JPS649014B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a lifting device for a treatment tool such as forceps in an endoscope. [Prior Art] In general, medical endoscopes such as colon fiberscopes, gastrophic fiberscopes, and bronchial fiberscopes are used to observe the affected area by inserting their flexible body cavity insertion parts into the patient's body cavity. and other treatments. An example of the configuration of such an endoscope is shown in FIG. That is, as shown in the figure, the endoscope 1 includes an operating section main body 2 for operating various members, an illumination window for the illumination optical system, an observation window for the observation optical system (none of which are shown), and a section for moving in and out the forceps. It is composed of a distal end 5 having an opening 6 and the like, and a long flexible section 3 and a curved section 4 connected between the distal end 5 and the operating section main body 2. The operation section main body 2 includes an eyepiece section 7, an angle knob 8 for operating a curved section, an insertion port 9 for a treatment instrument such as forceps, an operation knob 10 for raising a treatment instrument such as forceps, an air supply/water supply button 11, A suction button 12 and the like are provided. The endoscope 1 configured in this way has its body cavity insertion section consisting of the distal end section 5, the curved section 4, and the flexible section 3 inserted into the patient's body cavity, and the distal end section is inserted by operating the angle knob 8. Curved part 4 so that 5 faces the affected area.
This is a curving operation. When using a treatment tool 13 such as forceps, the treatment tool 13 is inserted into the treatment tool channel through the treatment tool insertion opening 9 provided in the operation section main body 2, and the treatment tool 13 is inserted into the treatment tool channel through the treatment tool insertion opening 9 in the distal end portion 5. By operating the operation knob 10 for raising the treatment instrument protruding from the operation section body 2 and provided on the operation section main body 2, the operation wire 14 interlocked with this knob 10 is used to open the opening 6 of the distal end portion 5 for raising the treatment instrument. A treatment instrument raising stand 15 placed in
is rotated around the pivot pin 16 to direct the treatment instrument 13 in contact with the treatment instrument raising stand 15 toward the affected area. By the way, the connecting portion between the conventional treatment instrument raising table 15 for bending the treatment instrument 13 such as forceps and the operation wire 14 for operating the raising table 15 is constructed as shown in FIGS. 2A and 2B. ing. That is,
A socket holder 17 is fixed to the tip of the operating wire 14 by silver brazing, and the operating wire 14
is inserted into the stepped through hole 18 provided in the treatment instrument raising table 15, the socket metal 17 is locked to the stepped part, the tip of the operating wire 14 is connected to the treatment instrument raising table 15, and the operating wire is inserted into the stepped through hole 18 provided in the treatment instrument raising table 15. 14 is bent at a right angle and led out from the stepped through hole 18. Then, by pushing and pulling the operation wire 14, the socket 1
7 is configured to rotate within the stepped through hole 18 to raise and lower the treatment instrument raising table 15 . [Problems to be Solved by the Invention] However, the structure of the socket 17 portion silver-brazed to the operating wire 14 for operating the treatment instrument elevator 15 has many drawbacks as described below. In other words, (1) The silver solder used for brazing is mainly composed of a Cu-Zn-Ag alloy, to which Cd, Ni, Sn, Li, etc. are added. Cu, Zn, etc. are not durable against chemical liquids, especially iodine-based chemical liquids that are frequently used for disinfecting and sterilizing medical endoscopes, so they deteriorate. In addition, there is a risk that Cu may generate basic copper hydroxide (patina). (2) The operating wire 14 at the portion to which the socket metal is fixed becomes dull due to heating during silver brazing, and the tensile strength of the operating wire itself decreases. (3) There is a risk that flux such as strong acid used during silver brazing will penetrate into the strands of the operating wire 14 made of stainless steel or the like, corroding the operating wire 14, and causing it to break. There are drawbacks such as. The present invention was made in order to eliminate such drawbacks in the conventional treatment instrument lifting device for an endoscope.
The object of the present invention is to provide an endoscope treatment instrument lifting device that has stable and strong tensile strength and resistance to chemical liquids. [Means and effects for solving the problem] In order to solve the above-mentioned problems, the present invention provides a treatment tool that is arranged in an opening for entering and exiting the treatment tool at the distal end of the endoscope so as to be able to rise and fall. In an endoscope treatment instrument lifting device comprising a lifting table that defines a height and an operating wire for raising and lowering the lifting table, an uneven rough surface part is formed on the outer periphery of an end of the operating wire, and the uneven rough surface part A socket metal crimped and fixed by plastic deformation through an adhesive is engaged with a stepped portion of a stepped through hole provided in the hoisting base, thereby connecting the operating wire and the hoisting base. It is something. With this configuration, the inner circumferential surface of the socket to be crimped and fixed bites into the uneven rough surface of the operating wire, and is firmly connected by the uneven engagement.
Due to the increased adhesive effect of the adhesive interposed between the contact surfaces due to the uneven engagement, the operating wire and the socket are firmly fixed. Furthermore, since the adhesive interposed on the fixing surface permeates into the operating wire, it is possible to prevent chemicals and the like from entering the operating wire, and to protect the crimp-fixed portion that is subject to tensile stress. In addition, since the uneven rough surface portion is formed, it is possible to effectively prevent the occurrence of misalignment of the socket plate when simply press-fixing with an adhesive. [Examples] The present invention will be explained in detail based on Examples below. FIG. 3 is an enlarged view of a main part of an embodiment of an endoscope treatment tool lifting device according to the present invention, and FIG. 4 is a sectional view thereof. In FIG. 3, reference numeral 21 denotes an operating wire made of stranded wire of stainless steel, etc., and an uneven rough surface portion 22 is formed on the tip surface of the wire by sandblasting or the like in advance.
A plastically deformable cylindrical socket holder 23 having an inner diameter slightly larger than the outer diameter of the operating wire 21 is inserted through the adhesive 26, and the outer periphery of the socket holder 23 is swathed or drawn. It is then plastically deformed and fixed by pressure, thereby forming an engaging portion for the stepped portion of the stepped through hole 25 of the treatment instrument raising table 24. By forming the uneven rough surface part 22 on the surface of the tip end of the operating wire in this way, the inner circumferential surface of the socket holder 23 to be crimped and fixed bites into the uneven rough surface part 22 of the operating wire 21, and the socket holder 23 is mechanically Since it is fixedly connected to the operating wire by a convex-concave engagement, it exhibits greater tensile strength than simply crimping and fixing. Furthermore, since the socket holder 23 is crimped through the adhesive 26 and the adhesive 26 is hardened and fixed, the coupling effect due to the socket holder 23 biting into the uneven rough surface 22 of the operating wire 21 will prevent the gap between them. The adhesive effect of the adhesive 26 interposed between the contact surfaces increased due to the uneven contact of the operation wire 21
and the socket holder 23 can be fixed even more firmly. In addition, since the adhesive 26 is interposed, the fourth
As shown in the figure, an operating wire 21 made of twisted wires
The adhesive 26 penetrates between each of the strands 21', 21', . In addition to stabilizing the tensile strength of the fixed portion between the wire 21 and the socket holder 23, it also prevents strong chemical solutions from penetrating into the wire strands 21', 21',... and reduces tensile stress. The role of protecting the crimped and fixed portion can also be delayed. Furthermore, when simply crimping and fixing the socket by plastic deformation using an adhesive, the fixed parts may move relative to each other due to the viscosity of the adhesive, and the fixed position of the socket and the operating wire may shift. In the present invention, since the uneven rough surface portion 22 is formed on the surface of the operating wire 21, even if an adhesive is used, it is possible to effectively prevent displacement due to the viscosity of the adhesive during crimping and fixing, and to ensure accurate Positioning and fixing can be performed. Next, the surface of the tip of the operating wire with an outer diameter of 0.6 mm formed by twisting 7 stainless steel wires is sandblasted with Alundum No. 30 to form an uneven rough surface. A plastic deformation process in which a chemical-resistant adhesive is applied, a stainless steel socket with an inner diameter of 0.65 mm, an outer diameter of 2.3 mm, and a length of 23 mm is inserted, and the socket is squeezed to an outer diameter of 2.2 mm. Table 1 shows experimental data on the tensile strength of the connection portion of the operating wire formed by applying the above method. In order to compare this, we will introduce an operating wire formed by crimping and fixing a socket without forming an uneven rough surface on the wire surface and without using an adhesive, and a control wire formed by forming an uneven rough surface on the wire surface and using an adhesive. Table 1 also shows experimental data on the tensile strength of each connection part of the operating wire formed by crimping and fixing the socket head.

【table】

〔Effect of the invention〕

As described above based on the embodiments, the present invention forms an uneven rough surface part on the outer periphery of the end of the operating wire, and a socket metal which is crimped and fixed to the uneven rough surface part by plastic deformation via an adhesive is placed on an elevator. The operation wire is connected to the step part of the stepped through-hole provided in the endoscope, and the operation wire and the elevator are connected to form a device for raising the treatment instrument of the endoscope. The bonded part between the wire and the socket piece will not deteriorate due to chemicals, etc., and the tensile strength can be increased and stabilized.
Since flux is not used, it is possible to prevent a decrease in tensile strength and corrosion of the operating wire. In addition, since a rough surface is formed on the outer periphery of the end of the operating wire and the socket piece is crimped and fixed, the tensile strength can be further increased, and the socket piece is also crimped using an adhesive. Since it is fixed, not only can the tensile strength be further increased, but it also prevents chemical liquid from penetrating into the operating wire, protects the crimped fixing part that is subject to tensile stress, and can be used for a long period of time. A predetermined tensile strength can be maintained. In addition, the cooperative action of the uneven rough surface portion and the adhesive prevents displacement due to the viscosity of the adhesive during crimping and fixing, and provides effects such as accurate positioning and fixation.

[Brief explanation of drawings]

FIG. 1 is an external view of an example of the configuration of a conventional endoscope;
FIG. 2A is a schematic diagram showing a conventional treatment tool lifting device for an endoscope, FIG. 2B is an enlarged sectional view of the main part of FIG. 2A, and FIG. FIG. 4 is an enlarged sectional view of a main part of an embodiment of a mirror treatment instrument lifting device.
FIG. 4 is a cross-sectional view of the fixed portion of the socket plate and the operating wire in FIG. 3; In the figure, 1 is an endoscope, 2 is the operation unit main body, and 3 is an endoscope.
4 is a flexible part, 4 is a curved part, 5 is a tip part, 6 is an opening for entering and exiting a treatment instrument, 13 is a treatment instrument, 14 is an operating wire,
Reference numeral 15 refers to a treatment instrument raising stand, 16 refers to a pivot pin, 17 refers to a socket, 18 refers to a stepped through hole, 21 refers to an operating wire, 2
Reference numeral 2 indicates an uneven rough surface portion, 23 indicates a socket, 24 indicates a treatment instrument raising stand, 25 indicates a stepped through hole, and 26 indicates an adhesive.

Claims (1)

[Claims] 1. An endoscope equipped with an elevator that determines the direction in which the treatment instrument is led out, which is arranged to be able to be raised and lowered in the opening for entering and exiting the treatment instrument at the distal end of the endoscope, and an operating wire that operates the elevator to raise and lower the elevator. In the mirror treatment instrument lifting device, an uneven rough surface is formed on the outer periphery of the end of the operating wire, and a socket metal holder is provided on the lifting table, the socket being crimped and fixed to the uneven rough surface through adhesive by plastic deformation. A treatment tool lifting device for an endoscope, characterized in that the operating wire and the lifting table are connected by being locked to a stepped portion of a stepped through hole.