EP4347010A1 - Dispositif à multi-émetteurs d'énergie laser et ensemble de traitement thermique associé - Google Patents
Dispositif à multi-émetteurs d'énergie laser et ensemble de traitement thermique associéInfo
- Publication number
- EP4347010A1 EP4347010A1 EP22717864.7A EP22717864A EP4347010A1 EP 4347010 A1 EP4347010 A1 EP 4347010A1 EP 22717864 A EP22717864 A EP 22717864A EP 4347010 A1 EP4347010 A1 EP 4347010A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser
- sheath
- target region
- optical fibers
- distal end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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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
- 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
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- A61N5/06—Radiation therapy using light
- A61N5/0613—Apparatus adapted for a specific treatment
- A61N5/0625—Warming the body, e.g. hyperthermia treatment
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/01—Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue
- A61B5/015—By temperature mapping of body part
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- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- A61N5/067—Radiation therapy using light using laser light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- A61B2018/00005—Cooling or heating of the probe or tissue immediately surrounding the probe
- A61B2018/00011—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids
- A61B2018/00023—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids closed, i.e. without wound contact by the fluid
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- 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
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- 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
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- A61N2005/0658—Radiation therapy using light characterised by the wavelength of light used
- A61N2005/0659—Radiation therapy using light characterised by the wavelength of light used infrared
Definitions
- the present invention relates to the field of treatment of a biological tissue using a localized variation of the temperature under guidance by intraoperative imaging.
- the invention relates to a device with multiple laser energy emitters capable of emitting a plurality of laser beams to induce in biological tissue a 3D temperature variation corresponding to a predefined target region of any shape. and potentially asymmetric.
- the invention also relates to a heat treatment assembly comprising such a device with multiple laser energy emitters coupled to an MRI imaging device.
- a first category of heat treatment can be distinguished, which consists in depositing a dose of energy in a target region of a biological tissue via energy-generating means positioned at a distance (focused ultrasound or radiofrequency by induction ) and a second category of thermal treatment which consists in depositing a dose of energy in the target zone by percutaneous or vascular route (radiofrequencies, laser, microwaves, cryotherapy).
- the heat treatment system of the present invention belongs to the second category.
- a so-called “preoperative planning phase” aims to evaluate the 3D extension of the target region using to appropriate imaging techniques, for example by computed tomography (which may be designated by "CT”) or by Magnetic Resonance Imaging (which may be designated by "MRI”), capable of determining the size, number, location and the shape of the target region(s).
- CT computed tomography
- MRI Magnetic Resonance Imaging
- the planning phase also aims to prepare the treatment which consists in defining the treatment instructions, namely the dose of thermal energy to be delivered in a volume according to the functional characteristics of the biological tissue to be treated, the size of the target region and the severity of the pathological tissue.
- a target region which includes the pathological tissue visible in imaging and possibly a minimum safety margin to be respected, defined by the practitioner around the pathological tissue. This target region must undergo an appropriate temperature variation in order to treat the pathological tissue.
- the target region is generally surrounded by a region whose tissue is healthy and should ideally not undergo a deleterious thermal variation during the thermal treatment.
- this region which surrounds the target region one or more critical regions to be preserved (organs and/or vital structures) can be distinguished.
- the tissues should ideally not undergo a temperature variation during the heat treatment. However, any variation in temperature is not considered critical for the patient.
- the lack of adaptability between the shape of the effective temperature distribution and the shape of the target region can lead to insufficient energy deposition in certain areas of the target region and/or possible energy deposition unwanted in a critical region to preserve.
- One of the consequences of this lack of adaptability of the shape of the lesion is the increase in the number of incomplete treatments and the associated risks of local recurrence. Similarly, the risks of altering healthy biological tissues are accentuated, increasing the risk of potentially serious side effects.
- optical fibers it is known to use an optical fiber or a set of optical fibers to deposit a dose of laser energy in contact with the target region. Indeed, the use of optical fibers makes it possible to bring its distal end into direct contact with the target region and to deposit therein the thermal energy required by absorption of light energy emitted using a laser source.
- a known exemplary embodiment is a device which comprises a main sheath integrating an optical fiber or a set of optical fibers.
- the distal end of the sheath includes an opening through which the end of the fiber optic or fiber optic assembly emits radiation light energy to locally treat the target area.
- One of the aims of the present invention is therefore to provide a transmission device having a plurality of optical fibers whose direction of transmission can be different for each fiber and dynamically adjustable during the treatment, in order to be able to create a treatment in accordance with the therapeutic objective.
- Another object of the present invention is to be able to provide a device which is capable of controlling and modulating the light power and the wavelength of each laser fiber emitted independently. Adjusting the wavelength makes it possible to modulate the depth of induced heating, since biological tissues absorb light differently depending on their wavelengths.
- Another object of the present invention is to be able to provide a device which is capable of controlling and modulating the light power and the moment of emission of each optical fiber in order to generate and adjust in real time during processing a 3D distribution with a geometric shape adapted to the geometric shape of the target region.
- Another object of the present invention is to provide a device making it possible to measure the temperature in real time at the distal end of the device, thus providing a means of measuring temperature complementary to the thermometric imaging system.
- a laser device with multiple laser energy emitters is proposed for thermally treating a target region of a biological tissue, comprising:
- At least one sheath having a longitudinal axis (AA') and comprising a proximal end and a distal end intended to face the target region;
- each of the optical fibers being adapted to guide a heat treatment laser beam towards the target region and to deposit laser energy in the region target;
- the distal ends of at least two optical fibers being configured to each emit a laser beam in a different direction of emission with respect to the longitudinal axis of the sheath;
- a system of laser sources configured to generate at least two laser beams, said at least two laser beams having different or identical wavelengths with an adjustable light power;
- a laser beam control unit configured to control the laser source system so as to select the wavelength, the light output, the duration of the laser energy deposition and the moment of emission of each of the guided laser beams and emitted by the optical fibers in the direction of the target region so as to generate and dynamically adjust a 3D thermal distribution having a geometric shape adapted to the geometric shape of the target region.
- the distal end of at least two optical fibers is positioned at a different distance relative to a surface of the distal end of the sheath.
- the distal end of the optical fibers is configured to emit a laser beam in an emission direction oriented at an angle ⁇ between 0 and 180° relative to the longitudinal axis of the sheath.
- the laser source system comprises a plurality of monochromatic laser sources.
- the laser source system is adapted to generate at least two laser beams of different laser wavelengths by optical fiber.
- the device further comprises a plurality of transmission optical fibers capable of transmitting the laser beams generated by the laser source system to the optical fibers of the sheath.
- the device further comprises a temperature sensor.
- the temperature sensor is a detection optical fiber capable of detecting a temperature variation in the target region.
- said plurality of heat treatment optical fibers is distributed according to radial symmetry around the detection optical fiber.
- the device further comprises connection means capable of connecting the optical fibers of the sheath with the transmission optical fibers of the laser source system.
- the sheath comprises at least one lumen suitable for the injection of a pressurized therapeutic substance intended to be ejected in the direction of the target region.
- the sheath comprises a closed cooling circuit suitable for transporting a cooling liquid intended to cool part of the distal end of the sheath.
- the closed cooling circuit is formed by at least two lights provided in the sheath.
- the cooling circuit is formed by a cooling sheath surrounding the sheath comprising the optical fibers and a light provided in the sheath.
- an assembly for heat treatment of a target region of a biological tissue comprising:
- a laser device with multiple laser energy emitters as defined above to treat the target region; - a magnetic resonance imaging system configured to generate anatomical images and thermometric images of the target region.
- Figure 1 shows a laser device with multiple laser energy emitters according to one embodiment of the invention
- FIG. 2 Figure 2 shows a laser device with multiple laser energy emitters according to another embodiment
- FIG. 3 schematically shows a perspective view of a sheath comprising a set of optical fibers
- Figure 4 schematically shows a side view and in section of a set of three processing optical fibers in a sheath according to an exemplary embodiment
- FIG. 5 schematically shows a perspective view of an embodiment in which the device comprises three sheaths, each of the sheaths comprises a set of five optical fibers;
- FIG. 6A shows a cross-sectional and front view of an exemplary embodiment of a sheath provided with five lumens intended to receive processing optical fibers and a sixth central lumen intended to receive a temperature sensor or to injection of coolant or therapeutic substance;
- FIG. 6B shows a cross-sectional and front view of an embodiment of a sheath of Figure 6A provided with two additional slots to form a closed cooling circuit;
- FIG. 6C shows a cross-sectional and front view of an exemplary embodiment of an optical sheath of FIG. 6A surrounded by a cooling sheath to form a closed cooling circuit with the central lumen;
- Figure 7 shows a heat treatment assembly according to one embodiment of the invention comprising a multi-emitter laser device coupled to an MRI imaging device;
- FIG. 8A schematically shows a sheath comprising six processing optical fibers capable of emitting six light energies.
- FIG. 8B shows six temperature images obtained by MRI thermometry with the sheath of Figure 8A, each temperature image being obtained simultaneously with the activation of a single optical fiber and each optical fiber being activated sequentially one after the other ;
- FIG. 8C Figure 8C shows a temperature image obtained with the sheath of Figure 8A, during the simultaneous activation of the six optical fibers with the same power;
- FIG. 9 Figure 9 schematically shows an example of use with two sheaths whose distal ends are positioned on either side of a target region;
- Figure 10 schematically shows an embodiment of a laser source system that can generate two laser beams of different wavelengths per processing optical fiber.
- FIG. 11 Figure 11 schematically shows a front view of a laser source system comprising six optical fibers.
- Figure 12 shows photographs of the individual laser beams emitted by each of the six optical fibers in Figure 11.
- FIG. 13 shows temperature images obtained by MRI thermometry during a sequential activation of each of the optical fibers and the curves of the graph show the evolution of the temperature in six pixels, each pixel being selected in an angular sector covered through a different fiber optic.
- FIG. 14 shows temperature images obtained by MRI thermometry for three different activation configurations generating three geometric shapes of thermal distribution: triangle (a), ellipse (b), and semicircle (c), each image displayed being chosen at the moment of the end of the laser emission, corresponding to the maximum elevation of the temperature by the selected diodes, the numbered points indicated on each image are the pixels selected to display the time evolution curves of the temperature on the graphs on the right. Definitions
- target region means a region comprising the pathological tissue to be treated visible in imaging and a region which surrounds the pathological tissue.
- the extent of the neighborhood around the pathological tissue is defined by the practitioner.
- the target region must undergo a temperature variation in order to treat the pathological tissue.
- the region is denoted by Rc in Figure 7.
- a 3D anatomical image is a reconstructed image representing the anatomy of the target region and its environment. This 3D anatomical image can be obtained by different imaging techniques.
- a 3D temperature image is a 3D image representative of a spatial distribution of the temperature of the target region and of the region which surrounds it.
- the 3D temperature image is obtained by an MRI magnetic resonance imaging device, using a temperature-sensitive imaging sequence and a real-time image processing device that calculates and displays temperature variations in the target region and the region surrounding it.
- proximal denotes a part or part of the device which is located close to the operator or the practitioner when the latter uses the device
- distal denotes a part or a part of the device which is away from the operator during this use.
- the invention will more particularly be described in the case of a heat treatment of a target region and of a temperature variation detection during the heat treatment.
- This is however not limiting, insofar as the system can be used in conjunction with the injection of a treatment solution or other types of fluids, introduced into a lumen of the sheath provided for this purpose.
- FIG. 1 schematically represents a device with multiple laser energy emitters 1 according to one embodiment of the invention.
- the device 1 comprises a plurality of optical fibers 123, 124, 125, 126, 127, 128 intended to transport a plurality of laser beams towards a target region of a biological tissue, a system of laser sources 19 and a unit control main 10.
- the laser source system 19 is configured to generate a plurality of laser beams intended to be injected into the optical fibers and guided by the optical fibers towards the target region.
- a part of the plurality of laser beams is intended to irradiate the target region so as to induce a temperature variation and/or to activate molecules present in a solution previously deposited in the target region.
- the main control unit 10 is configured to control the laser source system 19 so as to select the wavelength, the light power, the duration of the laser energy deposition and the moment of emission of each of the laser beams. treatment for each of the optical fibers.
- the device also comprises one or more temperature sensors whose function is to measure the temperature of the target region in contact with the sheath.
- the temperature sensor is formed by one of the optical fibers and at least one laser beam among the plurality of laser beams emitted by the optical fibers is intended to detect a variation in the temperature of the target region during heat treatment.
- the laser beam control unit 10 is also configured to receive a detection laser beam coming from this optical fiber dedicated to temperature measurement.
- the temperature sensor can for example be a thermocouple inserted into one of the openings of the sheath.
- the thermocouple is connected to the laser beam control unit 10.
- the optical fibers 123, 124, 125, 126, 127, 128 are held in a sheath 150 which has the function of holding the optical fibers together.
- the sheath 150 is in the form of a flexible or rigid body, depending on the targeted therapeutic application, of substantially cylindrical shape having a longitudinal axis AA′.
- the sheath comprises a proximal end 151 and a distal end 152 intended to face the target region.
- the sheath 150 is made of a material compatible with a surgical intervention and adapted to let the light beams emitted by the optical fibers pass.
- the sheath is provided with lumens and each of the lumens encloses an optical fiber which extends between the distal end 152 and the proximal end 151 of the sheath 150.
- the sheath is in the form of an end piece capable of being connected in a detachable manner to the system of laser sources 19.
- the sheath has, for example, an external diameter of 1.8 mm and a diameter 1.2 mm internal.
- the sheath can be covered with a protective surface which can darken due to the absorption of the light ray, it will be possible to change the protective surface without changing the set of optical fibers.
- the processing and detection optical fibers have a diameter of between 50 ⁇ m and 1000 ⁇ m, preferably between 100 and 400 microns.
- the five optical fibers 123, 124, 125, 126, 127 are, for example, processing optical fibers each capable of transmitting a light beam having a wavelength suitable for processing the target region
- the sixth optical fiber 128 is a detection fiber and has the function of measuring a temperature variation of the target region.
- the optical fibers intended to transmit a light beam dedicated to the heat treatment are designated by the term "treatment fiber” or "transmitter” and the optical fiber dedicated to the detection of a temperature variation by the term “sensing fiber”.
- the five light beams emitted by the five emitters or treatment fibers can each cover, for example, an angular sector at an angle of 72°, so as to emit according to a complete revolution of 360°.
- the sheath 150 can comprise ten optical transmitters which each make it possible to cover an angular sector of 36°.
- the number of transmitters is not limiting.
- the example arrangement shown in Figures 1, 2, 3 and 4 is not limiting and may vary according to need.
- the distal end of each of the treatment fibers can be positioned at different distances L relative to the distal end of the sheath, making it possible to modulate the relative position of each of the optical fibers in the direction of the length of the sheath.
- each of the emitters is configured so as to emit a light beam oriented in a different direction.
- the distal end of each of the optical fibers is for example polished so as to emit a laser beam whose direction of emission is oriented at an angle a defined with respect to the main axis AA' of the optical fiber. This angle can be between 0° and 180°. It is thus possible to obtain a set of optical fibers capable of emitting a set of light beams which each illuminate a predefined angular sector.
- the combination of the different light beams emitted by the distal end of each of the emitters with a different direction of emission and at different distal positions along the sheath makes it possible to generate lesions of dimensions and geometries adapted to the shape of the target region.
- Figure 4 shows an example of sheath 150 comprising three treatment fibers or transmitters 123, 124, 125.
- the distal end of each of the treatment transmitters 123, 124, 125 is respectively positioned at a different distance L1, L2 , L3 relative to the distal end 152 of the sheath.
- Each of the emitters emits a light beam in a different direction, thus covering a different angular sector.
- Each of the three directions is defined here by a different angle a1, a2, cr3 comprised between the axis of symmetry of the beam and the main axis AA' of the optical fiber.
- the angle a can be between 0° and 180°.
- the device may also comprise a plurality of optical ducts.
- the device may comprise for example three optical sheaths 210, 220, 230.
- Each of the optical sheaths 210, 220, 230 here comprises for example respectively five processing optical fibers 211, 212, 213, 214, 215, 221, 222, 223, 224, 225, 231, 232, 233, 234, 235 and a central detection optical fiber 216, 226, 236.
- the light beams transported by the fibers of the same set can by example have different wavelengths, different powers, different emission durations and different emission times.
- they may have different emission directions and different distal emission positions along the sheath.
- the sheath comprises five slots 153, 154, 155, 156, 157 arranged in radial symmetry around a central slot 158.
- the peripheral slots 153, 154, 155, 156, 157 are each intended, for example, to receive a processing optical fiber.
- the central lumen 158 of the sheath is intended to pass the temperature sensor, for example an optical detection fiber 128 or a thermocouple whose function is to measure the temperature. This temperature measurement makes it possible to check any deviation between the temperature measured at the end of the optical fiber and the temperature measured by an MRI Magnetic Resonance imaging device.
- a known technique consists in using an optical fiber provided with a Bragg grating inscribed in the heart of the fiber.
- the Bragg grating consists of a periodic and longitudinal modulation of the refractive index of the single mode fiber core.
- the Bragg grating reflects light at the Bragg wavelength.
- the fiber undergoes a relative elongation as well as a variation in refractive index, which results in a variation in the reflected wavelength.
- the sheath comprises an additional lumen which makes it possible to convey, for example, a therapeutic solution intended to be deposited in the target region.
- the injected solution is a solution comprising for example molecules that can be activated by temperature, for example anticancer agents encapsulated in a heat-sensitive nanovehicle.
- the emitters or the treatment fibers each emit a light beam in the direction of the target region in order to thermally activate the molecules of the solution.
- the sheath 150 may comprise two slots 159, 160 intended for the circulation of a cooling liquid by forming a closed circuit and another slot 158 intended to deliver a therapeutic substance.
- Port 160 is for the coolant inlet and port 159 for the coolant return.
- the central port 158 can be used as a cooling fluid inlet and the two other ports 159, 160 as a cooling fluid return. All three lights form a closed circuit.
- the optical sheath 150 which comprises the set of optical fibers is surrounded by a cooling sheath 161.
- the cooling fluid arrives via the central lumen 158 and is returned via the cooling duct 161 .
- This configuration of the cooling circuit makes it possible to have more homogeneous cooling over the entire distal part of the sheath.
- the lumen comprises an inlet orifice located on a proximal end surface of the sheath and an outlet or injection orifice on the surface of the distal end. of the sheath.
- the inlet port is connected to a piston intended to inject the therapeutic substance into the lumen provided for this purpose.
- the injection rate of the solution flowing through the lumen is controlled so that the therapeutic substance can be directed and ejected towards the target region.
- Other embodiments are possible in order to eject the substance in the target region.
- the laser source system 19 is adapted to generate a plurality of laser beams for the thermal treatment of the target region and possibly the detection of a temperature variation in the case where the temperature sensor is an optical fiber.
- the number of laser beams generated by the laser source system 19 is not limiting. According to an exemplary embodiment and with reference to FIG. 10, the laser source system 19 can generate, for example, two laser beams of different wavelength per processing optical fiber 123, 124, 125, 126, 127. Thus, for the device of FIG. 1 which comprises five treatment optical fibers and one detection optical fiber 128, the laser source system is configured to generate ten treatment laser beams and one detection laser beam.
- the laser beams generated for each optical fiber can have identical or different wavelengths and light powers.
- the laser source system 19 generates two laser beams for each processing optical fiber, it is therefore possible to select one of the two wavelengths A1 or K2 and one of the two light powers of the processing light beam transported and emitted by the processing optical fiber.
- the laser beams are generated by means of a plurality of monochromatic laser sources.
- Each of the monochromatic laser sources generates a light beam at a given wavelength.
- the use of a plurality of treatment wavelengths makes it possible to adjust the depth of penetration of the beam into the tissue of the target region.
- the source system comprises six laser diodes 23, 24, 25, 26, 27, 28 to generate five treatment laser beams and a detection laser beam, each of the beams possibly having her own wavelength and its own luminous power.
- the source system can also comprise for example three diodes which emit at 976 nm and three diodes which emit at 793 nm.
- Each of the diodes is associated with its own power supply unit 13, 14, 15, 16, 17, 18 and can be controlled individually by an electronic control unit 12.
- the system may comprise a plurality of monochromatic laser sources, for example laser diodes, associated with each optical fiber.
- monochromatic laser sources for example laser diodes
- the central control unit 10 is connected to the electronic control unit 12 in order to transmit control signals to the control unit 12 to drive the diodes individually and independently of each other.
- the central control unit 10 comprises a laser beam control unit 31 and a display unit 32.
- the beam control unit 31 is configured to send the control signals to the electronic control unit 12 to adjust the heat treatment parameters for each of the laser beams which are the wavelength, the duration of the emission of the laser beam, the moment of emission of the laser beam and the light power of the laser beam.
- the laser beam control unit 31 also receives data from a temperature measurement acquisition unit measured by a temperature sensor, for example by the distal end of a detection fiber or by a thermocouple.
- the temperature measurement acquisition unit is housed in the source system 19.
- the display unit 32 makes it possible to display these temperature data coming from the temperature sensor.
- the beam control unit 31 is configured to select the light power of the laser beam transmitted to each of the transmitters. In the case where there are for example two laser beams generated by optical fiber, it is possible to select for example one of the two light powers for each optical fiber.
- the laser beam control unit 31 is configured to select the wavelength of the light beam conducted and emitted by each of the emitters in order to be able to modulate the depth of penetration of the laser beam into the tissue of the target region. In the case where there are for example two laser beams generated by optical fiber, it is possible to select for example one of the two wavelengths for each optical fiber.
- the beam control unit 31 is configured to select the duration of emission of each treatment fiber and the moment of emission of each treatment fiber so as to generate a thermal distribution with a specific geometric shape, adapted in particular to the geometric shape of the target region to induce a temperature variation. According to an exemplary embodiment, it is possible to activate the processing optical fibers sequentially or simultaneously for part of the processing optical fibers. Possible usage examples are shown in Figures 8A-8C, Figures 11-14.
- each of the three processing optical fibers conducts and emits a light beam having its own light power P1, P2, P3, its own wavelength l1, l2, A3 , and its own emission duration t1, t2, t3. It is also possible to envisage three different emission times and three different emission durations for the three processing optical fibers.
- the optical fibers are adapted to each transport a laser beam from the proximal end of the sheath to the distal end of the sheath.
- the proximal end of the optical fibers of the sheath is connected to the laser source system 19 by connections provided for this purpose in the proximal zone of the sheath and which will be detailed below.
- Figure 1 schematically shows an example of connection connectors intended to connect the optical fibers and the laser source system 19.
- the connection connectors are shown detached from one of the other.
- the sheath 150 comprises at its proximal end a single connector 130 intended to engage in a connection connector 30 of the laser source system 19.
- the light beams generated by the laser source system 19 are guided by a plurality of optical transmission fibers 43, 44, 45, 46, 47, 48 towards the optical connector 30.
- the optical transmission fibers are fibers equivalent to the optical fibers in the sheath, and can be of the same structure. The use of these transmission optical fibers makes it possible to install the laser source system 19 and the main control unit 10 in a room far from the room containing the MRI imaging device. Once the sheath is positioned in the patient's body by the practitioner, the latter can use the central control unit 10 to adjust the various parameters of the laser beam during the treatment phase.
- transmission fibers makes it possible to route the light beams from the control part to a distance close to the patient, thus making it possible to jointly use the device with multiple laser energy emitters of the present invention.
- invention with an MRI device without creating interference between the MRI device and the electronic components of the laser source system 19.
- the length of the transmission optical fibers is between 10 meters and 15 meters.
- the transmission optical fibers are protected by a plastic sheath in order to protect them against any possible external disturbance.
- the connector 130 of the sheath 150 comprises connection lugs on a flat connection surface.
- the source system connector 30 includes connection ports on a connection surface.
- the connection lugs are capable of being introduced into the orifices to bring the two connection connectors into engagement.
- the connecting tabs are introduced into the holes, the two connecting surfaces are in contact so that the ends of the optical fibers of the sheath come into contact respectively with the ends of the transmission optical fibers to connect the optical fibers between them.
- the optical connectors are mutually engageable to optically couple the plurality of optical fibers from the sheath to the plurality of transmission optical fibers of the laser source system 19.
- the sheath 150 is thus detachably connected to the laser source system 19 via the optical connectors 30, 130 which allow easy manual connection and disconnection.
- the connectors are made in such a way as to be compatible with MRI.
- Figure 2 illustrates another example of optical connection between the optical sheath 150 and the source system 19.
- the processing and detection optical fibers are each provided at their proximal end with an individual optical connector 133, 134, 135, 136, 137, 138, and the transmission optical fibers are also provided at their distal end with an individual optical connector 33, 34, 35, 36, 37, 38.
- the connectors allow easy manual connection and disconnection between cladding and source system 19.
- the device with multiple laser energy emitters of the present invention can be integrated into a heat treatment assembly.
- such a heat treatment assembly comprises:
- an MRI 50 imaging device configured to provide 3D anatomical images of the target region as well as temperature images of the target region throughout the duration of the treatment.
- the assembly also includes an image construction unit 51 configured to provide 3D anatomical images and 3D temperature images from the data acquired by the MRI device.
- an image construction unit 51 configured to provide 3D anatomical images and 3D temperature images from the data acquired by the MRI device.
- the central control unit 10 of the multi-transmitter device and the image construction unit 51 can be integrated into a single and same entity.
- the display unit 32 of the central control unit 10 is connected to the image construction unit 51 and also makes it possible to display the temperature images in real time during the treatment and the measurements of temperature transmitted by the temperature sensor of the multi-transmitter device 1 .
- unit display 32 comprises a data entry interface, thus allowing the practitioner to enter data to adjust the wavelength, the light power, the duration of emission and the moment of emission of each of the light beams generated by the system of laser sources and intended to be transported and emitted by the optical fibres.
- the target region is a region in which the biological tissue must undergo a temperature variation. This region must be of an appropriate size to ensure the destruction of all of the pathological tissue while preserving the tissues in the vicinity of the target region.
- the evaluation of the spatial extension of the target region is carried out by the practitioner in a phase called “preoperative planning phase” from data relating to anatomical images of the target region. This phase also makes it possible to determine the complex geometric shape and the location of the target region.
- FIG. 7 there is schematically represented an organ comprising a target region, called Rc, surrounded by healthy regions.
- the practitioner defines an intervention strategy which consists in defining:
- FIGS. 8A, 8B and 8C two examples of possible use of the same optical cladding are described.
- Figure 8A schematically illustrates an optical sheath 150 with a radial distribution of six optical fibers positioned at the distal end of the sheath. Each of the optical fibers is able to emit a laser beam numerically referenced F1, F2, F3, F4, F5 and F6.
- Figure 8B shows six temperature images obtained by the MRI imaging device.
- Each temperature image is obtained simultaneously with the activation of a single optical fiber, each optical fiber being activated sequentially one after the other.
- the temperature images clearly show six heated zones in distinct angular sectors.
- the temperature distributions around the optical cladding are more or less extensive, due to a different power delivered on each optical fiber.
- Figure 8C shows a temperature image obtained during simultaneous activation of all six optical fibers with the same power.
- the temperature image shows a substantially circular temperature rise around the optical cladding 150.
- each of the sheaths 240, 250 comprises here for example respectively three optical fibers 241, 242, 243, 251, 252, 253. Thanks to the technical solution of the present invention, it is thus possible to activate only the two optical fibers 241, 242, 251, 252 whose laser beams are emitted in the direction of the target region, and to leave inactive the third optical fiber whose emitted laser beam covers an angular sector situated in a healthy region to be preserved from the biological tissue. In addition, it is also possible to select a different wavelength, light power and laser energy deposition time for each of the four emitted laser beams so that a 3D thermal distribution that matches the geometric shape can be generated. 3D of the target region.
- the laser device comprises six optical fibers, encapsulated in a single sheath.
- the diameter of each optical fiber is 200 ⁇ m and the final cladding diameter is 2 mm.
- the distal end of each fiber has been machined to ensure radial propagation of each individual laser beam in a different direction, to provide 60° angular coverage for each fiber, with all six fibers distributed in 360° radial symmetry .
- each laser fiber is connected to a laser diode having a wavelength of 976 nm and a power of 9 W maximum.
- Each laser diode is individually controlled by a laser beam control unit configured to control the laser diodes so as to dynamically adjust the wavelength, light output, duration of laser energy deposition, and timing of emission of each of the laser beams guided and emitted by the optical fibers in the direction of the target region during the shot. This adjustment is possible at the start of transmission by the control unit and can be adjusted during transmission.
- Figure 12 shows six photographs of the individual emission beams of each optical fiber of the device of Figure 11. Each individual laser beam is visualized by connecting a laser diode in the visible range, for example at a wavelength of 532 nm.
- the operation of the laser device of FIG. 11 is then validated by MRI thermometry.
- the distal end of the fibers surrounding by the sheath, called the probe here, is introduced into a gel containing gelatin.
- the assembly is positioned in the center of a magnetic resonance imaging device (MRI) operating at 1.5T. Marking imaging is performed in order to visualize the probe and the gel, and to position the thermometry sections perpendicular to the axis of the probe, encompassing the area illuminated by all the fibers.
- MRI temperature imaging is performed with a fast gradient echo sequence (“Echo planar imaging” technique) and comprises 10 slices (resolution in the plane of 1.4 mm, slice thickness of 3 mm) which are recorded continuously (dynamic imaging) over a total duration of several minutes with a frequency of 2 second refresh.
- the parameters of the thermometry acquisition technique are: echo time of 18 ms, field of view of 180x180 mm2, tilt angle of 60°, GRAPPA acceleration by a factor of 2, bandwidth by 1446 Hz pixel.
- the images are processed in real time by a calculation unit to obtain temperature maps from phase images. These temperature maps are displayed in real-time color code in a graphical interface. Characteristic points can be identified on the image to select one or more of the pixels in which the temporal evolution of the temperature will also be displayed.
- each diode is supplied sequentially at a power of 4.2 W for 30 seconds, with a pause of 10 seconds between the emission of each diode.
- FIG. 13 shows six temperature images obtained by MRI during a sequential activation of each emitter channel, at the instant corresponding to the stopping of the emission of each of the six optical fibers (maximum rise in temperature ). For each image is indicated the angular sector covered by the fiber, for the activated diode.
- the graph on the right shows the evolution of the temperature in six pixels referenced 1 from 1 to 6, each pixel being selected in an angular sector covered by a different fiber.
- the results show a rise in temperature in different angular sectors for each fibre, in agreement with FIG. 12 (qualitative characterization of the laser emission).
- the temperature rise is less pronounced for fiber number 5 (angular sector 2p/3 in figure 13), in agreement with the photo of the illumination produced by this fiber in figure 12.
- the graph on the right shows the evolution into six different pixels positioned in each of the six angular sectors covered by each of the fibers.
- a sequential rise in temperature is observed as a function of the activated laser diode.
- FIG. 14 shows three results obtained by differently activating the laser diodes supplying each of the optical fibers, in order to generate a thermal distribution in the shape of a triangle, ellipse or semi-circle.
- Figure 14 shows three temperature images (a), (b) and (c) obtained by MRI thermometry for three different activation configurations.
- the temperature variation in the heated region is represented by a gray level variation displayed to the left of images.
- Configuration (a) corresponds to simultaneous activation of three fibers 2, 4 and 6, with a power of 2W and for a duration of 60 seconds.
- the temperature image has a triangle shape.
- Configuration (b) corresponds to simultaneous activation of two fibers 3 and 6, with a power of 1.5 W and for a duration of 25 seconds.
- the temperature image has an ellipse shape.
- Configuration (c) corresponds to simultaneous activation of four fibers 1, 2, 3 and 6, with a power of 1.5 W and for a period of 30 seconds.
- the temperature image has a semi-circle shape.
- the use of a plurality of laser energy emitters, each covering a different angular sector and at different positions along the sheath, makes it possible to generate a 3D temperature distribution adjustable with respect to the geometric shape any of the target region. Due to this flexibility on the geometry of the thermal lesion created, the invention is particularly suitable for a treatment of cardiac fibrillations, for treating tumors of various organs, such as the abdomen and pathological brain regions.
- control is more precise in terms of depth of penetration of the light beam into the tissue of the target region by modulating the wavelength of the beams emitted by each of the emitters.
- the device with multiple laser energy emitters is coupled with an MRI imaging device in a heat treatment assembly, it is possible to modulate the light power, the duration of emission as well as the moment of emission of each of the emitters in order to adjust the deposition of laser energy in time and in space from the temperature images obtained by the MRI imaging device.
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Abstract
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2105430A FR3123194B1 (fr) | 2021-05-25 | 2021-05-25 | Dispositif à multi-émetteurs d’énergie laser et ensemble de traitement thermique associé |
| PCT/FR2022/050564 WO2022248778A1 (fr) | 2021-05-25 | 2022-03-25 | Dispositif à multi-émetteurs d'énergie laser et ensemble de traitement thermique associé |
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| EP4347010A1 true EP4347010A1 (fr) | 2024-04-10 |
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| EP (1) | EP4347010A1 (fr) |
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| KR (1) | KR20240026935A (fr) |
| CN (1) | CN117615818A (fr) |
| FR (1) | FR3123194B1 (fr) |
| WO (1) | WO2022248778A1 (fr) |
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| US12527625B2 (en) | 2021-10-22 | 2026-01-20 | Gyrus Acmi, Inc. | Characterizing tissue using fluorescence emission |
| DE102022126810A1 (de) * | 2021-10-22 | 2023-04-27 | Gyrus Acmi, Inc. D/B/A Olympus Surgical Technologies America | Laser-kombination mit in-vivo-ziel feedback-analyse |
| CN119055350A (zh) * | 2023-05-23 | 2024-12-03 | 华科精准(北京)医疗设备股份有限公司 | 消融光纤、消融光纤组件和激光消融系统 |
| FR3161119A1 (fr) | 2024-04-15 | 2025-10-17 | Certis Therapeutics | Système et procédé de régulation automatique de la température pour un équipement de thermothérapie laser multi-émetteurs à guidage par IRM |
| CN119523619A (zh) * | 2024-11-28 | 2025-02-28 | 广东省新兴激光等离子体技术研究院 | 基于空间多焦点的激光消融装置及激光诊疗一体化装置 |
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| US12514456B2 (en) * | 2013-01-31 | 2026-01-06 | Eximo Medical Ltd. | System and methods for lesion characterization in blood vessels |
| WO2015006309A1 (fr) * | 2013-07-10 | 2015-01-15 | Christoph Scharf | Dispositifs et méthodes de distribution d'énergie thérapeutique |
| US10687895B2 (en) * | 2015-11-06 | 2020-06-23 | The University Of Akron | Integrated fiber optic probe for performing image-guided laser induced thermal therapy |
| US11684420B2 (en) * | 2016-05-05 | 2023-06-27 | Eximo Medical Ltd. | Apparatus and methods for resecting and/or ablating an undesired tissue |
| AU2019449734B2 (en) * | 2019-06-04 | 2025-12-18 | Pavel V. Efremkin | Laser device for vascular and intrabody surgery and method of use |
| DE112020003751T5 (de) * | 2019-08-05 | 2022-04-28 | Gyrus Acmi, Inc. D/B/A Olympus Surgical Technologies America | Lichtwellenleiteranordnung |
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- 2022-03-25 EP EP22717864.7A patent/EP4347010A1/fr active Pending
- 2022-03-25 CN CN202280037332.XA patent/CN117615818A/zh active Pending
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| KR20240026935A (ko) | 2024-02-29 |
| US20240261023A1 (en) | 2024-08-08 |
| FR3123194B1 (fr) | 2025-02-07 |
| CN117615818A (zh) | 2024-02-27 |
| JP2024522954A (ja) | 2024-06-24 |
| WO2022248778A1 (fr) | 2022-12-01 |
| JP7650038B2 (ja) | 2025-03-24 |
| FR3123194A1 (fr) | 2022-12-02 |
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