SU692923A1 - Method of making a multichannel knitted heart vessel prosthesis - Google Patents

Description

one

The invention relates to knitwear production and relates to techniques and production technologies for medical-related products, and more specifically to a method for manufacturing a blood vessel in a multi-channel prosthesis, a bifurcation.

There is a known method of manufacturing a multi-channel: a prosthesis of a venous vessel, and more specifically, a bifurcation, in which a tubular main trunk and branches are harvested with a filling machine on a two-base basis. The disadvantage of this method is that the resulting prosthesis has a branching diameter to main stem diameter of 0.5, which does not satisfy the requirements of hemodynamics C.

Theoretically, with arterial branches, for example, with a branching of the abdominal artery into the bony arteries, provided that the amount of fluid per unit of time is constant, the ratio of branch diameters to the main trunk should be 0.7. -Based-on technology, where a constant number of threads is used, is almost impossible to ensure the development of prostheses that meet

given condition (0.7). It is possible to change the diameters of the stem to obtain a predetermined ratio after using the forming methods. However, ZTR significantly lengthens the cycle of production and also, in addition, HapsmiaeT density of individual trunks in structure, which does not exclude the possibility of blood leakage.

There is also known a method of manufacturing a multi-channel prosthesis of a blood vessel, and more specifically a bifurcation, at the end of a superfloor pleyofangovuyu machine in the tubule of the main trunk and branching, while at the same time thinner branches are harvested, after which a wider trunk is harvested. Known; is carried out on a specialized machine with sectional shearings to the citizens.

 The design of the machine and the method carried out on it involve the main barrel on the number of needles,

twice the number of needles used in branching, which results in a prosthesis with a ratio of tight diameters equal to 0.5, which does not meet the requirements of hemodynamics 2. The closest in technical essence to the invention is a method of manufacturing a multi-channel prosthesis of a blood vessel in which a tubular main trunk and branchings are harvested in a double-sided plane machine, and the branches are pulled by separate thread guides into two separate vertical tubes, and and otyosheny di MeFrov equal to G, 7 th knitting is performed with deductions and increments the loop 3. The installation provides a prosthesis of a given shape. This method allows you to get a prosthesis that meets the requirements of hemodynamics. The drawbacks of the method are: the impossibility of obtaining prostheses with a number of branches, more than, gsjc, since the tubes of the axis of the neck are in the right direction; the impossibility of introducing an x-ray contrasting thread that would lie strictly along each of the branches, since the connection is carried out by continuous ring looped rows; the complexity of the process in the low as the implementation of consecutive depletions and increments of needles requires that the machine has special complicated mechanisms for the construction of both deductions and increments and software control. -: These disadvantages generally reduce the technological capabilities of the method and complicate it. The purpose of the invention is the simplification and expansion of technological possibilities, to her. This is achieved by branching the LENI. On the needles of the opposite needle machines in the form of single webs, both of which — the covered edges of which are located along the hinge row — are connected respectively by two connecting threads by successively laying the needles on both needles of the machine. , and the main trunk is connected to the h with one of the pairs of the open edges of single canvases; One of the variants is the way in which the main stem begins to get on it parts of the needles of the machine of the main stem, at the end of which the first link is being laid on the additionally included extreme needles of the machine, the number k from which is chosen branching, after that, on all the needles of the machine, two single canvases of a given length, at the end of which are occupied, the remaining open pair of woolen cloths are connected with a second connecting thread; - - --.:.--.-..-...-. In addition, a method is possible in which the opening of the branches is started by laying the first binding thread on all the needles of the machine, after that. at. Two single webs of a given length are pressed, at the end of the underside of which a second binding thread is laid, connecting a pair of open edges, and a main trunk is made of threads used in the formation of single webs. Pairs of open edges of single webs are looped into a loop with a kettle stitch. / To obtain the ability to control the position of the prosthesis in the body after surgery, the radiopaque fibers are used as binder yarns. To seal the tubes at the junction of the edges of the single webs. use of weft yarns; in addition, pngentape yarns are used as weft yarns. Thus, due to the expansion of the branches with the proposed technology, the process of obtaining a branch of a given diameter (almost any diameter) is simplified, since branching of the tree is stored in one piece (two folded single webs) using a single yarn feeder system. FIG. 1 shows a bifurcation prosthesis associated in a first embodiment of the method; on the fit.; 2 - the structure of FIG. one; the weave section in FIG. 3 shows the structure of the weave section b of FIG. one; in fig. 4 bifurcation prosthesis associated with the second variant of the method; in fig. 5, the structure of the weave of FIG. four; see b - the structure of the weave section b of fig. four; x in fig. 7,8 - multichannel prostheses with the number of branches more than two, constructive options. The method is carried out using the main trunk 1, branching 2, edges 3, 4 single webs, binding yarn 5, weft yarn 6, processing 7, extended section 8 of the main stem AND single web 9, Yu. The method is as follows. On a double-footed flat-fangled yashin of one of the needles, one also includes a working average section of needles, the number of which is chosen from the conditions for obtaining odHOBHoro stem 1 of a given diameter, and in a tubular tube single. nd; ya, yap, eymeir kulirnoy smooth. CTSol 1 in the direction of the arrow. The approach to the pre-determined Main Birla. And they turn off the middle needles on one needle bed without dropping the loops and add (turn on the work) ti Extreme needles on both sides, the number of which provides the specified length of branches. On the included extreme needles, the binding thread L is laid with an elastic net and

then on all needles there are two single canvases Y, ib. After a height of a specified number of looped rows, which is caused by the desired branching diameter i, the second binding thread is also laid with a elastic net (not shown in the drawing; further development is allowed). Opening the edge of p6loten 9, 10 can be joined in the loop and with the help of kettellar utea. The single webs y and o are closed from the side of the loop, a row and a tubular form of branching is formed.

The prosthesis can be inserted in the reverse order, namely, on all the needles first, the KOToptix quantity corresponds to the total length of two branches, after fitting the ayotus thread b with the elastic mesh, then two parallel uniform E1, Nkk Y, 1, and correspondingly : front and rear needles of the car.; -:. ; ::.,. l - -

Upon reaching a predetermined number of looped rows of single webs: the middle needles of one needle bed, on which the main stem 1 should fall, are switched off from work without dropping the loops, and the remaining needles are twisted in an elastic mesh, then turned off without loosing the loops, the middle needles and other needles and at the extreme needles in areas A produce viscous working, for example, with a curved satin, or the loops are fastened with a kettle stitch, at the end of the cycle in the entire prosthesis. After fixing the open edges of the single webs 9, Go, or rather after forming the tubular branches, the last loops in sections A are dropped from the needles and the latter are turned off from work. After that, start the vertical main trunk 1 in the direction of the arrow with tubular single knit.

This is the way in which fundamental technology is used in multi-anal prostheses.

Additional threads can be inserted into the edges to seal the junctions of the edges of single webs. For example, lay them in the form of a duck b. An X-ray contrast thread can be used as the Y EXTRA yarn b, as well as the binding thread b.

The proposed method allows to obtain prostheses in which the x-ray contrast fibers b and b are strictly oriented, and this allows, in turn, to control the position of the prosthesis in the body after surgery.

FIG. The prosthesis of three branches 2, located on opposite sides of the main trunk 1, is shown, and FIG. In branch 2, they are located on one side of the main trunk. Technologists in the occupancy of such Lrotezov are the same. The main trunk 1 (see Fig.7.8) also acts as a branch. Section 8 (see figure 4) can be made on a given conical contour by successive delays with the transfer of loops .; .

A similar region can be obtained in the prosthesis shown in FIG. 1, but at the expense of the needles increment.

After receiving the folded prosthesis from a flat-fang machine, it is molded and stabilized using known methods and devices.

In addition, the process of the subsequent crimping of the nipoTesa is given, since the T-shaped profile is preformed, since the refilling of the mandrel into the prosthetic channels is facilitated. Prosthesis

can be made with branching (LEE of different diameters.

25

Claims (3)

Invention Formula 1. A method of manufacturing a multi-channel prosthetic blood vessel in which, on a two-well the flat-stem mgyine in the harness of the main trunk and branching, about t and h and s and with the fact that, in order to simplify and expand its technological capabilities, the branching in the needles of the opposite needles of the machine in the form of two separate single canvases, both of which open pairs are located along the hinge row, are joined together by two connecting threads by sequential laying of the latter on the needles of both needles of the machine, and the main stem of the connections with one of the pairs of the red edges of the single webs. 2. Method according to clause 1, distinguishing with the fact that the main trunk begin to enter into the middle part: the needles of the machine of the MAIN trunk, at the end of the underhead of which the Screw is poured on the connecting thread to the additionally inserted extreme needles of the machine, the number of which is chosen from the condition of a given length of branches, After this, the needles on all the needles are ma-; two single canvases given The LENGTHS, at the end of which in the range of which the remaining open pair of canopies of cloths are joined by the second binder, tyu. ;, -,. - B The method according to claim 1, is different from the fact that the opening of the branches begins with the laying of the first binding wire on all the needles of the machine, then two single webs of a given length, after the end of at the bottom of which, the second binding thread is laid, connecting a pair of open edges, and the main stem of the threads used for stitching single sheets. 4. A method according to claim 1, characterized in that the pairs of open edges of the single webs connect the loop into the loop with a cattle rod. 5. Method POP.1, characterized in that radiopaque threads are used as binding threads. 6. Method POP.1, characterized in that the connection krsalok single webs are made with weft yarns. 7. The method according to claim 6, distinguished by the fact that radiopaque threads are used as weft threads. Sources of information taken into account in the examination 1. French patent No. 2064228, cl. A 61 F 1/00, 1971. 2. USSR author's certificate No. 141265, cl. D 04 B 1/22, 1960. 3.Wirkerei - und Strikerei Technik, 11, but Br, 1У75, Germany, p. 650661. Fig1 F1K Fig.} 1L  / ) Fi & b FIG.