JPH11128262A - Shape memory alloy probe for hyperthermia - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a probe to be used for hyperthermia for a position easily damaged such as mucous membrane of urethra, etc. Without damaging, by folding the tip end part constituted of a shape memory ally when inserting in/out a body cavity and restoring the original shape of a heating or perspiring part to expand. SOLUTION: The probe tip end part 1 has a structure, for instance, to restore the shape of a sphere with diameter of 15 m at 45 deg.C made of a ϕ 0.2 mm TiNi alloy wire, and the probe base part 2 is a teflon insulation coated 3 mm Cu pipe. The probe tip end part 1 and the probe base part 2 are meshanically caulked to sufficiently attain electric contact. The TiNi alloy wire is made a relatively thin wire material so that currant density is raised to generate heat by feeble current. The shape and size of the probe tip end are arbitrarily made by the size and position at the position. The electric resistance of the probe base part 2 is preferably not made large to make the applied current concentrate on the probe tip end part 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a liver tumor, a gastric tumor,
And a probe for hyperthermia used for percutaneous or laparoscopic hyperthermia treatment of a parenchymal tumor with benign prostatic hyperplasia.

[0002]

2. Description of the Related Art It is well known that a shape memory alloy such as a TiNi alloy exhibits a remarkable shape memory effect and superelasticity accompanying a reverse transformation of martensitic transformation.
Above all, TiNi alloy has excellent functions near the living environment temperature, so it is used in a wide range of fields such as microwave oven damper, air conditioner air direction control, rice cooker steam pressure regulating valve, ventilator for construction, mobile phone antenna, eyeglass frame, etc. Used in Attempts to apply it to the medical field have been made since the beginning of alloy development, and orthodontic wires, artificial roots, vasodilator coils, catheters, guide wires, and the like have been put to practical use.

[0003] Recently, surgery such as removal of organs has been performed by percutaneous surgery or laparoscopic surgery to reduce physical and mental distress to patients, from the conventional surgical laparotomy.

[0004] For example, removal of a liver tumor or a kidney tumor is performed by laparoscopic surgery in which an endoscope or forceps are inserted through several holes of about 10 mm formed in the abdomen and operated at hand. It has become. That is, the organ is cut with a scissor attached to the tip of the forceps and taken out of the body from the hole in the abdominal wall. Larger pieces are taken out of the body after being fragmented in a bag inserted into the abdominal cavity to prevent blood and cells from scattering at the time of cutting.

On the other hand, for prostatic hyperplasia, transurethral treatment is often used. That is, a treatment of resection or liquid nitrogen freezing by inserting an electric scalpel or a freezing probe transurethrally is often performed.

[0006] In addition, microwave treatment has recently attracted attention. Specifically, a probe equipped with a microwave antenna around it is inserted into the urethra and irradiated with microwaves from the antenna to perform heating treatment, or a conductor such as metal is used as part of the probe. There is a method of concentrating the heating electrolysis by using this method. In practice, transurethral hyperthermia, which heats the prostate at a temperature in the range of 41 ° C to 44 ° C, transurethral hyperthermia, which heats the prostate to 50 ° C or more to immobilize the enlarged part, and 70 ° C or more Transurethral transepidermal therapy, in which the water in the enlarged area is evaporated by heating at a high temperature, has been proposed. Transrectal hyperthermia and hyperthermia are also being studied.

[0007]

However, when organs are removed by laparoscopic surgery, there is a problem in that accidents such as severing healthy organs by the cutting operation with forceps or breaking the bag at the time of tumor fragmentation operation are likely to occur. there were. In the case of prostatic hypertrophy treatment, transurethral prostatic hypertrophy treatment had problems such as damage to the urethra.

Therefore, one technical problem of the present invention is to provide a probe which can solve these problems and reduce the burden on the patient to be treated.

Another technical object of the present invention is to provide a probe which can be used for hyperthermia treatment without damaging a susceptible site such as urethral mucosa.

[0010]

According to the present invention, there is provided a probe for percutaneously or laparoscopically evaporating an affected part in a body cavity, wherein at least the tip is formed of a shape memory alloy, Is a shape-memory alloy for thermal evaporation, characterized in that it can be folded into a small size when inserted into and removed from the body cavity, and can recover its original shape during thermal evaporation in the body cavity, thereby expanding the heat or evaporation portion. A probe is obtained.

According to the present invention, in the shape-memory alloy probe for thermal evaporation, the original shape may be spherical,
A shape memory alloy probe for hot evaporation characterized by being selected from a hemispherical shape or an elliptical shape is obtained.

Further, according to the present invention, in the shape memory alloy probe for thermal evaporation, the shape memory alloy is
A shape-memory alloy probe for thermal evaporation characterized in that the probe recovers shape at a temperature exceeding the body temperature (37 ° C.).

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view for explaining a probe according to an embodiment of the present invention. FIG. 1 (a) is a perspective view showing the shape of the probe during treatment, and FIG. It is a perspective view which shows the shape of a probe. FIG. 1 (a) and (b)
As shown in FIG. 1, the probe 10 is
It has a pipe-shaped probe base 2 and an insulating coating 3 provided on the surface of the probe base 2. Probe tip 1
Is made of a TiNi alloy wire, and has a structure that recovers a spherical shape in the present embodiment in order to enlarge the heating area.

In the present embodiment, the tip 1 of the probe is made of a TiNi alloy wire having a diameter of φ0.2 mm at 45 ° C.
The probe base 2 has a surface with a diameter of 3 mm and a Teflon coating for insulation on the surface.
It was a Cu pipe. Probe tip 1 and probe base 2
Was designed to provide sufficient electrical contact by mechanical caulking. Here, in the embodiment of the present invention, the reason why the TiNi alloy wire is made to be a relatively thin wire is as follows.
This is to increase the current density and generate heat with a weak current. The shape and size of the probe tip can be arbitrarily manufactured depending on the size of the tumor and its site. Further, it is desirable that the electric resistance of the probe base 2 does not increase in order to concentrate the current at the time of energization to the probe tip 1.

As shown in FIG. 1B, at the time of storage, the probe tip 1 is deformed at room temperature so as to fit in the storage case 4.

Next, as one application example of the probe shown in FIGS. 1A and 1B, a case where the probe is used for treatment of prostatic hypertrophy will be specifically described.

FIG. 2 is a conceptual diagram showing a first use example of the probe 10 of FIG. The probe 10 according to the embodiment of the present invention has an advantage that it can be percutaneously guided to a target site by long-wave puncture. Specifically, the probe 10 is punctured from the perineum 21, ie, between the scrotum 22 and the anus 23. Heating of the probe tip 1 disposed on the prostate 25 located at the lower part of the bladder 24 is performed by passing an electric current flowing through the probe base 2 to a return disk stretched on the back, and water vapor generated by tumor transpiration Is discharged out of the body through the hole 5 at the rear end of the probe base 2.

Further, the probe 1 shown in FIGS.
As another application example of No. 0, the case where it is used for laparoscopic surgery will be specifically described.

FIG. 3 is a conceptual diagram showing a second example of use of the probe 10 of FIG. Referring to FIG. 3, in the case of thermal evaporation of a liver tumor or a kidney tumor, the abdominal wall 26 is pierced, and a 10 mm pipe (trocar 6) penetrating the abdominal cavity 31 is passed through.
By stimulating the probe tip 1 into the tumor and energizing from the rear end of the probe base 2, the shape memory alloy wire of the probe tip 1 is heated to recover its shape, and at the same time, the tumor of the liver 27 is heated and evaporated. Let it. It is general that the probe 10 is guided into the tumor under the direct view of the CCD camera 7.

[0021]

As described above, according to the present invention, when used in laparoscopic surgery, a probe is inserted into the body through a hole provided in the abdominal wall, and the probe is inserted into a tumor, and then the tip of the probe is inserted. By expanding the diameter of the abdominal wall, the probe can be provided with a reduced burden on the patient to be treated. In other words, the probe of the present invention can reduce the insertion hole to 5 mm or less, and can eliminate the tumor in a few minutes.

In the present invention, when used for prostate surgery, a probe is inserted transperineally into the body, a probe is inserted into a prostate tumor, and the tip of the probe is expanded to thereby form a urethra. It is possible to provide a probe that can heat and evaporate in a few minutes without damaging the mucous membrane.

[Brief description of the drawings]

FIGS. 1A and 1B are views showing a probe according to an embodiment of the present invention, wherein FIG. 1A is a perspective view showing the probe during treatment, and FIG.
FIG. 3 is a perspective view showing the probe when stored.

FIG. 2 is a conceptual diagram showing a first usage example of the probe of FIG. 1, showing a case where the probe is applied to prostate treatment.

FIG. 3 is a conceptual diagram showing a second usage example of the probe of FIG. 1, showing a case where the probe is applied to laparoscopic surgery.

[Explanation of symbols]

 Reference Signs List 1 probe tip 2 probe base 3 insulating coating 4 storage case 5 hole 6 trocar 7 CCD camera 10 probe 21 perineum 22 scrotum 23 anus 24 bladder 25 prostate 26 abdominal wall 27 liver

Claims (3)

[Claims] 1. A probe for percutaneously or laparoscopically evaporating a diseased part in a body cavity, wherein at least the tip part is made of a shape memory alloy, and the tip part is inserted into the body cavity and inserted outside the body cavity. A shape memory alloy probe for heat evaporation, wherein the shape memory alloy probe is characterized in that it can be folded small when taken out and recover its original shape at the time of heat evaporation in a body cavity, thereby expanding the heat or evaporation portion. 2. The shape memory alloy probe for thermal evaporation according to claim 1, wherein said original shape is selected from a sphere, a hemisphere or an ellipse. Alloy probe. 3. The shape memory alloy probe according to claim 1, wherein said shape memory alloy has a body temperature (37%).
A shape memory alloy probe for thermal evaporation, characterized in that the probe recovers shape at a temperature exceeding (° C).