Visual optical fiber ablation system

Abstract

The invention discloses a visual optical fiber ablation system which comprises an illumination ablation catheter channel, an imaging channel and a working channel. A light guide ablation optical fiber is arranged in the illumination ablation catheter channel, the illumination ablation catheter channel is provided with an illumination white light / ablation laser interface, illumination white light and ablation laser share the same light path, the illumination white light / ablation laser interface is connected with a tunable filter, and the tunable filter is connected with a light source through the light guide optical fiber; the imaging channel is located between the inner wall of the bright ablation catheter channel and the outer wall of the working channel, a plurality of image transmitting optical fiber bundles are arranged in the imaging channel, the front ends of the image transmitting optical fiber bundles are connected with the objective lens, and the rear ends of the image transmitting optical fiber bundles are connected with the imaging platform. The system has the technical effects and advantages that accurate visual control in the ultraviolet laser ablation operation process can be realized by transmitting images through the optical fiber image transmitting bundle, and the ablation efficiency is hardly influenced. Illumination white light and ablation laser share the same light path, the structural design is more reasonable, and the machining difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber ablation, and more particularly to a visualized optical fiber ablation system. Background Art

[0002] The body's blood vessels often become blocked or obstructed by plaque, clots, other deposits or emboli, which can reduce the blood-carrying capacity of the vessel. If the blockage occurs in a critical part of the circulatory system, it can cause severe and permanent damage or even death. To prevent this, some form of medical intervention is usually performed when a significant occlusion is detected.

[0003] Ultraviolet laser ablation procedures are one of the more common interventions, and when a laser atherectomy procedure is performed in a patient's vasculature and utilizes a disposable fiber optic catheter, the catheter is typically coupled to a laser generator, such as the CVX-300TM UV Laser System manufactured by Spectranetics Corporation, Colorado Springs, CO, USA.

[0004] At present, there are two solutions for ultraviolet laser ablation: 308nm excimer laser ablation system and 355nm ultraviolet solid laser ablation system. Excimer laser is a short-wavelength cold laser of 308nm. Its shallow ablation depth and reduced unnecessary tissue damage ensure its safety. It is precisely because of these excellent characteristics that excimer laser has broad application prospects in cardiovascular treatment. However, it has limited effect on some partially calcified or completely calcified blood vessels, and there is a risk of vascular perforation. The main reason is that the 308nm excimer laser used in the laser ablation system has a large pulse width (usually 125 nanoseconds-200 nanoseconds), resulting in low laser peak power and significant thermal effect.

[0005] The 355nm UV solid laser ablation system that has emerged in recent years has obvious advantages: the laser is smaller, so the integrated machine is small in size and light in weight; the cost is lower; the working laser has a shorter pulse width (5ns), and the peak power of the 355nm UV solid laser is 25-40 times that of the 308nm excimer laser for the same laser energy, which can effectively ablate calcified lesions; at the same time, the laser energy required for the treatment effect is also lower, the thermal effect is small, and the risk of vascular perforation is reduced. In addition, Joseph A. et al. studied the mechanism of action of UV laser on calcified lesions through in vitro experiments, and confirmed that the laser in the 355nm band can effectively "vaporize" the collagen part in calcified lesions. At the same time, the instantaneous "explosive" force generated by the "vaporization" of the collagen component turns the phosphate part in the calcified lesions into tiny debris, thereby achieving the erosion of local calcified lesions. However, the quality of 355nm UV solid laser beam is close to that of fundamental mode Gaussian beam, and it is easy to focus into a very small Gaussian spot with a diameter of micrometers. Therefore, the 355nm UV solid laser ablation system is highly dependent on precise and safe control of the laser ablation process.

[0006] In the existing technology, the position of the ablation fiber in ultraviolet laser ablation mainly depends on B-ultrasound and ultrasonic positioning, which cannot accurately grasp the position of the ablation fiber. This is also a problem faced by the precision treatment technology of ultraviolet laser ablation.

[0007] Patent CN 113197663B proposes a lateral laser ablation catheter system that combines visualization technology with an ultraviolet solid laser ablation system to solve the problem of precise positioning of the ablation optical fiber. Unfortunately, the ablation system in the lateral laser ablation catheter system only accounts for half of the laser ablation catheter, which greatly weakens the efficiency of the laser ablation surgery. In addition, in extreme cases, the laser ablation catheter needs to be rotated by at most 90° to aim the ablation laser at the ablation target, thereby ablating targets such as plaques, thrombi, and other deposits, which is difficult to operate. Summary of the invention

[0008] In order to overcome the above-mentioned defects of the prior art, the present invention provides a visualized optical fiber ablation system.

[0009] The technical solution of the present invention is as follows: A visualized fiber optic ablation system, comprising an illumination ablation catheter channel, an imaging channel, and a working channel; The illumination ablation catheter channel contains a light-guiding ablation optical fiber, and the illumination ablation catheter channel is provided with an illumination white light / ablation laser interface, the illumination white light and the ablation laser share the same optical path, the illumination white light / ablation laser interface is connected to a tunable filter, and the tunable filter is connected to a light source via a light-guiding optical fiber; The imaging channel is located between the inner wall of the ablation catheter channel and the outer wall of the working channel. A plurality of image transmission fiber bundles are arranged in the imaging channel. The front end of the image transmission fiber bundle is connected to the objective lens, and the rear end of the image transmission fiber bundle is connected to the imaging platform. The imaging platform is connected to the computer terminal to present the image of the lesion on the display screen for medical personnel to observe and perform subsequent processing. The working channel is located inside the illuminated ablation catheter channel, and the working channel is used to facilitate the entry, operation and exit of medical devices.

[0010] The light-guiding ablation optical fiber has a transmission light beam that can transmit light with a wavelength of 10nm to 5000nm. The light source incident section connector is a universal connector that can be connected to ultraviolet lasers and other laser systems. When performing a vascular ablation operation, the laser is transmitted to the lesion through the ablation optical fiber to perform laser ablation on the target tissue.

[0011] By adjusting the central wavelength of the tunable filter to 308nm / 355nm and the half-width, and adjusting the power of the light source to 60mJ / mm 2 , so that the light beam transmitted by the light-guiding ablation optical fiber is adjusted from illuminating white light to ablation laser, thereby performing laser ablation surgery.

[0012] The diameter of the imaging fiber bundle is 0.35 mm and contains 10,000 imaging fibers, which can perform subcellular imaging.

[0013] The single fiber diameter of the light-guiding ablation optical fiber is 0.12 mm.

[0014] The image transmission optical fiber bundle is connected with an image interface, the image interface is connected to the CCD, and the CCD transmits the image to the computer.

[0015] The working channel has a diameter of 1 mm.

[0016] Technical effects and advantages of the present invention: It is possible to achieve precise visual control during UV laser ablation surgery by transmitting images via the fiber optic imaging bundle without affecting the ablation efficiency.

[0017] The illumination white light and ablation laser share the same optical path, the structural design is more reasonable, and the processing difficulty is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Front end cross-section of Figure 3 for Figure 1 Middle AA section view. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1

[0020] A visualized optical fiber ablation system comprises an illumination ablation catheter channel 1, an imaging channel 3, and a working channel 2; The illumination ablation catheter channel 1 contains a plurality of light-guiding ablation optical fibers 11, and the illumination ablation catheter channel is provided with an illumination white light / ablation laser interface 12. The illumination white light and the ablation laser share the same optical path. The illumination white light / ablation laser interface is connected to a tunable filter 13, and the tunable filter is connected to a light source 14 via a light-guiding optical fiber. The imaging channel 3 is located between the inner wall of the ablation catheter channel and the outer wall of the working channel. A plurality of image transmission fiber bundles 31 are arranged in the imaging channel. The front end of the image transmission fiber bundle is connected to the objective lens 32, and the rear end of the image transmission fiber bundle is connected to the imaging platform 33, i.e., CCD. The imaging platform is connected to the computer terminal 34, and the image of the lesion is presented on the display screen for medical personnel to observe and perform subsequent processing. The working channel is hollow and is used for assisting the entry, operation and exit of medical devices.

[0021] Preferably, the image transmission optical fiber bundle is connected with an image interface, the image interface is connected to the CCD, and the CCD transmits the image to the computer PC.

[0022] The light-guiding ablation optical fibers 11 in the illumination ablation catheter channel 1 are distributed in a ring shape, and the ends are gathered together and connected to the illumination white light / ablation laser interface. Embodiment 2

[0023] As shown in the figure, Figure 2 The middle of the center is the working channel, which is hollow inside to facilitate the entry, operation and exit of collaborative medical devices.

[0024] In some embodiments, the diameter of the imaging fiber bundle is 0.35 mm and contains 10,000 imaging fibers, capable of performing subcellular level imaging. The single fiber diameter of the light-guiding ablation fiber is 0.12 mm.

[0025] The illumination white light and ablation laser share the same optical path. The light from the illumination light source is connected to the tunable filter through the light-guiding optical fiber. When using white light illumination, the tunable filter is in a full-pass state and the central wavelength is not set. The illumination white light of the light source is guided by the light-guiding optical fiber into the incident port of the tunable filter and then emitted from the outlet of the tunable filter. It is guided from the outlet of the tunable filter to the light-guiding ablation optical fiber again through the light-guiding optical fiber, and finally transmitted to the lesion to illuminate the area to be observed. The reflected light is then collected by the image transmission optical fiber bundle and transmitted to the imaging platform, and finally presented on the display screen for medical personnel to observe the image of the lesion and confirm the location of the ablation catheter. The position of the light-guiding ablation optical fiber is precisely adjusted according to the image information to prepare for subsequent ablation surgery. After confirming that the light-guiding ablation optical fiber has reached the target position, the central wavelength of the tunable filter is adjusted to 308nm / 355nm and the half-width, and the power of the light source is adjusted to 60mJ / mm 2 , so that the light beam transmitted by the light-guiding ablation optical fiber is adjusted from illuminating white light to ablation laser, thereby performing laser ablation surgery.

[0026] The light-guiding ablation optical fiber has the function of transmitting light beams and can transmit light with a wavelength of 10nm~5000nm. The connector of the light source incident section is a universal connector that can be connected to ultraviolet lasers and other laser systems. When performing vascular ablation surgery, the laser passes through the ablation optical fiber and is transmitted to the lesion to perform laser ablation on the target tissue.

[0027] After laser ablation is completed, the transmission light beam is adjusted from ablation laser to illumination white light by adjusting the tunable filter and transmitted to the lesion. The reflected light is then collected by the image transmission fiber bundle and transmitted to the imaging platform, and finally presented on the display screen for medical staff to observe the image of the lesion and perform subsequent processing.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A visual fiber ablation system, characterized by: It includes an illumination ablation catheter channel, an imaging channel, and a working channel; The illumination ablation catheter channel contains a plurality of light-guiding ablation optical fibers, and the illumination ablation catheter channel is provided with an illumination white light / ablation laser interface, the illumination white light and the ablation laser share the same optical path, one end of the illumination white light / ablation laser interface is connected to the light-guiding ablation optical fiber, and the other end is connected to a tunable filter, and the tunable filter is connected to a light source via the light-guiding optical fiber; The imaging channel is located between the inner wall of the ablation catheter channel and the outer wall of the working channel. A plurality of image transmission fiber bundles are arranged in the imaging channel. The front end of the image transmission fiber bundle is connected to the objective lens, and the rear end of the image transmission fiber bundle is connected to the imaging platform. The imaging platform is connected to the computer terminal to present the image of the lesion on the display screen for medical personnel to observe and perform subsequent processing. The working channel is hollow and is located inside the illumination ablation catheter channel.

2. A visualized optical fiber ablation system according to claim 1, characterized in that: The light-guiding ablation optical fiber has the function of transmitting light beams and can transmit light with a wavelength of 10nm to 5000nm. The light source incident section connector, i.e., the illumination white light / ablation laser interface, is a universal connector that can be connected to ultraviolet lasers and other laser systems. When performing vascular ablation surgery, the laser is transmitted to the lesion through the ablation optical fiber to perform laser ablation on the target tissue.

3. A visualized optical fiber ablation system according to claim 1, characterized in that: By adjusting the central wavelength of the tunable filter to 308nm / 355nm and the half-width, and adjusting the power of the light source to 60mJ / mm 2 , so that the light beam transmitted by the light-guiding ablation optical fiber is adjusted from illuminating white light to ablation laser, thereby performing laser ablation surgery.

4. A visualized optical fiber ablation system according to claim 1, characterized in that: The diameter of the imaging fiber bundle is 0.35 mm and contains 10,000 imaging fibers, which can perform subcellular level imaging.

5. A visualized optical fiber ablation system according to claim 1, characterized in that: The single fiber diameter of the light-guiding ablation optical fiber is 0.12 mm.

6. A visualized optical fiber ablation system according to claim 1, characterized in that: The image transmission optical fiber bundle is connected with an image interface, the image interface is connected to the CCD, and the CCD transmits the image to the computer.

7. The visualized optical fiber ablation system according to claim 1, characterized in that: The working channel has a diameter of 1 mm.

8. The visualized optical fiber ablation system according to claim 1, characterized in that: The light-guiding ablation optical fibers in the channel of the illumination ablation catheter are distributed in a ring shape, and the ends are aggregated together and connected to the illumination white light / ablation laser interface.

Images