JP2882119B2 - Medical ultrasonic transducer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical ultrasonic transducer used for a medical device such as hyperthermia therapy, and more particularly to a connection between an ultrasonic transducer and a lead wire (lead wire drawing).
About the method.

[0002]

2. Description of the Related Art In a hyperthermia apparatus and a calculus crushing apparatus, since a strong ultrasonic wave needs to be generated, a large disk-shaped single vibrator is generally used. A power supply lead wire for generating ultrasonic waves is connected. FIG. 3 and FIG. 4 show a configuration of this type of conventional ultrasonic transducer and a method of extracting lead wires. FIG. 3 shows an electrode formed by depositing silver on the upper surface 12 and the lower surface 14 of the disc-shaped ultrasonic transducer 10, a plus-side lead wire is connected to the electrode on the upper surface 12, and an electrode on the lower surface 14 is formed. Is connected to a ground side lead wire. FIG. 4 shows FIG.
In this embodiment, a part of the ground electrode on the lower surface 14 of the disc-shaped ultrasonic transducer 10 is folded from the side surface to the upper surface 12 of the transducer, and a ground-side lead wire is connected to the folded electrode portion.

[0003]

The ultrasonic transducer shown in FIGS. 3 and 4 has the following problems.

That is, in the ultrasonic transducer shown in FIG. 3, since a lead wire is connected to the lower surface, which is the ultrasonic radiation surface, of the disk-shaped vibrator, irregularities are generated on the lower surface of the disk-shaped vibrator, and the acoustic lens However, there is a problem that the entire surface cannot be securely adhered to the lower surface of the disk-shaped vibrator. In the ultrasonic transducer shown in FIG. 4, both the plus side and the ground side lead wires are connected to the upper surface and pulled out, so that the problem in the ultrasonic transducer shown in FIG. There is a problem that asymmetry is generated for the whole, which adversely affects the thickness vibration, disturbs the radiation pattern of the ultrasonic waves, and makes it impossible to generate uniform ultrasonic waves. It has been confirmed by experiments that the radiation pattern of the ultrasonic wave is disturbed at the folded electrode portion.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a medical ultrasonic vibrator which can maintain symmetry and does not disturb the ultrasonic radiation pattern.

[0006]

In order to achieve the above object, a medical ultrasonic transducer according to the present invention comprises a disc-shaped transducer having a small hole penetrating at the center thereof, and one of the transducers. A thin metal plate joined to the surface, one lead wire introduced from the small hole, the tip of which is directly connected to the metal plate, and the small wire on the surface opposite to the metal plate joining surface of the vibrator. The other lead wire is connected to the vicinity of the hole, and the inner surface of the small hole and the one lead wire are separated by an air layer.

In the ultrasonic transducer for medical use according to the present invention, a small hole penetrating the center of the disk-shaped vibrator is formed, and a metal plate is joined to one surface of the vibrator having the small through-hole formed therein. Then, one lead wire is directly connected to this metal plate through a small through hole. The other lead wire is connected to the surface of the vibrator opposite to the metal plate bonding surface in the vicinity of the small through hole.

One of the lead wires is introduced from a small hole penetrating the vibrator and is directly connected to the metal plate. Around the lead wire in the small through hole, that is, the inner surface of the small through hole and the lead wire are connected. Are separated by an air layer, and the through hole is provided at the center of the vibrator and is small, so that the symmetry is maintained and the ultrasonic radiation pattern is not disturbed. As a result, uniform ultrasonic waves can be generated. Further, since the other lead wire is connected to a position close to the through hole on the surface opposite to the metal plate joining surface of the vibrator, the capacitance between the two lead wires can be suppressed as much as possible. Electrical matching with the oscillator that excites the transducer is easy, and the excitation efficiency of the transducer can be improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a medical ultrasonic transducer according to the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 10 denotes a disc-shaped vibrator made of quartz, PZT, or the like, in which a small hole 18 penetrating the center is formed, and electrodes are formed on the upper surface 12 and the lower surface 14 of the vibrator 10 by depositing silver. Have been. In addition,
As the size of the small hole, for example, if the diameter of the disc-shaped vibrator is 120 mm, the diameter may be 10 mm or less. 16
Is a thin metal plate such as Kovar joined to an electrode formed on the lower surface 14 of the vibrator 10, and 22b is a ground-side lead wire, which is introduced through a small through-hole 18 and whose tip is directly connected to the metal plate 16. ing. In this embodiment, the surface to which the metal plate 16 to which the ground-side lead wire is connected is the ultrasonic radiation surface 24. The inner surface of the small through hole 18 and the lead wire 22b are separated by an air layer as shown. Reference numeral 20a denotes a positive (+) side lead wire, which is connected to a position close to the small through hole 18 on the electrode formed on the upper surface 12 of the vibrator 10.

In this configuration, the ground side lead wire 22b
Is introduced from the through hole 18 of the vibrator and is directly connected to the metal plate 16, and around the lead wire in the through hole 18 is an air layer,
Since the through hole 18 is provided at the center of the vibrator 10 and is small, symmetry can be maintained and the radiation pattern of the ultrasonic wave is not disturbed. The positive (+) side lead wire 20a is connected to the vibrator
Since the connection is made at a position close to the small through hole on the surface opposite to the metal plate joining surface, the capacitance between both lead wires can be minimized.

FIG. 2 shows another embodiment in which the capacity between the ground side lead wire 22b and the positive (+) side lead wire 20a can be made smaller.

In the figure, reference numeral 16 'denotes a metal plate having a connection portion 20a' for a plus (+) side lead wire 20a and a lead-out opening for a ground side lead wire 22b connected to the metal plate 16 in the center.
It is connected to an electrode formed on the upper surface 12 of the vibrator 10.

[0013]

According to the medical ultrasonic transducer of the present invention,
One lead wire is introduced through a small hole penetrating the vibrator and is directly connected to the metal plate.Around the lead wire in the small through hole is an air layer, and an air space is formed between the inner surface of the small hole and the lead wire. It is separated by layers, and the through-hole is provided at the center of the vibrator. Since it is small, symmetry is maintained and it does not disturb the ultrasonic radiation pattern, so that uniform ultrasonic waves are generated. can do.

[Brief description of the drawings]

FIG. 1 is a plan view and a schematic front sectional view showing an embodiment of the present invention.

FIG. 2 is a front sectional view of a main part showing another embodiment of the present invention.

FIG. 3 is a plan view and a schematic front sectional view showing a conventional vibrator.

FIG. 4 is a plan perspective view showing another conventional vibrator.

[Explanation of symbols]

10: Disk type ultrasonic transducer console 12: Top surface
14: Lower surface 16: Metal plate 18: Small through hole 20a: Positive (+) side lead wire 22b: is ground side lead wire

Claims (1)

(57) [Claims] 1. A disc-shaped vibrator having a small hole penetrating at the center, a thin metal plate joined to one surface of the vibrator, and a tip introduced from the small hole and directly connected to the metal plate. One of the connected leads and the other connected to the vibrator near the small hole on the surface opposite to the metal plate bonding surface of the vibrator.
A medical ultrasonic transducer, comprising: a lead wire, wherein an inner surface of the small hole and the one lead wire are separated by an air layer.