CN109662731B - Phased array power ultrasonic device with two-dimensional imaging probe in center - Google Patents
Phased array power ultrasonic device with two-dimensional imaging probe in center Download PDFInfo
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- CN109662731B CN109662731B CN201910137188.7A CN201910137188A CN109662731B CN 109662731 B CN109662731 B CN 109662731B CN 201910137188 A CN201910137188 A CN 201910137188A CN 109662731 B CN109662731 B CN 109662731B
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4483—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer
- A61B8/4488—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer the transducer being a phased array
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/42—Details of probe positioning or probe attachment to the patient
- A61B8/4209—Details of probe positioning or probe attachment to the patient by using holders, e.g. positioning frames
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/42—Details of probe positioning or probe attachment to the patient
- A61B8/4272—Details of probe positioning or probe attachment to the patient involving the acoustic interface between the transducer and the tissue
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4444—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device related to the probe
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2437—Piezoelectric probes
- G01N29/245—Ceramic probes, e.g. lead zirconate titanate [PZT] probes
Abstract
The invention discloses a phased array power ultrasonic device with a two-dimensional imaging probe at the center, which comprises a coupling water bag, a supporting structural member, a phased array power transducer and a two-dimensional area array ultrasonic imaging probe, wherein the coupling water bag is used as a waterproof full-wrapping structural member to wrap the upper side and the peripheral side of the supporting structural member, the upper surfaces of the coupling water bag and the supporting structural member are both curved surfaces, the upper surface of the supporting structural member is provided with a positioning groove for installing the phased array power transducer, the middle part of the supporting structural member is provided with a through hole for installing the two-dimensional area array ultrasonic imaging probe, and the two-dimensional area array ultrasonic imaging probe is installed at the center of the through hole and is sealed by glue. The invention utilizes the heat generated by ultrasonic focusing to treat the relevant region, so that the temperature of the region is raised to a certain value and lasts for a period of time to achieve the treatment purpose; compared with the mode of rotation and translation, the ultrasonic imaging probe has no mechanical control, is simpler to assemble and has better resolution consistency when synthesizing images.
Description
Technical Field
The invention relates to a phased array power ultrasonic device with a two-dimensional imaging probe at the center, and belongs to the technical field of medical appliances.
Background
With the rapid development of ultrasound in the medical field, power ultrasound is increasingly being used as a therapeutic tool, and imaging ultrasound is used for diagnosis and monitoring while power ultrasound is being used. One common device is to configure the imaging guidance probe in a bottom center position of the power ultrasound device. The power ultrasonic device emits focused power ultrasonic waves from outside to inside of a human body, and forms larger energy aggregation in a specific area in the human body so as to change the biological characteristics of tissues in the area, thereby achieving the aim of treating diseases.
The power ultrasonic device is generally spherical crown-shaped, and when the power focusing transducer is in coupling contact with a human body through a water sac, the bottom of the transducer is at a certain distance from the surface of the human body. Because the ultrasonic imaging probe has high frequency, the attenuation in the body can be increased along with the increase of the distance, so the imaging probe needs to extend out for a distance to shorten the distance between the imaging probe and the human body as much as possible when the imaging probe is used before treatment; when the treatment is carried out, the imaging probe is retracted to the bottom in order to not block the power ultrasonic waves; the distance between the imaging probe retracted to the bottom and the target area is increased, and the imaging image quality is reduced, so that the real-time observation effect is affected. The imaging ultrasonic probe generally uses a convex array or a linear array phased array, and mechanical scanning is needed during diagnosis or monitoring; the existing two-dimensional area array phased array imaging probe is complex in process, and for diagnosing and monitoring a relatively large area, processing of a large-scale two-dimensional area array imaging probe is more difficult.
In conclusion, the consistency of the existing power focusing ultrasonic module is difficult to ensure; the imaging probe is arranged at the bottom of the curved surface center of the power probe, is far away from the target area, and attenuates to increase imaging quality deterioration; the loss of power ultrasound is caused by the fact that the imaging probe is at the central position; and the existing two-dimensional area array ultrasonic probe has complex process and is difficult to manufacture large-scale area arrays.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a phased array power ultrasonic device with a two-dimensional imaging probe at the center.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the phased array power ultrasonic device with the two-dimensional imaging probe in the center is characterized in that: the device comprises a coupling water bag, a supporting structural member, a phased array power transducer and a two-dimensional area array ultrasonic imaging probe, wherein the coupling water bag is used as a waterproof full-package structural member to wrap the upper side and the surrounding side of the supporting structural member, the upper surfaces of the coupling water bag and the supporting structural member are both curved surfaces, the upper surface of the supporting structural member is provided with a positioning groove for installing the phased array power transducer, the middle part of the supporting structural member is provided with a through hole for installing the two-dimensional area array ultrasonic imaging probe, and the two-dimensional area array ultrasonic imaging probe is installed in the center of the through hole and sealed by using glue or sealed in a mechanical assembly mode.
Further, the phased array power transducer is formed by arranging a plurality of groups of even-numbered cylindrical piezoelectric arrays and a plurality of groups of odd-numbered cylindrical piezoelectric arrays (but not limited to the arrangement mode of the odd-numbered or even-numbered arrays).
Furthermore, the even-numbered cylindrical piezoelectric arrays and the odd-numbered cylindrical piezoelectric arrays are embedded with piezoelectric columns which are randomly distributed or uniformly distributed, and the piezoelectric column arrays are arranged on the supporting piece and are arranged in a circular arc curved surface.
Furthermore, the radius of curvature of a quasi-line in a single curved surface of the phased array power transducer is 5cm-30cm, the curvature is matched with the curved surface of the body surface of the treatment area, the total number of primitives is 64-16384, and the center frequency is 0.2MHz-10MHz.
Further, the coupling agent is filled in the coupling water bag and serves as an acoustic propagation transition medium between the phased array power transducer and the coupling water bag, and the coupling water bag is made of a material conforming to biocompatibility; the coupling agent is deaerated water or deaerated water solution, and can flow circularly through an external peristaltic pump.
Further, the material of the supporting structural member is any one of stainless steel, aluminum, plastic or epoxy material.
Further, the two-dimensional area array ultrasonic imaging probe comprises an acoustic lens (the acoustic lens can be omitted), a matching layer, a piezoelectric composite material layer, a backing layer, a flexible circuit board and a probe shell, wherein the probe shell is of a hollow structure which is communicated up and down, a rear cover is arranged at the bottom of the probe shell, strip-shaped grooves are formed in the periphery of the rear cover, and the matching layer, the piezoelectric composite material layer, the flexible circuit board and the backing layer are sequentially arranged inside the probe shell from top to bottom.
Furthermore, the piezoelectric composite material layer adopts a piezoelectric composite material with a 1-3/2-2 structure which is used for transmitting and receiving piezoelectric ceramics or takes the piezoelectric ceramics as a substrate, and the upper surface and the lower surface of the piezoelectric composite material layer are plated with gold, silver, copper or nickel; the front and back sides of the piezoelectric composite material layer are provided with double-sided electrodes consisting of front electrodes and back electrodes, and the two sides of the piezoelectric composite material layer are provided with edge wrapping electrodes, wherein the front electrodes are divided into N rows, the back electrodes are divided into M columns, the edge wrapping electrodes are divided into N rows, the front N rows of electrodes are led to the two outermost rows of electrodes on the back side through the edge wrapping electrodes, and each electrode is divided along a kerf and according to parameters of a main array element.
Furthermore, the top end of the back lining layer is provided with a boss, and the side surfaces of the periphery are provided with clamping grooves; the middle of the flexible circuit board is hollowed out, the size of the middle groove is matched with the boss of the backing layer, the periphery of the flexible circuit board extends outwards and can be bent downwards, the flexible circuit board is clamped in the clamping grooves around the backing layer after bending, the depth of the clamping grooves around is consistent with the thickness of the flexible circuit board, and the flexible circuit board penetrates out of the strip-shaped grooves around the rear cover after bending.
Further, the bonding pads on the flexible circuit board are in one-to-one correspondence with the electrodes of the M x N type piezoelectric composite material layer, and the boss of the backing layer is adhered to the bottom of the piezoelectric composite material layer.
The beneficial effects of the invention are as follows:
the surface of the supporting structural member is of a single-curved surface structure, and the curvature of the supporting structural member is variable to match different body surface curved surfaces; and the concave structure on the surface of the supporting structural member is attached to the human body more closely, the imaging probe does not need to retract during treatment, and the imaging quality can be improved.
The piezoelectric column array is arranged on the supporting structural member, the number of the array can be increased or reduced according to the range of a target area, the size of the power probe is not limited by the size of a ceramic material, and different geometric focus positions can be adjusted through time delay without bending.
The direction of the cylindrical piezoelectric array in the circular arc direction can be the center of a structural member or not, so that the initial focus position in the circular arc direction can not be a fixed position.
The piezoelectric column arrays arranged on the supporting structural member can be randomly distributed and can be uniformly distributed, and side lobes and grating lobes can be reduced. Meanwhile, the supporting structural member is a single curved surface, and the installed piezoelectric column can be free of bending (bending is also in a protection range), so that the consistency and the yield of the power probe are improved.
The imaging probe has M+N leads and can be divided into odd and even numbers and arranged on the periphery, the FPC and the backing are integrally adhered to the composite material with the matching layer, the number of bonding wires is small, and the bonding pads and the electrodes are easy to ensure one-to-one correspondence.
The imaging probe can assist power ultrasonic focusing and improve focusing effect.
The invention utilizes the heat generated by ultrasonic focusing to treat the relevant region, so that the temperature of the region is raised to a certain value and lasts for a period of time to achieve the treatment purpose. In which a recyclable flow couplant is loaded to act as a transitional medium between the transducer and the water bladder and to carry away heat generated by the transducer.
Compared with the mode of rotation and translation, the ultrasonic imaging probe provided by the invention has the advantages that mechanical control is not needed, the assembly is simpler, and the resolution consistency is good when an image is synthesized.
Drawings
FIG. 1 is an exploded view of the overall structure of the present invention.
FIG. 2 is a schematic cross-sectional view of the whole structure of the present invention.
Fig. 3 is an exploded view of a two-dimensional area array ultrasound imaging probe.
Fig. 4 is a layer of M x N type piezoelectric composite material for an uncoated electrode.
Fig. 5 is a schematic diagram of m×n piezoelectric composite layer division front electrode.
Fig. 6 is a schematic diagram of a dividing back electrode of an M x N type piezoelectric composite layer.
Fig. 7 is a schematic diagram of the front electrode after adding a matching layer.
Fig. 8 is a schematic diagram of a flexible circuit board with a slot in the middle.
Fig. 9 is a schematic view of a boss-type backing layer.
Fig. 10 is a diagram of a flexible circuit board mated with a boss backing.
Fig. 11 is a schematic diagram of a flexible circuit board after bending.
Fig. 12 is a schematic view of an acoustic head of a two-dimensional area array ultrasound imaging probe.
Fig. 13 is a schematic diagram of the sonic head packaging of a two-dimensional area array ultrasonic imaging probe.
Fig. 14 is a schematic diagram of an even-numbered cylindrical piezoelectric array, wherein (a) is a front schematic diagram and (B) is a back schematic diagram.
Fig. 15 is a schematic view of an odd-numbered cylindrical piezoelectric array, wherein (a) is a front schematic view and (B) is a back schematic view.
Fig. 16 is a schematic view of a support structure.
FIG. 17 is a schematic view of an imaging probe assembled with a cylindrical piezoelectric array in a support structure.
Fig. 18 is a schematic diagram of a coupling water bladder, wherein (a) is a front schematic diagram and (B) is a back schematic diagram.
Fig. 19 is a schematic view of the coupling water bladder after installation.
Marked in the figure as: 1-coupling water bag, 2-odd number cylinder type piezoelectric array, 3-even number cylinder type piezoelectric array, 4-supporting structure, 5-probe shell, 6-matching layer, 7-piezoelectricity composite material layer, 8-backing layer, 9-flexible circuit board, 10-back cover, 11-front electrode, 12-back electrode, 13-edge electrode, 14-boss, 15-draw-in groove, 16-bar groove.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
As shown in fig. 1 and 2, a phased array power ultrasonic device with a two-dimensional imaging probe in the center comprises a coupling water bag 1, a supporting structural member 4, a phased array power transducer and a two-dimensional area array ultrasonic imaging probe, wherein the coupling water bag 1 is used as a waterproof full-package structural member to wrap the upper side and the surrounding side of the supporting structural member 4, the upper surfaces of the coupling water bag 1 and the supporting structural member 4 are both curved surfaces, a positioning groove for installing the phased array power transducer is formed in the upper surface of the supporting structural member 4, a through hole for installing the two-dimensional area array ultrasonic imaging probe is formed in the middle of the supporting structural member, and the two-dimensional area array ultrasonic imaging probe is installed in the center of the through hole and is sealed by glue or is mechanically sealed (such as sealing ring matched mechanical assembly).
The phased array power transducer is formed by arranging a plurality of groups of even-numbered cylindrical piezoelectric arrays 3 and a plurality of groups of odd-numbered cylindrical piezoelectric arrays 2. The even-numbered cylindrical piezoelectric arrays 3 and the odd-numbered cylindrical piezoelectric arrays 2 are embedded with piezoelectric columns which are randomly distributed or uniformly distributed, and the piezoelectric column arrays are arranged on the supporting piece and are arranged in an arc curved surface. The performance of the transmit array can be improved by increasing the number of arrays and changing the arrangement, and the power array is not limited by the ceramic size.
As shown in fig. 3, the two-dimensional area array ultrasonic imaging probe comprises a matching layer 6, a piezoelectric composite material layer 7, a backing layer 8, a flexible circuit board 9 and a probe shell 5, wherein the probe shell 5 is of a hollow structure which is communicated up and down, a rear cover 10 is arranged at the bottom of the probe shell, strip-shaped grooves 16 are formed in the periphery of the rear cover 10, and the matching layer 6, the piezoelectric composite material layer 7, the flexible circuit board 9 and the backing layer 8 are sequentially arranged inside the probe shell 5 from top to bottom.
As shown in fig. 4, firstly, preparing an M x N type piezoelectric composite material, cutting a piezoelectric ceramic column according to acoustic requirement parameters, filling a polymer, and grinding to acoustic specified parameters; wherein each main array element in the m×n piezoelectric composite material may include a plurality of sub array elements, and a space is reserved around the composite material as an edge-wrapping electrode 13. The number of rows and columns is specifically set according to the requirements.
As shown in fig. 5 and 6, double-sided electrodes are prepared on the m×n piezoelectric composite material, the front electrode 11 is divided into N rows, the back electrode 12 is divided into M columns, the wrapping electrodes 13 are left on two sides of the M columns, the front N rows of electrodes are led to two columns of electrodes on the back side through the wrapping electrodes and are divided into N rows, and the electrodes are divided along the kerfs and according to the parameters of the main array elements.
As shown in fig. 7, a matching layer 6 is added on the front electrode 11 surface, the number of matching layers is not limited, and parameters of the matching layer 6 are formulated by acoustic requirements.
As shown in fig. 8 and 9, a flexible circuit board (FPC) with a slot in the middle and a boss backing are prepared, the size of the slot in the middle of the FPC is completely matched with that of the boss, and the height of the boss is completely consistent with the thickness of the FPC; and bonding pads and leads on the FPC board are led at the periphery of the FPC board by odd-even intervals, so that the FPC board is easy to process and lead welding.
As shown in fig. 10 and 11, the FPC board is mounted on the boss back, and is bent downward by 90 °, the FPC board is completely clamped in the clamping grooves 15 around the boss back after being bent, the depth of the grooves around is consistent with the thickness of the FPC board, and the flexible circuit board penetrates out of the strip grooves 16 around the rear cover after being bent.
As shown in fig. 12, the pads on the FPC board and the electrodes of the m×n piezoelectric composite material are guaranteed to be in one-to-one correspondence with the Ji Tutai backing and the m×n piezoelectric composite material layer, and then the boss backing and the composite material layer are bonded together. The electrode can be led out through the FPC to obtain the two-dimensional imaging sound head.
As shown in fig. 13, the acoustic head is installed in the probe housing 5, and the two-dimensional area array ultrasonic imaging probe can be obtained by packaging the rear cover 10.
As shown in fig. 14 and 15, the even-numbered cylindrical piezoelectric array 3 and the odd-numbered cylindrical piezoelectric array 2 are prepared, and electrodes are respectively plated on the front surfaces of the cylindrical piezoelectric arrays, and the electrodes can be gold, silver, copper, nickel and the like. And the edge-covered electrode is prepared on the back surface, and the ground electrode on the front surface is led to the back surface of the piezoelectric array, so that the lead welding is easy.
As shown in fig. 16, the two-dimensional area array ultrasonic imaging probe is mounted and bonded with the transducer support in a matched manner through the boss of the shell and is waterproof sealed. And the even-numbered cylindrical piezoelectric arrays 3 and the odd-numbered cylindrical piezoelectric arrays 2 are arranged on the clamping grooves of the transducer bracket at intervals, and are adhered and sealed in a waterproof manner.
As shown in fig. 17, the coupling water bag 1 is installed on the supporting structural member 4, the coupling water bag 1 is fully wrapped around the supporting structural member 4, and the coupling agent is filled between the water bag and the transducer support.
In the invention, regarding a two-dimensional area array ultrasonic imaging probe, an M-N piezoelectric array of a piezoelectric composite material layer is formed by arranging M rows and N columns of piezoelectric array elements and is used for receiving and transmitting ultrasonic signals; the edge-wrapped row electrode or the edge-wrapped column electrode is used for leading electrodes of the piezoelectric ceramic array to be on the same surface and realizing the application of an excitation signal to the piezoelectric array element or the reception of a pulse signal generated by the piezoelectric ceramic; the polymer is filled with decoupling materials among the slits of the piezoelectric array elements and is used for connecting the piezoelectric columns and reducing the crosstalk interference of the piezoelectric array elements. The matching layer realizes acoustic impedance matching of the piezoelectric array element and the object medium, enhances the insonification capacity and bandwidth of the transducer, and determines thickness and parameters according to the working frequency and acoustic parameters of the piezoelectric array. The backing material is used for absorbing the sound energy of the back surface of the piezoelectric array, and the thickness and the parameters are determined according to the working frequency and the acoustic parameters of the piezoelectric array; the FPC leads are used for connecting electrode leads of the piezoelectric array into a system circuit.
When the imaging transducer emits, according to the observed area, the system calculates the sequence number of the array element to be excited (for example, the first array element is required to work, and only excitation signals are applied to the first row and first column electrodes to work), a voltage signal excited by the system is applied to the electrodes of the transducer array through FPC leads, and the piezoelectric array vibrates under the excitation of the voltage signal to generate ultrasonic radiation. When the ultrasonic wave reaches the detected object, the reflected echo signal is radiated on the ultrasonic array, the piezoelectric array generates a corresponding voltage signal on the electrode surface due to positive piezoelectric effect, and the echo signal containing the information of the detected object is transmitted back to the system for processing through the FPC, so that the detected object can be imaged.
The application method of the invention comprises the following steps: the method comprises the steps of firstly smearing a medical couplant (a gel substance commonly used in B ultrasonic examination) on the lower surface of a water sac, manually controlling an external mechanical structure to adjust the position of a treatment probe, enabling the probe to be approximately positioned at the center position above a focus, starting a two-dimensional area array imaging probe, realizing scanning of a space transverse longitudinal section through electronic delay control of different channels, detecting focus areas, integrally grasping three-dimensional information of the focus areas, defining a treatment area on a computer display graph, determining a treatment scheme through software, setting the position of a treatment target point and a number of parameters, setting electronic delay according to the position of each target point by power ultrasonic and two-dimensional area array auxiliary force, controlling focus depth and deflection, enabling energy to continuously stand for a period of time at the position of each target point after treatment is started, simultaneously monitoring temperature rise at the position of the target point in real time by using an algorithm, jumping to the next target point after reaching a threshold value, continuously carrying away heat generated by a transducer in the treatment through an external peristaltic pump in the whole treatment process. After completion of the treatment, the preliminary effect of the treatment was evaluated by an imaging probe.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It should be understood by those skilled in the art that the above embodiments do not limit the scope of the present invention in any way, and all technical solutions obtained by equivalent substitution and the like fall within the scope of the present invention.
The invention is not related in part to the same as or can be practiced with the prior art.
Claims (7)
1. The phased array power ultrasonic device with the two-dimensional imaging probe in the center is characterized in that: the device comprises a coupling water bag, a supporting structural member, a phased array power transducer and a two-dimensional area array ultrasonic imaging probe, wherein the coupling water bag is used as a waterproof full-package structural member to wrap the upper side and the peripheral side of the supporting structural member, the upper surfaces of the coupling water bag and the supporting structural member are both curved surfaces, the upper surface of the supporting structural member is provided with a positioning groove for installing the phased array power transducer, the middle part of the supporting structural member is provided with a through hole for installing the two-dimensional area array ultrasonic imaging probe, and the two-dimensional area array ultrasonic imaging probe is installed in the center of the through hole and sealed by glue or in a mechanical assembly mode;
the phased array power transducer is formed by arranging a plurality of groups of even-numbered cylindrical piezoelectric arrays and a plurality of groups of odd-numbered cylindrical piezoelectric arrays; the even-numbered cylindrical piezoelectric arrays and the odd-numbered cylindrical piezoelectric arrays are internally embedded with piezoelectric columns which are randomly distributed or uniformly distributed, and the piezoelectric column arrays are arranged on the supporting piece and are arranged in a circular arc curved surface;
the coupling water bag is filled with a coupling agent serving as an acoustic propagation transition medium between the phased array power transducer and the coupling water bag, and the coupling water bag is made of a biocompatible material; the coupling agent is deaerated water or deaerated water solution, and can flow circularly through an external peristaltic pump.
2. A phased array power ultrasound apparatus with a two-dimensional imaging probe in the center, as claimed in claim 1, wherein: the radius of curvature of a quasi-line in a single curved surface of the phased array power transducer is 5cm-30cm, the curvature is matched with the curved surface of the body surface of a treatment area, the total number of primitives is 64-16384, and the center frequency is 0.2MHz-10MHz.
3. A phased array power ultrasound apparatus with a two-dimensional imaging probe in the center, as claimed in claim 1, wherein: the material of the supporting structural member is any one of stainless steel, aluminum, plastic or epoxy material.
4. A phased array power ultrasound apparatus with a two-dimensional imaging probe in the center, as claimed in claim 1, wherein: the two-dimensional area array ultrasonic imaging probe comprises a matching layer, a piezoelectric composite material layer, a backing layer, a flexible circuit board and a probe shell, wherein the probe shell is of a hollow structure which is communicated up and down, a rear cover is arranged at the bottom of the probe shell, strip-shaped grooves are formed in the periphery of the rear cover, and the matching layer, the piezoelectric composite material layer, the flexible circuit board and the backing layer are sequentially arranged inside the probe shell from top to bottom.
5. A phased array power ultrasound apparatus with a two-dimensional imaging probe in the center, as claimed in claim 4, wherein: the piezoelectric composite material layer adopts a piezoelectric composite material with a 1-3/2-2 structure which adopts a transmitting and receiving piezoelectric ceramic or takes the piezoelectric ceramic as a substrate, and the upper surface and the lower surface of the piezoelectric composite material layer are plated with gold, silver, copper or nickel; the front and back sides of the piezoelectric composite material layer are provided with double-sided electrodes consisting of front electrodes and back electrodes, and the two sides of the piezoelectric composite material layer are provided with edge wrapping electrodes, wherein the front electrodes are divided into N rows, the back electrodes are divided into M columns, the edge wrapping electrodes are divided into N rows, the front N rows of electrodes are led to the two outermost rows of electrodes on the back side through the edge wrapping electrodes, and each electrode is divided along a kerf and according to parameters of a main array element.
6. A phased array power ultrasound apparatus with a two-dimensional imaging probe in the center, as claimed in claim 5, wherein: the top end of the back lining layer is provided with a boss, and the side surfaces of the periphery are provided with clamping grooves; the middle of the flexible circuit board is hollowed out, the size of the middle groove is matched with the boss of the backing layer, the periphery of the flexible circuit board extends outwards and can be bent downwards, the flexible circuit board is clamped in the clamping grooves around the backing layer after bending, the depth of the clamping grooves around is consistent with the thickness of the flexible circuit board, and the flexible circuit board penetrates out of the strip-shaped grooves around the rear cover after bending.
7. A phased array power ultrasound apparatus with a two-dimensional imaging probe in the center, as claimed in claim 6, wherein: the bonding pads on the flexible circuit board are in one-to-one correspondence with the electrodes of the M x N type piezoelectric composite material layer, and the bosses of the backing layer are bonded at the bottom of the piezoelectric composite material layer.
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