JP7126683B2 - Vascular model simulating a pseudo-lesion - Google Patents

Description

TECHNICAL FIELD The present invention relates to improvement of a blood vessel model simulating a pseudo-lesion.

A vascular model simulating a pseudo-lesion, for example, a diffuse calcified pseudo-lesion, is detachably attached to a catheter surgery simulator for training in catheter surgery.
An example of such a blood vessel model is disclosed in Patent Document 1.
In this example, a portion of a simulated blood vessel made of a plastically deformable polymer material is reduced in diameter, and the reduced diameter portion is used as a simulated lesion, and a blocking member made of an adhesive material is disposed on one side of the portion. there is
This blocking member mimics a calcified blood vessel. That is, when a catheter is passed through a pseudo-lesioned area with a reduced diameter, the diameter of the portion where the blocking member is not arranged can be expanded, and the blocking member interferes with the catheter to hinder its insertion.

JP 2011-027795 A

The blood vessel model simulating the calcification pseudo-lesion having the above configuration is incorporated into the catheter surgery simulator as a linear model exclusively.
However, when trying to apply such a model to a curved blood vessel model, the following problem arises.
Due to the presence of the blocking member, the blood vessel model itself is less likely to bend than a real blood vessel. In particular, the characteristics change greatly at the boundary (axial direction) between the portion with the blocking member and the portion without the blocking member, so when the catheter is passed through this, stress concentrates on the portion where the blocking member is not arranged, There was a possibility that the function as a simulator might not be exhibited.
In addition, when the simulated blood flows through the blood vessel model, depending on the material of the blocking member, there is a possibility that the blocking member may be peeled off or worn away by the blood flow.

The present invention has been made in view of the above problems, and a first aspect thereof is defined as follows. Namely
a blood vessel wall made of an elastic material;
and a pseudo lesion inserted into the blood vessel wall,
A blood vessel model simulating a pseudo-lesion, wherein the pseudo-lesion includes a coil spring.
According to the blood vessel model configured in this way, a coil spring is arranged in the pseudo-lesioned area. When a force is applied to the coil spring, the stress is distributed all over, making it closer to the behavior of a real blood vessel. Since the entire portion where the coil spring is inserted bends evenly, there is no large difference in the way of bending (curvature) at the boundary between the portion where the coil spring is inserted and the portion where the coil spring is not inserted.
Further, by adjusting the outer diameter of the coil spring, even if there is a strong flow of simulated blood, it will not shift downstream.

FIG. 1 is a cross-sectional view showing the configuration of a blood vessel model imitating a pseudo-lesion according to an embodiment of the present invention. FIG. 2A shows a side view and a front view of a silicone resin ring, and FIG. 2B shows a side view and a front view of a glass ring.

MODE FOR CARRYING OUT THE INVENTION

The blood vessel wall is made of elastic material such as silicone rubber. In addition, resin materials such as polyethylene and polypropylene, elastomer materials such as polyurethane and polyamide, and the like can be used.
The length, inner diameter, and wall thickness of the vascular wall can be arbitrarily designed according to the part of the blood vessel to be trained and the type of lesion to be simulated.
The material of the vessel wall is preferably light-transmissive so that the insertion state of the catheter can be visually observed.

The spring constant and length of the coil spring forming the pseudo-lesion can be arbitrarily set according to the flexibility required for the blood vessel model. The outer diameter of the coil spring is preferably equal to the inner diameter of the blood vessel wall.
Any material such as metal, resin, or ceramic can be selected as the material of the coil spring, but it is preferable to use resin from the standpoint of transparency and transmission of X-rays.

The coil spring is wrapped in a highly viscous material such as silicone gel or a general adhesive material (lesion representation material), in other words, the coil spring is embedded in the lesion representation material to form a pseudo-lesion. be able to.
When the inner peripheral surface of the coil spring is exposed, it is preferable to cover the wire rod of the coil spring with resin or another material having good slidability.

According to studies by the present inventors, it is also possible to insert rings made of various materials into each pitch of the spiral of the coil spring, and use these rings as lesion representation materials.
It is preferable that the outer diameter of this ring is the same as or slightly larger than the inner diameter of the blood vessel wall so that it is tightly fitted to the blood vessel wall, but it is not limited to this. The inner diameter of the ring can be appropriately selected according to the lesion to be simulated. For example, when simulating a stenosis of a blood vessel, the inner diameter should be half to 1/3 of the outer diameter. Needless to say, a diameter through which the catheter can be inserted is secured.
The width of the ring should be the same as or slightly larger (1 to 1.5 times) than the pitch of the coil spring so that the spring constant of the coil spring is not affected.

Different types of rings can also be fitted into the coil spring. Here, different types of rings refer to different materials and shapes (outer and inner diameters, widths, etc.). When different types of rings are fitted into the coil spring, they may be arranged regularly (for example, staggered), but the arrangement may be arbitrary.

Examples of the present invention will be described below.
FIG. 1 is a cross-sectional view showing the configuration of a blood vessel model 1 of an embodiment.
This blood vessel model 1 includes a blood vessel wall portion 3 and a pseudo lesion portion 10 . The blood vessel wall portion 3 consists of a silicone rubber tube. The hardness is about 50 in durometer hardness type A, preferably 20 to 50, the inner diameter is 3.0 mm, and the average film thickness is 0.5 mm.
A pseudo-lesioned area 10 includes a coil spring 11 and two types of rings 15 and 17 .
The wire of the coil spring 11 was made of stainless steel, and had a thickness of 0.3 mm, an outer diameter of 3.0 mm, and an inner diameter of 1.0 mm. The pitch was 1.0 mm and the total length was 15 mm.
The ring 15 is made of silicone resin and has a width of 1 mm, an outer diameter of 3 mm, and an inner diameter of 1 mm, as shown in FIG. 2A. The hardness is preferably the same as that of the blood vessel wall 3, and is 20 to 50 for the same type A.
The other ring 17 was made of glass and had a width of 1.2 mm, an outer diameter of 2.8 mm and an inner diameter of 1.2 mm, as shown in FIG. 2B.
In the diffuse calcified lesion, matrix plaque (elastic and prone to plastic deformation) and calcification are mixed, and unevenness is formed inside. It is excellent as a pseudo-lesion for calcified lesions.

These two types of rings 15 and 17 are alternately fitted into the coil spring 11 as shown in FIG.
In this way, by arranging the rings of different materials and inner diameters in the axial direction of the blood vessel model at regular intervals (the line width of the coil spring 11) and fixed (so as not to move in the axial direction), a pseudo-lesioned area for the catheter can be obtained. 10 interference conditions can be arbitrarily designed. According to studies by the present inventors, the resistance to the catheter can be adjusted by arranging rings with different inner diameters. In addition, by adopting a ring made of a different material, especially an inorganic material, the insertion feeling of the catheter becomes closer to that of a realistic calcified lesion.

The present invention is by no means limited to the description of the above embodiments and examples of the invention. Various modifications are also included in the present invention within the scope of those skilled in the art without departing from the description of the claims.

1 Blood vessel model 3 Blood vessel wall portion 10 Pseudo-lesion portion 11 Coil spring 15, 17 ring portion

Claims (6)

a blood vessel wall made of an elastic material;
and a pseudo lesion inserted into the blood vessel wall,
A blood vessel model simulating a pseudo-lesion, wherein the pseudo-lesion includes a coil spring. 2. The blood vessel model according to claim 1, wherein said simulated lesion comprises said coil spring and a ring-shaped member fitted between wires of said coil spring. 3. The blood vessel model according to claim 2, wherein the ring-shaped member includes a first ring and a second ring, and the first ring and the second ring are made of different materials. 4. The blood vessel model according to claim 2, wherein said ring-shaped member includes a first ring and a second ring, and said first ring and said second ring have different inner diameters . The blood vessel model according to claim 3 or 4, wherein the first ring and the second ring are fitted to the coil spring alternately. 2. The blood vessel model according to claim 1, wherein said pseudo-lesioned portion comprises said coil spring and a lesion representation imparting material surrounding said coil spring.

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