CN104623816A - Matrix type probe for ultrasonic physiotherapy instruments - Google Patents

Abstract

The invention provides a matrix probe for an ultrasonic physiotherapy apparatus, which includes a housing, piezoelectric laminations and cables. A piezoelectric stack includes a piezoelectric wafer array, a matching layer, and a backing layer. The piezoelectric chip array is composed of a number of chips, which can be in the shape of circular chips, rectangular chips, etc., and these chips are distributed in a matrix; the chips are connected to the ultrasonic physiotherapy device through cables, and the ultrasonic physiotherapy device sends out electrical excitation signals and converts them into ultrasonic waves through the chips. Radiation to the patient; the matching layer is set on one side of the radiation surface of the piezoelectric chip array to improve the ultrasonic radiation efficiency of the chip; the backing layer is set on the other side, and the ultrasonic waves emitted from the other side of the piezoelectric chip array are backed Lining reflections. The matrix probe provided by the present invention is specially developed for clinical physiotherapy, and it is used together with an ultrasonic physiotherapy instrument. It has good energy focusing effect, more targeted lesions or parts, simple and convenient operation, high safety, and wide applicability. features.

Description

A Matrix Probe for Ultrasonic Physiotherapy Apparatus

technical field

The invention relates to the technical field of design of an ultrasonic physiotherapy apparatus, in particular to a matrix probe used for an ultrasonic physiotherapy apparatus.

Background technique

At present, most of the probes used in ultrasonic physiotherapy are single-beam non-focusing probes. Even if it is a focusable concave probe, its focus is fixed and cannot be changed. Therefore, there must be enough ultrasonic energy at a certain depth below the human body surface to play a role on human tissues. The power of the ultrasound must reach a certain level. However, when the ultrasonic power is relatively high, there is a risk of excessive energy absorbed by non-lesional areas such as superficial tissues or parts of the human body, resulting in tissue damage. Therefore, only low-frequency ultrasonic waves with low absorption rate or large thickness of the so-called semi-absorbing layer can be used.

For a one-dimensional phased array probe (this probe is commonly used in ultrasound imaging), its deflection and focusing principle is shown in Figure 1. By controlling the trigger time of each array element, the sound beam can be deflected at different angles. It performs electronic focusing and scanning in the direction of the long axis, and the focus is adjustable; it adopts geometric focusing in the direction of the short axis, and the focal length is not adjustable.

The single-beam probe cannot adjust the focal length according to the tissue characteristics and subcutaneous depth of different lesions or parts, and in order to receive enough ultrasonic energy at the target to achieve the therapeutic effect, it must have a large enough transmission power.

In order to avoid excessive ultrasonic energy damage to the skin and non-focused tissues, the transmission power of the system must be limited within the specified safety range. One of the main problems brought about by this is that it is difficult to obtain the required energy intensity for deep subcutaneous lesions, so the treatment effect is always unsatisfactory. At the same time, non-lesional tissues absorb a lot of energy, making each treatment time longer and two treatments There must be a sufficient time interval in the middle, so that the function of non-lesional tissues can be restored to avoid irreversible damage, thus greatly increasing the period of physical therapy.

Contents of the invention

In order to solve the above problems, the present invention provides a matrix probe for an ultrasonic physiotherapy instrument, including:

The piezoelectric chip array is composed of several chips, which are distributed in a matrix; the chips are connected to the host of the ultrasonic physiotherapy apparatus, and the excitation signal sent by the host of the ultrasonic physiotherapy apparatus is converted into ultrasonic waves through the piezoelectric chip array, thereby radiating to the patient.

The matching layer is arranged on one side of the piezoelectric chip array, and the ultrasonic energy emitted by the radiation surface on one side of the piezoelectric chip array is emitted through the matching layer, and the matching layer is used to improve the radiation efficiency of ultrasound;

The backing layer is arranged on the other side of the piezoelectric chip array, and the backing layer is mainly used to reflect the ultrasonic energy emitted from the radiation surface on the other side of the piezoelectric chip array.

Preferably, the wafer may be a circular wafer.

Preferably, the matrix probe for an ultrasonic physiotherapy instrument further includes a housing, one end of which is open, and the backing layer, piezoelectric wafer array and matching layer are all arranged in the housing, and The radiation surface is located at the opening.

Preferably, a cable connected to the main body of the ultrasonic physiotherapy apparatus is also provided on the housing, and the positive and negative poles of each wafer are connected to the cable through wires.

Preferably, the wafer is made of piezoelectric ceramic material or piezoelectric single crystal material or piezoelectric composite material.

Preferably, the impedance of the matching layer is between the acoustic impedance of the wafer layer and the acoustic impedance of the human body.

Compared with the prior art, the present invention has the following advantages and positive effects due to the adoption of the above technical solutions:

1) In the matrix probe used in the ultrasonic physiotherapy apparatus provided by the present invention, several chips are distributed in a matrix, which can zoom in the direction perpendicular to the emitting surface, or in the parallel direction at the same time, that is, in the elevation angle and azimuth Focusing can be carried out in all angular directions, thus greatly expanding the focusing and scanning range of the probe, realizing low-intensity energy focused treatment for different parts of the human body or lesions, improving the treatment effect, and more convenient and quick;

2) The matrix probe used in the ultrasonic physiotherapy apparatus provided by the present invention, by setting a matching layer between the wafer layer and the human body, and making the impedance of the matching layer between the acoustic impedance of the wafer layer and the acoustic impedance of the human body, the radiation can be improved. Efficiency, so that more ultrasonic energy enters the human body for physical therapy, thus greatly improving work efficiency and physical therapy effect;

3) In the matrix probe used in the ultrasonic physiotherapy apparatus provided by the present invention, by setting the backing layer, most of the energy emitted by the side of the wafer layer facing away from the opening of the shell is reflected by the backing layer and directed toward the opening of the shell One side, thus strengthening the ultrasonic energy emitted to the human body, effectively improving the effect of physical therapy.

Description of drawings

The above and other features and advantages of the present invention can be more clearly understood through the following detailed description in conjunction with the accompanying drawings, wherein:

Fig. 1 is the schematic diagram of the deflection and focusing of the planar single-beam probe in the prior art;

Fig. 2 is the structural representation of the matrix probe provided by the present invention;

Fig. 3 is the structural representation of wafer layer among the present invention;

Fig. 4 is a schematic diagram of deflection and focusing of the matrix probe of the present invention.

Symbol Description:

1-wafer layer

101-wafer

2- Matching layer

3- Backing layer

4-shell

5-wire

6-cable.

Detailed ways

The invention will be described in more detail hereinafter with reference to the accompanying drawings showing embodiments of the invention. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In these drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.

With reference to Fig. 2-Fig. 4, the present invention provides a kind of matrix probe, is mainly developed for clinical ultrasonic physiotherapy application, and it is used in conjunction with ultrasonic physiotherapy apparatus; Or concave single-beam probes, the matrix probe provided by the present invention has better focusing effect of ultrasonic energy, more targeted lesions or parts, simpler and more convenient operation, high safety, and wide applicability.

Specifically, the matrix probe includes a housing 4, a piezoelectric stack and a cable 6, the piezoelectric stack includes a piezoelectric chip array 1, a backing layer 3 and a matching layer 2; one end of the housing 4 is open, and the cable 6 and The host computer of the ultrasonic physiotherapy instrument is connected. As shown in Fig. 3, wherein the piezoelectric chip array 1 is provided with some chips 101, and these chips are distributed in a matrix; the arrangement of the number of rows and the number of columns of the chip 101 on the piezoelectric chip array 1 is not limited here, Can be adjusted according to the specific situation. Chip 101 can be made of piezoelectric ceramic material, piezoelectric single crystal material, piezoelectric composite material, etc., and is not limited here; the positive and negative poles of each chip 101 are connected by electric wire 5 and cable 6 at the other end of housing 4. Connection; each chip 101 is connected to the host of the ultrasonic physiotherapy apparatus through the cable 6, and the host transmits the excitation signal to each chip 101, and converts the electrical signal into ultrasonic waves through the chip 101, thereby performing ultrasonic physiotherapy.

In the matrix probe provided by the present invention, several chips 101 are designed to be distributed in a matrix. The host computer of the ultrasonic physiotherapy instrument uses phased array electronic scanning to control the ultrasonic sound beam. Scanning and focusing in the vertical direction of the surface (that is, the plane where the wafer layer is located), or in the parallel direction at the same time, that is, focusing can be performed in both elevation and azimuth directions, so that the probe can be at any point in the radiation area Focusing, as shown in Figure 4; therefore, the matrix probe greatly expands the focusing and scanning range of the probe, and can perform spatial scanning and spatial focusing at the same time, achieving low-intensity energy for different parts of the human body or lesions. Focused treatment improves the effect of treatment and is more convenient and quick. Especially when it is used for physical therapy of extracranial thrombolysis, compared with the problem of limited focal area of single-beam probe or ring array probe in the prior art, the present invention can focus at any point in the radiation area, so that extracranial ultrasonic thrombolysis The restricted area is greatly reduced.

In this embodiment, the change of the thickness of the wafer 101 will lead to the change of the ultrasonic frequency, so the thickness of the wafer 101 can be determined according to the depth of the part to be treated, which is not limited here. In this embodiment, these wafers 101 are preferably circular wafers, and the wafers 101 can also be square or other shapes, which are not limited here.

In this embodiment, the backing layer 3 and the matching layer 2 are respectively disposed on both sides of the piezoelectric chip array 1 and cover the radiation surfaces on both sides of the piezoelectric chip array 1 . The matching layer 2 is arranged on one side of the radiation surface of the piezoelectric chip array 1, and the ultrasonic energy generated on the piezoelectric chip array 1 is radiated to the human body for physical therapy after passing through the matching layer 2; since the human body and the chip 101 both have a certain acoustic impedance, Moreover, the acoustic impedance of the human body is generally significantly lower than that of the chip 101. If the ultrasonic energy emitted by the piezoelectric chip array 1 is directly emitted to the human body, the large difference in acoustic impedance will cause the piezoelectric chip array 1 to be emitted to the human body. Most of the energy on the surface is reflected back, so that a large amount of ultrasonic energy used for physical therapy is lost, and the effect of physical therapy cannot be achieved; the present invention arranges a matching layer 2 between the piezoelectric chip array 1 and the human body, and makes the matching layer 2 The acoustic impedance is between the acoustic impedance of the piezoelectric chip array 1 and the acoustic impedance of the human body, reducing energy reflection, allowing more ultrasonic energy to enter the human body for physical therapy, thereby improving work efficiency and physical therapy effects. The material of the matching layer 2 can be selected according to the acoustic impedance of the wafer 101 and the human body, which is not limited here.

In the present embodiment, the backing layer 3 is arranged on the other side of the piezoelectric wafer array 1; since both sides of the wafer 101 receive the excitation electric signal of the main body of the ultrasonic physiotherapy apparatus, ultrasonic waves can be emitted from both sides, and only the energy emitted by the side of the radiation surface comes from It is used for human physiotherapy; by setting the backing layer 3 in the present invention, most of the energy emitted by the side of the piezoelectric chip array 1 facing away from the radiating surface is reflected back to the side of the radiating surface by the backing layer 3, thereby strengthening the emission to the human body Ultrasonic energy can effectively improve the effect of physical therapy. The backing layer 3 can be specifically made of low-impedance materials such as epoxy resin, which can be selected according to specific conditions, and is not limited here.

In summary, the present invention provides a matrix probe for an ultrasonic physiotherapy apparatus, which includes a housing, a piezoelectric wafer array, a matching layer and a backing layer arranged in the housing. The piezoelectric chip array is composed of several chips, and these chips are distributed in a matrix; the chips are connected to the host of the ultrasonic physiotherapy apparatus, and the excitation electrical signal sent by the host of the ultrasonic physiotherapy apparatus is converted into ultrasonic waves through the piezoelectric chip array, thereby radiating to the The diseased part; the matching layer is arranged on the radiation surface of the piezoelectric wafer array, and the energy emitted by one side of the radiation surface of the wafer layer is emitted through the matching layer, and the matching layer is used to improve the radiation efficiency of the wafer; the backing layer is arranged on the wafer layer On the other hand, most of the ultrasonic waves emitted from the other side of the wafer layer are reflected by the backing layer. The matrix probe provided by the present invention is specially developed for clinical ultrasonic physiotherapy. It is used in combination with an ultrasonic physiotherapy instrument and has the advantages of good energy focusing effect, more targeted lesions or parts, simple and convenient operation, high safety and wide applicability. Features.

Those skilled in the art will appreciate that the present invention may be embodied in many other specific forms without departing from the spirit or scope of the invention. Although embodiments of the present invention have been described, it should be understood that the present invention should not be limited to these embodiments, and that changes and modifications may be made by those skilled in the art within the spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. A matrix probe for an ultrasonic physiotherapy instrument, characterized in that it includes: The piezoelectric chip array is composed of several chips, and these chips are distributed in a matrix; the chips are connected to the host of the ultrasonic physiotherapy apparatus, and the excitation signal sent by the host of the ultrasonic physiotherapy apparatus is converted into ultrasonic waves through the piezoelectric chip array, thereby radiation to the affected area; The matching layer is arranged on one side of the piezoelectric chip array, and the ultrasonic energy emitted by the radiation surface on one side of the piezoelectric chip array is emitted through the matching layer, and the matching layer is used to improve the radiation efficiency of ultrasound; The backing layer is arranged on the other side of the piezoelectric chip array, and the backing layer is used to reflect the ultrasonic energy emitted by the radiation surface on the other side of the piezoelectric chip array. 2. The matrix probe for an ultrasonic physiotherapy apparatus according to claim 1, wherein the wafer is a circular wafer. 3. The matrix probe for an ultrasonic physiotherapy instrument according to claim 1, wherein the matrix probe for an ultrasonic physiotherapy instrument also includes a housing, one end of the housing is open, and the back of the housing is open. The liner, the piezoelectric chip array and the matching layer are all arranged in the casing, and the radiation surface is located at the opening. 4. The matrix probe for an ultrasonic physiotherapy apparatus according to claim 3, wherein a cable connected to the host of the ultrasonic physiotherapy apparatus is also provided on the housing, and the positive and negative sides of each of the chips The poles are connected to the cable by wires. 5 . The matrix probe for ultrasonic physiotherapy apparatus according to claim 1 , wherein the chip is made of piezoelectric ceramic material or piezoelectric single crystal material or piezoelectric composite material. 6 . 6. The matrix probe for an ultrasonic physiotherapy apparatus according to claim 1, wherein the acoustic impedance of the matching layer is between the acoustic impedance of the wafer layer and the acoustic impedance of the human body.