JP2002113109A - Rolled sheath for expanding fistulous opening - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical instrument capable of suppressing an invasion to a patient to a minimum for medical treatment and forming the fistulous opening of large diameter on a human body. SOLUTION: A main body 1 of sheath is formed almost cylindrical by being wound plural times from one end of the long side of a synthetic resin rectangular thin plate. Besides, a diameter reduction preventing mechanism is arranged at each of both the terminal parts of the long side or closely thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheath for fistula dilatation, which makes it possible to minimize the invasion of a patient when a large-diameter fistula needs to be formed in a human body on medical treatment.

[0002]

2. Description of the Related Art In order to form a fistula in a human body, a conventional technique is to puncture a puncture needle, in which a sheath having a diameter of 1 French larger than that of a catheter placed in the human body is set, from the body surface into the body. With the sheath remaining, only the puncture needle is removed. Then, the catheter was inserted into the body along the remaining sheath, sterile distilled water was injected from the injection port of the catheter, the balloon provided on the catheter was inflated, and the sheath was pulled out of the body.

[0003]

The problem of the conventional technique is that when a large-diameter catheter, for example, one having a size of 16 French or more is to be placed, a puncture needle and a sheath having a size of 17 French or more must be used. No. If the puncture needle becomes thicker, there is a risk of heavy bleeding during puncture, and if puncture is mistaken, the risk of causing serious complications increases, and the invasion to the patient increases. . Therefore, there has been a demand for a technique capable of opening a hole having a size of, for example, 17 French or more in the human body by means safer than the conventional technique. The present invention is to propose a medical device that can solve the above problem.

[0004]

[Technical Means for Solving the Problems] As a result of intensive research and repeated studies for solving the above problems, the present invention was able to be solved. That is, instead of a conventional sheath, a sheath wound in a roll shape (hereinafter, abbreviated as a “wound sheath”) is set on a puncture needle, punctured into the body from the body surface, and only the puncture needle is withdrawn. Along, the winding sheath is expanded by a technique of inserting a dilator having a size of 17 French or more into the body, and a fistula having a size of 17 French or more is secured.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an outline of the embodiment, and FIG. 2 is a side view of the embodiment. The sheath body (1) is formed in a substantially cylindrical shape by winding a rectangular synthetic resin thin plate a plurality of times. The rectangular thin plate can be easily obtained, for example, by using a cutout of a cylindrical tube.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An object of the present invention is to provide a sheath having a small diameter at the time of insertion, and a sheath having a large diameter at the time of insertion into a fistula, unlike the related art. Therefore, as described above, the sheath body (1) is wound a plurality of times to form a substantially cylindrical shape. Therefore, the dilator is inserted into the body along the sheath body (1), and the wound sheath body (1) is wound. When the dilator is pulled out of the body, the sheath body (1) may try to return to the original wound state. As means for preventing this effect, as one embodiment, a locking mechanism for preventing diameter reduction is provided at both ends of the long sides of the rectangular synthetic resin thin plate or in the vicinity thereof, and the length of the rectangular thin synthetic resin plate is reduced. It is formed into a substantially cylindrical shape by winding a plurality of times from one end of the side. As a locking mechanism for preventing diameter reduction, for example, a plurality of small projections (2)
A plurality of small projections (3) on the other end or a lower surface near the other end.
Is provided, the sheath body (1) to be unwound is interfered by the small projections (2) and (3),
The expanded state can be maintained. This is an example, and the present invention is not limited to this.

In order to easily achieve the above-mentioned object, the sheath body (1) is formed of a shape memory synthetic resin, and is expanded using a dilator heated to a response temperature or higher, and the expanded state can be maintained. It is also possible to do.

Since the rectangular synthetic resin sheet is wound several times to form a substantially cylindrical shape, when the winding force is released,
In some cases, the user may try to return to the state before winding. FIG. 3 is an explanatory sectional view of a mechanism for maintaining the sheath body (1) at a small diameter. That is, as a means for keeping the wound state and keeping the sheath body (1) small, for example, a thread (4) is attached to the outer surface of the sheath body (1) to synthesize the sheath body (1) and the thread (4). It is covered with a resin skin (5), maintains a small diameter at the time of insertion, and is capable of tearing the synthetic resin skin (5) with the thread (4) to be in an expandable state before expanding with a dilator. Can be configured.

[0009]

According to the wound sheath for fistula expansion according to the present invention, the fistula can be inserted into a human body in a small diameter state and expanded to maintain the fistula, thereby reducing the burden on the patient.
It is possible to avoid complications such as bleeding and the like, and to perform a safe procedure.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an outline of an embodiment.

FIG. 2 is a side view of the embodiment.

FIG. 3 is an explanatory cross-sectional view of a mechanism for maintaining the sheath body (1) at a small diameter.

[Explanation of symbols]

 1. Sheath body 2. Small protrusions 3. Small protrusions 4. Thread 5. Synthetic resin skin

Claims (2)

[Claims] 1. A wound sheath for fistula dilatation, wherein the sheath body (1) is formed into a substantially cylindrical shape by winding a plurality of times from one end of a long side of a rectangular thin plate made of synthetic resin. 2. A sheath body (1) having a locking mechanism for preventing diameter reduction at both ends of a long side of a synthetic resin rectangular thin plate or in the vicinity thereof, and having a long side of said synthetic resin rectangular thin plate. A wound sheath for fistula dilatation, wherein the sheath is formed into a substantially cylindrical shape by being wound several times from one end.