JP2004129747A - Insertion part of endoscope for operation under scopic view - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insertion part of an endoscope for an operation under scopic view capable of securing excellent assemblability and overhaul property by preventing the connection part of a hard insertion tube part and a curved part from being projected so as not to generate a projection when passing it through a trocar and using it and fixing the connection part with a machine screw without sacrificing a space for passing an incorporated material. <P>SOLUTION: A thick part 40b locally expanded inwards is formed at a connection cylinder body 40 and the tip of a hard pipe 21 and the rear end 31a of a curved tube are respectively fixed to the connection cylinder body 40 with the machine screw at the thick part 40b. Also, the rear end part of a curved part coating tube 34 is tightened and fixed to the narrow diameter part 21a of the hard pipe 21 formed locally narrow at a position near a machine screw fixation part, and the connection part of the hard insertion tube part 2 and the curved part 3 is prevented from being projected to the respective surfaces of the hard insertion tube part 2 and the curved part 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an insertion portion of an endoscope for arthroscopic surgery, which is inserted into a body via a trocar inserted into a human body during an operation performed under endoscopic observation.
[0002]
[Prior art]
In the insertion section of the endoscope for arthroscopic surgery, if the insertion section is made of a flexible tube, the insertion section fluctuates in a trocar or the like, which makes it difficult to use. It is easier to use.
[0003]
In order to control the direction of the distal end of the insertion section where the observation window is arranged, a bending section that is bent by remote control is attached to the insertion section of such an endoscope for arthroscopic surgery. The bending portion is covered with an elastic bending portion covering tube.
[0004]
Since a strong pulling force is applied to the end fixing portion of such a curved portion covering tube every time the curved portion is bent, it is necessary to firmly fix and fix the tube. Note that the outer tube of the hard insertion tube portion has little necessity of being tightly fixed because there is almost no stretching force.
[0005]
However, when the end portion of the curved portion covering tube is tightened and fixed, the outer diameter of the connection portion between the hard insertion tube portion and the curved portion locally expands and protrudes, and the portion is caught on the mouth of the trocar or the like. Can be very difficult to use.
[0006]
Therefore, for example, as in a flexible endoscope described in Patent Document 1, a flexible tube and a curved portion are connected and connected by a connection mouth having a small outer diameter, and the narrow diameter portion is covered with a curved portion. It is also conceivable that the tube is tightly fixed so that the connecting portion is not thickened.
[0007]
[Patent Document 1]
JP-A-2-46819, FIG. 1 and the like
[Problems to be solved by the invention]
However, simply connecting and connecting the flexible tube and the curved portion with the connection base having such a small outer diameter simply narrows the inside diameter of the connection base and narrows the space for passing a built-in component such as an optical fiber bundle. I will.
[0009]
In particular, if you try to secure the screw allowance for screw fixing to the connection base in consideration of the assemblability and disassembly maintenance of the connection connection part, the internal space is further restricted, so the connection connection part must be fixed. It must be performed by soldering or the like, which significantly deteriorates the assemblability and disassembly and maintenance.
[0010]
Therefore, the present invention prevents the connection portion between the rigid insertion tube portion and the curved portion from protruding so as not to be caught when used through the trocar, and without sacrificing the space for passing the built-in material. An object of the present invention is to provide an insertion portion of an endoscope for arthroscopic surgery in which a connection connection portion is screwed and fixed to thereby ensure excellent assembling and disassembly and maintenance.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the insertion portion of the endoscope for arthroscopic surgery of the present invention includes a hard insertion tube portion formed by covering an outer tube with a hard pipe, and a curved tube bent by remote control. The curved portion covered with the elastic curved portion coating tube was connected and connected via a connection cylinder disposed over the inside of the distal end portion of the hard pipe and the inside of the rear end portion of the curved tube. In the insertion portion of the endoscope for arthroscopic surgery, a thick portion locally bulging inward is formed in the connecting cylinder, and the tip of the hard pipe and the curved portion are bent with respect to the connecting cylinder in the thick portion. The rear end of the pipe is screwed and fixed, respectively, and the outer diameter of the hard pipe is locally thinned at a position near the screwed fixing portion, and the rear end of the curved portion covering tube is tightened to the narrow diameter portion. Fix the surface of the connecting part between the rigid insertion tube and the curved part. Those constructed as does not project with respect to each surface quality insertion tube portion and a curved portion.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
FIG. 4 shows an endoscope for arthroscopic surgery. A bending section 3 which is bent by remote operation from the operation section 1 is provided at a distal end of a hard insertion tube section 2 whose base end is connected to the operation section 1. Are connected to each other, and the distal end main body 4 on which the observation window and the like are arranged is connected to the distal end of the curved portion 3.
[0013]
The bending portion 3 is bent in a predetermined direction as shown by a two-dot chain line by rotating the bending operation lever 11 arranged on the operation portion 1. In this embodiment, the bending directions are two upward and downward directions. Note that the up-down direction of the curved portion 3 is the up-down direction in the observation visual field, and the same applies hereinafter.
[0014]
FIG. 5 shows the distal end surface of the distal end portion main body 4. In addition to the observation window 5 for capturing the subject image, an illumination window 6 for illuminating the subject, and a treatment tool projection for projecting the treatment tool. The mouth 7 is arranged.
[0015]
FIG. 6 shows the entire structure of the insertion section constituted by the rigid insertion tube section 2, the bending section 3, and the tip section main body 4. The rigid insertion tube section 2 and the bending section 3 are shown in a side cross section. The main body 4 is illustrated in a cross section (a cross section in a direction inclined by about 45 ° with respect to a side cross section) passing through the centers of the observation window 5 and the treatment tool outlet 7. Various built-in components such as optical fiber bundles are not shown.
[0016]
As shown in FIG. 7 illustrating a VII-VII cross section, the hard insertion pipe portion 2 is, for example, a hard pipe 21 made of a single straight stainless steel pipe or the like having a circular cross section, and a hard resin pipe 21 made of, for example, a polyurethane resin tube or the like. The outer tube 22 made of such a flexible tube is covered.
[0017]
7, reference numeral 50 denotes an image signal cable, 60 denotes a light guide fiber bundle, and 70 denotes various internal components such as a treatment instrument insertion channel tube. Reference numeral 23 denotes a guide pipe inserted through the entire length of the hard insertion tube 2 so as to guide an operation wire 33 described later, and is formed of a stainless steel pipe or a hard tetrafluoroethylene resin pipe.
[0018]
Returning to FIG. 6, the skeleton of the curved portion 3 turns a plurality of (for example, about 5 to 20) articulating rings 31 by rivets 32 at the left and right positions as shown in FIG. 8 showing a VIII-VIII cross section. It is formed by a curved tube movably connected.
[0019]
The distal ends of the pair of operation wires 33 arranged at each position in the vertical direction are fixed to the foremost node ring 31, and the outer surface of the curved portion 3 is made of a highly elastic tube material such as a rubber tube. Is covered with a curved portion covering tube 34. Each operation wire 33 is guided in the bending portion 3 through a guide ring 35 attached to the inner circumferential surface of each node ring 31 in the vertical direction.
[0020]
The hard insertion tube portion 2 and the bending portion 3 are made of a metal connection disposed over the inside of the front end portion of the hard pipe 21 of the hard insertion tube portion 2 and the inside of the rearmost node ring 31a of the bending portion 3. They are connected and connected via a cylinder 40.
[0021]
FIG. 1 illustrates a connecting portion between the hard insertion tube portion 2 and the bending portion 3. However, the cross-sectional direction is different from that of FIG. 6 by 90 °, and the operation wire 33 positioned in the vertical direction is illustrated in a state passing through the center.
[0022]
Although the connecting cylinder 40 is thin and substantially cylindrical as a whole, it is shown in FIGS. 2 and 3 showing II-II section and III-III section at a position near the front end and a position near the middle of the connecting cylinder 40. As shown in the figure, the connecting cylinder 40 has a thick portion 40b bulging inward only in the left-right direction, and a screw hole for screwing the fixing screws 41 and 42 is formed in the thick portion. 40b.
[0023]
Therefore, a space for inserting and placing various built-in components is secured inside the connection cylinder 40. Reference numeral 40a denotes a notch formed in the connecting cylinder 40 in order to avoid interference with the guide ring 35 at the rear end in the curved portion 3, and the distal end portion of the guide pipe 23 of the hard insertion tube 2 is connected to the connecting cylinder. 40 is fixed to the inner peripheral surface.
[0024]
The connecting cylinder 40 has a rear half fitted and disposed within the distal end of the hard pipe 21 of the hard insertion tube part 2 and fixed to the hard pipe 21 from the left and right by a pair of fixing screws 41. It is fitted into the end node ring 31a and is fixed to the rearmost node ring 31a by a pair of fixing screws 42 from the left and right. Therefore, assembly, disassembly, and maintenance of this part are easy.
[0025]
The rear end portion of the curved portion covering tube 34 that covers the curved portion 3 is disposed so as to cover the fixing screws 41 and 42 of the connection portion between the rigid insertion tube portion 2 and the curved portion 3 configured as described above. Thus, the rigid insertion tube portion 2 is fixedly fastened to the outer peripheral surface near the tip of the hard pipe 21.
[0026]
In the hard pipe 21, a small-diameter portion 21a having a locally small outer diameter is formed in a circumferential groove shape at a rear position in the vicinity of a fixing screw 41 for fixing with the connecting cylinder 40, and the curved portion 3 is formed. The rear end portion of the curved portion covering tube 34 is tightly fixed to the small diameter portion 21a by a tightening thread 45 (furthermore, an adhesive is applied as necessary).
[0027]
Therefore, the surface of the binding portion does not protrude from the surface of the outer tube 22 of the hard insertion tube portion 2 or the surface of the curved portion covering tube 34 of the curved portion 3, and the inserted portion is smoothly inserted into the trocar (not shown) without being caught. Can be removed.
[0028]
【The invention's effect】
According to the present invention, a thick wall portion locally bulging inward is formed in the connection cylinder, and the tip of the hard pipe of the hard insertion pipe portion and the curved pipe are formed with respect to the connection cylinder body in the thick wall portion. By fixing the rear end with each screw, excellent assembling and disassembly maintenance can be ensured without sacrificing the space for passing the built-in components, and at the position near the screw fixing part. The outer diameter of the hard pipe is locally thinned, and the rear end of the curved portion covering tube is tightly fixed to the small diameter portion, and the surface of the connection portion between the hard insertion tube portion and the curved portion is a hard insertion tube. Since it does not protrude from each surface of the portion and the curved portion, the trocar can be smoothly inserted and removed without being caught on the trocar.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a connection connecting portion between a hard insertion tube portion and a bending portion of an insertion portion of an endoscope for arthroscopic surgery according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along the line II-II in FIG. 1 of an insertion portion of the endoscope for arthroscopic surgery according to the embodiment of the present invention.
FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 of an insertion portion of the endoscope for arthroscopic surgery according to the embodiment of the present invention.
FIG. 4 is a side view showing the external appearance of the entire configuration of the endoscope for arthroscopic surgery according to the embodiment of the present invention.
FIG. 5 is an external view of a distal end face of an insertion portion of the endoscope for arthroscopic surgery according to the embodiment of the present invention.
FIG. 6 is a side sectional view of an insertion portion of the endoscope for arthroscopic surgery according to the embodiment of the present invention.
FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6 of an insertion portion of the endoscope for arthroscopic surgery according to the embodiment of the present invention.
FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 6 of an insertion portion of the endoscope for arthroscopic surgery according to the embodiment of the present invention.
[Explanation of symbols]
2 Hard insertion tube part 3 Curved part 21 Hard pipe 21a Small diameter part 22 Exterior tube 31 Section ring (curved pipe)
31a Last node ring 32 Rivet (bent tube)
34 Curved portion coating tube 40 Connection cylindrical body 40b Thick portions 41, 42 Fixing screw 45 Binding thread

Claims (1)

A hard insertion pipe portion formed by coating a hard pipe with an outer tube, and a bending portion formed by coating a resilient bending portion coating tube on a bending tube that bends by remote control, at a tip portion of the hard pipe. In the insertion portion of the endoscope for arthroscopic surgery connected and connected via a connection cylinder disposed over the inside and the rear end portion of the curved tube,
A thick wall portion locally bulging inward is formed in the connection cylinder body, and the front end of the hard pipe and the rear end of the curved pipe are screwed to the connection cylinder body at the thick wall portion, respectively. While fixing,
The outer diameter of the hard pipe is locally narrowed at a position near the screw fixing portion, and the rear end of the curved portion covering tube is tightly fixed to the small diameter portion,
The endoscope for arthroscopic surgery, wherein a surface of a connection portion between the hard insertion tube portion and the bending portion does not protrude from each surface of the hard insertion tube portion and the bending portion. Insertion part of mirror.

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