JPS61181452A - Discharge stone crusher - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electric discharge lithotripter that crushes stones and the like by electric discharge.

[Technical background of the invention and its problems]

Generally, an electric discharge lithotripter has a pair of electrodes, and generates an electric discharge between these electrodes to crush stones with the resulting shock wave.

As such a conventional electric discharge stone crushing apparatus, there is one shown in, for example, Japanese Utility Model Application No. 59-154215. By the way, in the conventional electric discharge lithotripter, the tip provided at the tip of the device main body in which the electrode is embedded is made of plastic. However, since the plastic tip does not have sufficient heat resistance, it may be crushed by the impact force during discharge and be scattered around.

Then, not only is there a risk that the flying debris may remain inside the patient's body, but the distal tip may become misshapen and the distance between the pair of electrodes may not be maintained constant, resulting in unstable discharge or, in the worst case, a short circuit. In some cases, discharge may no longer occur.

[Purpose of the invention]

The object of the present invention is to provide an electric discharge lithotripter that prevents the distal tip from scattering, causing harm to the patient, and preventing stable discharge conditions from being obtained.

[Summary of the invention]

This electric discharge lithotripter is designed to prevent harm to the patient or failure to obtain stable electric discharge.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Reference numeral 1 in FIG. 1 indicates a main body of the apparatus, and the main body 1 of the apparatus includes a flexible tube 2 made of, for example, plastic. A distal tip 3 is attached to the distal end of the tube 2. That is, the distal tip 3 is made of a material having electrical insulation properties, high heat resistance, and impact resistance, such as ceramic or glass, and has a columnar portion 4 having approximately the same diameter as the outer dimensions of the tube 2, and
It has a flat connecting part 5 which projects from the lower end surface of the columnar part 4 and has a width dimension that is approximately the same as the inner diameter dimension of the tube 2,
A protrusion 6 having a spherical cross section is provided in the middle of the connecting portion 5 . The distal tip 3 is provided by inserting the connecting portion 5 into the tube 2. Further, a pair of through holes 7 are bored in the columnar part 4 of the tip 3 in the axial direction, and electrodes 8 for discharge are implanted in these through holes 7 flush with the upper end surface of the columnar part 4. It is set up. Connected to these electrodes 8 are the tips of a pair of lead wires 9 inserted through the through hole 7 with their tips along both side surfaces of the connecting portion 5. These leads I! 9 is fixed to both sides of the connecting part 5 with an adhesive 1o, and a fixing ring 11 is fitted on the outer surface of the tip of the tube 2, so that the tip 3 does not come off from the tube 2. It is fixed as follows. A plug 12 is connected to the rear end of the lead wire 9, and the plug 12 is connected to a power source (not shown). Therefore, when the power source is turned on and power is supplied to the electrodes 8, discharge occurs between the pair of electrodes 8. Note that the electrode 8 and the lead wire 9 may not be separated, and the tip of the lead wire 9 may be used as the electrode 8.

According to the electric discharge lithotripter having such a structure, the tip 3
Because it has high heat resistance, it will not deteriorate due to heat during discharge or be damaged by impact. Furthermore, since the distal tip 3 also has impact resistance, it is unlikely to be damaged by this. Therefore, the distal tip 3 can maintain good performance over a long period of time without endangering the patient due to deformation or being unable to maintain the state in which the electrode 8 is held.

4 and 5 respectively show other embodiments of the invention. That is, in FIG. 4, a cylindrical recess 15 is formed on the distal end surface of the distal tip 3, and a pair of electrodes 8 are formed on the inner bottom surface of this recess 15.
I tried to expose it.

According to such a structure, when the distal end surface of the distal tip 3 is applied to the patient's body shape, the electrode 8 is prevented from directly contacting the body wall, so that safety can be improved.

In FIG. 5, a curved concave portion 20 such as a spherical surface, a paraboloid of revolution, or an ellipsoid of revolution is formed on the distal end surface of the distal tip 3. According to such a structure, the electrode 8 is similar to the embodiment shown in FIG.
Not only can the shock waves generated by the discharge be prevented from directly hitting the patient's body wall, but also the shock waves generated by the discharge can be reflected by the curved concave portion 20 and focused at the center of the concave portion 20, making it possible to crush the stone efficiently. can.

〔Effect of the invention〕

As described above, in the present invention, the tip in which the electrode is embedded is formed of a material having electrical insulation properties and high heat resistance, so that the tip tip is blown away by the heat generated when the electrode is caused to discharge. There is no possibility of damage. Therefore, unlike in the past, there is no possibility that the distal tip is damaged and scattered objects remain in the patient's body, or that the electrode cannot be held securely and the discharge becomes unstable.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the tip of the device main body showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view taken along the line ■-■ in Fig. 1. 4 and 5 are cross-sectional views of distal tips showing other embodiments of the present invention, respectively. 1... Device main body, 3... Tip tip, 8... Electrode. Applicant's agent Patent attorney Jun Tsuboi Figure 2 Figure 5 F0

Claims (1)

[Claims] 1. An electric discharge stone crushing device characterized in that a distal tip in which an electrode provided at the distal end of the device body is embedded is formed of a material having electrical insulation properties and high heat resistance.