CN215348819U

CN215348819U - Variable-focus photoacoustic endoscope probe

Info

Publication number: CN215348819U
Application number: CN202120312794.0U
Authority: CN
Inventors: 雷鹏; 黄德群; 陈军; 顾珩
Original assignee: Institute Of Health Medicine Guangdong Academy Of Sciences
Current assignee: Institute Of Health Medicine Guangdong Academy Of Sciences
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2021-12-31
Anticipated expiration: 2031-02-03

Abstract

The utility model discloses a variable-focus photoacoustic endoscope probe, which comprises a probe shell, and an optical fiber, a motion module, an optical lens, a reflector and an ultrasonic transducer which are positioned in the probe shell and sequentially arranged; the motion module has the function of driving the optical fiber to move in the probe shell. According to the embodiment of the utility model, the movement module drives the optical fiber to move so as to change the distance between the tail end of the optical fiber and the optical lens, so that the optical focus of the laser output by the optical fiber is adjusted, the optical focus of the photoacoustic endoscopic probe can be irradiated onto the tissue to be detected under various conditions, the variable-focus photoacoustic endoscope is realized, the photoacoustic image with high resolution is obtained, and the practicability is high. The embodiment of the utility model can be widely applied to the technical field of photoacoustic endoscopes.

Description

Variable-focus photoacoustic endoscope probe

Technical Field

The utility model relates to the technical field of photoacoustic endoscopes, in particular to a variable-focus photoacoustic endoscope probe.

Background

Photoacoustic endoscopic imaging generates photoacoustic signals by irradiating a biological tissue with focused pulsed laser light, and obtains photoacoustic images from the photoacoustic signals. The existing photoacoustic endoscopic technology mainly introduces pulse laser through optical fiber and carries out photoacoustic signal excitation on the focusing emission of the pulse laser; the common photoacoustic endoscope is mainly an endoscope system with a fixed optical focus, and mainly focuses laser output by an optical fiber through a focusing optical lens, and focused laser with different output focal lengths can be obtained according to different parameters of the selected focusing lens.

Photoacoustic endoscopic imaging is mainly applied to diagnosis of diseases of the digestive tract system and intravascular imaging at present, because the photoacoustic endoscope is difficult to control after entering the digestive tract system or blood vessels, and the vessel wall is not regular and round; for the fixed focus photoacoustic endoscope probe, because the position of the endoscope entering the tissue is unknown, the distance from the tail end of the probe to the tissue is uncertain, the distance to the tissue is also uncertain during rotation, and the light focus of the pulse laser output by the fixed focus probe can be right on the tissue and can also be out of focus. A high-resolution photoacoustic image can be obtained for the case where the optical focus is on the tissue; however, a high-resolution photoacoustic image cannot be obtained for the case of defocus.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the embodiments of the present invention is to provide a variable focus photoacoustic endoscope probe, which can adapt to the characteristic of irregular tissue to be detected, and excite focused laser to the tissue to be detected with high efficiency, so as to obtain a photoacoustic image with high resolution, and has strong practicability.

The embodiment of the utility model provides a variable-focus photoacoustic endoscope probe which comprises a probe shell, and an optical fiber, a motion module, an optical lens, a reflector and an ultrasonic transducer which are arranged in the probe shell in sequence; the motion module has the function of driving the optical fiber to move in the probe shell.

Optionally, the moving module includes a fixed module, an elastic component, a traction slider, and a control line, the elastic component connects the fixed module and the traction slider, the control line connects the elastic component, the traction slider is adjacent to the optical lens, and the fixed module is located at the tail of the probe housing; and the traction sliding block is fixedly connected with the optical fiber.

Optionally, the resilient member comprises a memory alloy spring.

Optionally, the optical lens includes any one of a spherical lens, a self-focusing lens, a gradient index lens, a convex lens, and a cemented lens.

Optionally, the optical fiber includes any one of a single mode optical fiber and a multimode optical fiber.

Optionally, the optical fiber, the motion module, the optical lens, and the mirror are coaxial.

Optionally, the ultrasonic transducer is located opposite the focal point of the laser light emitted through the mirror.

Optionally, an ultrasound transducer lead is further included, the ultrasound transducer lead being connected to the ultrasound transducer.

The implementation of the embodiment of the utility model has the following beneficial effects: according to the embodiment of the utility model, the movement module drives the optical fiber to move so as to change the distance between the tail end of the optical fiber and the optical lens, so that the optical focus of the laser output by the optical fiber is adjusted, the optical focus of the photoacoustic endoscopic probe can be irradiated onto the tissue to be detected under various conditions, the variable-focus photoacoustic endoscope is realized, the photoacoustic image with high resolution is obtained, and the practicability is high.

Drawings

Fig. 1 is a schematic structural diagram of a variable-focus photoacoustic endoscope probe according to an embodiment of the present invention.

Detailed Description

The utility model is described in further detail below with reference to the figures and the specific embodiments.

Specifically, the optical lens is used for focusing the pulse laser output by the optical fiber, and when the distance between the pulse laser output by the optical fiber and the optical lens is different, the position of the light focus output after being focused by the optical lens is also different.

Specifically, the pulse focusing laser output by the optical lens passes through the reflecting mirror to realize laser side-out.

The working principle of the variable-focus photoacoustic endoscope probe is as follows: laser output by the optical fiber is focused by the optical lens and then is emitted to a tissue to be detected through the reflector to generate a photoacoustic signal, the photoacoustic signal is received by the ultrasonic transducer to generate an electric signal, and a photoacoustic image is generated through the electric signal in the later period; wherein, the motion module can drive the optic fibre and remove in order to change the distance between optic fibre end and the optical lens to the realization is adjusted the light focus of optic fibre output laser, makes the light focus of the endoscopic probe of optoacoustic under the multiple condition all can shine on waiting to examine the tissue, obtains the optoacoustic image of high resolution.

Particularly, in the course of the work, when the photoacoustic endoscope probe that can zoom and then examine tissue and carry out the optoacoustic formation of image, can be according to received light acoustic signal or image signal and through the focus position that the formation of image probe is peeped in to the optoacoustic that the motion module changes for the tissue of examining of the different positions of distance probe can both be aroused by the focused beam and obtain the high-resolution image result of whole tissue.

Specifically, the elastic part is contracted or expanded by changing the electric signal on the control line, so that the traction sliding block is driven to move, the traction sliding block further drives the optical fiber on the traction sliding block to move, and the distance between the tail end of the optical fiber and the optical lens is adjusted.

Optionally, the resilient member comprises a memory alloy spring.

Specifically, when the elastic component is a memory alloy spring, the current signal on the control line is changed to realize the contraction or expansion of the memory alloy spring.

Specifically, the optical fiber, the motion module, the optical lens and the reflector are coaxial, so that on one hand, laser output by the optical fiber can irradiate the center of the optical lens to obtain a better focusing effect; on the other hand, eccentricity does not occur during rotation, so that a photoacoustic signal of laser of the tissue to be examined can be better obtained.

In particular, the relative position may be understood as the focused laser focus emitted through the mirror is located above the ultrasound transducer, so that the photoacoustic signal of the laser may be better received by the ultrasound transducer.

Specifically, the function of the transducer lead is to use the electric signal of the ultrasonic transducer for outputting to the signal amplification and acquisition device at the rear end, and the transducer lead is located at the bottom of the whole probe shell and does not affect other components. In addition, the ultrasonic transducer can output the electric signal to a signal amplification and acquisition device at the rear end through a wireless signal.

The variable-focus photoacoustic endoscope probe is described below with an embodiment, as shown in fig. 1, the variable-focus photoacoustic endoscope probe includes a probe housing 10, and an optical fiber 1, a motion module, an optical lens 6, a reflector 7, an ultrasound transducer 8, and an ultrasound transducer lead 9, which are located inside the probe housing 10 and are sequentially placed; the movement module consists of a fixed module 2, a memory alloy spring 3, a traction sliding block 5 and a control line 4, wherein the memory alloy spring 3 is connected with the fixed module 2 and the traction sliding block 5, the control line 4 is connected with the memory alloy spring 3, the traction sliding block 5 is adjacent to the optical lens 6, and the fixed module 2 is positioned at the tail part of the probe; the traction sliding block 5 is fixedly connected with the optical fiber 1; the movement module realizes the contraction or expansion of the memory alloy spring 3 through the current signal adjustment of the control line 4, drives the traction sliding block 5 to move, and the traction sliding block 5 further drives the optical fiber 1 to move, so as to change the distance between the tail end of the optical fiber and the optical lens; the ultrasonic transducer lead 9 is connected with the ultrasonic transducer 8, and the ultrasonic transducer 8 outputs an electric signal through the ultrasonic transducer lead 9.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A variable-focus photoacoustic endoscope probe is characterized by comprising a probe shell, and an optical fiber, a motion module, an optical lens, a reflector and an ultrasonic transducer which are positioned in the probe shell and sequentially arranged; the motion module has the function of driving the optical fiber to move in the probe shell.

2. The variable focus photoacoustic endoscope probe of claim 1, wherein the motion module comprises a fixed module, an elastic member, a traction slider, and a control wire, the elastic member connecting the fixed module and the traction slider, the control wire connecting the elastic member, the traction slider being adjacent to the optical lens, the fixed module being located at the tail of the probe housing; and the traction sliding block is fixedly connected with the optical fiber.

3. The variable focus photoacoustic endoscopic probe of claim 2, wherein the resilient member comprises a memory alloy spring.

4. The variable focus photoacoustic endoscopic probe of claim 2, wherein the optical lens comprises any one of a spherical lens, a self-focusing lens, a gradient index lens, a convex lens, and a cemented lens.

5. The variable focus photoacoustic endoscopic probe of claim 2, wherein the optical fiber comprises any one of a single mode fiber and a multimode fiber.

6. The variable focus photoacoustic endoscopic probe of any of claims 1-5, wherein the optical fiber, the motion module, the optical lens, and the mirror are coaxial.

7. The variable focus photoacoustic endoscopic probe of any of claims 1-5, wherein the ultrasound transducer is located at a relative position to the focal point of the laser light emitted through the mirror.

8. The variable focus photoacoustic endoscopic probe of any of claims 1-5, further comprising an ultrasound transducer lead connected to the ultrasound transducer.