JP2001340366A - Branched artificial blood vessel and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seamless artificial blood vessel in which a branch vessel B is branched from a main vessel A, and a method of manufacturing the branched artificial blood vessel in an industrially advantageous manner. SOLUTION: Hollow weaving is carried out, in which wefts (2) are inserted into rows of warps (1) whose width is proportional to the width W of the main vessel A to form a cylindrical pipe. At this time, the part in which a branch vessel B is branched from the main pipe A is formed so that the main vessel A in this part has an unfinished pipe-like structure in which the branch vessel B side is opened. Also, the part corresponding to the cylindrical width w of the branch vessel B is formed so that they flying width of each weft (2) is made to be long to form a structure in which only the wefts (2) are woven. Subsequently, the unfinished product is newly set in a weaving machine, and the wefts (2) of the part corresponding to the branch vessel B consisting of the only the rows of wefts (2) are used as the rows of warps (1') this time to carry out hollow weaving in which the wefts (2) are inserted into the rows of warps (1'). Thus, the cylindrical branch pipe is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a main pipe A to a branch pipe B.
Is related to the artificial blood vessel divided. The present invention also relates to a method for industrially advantageously producing such a branched artificial blood vessel.

[0002]

2. Description of the Related Art As an artificial blood vessel, a tubular one made of a polymer fiber such as polyester is known. A relatively early application is disclosed in Japanese Patent Application Laid-Open No. 57-1165.
0, JP-A-59-225052, and JP-A-62-205.
0-36058, JP-A-60-77764, JP-A-60-190966, JP-A-61-4
No. 5,765, JP-A-61-92666, and the like.

[0003] Artificial blood vessels may be devised to have a bellows structure, a double wall structure, use of ultrafine fibers, or surface treatment so as not to cause kink when bent.

The shape of the artificial blood vessel is often a straight shape such as a straw. However, depending on the application site to the patient, a branched artificial blood vessel in which the main pipe A and the branch pipe B are separated may be required. is there. Therefore,
When obtaining such a branched artificial blood vessel, it is usual that a separately prepared branch pipe B is connected to a predetermined portion of the straight main pipe A by sewing.

[0005]

However, when the branch tube B is connected to the straight main tube A by sewing to form a branched artificial blood vessel, a hole must be formed in the main tube A and then the branch tube B must be connected. It cannot be seamless and causes quality problems. In addition, drilling and sewing require a high degree of skill, and the quality of the processing is difficult to be constant because there is an individual difference among processing persons. Therefore, it is necessary to make the inspection strict, and the labor required for the inspection process becomes burdensome.

In addition, in the case of a branched artificial blood vessel, the thickness of the main tube A and the branch tube B, the position of the branch tube B branched from the main tube A, and the like must be manufactured one by one according to the patient. In many cases, it is difficult to cope with manufacturing costs, labor, and delivery time (usually, there is only a few days from ordering to delivery by a doctor).

In addition, there are a main pipe A having a different diameter at one end side and the other end side, a main pipe A having a curved shape, a main pipe A having a one end side having a trouser shape, and the like. In some patients, a branch pipe B is branched from a main pipe A having a shape. However, conventionally, it has not been easy to manufacture such a complicated artificial blood vessel.

In this background, the present invention provides a seamless artificial blood vessel in which a branch pipe B is branched from a main pipe A, and a method for industrially advantageously producing such a branched artificial blood vessel. It is intended to provide.

[0009]

A branched artificial blood vessel according to the present invention is a seamless artificial blood vessel having a structure in which both a main pipe A and a branch pipe B are formed at ears by folding of a yarn at the time of weaving and weaving. It is characterized by consisting of.

The method for producing a branched artificial blood vessel of the present invention is a method for producing a branched artificial blood vessel made of woven fabric using warps and wefts. The weft (2) into the row of warps (1) having a width corresponding to the width of the warp (1) to form a tubular tube. The protruding portion has an incomplete tubular woven structure in which the main pipe A of the portion has the branch pipe B forming side open, and the portion corresponding to the cylinder width w of the branch pipe B has a flight width of the weft (2). To have a structure in which only the weft (2) is not woven,
Next, the imperfect product obtained in this manner is newly set on a loom, and the weft (2) row corresponding to the branch pipe B having the structure of only the weft (2) is changed to a warp (1 ′). ) As a row, weft weft (2 ') is inserted into it, and weaving is performed to form a tubular tube, thereby completing a tubular branch pipe B. , Both the main pipe A and the branch pipe B,
The present invention is characterized in that a seamless artificial blood vessel having a structure formed in an ear portion by folding of a yarn at the time of weaving is obtained.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. In the present invention, the term "artificial blood vessel" refers to an artificial blood vessel such as an artificial trachea, an artificial bronchus, a vascular catheter, an artificial kidney tube, an artificial heart-lung machine, a blood bypass tube, and a balloon pumping tube. Vascular-like tube ".

<Branched artificial blood vessel> As the warp and the weft, yarns made of various polymer fibers such as polyester, polyamide, polytetrafluoroethylene, and polyolefin are used. Threads other than those made of polymers, such as threads, can also be used.
Among these, it is particularly preferable to use a polyester multifilament yarn which has already been used for artificial blood vessels.

The thickness of the fibers constituting the warp and the weft is
It is optional from an extremely fine one to a moderately thick one. In addition, the thickness of the yarns made of the fibers can be appropriately set.

The branched artificial blood vessel of the present invention comprises a seamless (seamless) artificial blood vessel having a structure in which both the main pipe A and the branch pipe B are formed in the ears by the folding of the yarn during the weaving with the bag. .

Here, the sack weaving method refers to a weaving method in which a warp row is separated into front and back sides, and a weft is reciprocated spirally and woven to form a tubular structure in which the front and back sides are joined at both edges. To tell.

The woven structure by the bag weaving method is often a plain weave, but may also be a twill weave, a satin weave, or a modified structure thereof.

The main tube A and the branch tube B are relative, and any of the branched artificial blood vessels may be the main tube A or the branch tube B. The main pipe A and the branch pipe B may have the same thickness or different thicknesses. Also, the main pipe A need not necessarily be thick.

<Manufacturing Method of Branched Artificial Blood Vessel> The above-described branched artificial blood vessel is typically manufactured by a method described in detail below. FIG. 1 is an explanatory diagram showing an example of a manufacturing process of a branched artificial blood vessel of the present invention.

First, the warps (1) are arranged as shown in FIG. In (b), there is a blank area where the warp (1) is not arranged.
(However, the row of the warp (1) in the blank portion is not related to the weft insertion of the weft (2) during weaving).

Then, as shown in FIG. 1 (b), the weft (2) is inserted into the warp (1) row having a width corresponding to the cylinder width W of the main pipe A in the target branched artificial blood vessel. To perform tubular weaving to form a tubular tube.

At this time, with respect to the portion where the branch pipe B projects from the main pipe A, the main pipe A at that portion has an incomplete tubular woven structure in which the side where the branch pipe B is formed is open, and the cylindrical width w of the branch pipe B.
For the part corresponding to, the flight width of the weft (2) is increased to make the structure in which only the weft (2) is not woven. In this case, in order to fix or fold the weft (2) at the place where the flight width is increased, partial weaving or wrapping is performed by using the warp (1) row or the warp (1) on the side opposite to the main pipe A. I do.

Then, after the imperfect product obtained in this way is newly set on the loom, a portion corresponding to the branch pipe B having only the weft (2) as shown in FIG. This time, we will use the weft (2) row as the warp (1 ') row and perform weaving in which a new weft (2') is inserted into it to form a cylindrical tube. Then, the tubular branch pipe B is completed.

When an imperfect product is newly set on a loom, the jig such as a bar is fixed to the main pipe A which has already been manufactured, and the vicinity of the warp (1) on the opposite side of the main pipe A is set. Cut the weft (2) and pass through the mail there to open the weft (2) (that is, the warp (1 ')). In this case, weft insertion of a new weft (2 ') may be performed from either the free end side or the base end side of the branch pipe B forming portion (usually, due to the opening of the warp (1'), From the free end).
It is to be noted that a means for opening the warp (1 ′) without using such a method can be adopted. In addition, at least a part of the bag weaving (particularly, the final stage where it is difficult to perform opening) can be performed by hand weaving.

Finally, by cutting to a predetermined size, FIG.
As shown in (d), both the main pipe A and the branch pipe B can obtain a seamless artificial blood vessel having a structure formed in the ear portion by folding of the yarn at the time of weaving, that is, a desired branched artificial blood vessel.

In the above description, the description has been made on the assumption that the branch pipe B is branched from the main pipe A by one. However, the branch pipe B is branched from the main pipe A in one direction. B having one or more branches in one direction and in the opposite direction can be easily obtained according to the above method.

<When the main pipe A has an irregular shape>
It is also possible to make the main pipe A a modified shape. At this time, a partial row having a width corresponding to the width of the main pipe A is selected from the warp (1) row by the Jacquard method, and a weft (2) is inserted into the partial row to form a tubular pipe. The main pipe A is formed by performing the bag weaving to form the main pipe A. In the ordinary weaving method, the full width of the aligned warp rows is used,
When the main pipe A is formed into a deformed shape, a partial row having a width corresponding to the width of the main pipe A having the desired deformed shape among the aligned warp rows is used.

According to the Jacquard system, one or several warps (1) can be opened one by one, so that the partial rows can be changed every moment or at predetermined intervals. For example, a method of narrowing or widening the sub-row very slightly each time the weft (2) is reciprocated one time, and a method using a specific sub-row while the weft (2) is n reciprocated n times, Then, while the weft (2) is inserted back and forth for m rounds, a method using a narrower or wider sub-row is adopted, and a method of shifting the position of the sub-row as the weft (2) enters the weft.

At this time, the shape of the main pipe A is a curved pipe, an S-shaped pipe, a pipe whose diameter changes from the middle (a divergent pipe, a funnel-shaped pipe, a trumpet-shaped pipe, a funnel-shaped pipe, a bulging body). Tube, a narrow tube) or a trouser-type tube (trousers with the same or different lengths on both legs). A pipe whose woven structure is biased with respect to the length direction of the main pipe A (that is, an inclined pipe) can be easily manufactured, and the main pipe A thus obtained expands and contracts in the length direction and the radial direction. Is obtained.

It is to be noted that the branch pipe B can be formed into a deformed shape such that it becomes tapered or tapered by taking the same measures as the above-described method for forming the main pipe A into a deformed shape.

<Ingenuity in Manufacturing> In the present invention, various shapes, lengths, and thicknesses of the main pipe A can be formed one after another in the weaving direction of the main pipe A. On the other hand, the branch pipes B having various thicknesses, lengths, and shapes can be formed in one direction or both directions. That is, the main pipe A can be continuously woven and the branch pipe B can be formed in accordance with the order shape and the number of orders according to the patient.

When the main pipe A is continuously formed one after another in the weaving direction, a weaving portion C is formed between the main pipes A and A in the weaving direction and over the entire width of the warp (1) row. It is preferable to go. In this way, the extra yarn (warp (1) in a portion other than the partial row of the warp (1) row) in the long woven fabric after weaving is not dispersed, and the cut position of the woven fabric in the width direction is reduced. Is obvious at a glance.

In performing the weaving by the jacquard method described above, weaving information relating to artificial blood vessels of different types or sizes is stored or input into a computer, and weaving is performed based on instructions from the computer. Is particularly preferred. This makes it easy to change or re-enter variables just before weaving. In addition, it is possible to quickly cope with the production of various types, sizes, and numbers of artificial blood vessels.

After weaving, after scouring and setting, if necessary, cutting is performed so that individual artificial blood vessels are independent from the continuous fabric. The cutting at this time can be performed using a mechanical blade or scissors. However, when the warp and the weft are made of a material that can be melted by heat, the cutting can also be performed by heat cutting.

The cutting into individual artificial blood vessels from the continuous fabric can be performed not only by the manufacturer but also by the medical staff using the artificial blood vessels.

[0035]

The present invention will be further described with reference to the following examples.

Example 1 FIG. 1 is an explanatory view showing an example of a manufacturing process of a branched artificial blood vessel according to the present invention, as described above. The illustrations of “Soko” and “Osa” are omitted.

Using an ordinary loom (Jacquard system may be used), and using polyester multifilament yarns as the warp (1), (1 ') and the wefts (2), (2'), the process of FIG. In accordance with the procedure described in the above.

First, the warps (1) are arranged as shown in FIG. In addition, in FIG. 1 (a) and (b), the warp (1)
There are places where the blanks are not arranged, but there may be warps (1) that are not deposited in weaving in the blanks.

Next, as shown in FIG. 1B, the warp (1) row on the right side of the figure (the warp (1) row having a width corresponding to the cylinder width W of the main pipe A).
Then, weft weaving (2) is performed and weaving is performed to form a tubular tube.

At this time, the portion where the branch pipe B projects from the main pipe A has an incomplete tubular woven structure in which the left side of the main pipe A (the side on which the branch pipe B is formed) is open, and the tubular width of the branch pipe B is For the portion corresponding to w, the flight width of the weft (2) is increased, and it is woven and folded only with the left warp (1) row in the figure,
The structure is not woven in the middle.

Next, as shown in FIG. 1 (c), the imperfect product thus obtained is newly set on a loom, and then the weft ( The weft (2) row corresponding to the branch pipe B having only the structure of 2) is used as the warp (1 ') row, and a new weft (2') is inserted therein to form a tubular shape. The tubular weave B is completed by carrying out the bag weaving to form the tube.

When an imperfect product is newly set on a loom, the jig such as a bar is fixed to the main pipe A which has already been manufactured, and the warp (1) on the opposite side to the main pipe A is fixed. Cut the weft (2)
Open the weft (2) (that is, the warp (1 ')) through the mail or take a means to open the warp (1') without using "soko".

Finally, by cutting to a predetermined size, as shown in FIG. 1 (d), both the main pipe A and the branch pipe B have a structure formed at the lugs by folding of the yarn during weaving. Obtain an artificial blood vessel without any.

Embodiments 2 to 4 FIGS. 2 to 4 are explanatory views showing another example of the branched artificial blood vessel of the present invention.

In accordance with Example 1, a branched artificial blood vessel was manufactured. Example 2 (FIG. 2) is an example in which two branch pipes B are branched from the main pipe A in one direction, and Example 3 (FIG. 3) is the main pipe A.
Example in which each branch pipe B is branched in one direction in both directions from Example 1.
FIG. 4 shows an example in which two branch pipes B branch in one direction from the main pipe A and one branch pipe B branches in the other direction.

Embodiment 5 FIG. 5 is an explanatory view showing another example of the process for producing a branched artificial blood vessel according to the present invention.

The weaving information relating to the main pipes A of different types or sizes is stored or inputted in a computer, and the weaving is performed automatically by a jacquard system based on a command from the computer.

At this time, only the warp (1) belonging to the partial row is selected by the Jacquard method, and the weaving is performed by the bag weaving. That is, the weft (2) is weft-inserted into the partial row, and a non-bonded overlapping weave structure forming a hollow portion is formed.

In FIG. 5A, a trouser-shaped main pipe A is shown.
₁ , a funnel-shaped main pipe A ₂ and a trumpet-shaped main pipe A ₃ are successively formed. A full-width weaving section C is formed between the main pipes A, A having a different shape before and after in the weaving direction.

At this time, the portion where the branch pipe B projects from each main pipe A has an incomplete tubular woven structure in which the branch pipe B forming side of the main pipe A is open, and corresponds to the cylinder width of the branch pipe B. As for the part, the flight width of the weft (2) is increased, and it is woven and folded only with the warp (1) row at the left or right end in the figure, but it is not woven in the middle. FIG. 5
In (a), there is a blank portion where the warp (1) is not arranged at a portion corresponding to the tube width of the branch pipe B, but in practice, the blank portion is stored by weaving. There is a warp (1) that cannot be found.

Then, the imperfect product obtained in this way was set on another loom, and the weft (2) row corresponding to the branch pipe B having the structure of only the weft (2) was inserted. Is used as a row of warp (1 '), weft weft (2') is inserted into it, and weaving is performed to form a tubular pipe, and a tubular branch pipe B is completed. Let it. Finally, by performing the cut, as shown in FIG. 5 (b), a seamless artificial blood vessel having a structure in which both the main pipe A and the branch pipe B are formed at the ears by folding of the yarn during weaving is obtained. Can be

[0052]

According to the present invention, a seamless artificial blood vessel in which a branch pipe B branches off from a main pipe A can be easily obtained. The main pipe A can also have a deformed shape (if necessary, the branch pipe B can also have a deformed shape).

The branched artificial blood vessel of the present invention is applicable to patients because both the main pipe A and the branch pipe B have a seamless structure having a structure formed at the ear by the folding of the yarn during the weaving of the bag. It has excellent performance as an artificial blood vessel. In addition, the optimal shape, structure,
Sizes can be made.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a manufacturing process of a branched artificial blood vessel of the present invention.

FIG. 2 is an explanatory diagram showing another example of the branched artificial blood vessel of the present invention.

FIG. 3 is an explanatory view showing another example of the branched artificial blood vessel of the present invention.

FIG. 4 is an explanatory diagram showing another example of the branched artificial blood vessel of the present invention.

FIG. 5 is an explanatory view showing another example of the manufacturing process of the branched artificial blood vessel of the present invention.

[Explanation of symbols]

(1), (1 ') ... warp (2), (2') ... weft, A, A _1, A _2, A ₃ ... main, B ... branch pipe, C ... full width weaving section

Claims (3)

[Claims] 1. A branched artificial blood vessel characterized in that both the main pipe A and the branch pipe B are seamless artificial blood vessels having a structure formed in an ear portion by folding of a yarn at the time of weaving and weaving. 2. A method for producing a branched artificial blood vessel made of woven fabric using a warp and a weft, wherein a warp having a width corresponding to the cylinder width W of a main pipe A among target branched artificial blood vessels. The weaving of the weft (2) into the row to form a tubular tube is carried out in a bag weaving process. The main pipe A has an incomplete tubular woven structure in which the branch pipe B forming side is open, and a portion corresponding to the cylinder width w of the branch pipe B has a longer flight width of the weft (2) to increase the weft (2).
Then, the imperfect product obtained in this way is newly set on a loom, and the weft (2) corresponding to the branch pipe B having only the weft (2) is used. 2) Using the row as a warp (1 ') row, weft weft (2') is inserted into it, and weaving is performed to form a tubular tube. To complete the branch pipe B, whereby both the main pipe A and the branch pipe B obtain a seamless artificial blood vessel having a structure formed in the ear part by folding of the yarn during weaving. Manufacturing method of branched artificial blood vessels. 3. When the main pipe A has an irregular shape, a partial row having a width corresponding to the width of the main pipe A is selected from the warp (1) rows by the Jacquard method, and the weft (2) 3. The method according to claim 2, wherein the main pipe A is formed by performing weaving in which a tubular pipe is formed by weft insertion.