JPH01310657A - Snare wire for high frequency excision - Google Patents

Abstract

PURPOSE:To loading the excised part of a polyp, etc., to the internal surface of a loop with being averaged and adhered by forming a snare wire with shape- storing alloy. CONSTITUTION:A snare wire 3 is formed by the shape-storing alloy and stored so as to be bent in a loop shape at an almost same temperature as a temperature in a body cavity. For example, when the polyp is excised and the snare wire 3 is protruded from the tip of a tube 1 in the body cavity, the wire is bent in the loop shape by the temperature in the body cavity and a loop 3a is formed. Then, the excised part of the polyp can be caught by this loop 3a. Since a prescribed angle is obtained between an operating wire 2 and the loop 3a, which is formed by the snare wire 3, or the snare wire 3 is bent in a prescribed shape, the excised part can be loaded to the internal surface of the loop 3a with being averaged and adhered even when the polyp is in any position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a snare wire for high-frequency ablation, which is inserted into a body cavity to ablate tissue such as a polyp.

[Conventional technology]

Conventionally, this type of snare wire for high-frequency ablation is configured such that when an operating wire is inserted into a non-conductive tube so as to be freely retractable and forward, it protrudes from the tip of the tube to form a loop. To make the snare wire form a loop like this, you need to draw the snare wire into a tube so that it bends into a loop, and when you push the snare wire out from the tip of the tube, it will return to its original loop. I'm trying to get back to normal.

[Problem to be solved by the invention]

However, with the above-mentioned conventional high-frequency snare wire for ablation, even if the operating wire is advanced and the snare wire is pushed out from the tip of the tube, there is great resistance within the body cavity.
There is a problem that the snare wire does not easily return to its original loop shape, making it difficult to capture the resected area such as a polyp. Since it is difficult to create an angle with the loop to be formed, there is a problem in that depending on the position of the resected part of a polyp or the like, the resected part cannot be placed in close contact with the inner surface of the loop.

Therefore, the snare wire for high frequency ablation of the present invention has been made to solve the above-mentioned conventional problems.

[Means to solve the problem]

Therefore, in the snare wire for high-frequency ablation of the present invention, when the operation wire (2) inserted into the non-conductive tube (1) so as to be able to move forward and backward is advanced, the snare wire
), the snare wire (3) is formed of a shape memory alloy. The memorized shape of the loop (3a) formed by the snare wire (3) may be on the same plane as the operating wire (2), or the memorized shape of the loop (3a) formed by the snare wire (3) may be , it is not on the same plane as the operating wire (2) but has a certain angle (θ), or the memorized shape of the loop (3a) formed by the snare wire (3) is a curved shape. It is assumed that

[Effect]

The snare wire for high frequency ablation of the present invention has a loop (3a) formed by the snare wire (3) as a result of applying the following means.
) can be made into a predetermined angle at a predetermined temperature or curved into a predetermined shape at a predetermined temperature.

〔Example〕

Hereinafter, embodiments of the snare wire for high frequency ablation of the present invention will be described based on the drawings.

FIG. 1 is a diagram showing the entire snare wire for high frequency ablation of the present invention. The snare wire for high-frequency ablation of the present invention includes a non-conductive tube (1) and an operating wire (
2), a snare wire (3) connected to the tip of the operating wire (2), and an operating part (4) connected to the base end of the operating wire (2), and the non-conductive tube (1)
), when the operation wire (2) inserted into the tube (1) is advanced by the operation part (4) so as to be freely retractable.
A snare wire (3) is made to protrude from the tip.

The snare wire (3) is made of a shape memory alloy,
The snare wire (3) is memorized to curve in a loop shape at approximately the same temperature as the temperature inside the body cavity.This snare wire (3) maintains a straight shape at room temperature, but when inserted into the body cavity, the temperature inside the body cavity increases. is curved into a loop shape to form a loop (3a).

2(a) and 2(b) show an embodiment in which the memorized shape of the loop (3a) formed by the snare wire (3) is on the same plane as the operating wire (2). (a
), one end of the snare wire (3) is connected to the tip of the operating wire (2), and in the embodiment shown in FIG. ) is bent and the two ends are connected.

FIGS. 3(a) and 3(b) show that the memorized shape of the loop (3a) formed by the snare wire (3) is the same as that of the operating wire (2).
This shows an example in which the snare wire (3) is not on the same plane as the snare wire (3) at the tip of the operating wire (2) in the example shown in FIG. 3(a). In the embodiment shown in FIG. 3(b), a snare wire (3) is bent and connected at both ends to the tip of the operating wire (2).

FIGS. 4(a) and 4(b) show that the memorized shape of the loop (3a) formed by the snare wire (3) is not on the same plane as the operating wire (2) but has a certain angle (θ), and This shows an embodiment in which the snare wire (3) has a curved shape. In the embodiment shown in FIG. 4(a), one end of the snare wire (3) is connected to the tip of the operating wire (2).
In the embodiment shown in Figure (b), at the tip of the operating wire (2),
The snare wire (3) is bent and its both ends are connected.

To remove a polyp, for example, using the snare wire for high-frequency ablation of the present invention configured as described above,
Operate as described below.

First, the tube (1) is inserted into a body cavity while the snare wire (3) is pulled into the inside of the tube (1), and the snare wire (3) is protruded from the tip of the tube (1) inside the body cavity. Then, this protruded snare wire (3) is bent into a loop shape by the temperature inside the body cavity, forming a loop (3a).

Next, the loop (3a) formed by this snare wire (3)
) to the stem of the polyp and capture it, then insert the operating wire (
2) is retracted by the operation part (4) and the snare wire (3)
By gradually drawing the loop (3a) into the inside of the tube (1), the loop (3a) is tightened and fixed in a state where two or three cranes protrude from the tip of the tube (1). In this case, in order to wrap the snare wire (3) around the polyp's stem so that the polyp's stem is in even close contact with the inner surface of the snare wire (3), as necessary, use the method shown in Fig. 3 (a) and (b). The embodiment shown in FIG. 4 or the embodiment shown in FIGS. 4(a) and 4(b) may be used.

Then, the polyp is strangled by applying electricity, and the protruding part of the loop (3a) formed by the snare wire (3) is pulled into the tube (1) to confirm that the polyp has been severed. Remove the tube (1) from the body cavity.

〔Effect of the invention〕

Since the snare wire for high-frequency ablation of the present invention is configured as described above, for example, when removing a polyp, the snare wire (3) is connected to the tube (1) in a body cavity.
), it curves into a loop shape depending on the body cavity temperature to form a loop (3a), and this loop (3a
) can capture the polyp resection site,
In addition, by creating a predetermined angle between the operating wire (2) and the loop (3a) formed by the snare wire (3), or by curving the snare wire (3) into a predetermined shape, you can control the position of the polyp. Even if there is, it has excellent effects, such as being able to hang the cut part so that it is in even close contact with the inner surface of the loop (3a).

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the entire snare wire for high-frequency ablation of the present invention. FIGS. 2(a) and 2(b) are perspective views of the tip of the snare wire for high-frequency ablation according to an embodiment. FIGS. 3(a), 4(b) and 4(a") and 4(b) are perspective views of the tip of the snare wire for high-frequency ablation, respectively, showing other embodiments. (1)...Tube (2) ...Operation wire (3)
...Snare wire (3a)...Lou Figure 1 Figure 2 (a) (b) Figure 3 (a)

Claims (1)

[Claims] 1. When the operating wire (2) inserted into the non-conductive tube (1) so as to be freely retractable is advanced, a loop (3a) protrudes from the tip of the tube (1). In the snare wire (3) forming the snare wire (3), the snare wire (3)
) made of a shape memory alloy. 2. Loop (3a) formed by the snare wire (3)
The snare wire for high-frequency ablation according to claim 1, characterized in that the memorized shape of is on the same plane as the operating wire (2). 3. Loop (3a) formed by the snare wire (3)
Claim 1 characterized in that the memory shape of is not on the same plane as the operating wire (2) but has a certain angle (θ).
Snare wire for high frequency ablation as described. 4. Loop (3a) formed by the snare wire (3)
The snare wire for high-frequency ablation according to claim 1, wherein the memory shape is a curved shape.