JP2002186624A - Forceps - Google Patents

Abstract

(57) [Problem] To provide a forceps that can easily open and close a holding portion. Kind Code: A1 A forceps includes a link mechanism, and a clamping unit that opens and closes by operation of the link mechanism, an operation unit that performs opening and closing operations of the clamping unit, and a clamping unit that is connected to the operation unit. And a flexible portion 3 provided therebetween. The flexible portion 3 includes a sheath and a wire that is inserted into the sheath so as to be movable relative to the sheath, and connects the holding portion 4 and the operation portion 2. A coating layer composed of diamond-like carbon (DLC) is formed on at least a part of the outer surface of the wire and / or the inner surface of the sheath. Further, it is preferable that the coating layer is formed on at least a part of the outer surface of the link mechanism. The average thickness of the coating layer 4 is preferably 0.1 to 10 μm. Coefficient of friction μ of coating layer 4 measured by ball-on-disk method
Is preferably 0.05 to 0.7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to forceps.

[0002]

2. Description of the Related Art Forceps capable of grasping a living tissue by remote control are known. Such a forceps is generally provided with a holding portion for collecting a mucous membrane in a body cavity or the like at a distal end portion, an operation portion for remotely opening and closing the holding portion, and a position between the holding portion and the operation portion. Provided sheath, inside the sheath,
A wire is movably inserted through the sheath and connects the holding section and the operation section.

In such forceps, when an opening and closing operation is performed on the holding portion by the operating portion, friction is generated between the wire and the sheath, and pressure is applied. Such friction and pressure become particularly large when the wire or sheath is curved. As described above, when friction or pressure is applied between the wire and the sheath, a large force must be applied to the operation unit when opening and closing the holding unit. As described above, since a large force is required at the time of operating the forceps, the patient may be unnecessarily distressed due to camera shake or the like. Further, when the friction between the wire and the sheath is particularly large (for example, when the wire and the sheath are looped with a small radius of curvature), by applying a force with the operation unit,
Sometimes the wire broke.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a forceps which can easily open and close a holding portion.

[0005]

This and other objects are achieved by the present invention which is defined below as (1) to (12).

(1) A forceps capable of remotely opening and closing a holding portion by pulling a wire, wherein at least one of an outer surface of the wire and / or an inner surface of a member that stores the wire is provided. A forceps, wherein a coating layer made of diamond-like carbon (DLC) is formed on the portion.

[0007] Thus, it is possible to provide a forceps capable of easily opening and closing the holding portion.

[0008] (2) It is provided with a link mechanism section, a holding section that opens and closes by the operation of the link mechanism section, an operation section that opens and closes the holding section, and is provided between the holding section and the operation section. And a wire which is inserted into the sheath so as to be movable relative to the sheath and connects the link mechanism and the operating portion, wherein the outer surface of the wire and / or A forceps, wherein a coating layer made of diamond-like carbon (DLC) is formed on at least a part of the inner surface of the sheath.

Thus, a forceps capable of easily opening and closing the holding portion can be provided.

(3) The forceps according to (2), wherein the sheath is flexible and bendable. Thereby, the operability of the forceps is further improved.

(4) The forceps according to the above (2) or (3), wherein a coating layer made of diamond-like carbon (DLC) is formed on at least a part of the outer surface of the link mechanism. Thereby, the opening and closing operation of the holding portion can be performed more easily.

(5) The forceps according to any one of the above (1) to (4), wherein the coating layer is formed by a vapor deposition method. Thereby, the adhesion between the coating layer and the portion where the coating layer is formed is improved.

(6) The forceps according to the above (5), wherein the vapor deposition method is any one selected from a chemical vapor deposition method (CVD), sputtering, vacuum deposition, and ion plating. Thereby, the adhesion between the coating layer and the portion where the coating layer is formed is improved.

(7) The coating layer has a thickness of 0.05 to 30 μm.
The forceps according to any one of the above (1) to (6), which is formed at a film forming rate of m / h. Thereby, a coating layer having excellent lubricity can be formed with high productivity.

(8) The average thickness of the coating layer is 0.1
The forceps according to any one of the above (1) to (7), which has a diameter of 10 to 10 μm. Thereby, the opening and closing operation of the holding portion can be performed more easily.

(9) The forceps according to any one of (1) to (8), wherein the coefficient of friction μ of the coating layer measured by a ball-on-disk method is 0.05 to 0.7.
Thereby, the opening and closing operation of the holding portion can be performed more easily.

(10) The forceps according to any one of the above (1) to (9), wherein the coating layer is formed via a base layer. Thereby, the adhesion between the coating layer and the portion where the coating layer is formed is improved.

(11) The underlayer is made of W, Cr, T
The forceps according to the above (10), which is made of a material containing at least one of i, Co, Si, and Al. Thereby, the adhesiveness between the coating layer and the portion where the coating layer is formed is further improved.

(12) The above (10) or (1), wherein the underlayer is formed by sputtering.
The forceps according to 1). Thereby, the adhesiveness between the coating layer and the portion where the coating layer is formed is further improved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The forceps of the present invention will be described below in detail based on a preferred embodiment shown in the accompanying drawings.

FIG. 1 is an overall view showing an embodiment of the forceps of the present invention, FIG. 2 is an enlarged longitudinal sectional view showing the vicinity of a sheath portion where a wire of the forceps shown in FIG. 1 is inserted, and FIG. 4 is an enlarged vertical cross-sectional view of the vicinity of the link mechanism when the clamp of the forceps is closed, and FIG. 4 is an enlarged vertical cross-sectional view of the vicinity of the link mechanism when the clamp of the forceps shown in FIG. 1 is open. Hereinafter, in FIGS. 1 to 4, the upper side is referred to as “base end”, and the lower side is referred to as “distal end”.

As shown in FIG. 1, the forceps 1 includes a holding section 4 that opens and closes, and an operation section 2 that remotely opens and closes the holding section 4.
And a flexible portion 3 having flexibility.

The operation unit 2 has an operation ring 21 and a slider 22 that can move relative to the operation ring 21. The operation ring 21 is connected to the holding section 4 via a wire 32 described later. Therefore, the holding portion 4 can be opened and closed by relatively moving the operation ring 21 and the slider 22 in the longitudinal direction of the forceps 1. For example, in a state where the holding portion 4 is closed, the slider 22
By moving the operation ring 21 relatively to the distal end side (for example, by moving the operation ring 21 in the direction indicated by the arrow A in the figure while fixing the slider 22), the holding portion 4 is opened. . On the other hand, by moving the operation ring 21 relatively to the slider 22 with respect to the slider 22 in a state where the holding portion 4 is opened (for example, while the slider 22 is fixed, the operation ring 21 is (In the direction shown), the clamping part 4 is closed.

The flexible portion 3 includes a sheath 31 as shown in FIG.
And a wire 32 inserted into the sheath 31.

The wire 32 is relatively movable with respect to the sheath 31, and its proximal end is connected to the operating ring 21 of the operating section 2, and its distal end is connected to the holding section 4 having the link mechanism section 6. Connected. For this reason, the force applied by the operation unit 2 is transmitted to the holding unit 4 including the link mechanism unit 6 via the flexible unit 3.

The sheath 31 is formed of a coil pipe in which a metal wire such as stainless steel or the like is spirally tightly wound with a substantially constant diameter.

As the wire 32, a wire having strength and durability that does not cause disconnection due to frequent pulling operations, and having a small elongation is used. Examples of such a wire 32 include a metal wire such as stainless steel, a single wire made of resin fibers such as polyamide and polyester, and a fiber bundle.

The outer diameter of the wire 32 varies depending on its constituent materials and various conditions such as the cross-sectional shape, dimensions, and constituent materials of the sheath 31. However, the wire 32 is made of, for example, a polyacrylate twisted yarn or a single line of stainless steel. If it is, its outer diameter is preferably about 0.1 to 1.5 mm,
It is more preferably about 0.12 to 1 mm.

The entire surface of the outer surface of the wire 32 and the inner surface of the sheath 31 is coated with diamond-like carbon (DL).
C) is provided. Coating layer 5
Has excellent lubricity, as described in detail later.
Thereby, the frictional resistance between the wire 32 and the sheath 31 becomes small. Thus, for example, wire 32
Even when the wire and the sheath 31 are pressed against each other, the relative movement between the wire 32 and the sheath 31 can be performed smoothly, and as a result, the opening and closing operation of the holding portion 4 can be easily performed. It becomes possible. Further, since the relative movement between the wire 32 and the sheath 31 can be performed smoothly, breakage of the wire 32 and the like can be effectively prevented. As a result, the medical operation using the forceps 1 can be performed more safely.

In the illustrated configuration, the coating layer 5 is formed on the entire outer surface of the wire 32 and the entire inner surface of the sheath 31.
Is formed, but the coating layer 5 may be formed on at least a part of the outer surface of the wire 32 and / or the inner surface of the sheath 31.

As shown in FIGS. 3 and 4, the holding portion 4 has holding cups 41 and 42, and at the base end side thereof,
A link mechanism 6 is provided. And the link mechanism 6
Are connected to the wire 32 as described above.

Hereinafter, connection between the wire 32 and the holding cups 41 and 42 via the link mechanism 6 will be described in detail.

The holding cups 41 and 42 are rotatably supported by pins 43. Also, the holding cup 41
At its proximal end, the link 6
1 is rotatably connected to the base end side. Similarly, the holding cup 42 is rotatably connected to the base end of the link 62 by a pin 63 at the base end.
Further, the link 61 and the link 62 are rotatably connected to each other at a base end side thereof by a pin 65. At the same time, links 61 and 62
Is pivotally supported on the distal end side of the wire 32.

As described above, the wire 32 is connected to the link mechanism 6.
, The longitudinal movement of the flexible part 3 is converted into a turning movement of the holding part 4.

For example, in the state shown in FIG. 3, the operation ring 21 is moved toward the distal end relative to the slider 22 so that the wire 32 is moved toward the distal end relative to the sheath 31. I do. Along with this, wire 3
On the distal end side of 2, the links 61 and 62 connected by the pin 65 rotate so that the pins 63 and 64 move away in the left and right directions in the figure. As a result, the holding cup 41,
Reference numeral 42 rotates about the pin 43 as an axis, and the holding portion 4 is in an open state as shown in FIG.

On the other hand, by moving the operation ring 21 relatively to the slider 22 in the state shown in FIG. Go to Along with this, the wire 32
, The links 61 and 62 connected by the pin 65 rotate in the direction in which the pins 63 and 64 approach each other. As a result, the pinching cups 41 and 42
3, and the holding portion 4 is closed as shown in FIG. 3.

At least a part of the outer surface of the link mechanism 6 includes the outer surface of the wire 32 and the sheath 3
Like the inner surface of No. 1, it is preferable that a coating layer 5 composed of diamond-like carbon (DLC) is formed. Thereby, it becomes possible to more easily perform the opening / closing operation of the holding portion 4.

As described above, the present invention is characterized in that it has the coating layer 5 made of diamond-like carbon (DLC).

Hereinafter, the coating layer 5 will be described in detail. The coating layer 5 is composed of diamond-like carbon (DLC) containing C (carbon) as a main component. Such a coating layer 5 is
It has the following advantages.

1. Lubricity The coating layer 5 composed of DLC has excellent lubricity. For this reason, the friction at the portion where the coating layer 5 is formed can be effectively reduced. As a result, the flexible portion 3
Even when is curved, it is possible to easily perform the opening / closing operation of the holding portion 4. Further, breakage of the forceps 1 (for example, breakage of the wire 32, etc.) can also be effectively prevented.

As an index indicating lubricity, for example, JI
And a friction coefficient μ by a ball-on-disk method measured according to SR1613. The coefficient of friction μ of the coating layer 5 measured by the ball-on-disk method is 0.0
It is preferably about 5 to 0.7, more preferably about 0.1 to 0.5, and even more preferably about 0.1 to 0.35. When the friction coefficient μ of the coating layer 5 is in such a range, the friction at the portion where the coating layer 5 is formed can be more effectively reduced, and the holding portion 4
Can be more easily opened and closed.

2. Chemical Resistance The forceps 1 may be immersed in a chemical such as a disinfectant before and after use. Some of these chemicals are highly corrosive,
Due to prolonged use, the constituent material of the forceps 1 may be corroded.

Incidentally, the coating layer 5 composed of DLC
Has excellent chemical resistance. Therefore, the coating layer 5 is hardly deteriorated or deteriorated even when it comes into contact with such a chemical.

Therefore, the coating layer 5 composed of DLC
Can be used for a long time without deterioration even in an environment where it is in daily contact with chemicals such as a disinfectant.

3. The antifouling forceps 1 is used, for example, for collecting biological tissues such as mucous membranes. For this reason, dirt such as mucus may adhere to the forceps 1 during use.

By the way, the coating layer 5 composed of DLC
Has excellent antifouling properties. Therefore, dirt such as mucus hardly adheres to the coating layer 5. Further, even when dirt is attached, the dirt can be easily removed. Therefore, even if the forceps 1 having the coating layer 5 made of DLC is used repeatedly, it is possible to more reliably prevent an infection or the like caused by an attached matter.

4. Abrasion resistance The coating layer 5 composed of DLC has excellent abrasion resistance. For this reason, even if it is provided in a portion where repeated friction occurs, the above-described effect can be maintained for a long period of time. Therefore, the coating layer 5 composed of DLC
Has excellent durability.

As described above, the coating layer 5 composed of DLC
Has the above four excellent advantages, and a synergistic effect of these provides a superior forceps 1.

Such a coating layer 5 may be formed by any method, but is preferably formed by a vapor phase film forming method.
D, chemical vapor deposition methods such as plasma CVD (RF plasma CVD, ECR plasma CVD, etc.) and laser CVD (C
It is preferably formed by any one of sputtering such as VD), chemical sputtering, and physical sputtering, vacuum deposition, and ion plating. By using these methods, a uniform coating layer 5 with less unevenness can be obtained relatively easily.

Hereinafter, an example of a method of forming the coating layer 5 by sputtering will be described. The sputtering is usually performed in an atmosphere gas mainly containing an inert gas such as an argon gas and a helium gas, and the atmosphere gas contains a hydrocarbon gas such as a methane gas and an ethane gas, a hydrogen gas, and the like. Is preferred. Thereby, the obtained coating layer 5 can be constituted by hydrogenated DLC. When the coating layer 5 is composed of hydrogenated DLC, the friction coefficient of the coating layer 5 is reduced, and the lubricity is further improved.

The total content of hydrocarbon gas and hydrogen gas in the atmosphere gas is preferably at least 10 vol%. This makes it possible to more effectively perform hydrogenation on DLC.

The atmosphere gas contains, for example, O ₂ ,
A reactive gas such as N ₂ or NH ₃ may be contained. By performing sputtering in an atmosphere gas containing such a reactive gas, the coating layer 5 to which elements other than C and H are added can be formed. Thereby, it is possible to enhance the adhesion to the portion where the coating layer 5 is formed, and to adjust the hardness and the like of the coating layer 5. Also, as a target,
Usually, graphite or the like is used.

The target may be a material containing an element other than C and H (eg, N, O, Ti, Al, Cr, Si, etc.), or a mixture of such a material and graphite. Good. Thereby, the coating layer 5 to which elements other than C and H are added can be formed. As a result, it is possible to increase the adhesion to the portion where the coating layer 5 is formed, and to adjust the hardness and the like of the coating layer 5.

It is preferable that such sputtering is performed by high frequency (RF) discharge. This allows
The plasma density can be increased, and arc discharge can be effectively prevented.

The deposition rate of the coating layer 5 is not particularly limited, but is preferably 0.05 to 30 μm / h.
More preferably, it is 1 to 20 μm / h. When the film forming speed of the coating layer 5 is less than the lower limit, it takes time to form the film, and the productivity of the forceps 1 is reduced. On the other hand, when the deposition rate of the coating layer 5 exceeds the upper limit, the thickness of the coating layer 5 tends to vary widely.

The average thickness of the coating layer 5 is not particularly limited, but is preferably 0.1 to 10 μm, and is preferably 0.5 to 7 μm.
μm is more preferable, and 1 to 5 μm is further preferable. If the average thickness of the coating layer 5 is less than the lower limit, the effects of the present invention may not be sufficiently obtained. On the other hand, when the average thickness of the coating layer 5 exceeds the upper limit, the flexibility of the portion where the coating layer 5 is formed may be reduced.

Prior to the formation of the coating layer 5, the coating layer 5
An underlayer (not shown) may be formed at the formation site of the above. The underlayer is not particularly limited, but may be W, Cr, Ti,
It is preferable that it is made of a material containing at least one of Co, Si and Al. Thereby, the adhesion to the formation site of the coating layer 5 is improved.

Such an underlayer may be formed by any method, but is preferably formed by a vapor deposition method, and is preferably formed by sputtering. More preferred. When the underlayer is formed by sputtering, the coating layer 5 having uniform and stable adhesion can be formed relatively easily.

The thickness of the underlayer is not particularly limited.
It is preferably about 0.01 to 2 μm,
More preferably, it is about 1 μm.

Prior to forming the coating layer 5 and the underlayer,
A pretreatment such as a cleaning treatment, a blast treatment, or an etching treatment may be performed.

The provision of the coating layer 5 as described above provides particularly excellent lubricity, so that friction at the portion where the coating layer 5 is formed is suppressed, and the opening and closing operation of the holding portion 4 can be easily performed. be able to.

Moreover, the forceps 1 having excellent chemical resistance can be obtained. Therefore, the forceps 1 is hardly deteriorated even when exposed to a chemical such as a disinfectant, and can be repeatedly used for sterilization and sterilization using the chemical and the like.

These effects become more remarkable by appropriately selecting the composition of the coating layer 5 and the like.

Although the preferred embodiment of the forceps of the present invention has been described above, the present invention is not limited to this.

For example, the portion where the coating layer 5 is disposed is not limited to the above-described portion. For example, a coating layer may be provided on the outer surface of the sheath, the outer surface of the holding portion (holding cup), or the like.
Thereby, the antifouling property and corrosion resistance of the forceps are further improved.
In particular, when the forceps inserted into the guide tube is used by inserting it into the body cavity, a coating layer is provided on the outer surface of the sheath, so that the inner surface of the guide tube (including the forceps channel of the endoscope) through which the forceps are inserted is provided. Then, friction between the sheath and the outer surface of the sheath is reduced, so that the operability of the forceps is further improved.

The sheath may be, for example, a rigid body that does not substantially curve. Further, in the above-described embodiment, the composition, the thickness, and the like are described as being constant in each part of the coating layer. However, these conditions may be different in each part.

Further, the sheath may be formed by stacking two or more coil pipes.

[0068]

Next, specific examples of the present invention will be described.

1. Production of forceps (Example 1) Using stainless steel (SUS304) as a constituent material of a sheath, a wire, and a link mechanism, FIG.
~ Forceps as shown in Fig. 4 were produced. The length of the flexible portion was 4500 mm.

The coating layer was formed on the entire outer surface of the wire and the entire inner surface of the sheath. The formation of the coating layer was performed by sputtering.

The sputtering was performed as follows using a vacuum apparatus (“DLC-MR2” manufactured by Shimadzu Corporation).

First, argon gas: 60 V
ol% and a mixed gas of methane gas: 40 vol%. Thereafter, the atmosphere pressure was adjusted to 0.6 Pa by adjusting the flow rate and the exhaust amount of the mixed gas.

After adjusting the atmospheric pressure in the vacuum apparatus, a coating layer was formed by performing high-frequency discharge using graphite as a target.

The flow rate of the mixed gas during sputtering was 60 SCCM, and the atmospheric pressure was 0.6 Pa. The high frequency power was 500W. The film forming speed was 0.4 μm / h. The average thickness of the coating layer thus formed was 0.1 μm.

(Example 2) A forceps was prepared in the same manner as in Example 1 except that the average thickness of the coating layer was 1 µm.

Example 3 A forceps was manufactured in the same manner as in Example 1 except that the average thickness of the coating layer was 5 μm.

Example 4 A forceps was manufactured in the same manner as in Example 1 except that the coating layer was formed on the entire outer surface of the wire, the entire inner surface of the sheath, and the entire outer surface of the link mechanism. .

Example 5 A forceps was prepared in the same manner as in Example 4 except that the average thickness of the coating layer was 1 μm.

Example 6 A forceps was manufactured in the same manner as in Example 4 except that the average thickness of the coating layer was 5 μm.

(Example 7) Prior to the formation of the coating layer, an underlayer made of W (average thickness 0.02
μm) was formed in the same manner as in Example 4 except that the forceps was formed by sputtering.

Example 8 A forceps was prepared in the same manner as in Example 7, except that the average thickness of the coating layer was 5 μm.

(Example 9) Prior to the formation of the coating layer, an underlayer made of Si (with an average thickness of 0.0
2 μm) was formed in the same manner as in Example 4 except that the forceps was formed by sputtering.

Example 10 The average thickness of the coating layer was 5 μm.
A forceps was produced in the same manner as in Example 9 except that the above procedure was adopted.

(Comparative Example) A forceps was manufactured in the same manner as in Example 1 except that the covering layer was not formed.

2. Evaluation <Evaluation of friction coefficient> First, the friction coefficient of the DLC film was evaluated.

A DLC film was formed on the upper surface of the SUS304 disk under the same conditions as in Examples 1 to 10. A disk (diameter 40 mm x thickness 5 mm) on which a DLC film is formed and a SUS304 ball (diameter 10 m
m), the friction coefficient μ (friction coefficient μ at the initial, middle and final stages) was measured by the ball-on-disk method according to JIS R 1613. Ball-on-disk friction and wear testing machines include Centre Suisse D '
Electronique et de Microtechnique SA “CS
EM TRIBOMETER "was used.

As a result, the measured values of the friction coefficient μ of the DLC film were all in the range of 0.15 to 0.18.

<Evaluation of Opening / Closing Operability of Holding Section> Using the forceps obtained in each example and comparative example, the following evaluation was performed.

First, as shown in FIG. 1, each forceps was in a state where the flexible portion was not curved. In such a state, while the slider was fixed, the operation ring was repeatedly moved in the direction indicated by the arrow A and the direction indicated by the arrow B in the figure to open and close the holding portion. The operability of opening and closing the holding portion is as follows.
The evaluation was made according to the scale of the scale. ：: The amount of force required to open and close the holding portion is optimal, and is optimal for use as forceps. ：: The amount of force required to open and close the holding portion is appropriate and suitable for use as forceps. Δ: The amount of force required for opening and closing the holding portion is somewhat large, and there is a problem in use as a forceps. ×: The amount of force required to open and close the holding portion is extremely large, and is not suitable for use as a forceps.

Thereafter, for each forceps, the flexible portion was curved with a radius of curvature of 100 mm, and a loop was formed by the curved flexible portion. In the state where the formed loops were single-layered, double-layered, and triple-layered, the operability of opening and closing the holding portion was evaluated in the same manner as above.

Table 1 shows the results. Table 1 also shows the conditions of the coating layer of each forceps.

[0092]

[Table 1]

As is clear from Table 1, each of the forceps of the present invention has excellent operability for opening and closing the holding portion, and has excellent operability even when the flexible portion is curved. Had been maintained.

On the other hand, the forceps of the comparative example was inferior in operability of opening and closing the holding portion. In particular, when the flexible portion was curved, the amount of force required to open and close the holding portion was very large.

[0095]

As described above, according to the present invention, it is possible to obtain a forceps excellent in operability of opening and closing the holding portion.

In addition, because of its excellent chemical resistance, it is possible to obtain a forceps that can be repeatedly sterilized to a high degree.

Further, since the coating layer has excellent antifouling properties, it is possible to more reliably prevent infectious diseases and the like caused by deposits.

Further, since the coating layer has excellent wear resistance, the above-mentioned effects can be maintained for a long period of time. That is, forceps having excellent durability can be obtained.

Such effects become more remarkable by appropriately selecting the composition and the like of the coating layer.

[Brief description of the drawings]

FIG. 1 is an overall view showing an embodiment of a forceps of the present invention.

FIG. 2 is a partial sectional view showing the vicinity of a central portion of a flexible portion of the forceps shown in FIG.

FIG. 3 is a partial cross-sectional view of the vicinity of a link mechanism in a state where a holding portion of the forceps shown in FIG. 1 is closed.

FIG. 4 is a partial cross-sectional view of the vicinity of a link mechanism in a state where a holding portion of the forceps shown in FIG. 1 is open.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Forceps 2 Operation part 21 Operation ring 22 Slider 3 Flexible part 31 Sheath 32 Wire 4 Nipping part 41 Nipping cup 42 Nipping cup 43 Pin 5 Coating layer 6 Link mechanism part 61 Link 62 Link 63 Pin 64 Pin 65 Pin

Claims (12)

[Claims] 1. A forceps capable of remotely opening and closing a holding portion by pulling a wire, wherein at least a part of an outer surface of the wire and / or an inner surface of a member that stores the wire. Characterized in that a coating layer composed of diamond-like carbon (DLC) is formed thereon. 2. A holding section having a link mechanism section, which is opened and closed by operation of the link mechanism section, an operation section for opening and closing the holding section, and provided between the holding section and the operation section. A forceps including a sheath, and a wire that is inserted into the sheath so as to be relatively movable with respect to the sheath, and that connects the link mechanism unit and the operating unit, wherein the outer surface of the wire and / or A forceps, wherein a coating layer made of diamond-like carbon (DLC) is formed on at least a part of the inner surface of the sheath. 3. The forceps according to claim 2, wherein the sheath is flexible and bendable. 4. The forceps according to claim 2, wherein a coating layer made of diamond-like carbon (DLC) is formed on at least a part of an outer surface of the link mechanism. 5. The forceps according to claim 1, wherein the coating layer is formed by a vapor deposition method. 6. The chemical vapor deposition method (CV)
The forceps according to claim 5, which is any method selected from D), sputtering, vacuum deposition, and ion plating. 7. The coating layer has a thickness of 0.05 to 30 μm / h.
The forceps according to any one of claims 1 to 6, wherein the forceps are formed at a film forming speed of: 8. An average thickness of the coating layer is from 0.1 to 10.
The forceps according to any one of claims 1 to 7, wherein the forceps are μm. 9. The forceps according to claim 1, wherein a friction coefficient μ of the coating layer measured by a ball-on-disk method is 0.05 to 0.7. 10. The forceps according to claim 1, wherein the covering layer is formed via a base layer. 11. The base layer is made of W, Cr, Ti, C
The forceps according to claim 10, wherein the forceps is made of a material containing at least one of o, Si, and Al. 12. The forceps according to claim 10, wherein the underlayer is formed by sputtering.