CN114903561A - An array type hydroelectric shock wave controllable focusing device - Google Patents

Abstract

An array type hydroelectric shock wave controllable focusing device, comprising a shell, an energy storage electric device, an electrode and an energy transfer liquid, the energy transfer liquid is arranged in the shell, and the electrode is immersed in the energy transfer liquid; The electrode includes a negative electrode and a plurality of positive electrode matrices arranged linearly at equal intervals; the positive electrode matrix is electrically connected to an array switch, the array switch is electrically connected to the energy storage device, and the array switch is also electrically connected to the array switch. a microprocessor for storing the time delay of the positive electrode matrix. The array-type hydroelectric shock wave controllable focusing device disclosed in the present invention controls the excitation signal of each electrode array element based on the near-field beam forming principle. The field beamforming filter approximates the time delay simplification system. Based on the microprocessor outputting the corresponding time delay of each electrode array element, the array switch is controlled to realize the controllable focusing of each electrode array element.

Description

An array type hydroelectric shock wave controllable focusing device

technical field

The invention relates to a hydroelectric shock wave generating device, in particular to an array type hydroelectric shock wave controllable focusing device.

Background technique

Hydroelectric technology Extracorporeal shock wave technology has been widely used in the medical field to treat human urinary calculi. Its basic technical principle is to generate shock waves through discharge and use reflection or acoustic lenses to achieve energy focusing, and conduct impedance matching through aqueous media to introduce the focused shock waves into the human body. , crushing the stone through the concentrated physical effect produced by the energy focusing.

The basic technical principle of the existing hydroelectric focused shock wave medical equipment is to use the electrode tip of the electrode rod to perform high-voltage discharge to form a radial hydroelectric shock wave, and to focus the shock wave through a reflective structure, such as an ellipsoid reflection surface, to make the hydroelectric shock wave Energy focusing is achieved at the focal point of the reflective structure. Although the technical principle is simple to implement and has high energy conversion efficiency, a single electrode is used as an energy source to generate a focused shock wave. Although it is focused by a reflective surface, it still requires a high discharge voltage, causing the electrode tip to undergo multiple high-voltage discharges. It is easy to be damaged and becomes a consumable, which increases the cost of equipment use; at the same time, because the focus of the reflective structure is fixed, it is necessary to use scanning equipment such as X-ray to locate the stone before the shock wave treatment. The high complexity of the equipment and the time-consuming positioning process reduce the treatment efficiency and increase the workload of the equipment operation.

In order to overcome the defects existing in the prior art, Chinese patent CN200310112407.5 proposes a multi-purpose directional shock wave generating device, which generates directional emission shock waves, and has many output modes. It will not cause the drift of the focus of the shock wave. Since the discharge end is changed to a convex object such as a discharge ball, the service life is greatly extended. However, this technical solution needs to replace the discharge ends of different shapes as a whole, and at the same time, for the same discharge end, the shock wave focusing point still cannot be adjusted flexibly.

Aiming at the low complexity and low cost requirements of hydroelectric focusing shock wave medical equipment in specific medical application scenarios, the purpose of the present invention is to use array focusing to realize flexible adjustment, and to form an array of multiple electrodes for controlled focusing, and to provide a Array type hydroelectric shock wave controllable focusing device.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the purpose of the present invention is to provide an array type hydraulic shock wave controllable focusing device.

For achieving the above object, the present invention provides the following technical solutions:

An array type hydroelectric shock wave controllable focusing device, comprising a casing, an electric energy storage device, an electrode and an energy transfer liquid, characterized in that the energy transfer liquid is arranged in the casing, and the electrode is immersed in the transfer liquid. energy liquid; the electrode includes a negative electrode and a number of positive electrode matrices arranged linearly at equal intervals; the positive electrode matrix is electrically connected with an array switch, the array switch is electrically connected with the energy storage device, and the array switch is electrically connected It is also electrically connected to a microprocessor, and the microprocessor is used for storing the time delay of the positive electrode matrix.

Further, the negative electrode has a T-shaped structure.

Further, the energy storage electrical appliance is a high voltage discharge capacitor.

Further, the housing is provided with a water inlet and a water outlet.

Further, the energy transfer liquid is clean water.

The present invention also proposes a control method of an array type hydraulic shock wave controllable focusing device, which includes the following steps:

Step 1: Time delay generation, the electrode time delay is calculated and generated corresponding to each focus position of the shock wave, and the electrode time delay is stored in the microprocessor;

Step 2: Input the focus position, determine the shock wave focus position according to the treatment needs and input it to the microprocessor;

Step 3: controlling the selective electrification time of each positive electrode in the electrode array, and calling out the corresponding electrode time delay in the microprocessor according to the input shock wave focus position, and the microprocessor controls the electrification time of each electrode according to the electrode time delay;

Step 4: Each electrode generates a shock wave, and the shock wave generated to each electrode is aligned and focused in time through time delay, so as to realize the shock wave focusing corresponding to the focusing position.

The beneficial effects of the present invention are:

The invention proposes an array type hydroelectric shock wave controllable focusing device. The disclosed array type hydroelectric shock wave controllable focusing device controls the excitation signal of each discharge electrode in each array based on the principle of near-field beam forming. By designing a linear positive electrode Array, T-shaped negative charge and linear distribution of high-voltage discharge positions of each electrode array element are ensured, and the system is further simplified by approximating the time delay of the near-field beamforming filter, so that the corresponding time delay of each electrode array element can be output based on the microprocessor, control The array switch realizes the controllable focusing of each electrode array element.

Therefore, the array type hydraulic shock wave controllable focusing device proposed in the present invention can significantly reduce the discharge voltage of each electrode of the electrode array while ensuring the shock wave focusing intensity and treatment effect, and can save the traditional focusing reflection structure. The mechanical moving device realizes the controllable digital focusing for aligning the position of the stone, thus realizing fast and accurate alignment in the actual medical operation of the hydroelectric focusing shock wave medical equipment, which is beneficial to reduce the equipment cost and improve the efficiency.

Description of drawings

In order to illustrate the embodiments of the invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only For some embodiments of the invention, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic diagram of an electrode array element of an array type hydroelectric shock wave controllable focusing device of the present invention;

2 is a schematic diagram of an array type hydraulic shock wave controllable focusing device of the present invention;

In the figure: housing 10 , energy storage device 20 , negative electrode 30 , positive electrode matrix 40 , energy transfer liquid 50 , array switch 60 , microprocessor 70 , water inlet 801 , water outlet 802 , and focus position 90 .

Detailed ways

The present invention will be described in detail below with reference to FIGS. 1-2 .

For achieving the above object, the present invention provides the following technical solutions:

An array type hydroelectric shock wave controllable focusing device, comprising a casing 10, an energy storage electrical appliance 20, electrodes and an energy transfer liquid 50, the energy transfer liquid 20 is arranged in the casing 10, and the electrodes are immersed in the energy transfer liquid 50; It includes a negative electrode 30 and a number of positive electrode matrices 40 with equal spacing and linear arrangement; each positive electrode 401 in the positive electrode matrix 40 is electrically connected to the array switch 60, the array switch 60 is electrically connected to the energy storage device 20, and the array switch 60 is recharged Connected to the microprocessor 70 for storing the time delay of the positive electrode matrix 40 .

Preferably, the negative electrode has a T-shaped structure.

Preferably, the energy storage device is a high-voltage discharge capacitor.

Preferably, the housing is provided with a water inlet and a water outlet.

Preferably, the energy transfer liquid is clean water.

The present invention also proposes a control method of an array type hydraulic shock wave controllable focusing device, which includes the following steps:

Step 1: Time delay generation, the electrode time delay is calculated and generated corresponding to each focus position of the shock wave, and the electrode time delay is stored in the microprocessor;

Step 2: Input the focus position, determine the shock wave focus position according to the treatment needs and input it to the microprocessor;

Step 3: controlling the selective electrification time of each positive electrode in the electrode array, and calling out the corresponding electrode time delay in the microprocessor according to the input shock wave focus position, and the microprocessor controls the electrification time of each electrode according to the electrode time delay;

Step 4: Each electrode generates a shock wave, and the shock wave generated to each electrode is aligned and focused in time through time delay, so as to realize the shock wave focusing corresponding to the focusing position.

Considering the application characteristics of hydroelectric focused shock wave therapy, the focused shock wave is in the near-field range, and the shock wave front generated by the electrode array discharge is a spherical wave instead of a plane wave, so the control signal generation needs to be performed according to the near-field array beam control method.

则如图1所示。It is assumed that the electrode is an M-element electrode array, that is, the electrode is composed of a T-shaped structure negative electrode and m positive electrodes, and each positive electrode and a T-shaped structure negative electrode form an electrode array element. The focus position 90 of the controllable shock wave is in the near field range of the array, the center of the array is taken as the origin of coordinates, the distance between the focus position S and the origin of coordinates is r, the azimuth angle is θ, and the pitch angle is

Then as shown in Figure 1.

Generally, let the spatial coordinates of the mth element of the M-element array be (x _m , y _m , z _m ), the distance to the origin is r _m , and the distance from the focus position 90 to the origin is r, then the mth The distance between the positive electrode and the focus position S is d _m and can be expressed as:

式(1)可以写为：Considering the two-dimensional simplified situation, set the focus position S of the controllable shock wave on the z-axis, that is, θ=90°,

Equation (1) can be written as:

Considering the two-dimensional simplification situation, in this embodiment, M=8, that is, there are 8 positive electrodes, a total of 8 electrode array elements, the 8 positive electrodes are arranged on the x-axis at equal intervals, the center of the array is the origin of the coordinates, and the distance between the array elements is d, then there are:

Therefore, it can be known that the received signal of the shock wave signal of the mth positive electrode discharge at the focus position S can be expressed as:

Among them, t is the time coordinate, A is the discharge voltage amplitude constant of the energy storage device 20, w is the angular frequency of the shock wave signal, k=2π/λ, and λ is the wavelength of the shock wave signal.

According to the near-field beamforming principle, the forming filter h _m (t) with order L is used for near-field focusing processing, then the shock wave signal of each array element received at the focusing position 90 is:

The near-field beamforming filter h _m (t) can be obtained using the near-field beamforming formula known in the art:

where r ₀ is the coordinate on the Z axis when the focus position 90 is set on the Z axis.

Considering that in this embodiment, the electrode discharge is a transient process, in order to simplify the system consideration, each electrode array element is selectively turned on by time delay to perform controllable shock wave focusing, that is, equivalently by controlling the time of the mth electrode array element. The delay discharge realizes spatial focusing, and the delay makes the shock wave of the mth array element align and superimpose in time to achieve the focusing effect. The delay time τ _m of the delay discharge of the mth electrode array element can be expressed as:

Then, the shock wave signal of each electrode array element received at the Z-axis focusing position 90 will realize the shock wave controllable focusing at the position r ₀ after time delay control, which can be expressed as:

The function δ is a unit impulse function, and in this embodiment, the time delay is controlled by the microprocessor 70 and output to the mth electrode array element corresponding to the control electrodes of the array switch 60 .

It should be pointed out that the above derivation process is simplified in two dimensions for the convenience of description, and this processing method is also applicable in a three-dimensional scene, that is, the focus position can be set on a three-dimensional plane.

To sum up, an array type hydroelectric shock wave controllable focusing device proposed by the present invention, the disclosed array type hydroelectric shock wave controllable focusing device controls the excitation signal of each discharge electrode in each array based on the near-field beamforming principle, By designing a linear positive electrode array, a T-shaped negative electrode and ensuring the linear distribution of the high-voltage discharge position of each electrode array element, and further simplifying the system by approximating the time delay of the near-field beamforming filter, the corresponding output of each array element can be output based on the microprocessor. Time delay, control switch array to achieve controllable focusing of each electrode array element.

Therefore, the array type hydraulic shock wave controllable focusing device proposed in the present invention can significantly reduce the discharge voltage of each electrode of the electrode array while ensuring the shock wave focusing intensity and treatment effect, and can save the traditional focusing reflection structure. The mechanical moving device realizes the controllable digital focusing for aligning the position of the stone, thus realizing fast and accurate alignment in the actual medical operation of the hydroelectric focusing shock wave medical equipment, which is beneficial to reduce the equipment cost and improve the efficiency.

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement them, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (6)

1. An array type liquid-electric shock wave controllable focusing device comprises a shell, an energy storage electric appliance, an electrode and energy transfer liquid, and is characterized in that the energy transfer liquid is arranged in the shell, and the electrode is immersed in the energy transfer liquid; the electrodes comprise negative electrodes and a plurality of positive electrode matrixes which are linearly arranged at equal intervals; the positive electrode matrix is electrically connected with an array switch, the array switch is electrically connected with the energy storage electric appliance, the array switch is also electrically connected with a microprocessor, and the microprocessor is used for storing the time delay of the positive electrode matrix.

2. The array-type electrohydraulic shock wave controllable focusing device of claim 1, wherein said negative electrode is in a T-shaped structure.

3. The array type electrohydraulic shock wave controllable focusing device of claim 1, wherein the energy storage device is a high-voltage discharge capacitor.

4. The array type electrohydraulic shock wave controllable focusing device of claim 1, wherein said housing is provided with a water inlet and a water outlet.

5. The array type electrohydraulic shock wave controllable focusing device of claim 1, wherein said energy transfer liquid is clean water.

6. A control mode of an array type liquid electric shock wave controllable focusing device is characterized by comprising the following steps:

step 1: generating time delay, calculating and generating electrode time delay corresponding to each focusing position of the shock wave, and storing the electrode time delay into a microprocessor;

step 2: the focusing position input is used for determining the focusing position of the shock wave according to the treatment requirement and inputting the focusing position into the microprocessor;

and step 3: controlling the selective electrifying time of each positive electrode in the electrode array, calling corresponding electrode time delay in the microprocessor according to the input shock wave focusing position, and controlling the electrifying time of each electrode by the microprocessor according to the electrode time delay;

and 4, step 4: each electrode generates shock waves, and the shock waves generated by each electrode are aligned and focused in time through time delay, so that shock wave focusing at a corresponding focusing position is realized.

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