JPH02220672A - Laser fiber catheter - Google Patents

Abstract

PURPOSE:To shorten a treatment time and to reduce the pain of a patient by covering the leading end part of a laser fiber with a fine diameter spiral pipe formed by winding a metal wire body to form a flexible leading end guide part having an outer diameter of a specific value or less. CONSTITUTION:The leading end part 1a of a laser fiber 1 is covered with a fine diameter spiral tube 2. The fine diameter spiral tube 2 is formed by winding a metal wire body composed of stainless steel and the outer diameter dimension thereof is set to 1.0mm or less. The leading end of the spiral tube 2 is fixed to the laser fiber 1 by an adhesive S such as an epoxy resin and the base end thereof is inserted in the opening part 4a at the leading end of an intermediate coating pipe 4 to be fixed thereto. Therefore, this leading end guide part 5 becomes a flexible part deformable in a curved state to prevent the invasion of blood or body fluid in the intermediate coating pipe 4. By this method, this catheter can be inserted in the body without using a guide wire and the laser fiber itself acts as a tension member and can be drawn out of the body.

Description

[Detailed description of the invention] [Industrial application field] FIELD OF THE INVENTION The present invention relates to laser fiber catheters.

[Problems to be solved by conventional techniques and inventions] Generally,
When inserting a catheter (laser fiber catheter) into the body, first insert a guidewire, insert a guidewire tube into the body while fitting the guidewire tube externally, and then take only the guidewire out of the body. It was removed and a catheter was inserted into the guidewire tube.

That is, when inserting a catheter, a separate guide wire is required, and after inserting the wire, the wire must be pulled out again, which is troublesome and takes a lot of time, and is painful for the patient. It was something.

Therefore, an object of the present invention is to provide a laser fiber catheter that does not require a guide wire.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the laser fiber catheter according to the present invention has a laser fiber distal end portion formed by a narrow diameter spiral tube wound with a metal wire body. Covered, outer diameter 1. (1+m or less) (A ridged tip guide part is formed.)

[For production]

Equipped with a flexible tip guide part with an outer diameter of 1.0 mm or less,
Further, since the small diameter spiral tube for forming the guide portion covers the tip of the laser fiber, it can be directly inserted into the body without using a conventional guide wire. And the laser fiber itself can act as a tension member for a conventional guide wire and be withdrawn from the body.

〔Example] Examples will be described below with reference to the drawings.

1 and 2 show a laser fiber catheter according to the present invention, which includes a laser fiber 1 disposed over almost the entire length, and a distal end 1 of the fiber.
a small-diameter spiral tube 2 that covers the fiber 1; a protective tube 3 that covers the fiber 1 from the middle to the base of the fiber 1;
An intermediate covering tube 4 that covers the fiber 1 between the protective tube 3 and the small diameter spiral tube 2 is provided.

As shown in FIG. 1, the small-diameter spiral tube 2 is formed by winding a metal linear body made of stainless steel or the like in stages, and has an outer diameter of 1.0 ms+ or less. Moreover, this spiral tube 2 may be coated with plastic. And the spiral tube 2 is
The tip is fixed to the laser fiber 1 with an adhesive S such as Evokin resin, and the base end is attached to the tip opening 4a of the intermediate cladding tube 4.
It is inserted and fixed inside. Note that the intermediate cladding tube 4 and the small diameter spiral tube 2 are sealed. Therefore, the flexible tip guide portion 5 having an outer diameter of 1.0 am or less is formed in this small diameter spiral tube 2. In other words, this tip guide portion 5
As shown by the imaginary line in the figure, it is a flexible portion that can be curved and deformed.

Further, the intermediate cladding tube 4 is made of a metal tube such as stainless steel. In this case, it is also preferable to coat the metal tube with Teflon.

Then, connect the tip of the intermediate cladding tube 4 to the proximal end of the protective tube 3 to the first
As shown in the figure, the intermediate cladding tube 4 and the protective tube 3 are connected to each other by being covered with a covering 6 and bonded with an adhesive. Note that this covering 6 is made of, for example, vinyl chloride, metal, or the like.

7 is the inner circumferential surface 3a of the protective tube 3 and the outer circumferential surface 4b of the intermediate cladding tube 4.
A spacer that is inserted and fixed between the two, and is integrally bonded with an adhesive. Further, in this case, the protective tube 3 is a metal spiral tube coated with plastic, and a connector 10 is connected to the proximal end thereof.

Therefore, the catheter configured as described above does not require a guide wire and can be inserted into the body immediately. The tip end becomes a flexible tip guiding section 5, and the laser fiber itself acts as a tension member, so that this catheter itself can be smoothly inserted into the body like a conventional guide wire. It is.

Thus, in the embodiments described above, a quartz fiber is used as the laser fiber, but in the one shown in FIG. 3, something other than a quartz fiber is used. That is, in the fiber shown in FIG. 3, chalcogenide glass or fluoride glass is used for the core. Therefore, in this case, a window member 8 made of a zinc-selenium compound is provided on the end face of the fiber where the core is exposed, such as when the fiber is turned.

That is, since the core of the fiber 1 is water-soluble, it needs to be waterproof, and furthermore, since the core has a low heat resistance, it is necessary to prevent the end face from melting due to heat generated by laser irradiation.

Next, FIG. 4 shows a modification of the connecting portion between the intermediate cladding tube 4 and the small-diameter spiral tube 2, and FIG. [respectively, intermediate cladding tube 4
and the small-diameter spiral tube 2, but in FIG. 4I, the intermediate y1. They are connected via a sleeve 9 that is glued to the tip of the cover tube 4 to the base end of the spiral tube 2, and the inside of the sleeve 9 is filled with an adhesive S for sealing.

In addition, in Fig. 4 ■, the cladding tube 4, the spiral tube 2, and the fiber l
are adhered with adhesive S, and similarly sealed to prevent blood, body fluids, etc. from entering the intermediate cladding tube 4.

Further, FIG. 5 shows a modified example of the thin spiral tube 2, and the spiral tube 2 in this case is formed by winding a metal linear body whose cross-sectional shape continuously changes from a circular shape to a flat shape. Therefore, the spiral tube 2 becomes more flexible toward the tip, like a so-called fishing rod, and does not bend locally. However, this linear body is made by sequentially changing the degree of rolling of a linear body with a circular cross-sectional shape using rolling rolls to gradually change the cross-section from a circular shape to a flat shape. (
This is because the flat shape is more reliable than the circular shape due to characteristics (characteristics).

Note that the present invention is not limited to the above-described embodiments, and the design may be changed without departing from the gist of the present invention. It is also preferable that
Since the connection between the intermediate cladding tube 4 and the small diameter spiral tube 2 is made of metal such as stainless steel, it is preferable to perform soldering or the like.

Furthermore, the length and outer diameter of each of the protective tube 3, cladding tube 4, and spiral tube 2 are free. Of course, the outer diameter of the guide portion 5 formed by the spiral tube 2 is 1.0 m or less. Specifically, for example, the length from the connector IO to the sheath 6 is about 1500 mya, and the length L2 from the sheath 6 to the tip of the sheath 4 is about 1300 mya.
1 mm, the length Lff from the tip of the cladding tube 4 to the tip of the helical tube 2 (that is, the length of the flexible tip guide section 5) is approximately 20 On+m, and the outer diameter of the protective tube 3 Dimensions: 2. OOam, the outer diameter D2 of the cladding tube 4 is approximately 0°51111, and the outer diameter of the guiding portion 5 is approximately 0.45 m.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

This laser fiber catheter itself functions as a guidewire and can be inserted directly into the body.

Therefore, there is no need for a separate guide wire as in the past.
There is no need to insert or remove a guide wire, which can significantly shorten treatment time and reduce patient pain.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of main parts showing one embodiment of the present invention;
The figure is an overall side view, FIG. 3 is an enlarged cross-sectional view of the flexible tip guide part of another embodiment, FIG. 4 is an enlarged cross-sectional view of the main part of a modified example, and FIG. FIG. 3 is an enlarged sectional view showing an example. 1a...Laser fiber tip, 2...Small diameter spiral tube, 5...Flexible tip guide section.

Claims (1)

[Claims] 1. A laser characterized in that the tip of the laser fiber is covered with a small-diameter spiral tube formed by winding a metal linear body to form a flexible tip guide portion with an outer diameter of 1.0 mm or less. fiber catheter.