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Catheter system integrating ultrasonic imaging and laser ablation

An ultrasound imaging and ablation technique, which is used in the field of intravascular imaging and vascular stenosis treatment, and can solve the problems of dissection or perforation, and the inability to determine the distal end of the ablation catheter.

Active Publication Date: 2021-06-25
HARBIN MEDICAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, excimer laser ablation still has certain risks
For example, if the distal end of the ablation catheter is healthy vascular tissue, the pulsed laser may ablate the healthy tissue, causing surgical events such as dissection or perforation
Also, in the absence of guidance from imaging techniques, physicians may not be able to determine whether the distal end of the ablation catheter is in full contact with the lesion

Method used

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  • Catheter system integrating ultrasonic imaging and laser ablation
  • Catheter system integrating ultrasonic imaging and laser ablation
  • Catheter system integrating ultrasonic imaging and laser ablation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] figure 1 A schematic diagram of a catheter system integrating ultrasound imaging and laser ablation is shown. The catheter system is in the form of a catheter 100 to facilitate access to the blood vessels of the patient. The left end of the catheter 100 is called the proximal end of the catheter, and the right end of the catheter 100 is called the distal end of the catheter 200. The system includes an optical waveguide 101, an ultrasound imaging probe 102 and an ultrasound imaging probe 102. Signal channel 103. The proximal end of the optical waveguide 101 is connected to the pulsed laser light source 105 , and the distal end of the optical waveguide 101 is terminated at the end face of the distal end 200 of the catheter. The proximal end of the ultrasonic signal channel 103 is connected to the ultrasonic imaging engine 104, and the excitation signal sent from the ultrasonic imaging engine 104 is transmitted to the ultrasonic imaging probe 102 through the ultrasonic si...

Embodiment 2

[0056] Figure 4 A schematic view of the distal end surface of the catheter of a catheter system integrating ultrasound imaging and laser ablation is shown. Different from the preferred embodiment 1, the array elements 203 are arranged in a ring along the catheter wall 404 . The guidewire channel 204 remains in the middle of the catheter 100 . The optical waveguide 101 , such as but not limited to the optical fiber 202 , is closely arranged between the ultrasonic sensor array 301 and the guide wire channel 204 . The design of the ultrasonic sensor and optical fiber 202 can image the entire cross-section of the vessel wall, and the arrangement of the optical fiber 202 is also concentric with the longitudinal axis of the catheter 100 . Such a design eliminates the need to rotate the proximal end of the catheter to image different quadrants of the vessel wall or to perform ablation. However, the disadvantage of this is that the exit end surface of the optical fiber 202 is far ...

Embodiment 3

[0058] Figure 5 A schematic view of the distal end surface of another catheter system integrating ultrasound imaging and laser ablation is shown. Similar to the preferred embodiment 2, the guide wire channel 204 is still retained in the middle of the catheter 100 . The difference is that the design of this preferred embodiment allows the array elements 203 to be arranged in a ring along the outer wall of the guide wire channel 204 . The optical fibers 202 are closely arranged between the ultrasonic sensor array 301 and the catheter tube wall 404 . This design enables the end face of the optical fiber 202 to be as close to the blood vessel wall as possible, thereby ablation of the narrow tissue close to the blood vessel wall. Since the ultrasonic sensor array 301 is far away from the blood vessel wall, when controlling the ultrasonic beam, the elevation angle of the scanning surface may need to be changed, for example but not limited to 45° or 50°. Another limitation of thi...

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Abstract

The invention provides a catheter system integrating ultrasonic imaging and laser ablation. The catheter system comprises a catheter, the left end and the right end of the catheter are the catheter near end and the catheter far end respectively, an optical waveguide and an ultrasonic signal channel are arranged in an inner cavity of the catheter, the near end of the optical waveguide is connected with a pulse laser light source, and the far end of the optical waveguide ends at the end face of the catheter far end. Laser pulses emitted by the pulse laser light source are emitted from the front of the far end of the catheter through the optical waveguide and erode tissues in front of the catheter; The near end of the ultrasonic signal channel is connected with an ultrasonic imaging engine, the far end of the ultrasonic signal channel is connected with an ultrasonic imaging probe for foresight imaging, and the ultrasonic imaging probe is used for focusing and scanning imaging to assist laser ablation. Vascular ultrasonic imaging and laser ablation are combined into a catheter system, the treatment effect of the laser ablation is reserved, image guidance of the vascular ultrasonic imaging is provided, and application of the laser ablation in eccentric vascular stenosis can be improved.

Description

technical field [0001] The invention belongs to the technical field of intravascular imaging and vascular stenosis treatment, and in particular relates to a catheter system integrating ultrasonic imaging and laser ablation. Background technique [0002] Percutaneous coronary intervention (PCI) usually sends the guiding catheter to the coronary artery opening to be dilated, and then sends a balloon of the corresponding size along the guide wire to the stenotic segment, with appropriate pressure and time according to the characteristics of the lesion. Dilation, to achieve the purpose of relieving arterial stenosis, traditional treatment methods include angioplasty and stent implantation. Plaque ablation is an adjuvant cardiac interventional treatment technique, including coronary atherectomy, orbital atherectomy, and laser ablation. In recent years, Excimer Laser (Excimer Laser) intracoronary plaque ablation uses ultraviolet light source, catheter design, and pulsed emission ...

Claims

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Application Information

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IPC IPC(8): A61B18/24A61B8/08
CPCA61B18/24A61B18/245A61B8/0891A61B8/42A61B2018/2255
Inventor 于波贾海波赵晨
Owner HARBIN MEDICAL UNIVERSITY
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