JP6916989B2 - Cables and medical hollow tubes - Google Patents

Description

The present invention relates to cables and medical hollow tubes.

When silicone rubber is used as the material of the outermost layer of a cable such as a medical probe cable, the silicone rubber has a large frictional resistance and its surface is sticky, so that workability is deteriorated when it is taken in and out of a packaging bag.

Further, in medical devices such as catheters, silicone rubber, which has little effect on living tissues, is often used, so that there is a similar problem, and improvement in slidability is required (see, for example, Patent Document 1). ..

Japanese Unexamined Patent Publication No. 2008-287

For example, even if the surface of the outermost layer of the silicone sheath is subjected to uneven processing to achieve excellent slidability, it is necessary to wipe off dirt and the like on the surface of cables and the like in applications where it is used repeatedly. As the number of times of wiping increases, the unevenness of the surface is scraped, so that there is a problem that the slidability is lowered, that is, the frictional resistance is increased and the surface becomes sticky.

Therefore, an object of the present invention is to provide a cable having wiping resistance and a medical hollow tube capable of maintaining excellent slidability even if the number of times of wiping increases.

The present invention provides the following cables and medical hollow tubes to achieve the above object.

[1] A cable having a silicone rubber coating containing fine particles and pores as the outermost coating.
[2] The cable according to the above [1], wherein the fine particles are one or more selected from silicone resin fine particles, silicone rubber fine particles, and silica fine particles.
[3] The cable according to the above [1] or the above [2], wherein the fine particles are fine particles having a hardness higher than that of the silicone rubber constituting the silicone rubber film.
[4] The cable according to any one of [1] to [3], wherein the fine particles have an average particle size of 3 μm or more and 20 μm or less.
[5] The cable according to any one of [1] to [4], wherein the fine particles are contained in the silicone rubber coating in an amount of 10% by mass or more and 50% by mass or less.
[6] The cable according to any one of [1] to [5], wherein the hole has a length of 1 μm or more and 15 μm or less at the longest portion.
[7] The cable according to any one of [1] to [6], wherein the silicone rubber coating has a thickness of 3 μm or more and 50 μm or less.
[8] The cable according to any one of the above [1] to [7], wherein the silicone rubber coating has irregularities on its surface.
[9] The cable according to any one of [1] to [8], further comprising a sheath made of a composition containing silicone rubber or chloroprene rubber coated with the silicone rubber coating.
[10] A medical hollow tube having a silicone rubber coating containing fine particles and pores as the outermost coating or the innermost coating.

According to the present invention, it is possible to provide a cable having wiping resistance and a medical hollow tube that can maintain excellent slidability even if the number of times of wiping increases.

It is sectional drawing which shows an example of the cable which concerns on embodiment of this invention. It is a photograph which photographed the coating surface of the cable which concerns on embodiment of this invention ((a) is 200 times, (b) is 500 times, (c) is 1000 times). It is sectional drawing which shows typically the structure of the coating film of the cable which concerns on embodiment of this invention. It is sectional drawing which shows typically the structure of the coating film of the cable which concerns on a comparative example ((a) is comparative example 1, (b) is comparative example 2). It is a photograph which photographed the coating surface and the cross section of the cable (before and after the wiping resistance test) which concerns on an Example. It is a photograph of the coating surface of the cable (before and after the wiping resistance test) according to the comparative example. It is a graph which shows the coefficient of static friction of an Example and a comparative example in a wipe resistance test.

〔cable〕
The cable according to the embodiment of the present invention has a silicone rubber coating containing fine particles and pores as the outermost coating.

The cable according to the embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a cable according to an embodiment of the present invention.

The cable 10 according to the present embodiment shown in FIG. 1 is formed on a twisted core 5 in which three electric wires 3 are twisted together, a sheath 4 extruded and coated on the outer periphery of the twisted core 5, and an outer periphery of the sheath 4. It includes a filmed silicone rubber coating 6. The electric wire 3 may be a single core or a multi-core stranded wire other than the three cores.

The electric wire 3 includes a conductor 1 made of a general-purpose material such as pure copper or tin-plated copper, and an insulator 2 coated on the outer periphery of the conductor 1. The insulator 2 is not particularly limited as long as it can be used as an insulator material for electric wires, but for example, a rubber material such as polyethylene, polyvinyl chloride, capton, silicone rubber, ethylene propylene (EPR), or ETFE. , FEP, PFA, PTFE and other fluororesins. The conductor 1 is not limited to one, and may be a twisted plurality of conductors. Further, the electric wire 3 may be a coaxial wire, an optical fiber, or the like.

The sheath 4 is not particularly limited as long as it can be used as a sheath material, and examples thereof include silicone rubber, polyvinyl chloride, polyethylene, chlorinated polyethylene, and chloroprene rubber. In particular, the application value of the present invention is high when the sheath 4 is composed of a material having low slidability, that is, a material having high frictional force or a material having high adhesiveness. For example, a rubber composition such as silicone rubber or chloroprene rubber, which has an adhesiveness (stickiness) having a coefficient of static friction μ of 0.7 or more when used as a sheet base material, is a typical example. The above material can be used not only as a single material but also as a composition containing two or more kinds.

General compounding agents such as various cross-linking agents, cross-linking catalysts, anti-aging agents, plasticizers, lubricants, fillers, flame retardants, stabilizers, and colorants may be added to the composition serving as the sheath material.

The sheath 4 can be provided by extrusion coating and, if necessary, crosslinked.

The sheath 4 may also have a multi-layer structure. In this case, the application value of the present invention is high when the outermost layer of the multilayer structure is composed of the above materials.

The silicone rubber coating 6 is coated on the surface of the sheath 4, which is the outermost coating layer.

FIG. 2 is a photograph of the coating surface of the cable according to the embodiment of the present invention ((a) is 200 times, (b) is 500 times, and (c) is 1000 times). Further, FIG. 3 is a cross-sectional view schematically showing the structure of the coating film of the cable according to the embodiment of the present invention.

The silicone rubber coating 6 contains a large number of fine particles 62 and a large number of pores 63 in the silicone rubber 61, and is dispersed throughout the silicone rubber coating 6 as shown in FIG. In FIG. 2, the white spherical portion is the portion where the fine particles 62 are present, and the portion which looks like a black dot is the portion where the pores 63 are present. It is desirable that these are uniformly dispersed over the entire silicone rubber coating 6.

Further, the fine particles 62 are preferably scattered in the silicone rubber film 6 in the thickness direction (see FIG. 3). Even if the fine particles 62 are scraped off during wiping (or even if the surrounding silicone rubber 61 is scraped off and the fine particles 62 are removed), the silicone rubber 61 is also scraped off and new fine particles 62 are exposed, so that the non-woven fabric for wiping and the like can be used. Since the contact area of the particle can be kept small, the friction coefficient can be easily kept small.

As the fine particles 62, various fine particles such as silicone resin fine particles, silicone rubber fine particles, silica fine particles, and silver fine particles can be used, but the hardness is higher than that of the silicone rubber 61 constituting the silicone rubber coating 6 (for example, share (durometer A)). It is preferable that the fine particles have a hardness of about 1.1 times or more). The fine particles 62 are preferably one or more selected from silicone resin fine particles, silicone rubber fine particles, and silica fine particles, and more preferably silicone resin fine particles. The silicone rubber fine particles may be a spherical powder in which the surface of the spherical silicone rubber powder is coated with a silicone resin (so-called silicone composite powder).

The fine particles 62 are preferably spherical, have an average particle size of 3 μm or more and 20 μm or less, more preferably 3.5 μm or more and 15 μm or less, and even more preferably 4 μm or more and 10 μm or less.

Further, the fine particles 62 are preferably contained in the silicone rubber coating 6 in an amount of 10% by mass or more and 50% by mass or less, more preferably 15% by mass or more and 47% by mass or less, and 20% by mass or more and 45% by mass or less. It is more preferable that it is contained in an amount of% by mass or less. If it is less than 10% by mass, the wear resistance may decrease, and if it exceeds 50% by mass, it tends to be difficult for the fine particles 62 to adhere to the silicone rubber 61.

In FIG. 2, a coating material for surface modification of silicone rubber (trade name: X-93-1755-1, manufactured by Shin-Etsu Chemical Co., Ltd.) is used as a coating for silicone rubber 61, and average grains as fine particles 62 are used in the coating material. Silicone rubber fine particles (trade name: X-52-1621, manufactured by Shin-Etsu Chemical Co., Ltd.) with a diameter of 4.6 μm are added and dispersed to prepare a final coating liquid, which is applied and dried to make silicone rubber. A film 6 was formed. The silicone rubber film 6 contains 45% by mass of silicone resin fine particles.

On the other hand, the length of the longest portion of the pore 63 is 0.5 μm or more and 20 μm or less, preferably 1 μm or more and 15 μm or less, and more preferably 2 μm or more and 10 μm or less.

Even if the number of pores 63 is small, it contributes to the improvement of wiping resistance, which is an effect of the present invention, but it is preferable that the number of fine particles 62 is within ± 30%. A plurality of holes 63 may be connected.

In FIG. 2, the pores 63 having the longest length of 3 to 10 μm are formed in the silicone rubber coating 6, and the number of pores 63 is about ± 20% of the number of the fine particles 62.

Further, the silicone rubber coating 6 preferably has irregularities on its surface as shown in the cross-sectional views of FIGS. 3 and 5. As a result, the contact area with an object that comes into contact when the cable is moved can be reduced, so that the frictional force is further reduced and the slidability is improved. Specifically, for example, the surface roughness is preferably 0.2 μm or more, more preferably 0.4 μm or more, and further preferably 0.6 μm or more in terms of arithmetic mean roughness (Ra). preferable. The upper limit of the arithmetic mean roughness (Ra) is not particularly limited, but is preferably 5 μm or less.

In FIG. 2, the surface roughness of the silicone rubber coating 6 was 0.5 μm in arithmetic average roughness (Ra). Arithmetic mean roughness (Ra) measurement was performed with an ultra-depth shape measurement microscope (model: VK-8500) using a KEYENCE laser. The measurement range in the height direction was adjusted with the observation magnification set to 500 times and the measurement distance set to 298 μm, and the measurement was performed at a measurement pitch of 0.01 μm.

The thickness of the silicone rubber coating 6 is not particularly limited, but is preferably 3 μm or more and 50 μm or less, more preferably 6 μm or more and 30 μm or less, and further preferably 7 μm or more and 25 μm or less. In FIG. 2, the thickness of the silicone rubber coating 6 was 15 μm.

The silicone rubber film 6 can be formed by a general method, for example, by dip coating or spray coating. As the coating solution, a coating solution containing fine particles 62 in a silicone rubber coating material containing a volatile solvent for forming the pores 63 can be used. As the volatile diluting solvent, for example, toluene, n-heptane, benzene, ethylbenzene, o-xylene, m-xylene, p-xylene and the like can be used. The number and size of the pores 63 can be adjusted by selecting an appropriate volatile dilution solvent and adjusting the contents of the fine particles 62 and the solvent. In FIG. 2, vinyl is used as a coating material for silicone resin fine particles (trade name: X-52-1621, manufactured by Shin-Etsu Chemical Co., Ltd.) having an average particle size of 4.6 μm as fine particles 62 and silicone rubber 61 having pores. A material containing oximesilane, toluene, and n-heptane (trade name: X-93-1755-1, manufactured by Shin-Etsu Chemical Co., Ltd.) was used. A silicone rubber coating 6 was formed by a dip coating method (pulling speed: 2 m / s) using a solution containing 10 parts by mass of silicone resin fine particles with respect to 100 parts by mass of the silicone rubber coating material. Then, it dried at a temperature of 120 degreeC for 60 minutes. The ratio of the fine particles 62 in the film 6 after drying was 45%. This ratio is 12% of the non-volatile content in the coating liquid described in Shin-Etsu Chemical Co., Ltd. Silicone News Vol.130, Silicone rubber surface modification coating material (X-93-1710, X-93-1755-1). Was calculated based on. Specifically, (ratio of fine particles 62 in film 6 = 10 parts by weight <mass of fine particles 62> / {10 parts by weight <mass of fine particles 62> + (100 parts by weight <silicone rubber coating material> × 0.12) )}.
If the pore size of the finished film is too small, for example 0.1 μm or less, toluene, n-heptane, benzene, ethylbenzene, o-xylene, m-xylene, p-xylene, which are volatile diluting solvents for the coating liquid, are used. By adding such as, the diameter and number of pores generated by volatilization can be adjusted. Further, by increasing the pulling speed and increasing the thickness of the film, adjustments for increasing the pore diameter can be appropriately performed.

If necessary, the cable 10 according to the present embodiment may be further provided with a separator, a braid, a shield tape made of metal leaf, or the like.

The cables according to the embodiments of the present invention can be applied to cables for various purposes, and in particular, cables such as medical cables (endoscope cables, probe cables, connection cables for catheters, etc.) and cabtire cables, or between cables. It is suitable for cables that have problems with friction with contact objects and that are used repeatedly by wiping off dirt and the like.

[Medical hollow tube]
The present invention is not limited to cables, and can be applied to other objects used in applications where friction with contact objects is a problem, and in applications where dirt and the like are wiped off and used repeatedly, and in particular, catheters and the like. Suitable for medical hollow tubes. That is, the medical hollow tube according to the embodiment of the present invention has a silicone rubber coating containing fine particles and pores as the outermost coating. A configuration similar to that of a known medical hollow tube can be adopted except that the outermost coating has a silicone rubber coating containing the above-mentioned fine particles and pores. When an instrument is inserted into a medical hollow tube such as a catheter for use, a silicone rubber coating containing the above-mentioned fine particles and pores is used as the innermost coating (inner wall surface) of the medical hollow tube. Can be applied.

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited thereto.

[Evaluation of cable wiping resistance]
The cable having the structure shown in FIG. 1 was manufactured by the following method, and the wiping resistance was evaluated.

The size of each part of the cable (electric wire: 3 x 22 mm ^{2) is as follows.}
-Conductor configuration (conductor outer diameter / number of wires / wire diameter): 7 mm / 20 wires / 0.45 mm
・ Insulator thickness: 1.2 mm
・ Sheath thickness: 2.7 mm
・ Finished outer diameter: 26 mm

The electric wire 3 was obtained by extruding and coating each color (red, white, black) of sulfur-crosslinked EPR (ethylene propylene rubber) as an insulator 2 on the conductor 1 to a predetermined thickness, and then cross-linking with pressurized steam.

These three (each color) electric wires 3 were twisted together to obtain a twisted core 5. The outer circumference of the twisted core 5 was extruded and coated with a sheath material at a speed of 5 m / min by an extruder. Silicone rubber was used as the sheath material.

After coating the sheath, the surface of the sheath was cleaned, and then a silicone rubber film was formed on the surface of the sheath to obtain the cable of Example 1. Specifically, the average particle size is 4 with respect to 100 parts by mass of a silicone rubber coating material (trade name: X-93-1755-1, manufactured by Shin-Etsu Chemical Co., Ltd.) containing a volatile solvent (n-heptane, toluene). . Silicone with a thickness of 15 μm by dip coating method (pulling speed: 2 m / s) using a solution containing 10 parts by mass of silicone resin fine particles (trade name: X-52-1621, manufactured by Shin-Etsu Chemical Co., Ltd.) of 6 μm. A rubber film 6 was formed. The content of the silicone resin fine particles 62 in the silicone rubber coating 6 was 45% by mass. Further, the pores 63 having the longest portion having a length of 3 to 10 μm were formed in the silicone rubber coating 6, and the number of pores 63 was about ± 20% of the number of the fine particles 62.

Next, the cable of Comparative Examples 1 and 2 was obtained by changing the material of the coating film. The steps before forming a film on the sheath surface are the same as in Example 1 above.
In Comparative Example 1, a silicone resin film 16 having a thickness of 7 μm was formed by a dip coating method (pulling speed: 1.5 m / s) using a silicone resin (trade name: X-93-1710, manufactured by Shin-Etsu Chemical Co., Ltd.) solution. A film was formed (see FIG. 4 (a)).
In Comparative Example 2, a silicone rubber coating film 26 having a thickness of 7 μm was formed by a dip coating method (pulling speed: 2 m / s) using a silicone rubber (trade name: X-93-1755-1, manufactured by Shin-Etsu Chemical Co., Ltd.) solution. A film was formed (see FIG. 4 (b)).

The cables of Examples and Comparative Examples were cut out by 15 cm each, and the following wiping resistance tests were performed on each of them.

(Wipe resistance test method)
Make a cut in the length direction of the sheath of the coated cable, remove the contents other than the sheath, open the sheath, and paste it on a flat sheet so that it becomes a flat sheet with a length of about 15 cm and a width of about 8 cm. By attaching, a test sheet was prepared. The coating surface was wiped with a 5 cm square non-woven fabric having one end of the test sheet and containing ethanol for disinfection. To prevent the non-woven fabric from drying, the non-woven fabric was impregnated with disinfectant ethanol each time it was wiped 10 times. The non-woven fabric was replaced with a new one every time it was wiped 300 times. The wiping was repeated in one direction, and the wiping was performed 10,000 times in Example 1 and Comparative Example 2 and 5,000 times in Comparative Example 1. The wiping force was measured by fixing the test sheet on the scale, pressing the coating surface with a non-woven fabric and wiping it, and measuring the amount. By performing this measurement every time before the wiping test, the levels were made uniform. The specific wiping load was about 0.3 kg. The wiping was performed at a wiping distance of about 15 cm / time and a speed of about 75 times / minute.

Before and after the wiping resistance test, the surface of the coating was photographed (1000 times). For Example 1, a photograph of the cross section was also taken (1000 times). FIG. 5 is a photograph of the coating surface and cross section of the cable (before and after the wiping resistance test) according to the example, and FIG. 6 is a photograph of the coating surface of the cable (before and after the wiping resistance test) according to the comparative example. be.

Further, the coefficient of static friction of the coating surface was measured before and after the wiping resistance test and during the test (500 times in Comparative Examples 1 and 2 and 5,000 times in Example 1 and Comparative Example 2).
To measure the coefficient of static friction, process the coated cable in the same way as the wiping resistance test, or process the test sheet after the wiping test to make a flat sheet with a length of about 10 cm and a width of about 2.5 cm. It was attached to a flat plate so as to be (Sheet 1). Further, a cable coated in the same manner or a test sheet after the wiping test was processed to cut out a 1.5 cm × 1.5 cm square sheet and attached to a flat plate (Sheet 2). The coated surface of the sheet 1 or the surface after wiping is brought into contact with the coated surface of the sheet 2 or the surface after wiping from above so as to face each other, and a load W of 2N is applied from the top of the flat plate of the sheet 2. While hanging, the flat plate with the sheet 2 was pulled horizontally with a push-pull gauge, and the pulling force (friction force) F was measured. The coefficient of static friction μ was calculated from F = μW.
FIG. 7 is a graph showing the coefficient of static friction of Examples and Comparative Examples in the wipe resistance test.

As can be seen from FIG. 7, the cable surface of Example 1 in which the silicone rubber coating film 6 containing fine particles and pores is formed as the outermost coating has a small coefficient of static friction before and after the wiping resistance test (before the test: 0.16, 1). After the 10,000-time wiping test: 0.18), a cable having wiping resistance (that is, less sticky) capable of maintaining excellent slidability even when the number of wiping times increased was obtained. On the other hand, in the cables of Comparative Examples 1 and 2, the coefficient of static friction was larger than that of Example 1, and the coefficient of static friction was significantly increased after the wiping resistance test (before the test of Comparative Example 1: 0.7, of Comparative Example 1). After the 5,000-time wiping test: 0.82, before the test of Comparative Example 2: 0.3, after the 10,000-time wiping test of Comparative Example 2: 0.43).
The silicone rubber coating 6 has pores 63 and is sponge-like. Therefore, it is considered that the silicone rubber coating 6 is easily deformed by the stress applied during the wiping test and acts to release this stress to improve the wiping resistance of the cable surface of Example 1. In this way, the cable of Example 1 in which the silicone rubber coating film 6 containing fine particles and pores is formed has a surface regardless of whether it is initially wiped 5,000 times or further wiped 10,000 times. No stickiness was felt, and the coefficient of static friction was 0.3 or less, preferably 0.25 or less, and more preferably 0.20 or less.

The arithmetic mean roughness (Ra) measured before and after the wiping resistance test is as shown in Table 1 below. The arithmetic mean roughness (Ra) was measured using a KEYENCE laser microscope system (VK-8500).

As can be seen from Table 1, the cable surface of Example 1 in which the silicone rubber coating film 6 containing fine particles and pores is formed has a larger arithmetic mean roughness (Ra) than the cable surfaces of Comparative Examples 1 and 2. Even after the test, the decrease was only about 20%.

Further, although the cables of Example 1 and Comparative Example 2 were excellent in flexibility, the cables of Comparative Example 1 were not sufficiently flexible due to cracks at the time of bending (R5 mm).

The present invention is not limited to the above-described embodiments and examples, and various modifications can be made.

For example, an adhesion reinforcing layer made of a primer, a silane coupling agent, or the like for enhancing the adhesion between the sheath and the silicone rubber coating may be provided on the surface of the sheath. In addition, the surface of the sheath is subjected to a flame treatment that is exposed to a flame for a short time, or a plasma treatment that ionizes and radicalizes a gas and causes it to collide with the surface, or ionizes a component in the air and exposes it to an atmospheric discharge. A surface modification layer may be formed on the surface of the sheath by a method such as corona treatment to improve the adhesion between the sheath and the silicone rubber coating. Further, the silicone rubber film may be formed after the close contact reinforcing layer is provided on these surface modification layers.

When manufacturing a probe cable by attaching a probe body with a cable bush to one end of the cable, an adhesive is applied on the silicone rubber coating located at the end, and the cable bush is adhesively fixed via this adhesive layer. You may. Further, the cable bush may be adhesively fixed by using the adhesive reinforcing layer and the adhesive layer in combination or the surface modification layer and the adhesive layer in combination. The close contact reinforcing layer and the surface modification layer may be formed only at the place where the cable bush is fixed, or may be formed over the entire length of the sheath.

Alternatively, the sheath and the cable bush may be directly bonded and fixed with an adhesive by masking or removing the cable bush in advance so as not to provide a silicone rubber coating. good. Further, the surface modification layer may be formed at a portion where the silicone rubber coating is not provided, and then an adhesive may be applied onto the surface modification layer to bond and fix the sheath and the cable bush.

(Tensile shear strength test method)
Two silicone rubber sheets having a width of 25 mm and a length of 15 mm were prepared. A liquid silicone rubber-based adhesive was applied on one of the silicone rubber sheets in a region having a width of 25 mm and a length of 10 mm. Two silicone rubber sheets were adhesively fixed via this adhesive layer to prepare a tensile shear strength test sample of Experimental Example 1.

The tensile shear strength test sample of Experimental Example 2 was prepared by adding a step of forming a silicone rubber film to the step of preparing the tensile shear strength test sample of Example 1, and the other steps are the same. Specifically, a silicone rubber film was formed on the entire surface of one of the silicone rubber sheets. Two silicone rubber sheets were adhered and fixed via a liquid silicone rubber-based adhesive layer formed on the silicone rubber film.

The tensile shear strength test sample of Experimental Example 3 was prepared by adding a surface modification layer and a silicone rubber coating forming step to the manufacturing step of the tensile shear strength test sample of Example 1, and the other steps were prepared. It is the same. Specifically, a surface-modified layer was formed on one of the silicone rubber sheets by performing a flame treatment, and a silicone rubber film was formed on the entire surface of the surface-modified layer. Two silicone rubber sheets were adhered and fixed via a liquid silicone rubber-based adhesive layer formed on the silicone rubber film.
The silicone rubber coatings of Experimental Example 2 and Experimental Example 3 were formed under the same conditions as in Example 1.

These tensile shear strength test samples 1 to 3 were pulled in a direction parallel to the adhesive surface at a tensile speed of 500 mm / min to evaluate the tensile shear strength (maximum load when the sample was broken).

As can be seen from Experimental Examples 1 and 2, when the silicone rubber sheets are attached to each other, a tensile shear strength of 100 N or more can be obtained, but when the silicone rubber film is interposed, the tensile shear strength is 50 N. This is due to the weak strength between the silicone rubber coating and the silicone rubber sheet, the high tensile shear strength coating itself, or between the silicone rubber coating and the adhesive layer.

On the other hand, as can be seen from Experimental Examples 2 and 3, by forming a surface modification layer between the silicone rubber coating and the silicone rubber sheet, the adhesion between the silicone rubber coating and the silicone rubber sheet can be improved. , The tensile shear strength can be 80 N or more. By forming a close contact reinforcing layer or a surface modification layer between a high-strength coating or a silicone rubber coating and an adhesive layer, it is possible to obtain even higher tensile shear strength.

10: Cable 1: Conductor, 2: Insulator, 3: Electric wire, 4: Sheath, 5: Twisted core 6, 26: Silicone rubber coating, 16: Silicone resin coating 61: Silicone rubber, 62: Fine particles, 63: Empty Hole

Claims (10)

A cable having a silicone rubber coating containing fine particles and pores as the outermost coating .
A cable in which when the surface of the silicone rubber coating is observed at a magnification of 200 times, a portion that looks like a black dot indicating the pores is observed. The cable according to claim 1, wherein the fine particles are one or more selected from silicone resin fine particles, silicone rubber fine particles, and silica fine particles. The cable according to claim 1 or 2, wherein the fine particles are fine particles having a hardness higher than that of the silicone rubber constituting the silicone rubber coating. The cable according to any one of claims 1 to 3, wherein the fine particles have an average particle size of 3 μm or more and 20 μm or less. The cable according to any one of claims 1 to 4, wherein the fine particles are contained in the silicone rubber coating in an amount of 10% by mass or more and 50% by mass or less. The cable according to any one of claims 1 to 5, wherein the hole is the cable having the longest portion having a length of 1 μm or more and 15 μm or less. The cable according to any one of claims 1 to 6, wherein the silicone rubber coating has a thickness of 3 μm or more and 50 μm or less. The cable according to any one of claims 1 to 7, wherein the silicone rubber coating has irregularities on its surface. The cable according to any one of claims 1 to 8, further comprising a sheath made of a composition containing silicone rubber or chloroprene rubber coated with the silicone rubber coating. A medical hollow tube having a silicone rubber coating containing fine particles and pores as the outermost coating or the innermost coating .
A medical hollow tube in which when the surface of the silicone rubber coating is observed at a magnification of 200 times, a portion that looks like a black dot indicating the pores is observed.

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