium, and the left atrium vibrates and contracts finely by stimulation of the electric pulse.
- PDT photodynamic therapy
- singlet oxygen is generated by irradiating myocardial tissue into which a photosensitizing agent has been incorporated with excitation light using a laser catheter.
- Singlet oxygen with strong oxidizing power damages the myocardial tissue surrounding the abnormally excited site, and forms an electrical conduction block that blocks (blocks) the conduction of electrical pulses from the abnormally excited site to the left atrium.
- electrical conduction between the abnormal excitation site and the left atrium is blocked, and abnormal vibration and contraction of the left atrium are suppressed.
- Photosensitive drugs have the property of selectively accumulating in specific tissues. Therefore, in general, after a predetermined time (for example, 8 to 48 hours) has elapsed since the photosensitizing agent was administered to the patient, the photosensitizing agent concentration in the treated tissue is high and the photosensitizing agent concentration in other tissues or blood is low.
- the excitation light is irradiated after the contrast of the so-called photosensitizing agent is obtained.
- a PDT that irradiates excitation light when the photosensitive drug is delivered to the tissue to be treated by blood without using the accumulation property of the photosensitive drug has been proposed.
- Patent Documents 2 and 3 describe techniques for detecting the contact state of the tip with tissue.
- tip part at the time of contact is estimated from return light, and the contact state with respect to the structure
- tip part is detected by it.
- a pressure sensor is provided at the tip, thereby detecting the contact state of the tip with the tissue.
- an object of the present invention is to provide a laser treatment apparatus, a laser treatment system, and a discrimination method capable of discriminating a contact state including a buried state of a tip of a laser catheter with respect to a tissue. It is in. Another object of the present invention is to provide a laser treatment apparatus, a laser treatment system, and a discrimination method capable of realizing such discrimination with a simple configuration.
- a laser treatment apparatus includes a connection unit, an emission unit, an optical state detection unit, an electrical state detection unit, and a determination unit.
- connection portion has a first end portion and a second end portion, and laser light enters and exits from the front end surface of the first end portion, along the axial direction of the outer periphery of the first end portion.
- the second end of a laser catheter having an electrode provided is connected.
- the emission unit emits laser light to the second end connected to the connection unit.
- the optical state detection unit receives the return light from the second end connected to the connection unit, and detects the optical state of the incident return light.
- the electrical state detection unit detects the electrical state of the electrode through the second end connected to the connection unit.
- the discriminating unit discriminates the contact state between the first end and the tissue to be treated using the laser catheter based on the detected optical state and the electrical state.
- the optical state detection unit detects the intensity of the incident return light
- the electrical state detection unit detects a potential of the electrode.
- a unit determines that the contact state between the first end and the tissue to be treated is normal when the detected light intensity is low and the detected potential is low, and the detected light intensity Is weak and the detected potential is high, it is determined that the first end is buried in the tissue to be treated, the detected light intensity is strong, and the detected potential is high, You may comprise so that it may discriminate
- a laser treatment system includes a laser catheter, a connection unit, an emission unit, an optical state detection unit, an electrical state detection unit, and a determination unit.
- the laser catheter has a first end and a second end, a laser beam enters and exits from a distal end surface of the first end, and the first end is disposed on an outer periphery of the first end. And an electrode provided along the axial direction of the portion.
- the connecting portion is connected to the second end of the laser catheter.
- the emission unit emits laser light to the second end connected to the connection unit.
- the optical state detection unit receives return light from the second end connected to the connection unit, and detects an optical state of the incident return light.
- the electrical state detection unit detects the electrical state of the electrode through the second end connected to the connection unit.
- the discriminating unit discriminates a contact state between the first end and the tissue to be treated using the laser catheter based on the detected optical state and the electrical state.
- the electrode provided on the laser catheter may be a ring-shaped electrode.
- a determination method includes a first end and a second end, a laser beam is emitted from a front end surface of the first end, and the first end is A laser beam is emitted to the second end of the laser catheter having an electrode provided on the outer periphery along the axial direction of the first end, and a return light from the second end is incident. An optical state of the incident return light is detected, and an electrical state of the electrode is detected. Based on the detected optical state and the electrical state, the first end portion and the laser catheter are connected to each other. The contact state with the treated tissue to be treated is discriminated.
- the contact state of the tip of the laser catheter including the buried state with respect to the tissue can be determined, and the contact state including the buried state can be determined with a simple configuration.
- FIG. 6 is a cross-sectional view taken along line AA in FIG. 5.
- FIG. 5 is a schematic diagram which shows the contact state to the structure
- FIG. 1 is a schematic diagram showing an entire treatment system including a PDT apparatus according to an embodiment of the present invention.
- the PDT apparatus 1 includes a PDT apparatus main body 100, a tube 200 connected to the PDT apparatus main body 100, and a connector (connection portion) 210 provided at the tip of the tube 200.
- the tube 200 is a hollow soft tube, can transmit light through a built-in device-attached optical fiber 201 (see FIG. 3), and also through a built-in device-attached electrical wiring 202 (see FIG. 3). Thus, measurement of the potential at the tip of the laser catheter 300 can be performed.
- the laser catheter 300 is detachably connected to the connector 210.
- Patient 2 is administered a photosensitive drug.
- the administered photosensitive drug diffuses into the blood and further diffuses into tissues such as myocardial tissue.
- the photosensitive drug may be administered in batches as necessary for treatment by intravenous injection, continuously by infusion, batch or continuous administration from the oral route, or local administration.
- Photosensitive drugs are drugs that absorb and excite specific wavelengths of light and emit fluorescence. For example, there is a drug called talaporfin sodium (Rezafilin (registered trademark), Meiji Seika Co., Ltd.).
- FIG. 2 is a schematic view showing a laser catheter inserted into the heart.
- FIG. 3 is a block diagram showing the PDT apparatus main body.
- the PDT apparatus main body 100 includes a light source 110, an optical system 120, an optical state detection unit 130, a potential detection unit 135, an electrocardiogram acquisition unit 140, a control unit 150, a storage unit 160, and a display unit 170. And an operation unit 180.
- the light source 110 outputs excitation light of a photosensitive drug.
- the wavelength of the light output from the light source 110 is equal to the absorption wavelength in the Q band of the photosensitive drug.
- a photosensitizer having a Q-band absorption wavelength of around 664 nm a semiconductor laser having an oscillation wavelength of 600-800 nm, preferably 660-680 nm, more preferably 664 ⁇ 2 nm is used as the light source 110.
- Excitation light (laser light) output from the light source 110 is incident on the laser catheter 300 by the optical system 120.
- the optical system 120 makes excitation light emitted from the light source 110 incident on the laser catheter 300 connected to the connector 210 via the optical fiber 201 attached to the apparatus.
- the optical system 120 takes out the fluorescence (return light) emitted from the photosensitive drug irradiated with the excitation light from the laser catheter 300 and enters the optical state detection unit 130.
- the optical system 120 includes a short pass filter 121, a first lens 122, a polarizing beam splitter (hereinafter referred to as “PBS”) 123, a long pass filter 124, and a second lens 125. Have.
- the short pass filter 121 is a short wavelength transmission filter having a cut-on wavelength of 670 nm, and cuts radiation on the long wave side of the laser light.
- Excitation light from the light source 110 has a radiation component in the fluorescence observation wavelength region (longer wavelength side than the peak wavelength). Therefore, the radiation component on the long wave side of the excitation light is cut before the light is condensed on the laser catheter 300.
- the excitation light transmitted through the short pass filter 121 is incident on the first lens 122.
- the first lens 122 condenses the excitation light incident from the short pass filter 121 on one end surface of the laser catheter 300.
- the first lens 122 condenses the fluorescence from the distal end portion of the laser catheter 300 on the PBS 123.
- a part of the excitation light from the light source 110 is reflected from the end face of the device-attached optical fiber 201 on the PDT device main body 100 side, the connector 210, or the distal end portion of the laser catheter 300, and enters the PBS 123 as specularly reflected light. .
- specularly reflected lights become noise when detecting fluorescence.
- the PBS 123 transmits the specularly reflected light reflected by the end face of the optical fiber in the tube 200 using the difference in deflection among the light incident from the first lens 122, and detects fluorescence and other end faces.
- the regular reflection light at is reflected and guided to the detector.
- the fluorescence transmitted through the PBS 123 enters the long pass filter 124.
- the long pass filter 124 does not transmit the specularly reflected light reflected from the inside of the connector 210 and the tip of the laser catheter 300 out of the light incident from the PBS 123, but transmits only the fluorescence and guides it to the detector.
- the fluorescence that has passed through the long pass filter 124 enters the second lens 125.
- the second lens 125 condenses the fluorescence incident from the long pass filter 124 on the optical state detection unit 130.
- the optical state detection unit 130 is a linear image sensor, for example, and spectrally detects fluorescence incident from the optical system 120. That is, the optical state detection unit 130 detects the fluorescence of the photosensitive agent that is light having an excitation wavelength and light longer than the light having the excitation wavelength. The optical state detection unit 130 outputs the detected fluorescence intensity to the control unit 150 as an electrical signal.
- the potential detector 135 detects the potential of the second electrode (described later) with respect to the first electrode at the distal end of the laser catheter 300.
- the potential detection unit 135 outputs the detected potential to the control unit 150 as an electrical signal.
- An electrode pad 141 is connected to the electrocardiogram acquisition unit 140 via an electrode cord (not shown).
- the electrocardiogram acquisition unit 140 acquires the electrocardiogram signal of the patient 2 via the electrode pad 141 and the electrode cord attached to the patient 2 and supplies the acquired electrocardiogram signal to the control unit 150.
- the control unit 150 controls each unit in the PDT apparatus 1.
- the control unit 150 determines the contact state including the embedded state of the laser catheter 300 with respect to the tissue based on the electrical signals acquired from the optical state detection unit 130 and the potential detection unit 135.
- the control unit 150 determines whether or not an electric conduction block is formed based on the electrical signal acquired from the optical state detection unit 130 and the electrocardiogram signal acquired from the electrocardiogram acquisition unit 140.
- the control unit 150 outputs a display command for displaying information on the determination result of the contact state including the buried state.
- the storage unit 160 is a non-volatile memory, and is set to, for example, a flash memory, an HDD (Hard Disk Drive), or other solid-state memory.
- the display unit 170 is a display device using, for example, a liquid crystal display.
- the display unit 170 displays, for example, information on the contact state determination result including the buried state on the display screen based on the display information included in the display command.
- the operation unit 180 receives a command by an input operation from the practitioner, and outputs the received command to the control unit 150.
- the command is, for example, a command related to on / off of excitation light output from the light source 110, intensity switching, and the like.
- the intensity of the excitation light is at least a first intensity of low power (for example, an optical output of 1 mW or less) that is minimally invasive to tissues and blood, and a high power of about 1000 times the first intensity. Two types with two intensities can be selected. The first intensity is selected when the drug concentration or the contact state of the laser catheter 300 is monitored before treatment. The second intensity is selected when performing the actual treatment.
- [Configuration of laser catheter] 4 is a view showing the appearance of the laser catheter
- FIG. 5 is a partial cross-sectional view of the distal end portion of the laser catheter shown in FIG. 4
- FIG. 6 is a cross-sectional view taken along line AA in FIG.
- the laser catheter 300 emits excitation light from the end surface of the distal end portion (first end portion).
- the laser catheter 300 includes a catheter tube 310, a first end 311, a second end 312, a support 320, an optical fiber 330, an optical window 340, a plurality of electrodes 351 and 352, and wiring 353.
- the catheter tube 310 is a hollow soft tube and is guided to the inner wall of the myocardial tissue of the heart 10 of the patient 2.
- the catheter tube 310 contains the optical fiber 330 and the wiring 353.
- the catheter tube 310 has a first end 311 and a second end 312 at both ends.
- the support part 320 is provided at the first end 311 of the laser catheter 300.
- the support part 320 holds the optical fiber 330 and the optical window 340 with respect to the catheter tube 310.
- a plurality of electrodes 351 and 352 are provided on the outer periphery of the support portion 320 so as to have a predetermined interval t in the axial direction (X direction in the drawing) of the support portion 320 that is the first end portion 311.
- the plurality of electrodes 351 and 352 are made of, for example, Pt and have a ring shape.
- One electrode 351 among the plurality of electrodes 351 and 352 is located, for example, up to the most distal end portion of the support portion 320.
- the electrode 351 may extend to the end surface portion of the support portion 320.
- the electrode 351 may be slightly spaced from the most distal end of the support part 320.
- one electrode 351 among the plurality of electrodes 351 and 352 is wider than the other electrode 352, and the interval t between the plurality of electrodes 351 and 352 is about 2 mm.
- the interval t between the plurality of electrodes 351 and 352 and other dimensions are such that when the first end 311 of the laser catheter 300 is buried in the tissue, the plurality of electrodes 351 and 352 contact the tissue, respectively. It is only necessary to detect a change in potential of the second electrode with respect to the first electrode.
- the plurality of electrodes 351 and 352 are connected to the device-attached electric wiring 202 at the second end 312 via the respective wires 353 and are connected to the potential detection unit 135 of the PDT device main body 100.
- the potential detection unit 135 detects the potential information of the myocardial tissue from the electrode in contact with the myocardial tissue.
- the potential detection unit 135 may detect a potential difference between the pair of electrodes 351 and 352 by applying a predetermined voltage to the electrode 351 and detecting the potential of the electrode 352. When the electrode 352 is not in contact with the tissue, the potential of the detected electrode 352 is low, and when the electrode 352 is not in contact with the tissue, the potential of the detected electrode 352 is high.
- the optical fiber 330 is, for example, one quartz step index fiber having a core diameter of 133 ⁇ m and an outer shape of 500 ⁇ m, a core diameter of 200 ⁇ m, and an outer shape of 350 ⁇ m.
- the optical fiber 330 transmits the excitation light from the PDT device 1.
- the optical fiber 330 emits the transmitted excitation light as irradiation light 301 to the optical window 340 from the tip.
- the beam diameter of the irradiation light 301 increases at an angle determined by the opening (NA) of the optical fiber 330.
- the tip of the optical fiber 330 is processed so that the beam diameter of the irradiation light 301 is appropriately increased.
- the optical fiber 330 transmits the fluorescence emitted by the photosensitive drug taken into the tissue irradiated with the excitation light to the PDT device 1.
- the optical window 340 is provided on the outermost part of the distal end portion of the laser catheter 300 so as to be optically continuous with the distal end of the optical fiber 330.
- the optical window 340 is made of a solid transparent material, for example, a glass material such as BK7.
- the optical window 340 transmits the irradiation light 301 emitted from the tip of the optical fiber 330.
- the optical window 340 collects the fluorescence emitted from the photosensitive drug at the tip of the optical fiber 330.
- the light source 110 outputs excitation light at a first intensity
- the control unit 150 is based on the fluorescence intensity detected by the optical state detection unit 130 and the potential detected by the potential detection unit 135.
- the contact state including the buried state with respect to the tissue inner wall is discriminated.
- the light source 110 outputs the excitation light at the second intensity, and the actual laser treatment is executed. Also in this operation, as in the contact monitoring operation, the contact state including the embedded state of the laser catheter 300 with respect to the tissue inner wall is determined. In the following, these operations will be described in more detail.
- FIG. 7 is a schematic diagram showing a contact state of the laser catheter.
- the laser catheter 300 is preferably arranged so that the distal end portion (first end portion) as a light emitting portion is in perpendicular contact with the inner wall of the myocardial tissue 11 (see FIG. 7A, hereinafter “vertical contact state”). ”). This is because the atrial blood 15 is excluded from the tip of the laser catheter 300 to suppress activation of the photosensitive drug in the atrial blood 15. Another reason is to selectively activate the photosensitive drug present in the tissue by bringing the tip of the laser catheter 300 into direct contact with the tissue.
- the distal end portion of the laser catheter 300 is not perpendicular to the inner wall of the myocardial tissue 11, but may be tilted and contacted as shown in FIG. As shown in FIG. 7C, the distal end portion of the laser catheter 300 may be embedded in the inner wall of the myocardial tissue 11, or may be inclined and embedded as shown in FIG. 7D. As shown in FIG. 7 (e), the tip of the laser catheter 300 may not even contact the inner wall of the myocardial tissue 11.
- the control unit 150 includes the embedded state of the laser catheter 300 in the tissue inner wall based on the fluorescence intensity detected by the optical state detection unit 130 and the potential detected by the potential detection unit 135. The contact state is determined.
- FIG. 8 is a table showing the relationship between the detected fluorescence intensity and potential and the contact states shown in FIGS. 7 (a) to 7 (e).
- the fluorescence intensity detected by the optical state detection unit 130 is medium.
- the potential of the electrode 352 detected by the potential detection unit 135 is low.
- the potential of the electrode 352 detected by the potential detection unit 135 is not low, so that the potential detection unit 135 becomes the electrode 352.
- the optical state detection unit 130 detects it.
- the fluorescence intensity is strong.
- the potential of the electrode 352 detected by the potential detection unit 135 is high.
- the potential detection unit 135 detects the potential. The potential of the electrode 352 is low.
- the optical state detection unit 130 when the distal end portion of the laser catheter 300 is not in contact with the inner wall of the myocardial tissue 11, the optical state detection unit 130 has a high fluorescence intensity, so the optical state detection unit 130 has a high fluorescence intensity. By detecting this, it is possible to determine whether the catheter is in contact with the myocardial tissue. In addition, the information of the potential detection unit 135 alone does not reveal the difference between the state (e) (the state in which the electrode 352 is in contact with the myocardial tissue) and (c) and (d). The state of the tip can be determined.
- the control unit 150 Based on the electrical signals acquired from the optical state detection unit 130 and the potential detection unit 135, the control unit 150 is in contact with the tissue of the laser catheter 300 including the embedded state, that is, the above-described FIGS. It is determined whether it is in any one of e). For example, the control unit 150 displays a predetermined warning on the display unit 170 when it is in the state of FIGS. At that time, the control unit 150 may display so as to distinguish between FIGS. 7C, 7D, and 7E. Thereby, a practitioner such as a doctor can recognize that the doctor is buried, and can reduce an excessive force on the myocardial tissue. Accordingly, side effects can be reduced, the burden on the patient can be reduced, and the influence on surrounding organs can be prevented.
- the practitioner operates the operation unit 180 to input an excitation light output command with a high power second intensity to the control unit 150.
- the control unit 150 outputs the excitation light output command with the second intensity to the light source 110.
- the light source 110 receives the excitation light output command from the control unit 150, the light source 110 outputs the excitation light with the second intensity.
- the excitation light output from the light source 110 is irradiated to the tissue through the optical system 120 and the laser catheter 300, and photodynamic therapy is performed.
- the contact state including the embedded state of the laser catheter 300 with respect to the tissue inner wall is discriminated similarly to the contact monitor operation. That is, the control unit 150 is based on the electrical signals acquired from the optical state detection unit 130 and the potential detection unit 135, and includes the contact state including the embedded state of the laser catheter 300 with respect to the tissue, that is, the above-described FIG. It is discriminated whether any one of the states (1) to (e) is present. A predetermined warning is displayed on the display unit 170. Thereby, similarly to the above, a practitioner such as a doctor can recognize that the doctor is buried, and can reduce an excessive force on the myocardial tissue.
- the plurality of electrodes 351 and 352 are originally used for treatment (for example, simple treatment effect and contact state determination, etc.), and a device that is not necessary for treatment such as a pressure sensor is mounted. Since there is no need, the contact state including the buried state can be determined with a simple configuration.
- the embodiment according to the present invention is not limited to the above-described embodiment, and various other forms are conceivable.
- the laser catheter 300 is detachably connected to the connector 210 of the PDT apparatus 1, but the laser catheter 300 may be provided integrally with the PDT apparatus 1.
- the tube 200 is provided in the PDT apparatus main body 100 and the connector 210 is provided at the tip of the tube 200.
- the connector 210 may be provided in the PDT apparatus main body 100.
- the fluorescence intensity is described as an example of the optical state to be detected.
- the optical state for example, a difference in diffuse reflected light intensity between tissue and blood (excitation light) may be used.
- the electric state to be detected has been described by taking a potential as an example.
- a resistor or the like may be used as the electric state.
- two electrodes 351 and 352 have been described as an example.
- the number of electrodes may be one, or three or more.
- the shape in which the electrode is formed in a ring shape has been described as an example. However, the shape may be a comb-tooth shape or a saw-tooth shape.
- Photodynamic Therapy (PDT) device 100 PDT device main body 110 Light source (emission part) 130 Optical state detector 135 Potential detector (electrical state detector) 150 Control unit (discrimination unit) 210 Connector (connection part) 300 Laser catheter 311 First end 312 Second end 351, 352 Electrode
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Abstract
Description
本発明の別の目的は、そのような判別を簡単な構成で実現することができるレーザ治療装置、レーザ治療システム及び判別方法を提供することにある。
出射部は、前記接続部に接続された第2の端部にレーザ光を出射する。
光学的状態検出部は、前記接続部に接続された第2の端部からの戻り光を入射し、前記入射した戻り光の光学的状態を検出する。
電気的状態検出部は、前記接続部に接続された第2の端部を介して前記電極の電気的状態を検出する。
本発明の一形態に係るレーザ治療システムは、レーザカテーテルと、接続部と、出射部と、光学的状態検出部と、電気的状態検出部と、判別部とを有する。
接続部は、前記レーザカテーテルの第2の端部が接続される。
出射部は、前記接続部に接続された第2の端部にレーザ光を出射する。
光学的状態検出部は、前記接続部に接続された第2の端部からの戻り光を入射し、前記入射した戻り光の光学的状態を検出する。
電気的状態検出部は、前記接続部に接続された第2の端部を介して前記電極の電気的状態を検出する。
ここで、本発明は、前記レーザカテーテルに設けられた電極は、リング状の電極で構成してもよい。
[システム全体の構成]
図1は、本発明の一実施形態に係るPDT装置を含めた治療システム全体を示す模式図である。
コネクタ210には、レーザカテーテル300が着脱可能に接続される。
図2は、心臓に挿入されたレーザカテーテルを示す模式図である。
[PDT装置本体の構成]
図3は、PDT装置本体を示すブロック図である。
第2のレンズ125は、ロングパスフィルタ124より入射した蛍光を光学的状態検出部130に集光する。
制御部150は、PDT装置1内の各部を制御する。
制御部150は、埋没状態も含めた接触状態の判別結果の情報を表示するための表示命令を出力する。
記憶部160は、不揮発性メモリであり、例えばフラッシュメモリ、HDD(Hard Disk Drive)、その他の固体メモリに設定される。
[レーザカテーテルの構成]
図4は、レーザカテーテルの外観を示す図であり、図5は、図4に示したレーザカテーテルの先端部の一部断面図、図6は、図5のA-A断面図である。
[PDT装置の動作]
次に、以上のように構成されたPDT装置1の動作について説明する。
PDT装置1の動作の説明は、以下の順序で行うものとする。
(1)PDTの準備
(2)接触モニター動作
(3)レーザ治療実施動作
以下では、これらの動作をさらに詳細に説明する。
[(1)PDTの準備]
続いて、施術者により、各種レファレンスデータを参考に、患者2に光感受性薬剤が投与される。
[(2)接触モニター動作]
続いて、接触モニター動作が行われる。
図7は、レーザカテーテルの接触状態を示す模式図である。
図8は、検出される蛍光強度及び電位と図7(a)~(e)に示した接触状態との関係を示す表である。
[(3)レーザ治療実施動作]
本発明に係る実施形態は、以上説明した実施形態に限定されず、他の種々の形態が考えられる。
上記実施形態では、検出する光学的状態として蛍光強度を例にして説明したが、光学的状態としては例えば組織と血液の(励起光の)拡散反射光強度の差異等を用いてもよい。
上記実施形態では、検出する電気的状態として電位を例にして説明したらが、電気的状態としては例えば抵抗等を用いてもよい。
上記実施形態では、2本の電極351、352を例にして説明したが、電極は1本であってもよく、また3本以上であってもよい。
上記実施形態では、電極をリング状にした形状を例にして説明したが、櫛歯状や鋸歯状の形状であってもよい。
100 PDT装置本体
110 光源(出射部)
130 光学的状態検出部
135 電位検出部(電気的状態検出部)
150 制御部(判別部)
210 コネクタ(接続部)
300 レーザカテーテル
311 第1の端部
312 第2の端部
351、352 電極
Claims (5)
- 第1の端部及び第2の端部を有し、前記第1の端部の先端面よりレーザ光を出入射し、
前記第1の端部の外周に前記第1の端部の軸方向に沿って設けられた電極を有するレーザカテーテルの前記第2の端部が接続される接続部と、
前記接続部に接続された第2の端部にレーザ光を出射する出射部と、
前記接続部に接続された第2の端部からの戻り光を入射し、前記入射した戻り光の光学的状態を検出する光学的状態検出部と、
前記接続部に接続された第2の端部を介して前記電極の電気的状態を検出する電気的状態検出部と、
前記検出された光学的状態及び前記電気的状態に基づき、前記第1の端部と前記レーザカテーテルを使って治療される被治療組織との接触状態を判別する判別部と
を具備するレーザ治療装置。 - 請求項1に記載のレーザ治療装置であって、
前記光学的状態検出部は、前記入射した戻り光の強度を検出するものであり、
前記電気的状態検出部は、前記電極の電位を検出するものであり、
前記判別部は、前記検出された光強度が弱く、前記検出された電位が低いときには、前記第1の端部と前記被治療組織との接触状態が正常であると判別し、前記検出された光強度が弱く、前記検出された電位が高いときには、前記第1の端部が前記被治療組織に埋没していると判別し、前記検出された光強度が強く、前記検出された電位が高いときには、前記レーザカテーテルが被治療組織に対して沿うように接触した状態であると判別する
レーザ治療装置。 - 第1の端部及び第2の端部を有し、前記第1の端部の先端面よりレーザ光を出入射し、前記第1の端部の外周に前記第1の端部の軸方向に沿って設けられた電極を有するレーザカテーテルと、
前記レーザカテーテルの第2の端部が接続される接続部と、
前記接続部に接続された第2の端部にレーザ光を出射する出射部と、
前記接続部に接続された第2の端部からの戻り光を入射し、前記入射した戻り光の光学的状態を検出する光学的状態検出部と、
前記接続部に接続された第2の端部を介して前記電極の電気的状態を検出する電気的状態検出部と、
前記検出された光学的状態及び前記電気的状態に基づき、前記第1の端部と前記レーザカテーテルを使って治療される被治療組織との接触状態を判別する判別部と
を具備するレーザ治療システム。 - 請求項3に記載のレーザ治療システムであって、
前記レーザカテーテルに設けられた電極は、それぞれ、リング状の電極である
レーザ治療システム。 - 第1の端部及び第2の端部を有し、前記第1の端部の先端面よりレーザ光を出入射し、前記第1の端部の外周に前記第1の端部の軸方向に沿って設けられた電極を有するレーザカテーテルの前記第2の端部にレーザ光を出射し、
前記第2の端部からの戻り光を入射して前記入射した戻り光の光学的状態を検出すると共に、前記電極の電気的状態を検出し、
前記検出された光学的状態及び前記電気的状態に基づき、前記第1の端部と前記レーザカテーテルを使って治療される被治療組織との接触状態を判別する
判別方法。
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CN2011800649986A CN103328043A (zh) | 2011-01-19 | 2011-12-22 | 激光治疗装置、激光治疗系统和判定方法 |
US13/976,801 US20130289672A1 (en) | 2011-01-19 | 2011-12-22 | Laser therapy apparatus, laser therapy system, and determination method |
KR1020137018102A KR20140022784A (ko) | 2011-01-19 | 2011-12-22 | 레이저 치료 장치, 레이저 치료 시스템 및 판별 방법 |
EP11856316.2A EP2666516A4 (en) | 2011-01-19 | 2011-12-22 | LASER THERAPY APPARATUS, LASER THERAPY SYSTEM, AND EVALUATION METHOD |
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JP5635282B2 (ja) * | 2010-03-15 | 2014-12-03 | ソニー株式会社 | 判別装置 |
JP5926806B2 (ja) | 2011-09-22 | 2016-05-25 | ザ・ジョージ・ワシントン・ユニバーシティThe George Washingtonuniversity | アブレーションされた組織を視覚化するシステムと方法 |
US9795466B2 (en) | 2012-05-30 | 2017-10-24 | Klox Technologies Inc. | Phototherapy devices and methods |
JP2015024030A (ja) | 2013-07-26 | 2015-02-05 | 株式会社アライ・メッドフォトン研究所 | 医療用具及び医療用具用の光放射プローブ取付キット |
JP2015089489A (ja) | 2013-11-07 | 2015-05-11 | 株式会社アライ・メッドフォトン研究所 | 医療用具及び光線治療装置 |
CN105744883B (zh) | 2013-11-20 | 2022-03-01 | 乔治华盛顿大学 | 用于心脏组织高光谱分析的系统和方法 |
WO2016069754A1 (en) | 2014-10-29 | 2016-05-06 | The Spectranetics Corporation | Laser energy delivery devices including laser transmission detection systems and methods |
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