JP2009039333A - Gauze containing x-ray imaging threads - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide gauze containing X-ray imaging threads from which the X-ray imaging threads do not easily fall off. <P>SOLUTION: When plainly weaving a gauze fabric 13 for which warp yarn 11 and weft yarn 12 comprising a cotton material are alternately crossed, the X-ray impermeable X-ray imaging threads 14 are woven in parallel with the warp yarn 11. At the time, by weaving auxiliary threads 15 comprising the cotton material, whose diameter is almost the same as that of the X-ray imaging threads 14 on both sides of the X-ray imaging threads 14, the firmness angle of the weft yarn 12 to the X-ray imaging threads 14 becomes large, the creeping distance of the weft yarn 12 in contact with the X-ray imaging threads 14 increases, the resistance of the weft yarn 12 increases, and the X-ray imaging threads 14 do not easily fall off. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gauze containing an X-ray contrast yarn used to absorb blood or body fluid, for example, during a surgical operation.

  Conventionally, in surgery, gauze has been used to absorb blood and body fluids, but this gauze may be forgotten to be recovered after being used due to the color of the absorbed blood.

  In order to prevent this, as shown in FIGS. 7 and 8, a gauze 2 containing an X-ray contrast yarn 1 woven with a synthetic resin such as polypropylene is used. Even if it is left behind, it can be detected by post-operative X-ray examination.

  In general, the X-ray contrast yarn 1 having no X-ray permeability uses a yarn that is considerably thicker than the diameters of the warp yarn 3 and the weft yarn 4 of the gauze 2 in order to detect it by post-operative X-ray examination.

  However, even if the above-mentioned X-ray contrast yarn 1 is woven together with the warp yarn 3 and the weft yarn 4 of the gauze 2, there is a problem that the slippery X-ray contrast yarn 1 made of synthetic resin is easily removed from the gauze 2.

  For example, when the large-diameter X-ray contrast yarn 1 is woven in parallel with the warp yarn 3, the tangent line connecting the outer diameters of the warp yarn 3 and the X-ray contrast yarn 1 from the warp yarn 3 to the X-ray contrast yarn 1, that is, the weft yarn 4 has a small inclination angle, and the distance at which the weft 4 contacts the X-ray contrast yarn 1, that is, the creepage distance is short. From FIG. 7 of this conventional example, the weft 4 slightly touches the circumference of the X-ray contrast yarn. For this reason, the resistance due to the frictional force of the weft 4 against the drawing of the X-ray contrast yarn 1 is small, and the drawing is easy.

  In order to solve this problem, in Patent Document 1, a plurality of gauze fabric warp yarns adjacent to an X-ray contrast yarn are closely arranged parallel to the X-ray contrast yarn to reinforce the weft yarn, The tightness of the contrast yarn by the weft is strengthened to make it difficult to remove.

  Further, in Patent Document 2, an auxiliary yarn having substantially the same diameter as that of the X-ray contrast yarn is plainly woven in close contact with the X-ray contrast yarn on one side of the X-ray contrast yarn, thereby increasing the frictional resistance against the X-ray contrast yarn. Thus, it is difficult to remove the X-ray contrast yarn.

JP 2007-20733 A Utility Model Registration No. 3130538

  However, in any gauze containing X-ray contrast yarns in Patent Documents 1 and 2, it is necessary to closely weave one or several yarns adjacent to the X-ray contrast yarn, and the pitch of the yarn in the vicinity of the X-ray contrast yarn Therefore, there is a problem that a special loom is required to change the manufacturing process, the manufacturing process becomes complicated, and the manufacturing cost increases.

  An object of the present invention is to solve the above-described problems, and to provide an x-ray contrast yarn-containing gauze that can be manufactured by a general-purpose loom and is difficult to remove the X-ray contrast yarn.

  In order to achieve the above object, the technical feature of the gauze containing X-ray contrast yarn according to the present invention is that a gauze in which a large number of gauze yarns are cross-machined in a plane and crosswise and plain woven has a larger diameter than the gauze yarn in the longitudinal direction. A line contrast yarn is woven, and an auxiliary yarn having a diameter larger than that of the gauze yarn is arranged on both sides of the X-ray contrast yarn.

  According to the gauze containing the X-ray contrast yarn according to the present invention, the auxiliary yarn is arranged at intervals on both sides of the X-ray contrast yarn, and the auxiliary yarn is thicker than the gauze yarn, thereby crossing the X-ray contrast yarn. By increasing the contact creepage distance with the gauze yarn to be increased, the frictional resistance can be increased, and the X-ray contrast yarn can be made difficult to escape from the gauze.

  The present invention will be described in detail based on the illustrated embodiment.

  FIG. 1 is a partially enlarged view of a gauze containing an X-ray contrast yarn as viewed from the front, and FIG. 2 is a cross-sectional view. The pitch of the yarn is the same as that in FIGS. For example, warp yarns 11 and weft yarns 12 made of cotton material having a thickness of 40 (thickness of about 30720 m per about 454 g) are alternately crossed, gauze fabric 13 having a width of about 30 cm is plain woven, and a length of 30 cm It is cut and used to the extent.

  In this gauze fabric 13, for example, X-ray contrast yarns 14 having no X-ray permeability are woven in parallel with the warp yarn 11 at a position of 10 to 20% from the end, and X-ray contrast yarns are further provided on both sides thereof. 14, a thick auxiliary thread 15 is woven at an interval. This auxiliary thread 15 is made by twisting, for example, three 20th yarns (yarns having a thickness of about 15360 m per about 454 g), and is made to have the same diameter as the X-ray contrast yarn 14. preferable. In addition, although the auxiliary | assistant yarn 15 used what twisted three yarns in the present Example, you may twist 3 or more yarns, and you may use the yarn which is not twisted.

  In this way, by interweaving the auxiliary yarns 15 having substantially the same diameter as the X-ray contrast yarn 14 one by one on both sides of the X-ray contrast yarn 14, the height difference of the stretched weft yarns 12 becomes large, and the X-ray contrast is increased. The contact creeping distance of the weft yarn 12 that contacts the yarn 14 increases, and the weft yarn 12 contacts the circumference of the X-ray contrast yarn 14 at a longer distance than the conventional example. The auxiliary yarn 15 is made of the same material as the warp yarn 11 and the weft yarn 12 and has low slip resistance. The weft yarn 12 gives a frictional resistance to the X-ray contrast yarn 14, and the X-ray contrast yarn 14 is less likely to come out compared to the conventional example. .

  Further, the thickness of the auxiliary thread 15 may not be substantially the same as that of the X-ray contrast thread 14. If the diameter of the auxiliary thread 15 is larger than that of the warp thread 11, the X-ray contrast thread 14 is simply placed in the gauze fabric as in the conventional example. It is more effective than weaving.

  This effect will be described using a specific numerical example with reference to FIG. It is assumed that adjacent yarns S having a radius r are arranged at intervals of a pitch P parallel to the longitudinal direction with respect to the X-ray contrast yarns 14 having a radius R, and weft yarns 12 having a diameter d are woven into them. Here, if the proximity yarn S is the auxiliary yarn 15, it is the same as the embodiment shown in FIGS. 1 and 2, and if the proximity yarn S is the warp yarn 11, it is the same as the conventional example shown in FIGS. 7 and 8.

  The weft yarn 12 is stretched in the tangential direction with respect to the X-ray contrast yarn 14 and the adjacent yarn S. For the sake of easy calculation, considering the line segment A inside the weft yarn 12 in contact with the X-ray contrast yarn 14 as a reference, the adjacent yarn S moves to the left as indicated by the dotted line by the diameter d of the weft yarn 12. The proximity yarn S ′ is approximated so as to contact the line segment A of the weft yarn 12.

  Here, a line segment connecting the center point of the X-ray contrast thread 14 and the center point of the adjacent thread S ′ is B, and the intersection of the line segment A and the line segment B is C. In addition, the angle formed by the line segment connecting the contact point between the X-ray contrast thread 14 and the adjacent thread S ′ in the line segment A and the center point of each thread 14, S ′ with respect to the line segment B is the same. Let α be.

The distance between the center point of the X-ray contrast yarn 14 and the intersection C is (P−d) R / (R + r). Then, the following expression (1) is established.
{(P−d) R / (R + r)} cos α = R
∴ cos α = (R + r) / (P−d) (1)

Now, if the proximity yarn S is the auxiliary yarn 15 of the first embodiment and has the same diameter as the X-ray contrast yarn 14, r = R, so that the equation (1) becomes the following equation (2).
cos α = 2R / (P−d) (2)

Further, when the adjacent yarn S is the warp yarn 11 and has the same diameter as the weft yarn 12, d = 2r, and therefore the equation (1) becomes the following equation (3).
cos α = (R + d / 2) / (P−d) (3)

  Specifically, for example, if P = 3R and d = R / 2, then in equation (2), cos α = 2R / (3R−R / 2) = 2 / 2.5 = 0.8, and α = It will be 36.9 degrees.

  On the other hand, if the adjacent yarn S is the warp yarn 11 as in the conventional example and P = 3R and d = R / 2, the equation (3) is expressed as cos α = (R + R / 4) / (3R−R / 2). ) = 1.25 / 2.5 = 0.5, and α = 60 degrees.

  Since the adjacent yarn S is also on the left side of the X-ray contrast yarn 14, the angle θ at which the weft 12 contacts the X-ray contrast yarn 14 is θ = (180−2α). In the first embodiment, θ = 106.2. In the conventional example, θ = 60 degrees.

  Thus, in Example 1, the weft 12 extends over 106.2 degrees, that is, contacts with the X-ray contrast yarn 14 at a creepage distance of about 30% with respect to the circumference. On the other hand, in the conventional example, contact is made at a creepage distance of 60 degrees, that is, about 17% of the circumference, and the frictional resistance by the weft 12 is 106.2 / 60 = 1.77 in the first example than in the conventional example. The X-ray contrast yarn 14 is less likely to come off.

  Note that (1) in Table 1 indicates an angle θ calculated for a possible size of P and d with respect to the radius R of the X-ray contrast yarn 14. However, (2) is a numerical example already described.

P d Example angle θ θ Conventional example angle θ
(1) 3R 2R / 3 116.4 69.5
(2) 3R R / 2 106.2 60.0
(3) 3R R / 3 97.2 50.9
(4) 4R 2R / 3 73.8 47.2
(5) 4R R / 2 69.5 42.2
(6) 4R R / 3 66.8 36.2

  In any case, the angle θ of the embodiment is 1.5 times or more larger than the angle θ of the conventional example, and the creepage distance is 1.5 times or more. The frictional resistance against the contrast yarn 14 is also 1.5 times or more.

  In the first embodiment, the auxiliary yarns 15 are arranged on both sides of one X-ray contrast yarn 14. However, in the second embodiment, two X-ray contrast yarns 14 are arranged as shown in FIGS. 4 and 5. The gauze fabric 13 'is manufactured by arranging the auxiliary yarns 15 on both sides of the two X-ray contrast yarns 14, respectively.

  If the two X-ray contrast yarns 14 are arranged in this way and the auxiliary yarns 15 having the same diameter are arranged on both sides of the X-ray contrast yarns 14, the weft yarn 12 is implemented for each X-ray contrast yarn 14. Since it works like Example 1, it becomes difficult to remove the X-ray contrast yarn 14.

  Further, by using the two X-ray contrast threads 14, the X-ray contrast threads 14 can be recognized more clearly in the post-operative X-ray examination. Even in this case, the X-ray contrast yarn 14 is difficult to come off as in the first embodiment.

  In the second embodiment, two X-ray contrast threads 14 are used, but the present invention can naturally be applied to three or more X-ray contrast threads 14.

  FIG. 6 shows a partially enlarged view of the gauze containing an X-ray contrast yarn in the third embodiment as viewed from the front, in which two X-ray contrast yarns 14 and three auxiliary yarns 15 are alternately arranged. The gauze dough 13 ″ is manufactured by the above.

It is the elements on larger scale of the gauze containing the X-ray contrast yarn of Example 1. FIG. It is a fragmentary sectional view of a gauze containing X-ray contrast yarn. It is explanatory drawing which calculates | requires the angle which a weft contacts with an X-ray contrast thread. It is the elements on larger scale of the gauze containing the X-ray contrast yarn of Example 2. FIG. It is a fragmentary sectional view of a gauze containing X-ray contrast yarn. It is the elements on larger scale of the gauze containing the X-ray contrast yarn of Example 3. It is the elements on larger scale of the gauze containing the X-ray contrast yarn of a prior art example. It is a fragmentary sectional view of the gauze containing an X-ray contrast thread of the conventional example.

Explanation of symbols

11 Warp yarn 12 Weft yarn 13, 13 ', 13 "Gauze fabric 14 X-ray contrast yarn 15 Auxiliary yarn

Claims (3)

  In a gauze in which a large number of gauze yarns are cross-woven in the horizontal and vertical planes, an X-ray contrast yarn having a larger diameter than that of the gauze yarn is woven in the longitudinal direction, and the gauze yarn is spaced apart on both sides of the X-ray contrast yarn. A gauze containing an X-ray contrast yarn, in which a large-diameter auxiliary yarn is arranged.   The x-ray contrast yarn-containing gauze according to claim 1, wherein the X-ray contrast yarn has the same diameter as the auxiliary yarn.   The gauze containing an X-ray contrast yarn according to claim 1 or 2, wherein a plurality of the X-ray contrast yarns are woven in parallel with the auxiliary yarn.

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