Resin compositions, cables, tubes, and medical diagnostic devices

Abstract

To provide a resin composition reversibly changing its color by irradiation and shielding of UV-C light which can effectively obtain a function by an additive including a UV-C light shielding function, a cable or a tube using the resin composition as a marker for visualizing the execution status of sterilization treatment by past UV-C light, and a medical diagnostic apparatus including the cable or tube.SOLUTION: A resin composition 1 has a base material 10 composed of a resin, a first additive 11 which reversibly changes its color by irradiation and shielding of UV-C light and is composed of a tungsten oxide, and a second additive 12 capable of shielding the UV-C light.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to resin compositions, cables, tubes, and medical diagnostic devices. [Background technology]

[0002] Conventionally, indicators for showing the status of sterilization treatment of articles that change color upon irradiation with UV-C light are known (see Patent Document 1). The indicator described in Patent Document 1 uses organic substances that change color upon irradiation with UV-C light, such as photochromic monomers, photochromic oligomers, and photochromic polymers.

[0003] According to the indicator described in Patent Document 1, the change in color allows for visual recognition that the article to which the indicator is connected has been sterilized by irradiation with UV-C light. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Special Publication No. 2017-524393 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, the indicator described in Patent Document 1 uses organic matter as the substance that changes color upon irradiation with UV-C light, and therefore cannot be used in combination with a substance that has the function of decomposing organic matter. For example, when using additives as UV-C light shielding materials or pigments, it is not possible to use substances with photocatalytic function such as titanium dioxide (TiO2), and the range of material selection is narrow, making it difficult to effectively obtain the function of the additive.

[0006] The object of the present invention is to provide a resin composition that reversibly changes color upon irradiation with UV-C light and shielding, and that can effectively obtain the function of an additive including a UV-C light shielding function; a cable or tube using the above resin composition as a marker for visualizing the status of past UV-C light sterilization treatments; and a medical diagnostic device equipped with the above cable or tube. [Means for solving the problem]

[0007] The present invention aims to solve the above problems by providing a resin composition comprising a base material made of resin, a first additive made of tungsten oxide that reversibly changes color upon irradiation with UV-C light and light shielding, and a second additive that can shield against UV-C light.

[0008] Furthermore, the present invention aims to solve the above problems by providing a cable or tube having a marker on its surface for visualizing the status of past UV-C light sterilization treatments, wherein the marker is made of the above-mentioned resin composition.

[0009] Furthermore, the present invention aims to solve the above problems by providing a medical diagnostic device equipped with the above-mentioned cable or tube. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a resin composition that reversibly changes color upon irradiation and shielding with UV-C light, and that can effectively obtain the function of an additive including a UV-C light shielding function, a cable or tube using the above resin composition as a marker for visualizing the status of past UV-C light sterilization treatments, and a medical diagnostic device equipped with the above cable or tube. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a vertical cross-sectional view of a resin composition according to the first embodiment of the present invention. [Figure 2] Figure 2 is a schematic diagram showing the discoloration process when tungsten oxide has a composition of WOx (2.9 < x ≤ 3). [Figure 3] FIG. 3(a) is a plan view schematically showing the configuration of an ultrasonic probe cable according to a second embodiment of the present invention. FIG. 3(b) is a cross-sectional view in the radial direction of the ultrasonic probe cable cut along the cutting line A-A shown in FIG. 3(a). [Figure 4] FIGS. 4(a) and (b) are a side view and a top view schematically showing the configuration of a marker forming device for forming a marker on a cable.

Mode for Carrying Out the Invention

[0012] 〔First Embodiment〕 (Configuration of Resin Composition) FIG. 1 is a vertical cross-sectional view of a resin composition 1 according to a first embodiment of the present invention. The resin composition 1 includes a base material 10 made of resin, a first additive 11 made of tungsten oxide that reversibly changes color by irradiation with UV-C light and shielding of light, and a second additive 12 that can shield UV-C light. Here, UV-C light is ultraviolet light in a wavelength range of 200 to 280 nm.

[0013] The base material 10 includes, for example, at least one or more of high-density polyethylene, low-density polyethylene, fluororesin, polyvinyl chloride, synthetic rubber, silicone resin, chloroprene rubber, and polyurethane. In particular, a silicone resin having excellent resistance to ultraviolet light is preferable as the material of the base material 10.

[0014] The first additive 11 contained in the resin composition 1 is fine particles of tungsten oxide. Tungsten oxide has the property of changing color depending on its composition ratio. For example, WO3 is yellow, WO

[0014] , , ,

[0013] , 2.9 , , 2.7 is blue, WO 2.7It is known to have a purple color with and a brown color with WO2. Also, by irradiating tungsten oxide with UV-C light, a reduction reaction can be caused to reduce the oxygen composition ratio. Conversely, by blocking the UV-C light irradiated on tungsten oxide, an oxidation reaction can be caused to increase the oxygen composition ratio. That is, by irradiating and blocking UV-C light, the color of tungsten oxide can be reversibly changed.

[0015] Figure 2 shows tungsten oxide as WO x (2.9 < x ≤ 3). It is a schematic diagram showing the discoloration process. To effectively discolor the first additive 11 by irradiating with UV-C light, the first additive 11 preferably has a color closer to yellow than yellow or blue and is WO x (2.9 < x ≤ 3). In this case, by irradiating the resin composition 1 with UV-C light, a reduction reaction occurs in the first additive 11 and it changes color to blue or the like. Then, by placing the resin composition 1 in an environment not irradiated with UV-C light, an oxidation reaction occurs in the first additive 11 and it changes color to yellow.

[0016] The concentration of the first additive 11 contained in the resin composition 1 is preferably 10% by mass or more. When the concentration of the first additive 11 is 10% by mass or more, effective photocatalytic activity can be effectively exerted.

[0017] The second additive 12 contained in the resin composition 1 can shield UV-C light by absorption and / or scattering. By the second additive 12 shielding UV-C light, deterioration of members covered by the base material 10 or members composed of the resin composition 1 due to UV-C light can be suppressed.

[0018] The second additive 12 contains, for example, at least one or more of fine particles of aluminum oxide, cerium oxide, zinc oxide, indium oxide, zirconium oxide, tin oxide, manganese oxide, iron oxide, silicon oxide, and titanium oxide (TiO2). Further, as the second additive 12, an organic substance such as a benzoate-based organic substance (specific example: 2,4-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate) may be used.

[0019] In particular, the second additive 12 preferably contains fine particles of titanium oxide. Titanium oxide can promote the oxidation-reduction reaction of the first additive 11 due to its catalytic action and increase the amount of color change when irradiated with UV-C light. That is, by including fine particles of titanium oxide in the second additive 12, it becomes easier to visually recognize that the resin composition 1 has been irradiated with UV-C light. Further, due to the bactericidal effect by the catalytic action of titanium oxide, sterilization of the resin composition 1 can be more effectively carried out in combination with the sterilization treatment by irradiation with UV-C light. FIG. 2 is a schematic diagram when the second additive 12 contains fine particles of titanium oxide.

[0020] Even when the second additive 12 contains titanium oxide, since the first additive 11, tungsten oxide, is an inorganic material, there is no possibility that the first additive 11 will be decomposed by the catalytic action of titanium oxide.

[0021] The titanium oxide used for the second additive 12 may be any of anatase type, rutile type, or brookite type. Further, niobium oxide may be added to titanium oxide to impart stability.

[0022] Titanium dioxide with different crystal structures has different absorption wavelengths; therefore, by including multiple types of titanium dioxide as additives, resistance to ultraviolet light over a wider wavelength range can be achieved. Specifically, when the second additive 12 contains titanium dioxide, it is preferable to include two or more of the rutile, anatase, and brookite types. Anatase titanium dioxide has a higher absorbance of ultraviolet light in the UV-C region (200-280 nm) than rutile titanium dioxide. On the other hand, rutile titanium dioxide can absorb longer wavelength ultraviolet light than anatase titanium dioxide (rutile titanium dioxide can absorb ultraviolet light below approximately 400 nm, while anatase titanium dioxide can absorb ultraviolet light below approximately 370 nm).

[0023] Furthermore, mixing rutile-type titanium dioxide and anatase-type titanium dioxide in a ratio of 70:30 to 90:10 enhances catalytic activity, further promoting the oxidation-reduction reaction of the first additive 11 and improving its bactericidal effect.

[0024] When titanium dioxide fine particles are used as the second additive 12, the concentration of the second additive 12 in the resin composition 1 is preferably 3% by mass or more. When the concentration of the second additive 12 is 3% by mass or more, the ultraviolet resistance of the entire resin composition 1 can be improved. Furthermore, when titanium dioxide fine particles are used as the second additive 12, the higher the concentration of the second additive 12 in the resin composition 1, the more strongly the oxidation-reduction reaction of the first additive 11 is promoted, and the greater the amount of color change when irradiated with UV-C light can be.

[0025] Furthermore, it is preferable that the resin composition 1 contains a catalyst with high catalytic activity as a third additive. For example, the amount of ethylene hydrogenation reaction (number of molecules / cm³) on the surface of the third additive. 2 ·s) is 10 times the amount of ethylene hydrogenation reaction on the surface of Rh (rhodium). -3It is preferable that the ratio is more than double. When the resin composition 1 contains a third additive, the oxidation-reduction reaction of the first additive 11 is promoted, and the amount of color change when irradiated with UV-C light can be increased. In addition, due to the sterilizing effect of the catalytic action of the third additive, sterilization of the resin composition 1 can be carried out more effectively in combination with sterilization treatment by irradiation with UV-C light. The third additive includes, for example, at least one of palladium, platinum, and silver fine particles.

[0026] Furthermore, even if the resin composition 1 contains a third additive, since the first additive 11, tungsten oxide, is an inorganic material, there is no risk of the first additive 11 being decomposed by the catalytic action of the third additive.

[0027] Resin composition 1 can be used as a material for a marker to visualize the status of past sterilization treatments, which is applied to the surface of medical cables, tubes, and other articles that undergo sterilization treatment by irradiation with UV-C light. In other words, according to the present invention, it is possible to provide a marker made of resin composition 1 for visualizing the status of past sterilization treatments, and an article equipped with such a marker. In this case, the color of the marker changes when irradiated with UV-C light, and the color returns to normal after a certain period of time has elapsed since the irradiation of UV-C light was stopped. For example, if the marker is blue, it can be determined that the article equipped with the marker has been sterilized, and if the marker is yellow, it can be determined that the sterilization treatment has not been performed or that a predetermined amount of time has elapsed since the sterilization treatment and the sterilization effect has diminished.

[0028] Furthermore, the first additive 11 undergoes a reduction reaction and changes color not only when irradiated with UV-C light, but also when exposed to hydrogen gas. After a certain period of time has elapsed since exposure to hydrogen gas was stopped, the color returns to its original state due to an oxidation reaction. For this reason, the resin composition 1 can also be used as a marker for detecting hydrogen leaks. In other words, according to the present invention, it is possible to provide a hydrogen leak detection marker made of the resin composition 1, and an apparatus equipped with the marker.

[0029] [Second Embodiment] A second embodiment of the present invention is a cable or tube that uses the resin composition 1 according to the first embodiment as a marker material for visualizing the status of past sterilization treatments. As an example, a medical ultrasonic probe cable will be described below.

[0030] Figure 3(a) is a schematic plan view showing the configuration of an ultrasonic probe cable 2 according to a second embodiment of the present invention. In the ultrasonic probe cable 2, as shown in Figure 3(a), an ultrasonic probe 32 is attached to one end of the cable 20 via a boot 31 that protects this end. On the other hand, a connector 33 for connecting the ultrasonic probe cable 2 to the main body of an ultrasonic imaging device is attached to the other end of the cable 20.

[0031] Figure 3(b) is a radial cross-sectional view of the ultrasonic probe cable 2 cut along the cutting line AA shown in Figure 3(a). Inside the cable 20, for example, multiple coaxial cables or similar wires 21 are housed, and a shield 22, such as a braided shield, is provided to cover these multiple wires 21. A sheath 23 is provided to cover the shield 22. Furthermore, in the cable 20, a coating 24 is formed that covers the periphery of the sheath 23 and is in close contact with the sheath 23.

[0032] The sheath 23 and coating 24 of the cable 20 have, for example, a base material made of resin and a second additive 12 that can shield against UV-C light. In this case, because the sheath 23 and coating 24 contain the second additive 12, the cable 20 has excellent resistance to UV-C light. Furthermore, if the coating 24 contains fine particles to give the surface of the coating 24 an uneven surface, such as silicone resin fine particles, silicone rubber fine particles, or silica fine particles, the cable 20 has excellent surface slipperiness and can suppress snagging caused by surface stickiness. The base material of the sheath 23 and coating 24 can be the same material as the base material 10 of the resin composition 1. For example, it is preferable to use silicone rubber for the material of the sheath 23 and an addition-reaction type silicone rubber coating agent containing silicone resin fine particles and titanium dioxide for the material of the coating 24. Note that if polyvinyl chloride (PVC) is used for the material of the sheath 23, the surface will not be sticky, so a coating 24 may not be necessary.

[0033] The boot 31 is attached to the sheath 24 of the cable 20, covering the sheath 24 via an adhesive layer 34. The boot 31 is made of a resin such as PVC, silicone resin, or chloroprene rubber, and preferably contains a second additive 12 for shielding UV-C light, similar to the sheath 23 and the sheath 24. The adhesive layer 34 is formed from, for example, a silicone adhesive or an epoxy adhesive. In particular, it is preferable to use a condensation reaction type silicone adhesive for the adhesive layer 34.

[0034] The ultrasonic probe cable 2 has a marker on its surface to visualize the status of past UV-C light sterilization treatments. Since this marker is made of resin composition 1, it changes color when the ultrasonic probe cable 2 is subjected to UV-C light sterilization treatment, and returns to its original color after a certain period of time has elapsed since the UV-C light irradiation was stopped. For example, when the color of the marker has changed from its initial state, for example, when it has changed from yellow to blue, it can be determined that the ultrasonic probe cable 2 has been sterilized, and when the color of the marker has returned to its initial state, it can be determined that sterilization treatment has not been performed or that a predetermined time has elapsed since the sterilization treatment and the sterilization effect has diminished.

[0035] The position, size, shape, and number of markers on the ultrasonic probe cable 2 are not particularly limited. In the example shown in Figure 3(a), the ultrasonic probe cable 2 includes a marker 201 provided on a part of the surface of the cable 20 and a marker 321 provided on a part of the housing of the ultrasonic probe 32. In this case, for example, the markers 201 and 321 are formed by coating a part of the surface of the cable 20 or ultrasonic probe 32 with the resin composition 1 in a predetermined shape. Alternatively, for example, the boot 31 may be made of the resin composition 1 and the entire boot 31 may be used as a marker.

[0036] In markers such as marker 201 and marker 321, it is preferable that a portion of the first additive 11 is exposed on the surface of the marker, that is, not completely covered by the base material 10. In this case, the first additive 11 can efficiently absorb UV-C light, resulting in a larger color change. Furthermore, if a portion of the catalytic second additive 12 or third additive is exposed on the surface of the marker, the second additive 12 and third additive can efficiently absorb UV-C light, thereby strengthening the catalytic effect, increasing the color change of the first additive 11, and enhancing the bactericidal effect.

[0037] Figures 4(a) and 4(b) are schematic side and top views showing the configuration of a marker forming apparatus 50 for forming markers 201 on a cable 20. The sheath 23 of the cable 20 is made of silicone rubber, and the coating 24 is made of an addition-reaction type silicone rubber coating agent containing silicone resin fine particles and titanium dioxide. The case in which a portion of the coating 24 becomes the marker 201 will be explained. The marker forming apparatus 50 forms the marker 201 by, for example, spraying a compound additive containing a first additive 11 and a second additive 12 onto the surface of the cable 20 to which the coating liquid, which is the material of the coating 24, has been applied. When forming a marker 201 that includes a third additive, the third additive is included in the compound additive in addition to the first additive 11 and the second additive 12.

[0038] The coating liquid applied to the surface of the cable 20 is a resin, which is the material of the base material 10, liquefied by a solvent. After the compounding additives are sprayed on, the solvent evaporates and hardens, forming the base material 10. The resin that is the base material of the coating 24 may also be used as the base material 10 of the resin composition 1 that constitutes the marker 201. The resin that is the base material of the coating 24 and the base material 10 of the resin composition 1 that constitutes the marker 201 may be different materials, or they may be the same material, with the first layer (inner circumference layer) being the coating 24 and the second layer (outer circumference layer) being the marker 201. The surface of the cable 20 on which the marker 201 is formed is the surface of the coating 24 if the cable 20 has a coating 24, and the surface of the sheath 23 if the cable 20 does not have a coating 24. The following describes the case in which the resin that is the base material of the coating 24 is also used as the base material 10 of the resin composition 1 that constitutes the marker 201.

[0039] The marker forming apparatus 50 includes an introduction reel 51 for introducing the cable 20 into the marker forming apparatus 50, a delivery reel 52 for sending the cable 20 introduced by the introduction reel 51 to the marker forming area, a take-up reel 53 for taking up the cable 20 that has passed through the marker forming area, a winding coil 54 for winding up the cable 20 taken up by the take-up reel 53, a delivery guide jig 55 installed between the introduction reel 51 and the delivery reel 52 for guiding the progress of the cable 20, and an installation between the take-up reel 53 and the winding coil 54. The system includes a take-up guide jig 56 for guiding the progress of the cable 20, a support section 57 for supporting the delivery reel 52, the take-up reel 53, etc., a coating liquid spraying device 60 for spraying the coating liquid onto the surface of the cable 20 in front of the marker formation area between the delivery reel 52 and the take-up reel 53, an additive spraying device 58 for spraying the above-mentioned additive onto the surface of the cable 20 in the marker formation area, and a heater 61 for heating and curing the coating liquid in the back of the marker formation area between the delivery reel 52 and the take-up reel 53. In Figures 4(a) and (b), the direction of transport of the cable 20 is from left to right. If the coating liquid sprayed from the coating liquid spraying device 60 contains a second additive, the additive sprayed from the additive spraying device 58 may contain only the first additive or may contain the second additive.

[0040] Figures 4(a) and 4(b) schematically show only the nozzle portion of the additive spraying device 58. The additive sprayed from the nozzle portion of the additive spraying device 58 passes through the shutter 59 and is sprayed onto the surface of the cable 20. Here, when the shutter 59 is closed, the additive cannot pass through the shutter 59, and can only pass through the shutter 59 when it is open. Therefore, by intermittently opening and closing the shutter 59 at a constant cycle, markers 201 can be formed at regular intervals on the surface of the cable 20 being transported inside the marker forming device 50. After the markers 201 are formed on the cable 20, it is wound onto the winding coil 54 and then cut to a length suitable for the ultrasonic probe cable 2.

[0041] When forming the marker 201 by spraying the compounding additive using the compounding additive spraying device 58, it is easy to obtain a marker 201 in which a portion of the first additive 11 and the second additive 12 are exposed on the surface of the base material 10.

[0042] The cable or tube according to this embodiment is not limited to the ultrasonic probe cable 2 described above, as long as it is equipped with a marker made of resin composition 1. For example, it may be an endoscope scope equipped with a camera at the tip of the cable, or a tube (hollow tube) used for medical purposes, such as a catheter, a tube set for endoscopic surgical instruments, a tube set for ultrasonic surgical instruments, a tube for a blood analyzer, piping inside an oxygen concentrator, a hemodialysis blood circuit, a cardiopulmonary bypass circuit, an endotracheal tube, etc. In these cables or tubes as well, the status of past sterilization treatments can be visually recognized by the change in the color of the marker, similar to the ultrasonic probe cable 2.

[0043] An ultrasonic probe cable 2, which is one form of cable or tube according to this embodiment, is used in an ultrasonic imaging diagnostic device. Furthermore, an endoscope scope, which is another form of cable or tube according to the present invention, is used in an endoscopic system. Also, a medical tube, which is another form of cable or tube according to the present invention, is used in hemodialysis machines, cardiopulmonary bypass machines, blood analyzers, and the like. Therefore, according to the present invention, it is possible to provide a medical diagnostic device equipped with cables or tubes such as an ultrasonic probe cable 2, an endoscope scope, and a medical tube.

[0044] (Effects of the embodiment) According to the above first embodiment, a resin composition that reversibly changes color by irradiation and shielding of UV-C light can be provided, and a resin composition 1 that can effectively obtain the function of an additive including the UV-C light shielding function can be provided. Further, according to the above second embodiment, a cable or tube such as an ultrasonic probe cable 2 that uses the resin composition 1 as a material for a marker for visualizing the implementation status of past sterilization treatment, and a medical diagnostic device equipped with them can be provided.

[0045] (Summary of Embodiments) Next, the technical idea grasped from the embodiments described above will be described by referring to the reference numerals and the like in the embodiments. However, each reference numeral and the like in the following description are not limited to the members and the like that specifically show the components in the claims in the embodiments.

[0046] [1] A resin composition (1) having a base material (10) made of resin, a first additive (11) made of tungsten oxide that reversibly changes color by irradiation and shielding of UV-C light, and a second additive (12) that can shield UV-C light.

[0047] [2] The resin composition (1) according to [1] above, wherein the first additive is WO x (2.9 < x ≤ 3).

[0048] [3] The resin composition (1) according to [1] or [2] above, wherein the second additive contains at least one or more of aluminum oxide, cerium oxide, zinc oxide, indium oxide, zirconium oxide, tin oxide, manganese oxide, iron oxide, silicon oxide, and titanium oxide.

[0049] [4] The resin composition (1) according to [1] or [2] above, wherein the second additive contains titanium oxide.

[0050] [5] The base material contains at least one or more of high-density polyethylene, low-density polyethylene, fluororesin, polyvinyl chloride, synthetic rubber, silicone resin, chloroprene rubber, and polyurethane, and the resin composition (1) according to any one of the above [1] to [4].

[0051] [6] The hydrogenation reaction amount of ethylene on the surface (number of molecules / cm 2 ·s) is 10 times or more of the hydrogenation reaction amount of ethylene on the surface of Rh (rhodium), and the resin composition (1) according to any one of the above [1] to [5] having a catalyst as the third additive. -3 倍以上である触媒を第3の添加剤として有する、上記[1]~[5]のいずれか1項に記載の樹脂組成物(1)。

[0052] [7] The third additive contains at least one or more of palladium, platinum, and silver, and the resin composition (1) according to the above [6].

[0053] [8] A cable or tube (2) having markers (201, 321) on the surface for visualizing the implementation status of past sterilization treatment by UV-C light, and the markers (201, 321) are made of the resin composition (1) according to any one of the above [1] to [7].

[0054] [9] A medical diagnostic device provided with the cable or tube (2) according to the above [8].

[0055] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the invention. Further, the above embodiments do not limit the invention according to the claims. Also, it should be noted that not all combinations of the features described in the embodiments are essential means for solving the problems of the invention.

Explanation of Reference Numerals

[0056] 1 Resin composition 10 Base material 11 First additive 12 Second additive 2 Ultrasonic probe cable 20 Cables 201 markers 23 Sheath 24 Coating 31 Boots 32 Ultrasound probes 321 markers 50 Marker forming apparatus 58 Spraying device 59 Shutter

Claims

1. A base material made of resin, A first additive that reversibly changes color upon irradiation with UV-C light and shading, A second additive capable of blocking UV-C light, It has, The first additive consists of tungsten oxide, The second additive comprises at least one of aluminum oxide, indium oxide, manganese oxide, and silicon oxide. Resin composition.

2. The first additive is WO ｘ Having a composition (2.9 < x ≤ 3), The resin composition according to claim 1.

3. The aforementioned base material includes at least one of the following: high-density polyethylene, low-density polyethylene, fluororesin, polyvinyl chloride, synthetic rubber, silicone resin, chloroprene rubber, and polyurethane. The resin composition according to claim 1 or 2.

4. Having a third additive, Amount of ethylene hydrogenation reaction (number of molecules / cm³) on the surface of the third additive ２ ・s) is 10 times the amount of ethylene hydrogenation reaction on the surface of Rh (rhodium) －３ It is more than double. The resin composition according to any one of claims 1 to 3.

5. The third additive comprises at least one of palladium, platinum, and silver. The resin composition according to claim 4.

6. In a medical cable or tube, Markers are attached to its surface to visualize the status of past UV-C light sterilization treatments. The resin composition described in any one of claims 1 to 5 is used as the material for the marker. Cable or tube.

7. A cable or tube as described in claim 6, Medical diagnostic equipment.

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