CN1160135C - Power ultrasonic transmitter for high-energy ultrasonic external focusing heat therapy machine - Google Patents

Abstract

The present invention relates to a high-power ultrasonic wave emitter for an FEP-BY01 high-energy ultrasonic external focusing heat treatment device, which belongs to the technical field of a medical appliance. The present invention has the structure that the calibre of the emitter is enlarged, nearly thousands of piezoelectric array elements with minor diameters are fixed on a spherical substrate of which the calibre is from 300 to 450mm, and the present invention generally uses piezoelectric ceramic sheets of which the diameters are smaller than 12mm; the piezoelectric ceramic sheets are orderly adhered to the surface of an inner spherical surface in parallel or in series. The device has the advantages of simple structure, convenient use and reliable performance; ultrasonic beams which dispersedly emit can be focused to form a point-shaped high-temperature focal region, temperature can reach 70 DEG C to 100 DEG C, and tumour cells can be rapidly killed at high temperature. The high-power ultrasonic wave emitter are arranged on the heat treatment device to form an ideal therapeutic system capable of killing cancer tissue without operation.

Description

The high-energy ultrasonic external focusing heat therapy machine power ultrasonic transmitter

The present invention relates to a kind of novel high-power ultrasonic transmitter of the FEP-BY01 of being used for high-energy ultrasonic external focusing heat therapy machine, belong to technical field of medical instruments.

The core of ultrasonic hyperthermia machine is a ultrasonic transmitter, at present common what adopt is to fix 16～24 piezoelectricity array elements on a spherical substrate to the prior art equipment, the diameter of every piezoelectricity array element is about 20mm, employing parallel connection or serial connection mode are arranged in the surface of Internal Spherical Surface in an orderly manner between them, form the transmitter unit array of Internal Spherical Surface; Generally about 200mm, also about 200mm, power is generally about 1 kilowatt for spherical radius R value for the bore of emitter, but in clinical result of use, focusing effect is bad, pain during treatment, need anesthesia, and produce an outstanding complication, promptly the rate of burning of skin reaches 70%.

The principle of ultrasonic transmitter is: when applying one group of continuous electric pulse that phase place is identical or master phase is identical to these piezoelectric patches, piezoelectricity array element is promptly launched some bundle ultrasound wave, and the bundle Shu Zhixiang centre of sphere, the ultrasonic beam process transmitting medium of this dispersion emission is when the transmissive body layer, incident section energy disperses, then form a high-energy-density district (burnt territory) when focusing on the back for point-like (sphere center position), because acoustic energy is converted into heat energy, this zone forms a high-temperature region, with the in-vivo tumour is target, in the high-temperature region, cause tumor cell dead fast, need not operate on the novel therapy equipment that to kill cancerous tissue thereby form one.

It is good to the purpose of this invention is to provide a kind of focusing effect, through experiment repeatedly, change the various parameters of prior art, solve that people thirst for solving always but the technical barrier of failing all the time to succeed, promptly improve the temperature in point-like high-energy-density district greatly, but avoid the large power supersonic wave launcher of skin pain and skin burn.

In order to achieve the above object, the present invention strengthens the bore of existing emitter by the following technical solutions, improves transmitting power, and uses the piezoelectric ceramic piece of minor diameter, under the identical situation of emitter bore, enlarges spherical radius.

The invention has the advantages that: give full play to the efficient of focusing, make the interior focus temp of human body reach 70 ℃～100 ℃, but avoided skin burn, need not anaesthetize fully during treatment.

Accompanying drawing 1 is to enlarge the emitter bore to reduce projectile energy density sketch map.

Accompanying drawing 2 is minor diameter piezoelectricity array element phase contrast comparison principle sketch maps.

Accompanying drawing 3 is to enlarge spherical radius to reduce sound wave counteracting sketch map.

Accompanying drawing 4 is full sectional views of the present invention.

Accompanying drawing 5 is vertical views of the present invention.

Now in conjunction with the accompanying drawings the present invention is described in further detail.

When the emitter bore was chosen as the 200mm left and right sides, energy density was higher on the ultrasound wave incident approach, caused skin and soft tissue to burn, and according to experimental studies results, the bore of emitter was increased to 300～450mm.As shown in Figure 1, R ₁/ R ₂=1/2, emission area $\frac{S_1}{{\mathrm{<figure-callout\; id="2"\; label="S"\; filenames="C9910292300071.png"\; state="\{\{state\}\}">S</figure-callout>}}_2}=\frac{{{\mathrm{\&pi;<figure-callout\; id="2"\; label="R"\; filenames="C9910292300071.png"\; state="\{\{state\}\}">R</figure-callout>}}^2}_1}{{{\mathrm{\&pi;<figure-callout\; id="2"\; label="R"\; filenames="C9910292300071.png"\; state="\{\{state\}\}">R</figure-callout>}}^2}_2}={({\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="C9910292300081.png"\; state="\{\{state\}\}">R</figure-callout>}}_1/R_2)}^2=1/4,$ Like this enlarged areas 4 times.When output 1KW level, big emitter also just drops to original 1/4 in initial focal zone energy density, formed energy density will be far below small-bore emitter in walking soft tissue to make projectile energy, therefore, can make skin during treatment, sub-dermal soft tissue sound absorption heats up and to cause the probability of burning to drop to minimum.As shown in Figure 3, on the emitter of identical bore, select 300～360mm radius, can reduce sound wave, strengthen focusing effect to cutting.

As shown in Figure 4, the piezoelectric patches (2) that is fixed at present on the spherical substrate (1) is 16 ~ 24, and every diameter is 20mm, thereby focusing effect is bad.Near uniform concave spherical surface wavefront, ideal concave spherical surface wavefront just has best focusing effect to the wavefront that a basic principle of emitter battle array design is a power ultrasonic as far as possible.Should be about 1MHZ for the supersonic frequency that is used to go deep into the above deep focus thermotherapy of 3cm purpose in the human body, this moment ultrasonic in human body wavelength only be about 1.5mm, obvious geometric accuracy to wave source has high requirements.Because making, the large tracts of land sphere ultrasonic transmitter of monolithic is difficult to realize, and the driving control of flat emitters battle array (or other aspheric surface battle array) generation spheric wave front is too complicated, so we adopt volume small size flat emitters to be combined into array near concave spherical surface, for reaching aforementioned purpose, should adopt the monolithic size smaller emitter of trying one's best, through the piezoelectric patches best results of experiment confirm diameter less than 12mm.

As shown in Figure 2, when forming the concave spherical surface battle array with circular little plain film, the selection of little plain film diameter: establishing whole concave spherical surface battle array spherical radius is R, and the little plain film diameter in unit is d, and little plain film center, unit and edge are δ to the difference of the distance of focus, then have $\mathrm{\&delta;}=R-L=R-\sqrt{R^2-{(d/2)}^2}$ 。

Phase contrast when the ultrasound wave that ultrasound wave that unit center produces and edge produce passes to the focus place is＜α.

Δ α=δ/λ * 3600=δ/c * δ * 3600=(3600/1.5 * 10-8) * δ=240 δ * 138 is arranged.

Wherein δ, R, L unit are m.

λ is ultrasonic wavelength, and unit is m.

C is a ultrasonic velocity, and unit is m/s, presses 1500m/s in water and the human body and calculates.

F is a supersonic frequency, and unit is HZ.Get R=0.3m, then if adopt φ 30mm plain film, 90 ° of Δ α ≈ adopt φ 20mm plain film, 40 ° of Δ α ≈

φ 16 plain films, 25.6 ° of Δ α ≈, and adopt φ 12mm plain film, 14.4 ° of Δ α ≈.

The large stretch of derivation in focus place generation sound intensity difference mutually with small pieces is omitted.

Nearly thousand this minor diameter piezoelectric patches are fixed on the spherical substrate, the chiasm interference that many thinner acoustic beams form can guarantee that hyperacoustic focusing efficiency gives full play to, the temperature of focus can reach 70 ℃～100 ℃ in the human body, thereby has guaranteed the stable and repeatable of therapeutic effect.

Claims (2)

1, a kind of high-energy ultrasonic external focusing heat therapy machine power ultrasonic transmitter, it is characterized in that: strengthen the emitter bore, at a bore be in the spherical substrate of 300～450mm intensive fixed diameter less than the piezoelectric patches of 12mm, adopt parallel connection or series system between them, stick on the surface in the endosphere in an orderly manner.

2, emitter according to claim 1 is characterized in that: when the emitter bore is identical, select 300～360mm spherical radius.

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