JPS62213749A - Cauterizing probe apparatus - 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 [Field of Industrial Application] The present invention relates to an ablation probe device capable of heating a target site within a body cavity to stop bleeding or treat it.

[Problems to be solved by conventional techniques and inventions] In recent years,
2. Description of the Related Art Endoscopes are widely used, which allow diagnosis or treatment within a body cavity by inserting an elongated insertion portion into the body cavity without requiring an incision from the body surface.

In addition to the observation means, this endoscope is generally equipped with a hollow channel through which various treatment instruments are inserted. Xi's eyes? Various treatments can be performed under the supervision of JIN.

By the way, 11 inside the body cavity! For example, as a means to stop the bleeding of a tumor, etc., which has been excised or removed, a cautery probe that can be inserted through the channel of an endoscope is used.
Cautery hemostasis means are known that coagulate blood by heating the bleeding area.

However, since the ablation probe is used by pressing the heating part at the tip, which is formed into a hemispherical shape, against the target area such as a bleeding area, it is possible to heat only the surface of the target area. It was not possible to heat the deep part of the body part.

By the way, as a method for destroying in-vivo tissues specialized in cancer, Destruction! There is a method (called hyperthermia) in which only the i11 fabric is selectively heated for a long time. Conventionally, as a means for selectively heating only such tissues to be destroyed, for example, Japanese Patent Publication No. 59-23
Publication No. 809 discloses a technique in which a one-shaped body is inserted into a living body and heated by a heating element to locally heat a specific site within the living body. Also, Utsukai Showa 60-5
No. 2805 and No. 60-52806 disclose that a tubular electrode is inserted into a living body and microwaves are used to
A technique for locally heating a specific region has been disclosed.

However, in these prior art examples, since the needle-shaped body or tubular electrode is always exposed, there is a risk of damaging living tissue other than the target site. In addition, in the case where the heating part at the tip of the ablation probe is formed into a needle shape, if the nail-shaped heating part is exposed, the inside of the channel of the endoscope may be damaged when the probe is inserted into the channel. There is a risk.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and provides an ablation probe device that can heat deep into a target region and that does not have the risk of touching living tissue, etc. other than the target region. The purpose is to

[Means and effects for solving the problems] The ablation probe device according to the present invention has a heat generating means at the distal end on the right side b, and a needle-like member housed in the distal end so as to be able to protrude and retract. , and means for projecting and retracting the nail-like member.

That is, when heating the deep part of the target area, a needle-like member is protruded from the tip, and by inserting this needle-like member into the target part, the deep part can be heated, and the other parts can be heated. Sometimes, the nail-like member is retractable into the tip.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIGS. 1 to 5 relate to the first embodiment of the present invention.
The figure is a cross-sectional view showing the distal end side of the cautery probe device with the nail-like member protruding from the distal end, FIG. 2 is a perspective view showing the overall configuration of the cautery hemostasis device, and FIG. 4 is a sectional view taken along the line B-B in FIG. 1, and FIG. 5 is a sectional view not showing the distal end side of the ablation probe device with the needle member recessed into the distal end portion.

In these figures, reference numeral 1 denotes a cautery hemostasis device to which the cautery probe device of this embodiment is applied, and this cautery hemostasis device 1 includes a power supply box 3 provided with an operation panel 2 on the front side, and a power supply box 3 provided with an operation panel 2 on the front side. an ablation probe device 6 of the present embodiment which is detachably connected to an electrical connector 4 and a water supply connector 5; a foot switch 9 which is detachably attached to the power supply box 3 via a connector 8 provided on a cable 7;
It consists of a wash water tank 10 that can be detachably attached to the side of the power supply box 3.

The ablation probe device 6 includes an elongated and flexible sheath 11, an ablation probe 12 connected to the tip of the sheath 11, and the electrical connector 4 and water supply connector 5 installed on the base side of the sheath 11. consisting of a sheath 11
The ablation probe 12 at its tip can be inserted into the handling channel 1/channel of the endoscope 41, and the ablation probe 12 is inserted into the body cavity 42 through this channel.

A coaxial cable 13 is inserted into the sheath 11 in the axial direction and energized to a heating element 14, such as a Zener diode, installed inside the cauterizing bulb O-bu 12 at the tip. Further, a water supply channel 16 is formed in the direction of the outer circumferential axis of the coaxial cable 13 within the sheath 11 to forcefully feed cleaning water to a plurality of nozzles 15 formed on the outside of the ablation probe 12 .

Then, connect the electric connector 4 and water supply connector 5 on the base side of this ablation probe device 6 to the power supply box 3,
In addition, the foot switch 9 also connects the connector 8 of the cable 7 to the power supply box 3, and this 711flT! While turning on the main switch 3a of the box 3, the heating amount and water supply area setting button 2a provided on the operation panel 2,
2b is selected and set, by pressing the wash water supply side switch 9a of the foot switch 9, a water pump (not shown) installed in the power supply box 3 is operated to supply the wash water in the wash water tank 10 to the sheath. Water supply channel 1 in 11
Water is sent from the nozzle 15 on the outer periphery of the ablation probe 12 at the tip toward the affected area in the body cavity through the water pipe G to wash away blood, etc. in the body cavity, or by pressing the heating switch 9b side of the foot switch 9, the inside of the sheath 11 coaxial cable 1
3, the heating cord 14 in the ablation probe 12 at the tip is energized to heat it to a predetermined temperature.

The details of the ablation probe 12 on the distal end side of the ablation probe 6 in this embodiment are constructed as shown in FIG. 1 and FIGS. 3 to 5.

That is, an elongated flexible sheath 11 such as a Teflon sheath
A main body 18 having a through hole 17 in the solid axial direction is connected and fixed to the tip of the main body 18, and a heat transfer surface is provided on the outer periphery of the main body 18, the tip of which is pressed against a wound etc. to cauterize and solidify the 10 wounds etc. A hollow cylindrical cap 19 having a substantially hemispherical shape and having good thermal conductivity is attached and fixed as 19a via a cylindrical ring 20 having electrical conductivity. This kib V-tube 19 is provided with a non-adhesive coating, for example, a Teflon coating (Silverstone coating), to prevent tissue from sticking during heating. Also,
On the tip side of the cylindrical ring 20, there is a -t-1 ship 19.
Insulating knob 21 with good heat conduction shaped along the inner surface of
are installed in succession. Further, a guide hole 23 is formed at the center of the tip of the cautery probe 12, which is made up of the claw/tube 19 and the insulating cap 21, through which a needle portion 22a of a needle-like member 22, which will be described later, is inserted.

Inside the tip of this ablation probe 12 is a disc-shaped base 2.
A needle-like member 2 with an 11 part 22a standing upright at the center of the front surface of 2b.
2 is disposed with a 15 needle portion 22a inserted into the guide hole 23. The needle portion 22a has [
A non-adhesive coating such as Teflon coating (Silverstone coating) is applied to prevent the 111 from sticking and to improve lubricity with the guide hole 23.
is applied.

The heating element 14 is fixed to the surface of the base 22b opposite to the tray 1 part 22a through an insulating plate 24 having thermal conductivity and a contact spring 25 having thermal conductivity and electrical conductivity. There is. The heat generated by the heating cord 14 is transmitted to the needle member 22 via the contact spring 25 and the insulating plate 24. Further, the heat transferred to this needle-like member 22 is transferred to the insulation cap 21 or the coil spring 28 and the insulation cap 1! It is also transmitted to the cap 19 via the knob 21.

The contact spring 25 is formed, for example, in the shape of a disk with a bent outer end, and by contacting the inner peripheral surface of the cylindrical ring 20, the contact spring 25 is coaxial with the distal end surface of the heating element 14. The outer body of the cable 13 and the cylindrical ring 20
and are electrically connected via the main body 18. Further, the contact spring 25 connects the sword-shaped member 22 to the cautery probe 1.
2. It is held so that it is near the axis within the tip. The needle member 22 is connected to the contact spring 25 and the guide IL2.
3 and is recessed so that it can be moved in the axial direction to project and retract the needle portion 22a.

On the other hand, at the distal end side of the main body 18, four parts 18a are formed which are connected to the through hole 17, and the coaxial cable 13 passed through the sheath 11 is inserted into the through hole 17. portion protrudes from the distal end surface of the main body 18.

A power transmitting coil 26 is interposed on the outer periphery of the inner conductor at the tip of the coaxial cable 13, and the power transmitting coil 26 electrically connects the rear end surface of the heating element 14 and the inner conductor of the coaxial cable 13.

Furthermore, an insulating tube 27 such as a cylindrical glass duplex, one end of which is fixed to the rear end surface of the heating element 14, is interposed on the outside of the power transmission coil 26.

Further, a coil spring 28 with good thermal conductivity is disposed between the end surface of the base 22b of the needle member 22 on the needle portion 22a side and the inner surface of the tip portion of the insulating cap 21. This coil spring 28 allows the needle-like member 22 to
In a normal state, the needle portion 22a is recessed inward from at least the distal end surface of the ablation probe 12.

Further, one end of two wires V729.29, for example, is fixed to the end surface of the base 22b of the needle member 22 on the side of the needle portion 22a. This wire 29.29 is connected to the hole 21a provided in the insulating cap 21.

21a1 is connected to the handle 31 as shown in FIG. There is. Then, by operating this handle 31 and pulling the wire 29.29, the coil spring 2
8 to the distal end side, the needle portion 22a is cauterized and protruded from the cauterization probe 12 as shown in FIG. Further, when the wires 29 and 29 are not being pulled, the separate member 22 is biased backward by the coil spring 28, so that the needle portion 22 is pushed backward as shown in FIG.
a is adapted to be immersed into the ablation probe 12.

Further, on the outer circumference of the ablation probe 12, for example, four nozzles 15 are formed in the shape of a groove in the axial direction, as shown in FIG. It is connected to 16.

Next, the operation of the embodiment configured as above will be explained.

To heat the deep part of the target region within the body cavity 42, the sheath 11 and the cautery probe 12 are inserted endoscopically into the body cavity 42 while the needle portion 22a of the separate member 22 is not inserted into the cautery probe 12. is inserted, and the distal end surface of the ablation probe 12 is brought into contact with or approaches the target site. Then, by operating the handle 31, the wire 29 is pulled, the needle member 22 is moved toward the distal end, the needle portion 22a is projected from the cautery probe 12, and the needle portion 22a is inserted into the target site. . In this state, electricity is applied to the heating element 14 to prevent it from generating heat. The heat generated by this heating element 14 is
The needle member 22 is connected to the needle member 22 via the contact spring 25 and the insulating plate 24.
The needle portion 22a of the needle member 22 heats and covers the deep part of the target area.

As described above, according to this embodiment, it is possible to heat the deep part of the target region within the body cavity, so that the above-mentioned hyperthermia can also be performed.

In addition, in this embodiment, the needle portion 22a is connected to the cautery probe 1.
2, the distal end surface of the ablation probe 12, that is, the heat transfer surface 19a, is brought into contact with the target area, and the heating element 14 is energized to generate heat, through the needle-shaped member 22 and the insulating cap 21. , or needle-like member 22,
The heat transferred to the cap 19 via the coil spring 28 and the insulating cap 21 heats the surface of the target area in the same way as in the conventional method, thereby making it possible to perform treatments such as hemostasis.

According to this embodiment, the needle portion 22a of the needle-like member 22 can be inserted into the ablation probe 12 when the deep part of the target region within the body cavity 42 is not being heated. It is safe as there is no risk of damaging the inside of the neck channel or the inside of the body cavity.

FIG. 6 is a sectional view showing the distal end side of the ablation probe device according to the second embodiment of the present invention.

In this figure, the same members as in the first embodiment are given the same reference numerals, and their explanations will be omitted.

In this embodiment, a coil made of a shape memory alloy is used instead of a wire as a means for moving the needle member 22 in the axial direction.

In this embodiment, a shape memory alloy coil 32 is disposed between the tip surface of the main body 18 and the contact spring 25, and its both ends are fixed to the tip surface of the main body 18 and the contact spring 25, respectively. The shape memory alloy coil 32 has two shapes memorized, such that the length in the axial direction is short at room temperature and becomes long at high temperatures when the heating element 14 is energized to generate heat.

In other words, when the heating element 14 is not energized to generate heat,
The shape memory alloy coil 32 has a short shape, and the needle portion 22a of the needle member 22 is in a state inserted into the ablation probe 12.

On the other hand, when the heating element 14 is energized and generates heat, the shape memory alloy coil 32 changes into a long shape due to the heat and moves the needle member 22 toward the distal end.
a protrudes from the ablation probe 12, so that it is possible to heat the deep part of the target region as in the first embodiment.

In this embodiment, since the needle part 22a of the public part 4422 is immersed in the ablation probe 12 when not heating,
Safety when inserting the ablation probe device 6 into the treatment instrument channel of the endoscope 41 or into the body cavity is improved.

FIG. 7 is a sectional view showing the distal end side of the ablation probe device according to the third embodiment of the present invention.

In this embodiment, similarly to the second embodiment, a coil made of shape memory alloy J is used to move the nail-like member 22 in the axial direction.

In this embodiment, a shape memory alloy coil 33 is disposed between the end surface of the insulating plate 24 and the inner surface of the end portion of the insulating cap 21, and has both ends thereof fixed thereto. This shape memory alloy coil 33 has a long axial length at room temperature;
Two shapes are memorized so that the length becomes shorter when the heating element 14 is energized and generates heat at a high temperature.

However, unless the heating element 14 is energized and generates heat,
The shape memory alloy coil 33 has a long shape, and when the needle portion 22a of the needle member 22 is inserted into the cautery probe 12 and the heating element 14 is energized to generate heat, the shape memory alloy coil 33 is caused by this heat. In order to change the shape to a shorter shape and move the T1-shaped member 22 toward the distal end, the needle portion 22
a protrudes from the ablation probe 12.

Other functions and effects are similar to those of the second embodiment.

Note that the present invention is not limited to the embodiments described above, and various modifications are possible. For example, the heating means may be a positive characteristic 1 nermistor, a heating coil, a high frequency current, or the like.

Furthermore, the means for protruding and retracting the needle-like member may be an electromagnet or the like.

Further, the device according to the present invention can perform various treatments such as hemostasis and cancer treatment by changing the temperature of the heat generated.

[Effects of the Invention] As explained above, according to the present invention, there is an effect that heating can be performed to the deep part of the target region, and there is no damage to living tissue, etc. other than the target region.

[Brief explanation of drawings]

FIGS. 1 to 5 relate to the first embodiment of the present invention.
The figure is a sectional view showing the distal end side of the ablation probe device with the needle-like member protruding from the distal end, FIG. 2 is a perspective view showing the overall configuration of the cautery hemostasis device, and FIG. 4 is a sectional view taken along the line B-B in FIG. 1, and FIG. FIG. 6 is a sectional view showing the distal end side of the ablation probe device according to the second embodiment of the present invention, and FIG. 7 is a sectional view showing the distal end side of the ablation probe device according to the third embodiment of the present invention. 1... Cauterization hemostasis device 6... Cauterization probe device 1
1... Sheath 12... Cauterization probe 13.
... Coaxial cable 14 ... Heating element 19 ... Key 1
? Tube 20... Cylindrical ring 21... Insulating cap 22... Needle member 22a... Needle part 2
3...Guide hole 25...Contact spring 26...
Power transmission coil 28...Coil spring 29...Wire 30...Guide groove 31...Handle 32.3
3... Shape memory alloy coil 41... Endoscope

Claims (1)

[Claims] In an ablation probe device having a heating means at the tip,
An ablation probe device comprising: a needle-like member that is housed in the distal end section so as to be protrusive and retractable, and that heats a target region with the heat generating means; and means for projecting and retracting the needle-like member.