CN219846546U - Convex array photoacoustic probe - Google Patents

Abstract

The embodiment of the utility model discloses a convex array photoacoustic probe, which comprises a tail end optical fiber assembly, a convex array ultrasonic assembly and an optical window assembly; the terminal optical fiber assembly comprises a plurality of terminal optical fiber bundles, and the plurality of terminal optical fiber bundles in the terminal optical fiber assembly are dispersed on two sides of the convex array ultrasonic assembly in a fan-shaped radial manner; the optical window assembly comprises a pair of optical windows symmetrically arranged at two sides of the convex array ultrasonic assembly, and the first end face of the optical window faces towards the convex array ultrasonic assembly; a second end surface of the optical window adjacent to the first end surface faces the light emergent end of the terminal optical fiber bundle; the optical window assembly is used for refracting excitation light emitted by the tail end optical fiber bundles from two sides of the convex array ultrasonic assembly towards the center, so that the distance between the converging position of the photoacoustic excitation light and the convex array photoacoustic probe falls within a preset range. The optical irradiation areas in the photoacoustic probe are uniformly distributed in the ultrasonic detection area and are overlapped with the ultrasonic detection area in height, so that the dead zone of the optical irradiation area is reduced, the light quantity in the optical irradiation area is improved, and the quality of photoacoustic imaging is improved.

Description

Convex array photoacoustic probe

Technical Field

The utility model relates to the field of photoacoustic probes, in particular to a convex array photoacoustic probe, wherein the tail ends of optical fiber bundles are distributed according to special rules and comprise special-shaped optical windows.

Background

Photoacoustic imaging is a newer biomedical imaging method, and the principle is that pulse laser is used for irradiating biological tissues, tissue absorption laser is excited to generate ultrasonic signals, and light absorption characteristic images in the tissues can be reconstructed by detecting the ultrasonic signals. At present, photoacoustic imaging can be based on the developed mature ultrasonic imaging technology, so that the photoacoustic image and the ultrasonic image are subjected to superposition matching to realize multi-mode comprehensive imaging, and functions are realized based on equipment such as a photoacoustic probe. However, photoacoustic imaging has a problem in that it is difficult to reliably and efficiently transfer a pulsed laser into a tissue to be measured in an application.

In a conventional photoacoustic probe, please refer to fig. 1, which is a schematic structural diagram of a conventional photoacoustic probe. The excitation light 1 generated by the pulse laser light source is transmitted to the tissue 3 to be measured by the optical fiber bundle 2, the optical fiber bundle 2 is divided into two branches, the two optical fiber bundles 2 are arranged at two sides of the ultrasonic probe 4, and the optical fiber bundles 2 at two sides obliquely irradiate the tissue to be measured, so that the two excitation light 1 are overlapped at a certain depth in the tissue 3 to be measured under the ultrasonic probe. However, the photoacoustic endoscope probe designed based on the design has the problems that the volume of the probe is overlarge due to the inclination of the optical fiber, the optical irradiation area is seriously misaligned with the detection area under the ultrasonic probe, the light distribution in the optical irradiation area is uneven, the photoacoustic imaging effect is poor, the photoacoustic image is difficult to be overlapped with the ultrasonic image, and the like.

In another conventional photoacoustic probe, please refer to fig. 2, which is a schematic structural diagram of another conventional photoacoustic probe. Excitation light 1 generated by the pulse laser light source is transmitted to a reflecting device 5 by an optical fiber bundle 2, and then reflected to a tissue 3 to be detected by the reflecting device 5, and the optical fiber bundle 2 is divided into two branches and arranged at two sides of an ultrasonic probe 4. The reflecting device 5 is a reflecting flat sheet or a total reflecting prism coated with a reflecting film, and the reflecting efficiency is low. If the reflection flat sheet is adopted, the reflection flat sheet tends to protrude out of the ultrasonic probe 4 when the light deflection angle is increased, so that the structure is not practical; if the total reflection prism is adopted, the total reflection of light with a large angle cannot be performed, so that the problems of insufficient light quantity and large blind area depth in the detection area of the ultrasonic probe are caused.

Disclosure of Invention

The embodiment of the utility model provides a convex array photoacoustic probe, which aims to solve the problems that in the prior art, light distribution in an optical irradiation area is uneven, the contact ratio of the optical irradiation area and an ultrasonic probe detection area is not high, the light quantity of the optical irradiation area after reflection is insufficient, the blind area depth is large, the photoacoustic imaging effect is poor, and the superposition of an optical image and an ultrasonic image is difficult.

The embodiment of the utility model provides a convex array photoacoustic probe, which comprises a tail end optical fiber assembly, a convex array ultrasonic assembly and an optical window assembly; the terminal optical fiber assembly comprises a plurality of terminal optical fiber bundles, and the plurality of terminal optical fiber bundles in the terminal optical fiber assembly are dispersed on two sides of the convex array ultrasonic assembly in a fan-shaped radial manner; the optical window assembly comprises a pair of optical windows symmetrically arranged on two sides of the convex array ultrasonic assembly, and the first end face of the optical window faces the convex array ultrasonic assembly; a second end face of the light window adjacent to the first end face faces the light exit end face of the terminal fiber bundle; the optical window assembly is shaped to refract photoacoustic excitation light emitted by a plurality of tail end optical fiber bundles in the tail end optical fiber assembly from two sides of the convex array ultrasonic assembly towards the center, so that the distance between the convergence position of the photoacoustic excitation light and the convex array photoacoustic probe falls into a preset range. The optical irradiation area in the photoacoustic probe is uniformly distributed in the ultrasonic detection area and is highly overlapped with the ultrasonic detection area, so that the dead zone of the optical irradiation area is reduced, the light quantity in the optical irradiation area is obviously improved, and the quality of photoacoustic imaging is obviously improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic block diagram of a photoacoustic probe according to the prior art;

FIG. 2 is a schematic block diagram of another prior art photoacoustic probe;

FIG. 3 is a schematic block diagram of a convex array photoacoustic probe provided by an embodiment of the present utility model;

FIG. 4 is a schematic block diagram of another angle of a convex array photoacoustic probe provided by an embodiment of the present utility model;

FIG. 5 is a schematic block diagram of a convex ultrasonic assembly of a convex photoacoustic probe provided by an embodiment of the present utility model;

FIG. 6 is a schematic diagram of excitation light emission of a convex array photoacoustic probe according to an embodiment of the present utility model;

fig. 7 is a schematic block diagram of an optical window assembly of a convex array photoacoustic probe according to an embodiment of the present utility model;

fig. 8 is a schematic view of an angle between an end optical fiber bundle and a convex ultrasonic assembly in a convex photoacoustic probe according to an embodiment of the present utility model.

Wherein, the reference numerals specifically are: the optical fiber array comprises a convex array photoacoustic probe 10, a terminal optical fiber assembly 100, a first terminal optical fiber set 110, a second terminal optical fiber set 120, a terminal optical fiber bundle 111, a convex array ultrasonic assembly 200, a piezoelectric array element 210, an optical window assembly 300, a first optical window 310 and a second optical window 320.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Referring to fig. 3, fig. 3 is a schematic block diagram of an exemplary male array photoacoustic probe 10 according to the present utility model, where the male array photoacoustic probe 10 includes a terminal optical fiber assembly 100, a male array ultrasonic assembly 200, and an optical window assembly 300; the end optical fiber assembly 100 includes a plurality of end optical fiber bundles 111, and a plurality of end optical fiber bundles 1111 in the end optical fiber assembly 100 are dispersed radially in a fan shape on both sides of the convex array ultrasonic assembly 200; the optical window assembly 300 includes a pair of curved optical windows symmetrically disposed on both sides of the convex ultrasonic assembly 200, and a first end surface of the optical window faces the convex ultrasonic assembly 200; a second end face of the light window adjacent to the first end face faces the light exit end of the terminal fiber bundle 111; a third end face of the optical window adjacent to the first end face is an emergent face of the photoacoustic excitation light; the optical window assembly 300 is configured to refract the photoacoustic excitation light emitted from the plurality of end optical fiber bundles 111 in the end optical fiber assembly 100 from both sides of the convex array ultrasonic assembly 200 toward the center such that the distance between the point where the photoacoustic excitation light is concentrated and the convex array photoacoustic probe 10 falls within a preset range.

In the present embodiment, the plurality of end optical fiber bundles 111 emit excitation light generated by a pulsed laser light source into an optical irradiation region for effective imaging. The convex array ultrasonic assembly 200 is mainly used for transmitting acoustic signals and receiving ultrasonic signal echoes carrying structural features of biological tissues to be detected and converting the ultrasonic signal echoes into electric signals, and specifically, receiving ultrasonic signal echoes generated by excitation after the biological tissues to be detected absorb excitation light. The optical window assembly 300 is mainly used for refracting and diffusing the excitation light transmitted by the plurality of end optical fiber bundles 111 in the end optical fiber assembly 100, specifically, refracting the excitation light toward a middle tangential plane of the convex array ultrasonic assembly, so as to enlarge an optical irradiation area and reduce an irradiation blind area, and increase the excitation light quantity in a detection area of the convex array ultrasonic assembly 200.

A first end face in the optical window assembly 300 is connected to the array ultrasonic assembly 200 while a second end face adjacent to the first end face is connected to the end optical fiber assembly 100, and the end optical fiber assembly 100 may be connected to the array ultrasonic assembly 200 through the optical window assembly 300 to direct excitation light into the detection region of the array ultrasonic assembly 200. Meanwhile, the excitation light emergent end of the tail end optical fiber assembly 100 is connected with the second end face, so that the excitation light can be effectively guided to the direction in which photoacoustic detection is required. The excitation light is emitted by the plurality of terminal optical fiber bundles 111 at the same time and is refracted and diffused by the optical window assembly 300, so that the optical irradiation range is effectively enlarged, more excitation light is guided into the detection range of the convex array ultrasonic assembly 200, and the quality of photoacoustic detection of deep tissues is improved.

In one embodiment, the optical windows include a first optical window 310 and a second optical window 320; between the second end face and the third end face, a thickness of the first optical window 310 on a side close to the first end face is greater than a thickness of the first optical window on a side far from the first end face; between the second end face and the third end face, the thickness of the second optical window 320 on the side close to the first end face is greater than the thickness of the second optical window on the side far from the first end face.

In this embodiment, the second optical window 320 and the first optical window 310 form an axisymmetric relationship with the convex array ultrasonic assembly 200. The first optical window 310 and the second optical window 320 are connected to the array ultrasonic assembly through respective first end surfaces. Alternatively, the first light window 310 and the second light window 320 may be made of a transparent material with high light transmittance, for example, transparent plastic or transparent glass.

Taking the first optical window 310 as an example, the first optical window 310 may be configured to have a trapezoid cross section and the edges corresponding to the four vertices of the trapezoid cross section are arc edges. The arcuate edges may include a first edge, a second edge, a third edge, and a fourth edge, wherein the first end face includes the first edge and the second edge, the second end face includes the first edge and the fourth edge, and the third end face includes the second edge and the third edge. The first end surface is an end surface of the first optical window 310 contacting the first sidewall, so the first edge and the second edge are edges near to the side of the convex ultrasonic assembly 200, and the third edge and the fourth edge are edges far from the side of the convex ultrasonic assembly 200. Accordingly, the first edge and the fourth edge are edges near the light emitting end side of the end optical fiber 111, and the second edge and the third edge are edges far from the light emitting end side of the end optical fiber 111. For circular arcs, the curvature is inversely proportional to the radius. The first curvature sum is greater than the second curvature sum, in particular meaning that the sum of the radii of the first and second edges is greater than the sum of the radii of the third and fourth edges, meaning that the difference in curvature of the first and third edges is greater than the difference in curvature of the fourth and second edges, meaning that the difference in radius of the third and first edges is greater than the difference in radius of the second and fourth edges.

Further, the sum of the curvatures of the first edge and the fourth edge is greater than the sum of the curvatures of the second edge and the third edge, i.e. the sum of the radii of the first edge and the fourth edge is smaller than the sum of the radii of the second edge and the third edge. Alternatively, the first edge radius may be made smaller than the third edge radius and the second edge radius, and the fourth edge radius may also be made smaller than the third edge radius and the second edge radius. The first optical window 310 and the second optical window 320 having the above-described shapes are constructed such that excitation light emitted from the first end optical fiber group 110 and the second end optical fiber group 120 can be refracted and diverged in a direction biased toward the detection plane of the convex ultrasonic assembly 200, so that the amount of excitation light introduced into the detection plane is increased.

In an embodiment, the optical window further has a fourth end face adjacent to the second end face, the third end face; the circle centers of the arc-shaped edge that the first end face is connected with the second end face, the arc-shaped edge that the first end face is connected with the third end face, the arc-shaped edge that the fourth end face is connected with the second end face, and the arc-shaped edge that the fourth end face is connected with the third end face are positioned on the same axis.

In this embodiment, the centers of the first edge and the second edge in the first optical window 310, the centers of the third edge and the fourth edge in the first optical window 310, the centers of the first edge and the second edge in the second optical window 320, and the centers of the third edge and the fourth edge in the second optical window 320 may be disposed on the same straight line. Wherein the first edge and the second edge are concentric arcs, and the third edge and the fourth edge are concentric arcs.

In an embodiment, the angle between the first end face and the second end face ranges between 77 ° and 83 °.

In this embodiment, in the first optical window 310 and the second optical window 320, the included angle between the first end face and the second end face is smaller than ninety degrees and is between 77 ° and 83 °, and further, the excitation light emitted by the end optical fiber bundle 111 can be refracted through the first optical window 310 and the second optical window 320, and has an angle for refraction convergence towards the middle section of the convex array ultrasonic assembly 200.

In an embodiment, referring to fig. 8, the light emitting ends of the plurality of terminal optical fiber bundles 111 are abutted to the second end surface of the optical window.

In the present embodiment, the light emitting ends of the plurality of terminal optical fiber bundles 111 are abutted to the first end face of the first optical window 310 and the first end face of the second optical window 320, specifically, the light emitting ends of the plurality of terminal optical fiber bundles 111 may be fixedly abutted to the light emitting end face of the first optical window 310 and the light emitting end face of the second optical window 320 by gluing or hot melt curing. When the excitation light is emitted from the light emitting ends of the plurality of terminal optical fiber bundles 111, the excitation light can be immediately refracted and diverged by the first optical window 310 and the second optical window 320, so that the optical irradiation blind area is effectively reduced.

The light emitting ends of the plurality of end optical fiber bundles 111 are connected to the optical window assembly 300, and accordingly, excitation light emitted by the plurality of end optical fiber bundles 111 may be refracted and diverged by the first optical window 310 and the second optical window 320. Further, the excitation light emitted from the plurality of end optical fiber bundles 111 can be expanded in light angle to form a larger range of optical irradiation area than when not refracted. Further, since the detection plane of the convex ultrasonic assembly 200 is located at the middle tangential plane of the arc-shaped detection plane, the excitation light emitted from the plurality of end optical fiber bundles 111 can uniformly irradiate on the detection plane of the convex ultrasonic assembly 200 after being refracted and diverged through the optical window assembly 300.

In one embodiment, the end fiber assembly includes a first end fiber set 110 and a second end fiber set 120 symmetrically disposed; the first end fiber group 110 and the second end fiber group 120 each include a first branching number of a plurality of end fiber bundles 111; the number of the first branches is more than or equal to 8.

In this embodiment, the first end optical fiber set 110 and the second end optical fiber set 120 may be connected to the first middle optical fiber and the second middle optical fiber, respectively, and the first middle optical fiber and the second middle optical fiber may be connected to the trunk optical fiber. The main optical fiber can be connected to the pulse laser device, so that excitation light generated by the pulse laser device is transmitted to the first middle optical fiber and the second middle optical fiber; the excitation light in the first and second midsection fibers may be uniformly transmitted into the plurality of end fiber bundles 111 in the first and second end fiber groups 110 and 120, respectively. The first ends of the plurality of terminal optical fiber bundles 111 are collectively connected to the corresponding first or second middle optical fiber to simultaneously receive excitation light from the first or second middle optical fiber. Wherein the plurality of end optical fiber bundles 111 may be sized to be the same size. Optionally, the number of the plurality of end optical fiber bundles 111 in the first end optical fiber group 110 may be set to be greater than 8 bundles, and the number of the plurality of end optical fiber bundles 111 in the second end optical fiber group 120 may be correspondingly set to be greater than 8 bundles, so as to ensure that the size of the main optical fiber is not excessively large, and prevent from causing an obstacle to entering the tissue to be inspected. Meanwhile, the number of the terminal optical fiber bundles 111 which are larger than 8 bundles is set, so that the blind area depth of an optical irradiation area is reduced, the blind area depth is reduced to be lower than 2.5 mm, superficial tissues can be effectively irradiated, photoacoustic signals are generated, and the photoacoustic imaging quality is improved.

Optionally, the transmission direction of the excitation light in the first middle section optical fiber and the second middle section optical fiber is from the first end to the second end, that is, the excitation light reaches the first end in the first middle section optical fiber and the second middle section optical fiber through the trunk optical fiber, and branches are implemented at the first end in the first middle section optical fiber and the second middle section optical fiber, and enters the first middle section optical fiber and the second middle section optical fiber simultaneously. The excitation light is conducted through the first and second middle fibers while reaching the second ends of the first and second middle fibers, and branches into the plurality of end bundles 111 in the end fiber optic assembly 100 at the second ends of the first and second middle fibers.

In an embodiment, referring to fig. 6, the plurality of end optical fiber bundles 111 in the first end optical fiber group 110 and the second end optical fiber group 120 are arranged at equal intervals, and the plurality of end optical fiber bundles 111 form the same included angle.

In this embodiment, the excitation light conducted in the plurality of end optical fiber bundles 111 in the first end optical fiber group 110 and the second end optical fiber group 120 can reach the light emitting end in the end optical fiber bundle 111 at the same time, and the excitation light is emitted from the second end in the plurality of end optical fiber bundles 111 to form the optical irradiation area. Taking the first end optical fiber group 110 as an example, the plurality of end optical fiber bundles 111 in the first end optical fiber group 110 can emit excitation light at the same time, and because the plurality of end optical fiber bundles 111 form the same included angle, the excitation light can uniformly irradiate in the optical irradiation area, so that the state of the optical irradiation area is stable and the brightness is sufficient. Correspondingly, the excitation light in the second end fiber set 120 achieves the same effect as the excitation light in the first end fiber set 110.

In one embodiment, referring to fig. 8, the plurality of end optical fiber bundles 111 form a first angle with respect to a tangential plane of the convex ultrasonic assembly 200.

In this embodiment, the middle section of the plurality of end optical fiber bundles 111 and the convex array ultrasonic assembly 200 forms an included angle smaller than ninety degrees, specifically, the middle section of the plurality of end optical fiber bundles 111 in the first end optical fiber group 110 and the convex array ultrasonic assembly 200 forms a first included angle smaller than ninety degrees, the middle section of the plurality of end optical fiber bundles 111 in the second end optical fiber group 120 and the convex array ultrasonic assembly 200 forms a first included angle smaller than ninety degrees, and the first included angle formed by each end optical fiber bundle 111 is equal.

In an embodiment, the first included angle is in the range of 7 ° to 13 °.

In this embodiment, the first included angle may be an included angle of 7 ° to 13 ° to limit the width of the convex array photoacoustic probe 10, so as to ensure that the convex array photoacoustic probe 10 can smoothly enter the tissue to be inspected.

In an embodiment, referring to fig. 6, the preset range is less than or equal to 2.5 mm.

In the present embodiment, a first blind area is formed between the point where the photoacoustic excitation light emitted from the plurality of end optical fiber bundles in the first end optical fiber group converges and the convex array photoacoustic probe 200; a second blind area is formed between the converging position of the photoacoustic excitation light emitted by the plurality of tail end optical fiber bundles in the second tail end optical fiber group and the convex array photoacoustic probe 200; the depth of the first blind zone and the depth of the second blind zone are less than 2.5 millimeters.

Since the excitation light beams emitted between the adjacent end optical fiber bundles 111 can intersect at a certain depth from the surface of the biological tissue to be detected, that is, in the biological tissue smaller than the specific depth, when the excitation light beams do not intersect, there is a light irradiation blind area, that is, a first blind area and a second blind area, which cannot be irradiated by the excitation light. When the depth of the dead zone is reduced, the imaging quality can be effectively improved. Specifically, the dead zone depth is reduced by increasing the number of end fiber bundles 111.

In one embodiment, the convex ultrasonic array assembly includes a plurality of piezoelectric array elements 210 arranged at equal intervals; the end optical fiber bundles 111 at the two fan-shaped side edges of the plurality of end optical fiber bundles 111 are disposed corresponding to the positions of the piezoelectric array elements 210 at the two side edges of the convex array ultrasonic assembly 200.

In this embodiment, the plurality of piezoelectric array elements 210 are arranged in parallel, and the arrangement intervals between the plurality of piezoelectric array elements 210 are equal. Among the plurality of terminal optical fiber bundles 111 of the first terminal optical fiber group 110, the terminal optical fiber bundles 111 positioned at the two side edges of the first terminal optical fiber group 110 are correspondingly arranged with the piezoelectric array elements 210 at the two side edges of the convex array ultrasonic assembly 200; among the plurality of end optical fiber bundles 111 in the second end optical fiber group 120, the end optical fiber bundles 111 located at two side edges of the second end optical fiber group 120 are disposed corresponding to the piezoelectric array elements 210 located at two side edges of the convex array ultrasonic assembly 200. The plurality of end optical fiber bundles 111 in the first end optical fiber group 110 form a certain angle, and the positions of the two end optical fiber bundles 111 positioned at the two side edges are matched with the positions of the two piezoelectric array elements 210 positioned at the two side edges so as to encapsulate all the piezoelectric array elements 210 in the optical irradiation area.

The embodiment of the utility model provides a convex array photoacoustic probe, which comprises a tail end optical fiber assembly 100, a convex array ultrasonic assembly 200 and an optical window assembly 300; the end optical fiber assembly 100 includes a plurality of end optical fiber bundles 111, and a plurality of end optical fiber bundles 1111 in the end optical fiber assembly 100 are dispersed radially in a fan shape on both sides of the convex array ultrasonic assembly 200; the optical window assembly 300 includes a pair of curved optical windows symmetrically disposed on both sides of the convex ultrasonic assembly 200, and a first end surface of the optical window faces the convex ultrasonic assembly 200; a second end face of the light window adjacent to the first end face faces the light exit end of the terminal fiber bundle 111; a third end face of the optical window adjacent to the first end face is an emergent face of the photoacoustic excitation light; the optical window assembly 300 is configured to refract the photoacoustic excitation light emitted from the plurality of end optical fiber bundles 111 in the end optical fiber assembly 100 from both sides of the convex array ultrasonic assembly 200 toward the center such that the distance between the point where the photoacoustic excitation light is concentrated and the convex array photoacoustic probe 10 falls within a preset range. The optical irradiation area in the photoacoustic probe is uniformly distributed in the ultrasonic detection area and is highly overlapped with the ultrasonic detection area, so that the dead zone of the optical irradiation area is reduced, the light quantity in the optical irradiation area is obviously improved, and the quality of photoacoustic imaging is obviously improved.

The present utility model is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present utility model, and these modifications and substitutions are intended to be included in the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (11)

1. The convex array photoacoustic probe is characterized by comprising a tail end optical fiber assembly, a convex array ultrasonic assembly and an optical window assembly;

the terminal optical fiber assembly comprises a plurality of terminal optical fiber bundles, and the plurality of terminal optical fiber bundles in the terminal optical fiber assembly are dispersed on two sides of the convex array ultrasonic assembly in a fan-shaped radial manner;

the optical window assembly comprises a pair of bent optical windows symmetrically arranged on two sides of the convex array ultrasonic assembly, and the first end face of the optical window faces the convex array ultrasonic assembly; a second end face of the light window adjacent to the first end face faces the light exit end of the terminal fiber bundle; a third end face of the optical window adjacent to the first end face is an emergent face of the photoacoustic excitation light; the optical window assembly is shaped to refract photoacoustic excitation light emitted by a plurality of tail end optical fiber bundles in the tail end optical fiber assembly from two sides of the convex array ultrasonic assembly towards the center, so that the distance between the convergence position of the photoacoustic excitation light and the convex array photoacoustic probe falls into a preset range.

2. The convex-array photoacoustic probe of claim 1, wherein the light window comprises a first light window and a second light window;

the thickness of the side, close to the first end face, of the first optical window is larger than the thickness of the side, far away from the first end face, of the first optical window between the second end face and the third end face;

and the thickness of the side, close to the first end face, of the second optical window is larger than that of the side, far away from the first end face, of the second optical window between the second end face and the third end face.

3. The convex-array photoacoustic probe of claim 2, wherein the optical window further has a fourth end face that is contiguous with the second end face, the third end face; the circle centers of the arc-shaped edge that the first end face is connected with the second end face, the arc-shaped edge that the first end face is connected with the third end face, the arc-shaped edge that the fourth end face is connected with the second end face, and the arc-shaped edge that the fourth end face is connected with the third end face are positioned on the same axis.

4. A convex array photoacoustic probe according to claim 2, wherein the angle between the first end face and the second end face ranges between 77 ° and 83 °.

5. The convex array photoacoustic probe of claim 2, wherein the light exit ends of the plurality of terminal fiber optic bundles are abutted to the second end face of the light window.

6. The convex array photoacoustic probe of claim 1, wherein the terminal fiber optic assembly comprises a first terminal fiber optic group and a second terminal fiber optic group symmetrically disposed; the first end optical fiber group and the second end optical fiber group each comprise a plurality of end optical fiber bundles of a first branch number; the number of the first branches is more than or equal to 8.

7. The convex array photoacoustic probe of claim 6, wherein the plurality of end optical fiber bundles in the first end optical fiber group and the second end optical fiber group are arranged at equal intervals, and the plurality of end optical fiber bundles present the same included angle.

8. The convex array photoacoustic probe of any one of claims 1 to 7, wherein the plurality of terminal optical fiber bundles present a first angle with a mid-section of the convex array ultrasound assembly.

9. The convex-array photoacoustic probe of claim 8, wherein the first included angle is in the range of 7 ° to 13 °.

10. The convex array photoacoustic probe of claim 1, wherein the preset range is 2.5 millimeters or less.

11. The convex array photoacoustic probe of claim 1, wherein the convex array ultrasonic assembly comprises a plurality of piezoelectric array elements arranged at equal intervals; and the tail end optical fiber bundles at the two side edges of the fan-shaped tail end optical fiber bundles are arranged corresponding to the positions of the piezoelectric array elements at the two side edges in the convex array ultrasonic assembly.