JPS60500520A - vascular prosthesis - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] name of invention vascular prosthesis The invention particularly relates to junctions or bypasses between blood vessels, especially veins and arteries. and a new type of vascular prosthesis for use as a vascular prosthesis.

In medical technology, introducing vascular prostheses, so-called bypasses, between blood vessels Comparatively for drainage of blood for analytical testing or purification purposes. often required. This 9-pass which can be inserted for a long time is the next intended eye. Used as a blood drainage site for targets. Patients with impaired renal function Especially in so-called hemodialysis performed on patients, especially in so-called artificial kidneys. inserted blood vessels used at regular intervals up to several times each week in connection with blood purification The use of prostheses or bypasses is common.

However, known vascular prostheses or Bypassing is likely to cause serious inconvenience. Vascular prostheses are usually so-called xenografts. a heterograft, i.e. of animal origin, such as a cow, sheep, or pig; A piece of blood vessel taken from is used. Such xenografts treated in a special way are It is called Xenograft and its purpose is to withstand long-term insertion. and chemically or physically obtained from animals for the purpose of constructing tissue-compatible materials. Consists of treated blood vessels. Such a / + path is removed at one end by surgical operation. for example into an artery in the patient's arm and the other end into a vein, and in this way The two blood vessels are connected for intermittent drainage of blood, purification of drained blood, and Allowing the return of such blood to the patient's blood system.

However, there are concerns regarding the use of such types of connecting pieces for joining arteries and veins. There are also practical problems that can be raised below.

A tube that is surgically inserted under the skin in connection with blood drainage is a cannibal. It is pierced by Yule. After repeated drainage, the bypass loses its elasticity. If the cannula is removed after blood processing is completed, blood analysis will not be possible. Coagulate the blood by the conventional method in the same way as in the conventional blood trainer Raku. It is necessary to apply pressure to the drainage area. The bypass material is the bullet. If you have lost your sex, apply external pressure to the bypass to coagulate the blood, and then If the pressure on the bypass or vascular prosthesis is relieved, the latter will return to its normal state. It does not return to the inflated position, but instead remains in the compressed position, thereby improving blood circulation. It means disturbing it.

Another problem with the use of this type of vascular prosthesis is that one end of the prosthesis to the venous tissue due to blood flow diverted from the bypass in relation to the surgically inserted area. Due to the influence of Experiments have shown that this, among other things, It is shown that the so-called stenosis is formed in the veins inside the meter.

The present invention provides a vascular prosthesis in which the problems noted above are eliminated or substantially reduced. have a purpose to provide.

Another object of the invention is to act in particular as a binoculars for connecting arteries to veins. The object of the present invention is to provide a method for applying such a vascular prosthesis.

In connection with the creation of the present invention, it constitutes a substantial point compared to the conventional method described above. It is possible to provide a vascular prosthesis made from a tubular component of a tissue-compatible material. It turned out to be possible. The vascular prosthesis according to the present invention has internal elasticity and quick recovery. A support structure is provided on at least one end of the component and extends outside the distal end of the component. It extends to the part. The present invention applies to permanent or long-term connections of arteries to all veins. If said end of the tubular component is connected to a vein and extends outwardly from the support construct Therefore, the purpose is to hold the veins in an inflated position from the inside so as not to obstruct blood circulation. Stretch into the vein.

The tubular component may be made from any tissue-compatible material of natural or synthetic nature. Ru. Thus, some of the components may include, for example, xenografts of bovine, ovine or porcine origin. Various types of traditional connection piece materials used in can be used. According to the present invention For example, the tubular component contains specially prepared chemically or physically xenografts. It is preferable to use such substances which are present in so-called xenoblafts. a polyethylene terephthalate, polytetrafluoroethylene, polyethylene terephthalate, polytetrafluoroethylene, Synthetic tissue compatible materials such as ethylene, polypropylene, etc. may be used.

However, according to the present invention, xenograft-type biological materials other than H) 9 are used. It is particularly preferable to do so.

The support structure disposed within the tubular component can be designed in many ways. The example is It consists of a spiral spring in the form of a helix that ensures a regulated pressure on the inner wall of the component.

The material for this spiral spring is a tissue-compatible material such as stainless steel or steel. Plastic materials with sufficient rigidity can be used. Regarding such a spiral spring, Further details are available from Swedish Patent Application No. 8202740-0. It is.

Alternatively, the centerline of the tubular body as a common axis of each of its supporting structures. Twisted helical arrangement - several individual rigid but flexible filamentous components that stretch A flexible tubular body composed of can be used. Many components have the same winding direction The insulators move axially with respect to each other. The above with the same winding direction The multiple components also move axially with respect to each other, but in opposite windings. It encounters and intersects with a number of oriented filamentous components. Such a tubular body can be expanded by shortening the tubular body axially or by shortening the tubular body axially. The diameter can be reduced by stretching.

The diameter of a vascular prosthesis varies over a relatively wide range depending on where it is applied. However, the most common size is about 3 to 10 throats. Exterior of tubular component The portion of the support structure that extends into the tubular component is suitably up to about 20 times the inner diameter of the tubular component. The length is 63 to 12 times the diameter to provide the desired function. this method As is known, blood pressure is lower due to the extensible ends of the supporting members. Particularly when the blood vessels consist of veins, which in some cases may even be negative with respect to atmospheric pressure, A satisfactory support function inside the blood vessel is obtained.

By using the vascular prosthesis according to the invention, the problems mentioned above can be easily and effectively solved. excluded by the method. Therefore, the Watashi prosthesis exhibits satisfactory elasticity during the entire insertion period. , and thus blood drainage can be carried out without problems. vortex in the opposite direction The additional features that are present when using spiral springs consisting of wound components or tubular constructions One advantage is that introducing a cannula into the prosthesis results in an expansion of the spring material, which in turn after removal of the cannula and return of the support structure to its normal position. The induced contraction of the opening of the prosthesis provides an almost automatic seal. It's true. Narrowing in relation to the application site of the vein thanks to the extending part of the supporting construct This will also avoid the risk of the formation of

The invention will be further described below by way of non-limiting example with reference to the accompanying drawings, in which: FIG. to the drawing This book applies to long-term continuous insertion to perform hemodialysis at regular intervals. A schematic diagram of a vascular prosthesis according to the invention is shown.

In the drawings, there is shown generally 1 according to the invention connected between an artery 5 and a vein 7. A vascular prosthesis is schematically shown. Bypass or vascular prosthesis 1 is a support structure This one contains a spiral spring 3 in a helical shape and is connected from the application site 9 of the artery. Through the tubular component 2 to the connection site 11 of the vein 7 and beyond it a distance 13 It has expanded to.

The tubular component 2 is preferably made of so-called kusetsu craft, for example of bovine origin, i.e. Comprised of xenografts that have been chemically and/or physically treated in an appropriate manner. It will be done.

The spiral spring filter is constructed from medically acceptable stainless steel.

The method of applying or inserting a vascular cord to connect the artery 5 to the vein 7 is simple, for example. If you write it down, it is as shown below.

As a first step, the patient's vein 7 is opened by a surgical incision and then the tubular component 2, e.g. For example, the kusetsu craft is attached to the vein by sewing in a conventional manner. Next The spiral spring 6 is inserted into the tubular component 1 from the outside. This is the spiral spring 6 retract by any suitable method, e.g. by rotating the ends with respect to each other; and then place the spiral spring 3 in the position shown in the drawing and apply a pressure suitable for its purpose. It is then inflated to fix it in this position. Silence The end extending towards the vein 7 extends a suitable distance 16 outside the tubular component 1. , which can be achieved with a length of 3 to 4 m when applied to hemodialysis.

After attaching the spiral spring 6 to the tubular component 1, the opposite end of the spring 50 is attached to the tubular configuration. Cut at the other end of the element. The patient's skin is then opened and the vascular prosthesis The object is inserted under the skin and attached to the opened artery 5 by suture. vascular prosthesis At this end of 1 no extended end of spiral spring 3 would be required, why? This is because there is overpressure in the artery.

After accessing the vascular prosthesis, the prosthesis is now easily localized and drains blood. - can be easily penetrated by

Further details regarding the structure of the vortex spring 6 and its application can be found in the aforementioned Swedish patent. See application no. 8202740-0.

Other devices may be mentioned among some useful support structures. to that invention In this case, the jacket surface of the tubular body consists of a number of individual filamentous components. These filamentous structures The components of a set of components are related to each other with the centerline of the tubular body as a common axis. and extended in a helical arrangement that is moved axially. The other set of components are Stretched in a helical arrangement in opposite winding directions, the filamentous components cross each other in opposite directions. It spreads out to form a cylindrical degenerate array.

The diameter of the tubular bodies assembled in this manner is axially the ends of the tubular bodies with respect to each other. υ can be varied in the direction of the center line by moving it to . The tubular body can be made in several ways. and the tubular body assumes the expanded position by itself in its released state. It is preferable to have the inherent ability to take This uses tension in the material of the tubular body It can be given by

The function of the support structure just described is otherwise the same as described in connection with the drawing. be.

It is acknowledged that the invention is not limited to the embodiments and applications described so far. Should be. Therefore, the device of the present invention can be used to collect blood for sample collection, analysis, dialysis, etc. Two blood vessels are interconnected by using a so-called bypass for the purpose of fluid drainage. Vine is used in all cases where it is desired to The size of the vascular prosthesis and 9 attachments are The law is not limited to what is described in h-1. Therefore, the tubular component It is well provided that the is previously provided with an internal support structure, such as a spiral spring, and and at least one end of a component of the support structure is outside the end of that element. It should be noted that the distance will be extended. Tubular provided earlier with supporting structure The component is then attached to the vein by sewing at the end where the supporting construct extends outward. The other end of the component is attached to the artery while the other end of the component is attached.

In addition to the advantages provided by the invention described above, the vascular prosthesis can be used for example in hemodialysis. As in the case of conventionally used vascular prostheses, which are placed subcutaneously in order to Another thing that would be better installed without rotating or folding You will get the benefits of The internal support structure gives the vascular prosthesis its elasticity and This makes the vascular prosthesis safe in operation and easy to use.

Claims (1)

[Claims] 1 At least one end (11) of the tubular component (2) with a distance 1@ (13) have an elastically quick recovery support structure that stretches by (3) the entire interior; a blood vessel (5, 7) consisting of a tubular component (2) of tissue-compatible material characterized by Vascular prosthesis, especially for use as a bypass between arteries and veins. 2 The component (2) is a so-called xenograft of bovine, sheep or porcine origin, especially a The vascular prosthesis according to claim 1, characterized in that it is made of a knob graft. B. Claim 1, wherein the component (2) is made of a synthetic material. The vascular prosthesis described. 4. A helix in which the support arrangement ensures a regulated pressure on the inner wall of component (2) Blood according to any claim characterized in that it consists of a spiral spring (3) in the shape Canal prosthesis. 5. The support structure is composed of several individual stiff but flexible filamentous components. consisting of tubular bodies, each of which has the centerline of the tubular body as a common axis Stretched in a helical arrangement, having the same winding direction but moving axially with respect to each other a number of components that also move axially with respect to each other but with opposite windings Claim No. The vascular prosthesis according to any one of items 1 to 3. 6. The above-mentioned distance (13) is about 20 times the diameter of the tubular component (2), in particular about 3 to Vascular prosthesis according to any claim characterized in that it has a length up to 12 times thing. Z. Connect the tubular component (2) at one end to the vein (7), then connect the tubular component ( 2) Insert a supporting structure (6) acting from the inside into the extend a certain distance inside it to support the vein (7) at one end, and then the tubular an artery (characterized in that the other end of the component (2) is connected to the artery (5)); 5) and the method of inserting a vascular prosthesis that acts as a binocular bridge between the veins (7). 8. The support structure (3) is attached before the tubular component (2) is attached to the vein (7). Claim 7, characterized in that it is introduced into a standing tubular component (2). A variation of the method.