JP2015073839A - Pad for surgery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical pad having excellent X-ray contrast properties, soft and excellent in handleability, having practical strength, and using an X-ray contrast thread suitably usable for medical application.SOLUTION: A pad for surgery is constituted of a pad, and a drawer yarn comprising an X-ray contrast thread attached to the pad. The pad for surgery is such that: the X-ray contrast thread is constituted of a multifilament yarn comprising a core-sheath type composite fiber; the core-sheath type composite fiber is arranged with polyamide resin containing exceeding 70 mass% and 80 or less mass% of barium sulphate in the core part, and polyamide resin having a relative viscosity of 3.0 or more in the sheath part; and based on the total mass of the core-sheath composite fiber, the content of barium sulphate is 45 or more mass%, and the ratio of the core part is 70-80 mass%.

Description

  The present invention relates to a surgical pad that can be confirmed by X-ray examination for the presence or absence of residue in the body.

  2. Description of the Related Art Conventionally, when performing a surgical operation or the like, a large number of gauze has been used to wipe or absorb bleeding, body fluid, etc. from a patient. After the surgery, all gauze must be removed from the patient's body. However, the gauze used during the operation is stained red by blood, and it may be difficult to distinguish it from the patient's organ at the patient's incision, and the gauze may be left in the patient's body. If gauze continues to remain in the body, the patient may not only feel pain in the body but also develop fever. Also, gauze can adhere to organs and cause other diseases.

  In order to prevent such an accident, an X-ray contrast yarn is woven as a fiber constituting a part of the gauze (Patent Document 1), or an X-ray contrast thread is attached to the gauze as a drawn yarn (Patent Document 2). Has been proposed. A specific proposal for an X-ray contrast yarn is, for example, Patent Document 3. In this technique, a yarn composed of an X-ray contrastable fiber in which barium sulfate is dispersed at a high concentration in a thermoplastic elastomer and a normal fiber is proposed. Ordinary fibers are used together to reinforce the strength of the X-ray contrast fibers, but the X-ray contrast fibers themselves are too hard and difficult to handle, so the yarn itself is also hard, It is difficult to say that the strength of a combination of ordinary fibers is very small and excellent in practicality.

JP 2006-51209 A JP 2002-325774 A JP 2008-110195 A

  The present invention solves the above problems, has good X-ray contrast properties, is soft and easy to handle, has practical strength, and can be suitably used in medical applications. It is a technical problem to provide a medical pad using a contrasting thread.

  As a result of intensive studies to solve the above problems, the present inventors have reached the present invention.

That is, the present invention is a surgical pad composed of a pad and a drawn-out thread made of an X-ray contrast thread attached to the pad,
The X-ray contrast yarn is constituted by a multifilament yarn constituted by a core-sheath type composite fiber,
The core-sheath type composite fiber has a polyamide resin containing 70% by mass or more and 80% by mass or less of barium sulfate in the core part, and a polyamide resin having a relative viscosity of 3.0 or more in the sheath part.
The content of barium sulfate is 45% by mass or more based on the total mass of the core-sheath composite fiber,
The gist of the surgical pad is characterized in that the ratio of the core is 70 to 80% by mass.

  Hereinafter, the present invention will be described in detail.

  In the present invention, the X-ray contrast yarn is composed of a core-sheath type composite fiber. Both the core part and the sheath part of the core-sheath type composite fiber are formed of polyamide resin. The reason for using the polyamide resin is that it is excellent in flexibility and strength. Examples of the polyamide resin include nylon 6, nylon 66, nylon 69, nylon 46, nylon 610, nylon 12, polymetaxylene adipamide, and copolymers of these components. In the present invention, nylon 6 is particularly preferably used. Nylon 6 has an excellent texture such as a soft feeling and a moist feeling due to polymer characteristics, and is therefore suitable for medical applications where the affected area is touched during surgery. In addition, the polyamide resin constituting the core portion and the sheath portion has various additives such as a matting agent, a modifier, an antistatic agent, a flame retardant, and a pigment as long as the effects of the present invention are not impaired. It may be added.

  The core part of the core-sheath type composite fiber in the present invention contains 70-80% by mass of barium sulfate. Barium sulfate is a contrast agent that exhibits X-ray contrast properties, and has high heat resistance and crystal stability. In the present invention, it is particularly preferable to use barium sulfate having a volume average particle diameter of 0.6 μm or less. Since such barium sulfate can easily produce particles having a small primary particle size and hardly agglomerate, a large amount of barium sulfate can be uniformly kneaded into the polyamide resin constituting the core portion. This barium sulfate is a polyamide resin kneaded in a large amount. When melt spinning using this, there is no increase in filtration pressure, yarn breakage, etc., and X-ray contrast fibers with good operability. Can be obtained. In the core-sheath type composite fiber, only the core part contains barium sulfate, and the sheath part does not contain barium sulfate. By containing barium sulfate, which is a radiopaque agent, only in the core part, troubles during spinning can be reduced and operability can be improved.

  In the core-sheath type composite fiber in the present invention, the barium sulfate content is 45% by mass or more with respect to the fiber mass. By setting the barium sulfate content to 45% by mass or more, the X-ray contrast property becomes extremely good.

  The relative viscosity of the polyamide resin disposed in the sheath portion of the core-sheath composite fiber is 3.0 or more. By setting the relative viscosity to be 3.0 or more, the periphery of the core containing a large amount of barium sulfate is satisfactorily covered, and the core is not partially exposed. Moreover, practical strength in the fiber can be maintained.

  The core / sheath ratio in the core / sheath composite fiber is core / sheath = 70-80 / 30-20 (mass%). By setting the ratio of the core part to 70% by mass or more, that is, by increasing the ratio of the core part containing a large amount of barium sulfate, it becomes possible to ensure a certain amount of barium sulfate content relative to the fiber mass. X-ray contrast properties are extremely good. In addition, by setting the ratio of the core part to 80% by mass or less, it is possible to maintain a form in which the periphery of the core part is completely covered with the sheath part and to obtain a good core-sheath type cross-sectional shape. There is no occurrence of yarn breakage due to clogging of the filter or increase in filtration pressure, and a fiber having good operability and practical strength can be obtained.

  The core-sheath type composite fiber in the present invention has the above-described configuration and has X-ray contrast properties. The X-ray contrast property is a property of blocking without transmitting X-rays when irradiated with X-rays, and means a characteristic of displaying an image when irradiated with X-rays. That is, the presence of the fiber of the present invention can be detected by irradiating X-rays. Accordingly, it is possible to identify the surgical pad by attaching it to the surgical pad and sensing the thread by X-ray fluoroscopy.

  The form of the core-sheath type composite fiber is not a short fiber having a predetermined fiber length but a continuous fiber. An X-ray contrast yarn is formed as a multifilament yarn formed by converging a plurality of continuous fibers.

  As for the form of the X-ray contrast yarn, a multifilament yarn having a twist itself may be used as the X-ray contrast yarn. The shape of the braid is preferable because it is easy to handle. Among these, the twisted yarn is easy to handle because it has good flexibility and flexibility, and can be used more preferably.

  The fineness of the X-ray contrast yarn is preferably 3000 dtex or more, more preferably 4000 dtex or more. If it is less than 3000 dtex, it is so thin that it is difficult to squeeze when it is attached to a medical pad and used as a drawn yarn. Moreover, by setting it to 3000 dtex or more, it becomes possible to confirm clearly when X-ray irradiation is performed. The upper limit of the fineness is about 10000 dtex from the viewpoint of flexibility and the like.

  When the fineness of the X-ray contrast yarn is 3000 dtex or more, the bending resistance is preferably flexibility of 140 mm or less. The bending resistance in the present invention is a value measured by a 45 ° cantilever method, and it can be said that the smaller the value, the better the flexibility. However, when the yarn fineness is decreased, the value of the bending resistance tends to decrease, but when the yarn diameter is decreased, the handleability tends to be inferior as described above. Therefore, in the present invention, a yarn having a fineness of 3000 dtex or more and having a specific flexibility is preferably used.

  The X-ray contrast yarn is attached to a medical pad as a drawn yarn. The attachment method is not limited as long as an appropriate method is adopted. For example, the method of attaching by sewing is mentioned. In addition, it is preferable that the tag string can be attached to a medical pad as the tag string is attached using a tag attachment device. Since the X-ray contrast yarn in the present invention is composed of the multifilament yarn formed by the specific core-sheath type composite fiber as described above, it has flexibility while maintaining an appropriate strength. It is preferable to use such a tag attachment device because the attachment operation is very easy and efficient.

  A known pad may be used as the medical pad. For example, absorbent cotton, non-woven fabric, gauze, and the like, and absorbent cotton coated with gauze or non-woven fabric are also included. Absorbent cotton, non-woven fabric or gauze may be used as a pad in a state in which a plurality of sheets are overlapped. For example, when an X-ray contrast yarn is attached using a tag attachment device in a state in which a plurality of sheets are overlapped, the X-ray contrast yarn preferably serves to bind a plurality of pads.

  According to the present invention, an X-ray contrast yarn composed of a multifilament yarn formed by the specific core-sheath composite fiber described above is attached to a medical pad as a drawn yarn, and the core-sheath composite Since the fiber has moderate strength and flexibility, the X-ray contrast yarn is easy to handle and functions well as a lead-out yarn for the pad.

  Next, the present invention will be specifically described with reference to examples. In addition, the measurement of the characteristic value in an Example was performed as follows.

(1) Relative viscosity of polyamide: Measured at a concentration of 1 g / dl and a temperature of 25 ° C. using 96% sulfuric acid as a solvent.
(2) High elongation of yarn: Measured according to JIS L 1013 using Shimadzu Autograph DSS-500 at a sample length of 25 cm and a tensile speed of 30 cm / min.
(3) Bending softness: Ten samples having a length of 15 cm were prepared and measured based on the 45 ° cantilever method (JIS L 1096). That is, the sample is placed on a horizontal platform of a cantilever type testing machine so that the longitudinal direction of the scale is parallel to the longitudinal direction of the sample (yarn) and the tip of the sample is aligned with the scale base line. A stainless steel plate was placed on the top so that the sample moved in parallel with the scale. The sample was gently extruded in the direction of the slope, and when the tip of the sample (yarn) was in contact with the slope, the position of the other end was read with a scale to determine the length (mm) moved. An average value of 10 points of the obtained values was defined as bending resistance.

Example 1
A nylon 6 resin having a relative viscosity of 3.51 containing 75% by mass of barium sulfate fine particles having a volume average particle diameter of 0.6 μm is used as a core, and a nylon 6 resin having a relative viscosity of 3.51 is used as a sheath. A core-sheath type compound spinneret was attached to the compound melt spinning apparatus, the core ratio was 70% by mass, and the polymer temperature was 280 ° C. for melt spinning. The spun core-sheath composite fiber was cooled, and after applying an oil agent, it was stretched without scraping at a speed of 400 m / min to obtain a 1670T / 96 drawn yarn (multifilament yarn). This multifilament yarn had a strength of 1.56 cN / dtex, an elongation of 24.8%, and a Young's modulus of 1315 N / mm ² .

Three obtained multifilament yarns were prepared to obtain a twisted yarn having a lower twist (S) of 420 T / M and an upper twist (Z) of 300 T / m, and this was used as an X-ray contrast yarn. This X-ray contrast yarn had a fineness of 5610 dtex, a strength of 1.28 cN / dtex, an elongation of 27.6%, a Young's modulus of 548 N / mm ² , and a bending resistance of 79 mm.

  This X-ray contrast yarn was cut into an appropriate length, set in a tag attachment device, attached to a plurality of superposed absorbent cottons, and used as a medical pad to which a drawn yarn was attached. The X-ray contrast yarn was excellent in flexibility and flexibility, had good handleability, and easily picked up the drawn yarn with tweezers.

Comparative Example 1
A commercially available X-ray contrast yarn was prepared as a comparative yarn. This yarn is a multifilament yarn obtained by twisting a plurality of single-phase fibers containing 70% by mass of barium sulfate in nylon 6 resin, and a multifilament made of polyethylene terephthalate is formed on the outer periphery of the twisted multifilament yarn. The yarn is a yarn wound and covered in a spiral shape to reinforce the strength (trade name: OPTACIA total fineness: 3892 dtex manufactured by Unitika). This yarn had a strength of 0.18 cN / dtex, an elongation of 45.3%, a Young's modulus of 697 N / mm ² , and a bending resistance of 162 mm. Since this yarn is inferior in flexibility and flexibility, when it is wound around a yarn tube, it has an arc shape. Moreover, since the strength was low, it was easily torn off with bare hands. Next, an attempt was made to cut it to an appropriate length and set it in a tag attachment device, but it was very inferior in handleability.

Comparative Example 2
In Example 1, an attempt was made to melt-spin in the same manner as in Example 1 except that the sheath polyamide resin having a relative viscosity of 2.51 was used. Could not get.

Claims (3)

A surgical pad composed of a pad and a drawn-out thread made of an X-ray contrast thread attached to the pad,
The X-ray contrast yarn is constituted by a multifilament yarn constituted by a core-sheath type composite fiber,
The core-sheath type composite fiber has a polyamide resin containing 70% by mass or more and 80% by mass or less of barium sulfate in the core part, and a polyamide resin having a relative viscosity of 3.0 or more in the sheath part.
The content of barium sulfate is 45% by mass or more based on the total mass of the core-sheath composite fiber,
A surgical pad, wherein the ratio of the core is 70 to 80% by mass. The surgical pad according to claim 1, wherein the X-ray contrast yarn is a twisted yarn obtained by twisting a plurality of multifilament yarns. The surgical pad according to claim 1 or 2, wherein the fineness of the X-ray contrast yarn is 3000 dtex or more and the bending resistance by the 45 ° cantilever method is 140 mm or less.