JP3033065B2 - Bending part structure of endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved structure of an endoscope, and more particularly to a curved structure of an endoscope which is inserted into a body percutaneously such as a laparoscope.

[0002]

2. Description of the Related Art Conventionally, a bending portion of an endoscope is constituted by a plurality of angle rings rotatably connected to each other with pins to form a ring structure, and a stainless steel protection net is provided on the ring structure. At the same time, the protective net is provided with an outer layer made of rubber or polyurethane.

In order to use the endoscope configured as described above, first, the inner needle of the trocar is inserted into the mantle tube and pierced from the body skin in a connected state, and a body cavity for observation, treatment, or the like is performed. Then, the inner needle is pulled out, and the inner needle is withdrawn. Then, the inner needle is sequentially inserted into the outer tube from the distal end of the endoscope. Then, the tip portion is directed in a desired direction by the above-mentioned curved portion. However, the distal end of the mantle tube is formed as sharp as a blade to easily insert the trocar into the body. Therefore, if the bending portion is in a curved state when the endoscope is pulled out from the mantle tube, there is a disadvantage that the bending portion is shaved at the distal end of the mantle tube and the skin layer is damaged. When the damaged portion of the outer skin layer reaches the protective net, a body fluid or the like passes through the protective net and enters the curved portion due to a pressure difference between the body cavity and the curved portion, adversely affecting the optical system provided at the distal end portion. There is a disadvantage of giving.

In order to solve such a problem, a guide tube is inserted into the outer tube of a trocar as disclosed in Japanese Patent Application Laid-Open No. 2-206422 filed by the present applicant. . The guide tube has a distal end projecting beyond the distal end of the mantle tube, and the distal end is rounded so as not to damage the outer skin layer of the curved portion.

[0005]

However, there is no particular problem if the guide tube disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2-206422 is used, but it is generally used in combination with a commercially available trocar having a sharp tip. However, if the bending portion of the endoscope is pulled out in a curved state, the outer skin layer is damaged at the distal end of the guide tube, and there is a disadvantage that body fluids and the like pass through the protection net and enter the bending portion.

The present invention has been made in view of such circumstances, and has a curved portion structure of an endoscope which can prevent body fluids and the like from entering the curved portion even when the trocar contacts the curved portion. The purpose is to provide.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to prevent a curved portion connected to a hand operating portion of an endoscope via a hard portion of an insertion portion from being damaged by a trocar. In the curved portion structure, a protective net is attached to a ring structure formed by rotatably connecting a plurality of angle rings, and an outer layer made of an elastic material is externally provided on the protective net, and the outer layer is formed of an elastic material. The outside is further covered with a metallic protection net, and the outside of the protection net is covered with a skin layer.

[0008]

According to the present invention, the outer skin layer of the bending portion of the endoscope is
Cover metal protective net. Thereby, even if the curved portion comes into contact with the trocar when the endoscope is pulled out, the protective net comes into contact with the trocar, so that the outer skin layer is not damaged. Therefore, it is possible to reliably prevent body fluid and the like from entering the curved portion.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an endoscope according to a preferred embodiment of the present invention; FIG. 1 shows an endoscope 1 to which a bending portion structure of an endoscope according to the present invention is applied.
0, the endoscope 10 is provided with the operation unit 1 at hand.
The insertion part 14 is connected to 2. This insertion portion 14
A predetermined length from the connection portion to the hand operation portion 12 is a hard portion 16 made of a hard pipe material, and a bending portion 18 is connected to the hard portion 16. The distal end hard portion 20 is connected to the curved portion 18.

As shown in FIGS. 2 and 3, a plurality of angle rings 22, 22,... Are connected to each other by pins 23 so as to be rotatable. A protection net 26 made of stainless steel is attached to the entire periphery of the ring structure 24. Further, an outer skin layer 28 made of rubber or polyurethane is applied to the entire periphery of the protection net 26.

A protective net 30 made of stainless steel is attached to the entire outer periphery of the outer skin layer 28. An outer skin layer 32 of the same material as the above-mentioned outer skin layer 28 is applied to the entire periphery of the protective net 30. The outer skin layer 32 is tied at its both ends with strings 34
Is adhered to. In FIG. 2, reference numeral 20a denotes an objective optical system, 20b denotes a light guide, and 20c denotes a forceps channel.

Next, the operation of the endoscope configured as described above will be described with reference to FIG. FIG. 4 shows a state in which a guide tube 38 having a rounded tip is fitted into a trocar 36 inserted into the body, and the insertion portion 14 of the endoscope 10 is inserted into the guide tube 38. Have been. .

When the insertion portion 14 of the endoscope 10 thus inserted is pulled out from the guide tube 38, if the bending portion 18 is in a bent state as shown in the drawing, the bending portion 18 has a substantially central portion at the guide tube 38. Abuts against the rounded tip portion 40.
At this time, the outer skin layer 32 of the curved portion 18 is shaved by the distal end portion 40 of the guide tube 38, but since the protection net 30 is attached to the lower layer of the skin layer 32, the damaged portion is formed by the lower layer of the protection net 30. To reach the outer skin layer 28.

Therefore, in the present embodiment, as compared with the curved portion of the conventional endoscope, the protection net and the outer skin layer are doubly laminated, and even if the outer skin layer 32 is damaged, the inner outer skin layer 28 is formed. Since no damage is caused, it is possible to reliably prevent body fluids and the like from entering the curved tube 18. In this embodiment, the protective net and the outer skin layer are double-laminated, but the present invention is not limited to this.
8, the same effect as in the present embodiment can be obtained.

[0015]

As described above, according to the structure of the curved portion of the endoscope according to the present invention, the ring structure constituting the curved portion of the endoscope is covered with the protective net and the outer layer, and Since the outer side of the skin layer was further covered with a metallic protective net and an outer skin layer, even if the curved portion came into contact with the trocar and the outer skin layer was damaged, the inner outer skin layer was formed by the action of the metal protective net. It is possible to reliably prevent body fluid and the like from entering the curved portion without being damaged. Further, since the outer side of the curved portion of the endoscope is covered with the outer skin layer, the adhesion to the trocar is improved, and an excellent effect that air in the body cavity does not leak is exhibited.

[Brief description of the drawings]

FIG. 1 is an overall view showing an embodiment of an endoscope.

FIG. 2 is a sectional view showing an embodiment of a bending portion structure of the endoscope according to the present invention.

FIG. 3 is a sectional view showing an embodiment of a bending portion structure of the endoscope according to the present invention.

FIG. 4 is an explanatory view showing a state in which the bending portion of the endoscope according to the present invention is inserted into the trocar;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Endoscope 18 ... Bending part 22 ... Angle ring 26, 30 ... Protection net 28, 32 ... Outer skin layer

Claims (1)

(57) [Claims] 1. A hard part of an insertion part is provided at a hand operation part of an endoscope.
To prevent curved parts connected through the trocar from being damaged.
In the curved portion structure for locking, while depositing protective net multiple angle rings in the ring structure formed by pivotally connected, to the exterior of the outer skin layer of resilient material to the protective net, the Extra metallic protection on the outside of the skin
And a cover layer on the outside of the protective net.
A curved portion structure of an endoscope, wherein the curved portion structure is covered with a.