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CN-122004775-A - Piezoelectric driving micro optical probe for cerebral vascular intervention imaging

CN122004775ACN 122004775 ACN122004775 ACN 122004775ACN-122004775-A

Abstract

The invention relates to the technical field of medical instruments, in particular to a piezoelectric driving micro optical probe for cerebral vascular interventional imaging, which comprises a glass tube matrix, a single piezoelectric ceramic plate and the like, wherein the glass tube matrix is of a hollow cylindrical structure, an inclined groove is arranged in the axial center of the glass tube matrix, and the single piezoelectric ceramic plate is fixed on the outer side of the glass tube matrix. According to the invention, through a hollow rod type stator structure formed by a single piezoelectric ceramic piece and a glass tube matrix with a 10-degree inclined groove, the mode conversion from longitudinal vibration to longitudinal-torsional coupling vibration is realized, an elliptical motion track is formed at the miniature magnetic ring at the front end of the stator, a friction driving rotor is used for realizing 360-degree optical scanning, a plurality of ceramic, complex wires or metal stators are not needed, and the diameter of the probe is usually larger than 1.5mm compared with that of a traditional far-end miniature probe.

Inventors

  • WANG BAIQUAN
  • CHENG YUQI
  • WEI WENFENG
  • WU YUHUI
  • LUO JIAKAI
  • CHU JINYUAN
  • FENG JINGUANG
  • GONG ZIHAN
  • FENG YU

Assignees

  • 广州职业技术大学

Dates

Publication Date
20260512
Application Date
20260312

Claims (9)

  1. 1. The piezoelectric driving micro optical probe for cerebral vascular interventional imaging is characterized by comprising a micro probe stator (1), a micro probe rotor (2) and a single mode optical fiber (3), wherein the micro probe stator (1) comprises a glass tube substrate (12), a single-chip piezoelectric ceramic sheet (11) and a micro magnetic ring I (13), the glass tube substrate (12) is of a hollow cylindrical structure, an inclined groove is formed in the axial center of the glass tube substrate (12), the single-chip piezoelectric ceramic sheet (11) is fixed on the outer side of the glass tube substrate (12), and the micro magnetic ring I (13) is fixed at the front end of the glass tube substrate (12); The miniature probe rotor (2) comprises a rotary lens (21) and a miniature magnetic ring II (22), the miniature magnetic ring II (22) is fixed at the rear end of the rotary lens (21), and the miniature probe rotor (2) is arranged inside the front end of the glass tube matrix (12) and is coaxially aligned with the single-mode optical fiber (3); the single piezoelectric ceramic piece (11) generates longitudinal vibration under the excitation of alternating voltage, longitudinal torsion mode conversion is realized through the inclined groove of the glass tube substrate (12), an elliptical motion track is formed at the miniature magnetic ring I (13), and the miniature magnetic ring II (22) is driven by friction to drive the rotary lens (21) to realize 360-degree optical scanning; The miniature magnetic ring I (13) and the miniature magnetic ring II (22) provide precompression between a stator and a rotor through magnetic attraction and realize probe navigation through interaction with an external magnetic field; The glass tube substrate (12) is of an inclined groove structure, so that longitudinal vibration generated by the single piezoelectric ceramic plate (11) is converted into longitudinal waves and Zhou Xiangbo through reflection and propagation, an elliptical motion track is synthesized at the end part of the glass tube substrate (12), and the micro probe rotor (2) is driven to rotate through friction, so that full-view optical scanning is realized.
  2. 2. A piezo-electrically driven micro-optical probe for cerebral vascular interventional imaging according to claim 1, wherein the glass tube substrate (12) has an outer diameter of 0.3 to 0.5mm and an inner diameter of 0.181 to 0.190mm, and the inclined grooves are single inclined grooves of 10 ° to 15 °.
  3. 3. A piezo-electrically driven micro-optical probe for cerebral vascular interventional imaging according to claim 1, wherein the monolithic piezo-ceramic plate (11) has a thickness of 0.11mm to 0.15mm, vibrates along d31 mode, and is fixed to the outside of the glass tube substrate (12) by epoxy bonding.
  4. 4. A piezo-electrically driven micro-optical probe for cerebral vascular interventional imaging according to claim 1, wherein the rotary lens (21) is a 35 ° to 45 ° chamfer optical micro-lens, the outer diameter is 0.181 to 0.190mm, the length is 0.5 to 1mm, the micro-lens is closely attached to the end face of the single-mode optical fiber (3), and the coaxial alignment is realized by using the hollow structure of the glass tube substrate (12).
  5. 5. A piezo-electrically driven micro-optical probe for cerebral vascular interventional imaging according to any one of claims 1-4, wherein the micro-magnetic ring I (13) and the micro-magnetic ring II (22) are made of neodymium-iron-boron permanent magnet materials, and are respectively fixed at the front end of the glass tube substrate (12) and the rear end of the rotary lens (21) by epoxy resin, and the magnetization directions are arranged along the axial direction or the radial direction, so that mutual magnetic attraction is realized to provide adjustable pre-compression.
  6. 6. A piezo-electrically driven micro-optical probe for cerebral vascular interventional imaging according to claim 5, wherein the linear adjustment of the pre-compression force is achieved by adjusting the thickness or magnetic strength of the micro-magnetic ring II (22).
  7. 7. The piezoelectric driven micro-optical probe for cerebral vascular interventional imaging according to claim 6, further comprising a probe driving wire (14), wherein the probe driving wire (14) is connected to the monolithic piezoelectric ceramic plate (11) for transmitting a single-phase alternating current driving signal.
  8. 8. The piezoelectric driving micro optical probe for cerebral vascular interventional imaging according to claim 7, further comprising a transparent protection tube (4), wherein the transparent protection tube (4) is coated outside the probe to provide biocompatibility protection.
  9. 9. A piezo-electrically driven micro-optical probe for cerebral vascular interventional imaging according to claim 1, wherein the single-mode optical fiber (3) is used for transmitting optical signals with wavelength of 1200nm to 1400nm, and the 35 ° to 45 ° chamfer slope of the rotating lens (21) is used for laterally reflecting optical signals to realize 360 ° intravascular wall scanning.

Description

Piezoelectric driving micro optical probe for cerebral vascular intervention imaging Technical Field The invention relates to the technical field of medical instruments, in particular to a piezoelectric driving micro optical probe for cerebral vascular interventional imaging. Background In modern medicine, cerebrovascular diseases such as aneurysms, vascular stenosis, and thrombosis are the main causes of serious complications such as stroke, and intravascular interventional imaging techniques have become a key means for diagnosis and treatment. Intravascular Optical Coherence Tomography (OCT) imaging techniques are widely used in the coronary and carotid fields due to their high resolution, but pose serious challenges when applied to complex networks of cerebral vessels, especially middle cerebral arteries. The cerebral vessel branches are dense, the bending is severe, the pipe diameter is small (the middle artery branch diameter is often smaller than 0.5 mm), and extremely high requirements are provided for the diameter, flexibility and navigation capability of the interventional catheter. The existing intravascular interventional imaging catheter is mainly divided into a proximal driving type and a distal miniature probe type. The proximal drive catheter relies on mechanical transmission, as disclosed in patent CN213155792U, and an intravascular OCT-IVUS dual catheter imaging system, the rotational retraction drive device uses only one set of rotational retraction units to control the OCT or IVUS catheter, which can simplify structural components, make imaging clear, and simplify operation. However, the device is easy to generate non-uniform rotation distortion (NURD) artifacts in highly tortuous cerebral vessels due to non-uniform torque transmission of the catheter, and image distortion is caused. The distal micro probe is as in patent CN107411708a, and provides an optical coherence tomography and photoacoustic imaging dual-mode endoscope, and a built-in micro electromagnetic motor is used for driving, although NURD artifacts can be effectively avoided, conventional piezoelectric or electromagnetic driving schemes usually require multiple pieces of piezoelectric ceramics, complex wire layout or metal stators, so that the diameter of the probe is difficult to further miniaturize (usually larger than 0.5 mm), and meanwhile, wire artifacts are introduced, and the alignment of optical components depends on additional fixing pieces, so that signal attenuation and the rigid length of the probe are increased, and flexibility and navigation performance in a narrow cerebral blood vessel are affected. In addition, the existing distal micro probe has engineering difficulty in the aspect of pre-pressure application, namely, for piezoelectric actuators with the diameter smaller than 1mm, the traditional spring or mechanical pre-tightening mode is difficult to realize stable and controllable pre-pressure, so that the driving efficiency is low or unstable. The existing magnetic navigation technology (such as a magnetic control capsule endoscope) is like patent CN120130901A, and a magnetic control capsule endoscope steering control device and method based on a rotation strategy are provided, although the navigation without guide wires can be realized through an external magnetic field, the mechanical damage to the inner wall of a cavity is reduced, but the magnetic navigation technology is mainly used for a capsule device with a larger volume (the diameter is usually larger than 8 mm), is difficult to be directly applied to a cerebral vessel miniature probe which needs 360 DEG high-speed optical scanning, is not effectively integrated with a far-end piezoelectric driving scanning mechanism, and cannot simultaneously meet the requirements of microminiaturization, high-precision imaging and precise magnetic control navigation. In order to overcome the defects, the invention introduces a micro magnetic ring structure on the basis of the traditional single-chip piezoelectric driving micro optical probe to realize the magnetic controllable application of the pre-pressure, and simultaneously combines an external magnetic field to realize the flexible magnetic navigation of the probe, thereby obviously improving the navigation capacity and the safety of the probe in the tortuous and stenosed cerebral vessels, keeping the miniaturization advantage of the diameter smaller than 0.4mm and realizing the high-precision 360-degree full-view imaging for eliminating the artifacts. Disclosure of Invention In order to overcome the defects of the prior art, the invention provides a piezoelectric driving micro optical probe for cerebral vascular interventional imaging, which is used for solving the problems in the prior art. The application provides a piezoelectric driving micro optical probe for cerebral vascular interventional imaging, which adopts the following technical scheme: A piezoelectric driving micro optical probe for cerebral